JP6181525B2 - Rotor, three-phase rotor, motor, and motor rotation detection method - Google Patents

Description

  The present invention relates to a rotor, a three-phase rotor, a motor, and a motor rotation detection method.

  As a rotor used in a motor, a Landel-type rotor is known (for example, Patent Document 1). A motor using the rotor of this Landel type structure is called a Landel type motor.

  The Landel-type rotor includes two rotor cores combined with a plurality of claw-shaped magnetic poles in the circumferential direction, and a field magnet disposed between the two rotor cores. The claw-shaped magnetic poles are alternately arranged. To function as different magnetic poles.

  In this Landell-type rotor, interpole auxiliary magnets are arranged between adjacent claw-shaped magnetic poles to reduce the magnetic flux leakage of the rotor and improve the motor output. Similarly, a back auxiliary magnet is disposed between the back surface of each claw-shaped magnetic pole and the outer peripheral surface of the rotor core having the field magnet and the other claw-shaped magnetic pole.

JP 2012-115085 A

  By the way, there is a demand for further reduction in cost and improvement in manufacturing efficiency of a rotor with a Landel structure. Therefore, it is considered that a pair of rotor cores arranged on both sides of the field magnet is manufactured, for example, from a single electromagnetic steel sheet by press punching to reduce costs and improve manufacturing efficiency. In this case, the rotor core is thin. As the rotor core becomes thinner, it becomes more and more difficult to dispose the interpole auxiliary magnet between the thinned claw-shaped magnetic poles.

Therefore, it is desired to control the leakage magnetic flux (short-circuit magnetic flux) between different adjacent claw-shaped magnetic poles by using a new means instead of the inter-pole auxiliary magnet disposed between the adjacent claw-shaped magnetic poles.
The present invention has been made in order to solve the above-described problem, and its object is to replace a magnetic flux leakage between adjacent claw-shaped magnetic poles in place of the inter-pole auxiliary magnet disposed between the claw-shaped magnetic poles. Is to provide a rotor, a three-phase rotor, a motor, and a rotation detection method of the motor.

A rotor for solving the above problems includes a field magnet magnetized in the axial direction, a first rotor core base disposed on one side of the field magnet in the axial direction, and the like on the outer periphery of the first rotor core base, etc. A first rotor core formed by bending and extending a plurality of first claw-shaped magnetic poles to the axial field magnet side at intervals, and a second rotor core base disposed on the other axial side of the field magnet, the second A plurality of second claw-shaped magnetic poles are formed on the outer peripheral portion of the rotor core base at equal intervals by being bent toward the axial field magnet side, and each second claw-shaped magnetic pole is formed on each corresponding one of the first rotor cores. A rotor having a second rotor core disposed between the one claw-shaped magnetic poles, wherein the field magnet causes the first claw-shaped magnetic pole to function as the first magnetic pole and the second claw-shaped magnetic pole to function as the second magnetic pole. The first claw-shaped magnetic poles of the first rotor core The second claw-shaped magnetic poles are connected to each other by the annular first annular auxiliary magnet having a plurality of first magnet portions for controlling the leakage magnetic flux with respect to the second claw-shaped magnetic poles adjacent in the circumferential direction. The magnetic poles are connected by an annular second annular auxiliary magnet having a plurality of second magnet portions for controlling leakage flux with respect to the first claw-shaped magnetic poles adjacent in the circumferential direction, and the first annular auxiliary magnet is The first claw-shaped magnetic poles are fixed to the outside of the bent portions of the first claw-shaped magnetic poles, and are in contact with the tip portions of the second claw-shaped magnetic poles of the second rotor core disposed between the adjacent first claw-shaped magnetic poles The second annular auxiliary magnet is fixed to the outside of the bent portion of each of the second claw-shaped magnetic poles, and the first rotor core first disposed relatively between the adjacent second claw-shaped magnetic poles. It is in contact with the tip of the claw-shaped magnetic pole .

  According to the rotor, the leakage magnetic flux between the adjacent different claw-shaped magnetic poles can be controlled, the first and second annular auxiliary magnets can be easily assembled, and the centrifugal force accompanying the rotation can be reduced. There is no risk of jumping out.

In the rotor, the first annular auxiliary magnet, wherein it also to the Ru is adhered and fixed to the cut out surface of the outer corners of the bent portions of the first claw-shaped magnetic poles, the second annular auxiliary magnet, each it is preferable that is adhesively fixed to the notched surface of the outer corner portion of the bent portion of the second claw-shaped magnetic poles.

According to the rotor, leakage magnetic flux between adjacent claw-shaped magnetic poles can be controlled more accurately without increasing the size of the rotor.
In the rotor, the first annular auxiliary magnet is formed with a first magnet portion that controls a leakage magnetic flux that is equally divided by the number of the first claw-shaped magnetic poles and the second claw-shaped magnetic poles in the circumferential direction. It is preferable that the second annular auxiliary magnet is formed with a second magnet portion that controls a leakage magnetic flux that is equally divided by the number of the first claw-shaped magnetic poles and the second claw-shaped magnetic poles in the circumferential direction.

According to the above rotor, the leakage magnetic flux between adjacent claw-shaped magnetic poles can be controlled with higher accuracy.
In the rotor, each first magnet portion of the first annular auxiliary magnet is magnetized in the circumferential direction, and each second magnet portion of the second annular auxiliary magnet is magnetized in the circumferential direction. It is preferable.

According to the above rotor, the leakage magnetic flux between adjacent claw-shaped magnetic poles can be controlled with higher accuracy.
In the rotor, in the first annular auxiliary magnet, a boundary that divides each first magnet portion may be a circumferential center position of each first claw-shaped magnetic pole or a circumferential center position of each second claw-shaped magnetic pole. The second annular auxiliary magnet is fixed to the first rotor core so as to coincide with each other, and the boundary that divides each second magnet part is the circumferential center position of each first claw-shaped magnetic pole or the above-mentioned It is preferable that the second claw-shaped magnetic pole is fixed to the second rotor core so as to coincide with the circumferential center position of each second claw-shaped magnetic pole.

According to the above rotor, the leakage magnetic flux between adjacent claw-shaped magnetic poles can be controlled with higher accuracy.
In the rotor, each first magnet portion of the first annular auxiliary magnet has a boundary side coincident with a circumferential center position of the first claw-shaped magnetic pole as a first magnetic pole, and a circumferential center of the second claw-shaped magnetic pole. The second magnet portion of the second annular auxiliary magnet is magnetized so that the boundary side that coincides with the position becomes the second magnetic pole, and the boundary side that coincides with the circumferential center position of the first claw-shaped magnetic pole It is preferable that the first magnetic pole is magnetized so that the boundary side coincident with the circumferential center position of the second claw-shaped magnetic pole becomes the second magnetic pole.

