JP2015047054A - Rotor, stator, and motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotor, a stator, and a motor capable of reducing the roughness and denseness of a magnetic flux density of a claw-like magnetic pole.SOLUTION: A single rotor 1a is formed by sequentially laminating first to fourth rotor cores 10, 20, 30, and 40 in an axial direction while interposing first to fourth field magnets 51-54. Front end surfaces 16 and 36 of first and third rotor side claw-like magnetic poles 13 and 33 are made abut on each other in an axial line direction, and front end surfaces 26 and 46 of second and fourth rotor side claw-like magnetic poles 23 and 43 are made abut on each other in the axial line direction. A single stator 2a is formed by sequentially laminating first to fourth stator cores 60, 70, 80, and 90 in the axial direction while interposing first to fourth annular coils. Front end surfaces 67 and 87 of first and third stator side claw-like magnetic poles 64 and 84 are made abut on each other in the axial line direction, and front end surfaces 77 and 97 of second and fourth stator side claw-like magnetic poles 74 and 94 are made abut on each other in the axial line direction.

Description

  The present invention relates to a rotor, a stator, and a motor.

  As a rotor used in a motor, a rotor core having a plurality of claw-shaped magnetic poles on the outer periphery of a disk-shaped core base is used as a pair, and the claw-shaped magnetic poles of the pair of rotor cores are combined in an alternating manner in the circumferential direction. A so-called Landel-type rotor is known in which field magnets are arranged between the pair of rotor cores (core bases) in the axial direction so that the claw-shaped magnetic poles function alternately as NS magnetic poles. For example, the Landel-type rotor disclosed in Patent Document 1 has a two-stage structure using two pairs of rotor cores and field magnets.

Japanese Utility Model Publication No. 5-43749

  By the way, the rotor having the above-mentioned Landell structure has a structure in which the tips of the claw-shaped magnetic poles extending in the axial direction are opened. For this reason, the magnetic flux density at the base end portion of the claw-shaped magnetic pole is dense, whereas the magnetic flux density at the open end of the claw-shaped magnetic pole is sparse, and the magnetic flux density varies in the axial direction of the claw-shaped magnetic pole. .

Each claw-shaped magnetic pole having a variation in magnetic flux density in the axial direction gives a non-uniform magnetic flux in the axial direction to the magnetic pole of the stator, leading to a decrease in the output of the motor.
The same applies to the stator of the Landell type structure, and since the tips of the claw-shaped magnetic poles of the stator are open, the claw-shaped magnetic poles of the stator are not uniform in the axial direction with respect to the magnetic poles of the rotor. Magnetic flux density was given, leading to a decrease in motor output.

  The present invention has been made to solve the above-described problems, and an object thereof is to provide a rotor, a stator, and a motor that can reduce the density of magnetic flux density in the axial direction of the claw-shaped magnetic poles. It is in.

  A rotor that solves the above-mentioned problems is formed by laminating four first to fourth rotor cores, each having the same number of rotor-side claw-shaped magnetic poles extending at equal angular intervals, with a field magnet interposed in order in the axial direction. The front end surface of the first rotor-side claw-shaped magnetic pole formed on the first rotor core and the front end surface of the third rotor-side claw-shaped magnetic pole formed on the third rotor core are contacted or closely opposed in the axial direction, and the second rotor core The tip surface of the second rotor side claw-shaped magnetic pole formed on the fourth rotor core and the tip surface of the fourth rotor side claw-shaped magnetic pole formed on the fourth rotor core are abutted or closely opposed in the axial direction, and formed on the first and third rotor cores. The first and third rotor side claw-shaped magnetic poles function as the first magnetic pole, and the second and fourth rotor side claw-shaped magnetic poles formed on the second and fourth rotor cores function as the second magnetic pole, Interspersed with each of the first to fourth rotor cores Have been various circles magnet was magnetized in the axial direction.

  According to the above rotor, the first and third rotor side claw-shaped magnetic poles of the first magnetic pole have their tip surfaces abutted or closely opposed in the axial direction, so that they are uniform in the axial direction with respect to the stator. The first magnetic pole has a magnetic flux density distribution. The second and fourth rotor side claw-shaped magnetic poles of the second magnetic pole have their tip surfaces abutted or closely opposed in the axial direction, so that the second magnetic pole that is uniform in the axial direction with respect to the stator. Magnetic flux density distribution. Accordingly, each rotor-side claw-shaped magnetic pole can individually apply a magnetic flux having a uniform magnetic flux density distribution in the axial direction to the opposing stator, and the output can be further increased.

  In the rotor, the field magnet laminated between the first rotor core and the second rotor core has a first magnetic pole magnetized on the first rotor core side in the axial direction and a second magnet on the second rotor core side in the axial direction. The magnetic pole is magnetized, and the field magnet laminated between the second rotor core and the third rotor core has the second magnetic pole magnetized on the second rotor core side in the axial direction, and the third in the axial direction. The first magnetic pole is magnetized on the rotor core side, and the field magnet laminated between the third rotor core and the fourth rotor core is magnetized on the third rotor core side in the axial direction. The second magnetic pole is preferably magnetized on the fourth rotor core side in the axial direction.

  According to the rotor, the first and third rotor side claw-shaped magnetic poles have a uniform magnetic flux density distribution of the first magnetic pole in the axial direction, and the second and fourth rotor side claw-shaped magnetic poles are axially aligned. The magnetic flux density distribution of the second magnetic pole is uniform.

  In the rotor, a field magnet laminated between the first and second rotor cores, a field magnet laminated between the second and third rotor cores, and a lamination between the third and fourth rotor cores. Both of the field magnets thus formed preferably have the same length in the axial direction.

  According to the rotor, the backflow of the magnetic flux based on the difference in generated magnetic flux is suppressed between the front end surfaces of the first and third stator side claw-shaped magnetic poles, and between the front end surfaces of the second and fourth stator side claw-shaped magnetic poles. Suppresses the backflow of magnetic flux based on the difference in generated magnetic flux. As a result, the rotor can provide a magnetic pole having a high magnetic flux density to the opposing stator, and the output can be further increased.

In the rotor, it is preferable that the field magnets having the same length in the axial direction have the same magnetic force.
According to the rotor, the backflow of the magnetic flux based on the difference in generated magnetic flux is suppressed between the front end surfaces of the first and third stator side claw-shaped magnetic poles, and between the front end surfaces of the second and fourth stator side claw-shaped magnetic poles. Suppresses the backflow of magnetic flux based on the difference in generated magnetic flux. As a result, the rotor can provide a magnetic pole having a high magnetic flux density to the opposing stator, and the output can be further increased.

  In the rotor described above, the axial lengths of the first and third rotor-side claw-shaped magnetic poles are different in a range in which front end surfaces thereof are in contact with each other or close to each other in the axial direction. The lengths of the fourth rotor-side claw-shaped magnetic poles in the axial direction are preferably different lengths as long as the front end surfaces are in contact with each other or close to each other in the axial direction.

  According to the rotor, the flow of magnetic flux flowing through the first and third rotor side claw-shaped magnetic poles can be adjusted, and the flow of magnetic flux flowing through the second and fourth rotor side claw-shaped magnetic poles can be adjusted. It is effective to reduce.

  In the rotor described above, the tip surfaces of the first and third rotor side claw-shaped magnetic poles that contact or approach each other in the axial direction are shifted by a certain range in the circumferential direction, and the second and fourth rotor side claws are arranged. It is preferable that the tip surfaces that contact or approach each other in the axial direction of the magnetic poles are arranged so as to be shifted by a certain range in the circumferential direction.

  According to the rotor, the flow of magnetic flux flowing through the first and third rotor side claw-shaped magnetic poles can be adjusted, and the flow of magnetic flux flowing through the second and fourth rotor side claw-shaped magnetic poles can be adjusted. It is effective to reduce.

  The stator that solves the above-mentioned problems is formed by laminating four first to fourth stator cores, each having the same number of stator side claw-shaped magnetic poles extending at equal angular intervals, with an annular winding interposed in order in the axial direction. The front surface of the first stator side claw-shaped magnetic pole formed on the first stator core and the front surface of the third stator side claw-shaped magnetic pole formed on the third stator core are contacted or closely opposed in the axial direction, and the second stator core The tip surface of the second stator side claw-shaped magnetic pole formed on the fourth stator core and the tip surface of the fourth stator side claw-shaped magnetic pole formed on the fourth stator core are contacted or closely opposed in the axial direction to form the first and third stator cores. The fluctuation cycle of the magnetic flux from the first and third stator side claw-shaped magnetic poles and the fluctuation cycle of the magnetic flux from the second and fourth stator side claw-shaped magnetic poles formed on the second and fourth stator cores are 180 degrees out of phase. Slip As was different orientations of the alternating current flowing through each loop windings interposed respectively to the first to fourth stator core.

  According to the above stator, the first and third stator side claw-shaped magnetic poles have their tip surfaces in contact with or close to each other in the axial direction, so that the magnetic flux density distribution is uniform in the axial direction with respect to the rotor. Can provide the magnetic flux. The claw-shaped magnetic poles on the second and fourth stator sides give the magnetic flux having a uniform magnetic flux density distribution in the axial direction to the rotor because both end surfaces thereof are in contact with each other in the axial direction or opposed to each other. be able to.

Accordingly, each claw-shaped magnetic pole on the stator side can individually apply a magnetic flux having a uniform magnetic flux density distribution in the axial direction to the opposing rotors, thereby further increasing the output.
In the stator, the annular winding laminated between the first stator core and the second stator core is wound in a normal winding, and the annular winding laminated between the second stator core and the third stator core is It is preferable that the annular winding wound by reverse winding and laminated between the third stator core and the fourth stator core is wound by forward winding and a single-phase current flows through each annular winding.

  According to the stator, the first and third stator side claw-shaped magnetic poles can give the rotor a magnetic flux having a uniform magnetic flux density distribution in the axial direction, and the second and fourth stator side claw-shaped magnetic poles A magnetic flux having a uniform magnetic flux density distribution in the direction can be applied to the rotor.

  In the stator, an annular winding laminated between the first and second stator cores, an annular winding laminated between the second and third stator cores, and a lamination between the third and fourth stator cores. It is preferable that both of the annular windings have the same coil length.

  According to the stator, the backflow of the magnetic flux based on the difference in the generated magnetic flux is suppressed between the front end surfaces of the first and third stator side claw-shaped magnetic poles, and between the front end surfaces of the second and fourth stator side claw-shaped magnetic poles. Suppresses the backflow of magnetic flux based on the difference in generated magnetic flux. As a result, the stator can apply a rotating magnetic field having a high magnetic flux density to the opposing rotor, and the output can be further increased.

In the stator, it is preferable that each of the annular windings having the same coil length has the same number of turns.
According to the stator, the backflow of the magnetic flux based on the difference in the generated magnetic flux is suppressed between the front end surfaces of the first and third stator side claw-shaped magnetic poles, and between the front end surfaces of the second and fourth stator side claw-shaped magnetic poles. Suppresses the backflow of magnetic flux based on the difference in generated magnetic flux. As a result, the stator can apply a rotating magnetic field having a high magnetic flux density to the opposing rotor, and the output can be further increased.

  In the stator, the axial lengths of the first and third stator side claw-shaped magnetic poles are different in a range in which the front end surfaces are in contact with each other or close to each other in the axial direction. The lengths of the fourth stator side claw-shaped magnetic poles in the axial direction are preferably different in a range in which the end surfaces thereof are in contact with each other or close to each other in the axial direction.

  According to the stator, the flow of the magnetic flux flowing through the first and third stator side claw-shaped magnetic poles can be adjusted and the flow of the magnetic flux flowing through the second and fourth stator side claw-shaped magnetic poles can be adjusted. It is effective to reduce.

  In the stator, the tip surfaces of the first and third stator side claw-shaped magnetic poles that contact or approach each other in the axial direction are shifted by a certain range in the circumferential direction, and the second and fourth stator side claws are arranged. It is preferable that the tip surfaces that contact or approach each other in the axial direction of the magnetic poles are arranged so as to be shifted by a certain range in the circumferential direction.

  According to the stator, the flow of the magnetic flux flowing through the first and third stator side claw-shaped magnetic poles can be adjusted and the flow of the magnetic flux flowing through the second and fourth stator side claw-shaped magnetic poles can be adjusted. It is effective to reduce.

The rotor which solves the said subject laminated | stacked three said rotors on the axial direction, and formed the U-phase rotor, the V-phase rotor, and the W-phase rotor.
According to the rotor, the first and third rotor side claw-shaped magnetic poles and the second and fourth rotor side claw-shaped magnetic poles provided in each phase of the three-phase rotor have a uniform magnetic flux density distribution in the axial direction. The magnetic flux can be individually applied to the opposing stators of each phase.

The stator which solves the said subject laminated | stacked three said stators on the axial direction, and formed the U-phase stator, the V-phase stator, and the W-phase stator.
According to the above stator, the first and third stator side claw-shaped magnetic poles and the second and fourth stator side claw-shaped magnetic poles provided in each phase of the three-phase stator have a uniform magnetic flux density distribution in the axial direction. The magnetic flux can be individually applied to the opposing rotors of each phase.

The motor that solves the above problems has the one rotor and the one stator.
According to the above motor, each rotor-side claw-shaped magnetic pole can individually give a magnetic flux having a uniform magnetic flux density distribution in the axial direction to the opposing stator-side claw-shaped magnetic pole, and each stator-side claw-shaped magnetic pole can The magnetic flux having a uniform magnetic flux density distribution can be individually applied to the opposing claw-shaped magnetic poles on the rotor side.

Therefore, the output of the motor can be increased.
The motor that solves the above problems has the three rotors and the three stators.
According to the motor described above, each rotor-side claw-shaped magnetic pole provided in each phase of the motor individually applies a magnetic flux having a uniform magnetic flux density distribution in the axial direction to the opposing stator-side claw-shaped magnetic pole in the corresponding phase. Can do. Similarly, each stator side claw-shaped magnetic pole provided in each phase of the motor can individually apply magnetic fluxes having a uniform magnetic flux density distribution in the axial direction to the rotor-side claw-shaped magnetic poles of the corresponding phase.

  Therefore, the output of the motor can be increased.

  According to the present invention, the distribution of magnetic flux density in the axial direction of the claw-shaped magnetic pole can be made uniform.

The perspective view of the brushless motor of a 1st embodiment. Similarly, sectional drawing of a brushless motor. Similarly, the perspective view of a single motor. Similarly, the front view seen from the axial direction of the single motor. Similarly, (a) is a cross-sectional view taken along line A-O-A in FIG. 4 of a single rotor, and (b) is a cross-sectional view taken along line A-O-A in FIG. 4 of a single stator. Similarly, the exploded perspective view of a single motor. Similarly, the exploded perspective view of a single rotor. Similarly, the exploded perspective view of a single stator. Similarly, the whole perspective view of the rotor for three phases. Similarly, the front view seen from the radial direction of the rotor for three phases. Similarly, sectional drawing of the rotor for three phases. Similarly, the whole perspective view of the stator for three phases. Similarly, sectional drawing of the stator for three phases. Similarly, the waveform figure of each phase of a three-phase alternating current power supply. The disassembled perspective view of the single motor which comprises the brushless motor of 2nd Embodiment. Similarly, (a) is a sectional view of a single rotor, and (b) is a sectional view of a single stator. Similarly, the whole perspective view of the rotor for three phases. Similarly, the front view seen from the radial direction of the rotor for three phases. Similarly, the whole perspective view of the stator for three phases. Similarly, sectional drawing of the stator for three phases. Similarly, a torque characteristic diagram showing a comparison between current and torque. The disassembled perspective view of the single motor which comprises the brushless motor of 3rd Embodiment. Similarly, (a) is a sectional view of a single rotor, and (b) is a sectional view of a single stator. Similarly, the whole perspective view of the rotor for three phases. Similarly, the front view seen from the radial direction of the rotor for three phases. Similarly, the whole perspective view of the stator for three phases. Similarly, sectional drawing of the stator for three phases. Similarly, a torque characteristic diagram showing a comparison between current and torque. The disassembled perspective view of the single motor which comprises the brushless motor of 4th Embodiment. Similarly, (a) is a sectional view of a single rotor, and (b) is a sectional view of a single stator. Similarly, the whole perspective view of the rotor for three phases. Similarly, the front view seen from the radial direction of the rotor for three phases. Similarly, the whole perspective view of the stator for three phases. Similarly, sectional drawing of the stator for three phases.

(First embodiment)
Hereinafter, a first embodiment of a motor will be described with reference to FIGS.
As shown in FIGS. 1 and 2, the three-phase brushless motor M is a three-phase brushless motor, and is arranged on the rotor 1 fixed to a rotating shaft (not shown) and outside the rotor 1. And an annular stator 2 fixed to a motor housing (not shown).

  As shown in FIGS. 3 to 6, the brushless motor M is a three-phase motor in which a single motor Ma including a single rotor 1 a and a single stator 2 a is stacked in three stages in the axial direction. That is, as shown in FIG. 2, the brushless motor M includes a single motor Ma of the U-phase motor unit Mu, a single motor Ma of the V-phase motor unit Mv, and a single motor of the W-phase motor unit Mw from the top. Ma is laminated in order.

(Rotor 1)
As shown in FIGS. 9 to 11, the rotor 1 is composed of a U-phase rotor 1 u, a V-phase rotor 1 v, and a W-phase rotor 1 w, and in this embodiment, each phase rotor 1 u, 1 v, 1w is formed with the same structure. Here, for convenience of explanation, when the rotors 1u, 1v, 1w of each phase are collectively referred to, they are referred to as a single rotor 1a.