  According to the rotor, leakage magnetic flux (short-circuit magnetic flux) from the first claw-shaped magnetic pole to the second claw-shaped magnetic pole can be reduced by the first and second magnet portions of the first and second annular auxiliary magnets. The motor output can be increased.

Rotor for solving the above problems, and the field magnet which is magnetized in the axial direction, the first rotor core base is located in one axial side of the field magnet, the outer periphery of the first rotor core base, etc. A first rotor core formed by bending and extending a plurality of first claw-shaped magnetic poles to the axial field magnet side at intervals, and a second rotor core base disposed on the other axial side of the field magnet, the second A plurality of second claw-shaped magnetic poles are formed at the outer peripheral portion of the rotor core base at equal intervals by being bent toward the axial field magnet side, and each second claw-shaped magnetic pole is formed on each of the corresponding first rotor cores. A rotor having a second rotor core disposed between the first claw-shaped magnetic poles, wherein the first claw-shaped magnetic pole functions as the first magnetic pole and the second claw-shaped magnetic pole functions as the second magnetic pole in the field magnet. Each first claw-shaped magnetic pole of the first rotor core The second claw of the second rotor core is connected to the second claw-shaped magnetic poles adjacent to each other in the circumferential direction by an annular first annular auxiliary magnet having a plurality of first magnet portions for controlling leakage magnetic flux. The first annular auxiliary magnets are connected to each other by an annular second annular auxiliary magnet having a plurality of second magnet parts for controlling leakage magnetic flux with respect to the first claw-like magnetic poles adjacent in the circumferential direction. Is formed with a first magnet portion for controlling a leakage magnetic flux that is equally divided by the number of the first claw-shaped magnetic poles and the second claw-shaped magnetic poles in the circumferential direction, and the second annular auxiliary magnet is formed in the circumferential direction. A second magnet part for controlling leakage magnetic flux that is equally divided by the number of the first claw-like magnetic poles and the second claw-like magnetic poles, and each first magnet part of the first annular auxiliary magnet is The second magnet portion of the second annular auxiliary magnet is magnetized in the circumferential direction. In the first annular auxiliary magnet, the boundary that divides each first magnet portion is a circumferential center position of each first claw-shaped magnetic pole or a circumferential center of each second claw-shaped magnetic pole. The second annular auxiliary magnet is fixed to the first rotor core so as to coincide with the position, and the boundary that divides each second magnet portion is the center position in the circumferential direction of each first claw-shaped magnetic pole. Alternatively, the second claw-shaped magnetic poles are fixed to the second rotor core so as to coincide with the circumferential center positions of the second claw-shaped magnetic poles, and the first magnet portions of the first annular auxiliary magnets Is magnetized so that the boundary side coinciding with the center position in the circumferential direction is the first magnetic pole and the boundary side coinciding with the center position in the circumferential direction of the first claw-shaped magnetic pole is the second magnetic pole, Each second magnet portion of the auxiliary magnet matches the circumferential center position of the second claw-shaped magnetic pole. The boundary side of the first magnetic pole, the boundary side that coincides with the circumferential center positions of the first claw-shaped magnetic pole such that the second magnetic pole, that is magnetized.

According to the rotor , the leakage magnetic flux between the adjacent different claw-shaped magnetic poles can be controlled, the first and second annular auxiliary magnets can be easily assembled, and the centrifugal force accompanying the rotation can be reduced. There is no risk of jumping out. Moreover, the leakage magnetic flux between adjacent claw-shaped magnetic poles can be controlled with higher accuracy.
Further, the first and second magnet portions of the first and second annular auxiliary magnets can increase the leakage magnetic flux (short-circuit magnetic flux) from the first claw-shaped magnetic pole to the second claw-shaped magnetic pole, thereby increasing the motor. It can be driven at the rotational speed.

Rotor for solving the above problems, and the field magnet which is magnetized in the axial direction, the first rotor core base is located in one axial side of the field magnet, the outer periphery of the first rotor core base, etc. A first rotor core formed by bending and extending a plurality of first claw-shaped magnetic poles to the axial field magnet side at intervals, and a second rotor core base disposed on the other axial side of the field magnet, the second A plurality of second claw-shaped magnetic poles are formed at the outer peripheral portion of the rotor core base at equal intervals by being bent toward the axial field magnet side, and each second claw-shaped magnetic pole is formed on each of the corresponding first rotor cores. A rotor having a second rotor core disposed between the first claw-shaped magnetic poles, wherein the first claw-shaped magnetic pole functions as the first magnetic pole and the second claw-shaped magnetic pole functions as the second magnetic pole in the field magnet. Each first claw-shaped magnetic pole of the first rotor core The second claw of the second rotor core is connected to the second claw-shaped magnetic poles adjacent to each other in the circumferential direction by an annular first annular auxiliary magnet having a plurality of first magnet portions for controlling leakage magnetic flux. The first annular auxiliary magnets are connected to each other by an annular second annular auxiliary magnet having a plurality of second magnet parts for controlling leakage magnetic flux with respect to the first claw-like magnetic poles adjacent in the circumferential direction. Is formed with a first magnet portion for controlling a leakage magnetic flux that is equally divided by the number of the first claw-shaped magnetic poles and the second claw-shaped magnetic poles in the circumferential direction, and the second annular auxiliary magnet is formed in the circumferential direction. A second magnet part for controlling leakage magnetic flux that is equally divided by the number of the first claw-like magnetic poles and the second claw-like magnetic poles, and each first magnet part of the first annular auxiliary magnet is Each second magnet portion of the second annular auxiliary magnet is magnetized in the axial direction. And Ru der things are.

According to the rotor , the leakage magnetic flux between the adjacent different claw-shaped magnetic poles can be controlled, the first and second annular auxiliary magnets can be easily assembled, and the centrifugal force accompanying the rotation can be reduced. There is no risk of jumping out. Moreover, the leakage magnetic flux between adjacent claw-shaped magnetic poles can be controlled with higher accuracy.
In the rotor, in the first annular auxiliary magnet, a boundary that divides each first magnet portion is aligned with a circumferential intermediate position between each first claw-shaped magnetic pole and each second claw-shaped magnetic pole. The second annular auxiliary magnet is fixed to the first rotor core, and the boundary between the second claw-shaped magnetic poles is the middle in the circumferential direction between the first claw-shaped magnetic poles and the second claw-shaped magnetic poles. It is preferable that the second rotor core is fixed so as to coincide with the position.

According to the above rotor, the leakage magnetic flux between adjacent claw-shaped magnetic poles can be controlled with higher accuracy.
In the rotor, each first magnet portion of the first annular auxiliary magnet, which is opposed to the first claw-shaped magnetic pole, has the first magnetic pole on the second rotor core side in the axial direction, and the first magnet portion. The first magnet portion that is magnetized so that the first rotor core side becomes the second magnetic pole and faces the second claw-shaped magnetic pole has the second rotor core side as the second magnetic pole and the first rotor core side as the first in the axial direction. Each of the second magnet portions of the second annular auxiliary magnet that is magnetized by the magnetic poles, the second magnet portion facing the second claw-shaped magnetic poles, the first magnetic pole on the second rotor core side in the axial direction, The second magnet portion that is magnetized so that the first rotor core side becomes the second magnetic pole and faces the first claw-shaped magnetic pole has the second rotor core side as the second magnetic pole and the first rotor core side as the second magnetic pole in the axial direction. It is preferable that one magnetic pole is magnetized.

  According to the rotor, leakage magnetic flux (short-circuit magnetic flux) from the first claw-shaped magnetic pole to the second claw-shaped magnetic pole can be reduced by the first and second magnet portions of the first and second annular auxiliary magnets. The motor output can be increased.

In the rotor, each first magnet portion of the first annular auxiliary magnet, which is opposed to the first claw-shaped magnetic pole, has the second magnetic pole on the second rotor core side in the axial direction, and the first magnet portion. The first magnet portion that is magnetized so that the first rotor core side becomes the first magnetic pole and faces the second claw-shaped magnetic pole has an axial direction in which the second rotor core side is the first magnetic pole, and the first rotor core side is the second magnetic pole. Magnetized by the magnetic pole,
Each of the second magnet portions of the second annular auxiliary magnet, the second magnet portion facing the second claw-shaped magnetic pole, has the second rotor core side as the second magnetic pole and the first rotor core side as the second rotor portion in the axial direction. The second magnet portion that is magnetized to become the first magnetic pole and faces the first claw-shaped magnetic pole is magnetized in the axial direction with the second rotor core side as the first magnetic pole and the first rotor core side as the second magnetic pole. It is preferable.

  According to the above rotor, the leakage magnetic flux (short-circuit magnetic flux) from the first claw-shaped magnetic pole to the second claw-shaped magnetic pole can be increased by the first and second magnet portions of the first and second annular auxiliary magnets. The motor can be driven at a high rotational speed.

In the three-phase rotor for solving the above-described problems, any one of the above rotors is stacked in the axial direction to form a U-phase rotor, a V-phase rotor, and a W-phase rotor.
According to the above three-phase rotor, it is possible to control the leakage magnetic flux between adjacent different claw-shaped magnetic poles, and the first and second annular auxiliary magnets can be easily assembled, and the rotation is accompanied. There is no risk of jumping out by centrifugal force.

A motor for solving the above problems includes the rotor or the three-phase rotor.
According to the motor, the leakage magnetic flux between adjacent claw-shaped magnetic poles can be controlled, the first and second annular auxiliary magnets can be easily assembled, and the centrifugal force accompanying rotation can be reduced. There is no risk of jumping out.

  In order to solve the above-described problem, the rotation detection method of the motor including the rotor or the three-phase rotor is configured such that the magnet is positioned at a position adjacent to at least one of the first annular auxiliary magnet and the second annular auxiliary magnet. A detector is disposed, and the rotation of the motor is detected by detecting the passage of each magnet portion of the annular auxiliary magnet rotating with the rotation of the rotor or the three-phase rotor by the same magnetic detector.

  According to the motor, a member to be detected for detecting the rotation angle and the number of rotations of the motor can also be used, and the number of parts can be reduced.

  According to the present invention, it is possible to control the leakage magnetic flux between adjacent claw-shaped magnetic poles.

The perspective view of the motor of a 1st embodiment. Similarly, the front view seen from the axial direction of the motor. Similarly, AA-A line combination sectional view of FIG. Similarly, the perspective view of a rotor. Similarly, the exploded perspective view of a rotor. Similarly, the perspective view of the 1st and 2nd annular auxiliary magnet. Similarly, the principal part expanded sectional perspective view of a rotor. Similarly, the perspective view of a stator. Similarly, an exploded perspective view of a stator. Similarly, the induced voltage characteristic curve figure for demonstrating the output characteristic of a motor. Similarly, explanatory drawing for demonstrating rotation detection of the motor using the 1st annular auxiliary magnet of a 1st embodiment. Similarly, the detection waveform figure of the leakage magnetic flux which a magnetic detector detects. The principal part expanded sectional perspective view of the rotor of 2nd Embodiment. Similarly, the induced voltage characteristic curve figure for demonstrating the output characteristic of a motor. Similarly, explanatory drawing for demonstrating rotation detection of the motor using the 1st annular auxiliary magnet of a 2nd embodiment. Similarly, the detection waveform figure of the leakage magnetic flux which a magnetic detector detects. The principal part expanded sectional perspective view of the rotor of 3rd Embodiment. Similarly, the induced voltage characteristic curve figure for demonstrating the output characteristic of a motor. The principal part expanded sectional perspective view of the rotor of 4th Embodiment. Similarly, the induced voltage characteristic curve figure for demonstrating the output characteristic of a motor. Similarly, explanatory drawing for demonstrating rotation detection of the motor using the 1st annular auxiliary magnet of 4th Embodiment. Similarly, the detection waveform figure of the leakage magnetic flux which a magnetic detector detects. The perspective view of the three-phase brushless motor explaining another example. Similarly, the front view seen from the radial direction of the three-phase rotor. Similarly, sectional drawing of a three-phase stator.

(First embodiment)
Hereinafter, a first embodiment of a motor will be described with reference to FIGS.
As shown in FIGS. 1 and 2, a brushless motor 1 includes a rotor 2 fixed to a rotating shaft (not shown), and an annular stator 3 disposed outside the rotor 2 and fixed to a motor housing (not shown). And have. A rotating shaft (not shown) is rotatably supported by a bearing attached to a motor housing (not shown).

(Rotor 2)
As shown in FIGS. 4 and 5, the rotor 2 includes first and second rotor cores 11, 21, a field magnet 31, and first and second annular auxiliary magnets 41 and 51.

(First rotor core 11)
As shown in FIGS. 3 and 5, the first rotor core 11 has a first rotor core base 14 made of an electromagnetic steel plate formed in a disk shape. A through hole 11a is formed at the center position of the first rotor core base 14 for passing through and fixing a rotating shaft (not shown).

  Further, twelve identically-shaped first rotor-side claw-shaped magnetic poles 15 projecting radially outward and bent at the tips thereof on the outer peripheral surface 14c of the first rotor core base 14 in the axial direction. It extends to the rotor core 21 side.

  As shown in FIG. 3, in the first rotor-side claw-shaped magnetic pole 15, the portion protruding radially outward from the outer peripheral surface 14 c of the first rotor core base 14 has its thickness (length in the axial direction) changed to the first rotor core. It is formed thicker than the plate thickness (length in the axial direction) of the base 14 to form the first step portion 15d. The first step portion 15d is formed to be thick on the second rotor core 21 side, and a horizontal surface on the anti-second rotor core 21 side (hereinafter referred to as a first back surface 15m) is opposite to the first rotor core base 14. It is flush with the facing surface 14b.