As shown in FIGS. 5A and 7, the single rotor 1 a includes four first to fourth rotor cores 10, 20, 30, and 40 and four first to fourth field magnets 51 to 54. It is configured.
(First rotor core 10)
As shown in FIG. 7, the first rotor core 10 has a first rotor core base 11 formed of a disk-shaped electromagnetic steel plate. A through hole 12 is formed at the center position of the first rotor core base 11 so as to penetrate and fix a rotation shaft (not shown). In addition, twelve first rotor side claw-shaped magnetic poles 13 are formed at equal intervals on the outer peripheral surface of the first rotor core base 11. The twelve first rotor-side claw-shaped magnetic poles 13 project radially outward from the outer peripheral surface of the first rotor core base 11, and have their tips bent to extend toward the second rotor core 20 in the axial direction.

  Both end surfaces in the circumferential direction of the first rotor-side claw-shaped magnetic pole 13 are flat surfaces, and are tapered toward the tip. The radially outer surface and the inner surface of the first rotor-side claw-shaped magnetic pole 13 bent toward the second rotor core 20 in the axial direction are both arcs that are concentric with the central axis O of the rotation shaft (not shown) as the center. Surface. Therefore, the front end surface 16 of the first rotor-side claw-shaped magnetic pole 13 is a flat surface in the direction perpendicular to the axis and is an arc surface curved toward the central axis O when viewed from the axial direction.

  Further, the axial length of the first rotor side claw-shaped magnetic pole 13 (the length from the surface of the first rotor core base 11 on the side opposite to the second rotor core 20 to the front end surface 16) is the thickness of the first rotor core base 11. It is set to 3 times (the length in the axial direction).

  The angle in the circumferential direction of each first rotor-side claw-shaped magnetic pole 13, that is, the angle between the circumferential end surfaces and the central axis O of the rotating shaft (not shown) is the It is set smaller than the angle of the gap between the first rotor side claw-shaped magnetic poles 13.

(Second rotor core 20)
As shown in FIGS. 5A and 7, the second rotor core 20 is arranged in the axial direction with the first rotor core 10 via the first field magnet 51. The second rotor core 20 is made of the same material and shape as the first rotor core 10 and penetrates a rotation shaft (not shown) and is fixed to the center position of the second rotor core base 21 formed in a substantially disc shape. A through hole 22 is formed for this purpose.

  Then, on the outer peripheral surface of the second rotor core base 21, 12 second rotor side claw-shaped magnetic poles 23 are formed at equal intervals, similarly to the first rotor core 10. The twelve second rotor-side claw-shaped magnetic poles 23 project radially outward from the outer peripheral surface of the second rotor core base 21, and have their tips bent to extend toward the third rotor core 30 in the axial direction.

  Both end surfaces in the circumferential direction of the second rotor-side claw-shaped magnetic pole 23 are flat surfaces, and are tapered toward the tip. The radially outer surface and inner surface of the second rotor-side claw-shaped magnetic pole 23 bent toward the axial third rotor core 30 are both arcuate surfaces that are concentric circles centered on the central axis O of the rotating shaft. Therefore, the front end surface 26 of the second rotor-side claw-shaped magnetic pole 23 is a flat surface in the direction perpendicular to the axis, and is an arc surface curved toward the central axis O when viewed from the axial direction.

  The axial length of the second rotor-side claw-shaped magnetic pole 23 (the length from the surface on the side opposite to the third rotor core 30 to the tip surface 26 of the second rotor core base 21) is the thickness of the second rotor core base 21. It is set to 3 times (the length in the axial direction).

  The circumferential angle of each second rotor-side claw-shaped magnetic pole 23, that is, the angle between the circumferential end surfaces and the central axis O of the rotating shaft is determined by the adjacent second rotor-side claw-shaped magnetic pole 23 and the second rotor-side claw. It is set smaller than the angle of the gap between the magnetic poles 23.

  The second rotor core base 21 has 12 second rotor-side claw-shaped magnetic poles 23 between the 12 first rotor-side claw-shaped magnetic poles 13 as viewed in the axial direction with respect to the first rotor core base 11. Relatively located in the middle position.

(Third rotor core 30)
As shown in FIGS. 5A and 7, the third rotor core 30 is disposed in the axial direction with the second rotor core 20 via the second and third field magnets 52 and 53. The third rotor core 30 is made of the same material and the same shape as the first rotor core 10, and penetrates a rotation shaft (not shown) and is fixed to the center position of the third rotor core base 31 formed in a substantially disc shape. A through hole 32 is formed for this purpose.

  Further, twelve third rotor side claw-shaped magnetic poles 33 are formed at equal intervals on the outer peripheral surface of the third rotor core base 31. The twelve third rotor-side claw-shaped magnetic poles 33 protrude radially outward from the outer peripheral surface of the third rotor core base 31, and the tips thereof are bent to extend toward the axial second rotor core 20.

  Both end surfaces in the circumferential direction of the third rotor-side claw-shaped magnetic pole 33 are flat surfaces, and are tapered toward the tip. Both the radially outer surface and the inner surface of the third rotor-side claw-shaped magnetic pole 33 bent toward the axial second rotor core 20 are arcuate surfaces that are concentric circles about the central axis O of the rotating shaft. Therefore, the tip surface 36 of the third rotor-side claw-shaped magnetic pole 33 is a flat surface in the direction perpendicular to the axis, and is an arc surface curved toward the central axis O when viewed from the axial direction.

  Further, the axial length of the third rotor side claw-shaped magnetic pole 33 (the length from the surface of the third rotor core base 31 on the side opposite to the second rotor core 20 to the tip surface 36) is the thickness of the third rotor core base 31. It is set to 3 times (the length in the axial direction).

  The circumferential angle of each third rotor-side claw-shaped magnetic pole 33, that is, the angle between the circumferential end surfaces and the central axis O of the rotation axis is determined by the adjacent third rotor-side claw-shaped magnetic pole 33 and the third rotor-side claw. It is set smaller than the angle of the gap between the magnetic poles 33.

  Further, the third rotor core base 31 includes 12 first rotor-side claw-shaped magnetic poles 13 corresponding to the 12 third rotor-side claw-shaped magnetic poles 33 when viewed from the axial direction with respect to the first rotor core base 11. They are arranged opposite to each other.

  Accordingly, in each pair of the first rotor side claw-shaped magnetic pole 33 and the third rotor side claw-shaped magnetic pole 33 that face each other, the first rotor side claw-shaped magnetic pole 13 and the third rotor side claw-shaped magnetic pole 33 face each other in the axial direction. Bent in the direction. As a result, the front end surface 16 of the first rotor side claw-shaped magnetic pole 13 and the front end surface 36 of the third rotor side claw-shaped magnetic pole 33 are in contact with each other in the axial direction.

(Fourth rotor core 40)
As shown in FIGS. 5A and 7, the fourth rotor core 40 is arranged in the axial direction with the third rotor core 30 via the fourth field magnet 54. The fourth rotor core 40 is made of the same material and shape as the first rotor core 10 and is fixed to the central position of the fourth rotor core base 41 formed in a substantially disc shape through a rotating shaft (not shown). A through hole 42 is formed for this purpose.

  Further, twelve fourth rotor-side claw-shaped magnetic poles 43 are formed at equal intervals on the outer peripheral surface of the fourth rotor core base 41. The twelve fourth rotor-side claw-shaped magnetic poles 43 project radially outward from the outer peripheral surface of the fourth rotor core base 41 and are bent to extend toward the third rotor core 30 in the axial direction.

  Both end surfaces in the circumferential direction of the fourth rotor-side claw-shaped magnetic pole 43 are flat surfaces, and are tapered toward the tip. Both the radially outer surface and the inner surface of the fourth rotor-side claw-shaped magnetic pole 43 bent toward the third rotor core 30 in the axial direction are arcuate surfaces that are concentric circles about the central axis O of the rotation shaft. Therefore, the distal end surface 46 of the fourth rotor-side claw-shaped magnetic pole 43 is a flat surface in the direction perpendicular to the axis and is an arc surface curved toward the central axis O when viewed from the axial direction.

  Further, the axial length of the fourth rotor-side claw-shaped magnetic pole 43 (the length from the surface on the side opposite to the third rotor core 30 to the tip surface 46 of the fourth rotor core base 41) is the thickness of the fourth rotor core base 41. It is set to 3 times (the length in the axial direction).

  The circumferential angle of each fourth rotor-side claw-shaped magnetic pole 43, that is, the angle between the circumferential end surfaces and the central axis O of the rotating shaft is determined by the adjacent fourth rotor-side claw-shaped magnetic pole 43 and the fourth rotor-side claw. It is set smaller than the angle of the gap between the magnetic poles 43.

  The fourth rotor core base 41 has twelve second rotor-side claw-shaped magnetic poles 23 corresponding to the twelve fourth rotor-side claw-shaped magnetic poles 43 when viewed from the axial direction with respect to the second rotor core base 21. They are arranged opposite to each other.

  Therefore, in each pair of the second rotor side claw-shaped magnetic pole 43 and the fourth rotor side claw-shaped magnetic pole 43, the second rotor side claw-shaped magnetic pole 23 and the fourth rotor side claw-shaped magnetic pole 43 face each other in the axial direction. Bent in the direction. As a result, the front end surface 26 of the second rotor side claw-shaped magnetic pole 23 and the front end surface 46 of the fourth rotor side claw-shaped magnetic pole 43 are in contact with each other in the axial direction.

  The first rotor-side claw-shaped magnetic pole 13 and the third rotor-side claw-shaped magnetic pole 33, and the second rotor-side claw-shaped magnetic pole 23 and the fourth rotor-side claw-shaped magnetic pole 43 are divided into the first to fourth rotor cores. The magnetic poles are determined by the first to fourth field magnets 51 to 54 disposed between 10, 20, 30, and 40, respectively.

(First to fourth field magnets 51 to 54)
As shown in FIG. 7, in the present embodiment, the first to fourth field magnets 51 to 54 are each formed of a disk-shaped permanent magnet made of a ferrite magnet, and a rotating shaft (not shown) is located at the center position thereof. Through holes 56 to 59 are formed.

  The outer diameters of the first to fourth field magnets 51 to 54 are set to coincide with the outer diameters of the first to fourth rotor core bases 11, 21, 31 and 41. The plate thicknesses (axial lengths) of the first to fourth field magnets 51 to 54 are the plate thicknesses (axial lengths) of the first to fourth rotor core bases 11, 21, 31, 41, respectively. Is set to match.

  Then, as shown in FIG. 5A and FIG. 7, the first field magnet 51 is stacked between the first rotor core 10 and the second rotor core 20. The second field magnet 52 and the third field magnet 53 are stacked between the second rotor core 20 and the third rotor core 30. The fourth field magnet 54 is stacked between the third rotor core 30 and the fourth rotor core 40.

  As described above, the axial length of the first to fourth rotor-side claw-shaped magnetic poles 13, 23, 33, 43 is set to the thickness of the first to fourth rotor core bases 11, 21, 31, 41 ( 3 times the axial length). Accordingly, when the first to fourth rotor cores 10, 20, 30, and 40 are stacked in the axial direction via the first to fourth field magnets 51, 52, 53, and 54, respectively, the first rotor side claw The tip surface 16 of the magnetic pole 13 and the tip surface 36 of the third rotor side claw-shaped magnetic pole 33 abut each other. Similarly, the tip surface 26 of the second rotor side claw-shaped magnetic pole 23 and the tip surface 46 of the fourth rotor side claw-shaped magnetic pole 43 abut each other.

(First field magnet 51)
The first field magnet 51 is magnetized in the axial direction, and is magnetized so that the first rotor core 10 side is an N pole and the second rotor core 20 side is an S pole. Therefore, the first rotor side claw-shaped magnetic pole 13 of the first rotor core 10 functions as an N pole (first magnetic pole) by the first field magnet 51, and the second rotor-side claw-shaped magnetic pole 23 of the second rotor core 20. Functions as an S pole (second magnetic pole).

(Second field magnet 52)
The second field magnet 52 is magnetized in the axial direction, and is magnetized so that the second rotor core 20 side is an S pole and the third field magnet 53 side is an N pole. Therefore, the second rotor side claw-shaped magnetic pole 23 of the second rotor core 20 functions as an S pole (second magnetic pole) by the second field magnet 52. That is, the second rotor-side claw-shaped magnetic pole 23 of the second rotor core 20 becomes the S pole by the second field magnet 52 and the first field magnet 51.

(Third field magnet 53)
The third field magnet 53 is magnetized in the axial direction, and is magnetized so that the second field magnet 52 side becomes the S pole and the third rotor core 30 side becomes the N pole. Accordingly, the third rotor side claw-shaped magnetic pole 33 of the third rotor core 30 functions as an N pole (first magnetic pole) by the third field magnet 53.

(Fourth field magnet 54)
The fourth field magnet 54 is magnetized in the axial direction, and is magnetized so that the third rotor core 30 side is an N pole and the fourth rotor core 40 side is an S pole. Therefore, the third rotor-side claw-shaped magnetic pole 33 of the third rotor core 30 functions as an N pole (first magnetic pole) by the fourth field magnet 54, and the fourth rotor-side claw-shaped magnetic pole 43 of the fourth rotor core 40. Functions as an S pole (second magnetic pole). That is, the third rotor-side claw-shaped magnetic pole 33 of the third rotor core 30 becomes an N pole by the fourth field magnet 54 and the third field magnet 53.

  In addition, the tip surface 36 of each third rotor-side claw-shaped magnetic pole 33 abuts the tip surface 16 of the corresponding first rotor-side claw-shaped magnetic pole 13 in the axial direction. Each set of the magnetic pole 13 and the third rotor side claw-shaped magnetic pole 33 is an N pole.

  Similarly, the tip surface 46 of each fourth rotor-side claw-shaped magnetic pole 43 abuts the tip surface 26 of the corresponding second rotor-side claw-shaped magnetic pole 23 in the axial direction. Each pair of the magnetic pole 23 and the fourth rotor side claw-shaped magnetic pole 43 is an S pole.

  The single rotor 1a configured as described above has a so-called Landel type structure using four first to fourth rotor cores 10, 20, 30, 40 and four first to fourth field magnets 51 to 54. It becomes a rotor. The single rotor 1a includes a pair of the first rotor-side claw-shaped magnetic pole 13 and the third rotor-side claw-shaped magnetic pole 33 serving as the N pole, the second rotor-side claw-shaped magnetic pole 23 serving as the S pole, and the fourth. The rotor side claw-shaped magnetic poles 43 are alternately arranged in the circumferential direction to form a rotor having 24 magnetic poles (12 pole pairs).

  As shown in FIGS. 9 to 11, this single rotor 1 a is used as a U-phase, V-phase, and W-phase rotor 1 u, 1 v, 1 w, which are laminated in the axial direction to form a three-phase rotor 1. Is formed.

  More specifically, as shown in FIG. 11, the U-phase, V-phase, and W-phase rotors 1u, 1v, and 1w are stacked in this order. The U-phase rotor 1u and the W-phase rotor 1w are arranged such that the arrangement directions of the first to fourth rotor cores 10, 20, 30, 40 (first to fourth field magnets 51 to 54) are the same. Is done.

  On the other hand, as shown in FIG. 11, the V-phase rotor 1v stacked between the U-phase rotor 1u and the W-phase rotor 1w includes the first to fourth rotor cores 10, 20, 30, 40 (first to fourth rotors). The four field magnets 51 to 54) are arranged so that the arrangement directions are opposite to each other.

  That is, the fourth rotor core 40 of the V-phase rotor 1v is in contact with the fourth rotor core 40 of the U-phase rotor 1u, and the first rotor core 10 of the V-phase rotor 1v is in contact with the first rotor core 10 of the W-phase rotor 1w. V-phase rotor 1v is stacked between U-phase rotor 1u and W-phase rotor 1w.

  At this time, as shown in FIG. 10, the three-phase rotor 1 including the U-phase, V-phase, and W-phase rotors 1 u, 1 v, and 1 w includes the U-phase rotor 1 u, the V-phase rotor 1 v, and the W-phase rotor 1 w. The layers are stacked while being shifted by 5 degrees (60 degrees electrical angle).

  More specifically, the V-phase rotor 1v has a mechanical angle of 5 degrees counterclockwise with respect to the U-phase rotor 1u as viewed from the U-phase rotor 1u in the counterclockwise direction (60 degrees in electrical angle). ) It is fixed to the rotating shaft. The W-phase rotor 1w is shifted from the V-phase rotor 1v by a mechanical angle of 5 degrees (60 degrees in electrical angle) in the counterclockwise direction around the central axis O of the rotation axis when viewed from the V-phase rotor 1v. It is fixed to the rotating shaft.

(Stator 2)
As shown in FIGS. 12 and 13, the stator 2 disposed on the outer side in the radial direction of the three-phase rotor 1 is composed of a U-phase stator 2 u, a V-phase stator 2 v, and a W-phase stator 2 w. The stators 2u, 2v, 2w of each phase are configured to be sequentially laminated in the axial direction so as to face the corresponding U-phase rotor 1u, V-phase rotor 1v, and W-phase rotor 1w in the radial direction.

  The stators 2u, 2v, 2w of each phase are formed with the same configuration. Here, for convenience of explanation, the stators 2u, 2v, 2w of each phase are collectively referred to as a single stator 2a.

  As shown in FIGS. 5B and 8, the single stator 2 a includes four first to fourth stator cores 60, 70, 80, 90 and four first to fourth annular windings 101 to 104. It is configured.

(First stator core 60)
As shown in FIG. 8, the first stator core 60 has a first stator core base 61 formed of an annular plate-shaped electromagnetic steel plate. On the outer periphery of the first stator core base 61, a cylindrical first cylindrical wall 62 extends from the surface on the second stator core 70 side of the first stator core base 61 toward the second stator core 70 in the axial direction. It is formed to extend by the plate thickness. The outer peripheral surface of the first cylindrical wall 62 is fixed in contact with an inner surface of a motor housing (not shown). Further, the annular tip surface 63 of the first cylindrical wall 62 is in contact with the second stator core base 71 of the second stator core 70.