  The first step surface 15e formed on the radially inner side of the first step portion 15d is concentric with the outer peripheral surface 14c of the first rotor core base 14 with the center axis O of the rotation shaft (not shown) as the center when viewed from the axial direction. It is the circular arc surface which makes.

  The first rotor-side claw-shaped magnetic pole 15 is formed by extending the first magnetic pole portion 15f from the radially outer end of the first step portion 15d to the axial second rotor core 21 side. The circumferential end surfaces 15a and 15b of the first rotor-side claw-shaped magnetic pole 15 composed of the first step portion 15d and the first magnetic pole portion 15f are both flat surfaces and approach each other toward the tip.

  That is, the shape when the first step portion 15d is viewed from the axial direction is a trapezoidal shape that becomes narrower as it goes radially outward, and the shape when the first magnetic pole portion 15f is viewed from the radial direction is the tip. The trapezoidal shape becomes narrower.

  The first magnetic pole portion 15f of the first rotor-side claw-shaped magnetic pole 15 has a fan-shaped cross section in the direction perpendicular to the axis, and the radially outer side surface 15j and the inner side surface 15k of the first magnetic pole portion 15f extend from the axial direction. As seen, this is a circular arc surface that is concentric with the outer peripheral surface 14 c of the first rotor core base 14 with the central axis O as the center.

  The angle in the circumferential direction of each first rotor-side claw-shaped magnetic pole 15, that is, the angle between the circumferential end surfaces 15 a and 15 b and the central axis O of the rotating shaft (not shown) is determined by the adjacent first rotor-side claw. Is set smaller than the angle of the gap between the magnetic pole 15 and the first rotor-side claw-shaped magnetic pole 15.

(Second rotor core 21)
As shown in FIG. 5, the second rotor core 21 is the same material and shape as the first rotor core 11, and is rotated at the center position of the second rotor core base 24 made of an electromagnetic steel plate formed in a disc shape. A through hole 21a for penetrating and fixing a shaft (not shown) is formed.

  In addition, on the outer peripheral surface of the second rotor core base 24, twelve second rotor-side claw-like magnetic poles 25 having the same shape are projected radially outward and the tip thereof is bent to be axially first. It extends to the rotor core 11 side.

  As shown in FIG. 3, in the second rotor-side claw-shaped magnetic pole 25, the portion that protrudes radially outward from the outer peripheral surface 24 c of the second rotor core base 24 has the thickness (length in the axial direction) of the second rotor core. It is formed thicker than the plate thickness (length in the axial direction) of the base 24 to form the second step portion 25d. The second step portion 25d is formed to be thick on the first rotor core 11 side, and a horizontal surface on the side opposite to the first rotor core 11 (hereinafter referred to as second back surface 25m) is opposite to the second rotor core base 24. It is flush with the facing surface 24b.

  The second step surface 25e formed on the radially inner side of the second step portion 25d is an arc surface that is concentric with the outer peripheral surface 24c of the second rotor core base 24 with the center axis O as the center when viewed from the axial direction. is there.

  The second rotor-side claw-shaped magnetic pole 25 is formed by extending the second magnetic pole portion 25f from the radially outer end of the second step portion 25d to the axial first rotor core 11 side. The circumferential end surfaces 25a and 25b of the second rotor-side claw-shaped magnetic pole 25 composed of the second step portion 25d and the second magnetic pole portion 25f are both flat surfaces and approach each other toward the tip.

  That is, the shape when the second step portion 25d is viewed from the axial direction is a trapezoidal shape that becomes narrower toward the outside in the radial direction, and the shape when the second magnetic pole portion 25f is viewed from the radial direction is the tip. The trapezoidal shape becomes narrower.

  The second magnetic pole portion 25f of the second rotor-side claw-shaped magnetic pole 25 has a fan-shaped cross section in the direction perpendicular to the axis, and the radially outer surface 25j and the inner side surface 25k of the second magnetic pole portion 25f extend from the axial direction. As seen, this is a circular arc surface that is concentric with the outer peripheral surface 14 c of the first rotor core base 14 with the central axis O as the center.

  The angle in the circumferential direction of each second rotor-side claw-shaped magnetic pole 25, that is, the angle between the circumferential end surfaces 25a and 25b and the central axis O of the rotating shaft (not shown) is determined by the adjacent second rotor-side claw. Is set smaller than the angle of the gap between the claw-shaped magnetic pole 25 and the claw-shaped magnetic pole 25 on the second rotor side.

  In the second rotor core 21, the claw-shaped magnetic pole 25 on the second rotor side of the second rotor core 21 is claw-shaped magnetic pole 15 on the first rotor side of the first rotor core 11 when viewed from the axial direction. The arrangement is fixed so as to be located between them. At this time, the second rotor core 21 is assembled to the first rotor core 11 such that the field magnet 31 is arranged between the first rotor core 11 and the second rotor core 21 in the axial direction.

(Field magnet 31)
As shown in FIG. 5, the field magnet 31 is a disk-like permanent magnet made of a ferrite magnet in the present embodiment, and a through hole 32 penetrating a rotating shaft (not shown) is provided at the center position thereof. Is formed. Then, one side surface 33 of the field magnet 31 is in contact with the opposing surface 14a of the first rotor core base 14 and the other side surface 34 of the field magnet 31 is in contact with the opposing surface 24a of the second rotor core base 24. The magnet 31 is sandwiched and fixed between the first rotor core 11 and the second rotor core 21.

The outer diameter of the field magnet 31 is set to coincide with the outer diameters of the first and second rotor core bases 14 and 24 (outer peripheral surfaces 14c and 24c).
Therefore, when the field magnet 31 is sandwiched between the first rotor core base 14 and the second rotor core base 24, the first and second claw-shaped magnetic poles 15 and 25 of the first and second rotor-side claw-shaped magnetic poles 15 and 25 are respectively shown in FIG. The first and second step surfaces 15 e and 25 e of the two step portions 15 d and 25 d abut on the outer peripheral surface 35 of the field magnet 31.

  The thickness (length in the axial direction) of the field magnet 31 is set to a predetermined thickness. In the present embodiment, as shown in FIG. 3, the first and second rotor side claw-shaped magnetic poles 15, 25 have tip surfaces 15 c, 25 c which are opposed surfaces 14 a of the first and second rotor core bases 14, 24, respectively. , 24a and the same length.

  As shown in FIG. 3, the field magnet 31 is magnetized (magnetized) in the axial direction, and is magnetized so that the first rotor core 11 side is an N pole and the second rotor core 21 side is an S pole. ing. Therefore, by this field magnet 31, the first rotor side claw-shaped magnetic pole 15 of the first rotor core 11 functions as an N pole (first magnetic pole), and the second rotor side claw-shaped magnetic pole 25 of the second rotor core 21 functions as an S pole. It functions as (second magnetic pole).