  On the other hand, twelve first stator side claw-shaped magnetic poles 64 are formed at equal intervals on the inner peripheral surface of the first stator core base 61. The twelve first stator side claw-shaped magnetic poles 64 are formed to extend from the inner peripheral surface of the first stator core base 61 radially inward and then bend and extend toward the axial second stator core 70 side. .

  Both end surfaces in the circumferential direction of the first stator side claw-shaped magnetic pole 64 are flat surfaces, and are tapered toward the tip. Both the radially outer surface and the inner surface of the first stator side claw-shaped magnetic pole 64 bent toward the axial second stator core 70 are arcuate surfaces that are concentric circles centered on the central axis O of the rotating shaft. Therefore, the front end surface 67 of the first stator side claw-shaped magnetic pole 64 is a flat surface in the direction perpendicular to the axis, and is an arcuate surface curved toward the central axis O when viewed from the axial direction.

  Further, the axial length of the first stator side claw-shaped magnetic pole 64 (the length from the anti-second stator core 70 side surface of the first stator core base 61 to the front end surface 67) is the plate thickness of the first stator core base 61. It is set to 3 times (the length in the axial direction).

  The circumferential angle of each first stator side claw-shaped magnetic pole 64, that is, the angle between the circumferential end surfaces and the central axis O of the rotating shaft is determined by the adjacent first stator side claw-shaped magnetic pole 64 and the first stator side claw. It is set smaller than the angle of the gap between the magnetic poles 64.

(Second stator core 70)
As shown in FIG. 8, the second stator core 70 has a second stator core base 71 having the same material and shape as the first stator core 60 and having an annular plate shape. On the outer periphery of the second stator core base 71, a cylindrical second cylindrical wall 72 extends from the surface of the second stator core base 71 on the third stator core 80 side toward the third stator core 80 in the axial direction. It is formed to extend by the plate thickness. The outer peripheral surface of the second cylindrical wall 72 is fixed in contact with an inner surface of a motor housing (not shown). In addition, the annular tip surface 73 of the second cylindrical wall 72 is in contact with the tip surface 83 of the third cylindrical wall 82 of the third stator core 80.

  On the other hand, twelve second stator side claw-shaped magnetic poles 74 are formed at equal intervals on the inner peripheral surface of the second stator core base 71. The twelve second stator side claw-shaped magnetic poles 74 are formed to extend from the inner peripheral surface of the second stator core base 71 radially inward and then bend and extend toward the axial third stator core 80 side. Yes.

  Both end surfaces in the circumferential direction of the second stator side claw-shaped magnetic pole 74 are flat surfaces, and are tapered toward the tip. The radially outer surface and inner surface of the second stator side claw-shaped magnetic pole 74 bent toward the axial third stator core 80 are both arcuate surfaces that are concentric circles centered on the central axis O of the rotating shaft. Therefore, the tip surface 77 of the second stator side claw-shaped magnetic pole 74 is a flat surface in the direction perpendicular to the axis, and is an arcuate surface curved toward the central axis O when viewed from the axial direction.

  Further, the axial length of the second stator side claw-shaped magnetic pole 74 (the length from the surface on the side opposite to the third stator core 80 to the tip surface 77 of the second stator core base 71) is the plate thickness of the second stator core base 71. It is set to 3 times (the length in the axial direction).

  The circumferential angle of each second stator side claw-shaped magnetic pole 74, that is, the angle between the circumferential end surfaces and the central axis O of the rotating shaft is determined by the adjacent second stator side claw-shaped magnetic pole 74 and second stator side claw. It is set smaller than the angle of the gap between the magnetic poles 74.

  In the second stator core 70, the second stator side claw-shaped magnetic pole 74 of the second stator core 70 is compared with the first stator core 60 in the first stator side claw-shaped magnetic pole 64 of the first stator core 60 when viewed from the axial direction. It is being fixed so that it may be arranged relatively in the middle position.

  Further, since the annular tip surface 63 of the first cylindrical wall 62 formed on the first stator core 60 abuts on the outer periphery of the second stator core base 71 of the second stator core 70, the first stator core base 61 and the second stator core An annular space is formed between the base 71 and the base 71. The first annular winding 101 is wound around the annular space.

(Third stator core 80)
As shown in FIG. 8, the third stator core 80 has the same material and the same shape as the first stator core 60, and has an annular plate-shaped third stator core base 81. On the outer periphery of the third stator core base 81, a cylindrical third cylindrical wall 82 extends from the surface of the third stator core base 81 on the second stator core 70 side toward the second stator core 70 in the axial direction. It is formed to extend by the plate thickness. The outer peripheral surface of the third cylindrical wall 82 is fixed in contact with the inner surface of a motor housing (not shown). The annular tip surface 83 of the third cylindrical wall 82 is in contact with the tip surface 73 of the second cylindrical wall 72 of the second stator core 70 so as to face each other.

  On the other hand, twelve third stator side claw-shaped magnetic poles 84 are formed at equal intervals on the inner peripheral surface of the third stator core base 81. The twelve third stator side claw-shaped magnetic poles 84 are formed to extend from the inner peripheral surface of the third stator core base 81 radially inward and then bend and extend toward the axial second stator core 70 side. Yes.

  Both end surfaces in the circumferential direction of the third stator-side claw-shaped magnetic pole 84 are flat surfaces, and are tapered toward the tip. Both the radially outer side surface and the inner side surface of the third stator side claw-shaped magnetic pole 84 bent toward the axial second stator core 70 are arcuate surfaces that are concentric circles centering on the central axis O of the rotation shaft. Therefore, the tip surface 87 of the third stator side claw-shaped magnetic pole 84 is a flat surface in the direction perpendicular to the axis, and is an arcuate surface curved toward the central axis O when viewed from the axial direction.

  Further, the axial length of the third stator side claw-shaped magnetic pole 84 (the length from the surface on the second stator core 70 side of the third stator core base 81 to the tip surface 87) is the plate thickness of the third stator core base 81. It is set to 3 times (the length in the axial direction).

  The circumferential angle of each third stator side claw-shaped magnetic pole 84, that is, the angle between the circumferential end surfaces and the central axis O of the rotating shaft is determined by the adjacent third stator side claw-shaped magnetic pole 84 and third stator side claw. It is set smaller than the angle of the gap between the magnetic poles 84.

  In the third stator core 80, the first stator side claw-shaped magnetic pole 64 of the first stator core 60 is opposed to the corresponding third stator side claw-shaped magnetic pole 84 when viewed from the axial direction. It is designed to be fixed in place. Then, the front end surface 67 of the first stator side claw-shaped magnetic pole 64 and the front end surface 87 of the third stator side claw-shaped magnetic pole 84 are in contact with each other while facing each other in the axial direction.

  Here, the annular tip surface 73 of the second cylindrical wall 72 and the annular tip surface 83 of the third cylindrical wall 82 abut, and the tip surface 67 of the first stator side claw-shaped magnetic pole 64 and the third stator side claw-shaped magnetic pole 84. Since the front end surface 87 of the first and second stator cores abut, an annular space is formed between the second stator core base 71 and the third stator core base 81. The annular space has an axial length that is twice as long as the axial length of the annular space formed between the first stator core base 61 and the second stator core base 71. This is because the annular space formed between the first stator core base 61 and the second stator core base 71 is determined by the length of the first cylindrical wall 62 in the axial direction, whereas the second stator core base 71 and the second stator core base 71 This is because the annular space formed between the three stator core bases 81 is determined by the axial lengths of the second cylindrical wall 72 and the third cylindrical wall 82.

  In this annular space, the second annular winding 102 is wound and disposed on the second stator core base 71 side, and the third annular winding 103 is wound and disposed on the third stator core base 81 side. It has come to be.

(Fourth stator core 90)
As shown in FIG. 8, the fourth stator core 90 has an annular plate-shaped fourth stator core base 91 that is the same material and the same shape as the first stator core 60. On the outer periphery of the fourth stator core base 91, a cylindrical fourth cylindrical wall 92 extends from the surface of the fourth stator core base 91 on the third stator core 80 side toward the third stator core 80 in the axial direction. It is formed to extend by the plate thickness. The outer peripheral surface of the fourth cylindrical wall 92 is in contact with and fixed to the inner surface of a motor housing (not shown). The annular tip surface 93 of the fourth cylindrical wall 92 is in contact with the third stator core base 81 of the third stator core 80.

  On the other hand, twelve fourth stator side claw-shaped magnetic poles 94 are formed at equal intervals on the inner peripheral surface of the fourth stator core base 91. The twelve fourth stator side claw-shaped magnetic poles 94 are formed to extend from the inner peripheral surface of the fourth stator core base 91 radially inward and then bend and extend toward the axial third stator core 80 side. Yes.

  Both end surfaces in the circumferential direction of the fourth stator side claw-shaped magnetic pole 94 are flat surfaces, and are tapered toward the tip. The radially outer surface and the inner surface of the fourth stator side claw-shaped magnetic pole 94 bent toward the axial third stator core 80 are both arcuate surfaces that are concentric circles about the central axis O of the rotating shaft. Therefore, the front end surface 97 of the fourth stator side claw-shaped magnetic pole 94 is a flat surface in the direction perpendicular to the axis and is an arcuate surface curved toward the central axis O when viewed from the axial direction.

  In addition, the axial length of the fourth stator side claw-shaped magnetic pole 94 (the length from the surface on the side opposite to the third stator core 80 to the tip surface 97 of the fourth stator core base 91) is the plate thickness of the fourth stator core base 91. It is set to 3 times (the length in the axial direction).

  The circumferential angle of each of the fourth stator side claw-shaped magnetic poles 94, that is, the angle between the circumferential end surfaces and the central axis O of the rotating shaft is determined by the adjacent fourth stator side claw-shaped magnetic pole 94 and the fourth stator side claw. It is set smaller than the angle of the gap between the magnetic poles 94.

  In the fourth stator core 90, the second stator side claw-shaped magnetic pole 74 of the second stator core 70 is opposed to the corresponding fourth stator side claw-shaped magnetic pole 94 when viewed from the axial direction. It is designed to be fixed in place. The front end surface 77 of the second stator side claw-shaped magnetic pole 74 and the front end surface 97 of the fourth stator side claw-shaped magnetic pole 94 abut against each other in the axial direction.

  Here, the annular tip end surface 93 of the fourth cylindrical wall 92 formed on the fourth stator core 90 abuts on the outer peripheral portion of the third stator core base 81 of the third stator core 80, so that the third stator core base 81 and the fourth An annular space is formed between the stator core base 91 and the stator core base 91. The fourth annular winding 104 is wound around the annular space.

(First to fourth annular windings 101 to 104)
As shown in FIGS. 5B and 8, the first annular winding 101 is sandwiched between the first stator core base 61 and the second stator core base 71. The second annular winding 102 and the third annular winding 103 are sandwiched between the second stator core base 71 and the third stator core base 81, and the second annular winding 102 is arranged on the second stator core base 71 side with the third annular winding. Winding 103 is arranged on the third stator core base 81 side. The fourth annular winding 104 is sandwiched between the third stator core base 81 and the fourth stator core base 91.

  The first to fourth annular windings 101 to 104 have the same number of turns and are connected in series. The first annular winding 101 and the fourth annular winding 104 are wound in a normal winding. The second annular winding 102 and the third annular winding 103 are wound in a reverse direction with respect to the normal winding of the first annular winding 101 and the fourth annular winding 104.

(First annular winding 101)
As shown in FIGS. 5B and 8, the first annular winding 101 is an annular winding, and is formed in an annular space formed between the first stator core base 61 and the second stator core base 71. Decorated. The outer diameter of the first annular winding 101 is formed substantially the same as the inner diameter of the first cylindrical wall 62, so that the radially outer peripheral surface of the first annular winding 101 contacts the inner peripheral surface of the first cylindrical wall 62. It is arranged. The inner diameter of the first annular winding 101 is formed substantially the same as the outer diameter of the first stator side claw-shaped magnetic pole 64, and the radially inner side surface of the first annular winding 101 is the outer surface of the first stator side claw-shaped magnetic pole 64. It is arrange | positioned so that it may contact | abut.

  Further, the outer surface of the first annular winding 101 in the axial direction and on the first stator core 60 side is in contact with the first stator core base 61, and is in the axial direction of the first annular winding 101 and on the second stator core 70 side. The outer side surface of this is in contact with the second stator core base 71.

The length of the first annular winding 101 in the axial direction is set to match the plate thickness of the first stator core 60 (the length in the axial direction of the first cylindrical wall 62).
(Second annular winding 102)
As shown in FIGS. 5B and 8, the second annular winding 102 is an annular winding and is formed of the same material and the same shape as the first annular winding 101. The second annular winding 102 is housed on the second stator core base 71 side in an annular space formed between the second stator core base 71 and the third stator core base 81.

  The outer diameter of the second annular winding 102 is formed to be substantially the same as the inner diameter of the second cylindrical wall 72, so that the radially outer peripheral surface of the second annular winding 102 contacts the inner peripheral surface of the second cylindrical wall 72. It is arranged. The inner diameter of the second annular winding 102 is formed substantially the same as the outer diameter of the second stator side claw-shaped magnetic pole 74, and the radially inner side surface of the second annular winding 102 is the outer surface of the second stator side claw-shaped magnetic pole 74. It is arrange | positioned so that it may contact | abut.

  The outer surface of the second annular winding 102 on the second stator core 70 side is in contact with the second stator core base 71, and the axial direction of the second annular winding 102 is on the third stator core 80 side. The outer side surface of this is in contact with the third annular winding 103.

The length of the second annular winding 102 in the axial direction is set so as to coincide with the plate thickness of the second stator core 70 (the length in the axial direction of the second cylindrical wall 72).
(Third annular winding 103)
As shown in FIGS. 5B and 8, the third annular winding 103 is an annular winding and is formed of the same material and the same shape as the first annular winding 101. The third annular winding 103 is provided on the third stator core base 81 side in an annular space formed between the second stator core base 71 and the third stator core base 81.

  The outer diameter of the third annular winding 103 is formed to be substantially the same as the inner diameter of the third cylindrical wall 82, so that the radially outer peripheral surface of the third annular winding 103 contacts the inner peripheral surface of the third cylindrical wall 82. It is arranged. The inner diameter of the third annular winding 103 is formed substantially the same as the outer diameter of the third stator side claw-shaped magnetic pole 84, and the radially inner side surface of the third annular winding 103 is the outer surface of the third stator side claw-shaped magnetic pole 84. It is arrange | positioned so that it may contact | abut.

  The outer surface of the third annular winding 103 on the second stator core 70 side is in contact with the second annular winding 102, and the third stator core 80 is in the axial direction of the third annular winding 103. The outer surface of the second abutting portion is in contact with the third stator core base 81.

The axial length of the third annular winding 103 is set to match the plate thickness of the third stator core 80 (the axial length of the third cylindrical wall 82).
(Fourth annular winding 104)
As shown in FIGS. 5B and 8, the fourth annular winding 104 is an annular winding and is formed of the same material and the same shape as the first annular winding 101. The fourth annular winding 104 is housed in an annular space formed between the third stator core base 81 and the fourth stator core base 91.

  The outer diameter of the fourth annular winding 104 is formed to be substantially the same as the inner diameter of the fourth cylindrical wall 92, and the radially outer peripheral surface of the fourth annular winding 104 is in contact with the inner peripheral surface of the fourth cylindrical wall 92. It is arranged. The inner diameter of the fourth annular winding 104 is formed substantially the same as the outer diameter of the fourth stator side claw-shaped magnetic pole 94, and the radially inner side surface of the fourth annular winding 104 is the outer surface of the fourth stator side claw-shaped magnetic pole 94. It is arrange | positioned so that it may contact | abut.

  Further, the outer surface on the third stator core 80 side in the axial direction of the fourth annular winding 104 abuts on the third stator core base 81, and the axial direction of the fourth annular winding 104 in the fourth stator core 90 side. The outer side surface of this is in contact with the fourth stator core base 91.

The length of the fourth annular winding 104 in the axial direction is set to match the plate thickness of the fourth stator core 90 (the length in the axial direction of the fourth cylindrical wall 92).
As described above, the axial length of the first to fourth stator side claw-shaped magnetic poles 64, 74, 84, 94 is set to the thickness of the first to fourth stator core bases 61, 71, 81, 91 ( 3 times the axial length). Thus, when the first to fourth stator cores 60, 70, 80, 90 are laminated in the axial direction via the first to fourth annular windings 101 to 104, respectively, the first stator side claw-shaped magnetic pole 64 is arranged. The distal end surface 67 and the distal end surface 87 of the third stator side claw-shaped magnetic pole 84 abut each other. Similarly, the tip surface 77 of the second stator side claw-shaped magnetic pole 74 and the tip surface 97 of the fourth stator side claw-shaped magnetic pole 94 abut each other.

  As described above, the first and fourth annular windings 101 and 104 are wound in the forward direction, and the second and third annular windings 102 and 103 are wound in the reverse direction. Accordingly, when a current is passed through the first to fourth annular windings 101 to 104 connected in series, the second and third annular windings with respect to the direction of the current flowing through the first and fourth annular windings 101 and 104. The direction of current flowing through the windings 102 and 103 always flows in the opposite direction.

  The first to fourth stator side claw-shaped magnetic poles 64, 74, 84, and 94 are excited to different magnetic poles from time to time by passing a single-phase alternating current through the first to fourth annular windings 101 to 104. To do.

  That is, the front end surface 67 of the first stator side claw-shaped magnetic pole 64 and the corresponding front end surface 87 of the third stator side claw-shaped magnetic pole 84 come into contact with each other, and the magnetic flux density of the magnetic poles fluctuates at the same period. Similarly, the front end surface 77 of the second stator side claw-shaped magnetic pole 74 and the corresponding front end surface 97 of the fourth stator side claw-shaped magnetic pole 94 come into contact with each other, and the magnetic flux density of the magnetic poles fluctuates at the same cycle at the same timing.

  Moreover, the fluctuation period of the magnetic flux density of the first and third stator side claw-shaped magnetic poles 64 and 84 and the fluctuation period of the magnetic flux density of the second and fourth stator side claw-shaped magnetic poles 74 and 94 will be 180 degrees out of phase. It has become.

  The single stator 2 a configured as described above includes the first stator side claw-shaped magnetic pole 64 by the first to fourth stator cores 60, 70, 80, 90 and the first to fourth annular windings 101 to 104. And the third stator side claw-shaped magnetic pole 84, the second stator side claw-shaped magnetic pole 74, and the fourth stator side claw-shaped magnetic pole 94 are excited to different magnetic poles from time to time. It becomes a pole-type stator.

  In the present embodiment, the plate thicknesses of the first to fourth stator core bases 61, 71, 81, 91 and the first to fourth rotor core bases 11, 21, 31, 41 are the same. As a result, the single stator 2a and the single rotor 1a have the same axial length.

  Therefore, in the single motor Ma in which the single rotor 1a is arranged inside the single stator 2a, the set of the first rotor side claw-shaped magnetic pole 13 and the third rotor side claw-shaped magnetic pole 33 and the first stator side The pair of the claw-shaped magnetic pole 64 and the third stator-side claw-shaped magnetic pole 84 are relatively disposed so as to face each other in the radial direction. Similarly, the set of the second rotor side claw-shaped magnetic pole 23 and the fourth rotor side claw-shaped magnetic pole 43 and the set of the second stator side claw-shaped magnetic pole 74 and the fourth stator side claw-shaped magnetic pole 94 are relatively relative to each other in the radial direction. Relative to be oriented.

  As shown in FIGS. 12 and 13, the single stator 2a is used as a U-phase, V-phase, and W-phase stator 2u, 2v, and 2w, and is laminated in the axial direction to form a stator 2 for three phases. Is formed.

Specifically, the U-phase, V-phase, and W-phase stators 2u, 2v, and 2w are stacked in this order.
At this time, as shown in FIG. 13, the U-phase stator 2u, the V-phase stator 2v, and the W-phase stator 2w are mechanically connected to the three-phase stator 2 including the U-phase, V-phase, and W-phase stators 2u, 2v, and 2w. The layers are stacked while being shifted by 5 degrees (60 degrees electrical angle).

  More specifically, the V-phase stator 2v is shifted from the U-phase stator 2u by a mechanical angle of 5 degrees (60 degrees in electrical angle) in the clockwise direction around the central axis O when viewed from the U-phase stator 2u. It is fixed to the housing. The W-phase stator 2w is fixed to the motor housing with a 5 ° mechanical angle (60 ° electrical angle) in the clockwise direction when viewed from the V-phase stator 2v.

  And as shown in FIG. 14, the U-phase alternating current Iu of a three-phase alternating current power supply flows into the 1st-4th annular windings 101-104 of the U-phase stator 2u. Further, the V-phase AC current Iv of the three-phase AC power source flows through the first to fourth annular windings 101 to 104 of the V-phase stator 2v. Further, the W-phase AC current Iw of the three-phase AC power source flows through the first to fourth annular windings 101 to 104 of the W-phase stator 2w.

Next, the operation of the brushless motor M configured as described above will be described.
Now, a three-phase AC power source is applied to the three-phase stator 2. That is, the U-phase AC current Iu is in the first to fourth annular windings 101 to 104 of the U-phase stator 2u, and the V-phase AC current Iv is in the first to fourth annular windings 101 to 104 of the V-phase stator 2v. However, the W-phase alternating current Iw flows through the first to fourth annular windings 101 to 104 of the W-phase stator 2w. As a result, a rotating magnetic field is generated in the three-phase stator 2 and the three-phase rotor 1 is rotationally driven.

  At this time, the three-phase stator 2 has a three-stage structure of U-phase, V-phase, and W-phase stators 2u, 2v, and 2w in accordance with the three-phase AC power source. Correspondingly, the three-phase rotor 1 has a three-stage structure of U-phase, V-phase, and W-phase rotors 1u, 1v, and 1w in the same manner. Thereby, in the stator and rotor of each phase, the stators facing each other in the axial direction can receive the magnetic fluxes of the first to fourth field magnets 51 to 54, respectively, and the output can be increased.

  Further, in each phase rotor (single rotor 1a), four first to fourth rotor cores 10, 20, 30, 40 are interposed in the axial direction in order of first to fourth field magnets 51 to 54. And laminated to form. The first rotor side claw-shaped magnetic pole 13 of the first rotor core 10 and the third rotor side claw-shaped magnetic pole 33 of the third rotor core 30 are set to the N pole by the first to fourth field magnets 51 to 54, and the second rotor core 20. The second rotor side claw-shaped magnetic pole 23 and the fourth rotor side claw-shaped magnetic pole 43 of the fourth rotor core 40 are set to the S pole.

  The front end surface 16 of the first rotor-side claw-shaped magnetic pole 13 and the front end surface 36 of the third rotor-side claw-shaped magnetic pole 33 are brought into contact with each other in the axial direction, and the front-end surface 26 of the second rotor-side claw-shaped magnetic pole 23 The tip surface 46 of the fourth rotor-side claw-shaped magnetic pole 43 was brought into contact in the axial direction.

  As a result, the first rotor-side claw-shaped magnetic pole 13 (third rotor-side claw) is compared with the case where the front-end surface 16 of the first rotor-side claw-shaped magnetic pole 13 and the front-end surface 36 of the third rotor-side claw-shaped magnetic pole 33 are separated. Change in magnetic flux density between the proximal end and the distal end of the magnetic pole 33) is reduced. Similarly, the second rotor side claw-shaped magnetic pole 23 (fourth rotor side claw) is compared with the case where the front end surface 26 of the second rotor side claw-shaped magnetic pole 23 and the front end surface 46 of the fourth rotor side claw-shaped magnetic pole 43 are separated from each other. Change in the magnetic flux density between the proximal end and the distal end of the magnetic pole 43) is reduced.

  That is, when both distal end surfaces 16 and 36 of the first and third rotor side claw-shaped magnetic poles 13 and 33 are separated and opened, the base end portions of the first and third rotor side claw-shaped magnetic poles 13 and 33 are opened. The magnetic flux density of the first and third rotor side claw-shaped magnetic poles 13 and 33 is dense, and the open portion between the tip portions of the first and third rotor side claw-shaped magnetic poles 13 and 33 has a large magnetic resistance, and the magnetic flux density is sparse.

  In other words, the magnetic flux density distribution of the N pole greatly varies in the axial direction, and the first and third stator side claw-shaped magnetic poles 64 and 84 of the single stator 2a have a non-uniform magnetic flux density distribution in the axial direction. Will give.

  Similarly, when both distal end surfaces 26 and 46 of the second and fourth rotor side claw-shaped magnetic poles 23 and 43 are separated and opened, the base ends of the second and fourth rotor side claw-shaped magnetic poles 23 and 43 are opened. The magnetic flux density of the portion is dense, and the open portion between the tip portions of the second and fourth rotor-side claw-shaped magnetic poles 23 and 43 has a large magnetic resistance, and the magnetic flux density is sparse.

  In other words, the magnetic flux density distribution of the S pole varies widely in the axial direction, and the magnetic flux density distribution which is non-uniform in the axial direction with respect to the second and fourth stator side claw-shaped magnetic poles 74 and 94 of the single stator 2a. Will give.

  On the other hand, since both end surfaces 16, 36 of the first and third rotor side claw-shaped magnetic poles 13, 33 are brought into contact with each other, the front end portions of the first and third rotor side claw-shaped magnetic poles 13, 33 are provided. The magnetic resistance between them becomes small, and the change in the magnetic flux density at the base end portion and the tip end portion of the first and third rotor side claw-shaped magnetic poles 13 and 33 becomes small. As a result, the variation in the magnetic flux density distribution of the N pole in the axial direction is reduced, and a uniform magnetic flux density distribution in the axial direction is provided to the first and third stator side claw-shaped magnetic poles 64 and 84 of the single stator 2a. Will give.

  Similarly, since both end surfaces 26 and 46 of the second and fourth rotor side claw-shaped magnetic poles 23 and 43 are brought into contact with each other, the front end portions of the second and fourth rotor side claw-shaped magnetic poles 23 and 43 are in contact with each other. The magnetic resistance is reduced, and the change in the magnetic flux density at the base end portion and the tip end portion of the second and fourth rotor side claw-shaped magnetic poles 23 and 43 is reduced. As a result, the variation in the magnetic flux density distribution of the S pole in the axial direction is reduced, and a uniform magnetic flux density distribution in the axial direction is provided to the second and fourth stator side claw-shaped magnetic poles 74 and 94 of the single stator 2a. Will give.

As a result, the rotor of each phase can individually apply a magnetic flux having a uniform magnetic flux density distribution in the axial direction to the opposing stator, and the output can be further increased.
Further, in the stator of each phase (single stator 2a), the first to fourth annular windings 101 to 104 are interposed in the order of the four first to fourth stator cores 60, 70, 80, 90 in the axial direction. And laminated to form.

  The front end surface 67 of the first stator side claw-shaped magnetic pole 64 and the front end surface 87 of the third stator side claw-shaped magnetic pole 84 are brought into contact with each other in the axial direction. The tip surface 97 of the fourth stator side claw-shaped magnetic pole 94 was brought into contact in the axial direction.

  As a result, the first stator side claw-shaped magnetic pole 64 (third stator side claw) is compared with the case where the front end surface 67 of the first stator side claw-shaped magnetic pole 64 and the front end surface 87 of the third stator side claw-shaped magnetic pole 84 are separated. Change in magnetic flux density between the proximal end and the distal end of the magnetic pole 84) is reduced. Similarly, the second stator side claw-shaped magnetic pole 74 (fourth stator side claw) is compared with the case where the front end surface 77 of the second stator side claw-shaped magnetic pole 74 and the front end surface 97 of the fourth stator side claw-shaped magnetic pole 94 are separated from each other. The change in magnetic flux density between the base end portion and the tip end portion of the magnetic pole 94) becomes small.

  That is, when both distal end surfaces 67 and 87 of the first and third stator side claw-shaped magnetic poles 64 and 84 are separated and opened, the base end portions of the first and third stator side claw-shaped magnetic poles 64 and 84 are opened. The magnetic flux density of the first and third stator side claw-shaped magnetic poles 64, 84 is dense, and the open portion between the tip portions of the first and third stator side claw-shaped magnetic poles 64, 84 has a large magnetic resistance and the magnetic flux density is sparse.

  In other words, the magnetic flux density distribution in the axial direction (the intensity distribution in the axial direction of the rotating magnetic field) varies greatly, and the first and third rotor side claw-shaped magnetic poles 13 and 33 of the single rotor 1a are This will give a non-uniform magnetic flux density distribution.

  Similarly, when both distal end surfaces 77 and 97 of the second and fourth stator side claw-shaped magnetic poles 74 and 94 are separated and opened, the base ends of the second and fourth stator side claw-shaped magnetic poles 74 and 94 are opened. The magnetic flux density of the portion is dense, and the open portion between the tips of the second and fourth stator side claw-shaped magnetic poles 74 and 94 has a large magnetic resistance and the magnetic flux density is sparse.

  In other words, the magnetic flux density distribution in the axial direction (the intensity distribution in the axial direction of the rotating magnetic field) varies widely, and the second and fourth rotor side claw-shaped magnetic poles 23 and 43 of the single rotor 1a are This will give a non-uniform magnetic flux density distribution.

  On the other hand, since both end surfaces 16 and 36 of the first and third stator side claw-shaped magnetic poles 64 and 84 are brought into contact with each other, the front end portions of the first and third stator side claw-shaped magnetic poles 64 and 84 are contacted. The magnetic resistance between the first and third stator side claw-shaped magnetic poles 64 and 84 becomes smaller, and the change in the magnetic flux density at the proximal end and the distal end of the first and third stator side claw-shaped magnetic poles 64 and 84 becomes smaller. As a result, variation in the magnetic flux density distribution in the axial direction (axial strength distribution of the rotating magnetic field) is reduced, and the axial direction relative to the first and third rotor side claw-shaped magnetic poles 13 and 33 of the single rotor 1a is reduced. Gives a uniform magnetic flux density distribution.

  Similarly, since both end surfaces 77 and 97 of the second and fourth stator side claw-shaped magnetic poles 74 and 94 are brought into contact with each other, the end portions of the second and fourth stator side claw-shaped magnetic poles 74 and 94 are in contact with each other. The magnetic resistance is reduced, and the change in the magnetic flux density at the base end portion and the tip end portion of the second and fourth stator side claw-shaped magnetic poles 74 and 94 is reduced. As a result, the variation in the magnetic flux density distribution in the axial direction (axial strength distribution of the rotating magnetic field) is reduced, and the axial direction relative to the second and fourth rotor side claw-shaped magnetic poles 23 and 43 of the single rotor 1a is reduced. Gives a uniform magnetic flux density distribution.

  Moreover, the fluctuation period of the magnetic flux density of the first and third stator side claw-shaped magnetic poles 64 and 84 and the fluctuation period of the magnetic flux density of the second and fourth stator side claw-shaped magnetic poles 74 and 94 will be 180 degrees out of phase. I have to.

As a result, the stator of each phase can individually apply magnetic fluxes having a uniform magnetic flux density distribution in the axial direction to the opposing rotors, and the output can be further increased.
In contrast, the U-phase, V-phase, and W-phase stators 2u, 2v, and 2w of the three-phase stator 2 are shifted by 5 degrees in the clockwise direction by mechanical angles (60 degrees in the clockwise direction by electrical angles). Thus, the U-phase, V-phase, and W-phase rotors 1u, 1v, and 1w of the three-phase rotor 1 were shifted by 5 degrees in the counterclockwise direction by mechanical angle (60 degrees in the counterclockwise direction by electrical angle). That is, the circumferential shifts between the U-phase, V-phase, and W-phase rotors 1u, 1v, and 1w opposite to the U-phase, V-phase, and W-phase stators 2u, 2v, and 2w are opposite to each other on the opposing surfaces. Inclined.

  As a result, each set of the first and third stator side claw-shaped magnetic poles 64 and 84 of each phase by the respective phase alternating currents Iu, Iv and Iw flowing in the first to fourth annular windings 101 to 104 of each phase and each phase The second and fourth stator side claw-shaped magnetic poles 74 and 94 are switched to the magnetic flux, the first and third rotor side claw-shaped magnetic poles 13 and 33 of each phase, and the second and fourth The pair of rotor side claw-shaped magnetic poles 23 and 43 can be suitably followed. As a result, suitable rotation of the three-phase rotor 1 can be realized.

Next, the effect of the said embodiment is described below.
(1) According to the above-described embodiment, the three-phase rotor 1 has a three-stage structure including the U-phase, V-phase, and W-phase rotors 1u, 1v, and 1w, and a three-phase stator corresponding thereto. 2 has the same three-stage structure as the U-phase, V-phase, and W-phase stators 2u, 2v, and 2w. A three-phase AC power source was applied to the three-phase stator 2. In each phase of the stator and rotor, the stators facing each other along the axial direction can receive the magnetic fluxes of the first to fourth field magnets 51 to 54 individually. The output can be increased.

  In addition, since the circumferential shift direction of the rotors 1u, 1v, 1w of each phase (each stage) and the circumferential shift direction of the stators 2u, 2v, 2w of each phase (each stage) are opposite to each other, the three-phase The suitable rotation of the rotor 1 can be realized.

  (2) According to the above-described embodiment, the first to fourth field magnets 51 to 54 are interposed in the axial direction in the first to fourth rotor cores 10, 20, 30, and 40 in the single rotor 1a. And laminated. The front end surface 16 of the first rotor-side claw-shaped magnetic pole 13 and the front end surface 36 of the third rotor-side claw-shaped magnetic pole 33 are brought into contact with each other in the axial direction, and the front-end surface 26 of the second rotor-side claw-shaped magnetic pole 23 The tip surface 46 of the fourth rotor-side claw-shaped magnetic pole 43 was brought into contact in the axial direction.

  Accordingly, the first and third rotor side claw-shaped magnetic poles 13 and 33 of the same polarity of the single rotor 1a are axially arranged with respect to the first and third stator side claw-shaped magnetic poles 64 and 84 of the single stator 2a. A magnetic flux having a uniform magnetic flux density distribution in the direction can be provided. Similarly, the second and fourth rotor side claw-shaped magnetic poles 23 and 43 of the same polarity of the single rotor 1a are compared with the second and fourth stator side claw-shaped magnetic poles 74 and 94 of the single stator 2a. A magnetic flux having a uniform magnetic flux density distribution in the axial direction can be provided.

As a result, the rotor of each phase can individually apply magnetic fluxes having a uniform magnetic flux density distribution in the axial direction to the opposing stators, and the output can be further increased.
(3) According to the said embodiment, the 1st-4th stator windings 60a, 70, 80, 90 are made to interpose the 1st-4th annular windings 101-104 in order in an axial direction. And laminated.

  The front end surface 67 of the first stator side claw-shaped magnetic pole 64 and the front end surface 87 of the third stator side claw-shaped magnetic pole 84 are brought into contact with each other in the axial direction. The tip surface 97 of the fourth stator side claw-shaped magnetic pole 94 was brought into contact in the axial direction.