  The thus configured rotor 2 is a so-called Landel-type rotor using the field magnet 31. The rotor 2 has first rotor-side claw-shaped magnetic poles 15 that are N poles and second rotor-side claw-shaped magnetic poles 25 that are S poles alternately arranged in the circumferential direction, and the number of magnetic poles is 24 (a number of pole pairs). 12) rotors.

(First annular auxiliary magnet 41)
As shown in FIGS. 4 and 5, a first annular auxiliary magnet 41 is fixed to the first rotor core 11 on the side opposite to the second rotor core 21.

  More specifically, as shown in FIG. 3 and FIG. 5, in each first rotor side claw-shaped magnetic pole 15 of the first rotor core 11, a horizontal first back surface 15 m on the side opposite to the second rotor core 21 of the first step portion 15 d An edge at which the outer surface 15j of the first magnetic pole portion 15f made of an arc surface intersects is cut out in a shape of an isosceles triangle at right angles to form a first connection surface f1. Here, the length of two sides sandwiching the oblique side in the isosceles triangle having a right-angled cross section coincides with the axial thickness of the first rotor core base 14. And the 1st connection surface f1 formed in each 1st rotor side nail | claw-shaped magnetic pole 15 is formed in the conical surface centering on the central axis O from the outer surface 15j being a circular arc surface.

The first annular auxiliary magnet 41 is bonded and fixed to the first connecting surface f1 of each of the first rotor side claw-shaped magnetic poles 15 with an adhesive.
As shown in FIGS. 3 and 5, the first annular auxiliary magnet 41 is a permanent magnet made of a ferrite magnet formed in an annular shape. The first annular auxiliary magnet 41 has a cross-sectional right isosceles triangular shape that is the same cross-sectional shape as when the above-mentioned edge is cut into a right-angled isosceles triangle, and the hypotenuse of the right-angled isosceles triangle is the first. An inner side surface 41 a of the single annular auxiliary magnet 41 is formed.

  Therefore, the inner side surface 41 a of the first annular auxiliary magnet 41 is formed in a conical surface with the central axis O as the center. Then, the inner side surface 41a of the first annular auxiliary magnet 41 is bonded and fixed to the first connection surface f1 of each first rotor-side claw-shaped magnetic pole 15 with an adhesive at a predetermined pitch.

  When the first annular auxiliary magnet 41 is bonded and fixed to each claw-shaped magnetic pole 15 on the first rotor side, the radially outer surface 41b of the first annular auxiliary magnet 41 is flush with the outer surface 15j of the first magnetic pole portion 15f. Become. The axially outer side surface 41c of the first annular auxiliary magnet 41 is flush with the horizontal first back surface 15m on the side opposite to the second rotor core 21 of the first step portion 15d.

  At this time, the front end surface 25 c of the second magnetic pole portion 25 f that is relatively disposed between the first rotor-side claw-shaped magnetic pole 15 and the first rotor-side claw-shaped magnetic pole 15 in the circumferential direction is The radial outer side surface 41b and the inner side surface 41a come into contact with the intersecting edge portion.

  As shown in FIG. 6, the first annular auxiliary magnet 41 has 24 pieces that are equally divided in the circumferential direction by the number of the first rotor side claw-shaped magnetic poles 15 and the number of second rotor side claw-shaped magnetic poles 25 (24). A first magnet portion 42 is formed.

  As shown in FIG. 7, the first annular auxiliary magnet 41 has a boundary between the first magnet portion 42 and the first magnet portion 42, and the first magnetic pole portion 15 f of the first rotor-side claw-shaped magnetic pole 15. Is arranged with respect to the first rotor core 11 so as to coincide with the circumferential center position of the second rotor side claw-shaped magnetic pole 25 or the circumferential center position of the second magnetic pole portion 25f of each second rotor side claw-shaped magnetic pole 25.

  As shown in FIGS. 6 and 7, the first annular auxiliary magnet 41 arranged in this manner is magnetized (magnetized) in the circumferential direction in each first magnet portion 42, and each first magnet portion 42. Are magnetized (magnetized) so that the first magnetic pole portion 15f side is an N pole and the second magnetic pole portion 25f side is an S pole.

  That is, the N poles of the first magnet portions 42 are arranged at the base end portions of the first magnetic pole portions 15 f of the first rotor-side claw-shaped magnetic poles 15, respectively. The S poles of the first magnet portions 42 are arranged at the tip portions of the second magnetic pole portions 25f of the second rotor-side claw-shaped magnetic poles 25, respectively.

As a result, the leakage magnetic flux (short-circuit magnetic flux) from the proximal end portion of the N-pole first magnetic pole portion 15f to the distal end portion of the S-pole second magnetic pole portion 25f is reduced.
(Second annular auxiliary magnet 51)
As shown in FIGS. 4 and 5, the second annular auxiliary magnet 51 is fixed to the second rotor core 21 on the side opposite to the first rotor core 11.

  More specifically, as shown in FIGS. 3 and 5, each second rotor-side claw-shaped magnetic pole 25 of the second rotor core 21 has a horizontal second back surface 25 m on the side opposite to the first rotor core 11 of the second stepped portion 25 d. An edge that intersects the outer surface 25j of the second magnetic pole portion 25f made of an arcuate surface is cut out in a shape of an isosceles triangle at right angles to form a second connecting surface f2. Here, the length of two sides sandwiching the hypotenuse in the isosceles triangle having a right-angled cross section coincides with the thickness of the second rotor core base 24 in the axial direction. And the 2nd connection surface f2 formed in each 2nd rotor side nail | claw-shaped magnetic pole 25 is formed in the conical surface centering on the central axis O from the outer surface 25j being a circular arc surface.

The second annular auxiliary magnet 51 is bonded and fixed to the second connection surface f2 of each of the second rotor side claw-shaped magnetic poles 25 with an adhesive.
As shown in FIGS. 3 and 5, the second annular auxiliary magnet 51 is a permanent magnet made of a ferrite magnet formed in an annular shape. The first annular auxiliary magnet 41 has a cross-sectional right isosceles triangular shape that is the same cross-sectional shape as when the above-mentioned edge is cut into a right-angled isosceles triangle, and the hypotenuse of the right-angled isosceles triangle is the first. An inner side surface 51 a of the two annular auxiliary magnets 51 is formed.

  Therefore, the inner side surface 51 a of the second annular auxiliary magnet 51 is formed in a conical surface with the central axis O as the center. Then, the inner side surface 51a of the second annular auxiliary magnet 51 is bonded and fixed to the second connection surface f2 of each claw-shaped magnetic pole 25 on the second rotor side with an adhesive at a predetermined pitch.

  When the second annular auxiliary magnet 51 is bonded and fixed to each claw-shaped magnetic pole 25 on the second rotor side, the radially outer surface 51b of the second annular auxiliary magnet 51 is flush with the outer surface 25j of the second magnetic pole portion 25f. Become. The axially outer surface 51c of the second annular auxiliary magnet 51 is flush with the horizontal second back surface 25m on the side opposite to the first rotor core 11 of the second step portion 25d.