  Accordingly, the first and third stator side claw-shaped magnetic poles 64 and 84 of the single stator 2a are uniform in the axial direction with respect to the first and third rotor side claw-shaped magnetic poles 13 and 33 of the single rotor 1a. A magnetic flux having a uniform magnetic flux density distribution can be provided. Similarly, the second and fourth stator side claw-shaped magnetic poles 74 and 94 of the single stator 2a are in the axial direction with respect to the second and fourth rotor side claw-shaped magnetic poles 23 and 43 of the single rotor 1a. A magnetic flux having a uniform magnetic flux density distribution can be applied.

As a result, the stator of each phase can individually apply a magnetic flux (rotating magnetic field) having a uniform magnetic flux density distribution in the axial direction to the opposing rotor, and the output can be further increased.
(4) According to the said embodiment, the single rotor 1a was formed with the 1st-4th rotor cores 10, 20, 30, and 40 and the 1st-4th field magnets 51-54.

  If the third and fourth rotor cores 30 and 40 are reversed in the axial direction with respect to the first and second rotor cores 10 and 20, the third and fourth rotor cores 30 and 40 become the first and second rotor cores. It was made to become the same shape as 10,20.

  Further, if the second and third field magnets 52 and 53 are reversed in the axial direction with respect to the first and fourth field magnets 51 and 54, the second and third field magnets 52 and 53 are The first and fourth field magnets 51 and 54 have the same magnetizing direction and the same shape.

Accordingly, the single rotor 1a (three-phase rotor 1) can be formed of two components, which facilitates component management and facilitates the assembly process.
(5) According to the above embodiment, the single stator 2a is formed by the first to fourth stator cores 60, 70, 80, 90 and the first to fourth annular windings 101 to 104.

  If the third and fourth stator cores 80 and 90 are reversed in the axial direction with respect to the first and second stator cores 60 and 70, the third and fourth stator cores 80 and 90 become the first and second stator cores. It was made to become the same shape as 60 and 70.

  If the second and third annular windings 102 and 103 are reversed in the axial direction with respect to the first and fourth annular windings 101 and 104, the second and third annular windings 102 and 103 are The first and fourth annular windings 101 and 104 have the same shape as the winding direction.

Accordingly, the single stator 2a (three-phase stator 2) can be formed of two components, facilitating component management and an assembling process.
From this, the single motor Ma (brushless motor M) can be formed of four components, which facilitates component management and facilitates the assembly process.

(Second Embodiment)
Hereinafter, a second embodiment of the motor will be described with reference to FIGS.
In the second embodiment, the front end surface 16 of the first rotor side claw-shaped magnetic pole 13 and the front end surface 36 of the third rotor side claw-shaped magnetic pole 33, and the front end surface 26 of the second rotor side claw-shaped magnetic pole 23 and the fourth rotor. It has a feature in that the tip surfaces 46 of the side claw-shaped magnetic poles 43 are arranged close to each other without contacting each other.

  Also, the tip surface 67 of the first stator side claw-shaped magnetic pole 64 and the tip surface 87 of the third stator side claw-shaped magnetic pole 84, and the tip surface 77 of the second stator side claw-shaped magnetic pole 74 and the fourth stator side claw-shaped magnetic pole. It has a feature in that the tip end surfaces 97 of 94 are arranged in close proximity to each other without contacting.

Therefore, in the second embodiment, for the sake of convenience of explanation, the characteristic portions will be described in detail, and the common portions have the same reference numerals as those of the first embodiment, and detailed description thereof will be omitted.
As shown in FIG. 15, the single motor Ma of each phase constituting the three-phase brushless motor M is composed of a single rotor 1a and a single stator 2a.

(Single rotor 1a)
As shown to Fig.16 (a), the plate | board thickness of the 1st-4th field magnets 51-54 is formed with the same thickness as 1st Embodiment. On the other hand, the first to fourth rotor side claw-shaped magnetic poles 13, 23, 33, 43 have the axial lengths corresponding to the plate thicknesses of the first to fourth rotor core bases 11, 21, 31, 41 ( (Length in the axial direction) is less than three times.

  Accordingly, as shown in FIGS. 15 and 16A, the tip surface 16 of the first rotor-side claw-shaped magnetic pole 13 and the tip surface 36 of the third rotor-side claw-shaped magnetic pole 33 are disposed close to each other in the axial direction. That is, they are opposed to each other with a gap G at a constant interval in the axial direction. Similarly, the tip surface 26 of the second rotor-side claw-shaped magnetic pole 23 and the tip surface 46 of the fourth rotor-side claw-shaped magnetic pole 43 are disposed in close proximity to each other in the axial direction, that is, have a gap G at a constant interval in the axial direction. And are arranged opposite to each other.

  That is, the single rotor 1a of the present embodiment includes the tip surfaces 16 and 36 of the first and third rotor side claw-shaped magnetic poles 13 and 33 and the second and fourth rotor side claw-shaped magnetic poles 23 and 43. This is a Landel type rotor having a gap G between the front end surfaces 26 and 46.

  As shown in FIGS. 17 and 18, this single rotor 1a is used as a U-phase, V-phase, and W-phase rotor 1u, 1v, 1w as in the first embodiment, and they are laminated in the axial direction. Thus, the rotor 1 of the brushless motor M for three phases is formed.

  At this time, as in the first embodiment, the U-phase rotor 1u and the W-phase rotor 1w are arranged with the first to fourth rotor cores 10, 20, 30, and 40 (first to fourth field magnets 51 to 54). It arrange | positions so that a direction may become the same direction. On the other hand, the V-phase rotor 1v stacked between the U-phase rotor 1u and the W-phase rotor 1w has first to fourth rotor cores 10, 20, 30, 40 (first to fourth field magnets 51 to 54). ) Is arranged in the opposite direction.

  Further, as shown in FIG. 18, the three-phase rotor 1 including the U-phase, V-phase, and W-phase rotors 1u, 1v, and 1w is similar to the first embodiment in that a U-phase rotor 1u and a V-phase rotor 1v are used. The W-phase rotor 1w is laminated with a mechanical angle shifted by 5 degrees (electrical angle 60 degrees).

(Single stator 2a)
As shown in FIG. 16B, the coil lengths (lengths in the axial direction) of the first to fourth annular windings 101 to 104 are formed with the same length as that of the first embodiment.

  On the other hand, the first to fourth stator side claw-shaped magnetic poles 64, 74, 84, 94 have their axial lengths set to the plate thicknesses of the first to fourth stator core bases 61, 71, 81, 91 ( (Length in the axial direction) is less than three times.

  Therefore, as shown in FIG. 15 and FIG. 16B, the tip surface 67 of the first stator side claw-shaped magnetic pole 64 and the tip surface 87 of the third stator side claw-shaped magnetic pole 84 are disposed close to each other in the axial direction. That is, they are opposed to each other with a gap G at a constant interval in the axial direction. Similarly, the front end surface 77 of the second stator side claw-shaped magnetic pole 74 and the front end surface 97 of the fourth stator side claw-shaped magnetic pole 94 are arranged in close proximity to each other in the axial direction, that is, have a gap G at a constant interval in the axial direction. And are arranged opposite to each other.

  That is, the single stator 2a of the present embodiment includes the tip surfaces 67 and 87 of the first and third stator side claw-shaped magnetic poles 64 and 84, and the second and fourth stator side claw-shaped magnetic poles 74 and 94. The stator has a Landel structure having a gap G between the front end surfaces 77 and 97.

  As shown in FIGS. 19 and 20, this single stator 2a is used as U-phase, V-phase, and W-phase stators 2u, 2v, and 2w as in the first embodiment, and they are laminated in the axial direction. Thus, the stator 2 of the brushless motor M for three phases is formed.

  At this time, similarly to the first embodiment, the U-phase stator 2u, the V-phase stator 2v, and the W-phase stator 2w are arranged for the three-phase stator 2 including the U-phase, V-phase, and W-phase stators 2u, 2v, and 2w. They are stacked with a mechanical angle shifted by 5 degrees (electrical angle 60 degrees).

  The U-phase AC current Iu of the three-phase AC power source flows through the first to fourth annular windings 101 to 104 of the U-phase stator 2u. Further, the V-phase AC current Iv of the three-phase AC power source flows through the first to fourth annular windings 101 to 104 of the V-phase stator 2v. Further, the W-phase AC current Iw of the three-phase AC power source flows through the first to fourth annular windings 101 to 104 of the W-phase stator 2w.

Next, the operation of the brushless motor M configured as described above will be described.
Now, a three-phase AC power source is applied to the three-phase stator 2. That is, the U-phase AC current Iu is in the first to fourth annular windings 101 to 104 of the U-phase stator 2u, and the V-phase AC current Iv is in the first to fourth annular windings 101 to 104 of the V-phase stator 2v. However, the W-phase alternating current Iw flows through the first to fourth annular windings 101 to 104 of the W-phase stator 2w. As a result, a rotating magnetic field is generated in the three-phase stator 2 and the three-phase rotor 1 is rotationally driven.

  At this time, the three-phase stator 2 has a three-stage structure of U-phase, V-phase, and W-phase stators 2u, 2v, and 2w in accordance with the three-phase AC power source. Correspondingly, the three-phase rotor 1 has a three-stage structure of U-phase, V-phase, and W-phase rotors 1u, 1v, and 1w in the same manner. Thereby, in the stator and rotor of each phase, the stators facing each other in the axial direction can receive the magnetic fluxes of the first to fourth field magnets 51 to 54, respectively, and the output can be increased.

  Further, in each phase rotor (single rotor 1a), four first to fourth rotor cores 10, 20, 30, 40 are interposed in the axial direction in order of first to fourth field magnets 51 to 54. And laminated to form. The first rotor side claw-shaped magnetic pole 13 of the first rotor core 10 and the third rotor side claw-shaped magnetic pole 33 of the third rotor core 30 are set to the N pole by the first to fourth field magnets 51 to 54, and the second rotor core 20. The second rotor side claw-shaped magnetic pole 23 and the fourth rotor side claw-shaped magnetic pole 43 of the fourth rotor core 40 are set to the S pole.

  At this time, the magnetic flux density of the second rotor side claw-shaped magnetic pole 23 is determined based on the three field magnets including the first, second and third field magnets 51, 52 and 53. The magnetic flux density of the third rotor-side claw-shaped magnetic pole 33 is determined based on three field magnets including the second, third, and fourth field magnets 52, 53, and 54.

  On the other hand, the magnetic flux density of the first rotor-side claw-shaped magnetic pole 13 is determined based on one first field magnet 51. Similarly, the magnetic flux density of the fourth rotor-side claw-shaped magnetic pole 43 is determined based on one fourth field magnet 54.

  As a result, the first rotor side claw-shaped magnetic pole 13 and the third rotor side claw-shaped magnetic pole 33 facing each other have a large difference in the generated magnetic flux. A reverse flow of magnetic flux occurs between the first rotor side claw-shaped magnetic pole 13 and the third rotor side claw-shaped magnetic pole 33. As a result, the magnetic flux density of the N pole is reduced as a whole, and the N pole having a small magnetic flux density is given to the first and third stator side claw-shaped magnetic poles 64 and 84 of the opposing stator 2a.

  Similarly, in the second rotor-side claw-shaped magnetic pole 23 and the fourth rotor-side claw-shaped magnetic pole 43, the difference in generated magnetic flux increases, so that when the tip surfaces 26 and 46 are in contact with each other, the first rotor side A backflow of magnetic flux occurs between the claw-shaped magnetic pole 13 and the third rotor-side claw-shaped magnetic pole 33. As a result, the magnetic flux density of the south pole is reduced as a whole, and the south pole having a small magnetic flux density is given to the second and fourth stator side claw-shaped magnetic poles 74 and 94 of the opposing stator 2a.

  On the other hand, the tip surfaces 16 and 36 of the first and third rotor side claw-shaped magnetic poles 13 and 33 are arranged close to each other in the axial direction to increase the magnetic resistance between the tip surfaces 16 and 36. As a result, the reverse flow of the magnetic flux between the first rotor side claw-shaped magnetic pole 33 and the third rotor side claw-shaped magnetic pole 33 based on the difference in the generated magnetic flux is suppressed, and the magnetic flux density of the N pole is increased as a whole.

  Similarly, the tip surfaces 26 and 46 of the second and fourth rotor side claw-shaped magnetic poles 23 and 43 are arranged close to each other in the axial direction to increase the magnetic resistance between the tip surfaces 26 and 46, and to generate a difference in generated magnetic flux. The reverse flow of the magnetic flux between the second rotor side claw-shaped magnetic pole 23 and the fourth rotor side claw-shaped magnetic pole 43 is suppressed, and the magnetic flux density of the S pole is increased as a whole.

Thereby, the rotor of each phase can give a magnetic pole with a high magnetic flux density to the opposing stator individually, and the output can be further increased.
Further, in the stator of each phase (single stator 2a), the first to fourth annular windings 101 to 104 are interposed in the order of the four first to fourth stator cores 60, 70, 80, 90 in the axial direction. And laminated to form.

  At this time, the magnetic flux density of the rotating magnetic field of the second stator side claw-shaped magnetic pole 74 is determined based on the three annular windings including the first, second, and third annular windings 101, 102, 103. Further, the magnetic flux density of the rotating magnetic field of the third stator side claw-shaped magnetic pole 84 is determined based on the three annular windings including the second, third, and fourth annular windings 102, 103, 104.

  On the other hand, the magnetic flux density of the rotating magnetic field of the first stator side claw-shaped magnetic pole 64 is determined based on one first annular winding 101. Similarly, the magnetic flux density of the rotating magnetic field of the fourth stator side claw-shaped magnetic pole 94 is determined based on one fourth annular winding 104.

  As a result, the first stator side claw-shaped magnetic pole 64 and the third stator side claw-shaped magnetic pole 84 which are opposed to each other have a large difference in magnetic flux generated by the rotating magnetic field. In this case, a reverse flow of magnetic flux occurs between the first stator side claw-shaped magnetic pole 64 and the third stator side claw-shaped magnetic pole 84. As a result, the magnetic flux density of the rotating magnetic field is reduced as a whole, and a reduced rotating magnetic field is applied to the first and third rotor side claw-shaped magnetic poles 13 and 33 of the opposing rotor 1a.

  Similarly, in the second stator side claw-shaped magnetic pole 74 and the fourth stator side claw-shaped magnetic pole 94, since the difference in magnetic flux generated by the rotating magnetic field is large, when the tip surfaces 77 and 97 are in contact with each other, A backflow of magnetic flux occurs between the first stator side claw-shaped magnetic pole 64 and the third stator side claw-shaped magnetic pole 84. As a result, the magnetic flux density of the rotating magnetic field is reduced as a whole, and a reduced rotating magnetic field is applied to the second and fourth rotor side claw-shaped magnetic poles 23 and 43 of the opposing rotor 1a.

  On the other hand, the tip surfaces 67 and 87 of the first and third stator side claw-shaped magnetic poles 64 and 84 are closely arranged opposite to each other in the axial direction to increase the magnetic resistance between the tip surfaces 67 and 87. As a result, the reverse flow of the magnetic flux between the first stator side claw-shaped magnetic pole 64 and the third stator side claw-shaped magnetic pole 84 based on the difference in the generated magnetic flux is suppressed, and the magnetic flux density of the rotating magnetic field is increased as a whole.

  Similarly, the tip surfaces 77 and 97 of the second and fourth stator side claw-shaped magnetic poles 74 and 94 are arranged close to each other in the axial direction, the magnetic resistance between the tip surfaces 77 and 97 is increased, and the difference in generated magnetic flux is caused. The backflow of the magnetic flux between the second stator side claw-shaped magnetic pole 74 and the fourth stator side claw-shaped magnetic pole 94 is suppressed, and the magnetic flux density of the rotating magnetic field is increased as a whole.

As a result, the stator of each phase can individually apply a rotating magnetic field having a high magnetic flux density to the opposing rotor, and the output can be further increased.
Incidentally, FIG. 21 shows a characteristic curve comparing the torque characteristics of the brushless motor M of the first embodiment and the second embodiment.

  The characteristic curve L1 shows the torque characteristic of the brushless motor M of the first embodiment, and the characteristic curve L2 shows the torque characteristic of the brushless motor M of the second embodiment. The experiment was performed under the same conditions except that the opposing tip surfaces of the rotor and the opposing tip surfaces of the stator were in contact with or separated from each other.

From this experimental result, it can be understood that a higher torque brushless motor M can be obtained based on the above reason.
As described above in detail, the second embodiment has the following effects in addition to the effects of the first embodiment.

  (1) According to the above embodiment, the front end surfaces 16 and 36 of the first and third rotor-side claw-shaped magnetic poles 13 and 33 are disposed close to and opposed to each other in the axial direction, and the first rotor side based on the difference in generated magnetic flux The reverse flow of the magnetic flux between the claw-shaped magnetic pole 13 and the third rotor side claw-shaped magnetic pole 33 was suppressed, and the magnetic flux density of the N pole was increased as a whole.

  Similarly, the tip surfaces 26 and 46 of the second and fourth rotor-side claw-shaped magnetic poles 23 and 43 are arranged close to each other in the axial direction so that the second rotor-side claw-shaped magnetic pole 23 and the fourth rotor are based on the difference in generated magnetic flux. The reverse flow of the magnetic flux between the side claw-shaped magnetic poles 43 was suppressed, and the magnetic flux density of the S pole was increased as a whole.

Thereby, the rotor of each phase can give a magnetic pole with a high magnetic flux density to the opposing stator individually, and the output can be further increased.
(2) According to the above-described embodiment, the first and third stator side claws based on the difference in generated magnetic flux are arranged such that the tip surfaces 67 and 87 of the first and third stator side claw-shaped magnetic poles 64 and 84 are disposed close to each other in the axial direction. The reverse flow of the magnetic flux between the magnetic pole 64 and the third stator side claw-shaped magnetic pole 84 is suppressed, and the magnetic flux density of the rotating magnetic field is increased as a whole.

  Similarly, the tip surfaces 77 and 97 of the second and fourth stator side claw-shaped magnetic poles 74 and 94 are arranged close to each other in the axial direction so that the second stator side claw-shaped magnetic pole 74 and the fourth stator are based on the difference in generated magnetic flux. The reverse flow of the magnetic flux between the side claw-shaped magnetic poles 94 was suppressed, and the magnetic flux density of the rotating magnetic field was increased as a whole.

As a result, the stator of each phase can individually apply a rotating magnetic field having a high magnetic flux density to the opposing rotor, and the output can be further increased.
(3) According to the above embodiment, the tip surfaces 16 and 36 of the first and third rotor-side claw-shaped magnetic poles 13 and 33 are disposed close to and opposed to each other in the axial direction. It can be kept small.

  Similarly, since the tip surfaces 26 and 46 of the second and fourth rotor-side claw-shaped magnetic poles 23 and 43 are disposed close to each other in the axial direction, fluctuations in the magnetic flux density in the axial direction can be reduced.

As a result, each phase of the rotor can provide magnetic fluxes having a small magnetic flux density distribution in the axial direction to the opposing stators, thereby further increasing the output.
(4) According to the above embodiment, the tip surfaces 67 and 87 of the first and third stator side claw-shaped magnetic poles 64 and 84 are disposed close to each other in the axial direction. It can be kept small.

  Similarly, since the tip surfaces 77 and 97 of the second and fourth stator side claw-shaped magnetic poles 74 and 94 are arranged close to each other in the axial direction, fluctuations in the magnetic flux density in the axial direction can be reduced.

As a result, the stator of each phase can individually apply a magnetic flux (rotating magnetic field) having a magnetic flux density distribution with a small variation in the axial direction to the opposing rotor, thereby further increasing the output.
(Third embodiment)
Hereinafter, a third embodiment of the motor will be described with reference to FIGS.

  In the third embodiment, unlike the first embodiment, a single field magnet is disposed between the second rotor core 20 and the third rotor core 30, and the second stator core 70 and the third stator core 80. This is characterized in that one annular winding is arranged between the two.

Therefore, in the third embodiment, for the sake of convenience of explanation, the characteristic portions will be described in detail, and the common portions will be denoted by the same reference numerals as those of the first embodiment, and detailed description thereof will be omitted.
As shown in FIG. 22, the single motor Ma of each phase constituting the three-phase brushless motor M includes a single rotor 1a and a single stator 2a.

(Single rotor 1a)
As shown in FIG. 23A, one field magnet (hereinafter referred to as a central field magnet) is provided between the second rotor core 20 (second rotor core base 21) and the third rotor core 30 (third rotor core base 31). 52A) is arranged. The central field magnet 52A is formed under the same conditions as the first field magnet 51 and the fourth field magnet 54 in shape, material, and function.

  That is, the plate thickness (length in the axial direction) of the central field magnet 52A is set to the same length as the plate thickness of the first field magnet 51 and the fourth field magnet 54. In addition, the diameter of the central field magnet 52 </ b> A is set to the same length as the diameters of the first field magnet 51 and the fourth field magnet 54. Further, the strength of the magnetic field of the central field magnet 52 </ b> A is set to the same length as the strength of the magnetic force of the first field magnet 51 and the fourth field magnet 54.

  Accordingly, the central field magnet 52A is formed with the same thickness as the first and fourth field magnets 51 and 54, and therefore the distance between the second and third rotor core bases 21 and 31 is as follows. The distance between the first and second rotor core bases 11 and 21 and the distance between the third and fourth rotor core bases 31 and 41 are the same.

  The central field magnet 52A is magnetized in the axial direction, and is magnetized so that the second rotor core 20 side becomes the S pole and the third rotor core 30 side becomes the N pole. Accordingly, the second rotor-side claw-shaped magnetic pole 23 of the second rotor core 20 functions as the S pole (second magnetic pole) by the central field magnet 52 </ b> A, and the third rotor-side claw-shaped magnetic pole 33 of the third rotor core 30. Functions as an N pole (first magnetic pole).

  As the central field magnet 52A is arranged between the second rotor core base 21 and the third rotor core base 31, the first to fourth rotor side claw-shaped magnetic poles 13, 23, 33, 43 The length in the axial direction is short so that 16, 36 and tip surfaces 26, 46 abut each other.

  More specifically, the axial length of the first rotor-side claw-shaped magnetic pole 13 (the length from the surface on the side opposite to the second rotor core 20 to the tip surface 16 of the first rotor core base 11) of the first rotor core base 11 is determined. The plate thickness (axial length) is 2.5 times.

  The length in the axial direction of the second rotor-side claw-shaped magnetic pole 23 (the length from the surface on the first rotor core 10 side of the second rotor core base 21 to the tip surface 26) is the thickness of the second rotor core base 21 ( (Length in the axial direction) is 2.5 times.

  Further, the axial length of the third rotor side claw-shaped magnetic pole 33 (the length from the surface of the third rotor core base 31 on the fourth rotor core 40 side to the tip surface 36) is the thickness of the third rotor core base 31 (the length of the third rotor core base 31). (Length in the axial direction) is 2.5 times.

  Furthermore, the axial length of the fourth rotor-side claw-shaped magnetic pole 43 (the length from the surface on the side opposite to the third rotor core 30 to the tip surface 46 of the fourth rotor core base 41) is the plate of the fourth rotor core base 41. It is 2.5 times the thickness (length in the axial direction).

  That is, the single rotor 1a of the present embodiment has the same plate thickness for the first field magnet 51, the central field magnet 52A, and the fourth field magnet 54. In other words, the distance between the first rotor core base 11 and the second rotor core base 21, the distance between the second rotor core base 21 and the third rotor core base 31, and the distance between the third rotor core base 31 and the fourth rotor core base 41 are as follows. Both were the same.

  Accordingly, as shown in FIG. 23 (a), the length between the tip surfaces 16, 36 of the first and third rotor side claw-shaped magnetic poles 13, 33 whose length in the axial direction is short, and the length in the axial direction are as follows. The rotor 1a has a Landel structure in which the tip surfaces 26 and 46 of the shortened second and fourth rotor-side claw-shaped magnetic poles 23 and 43 are in contact with each other.

  As shown in FIGS. 24 and 25, this single rotor 1a is used as the U-phase, V-phase, and W-phase rotors 1u, 1v, and 1w as in the first embodiment, and they are laminated in the axial direction. Thus, the rotor 1 of the brushless motor M for three phases is formed.

  At this time, similarly to the first embodiment, the U-phase rotor 1u and the W-phase rotor 1w are arranged such that the arrangement directions of the first to fourth rotor cores 10, 20, 30, 40 are the same. On the other hand, the V-phase rotor 1v stacked between the U-phase rotor 1u and the W-phase rotor 1w is arranged such that the arrangement directions of the first to fourth rotor cores 10, 20, 30, 40 are opposite. The

  Furthermore, as shown in FIG. 25, the three-phase rotor 1 including the U-phase, V-phase, and W-phase rotors 1u, 1v, and 1w is similar to the first embodiment in that the U-phase rotor 1u and the V-phase rotor 1v The W-phase rotor 1w is laminated with a mechanical angle shifted by 5 degrees (electrical angle 60 degrees).

(Single stator 2a)
As shown in FIG. 23B, one annular winding (hereinafter referred to as a central annular winding) is provided between the second stator core 70 (second stator core base 71) and the third stator core 80 (third stator core base 81). 102A) is arranged.

  The central annular winding 102A is disposed between the first annular winding 101 disposed between the first stator core base 61 and the second stator core base 71, and between the third stator core base 81 and the fourth stator core base 91. The fourth annular winding 104 is made of the same material and the same shape.

  That is, the coil length (axial length) of the central annular winding 102 </ b> A is the same as the coil lengths of the first annular winding 101 and the fourth annular winding 104. Further, the coil diameter of the central annular winding 102A is set to the same length as the coil diameters of the first annular winding 101 and the fourth annular winding 104. Further, the number of turns of the central annular winding 102A is set to be the same as the number of turns of the first annular winding 101 and the fourth annular winding 104.

  Accordingly, the central annular winding 102A is formed with the same coil length as that of the first and fourth annular windings 101 and 104, and therefore the interval between the second and third stator core bases 71 and 81 is as follows. The distance between the first and second stator core bases 61 and 71 and the distance between the third and fourth stator core bases 81 and 91 are the same.

  That is, the cylindrical second cylindrical wall 72 of the second stator core 70 has a plate thickness of the second stator core base 71 from the surface of the second stator core base 71 on the third stator core 80 side toward the third stator core 80 in the axial direction. Only half of it is extended. Similarly, the cylindrical third cylindrical wall 82 of the third stator core 80 has a plate thickness of the third stator core base 81 from the second stator core 70 side surface of the third stator core base 81 toward the second stator core 70 side in the axial direction. It is formed to extend only half of.

  As a result, when the annular front end surface 73 of the second cylindrical wall 72 and the annular front end surface 83 of the third cylindrical wall 82 abut, the distance between the second stator core base 71 and the third stator core base 81 is the first and second. The interval is the same as the interval between the stator core bases 61 and 71 and the interval between the third and fourth stator core bases 81 and 91.

  As the central annular winding 102A is disposed between the second and third stator core bases 71 and 81, the first to fourth stator side claw-shaped magnetic poles 64, 74, 84, and 94 The length in the axial direction is short so that the surfaces 67 and 87 and the tip surfaces 77 and 97 abut each other.

  More specifically, the axial length of the first stator side claw-shaped magnetic pole 64 (the length from the surface of the first stator core base 61 on the side opposite to the second stator core 70 to the front end surface 67) is the length of the first stator core base 61. The plate thickness (axial length) is 2.5 times.

  Further, the axial length of the second stator side claw-shaped magnetic pole 74 (the length from the surface of the second stator core base 71 on the first stator core 60 side to the tip surface 77) is the thickness of the second stator core base 71 ( (Length in the axial direction) is 2.5 times.

  Further, the axial length of the third stator side claw-shaped magnetic pole 84 (the length from the surface of the third stator core base 81 on the fourth stator core 90 side to the tip surface 87) is the thickness of the third stator core base 81 ( (Length in the axial direction) is 2.5 times.

  Furthermore, the length of the fourth stator side claw-shaped magnetic pole 94 in the axial direction (the length from the surface of the fourth stator core base 91 on the side opposite to the third stator core 80 to the tip surface 97) is the plate of the fourth stator core base 91. It is 2.5 times the thickness (length in the axial direction).

  That is, the single rotor 1a of the present embodiment has the same coil length for the first annular winding 101, the central annular winding 102A, and the fourth annular winding 104. In other words, the distance between the first stator core base 61 and the second stator core base 71, the distance between the second stator core base 71 and the third stator core base 81, the distance between the third stator core base 81 and the fourth stator core base 91, Both were the same.

  Therefore, as shown in FIG. 23 (a), the length between the tip surfaces 67 and 87 of the first and third stator side claw-shaped magnetic poles 64 and 84 whose axial length is shortened and the axial length is short. The stator 2a has a Landel structure in which the tip surfaces 77 and 97 of the shortened second and fourth stator side claw-shaped magnetic poles 74 and 94 are in contact with each other.

  As shown in FIGS. 26 and 27, this single stator 2a is used as the U-phase, V-phase, and W-phase stators 2u, 2v, and 2w as in the first embodiment, and they are laminated in the axial direction. Thus, the stator 2 of the brushless motor M for three phases is formed.

  At this time, similarly to the first embodiment, the U-phase stator 2u, the V-phase stator 2v, and the W-phase stator 2w are arranged for the three-phase stator 2 including the U-phase, V-phase, and W-phase stators 2u, 2v, and 2w. They are stacked with a mechanical angle shifted by 5 degrees (electrical angle 60 degrees).

  And U phase alternating current Iu of a three phase alternating current power supply flows into U phase stator 2u. Further, a V-phase AC current Iv of a three-phase AC power source flows through the V-phase stator 2v. Furthermore, a W-phase AC current Iw of a three-phase AC power source flows through the W-phase stator 2w.

Next, the operation of the brushless motor M configured as described above will be described.
In each phase of the rotor, four first to fourth rotor cores 10, 20, 30, 40 are stacked in order in the axial direction with the first, center and fourth field magnets 51, 52A, 54 interposed therebetween. Formed. The first and third rotor-side claw-shaped magnetic poles 13 and 33 are turned to the N pole, and the second and fourth rotor-side claw-shaped magnetic poles 23 and 43 by the first and center portions and the fourth field magnets 51, 52A, and 54. Becomes the S pole.

  At this time, the magnetic flux density of the second rotor-side claw-shaped magnetic pole 23 is determined based on two field magnets including the first field magnet 51 and the central field magnet 52A. Further, the magnetic flux density of the third rotor side claw-shaped magnetic pole 33 is determined based on two field magnets including the central field magnet 52 </ b> A and the fourth field magnet 54.

  On the other hand, the magnetic flux density of the first rotor-side claw-shaped magnetic pole 13 is determined based on one first field magnet 51. Similarly, the magnetic flux density of the fourth rotor-side claw-shaped magnetic pole 43 is determined based on one fourth field magnet 54.

  As a result, the difference in generated magnetic flux between the opposed first rotor side claw-shaped magnetic pole 13 and third rotor side claw-shaped magnetic pole 33 is smaller than that in the first embodiment. That is, the backflow of the magnetic flux generated between the first rotor side claw-shaped magnetic pole 13 and the third rotor side claw-shaped magnetic pole 33 in which the tip surfaces 16 and 36 are in contact with each other is suppressed to be smaller than that in the first embodiment. It is done. As a result, the magnetic flux density of the N pole is increased as a whole as compared with the case of the first embodiment, and the first and third stator side claw-shaped magnetic poles 64 and 84 of the opposing stator 2a are the first embodiment. As compared with the case of the above, an N pole having a larger magnetic flux density is given.

  Similarly, in the second rotor-side claw-shaped magnetic pole 23 and the fourth rotor-side claw-shaped magnetic pole 43, the difference in generated magnetic flux is smaller than that in the first embodiment. That is, the reverse flow of the magnetic flux generated between the first rotor-side claw-shaped magnetic pole 13 and the third rotor-side claw-shaped magnetic pole 33 with which the tip surfaces 26 and 46 are in contact with each other is suppressed to be smaller than that in the first embodiment. As a result, the magnetic flux density of the S pole as a whole is larger than that of the first embodiment, and the second and fourth stator side claw-shaped magnetic poles 74 and 94 of the opposing stator 2a are compared with the case of the first embodiment. Compared to this, an S pole having a larger magnetic flux density is provided.

Thereby, the rotor of each phase can give a magnetic pole with a high magnetic flux density to the opposing stator individually, and the output can be further increased.
On the other hand, in the stator of each phase (single stator 2a), the four first to fourth stator cores 60, 70, 80, 90 are arranged in the axial direction in the order of the first, center portion, and fourth annular winding 101, It was formed by laminating 102A and 104.

  At this time, the magnetic flux density of the rotating magnetic field of the second stator side claw-shaped magnetic pole 74 is determined based on the two annular windings including the first annular winding 101 and the central annular winding 102A. The magnetic flux density of the rotating magnetic field of the third stator side claw-shaped magnetic pole 84 is determined based on the two annular windings including the central annular winding 102A and the fourth annular winding 104.

  On the other hand, the magnetic flux density of the rotating magnetic field of the first stator side claw-shaped magnetic pole 64 is determined based on one first annular winding 101. Similarly, the magnetic flux density of the rotating magnetic field of the fourth stator side claw-shaped magnetic pole 94 is determined based on one fourth annular winding 104.

  As a result, in the first and third stator side claw-shaped magnetic poles 64 and 84 facing each other, the difference in magnetic flux generated by the rotating magnetic field is smaller than in the case of the first embodiment. That is, the backflow of the magnetic flux generated between the first stator side claw-shaped magnetic pole 64 and the third stator side claw-shaped magnetic pole 84 in which the tip surfaces 67 and 87 are in contact with each other is suppressed to be smaller than that in the first embodiment. It is done.

  As a result, the magnetic flux density of the rotating magnetic field becomes larger than that in the first embodiment, and an increased rotating magnetic field is applied to the first and third rotor side claw-shaped magnetic poles 13 and 33 of the opposing rotor 1a. Become.

  Similarly, in the second and fourth stator side claw-shaped magnetic poles 74 and 94 facing each other, the difference in magnetic flux generated by the rotating magnetic field is smaller than in the case of the first embodiment. That is, the reverse flow of the magnetic flux generated between the second stator side claw-shaped magnetic pole 74 and the fourth stator side claw-shaped magnetic pole 94 in which the tip surfaces 77 and 97 are in contact with each other is suppressed to be smaller than that in the first embodiment. It is done.

  As a result, the magnetic flux density of the rotating magnetic field becomes larger than that in the first embodiment, and an increased rotating magnetic field is applied to the second and fourth rotor side claw-shaped magnetic poles 23 and 43 of the opposing rotor 1a. Become.

From the above, the stator of each phase can individually apply a rotating magnetic field having a high magnetic flux density to the opposing rotor, and the output can be further increased.
Incidentally, FIG. 28 shows a characteristic curve comparing the torque characteristics of the brushless motor M of the first embodiment and the third embodiment.

  The characteristic curve L1 shows the torque characteristic of the brushless motor M of the first embodiment, and the characteristic curve L3 shows the torque characteristic of the brushless motor M of the third embodiment. The experimental conditions were the same except for the number of field magnets and the number of annular windings.

From this experimental result, it can be understood that a higher torque brushless motor M can be obtained based on the above reason.
As described above in detail, the third embodiment has the following effects in addition to the effects of the first embodiment.