  At this time, the front end surface 15 c of the first magnetic pole portion 15 f that is relatively disposed between the second rotor-side claw-shaped magnetic pole 25 and the second rotor-side claw-shaped magnetic pole 25 in the circumferential direction is formed by the second annular auxiliary magnet 51. The radially outer surface 51b and the inner surface 51a come into contact with the intersecting edge portion.

  As shown in FIG. 6, the second annular auxiliary magnet 51 has 24 pieces that are equally divided in the circumferential direction by the number of the first rotor-side claw-shaped magnetic poles 15 and the number of the second rotor-side claw-shaped magnetic poles 25 (24). A second magnet portion 52 is formed.

  As shown in FIG. 7, the second annular auxiliary magnet 51 has a boundary between the second magnet portion 52 and the second magnet portion 52, and the second magnetic pole portion 25 f of the second rotor-side claw-shaped magnetic pole 25. Is arranged with respect to the second rotor core 21 so as to coincide with the circumferential center position of the first magnetic pole portion 15f of the first rotor side claw-shaped magnetic pole 15.

  As shown in FIGS. 6 and 7, the second annular auxiliary magnet 51 arranged in this manner is magnetized (magnetized) in the circumferential direction in each second magnet portion 52, and each second magnet portion 52. Are magnetized (magnetized) so that the first magnetic pole portion 15f side is an N pole and the second magnetic pole portion 25f side is an S pole.

  That is, the S pole of each second magnet portion 52 is disposed at the base end portion of the second magnetic pole portion 25 f of each second rotor-side claw-shaped magnetic pole 25. Further, the N poles of the respective second magnet portions 52 are arranged at the tip portions of the first magnetic pole portions 15 f of the respective first rotor side claw-shaped magnetic poles 15.

As a result, the leakage magnetic flux (short-circuit magnetic flux) from the distal end portion of the N-pole first magnetic pole portion 15f to the proximal end portion of the S-pole second magnetic pole portion 25f is reduced.
(Starter 3)
The stator 3 disposed on the outer side in the radial direction of the rotor 2 includes first and second stator cores 61 and 71 and a coil portion 81 as shown in FIGS.

(First stator core 61)
As shown in FIG. 9, the first stator core 61 has an annular plate-shaped first stator core base 64 made of an electromagnetic steel plate. The first stator core base 64 having an annular plate shape is bent at the outer peripheral portion toward the second stator core 71 to form a first stator-side cylindrical wall 64e. An annular front end surface 64 f of the first stator side cylindrical wall 64 e faces the second stator core 71. The length in the axial direction of the first stator side cylindrical wall 64e is half the length in the axial direction of the rotor of each phase.

  On the inner peripheral surface 64d of the first stator core base 64, twelve first stator side claw-shaped magnetic poles 65 are projected radially inwardly, and their tips are bent toward the second stator core 71 in the axial direction. ing.

  Here, in the first stator side claw-shaped magnetic pole 65, a portion protruding radially inward from the inner peripheral surface 64d of the first stator core base 64 is called a first stator side base portion 65g, and a tip portion bent in the axial direction is called a first stator side base portion 65g. This is referred to as a first stator side magnetic pole portion 65h. The first stator side claw-shaped magnetic pole 65 before the first stator side magnetic pole portion 65h is bent is formed in a trapezoidal shape that tapers toward the tip when viewed from the axial direction.

  That is, the shape when the first stator side base portion 65g is viewed from the axial direction is a trapezoidal shape that becomes narrower as it goes radially inward, and the shape when the first stator side magnetic pole portion 65h is viewed from the radial direction. Has a trapezoidal shape that becomes narrower toward the tip. The circumferential end surfaces 65a and 65b of the first stator side claw-shaped magnetic pole 65 composed of the first stator side base portion 65g and the first stator side magnetic pole portion 65h are both flat surfaces and approach each other toward the tip. Become.

  Thereby, the cross-sectional area of the cross section obtained by cutting the first stator side base portion 65g in the axial direction when viewed from the radial direction becomes smaller as it goes inward in the radial direction. Moreover, the cross-sectional area of the cross section obtained by cutting the first stator-side magnetic pole portion 65h in the radial direction as viewed from the axial direction becomes smaller as it goes to the tip side.

  The first stator-side magnetic pole portion 65h bent in the axial direction has a fan-shaped cross section in the direction perpendicular to the axis, and its radially outer surface 65j and inner surface 65k are centered when viewed from the axial direction. This is a circular arc surface concentric with the inner peripheral surface 64d of the first stator core base 64 around the axis O.

  The circumferential angle of the first stator side base portion 65g of each first stator side claw-shaped magnetic pole 65, that is, the angle formed between the base end portions of the circumferential end surfaces 65a and 65b and the central axis O of the rotation shaft (not shown). Is set smaller than the angle of the gap between the proximal ends of the first stator side base portions 65g of the adjacent first stator side claw-shaped magnetic poles 65.

(Second stator core 71)
As shown in FIG. 9, the second stator core 71 has an annular plate-shaped second stator core base 74 made of an electromagnetic steel plate having the same material and shape as the first stator core base 64. An annular plate-shaped second stator core base 74 is formed with a second stator side cylindrical wall 74e formed by bending the outer peripheral portion thereof toward the first stator core 61 side. The annular front end surface 74f of the second stator side cylindrical wall 74e faces the front end surface 64f of the first stator side cylindrical wall 64e. The length in the axial direction of the second stator side cylindrical wall 74e is half the length in the axial direction of the rotor of each phase.

  On the inner peripheral surface 74d of the second stator core base 74, twelve second stator side claw-shaped magnetic poles 75 are protruded radially inwardly and bent at the tips thereof toward the first stator core 61 in the axial direction. ing.

  Here, in the second stator side claw-shaped magnetic pole 75, a portion protruding radially inward from the inner peripheral surface 74d of the second stator core base 74 is called a second stator side base portion 75g, and a tip portion bent in the axial direction is called a second stator side base portion 75g. This is referred to as a second stator side magnetic pole portion 75h. The second stator side claw-shaped magnetic pole 75 before the second stator side magnetic pole portion 75h is bent is formed in a trapezoidal shape that tapers toward the tip when viewed from the axial direction.

  That is, the shape when the second stator side base portion 75g is viewed from the axial direction is a trapezoidal shape that becomes narrower as it goes radially inward, and the shape when the second stator side magnetic pole portion 75h is viewed from the radial direction. Has a trapezoidal shape that becomes narrower toward the tip. The circumferential end surfaces 75a and 75b of the second stator side claw-shaped magnetic pole 75 composed of the second stator side base portion 75g and the second stator side magnetic pole portion 75h are both flat surfaces and approach each other toward the tip. Become.

  Thereby, the cross-sectional area of the cross section obtained by cutting the second stator side base portion 75g in the axial direction when viewed from the radial direction becomes smaller as it goes inward in the radial direction. Moreover, the cross-sectional area of the cross section obtained by cutting the second stator-side magnetic pole portion 75h in the radial direction as viewed from the axial direction becomes smaller as it goes to the tip side.

  The second stator-side magnetic pole portion 75h bent in the axial direction has a fan-shaped cross section in the direction perpendicular to the axis, and the radially outer surface 75j and the inner surface 75k are centered when viewed from the axial direction. The arc surface is concentric with the inner peripheral surface 74d of the second stator core base 74 with the axis O as the center.

  The angle in the circumferential direction of the second stator side base portion 75g of each second stator side claw-shaped magnetic pole 75, that is, the angle formed between the base end portions of the circumferential end surfaces 75a and 75b with the central axis O of the rotating shaft (not shown). Is set smaller than the angle of the gap between the base ends of the second stator side base portions 75g of the adjacent second stator side claw-shaped magnetic poles 75.

  That is, by forming in this way, the shape of the second stator core 71 is the same as that of the first stator core 61. The front end surface 64f of the first stator side cylindrical wall 64e and the front end surface 74f of the second stator side cylindrical wall 74e are brought into contact with each other, and each second stator side claw-shaped magnetic pole 75 is seen from the axial direction. The first and second stator cores 61 and 71 are arranged and fixed so as to be positioned between the first stator side claw-shaped magnetic poles 65.

  At this time, as shown in FIG. 3, the first stator side claw-shaped magnetic pole 65 is set at a position where the tip surface 65 c of the first stator side magnetic pole portion 65 h is flush with the facing surface 74 a of the second stator core base 74. doing. Similarly, the second stator side claw-shaped magnetic pole 75 is set at a position where the front end surface 75c of the second stator side magnetic pole portion 75h is flush with the opposing surface 64a of the first stator core base 64.

  Incidentally, the opposing surfaces 64a and 74a of the first and second stator core bases 64 and 74, the inner peripheral surfaces of the first and second stator side cylindrical walls 64e and 74e, and the first and second stator side magnetic pole portions 65h and 75h. An annular space having a quadrangular section is defined by the outer surfaces 65j and 75j. And as shown in FIG. 3, the coil part 81 (annular winding 82) is arrange | positioned and fixed to the annular space of the cross-sectional square shape.

(Coil part 81)
As shown in FIG. 9, the coil portion 81 has an annular winding 82, and the annular winding 82 is wound around the annular space. Then, by passing a single-phase alternating current through the annular winding 82, the first and second stator side claw-shaped magnetic poles 65 and 75 are excited to different magnetic poles from time to time.

  In the stator 3 configured as described above, the first and second stator side claw-shaped magnetic poles 65 and 75 are excited to different magnetic poles from time to time by the annular winding 82 between the first and second stator cores 61 and 71. Thus, the stator has a so-called Landel type (claw pole type) structure with 24 poles.

Next, the operation of the brushless motor 1 configured as described above will be described.
Now, when a single-phase alternating current is passed through the annular winding 82 in the stator 3, a rotating magnetic field is generated in the stator 3 and the rotor 2 is driven to rotate.

  At this time, the first annular auxiliary magnet 41 was fixed to the first rotor core 11 on the side opposite to the second rotor core 21. In the first annular auxiliary magnet 41, the boundary between each of the 24 equally divided first magnet portions 42 is the circumferential center position of each first magnetic pole portion 15f or the circumferential center position of each second magnetic pole portion 25f. Is arranged with respect to the first rotor core 11 so as to match.

  The first annular auxiliary magnet 41 is magnetized in the circumferential direction in each first magnet portion 42, and in each first magnet portion 42, the first magnetic pole portion 15f side is set to the N pole, and the second magnetic pole portion 25f side is set. Magnetized so as to be the south pole.

  Therefore, the N poles of the first magnet portions 42 of the first annular auxiliary magnet 41 are arranged at the base end portions of the first magnetic pole portions 15 f that become the N poles in the field magnet 31. The S poles of the first magnet portions 42 of the first annular auxiliary magnet 41 are respectively arranged at the tip portions of the second magnetic pole portions 25f that become S poles.

  As a result, each first magnet portion 42 of the first annular auxiliary magnet 41 leaks magnetic flux (short-circuit magnetic flux) from the proximal end portion of the N-pole first magnetic pole portion 15f to the distal end portion of the S-pole second magnetic pole portion 25f. Is reduced.

  Similarly, the second annular auxiliary magnet 51 is fixed to the second rotor core 21 on the side opposite to the first rotor core 11. In the second annular auxiliary magnet 51, the boundary between the 24 equally divided second magnet parts 52 is the circumferential center position of each second magnetic pole part 25f or the circumferential center position of each first magnetic pole part 15f. Are arranged with respect to the second rotor core 21 so as to match.

  The second annular auxiliary magnet 51 is magnetized in the circumferential direction in each second magnet portion 52, and in each second magnet portion 52, the second magnetic pole portion 25f side is set to the S pole, and the first magnetic pole portion 15f side is set. Magnetized so as to be an N pole.

  Accordingly, the S poles of the second magnet portions 52 of the second annular auxiliary magnet 51 are arranged at the base end portions of the second magnetic pole portions 25 f that become the S poles in the field magnet 31, respectively. The N poles of the second magnet parts 52 of the second annular auxiliary magnet 51 are respectively arranged at the tip portions of the first magnetic pole parts 15f that become N poles.

  As a result, each second magnet portion 52 of the second annular auxiliary magnet 51 leaks magnetic flux (short-circuit magnetic flux) from the distal end portion of the N-pole first magnetic pole portion 15f to the proximal end portion of the S-pole second magnetic pole portion 25f. Is reduced.

  Since the first and second annular auxiliary magnets 41 and 51 for reducing the leakage magnetic flux (short-circuit magnetic flux) are fixed to the first and second rotor cores 11 and 21, respectively, the output of the brushless motor 1 is increased. be able to.

  Here, the output of the brushless motor 1 to which the first and second annular auxiliary magnets 41 and 51 of the first embodiment are fixed and the output of the brushless motor 1 without the first and second annular auxiliary magnets 41 and 51 are provided. A comparative verification was conducted. Here, the induced voltage, which is an element of the output of the brushless motor 1, was obtained by experiment, and the result shown in FIG. 10 was obtained.

  An induced voltage characteristic line Lk in FIG. 10 is an induced voltage curve of a brushless motor in which the first and second annular auxiliary magnets 41 and 51 are not provided. An induced voltage characteristic line L1 in FIG. 10 is an induced voltage curve of the brushless motor 1 provided with the first and second annular auxiliary magnets 41 and 51 of the present embodiment.

  As is clear from this, the brushless motor 1 provided with the first and second annular auxiliary magnets 41 and 51 of the present embodiment is more than the brushless motor provided with the first and second annular auxiliary magnets 41 and 51. However, it was found that the induced voltage was increased by about 10% at the maximum value.