(1) According to the above embodiment, one central field magnet 52 </ b> A that is the same as the first field magnet 51 and the fourth field magnet 54 is disposed between the second rotor core 20 and the third rotor core 30. .
And the reverse flow of the magnetic flux between the 1st rotor side claw-shaped magnetic pole 33 and the 3rd rotor side claw-shaped magnetic pole 33 based on the difference of generated magnetic flux, and the 2nd rotor side claw-shaped magnetic pole 23 and the 4th rotor side claw-shaped. The backflow of the magnetic flux between the magnetic poles 43 was suppressed.

Therefore, the rotor of each phase can give a magnetic pole with a high magnetic flux density to the opposing stator individually, and the output can be further increased.
(2) According to the above embodiment, between the second stator core 70 and the third stator core 80, the same central annular winding 102A as the first annular winding 101 and the fourth annular winding 104 is provided. Arranged.

  And the reverse flow of the magnetic flux between the 1st stator side claw-shaped magnetic pole 64 and the 3rd stator side claw-shaped magnetic pole 84 based on the difference of generated magnetic flux, and the 2nd stator side claw-shaped magnetic pole 74 and the 4th stator side claw-shaped. The backflow of the magnetic flux between the magnetic poles 94 was suppressed.

Therefore, the stator of each phase can individually apply a rotating magnetic field having a high magnetic flux density to the opposing rotors, and the output can be further increased.
(Fourth embodiment)
Hereinafter, a fourth embodiment of the motor will be described with reference to FIGS.

  The fourth embodiment is different from the third embodiment in that the tip surface 16 of the first rotor-side claw-shaped magnetic pole 13, the tip surface 36 of the third rotor-side claw-shaped magnetic pole 33, and the second rotor-side claw-shaped magnetic pole 23. The front end surface 26 and the front end surface 46 of the fourth rotor-side claw-shaped magnetic pole 43 are arranged in close proximity to each other without being brought into contact with each other.

  Also, the tip surface 67 of the first stator side claw-shaped magnetic pole 64 and the tip surface 87 of the third stator side claw-shaped magnetic pole 84, and the tip surface 77 of the second stator side claw-shaped magnetic pole 74 and the fourth stator side claw-shaped magnetic pole. It has a feature in that the tip end surfaces 97 of 94 are arranged in close proximity to each other without contacting.

Therefore, in the fourth embodiment, for the sake of convenience of explanation, the characteristic portions will be described in detail, and the common portions have the same reference numerals as those of the third embodiment, and detailed description thereof will be omitted.
As shown in FIG. 29, the single motor Ma of each phase constituting the three-phase brushless motor M includes a single rotor 1a and a single stator 2a.

(Single rotor 1a)
As shown in FIG. 30 (a), the plate thicknesses of the three first, center and fourth field magnets 51, 52A, 54 are the same as those in the third embodiment. On the other hand, the first to fourth rotor side claw-shaped magnetic poles 13, 23, 33, 43 have the axial lengths corresponding to the plate thicknesses of the first to fourth rotor core bases 11, 21, 31, 41 ( (Length in the axial direction) is less than 2.5 times.

  Accordingly, as shown in FIGS. 29 and 30A, the tip surface 16 of the first rotor-side claw-shaped magnetic pole 13 and the tip surface 36 of the third rotor-side claw-shaped magnetic pole 33 are disposed close to each other in the axial direction. That is, they are opposed to each other with a gap G at a constant interval in the axial direction. Similarly, the tip surface 26 of the second rotor-side claw-shaped magnetic pole 23 and the tip surface 46 of the fourth rotor-side claw-shaped magnetic pole 43 are disposed in close proximity to each other in the axial direction, that is, have a gap G at a constant interval in the axial direction. And are arranged opposite to each other.

  That is, the single rotor 1a of the present embodiment includes the tip surfaces 16 and 36 of the first and third rotor side claw-shaped magnetic poles 13 and 33 and the second and fourth rotor side claw-shaped magnetic poles 23 and 43. This is a Landel type rotor having a gap G between the front end surfaces 26 and 46.

  As shown in FIGS. 31 and 32, this single rotor 1a is used as U-phase, V-phase, and W-phase rotors 1u, 1v, and 1w as in the third embodiment, and they are laminated in the axial direction. Thus, the rotor 1 of the brushless motor M for three phases is formed.

  At this time, similarly to the third embodiment, the U-phase rotor 1u and the W-phase rotor 1w are arranged such that the arrangement directions of the first to fourth rotor cores 10, 20, 30, 40 are the same. On the other hand, the V-phase rotor 1v stacked between the U-phase rotor 1u and the W-phase rotor 1w is arranged such that the arrangement directions of the first to fourth rotor cores 10, 20, 30, 40 are opposite. The

  Further, as shown in FIG. 32, the three-phase rotor 1 including the U-phase, V-phase, and W-phase rotors 1u, 1v, and 1w is similar to the third embodiment in that a U-phase rotor 1u and a V-phase rotor 1v are used. The W-phase rotor 1w is laminated with a mechanical angle shifted by 5 degrees (electrical angle 60 degrees).

(Single stator 2a)
As shown in FIG. 30 (b), the coil lengths (lengths in the axial direction) of the first, center and fourth annular windings 101, 102A, 104 are the same as those in the third embodiment. Yes.

  On the other hand, the first to fourth stator side claw-shaped magnetic poles 64, 74, 84, 94 have their axial lengths set to the plate thicknesses of the first to fourth stator core bases 61, 71, 81, 91 ( (Length in the axial direction) is less than 2.5 times.

  Therefore, as shown in FIG. 29 and FIG. 30B, the tip surface 67 of the first stator side claw-shaped magnetic pole 64 and the tip surface 87 of the third stator side claw-shaped magnetic pole 84 are disposed close to each other in the axial direction. That is, they are opposed to each other with a gap G at a constant interval in the axial direction. Similarly, the front end surface 77 of the second stator side claw-shaped magnetic pole 74 and the front end surface 97 of the fourth stator side claw-shaped magnetic pole 94 are arranged in close proximity to each other in the axial direction, that is, have a gap G at a constant interval in the axial direction. And are arranged opposite to each other.

  That is, the single stator 2a of the present embodiment includes the tip surfaces 67 and 87 of the first and third stator side claw-shaped magnetic poles 64 and 84, and the second and fourth stator side claw-shaped magnetic poles 74 and 94. The stator has a Landel structure having a gap G between the front end surfaces 77 and 97.

  As shown in FIGS. 33 and 34, this single stator 2a is used as U-phase, V-phase, and W-phase stators 2u, 2v, and 2w as in the third embodiment, and they are laminated in the axial direction. Thus, the stator 2 of the brushless motor M for three phases is formed.

  At this time, as in the third embodiment, the U-phase stator 2u, the V-phase stator 2v, and the W-phase stator 2w are arranged for the three-phase stator 2 including the U-phase, V-phase, and W-phase stators 2u, 2v, and 2w. They are stacked with a mechanical angle shifted by 5 degrees (electrical angle 60 degrees).

  And U phase alternating current Iu of a three phase alternating current power supply flows into U phase stator 2u. Further, a V-phase AC current Iv of a three-phase AC power source flows through the V-phase stator 2v. Furthermore, a W-phase AC current Iw of a three-phase AC power source flows through the W-phase stator 2w.

Next, the operation of the brushless motor M configured as described above will be described.
The magnetic flux density of the second rotor-side claw-shaped magnetic pole 23 is determined based on two field magnets including the first field magnet 51 and the central field magnet 52A. Further, the magnetic flux density of the third rotor side claw-shaped magnetic pole 33 is determined based on two field magnets including the central field magnet 52 </ b> A and the fourth field magnet 54.

  On the other hand, the magnetic flux density of the first rotor-side claw-shaped magnetic pole 13 is determined based on one first field magnet 51. Similarly, the magnetic flux density of the fourth rotor-side claw-shaped magnetic pole 43 is determined based on one fourth field magnet 54.

  As a result, the difference in generated magnetic flux between the opposed first rotor side claw-shaped magnetic pole 13 and third rotor side claw-shaped magnetic pole 33 is reduced. In addition, since the tip surfaces 16 and 36 are arranged close to each other, the gap between the first rotor-side claw-shaped magnetic pole 13 and the third rotor-side claw-shaped magnetic pole 33 is smaller than when the tip surfaces 16 and 36 are in contact with each other. The backflow of the magnetic flux generated by the is further reduced.

As a result, the reverse flow of the magnetic flux can be further reduced, so that the magnetic flux density of the N pole can be increased.
Similarly, in the second rotor side claw-shaped magnetic pole 23 and the fourth rotor side claw-shaped magnetic pole 43, the difference in generated magnetic flux becomes small. In addition, since the tip surfaces 26 and 46 are arranged close to each other, the tip surfaces 26 and 46 are generated between the first rotor side claw-shaped magnetic pole 13 and the third rotor side claw-shaped magnetic pole 33 in contact with each other. The backflow of magnetic flux is kept small.

As a result, the backflow of the magnetic flux can be further reduced, so that the magnetic flux density of the S pole can be increased.
From the above, the rotor of each phase can give a large magnetic pole individually to the opposing stator, and the output can be further increased.

  On the other hand, the magnetic flux density of the rotating magnetic field of the second stator side claw-shaped magnetic pole 74 is determined based on the two annular windings including the first annular winding 101 and the central annular winding 102A. The magnetic flux density of the rotating magnetic field of the third stator side claw-shaped magnetic pole 84 is determined based on the two annular windings including the central annular winding 102A and the fourth annular winding 104.

  On the other hand, the magnetic flux density of the rotating magnetic field of the first stator side claw-shaped magnetic pole 64 is determined based on one first annular winding 101. Similarly, the magnetic flux density of the rotating magnetic field of the fourth stator side claw-shaped magnetic pole 94 is determined based on one fourth annular winding 104.

  As a result, the difference in generated magnetic flux between the opposed first stator side claw-shaped magnetic pole 64 and third stator side claw-shaped magnetic pole 84 is reduced. In addition, since the front end surfaces 67 and 87 are arranged close to each other, they are located between the first stator side claw-shaped magnetic pole 64 and the third stator side claw-shaped magnetic pole 84 as compared with the case where the front end surfaces 67 and 87 are in contact with each other. The backflow of the magnetic flux generated by the is further reduced.

As a result, the backflow of magnetic flux can be further reduced, and the rotating magnetic field can be increased.
Similarly, the difference in generated magnetic flux between the second stator side claw-shaped magnetic pole 74 and the fourth stator side claw-shaped magnetic pole 94 which face each other is reduced. In addition, since the front end surfaces 77 and 97 are arranged close to each other, the second stator side claw-shaped magnetic pole 74 and the fourth stator side claw-shaped magnetic pole 94 are compared with the case where the front end surfaces 77 and 97 are in contact with each other. The backflow of the magnetic flux generated by the is further reduced.

As a result, the backflow of magnetic flux can be further reduced, and the rotating magnetic field can be increased.
From the above, the stator of each phase can individually apply a large rotating magnetic field to the opposing rotor, and the output can be further increased.

Incidentally, a characteristic curve L4 shown in FIG. 28 shows a torque characteristic of the brushless motor M of the fourth embodiment.
As apparent from FIG. 28, it can be understood that higher torque can be obtained than the brushless motor M shown in the second embodiment shown in FIG.

  In FIG. 28, the torque characteristics are slightly smaller than those of the brushless motor M of the third embodiment. This is because of the gap G between the tip surfaces 16 and 36 (tip surfaces 26 and 46) and the tip surfaces 67 and 87 (tip tips). This is considered to be caused by the size of the gap G between the surfaces 77 and 97).

  That is, if the gap G is too large, it is considered that the magnetic flux density distribution varies in the axial direction in each claw-shaped magnetic pole. Therefore, these gaps G need to be set in consideration of the magnetic flux density distribution in the axial direction in each claw-shaped magnetic pole.

As described above in detail, the fourth embodiment has the following effects in addition to the effects of the third embodiment.
(1) According to the above embodiment, the front end surfaces 16 and 36 of the first and third rotor-side claw-shaped magnetic poles 13 and 33 are disposed close to and opposed to each other in the axial direction, and the first rotor side based on the difference in generated magnetic flux The reverse flow of the magnetic flux between the claw-shaped magnetic pole 13 and the third rotor side claw-shaped magnetic pole 33 was suppressed, and the magnetic flux density of the N pole was increased as a whole. Similarly, the tip surfaces 26 and 46 of the second and fourth rotor-side claw-shaped magnetic poles 23 and 43 are arranged close to each other in the axial direction so that the second rotor-side claw-shaped magnetic pole 23 and the fourth rotor are based on the difference in generated magnetic flux. The reverse flow of the magnetic flux between the side claw-shaped magnetic poles 43 was suppressed, and the magnetic flux density of the S pole was increased as a whole.

Thereby, the rotor of each phase can give a magnetic pole with a high magnetic flux density to the opposing stator individually, and the output can be further increased.
(2) According to the above-described embodiment, the first and third stator side claws based on the difference in generated magnetic flux are arranged such that the tip surfaces 67 and 87 of the first and third stator side claw-shaped magnetic poles 64 and 84 are disposed close to each other in the axial direction. The reverse flow of the magnetic flux between the magnetic pole 64 and the third stator side claw-shaped magnetic pole 84 is suppressed, and the magnetic flux density of the rotating magnetic field is increased as a whole. Similarly, the tip surfaces 77 and 97 of the second and fourth stator side claw-shaped magnetic poles 74 and 94 are arranged close to each other in the axial direction so that the second stator side claw-shaped magnetic pole 74 and the fourth stator are based on the difference in generated magnetic flux. The reverse flow of the magnetic flux between the side claw-shaped magnetic poles 94 is suppressed, and the magnetic flux density of the rotating magnetic field is increased as a whole.

As a result, the stator of each phase can individually apply a rotating magnetic field having a high magnetic flux density to the opposing rotor, and the output can be further increased.
(3) According to the above embodiment, the tip surfaces 16 and 36 of the first and third rotor-side claw-shaped magnetic poles 13 and 33 are disposed close to and opposed to each other in the axial direction. It can be kept small.

  Similarly, since the tip surfaces 26 and 46 of the second and fourth rotor-side claw-shaped magnetic poles 23 and 43 are disposed close to each other in the axial direction, fluctuations in the magnetic flux density in the axial direction can be reduced.

As a result, each phase of the rotor can provide magnetic fluxes having a small magnetic flux density distribution in the axial direction to the opposing stators, thereby further increasing the output.
(4) According to the above embodiment, the tip surfaces 67 and 87 of the first and third stator side claw-shaped magnetic poles 64 and 84 are disposed close to each other in the axial direction. It can be kept small.

  Similarly, since the tip surfaces 77 and 97 of the second and fourth stator side claw-shaped magnetic poles 74 and 94 are arranged close to each other in the axial direction, fluctuations in the magnetic flux density in the axial direction can be reduced.

As a result, the stator of each phase can individually apply a magnetic flux (rotating magnetic field) having a magnetic flux density distribution with a small variation in the axial direction to the opposing rotor, thereby further increasing the output.
Each of the above embodiments may be modified as follows.

  In the first and second embodiments, the second field magnet 52 and the third field magnet 53 are separately configured. However, the second field magnet 52 and the third field magnet 53 are integrated into one. It may be implemented with two field magnets.

  In the first and second embodiments, the second annular winding 102 and the third annular winding 103 are separately configured. However, the second annular winding 102 and the third annular winding 103 are integrated into one. It may be implemented with two annular windings.

  In the first to fourth embodiments, the thicknesses of the first to fourth rotor cores 10, 20, 30, and 40 are all the same. The front end surfaces 16 and 36 of the first and third rotor side claw-shaped magnetic poles 13 and 33 are in contact with or in close proximity to each other, and the front end surfaces 26 and 2 of the second and fourth rotor side claw-shaped magnetic poles 23 and 43 are disposed. The thickness of the first to fourth rotor cores 10, 20, 30, and 40 may be different from each other within a range in which 46 is in contact with or in close proximity to each other.

  In the first and second embodiments, the plate thicknesses (lengths in the axial direction) of the first to fourth field magnets 51 to 54 are the same. The front end surfaces 16 and 36 of the first and third rotor side claw-shaped magnetic poles 13 and 33 are in contact with or in close proximity to each other, and the front end surfaces 26 and 2 of the second and fourth rotor side claw-shaped magnetic poles 23 and 43 are disposed. As long as 46 is in contact with or in close proximity to each other, the first to fourth field magnets 51 to 54 may have different plate thicknesses (lengths in the axial direction).

  Further, in the second and third field magnets 52 and 53, which are arranged at the center position in the axial direction and have little leakage magnetic flux to the outside, the plate thickness of the second and third field magnets 52 and 53 is set to the first thickness. Of course, the thickness of the fourth field magnets 51 and 54 may be made thinner (the magnetic flux density is reduced).

  In the first and second embodiments, the thicknesses of the first to fourth rotor cores 10, 20, 30, and 40 and the thicknesses of the first to fourth field magnets 51 to 54 are the same. The front end surfaces 16 and 36 of the first and third rotor side claw-shaped magnetic poles 13 and 33 are in contact with or in close proximity to each other, and the front end surfaces 26 and 2 of the second and fourth rotor side claw-shaped magnetic poles 23 and 43 are disposed. As long as 46 is in contact with or in close proximity to each other, the thickness of the first to fourth rotor cores 10, 20, 30, 40 and the thickness of the first to fourth field magnets 51 to 54 are different from each other. May be.

In this case, it is necessary to change the axial lengths of the first to fourth rotor side claw-shaped magnetic poles 13, 23, 33, 43.
In the first to fourth embodiments, the thicknesses of the first to fourth stator cores 60, 70, 80, 90 are the same. The front end surfaces 67 and 87 of the first and third stator side claw-shaped magnetic poles 64 and 84 are in contact with or in close proximity to each other, and the front end surface 77 of the second and fourth stator side claw-shaped magnetic poles 74 and 94 are arranged. The thickness of the first to fourth stator cores 60, 70, 80, 90 may be different from each other as long as 97 is in contact with or in close proximity to each other.

  In the first and second embodiments, the first to fourth annular windings 101 to 104 have the same axial length. The front end surfaces 67 and 87 of the first and third stator side claw-shaped magnetic poles 64 and 84 are in contact with or in close proximity to each other, and the front end surface 77 of the second and fourth stator side claw-shaped magnetic poles 74 and 94 are arranged. The axial lengths of the first to fourth annular windings 101 to 104 may be different from each other within a range in which 97 is in contact with or in close proximity to each other.

  Further, the second and third annular windings 102 and 103 which are arranged at the center in the axial direction and have little leakage magnetic flux to the outside have a length in the axial direction of the second and third annular windings 102 and 103. Of course, the length of the first and fourth annular windings 101 and 104 may be shorter than the axial length (reducing the number of turns).

  In the first and second embodiments, the thicknesses of the first to fourth stator cores 60, 70, 80, 90 are the same as the axial lengths of the first to fourth annular windings 101 to 104. did. The front end surfaces 67 and 87 of the first and third stator side claw-shaped magnetic poles 64 and 84 are in contact with or in close proximity to each other, and the front end surface 77 of the second and fourth stator side claw-shaped magnetic poles 74 and 94 are arranged. The thickness of the first to fourth stator cores 60, 70, 80, 90 and the axial length of the first to fourth annular windings 101 to 104 are different within a range in which 97 is in contact with or in close proximity to each other. May be implemented.

In this case, it is necessary to change the length of the first to fourth stator side claw-shaped magnetic poles 64, 74, 84, 94 in the axial direction.
In the above embodiments, the axial lengths of the first and third rotor-side claw-shaped magnetic poles 13 and 33 are the same, but the tip surfaces of the first and third rotor-side claw-shaped magnetic poles 13 and 33 are the same. As long as 16 and 36 are in contact or close to each other, they do not have to be the same length. This makes it possible to adjust the flow of magnetic flux flowing through the first and third rotor-side claw-shaped magnetic poles 13 and 33, and is effective in reducing vibration.

  Similarly, the axial lengths of the second and fourth rotor side claw-shaped magnetic poles 23 and 43 are the same, but the tip surfaces 26 and 46 of the second and fourth rotor side claw-shaped magnetic poles 23 and 43 are the same. The lengths may not be the same as long as they are in contact or close to each other. As a result, the flow direction of the magnetic flux flowing through the second and fourth rotor side claw-shaped magnetic poles 23 and 43 can be adjusted, which is effective in reducing vibration.

  In the above embodiments, the axial lengths of the first and third stator side claw-shaped magnetic poles 64 and 84 are the same, but the tip surfaces of the first and third stator side claw-shaped magnetic poles 64 and 84 are the same. As long as 67 and 87 are arranged in contact or close to each other, the lengths may not be the same. As a result, the flow direction of the magnetic flux flowing through the first and third stator side claw-shaped magnetic poles 64 and 84 can be adjusted, which is effective in reducing vibration.

  Similarly, the axial lengths of the second and fourth stator side claw-shaped magnetic poles 74 and 94 are the same, but the tip surfaces 77 and 97 of the second and fourth stator side claw-shaped magnetic poles 74 and 94 are the same. The lengths may not be the same as long as they are in contact or close to each other. As a result, the flow direction of the magnetic flux flowing through the second and fourth stator side claw-shaped magnetic poles 74 and 94 can be adjusted, which is effective in reducing vibration.

  In the first and second embodiments, in the single stator 2a, the first to fourth annular windings 101 to 104 are connected in series so that a single-phase alternating current flows. The fourth annular windings 101 to 104 may be connected in parallel so that a single-phase alternating current flows.

Of course, a switching circuit that selectively switches the first to fourth annular windings 101 to 104 to serial connection or parallel connection may be provided so as to switch according to the output of the single motor Ma.
Similarly, for each phase stator 2u, 2v, 2w of the three-phase brushless motor M, each annular winding may be implemented in parallel connection or selectively switched to series connection or parallel connection. Good.

  In the third and fourth embodiments, in the single stator 2a, the first and center portions and the fourth annular windings 101, 102A, 104 are connected in series in the same manner as in the first embodiment. The alternating current was made to flow. This may be carried out so that the first and center portions and the fourth annular windings 101, 102A, 104 are connected in parallel so that a single-phase alternating current flows.

  Of course, a switching circuit that selectively switches the first and center portions and the fourth annular windings 101, 102A, and 104 to the serial connection or the parallel connection may be provided so as to switch according to the output of the single motor Ma. Good.

  Similarly, in the third and fourth embodiments, for each phase stator 2u, 2v, 2w of the three-phase brushless motor M, each annular winding is implemented in parallel connection, or selectively connected in series or in parallel. It may be implemented by switching to.

  In each of the above embodiments, the tip surfaces 16 and 36 of the first and third rotor side claw-shaped magnetic poles 13 and 33 are placed in contact with each other or in close proximity to each other so as to face the axial direction. This may be carried out by shifting the tip surface 16 and the tip surface 36 by a certain range in the circumferential direction and changing the center position of the magnetic pole by placing the tip surfaces 16 and 36 in contact or close to each other. . This makes it possible to adjust the flow of magnetic flux flowing through the first and third rotor-side claw-shaped magnetic poles 13 and 33, and is effective in reducing vibration.

  Similarly, the front end surfaces 26 and 46 of the second and fourth rotor side claw-shaped magnetic poles 23 and 43 are opposed to each other in the abutting proximity opposed arrangement. This may be performed by shifting the tip surface 26 and the tip surface 46 by a certain range in the circumferential direction, and changing the center position of the magnetic pole by placing the tip surfaces 26 and 46 in contact or close to each other. . As a result, the flow direction of the magnetic flux flowing through the second and fourth rotor side claw-shaped magnetic poles 23 and 43 can be adjusted, which is effective in reducing vibration.

  In each of the above embodiments, the tip surfaces 67 and 87 of the first and third stator side claw-shaped magnetic poles 64 and 84 are arranged in contact with each other or in close proximity to each other so as to face the axial direction. This may be carried out by shifting the tip surface 67 and the tip surface 87 by a certain range in the circumferential direction and changing the center position of the magnetic pole by placing these tip surfaces 67, 87 in contact or close to each other. . As a result, the flow direction of the magnetic flux flowing through the first and third stator side claw-shaped magnetic poles 64 and 84 can be adjusted, which is effective in reducing vibration.

  Similarly, the tip end faces 77 and 97 of the second and fourth stator side claw-shaped magnetic poles 74 and 94 are brought into direct contact with each other in the axial direction so as to contact each other. This may be carried out by shifting the tip surface 77 and the tip surface 97 by a certain range in the circumferential direction and changing the center position of the magnetic pole by placing the tip surfaces 77 and 97 in contact or close to each other. . As a result, the flow direction of the magnetic flux flowing through the second and fourth stator side claw-shaped magnetic poles 74 and 94 can be adjusted, which is effective in reducing vibration.

  In each of the above embodiments, the stator disposed outside the single rotor 1a is in contact with or in close proximity to the tip surfaces 67 and 87 of the first and third stator side claw-shaped magnetic poles 64 and 84. In addition, the single stator 2a is configured such that the tip surfaces 77 and 97 of the second and fourth stator side claw-shaped magnetic poles 74 and 94 are brought into contact with each other or in close proximity to each other.

  This is a conventional Landell type stator having one annular winding and two stator cores sandwiching the annular winding, and stator side claw-shaped magnetic poles of the stator cores arranged alternately in the circumferential direction. The present invention may be applied to a single motor in which the single rotor 1a of the present embodiment is disposed inside. Of course, the present invention may be applied to a single motor in which the single rotor 1a of the present embodiment is arranged inside a non-Landel-type stator (may be a multi-phase stator such as three-phase).

  Similarly, in a three-phase motor, the three-phase rotor 1 of each embodiment is arranged on the inner side of a conventional Landell-type three-phase stator or a non-Landel-type three-phase stator. The three-phase motor may be applied.

  In each of the above embodiments, the rotor disposed inside the single stator 2a is in contact with or in close proximity to the tip surfaces 16, 36 of the first and third rotor side claw-shaped magnetic poles 13, 33. The single rotor 1a was arranged so that the tip surfaces 26, 46 of the second and fourth rotor side claw-shaped magnetic poles 23, 43 were placed in contact with or in close proximity to each other.

  This is compared with a conventional Landell rotor having one field magnet and two rotor cores sandwiching the field magnet, in which the rotor-side claw-shaped magnetic poles of the rotor core are alternately arranged in the circumferential direction. In addition, the present invention may be applied to a single motor in which the single stator 2a of each embodiment is disposed inside. Of course, you may apply to the single motor which has arrange | positioned the single stator 2a of this embodiment on the outer side of the rotor which is not a Landel type | mold.

  Similarly, in the three-phase motor, the three-phase stator 2 of each embodiment is arranged outside the conventional Landell-type three-phase rotor and the non-Landel-type three-phase rotor. The three-phase motor may be applied.

  In the above embodiments, the number of claw-shaped magnetic poles of the first to fourth rotor cores 10, 20, 30, and 40 is 12, but the number may be changed as appropriate. Similarly, although the number of claw-shaped magnetic poles of the first to fourth stator cores 60, 70, 80, 90 is 12, the number may be changed as appropriate. Of course.

In each of the above embodiments, the first to fourth field magnets 51 to 54 are formed of ferrite magnets, but may be implemented by other permanent magnets such as neodymium magnets.
In each of the above embodiments, the inner rotor type single motor Ma and the inner rotor type three-phase brushless motor M are embodied. However, the outer rotor type single motor and the outer rotor type three phase are implemented. The present invention may be applied to other brushless motors.

  DESCRIPTION OF SYMBOLS 1 ... Rotor, 1a ... Rotor (single rotor), 1u ... U-phase rotor, 1v ... V-phase rotor, 1w ... W-phase rotor, 2 ... Stator, 2a ... Stator (single stator), 2u ... U-phase Stator, 2v ... V-phase stator, 2w ... W-phase stator, 10 ... first rotor core, 11 ... first rotor core base, 12 ... through hole, 13 ... first rotor side claw-shaped magnetic pole, 16 ... tip surface, 20 ... first 2 rotor cores, 21 ... second rotor core base, 22 ... through hole, 23 ... second rotor side claw-shaped magnetic pole, 26 ... tip surface, 30 ... third rotor core, 31 ... third rotor core base, 32 ... through hole, 33 ... 3rd rotor side claw-shaped magnetic pole, 34, 36 ... tip surface, 40 ... 4th rotor core, 41 ... 4th rotor core base, 42 ... through hole, 43 ... 4th rotor side claw-shaped magnetic pole, 46 ... tip surface, 51- 54 ... 1st-4th field magnet, 2A ... Center field magnet, 56-59 ... through hole, 60 ... first stator core, 61 ... first stator core base, 62 ... first cylindrical wall, 63 ... tip surface, 64 ... first stator side claw-shaped magnetic pole, 67 ... tip surface, 70 ... second stator core, 71 ... second stator core base, 72 ... second cylindrical wall, 73 ... tip surface, 74 ... second stator side claw-shaped magnetic pole, 77 ... tip surface, 80 ... third stator core , 81 ... third stator core base, 82 ... third cylindrical wall, 83 ... tip face, 84 ... third stator side claw-shaped magnetic pole, 87 ... tip face, 90 ... fourth stator core, 91 ... fourth stator core base, 92 ... Fourth cylindrical wall, 93 ... tip surface, 94 ... fourth stator side claw-shaped magnetic pole, 97 ... tip surface, 101 to 104 ... first to fourth annular windings, 102A ... central annular winding, M ... brushless motor (3-phase motor), a ... motor (single motor), O ... center axis, Iu ... U phase AC current (single phase current), Iv ... V phase AC current (single phase current), Iw ... W phase AC current Iw (single phase current) ), G: Gap, L1 to L4: Characteristic curve.

Claims (16)

Four first to fourth rotor cores, each having the same number of rotor-side claw-shaped magnetic poles extending at equal angular intervals, are laminated with field magnets in order in the axial direction,
The front end surface of the first rotor-side claw-shaped magnetic pole formed on the first rotor core and the front end surface of the third rotor-side claw-shaped magnetic pole formed on the third rotor core are contacted or closely opposed in the axial direction, and the second rotor core The front end surface of the formed second rotor side claw-shaped magnetic pole and the front end surface of the fourth rotor side claw-shaped magnetic pole formed on the fourth rotor core are contacted or closely opposed in the axial direction,
The first and third rotor side claw-shaped magnetic poles formed on the first and third rotor cores function as the first magnetic pole, and the second and fourth rotor side claw-shaped magnetic poles formed on the second and fourth rotor cores are the second. A rotor, wherein each field magnet interposed in each of the first to fourth rotor cores is magnetized in the axial direction so as to function as a magnetic pole. The rotor according to claim 1, wherein
The field magnet laminated between the first rotor core and the second rotor core has a first magnetic pole magnetized on the axial first rotor core side and a second magnetic pole magnetized on the axial second rotor core side. It has been
The field magnet laminated between the second rotor core and the third rotor core has a second magnetic pole magnetized on the second rotor core side in the axial direction and a first magnetic pole magnetized on the third rotor core side in the axial direction. It has been
The field magnet laminated between the third rotor core and the fourth rotor core has the first magnetic pole magnetized on the third rotor core side in the axial direction and the second magnetic pole magnetized on the fourth rotor core side in the axial direction. Rotor characterized by being made. The rotor according to claim 1 or 2,
Field magnets stacked between the first and second rotor cores, field magnets stacked between the second and third rotor cores, and field magnets stacked between the third and fourth rotor cores The rotor is characterized in that both magnets have the same axial length. The rotor according to claim 3, wherein
Each of the field magnets having the same length in the axial direction has the same magnetic force. The rotor according to any one of claims 1 to 4,
The lengths of the first and third rotor side claw-shaped magnetic poles in the axial direction are different lengths in a range in which the tip surfaces are in contact with or close to each other in the axial direction.
The lengths of the second and fourth rotor side claw-shaped magnetic poles in the axial direction are different from each other in a range in which front end surfaces thereof abut or face each other in the axial direction. The rotor according to any one of claims 1 to 5,
The tip surfaces of the first and third rotor side claw-shaped magnetic poles that contact or approach each other in the axial direction are shifted by a certain range in the circumferential direction,
The rotor is characterized in that the tip surfaces of the second and fourth rotor-side claw-shaped magnetic poles that are in contact with or close to each other in the axial direction are shifted by a certain range in the circumferential direction. Four first to fourth stator cores, each having the same number of stator side claw-shaped magnetic poles extending at equal angular intervals, are laminated with annular windings in order in the axial direction,
The tip surface of the first stator side claw-shaped magnetic pole formed on the first stator core and the tip surface of the third stator side claw-shaped magnetic pole formed on the third stator core are contacted or closely opposed in the axial direction, and the second stator core The tip surface of the formed second stator side claw-shaped magnetic pole and the tip surface of the fourth stator side claw-shaped magnetic pole formed on the fourth stator core are contacted or closely opposed in the axial direction,
The fluctuation cycle of the magnetic flux from the first and third stator side claw-shaped magnetic poles formed on the first and third stator cores, and the magnetic flux from the second and fourth stator side claw-shaped magnetic poles formed on the second and fourth stator cores. A stator characterized in that the direction of alternating current flowing through each annular winding interposed in each of the first to fourth stator cores is different so that the phase of the fluctuation period is 180 degrees out of phase. The stator according to claim 7,
The annular winding laminated between the first stator core and the second stator core is wound with a positive winding,
The annular winding laminated between the second stator core and the third stator core is wound in a reverse winding,
The annular winding laminated between the third stator core and the fourth stator core is wound with a positive winding,
A stator in which a single-phase current is passed through each annular winding. The stator according to claim 7 or 8,
An annular winding laminated between the first and second stator cores, an annular winding laminated between the second and third stator cores, and an annular winding laminated between the third and fourth stator cores The stator is characterized in that the wires have the same coil length. The stator according to claim 9, wherein
Each of the annular windings having the same coil length has the same number of turns. In the stator according to any one of claims 7 to 10,
The lengths in the axial direction of the first and third stator side claw-shaped magnetic poles are different lengths in a range in which the front end surfaces are in contact with or close to each other in the axial direction.
The stator is characterized in that the axial lengths of the claw-shaped magnetic poles on the second and fourth stator sides are different in a range in which the front end surfaces are in contact with each other or close to each other in the axial direction. The stator according to any one of claims 7 to 11,
The tip surfaces of the first and third stator side claw-shaped magnetic poles that are in contact with each other or close to each other in the axial direction are shifted by a certain range in the circumferential direction,
The stator is characterized in that the tip surfaces of the second and fourth stator side claw-shaped magnetic poles that are in contact with each other or close to each other in the axial direction are shifted by a certain range in the circumferential direction.   A rotor, wherein the rotor according to any one of claims 1 to 6 is laminated in the axial direction to form a U-phase rotor, a V-phase rotor, and a W-phase rotor.   A stator in which three stators according to any one of claims 7 to 12 are laminated in the axial direction to form a U-phase stator, a V-phase stator, and a W-phase stator.   A motor comprising one rotor according to any one of claims 1 to 6 and one stator according to any one of claims 7 to 12.   A motor comprising the three rotors according to claim 13 and the three stators according to claim 14.