That is, it can be seen that the first and second annular auxiliary magnets 41 and 51 contribute to the output increase of the brushless motor 1.
Next, effects of the first embodiment will be described below.

  (1) According to the above-described embodiment, each first magnet portion 42 of the first annular auxiliary magnet 41 moves from the proximal end portion of the N-pole first magnetic pole portion 15f to the distal end portion of the S-pole second magnetic pole portion 25f. Leakage magnetic flux (short-circuit magnetic flux) can be reduced, and the output of the brushless motor 1 can be increased.

  (2) According to the present embodiment, each second magnet portion 52 of the second annular auxiliary magnet 51 moves from the distal end portion of the N-pole first magnetic pole portion 15f to the proximal end portion of the S-pole second magnetic pole portion 25f. Leakage magnetic flux (short-circuit magnetic flux) can be reduced, and the output of the brushless motor 1 can be increased.

  (3) According to the present embodiment, in the first annular auxiliary magnet 41 fixed to the first rotor core 11, each first magnet portion 42 facing the second rotor-side claw-shaped magnetic pole 25 is replaced with the second magnetic pole portion 25f. Since it was made to contact | abut to the front end surface 25c, leakage magnetic flux (short circuit magnetic flux) can be reduced more.

  (4) According to the present embodiment, in the second annular auxiliary magnet 51 fixed to the second rotor core 21, each second magnet part 52 facing the first rotor-side claw-like magnetic pole 15 is replaced with the first magnetic pole part 15 f. Since it is made to contact | abut to the front end surface 15c, leakage magnetic flux (short circuit magnetic flux) can be reduced more.

  (5) According to this embodiment, since the first and second annular auxiliary magnets 41 and 51 are annular bodies, the outer circumferential portions of the first and second rotor-side claw-shaped magnetic poles 15 and 25 are formed at a time. It can be connected and fixed, and the assembly to the first and second rotor cores 11 and 21 is simplified. In addition, since the first and second annular auxiliary magnets 41 and 51 are annular bodies, there is no possibility that the first and second annular auxiliary magnets 41 and 51 jump out in the radial direction due to the centrifugal force accompanying the rotation of the rotor 2.

  (6) According to the present embodiment, in each first rotor-side claw-shaped magnetic pole 15, an edge where the horizontal first back surface 15m of the first step portion 15d intersects the outer surface 15j of the first magnetic pole portion 15f is The first connecting surface f1 was formed by cutting out into an isosceles triangular shape with a right angle in cross section. Then, the first annular auxiliary magnet 41 having an isosceles triangle shape having a right-angle cross section was fixed to the first connection surface f1. At this time, the radial outer surface 41b of the first annular auxiliary magnet 41 is flush with the outer surface 15j of the first magnetic pole portion 15f, and the axial outer surface 41c of the first annular auxiliary magnet 41 is the first stepped portion 15d. The first back surface 15m was flush.

  Similarly, in each of the second rotor-side claw-shaped magnetic poles 25, an edge where the horizontal second back surface 25m of the second stepped portion 25d intersects the outer surface 25j of the second magnetic pole portion 25f has an isosceles triangular shape with a perpendicular cross section. A second connecting surface f2 was formed by cutting out the first connecting surface. Then, the second annular auxiliary magnet 51 having an isosceles right triangle shape in cross section was fixed to the second connecting surface f2. At this time, the radially outer surface 51b of the second annular auxiliary magnet 51 is flush with the outer surface 25j of the second magnetic pole portion 25f, and the axially outer surface 51c of the second annular auxiliary magnet 51 is the second step portion 25d. The second back surface 25m was made flush.

  Thus, the provision of the first and second annular auxiliary magnets 41 and 51 does not increase the overall shape of the rotor 2 in the axial direction and the radial direction. That is, the rotor 2 can be reduced in size.

  As shown in FIG. 11, in the first embodiment, the magnetic detector 91 made of a Hall IC is mounted on a motor housing (not shown) so as to face the first annular auxiliary magnet 41 with a certain distance. It may be provided to detect rotation of the rotor 2 (motor 1) such as the rotational position and the rotational speed.

  More specifically, the magnetic detector 91 is disposed in the motor housing so that each first magnet portion 42 of the first annular auxiliary magnet 41 passes forward when the first annular auxiliary magnet 41 rotates together with the rotor 2. Yes.

  Then, as the rotor 2 rotates, the magnetic detector 91 detects the leakage magnetic flux of each first magnet portion 42 passing in front of the rotor 2 and outputs the detection signal to a control circuit (not shown). A control circuit (not shown) calculates the rotation angle (rotation position) of the rotor 2 based on the detection signal from the magnetic detector 91 and calculates the rotation speed.

  FIG. 12 shows the detection waveform B1 of the magnetic detector 91 that detects the leakage magnetic flux of the first annular auxiliary magnet 41 provided in the brushless motor 1 of the first embodiment, and the first and second annular auxiliary magnets 41 and 51. The detection waveform Bk of the magnetic detector 91 which detects the leakage magnetic flux of the brushless motor 1 which is not provided is shown. As is apparent from FIG. 12, the detection waveform B1 for detecting the leakage magnetic flux of the first annular auxiliary magnet 41 of the first embodiment has a larger change width. Therefore, it is possible to detect rotation with high accuracy and to reduce the number of parts because the first annular auxiliary magnet 41 also serves as a member to be detected for detecting the rotation angle and the number of rotations.

(Second Embodiment)
Hereinafter, a second embodiment of the motor will be described with reference to FIGS.
In this embodiment, the relative positions in the circumferential direction of the first and second annular auxiliary magnets 41 and 51 of the first embodiment with respect to the first and second rotor side claw-shaped magnetic poles 15 and 25, and the first and second The magnetization directions of the magnet portions 42 and 52 are different. Therefore, different parts will be described in detail for convenience of explanation.

  As shown in FIG. 13, the first annular auxiliary magnet 41 in which 24 first magnet portions 42 are formed in the circumferential direction has respective boundaries between the first magnet portion 42 and the first magnet portion 42. It arrange | positions with respect to the 1st rotor core 11 so that the circumferential direction intermediate position of the 1 rotor side claw-shaped magnetic pole 15 and each 2nd rotor side claw-shaped magnetic pole 25 may correspond.

  Unlike the first embodiment, each first magnet portion 42 of the first annular auxiliary magnet 41 is magnetized (magnetized) in the axial direction. More specifically, the first magnet portion 42 facing the first rotor-side claw-shaped magnetic pole 15 is magnetized and magnetized so that the first rotor core 11 side is an S pole and the second rotor core 21 side is an N pole in the axial direction. In addition, the first magnet portion 42 facing the second rotor-side claw-shaped magnetic pole 25 is magnetized so that the first rotor core 11 side is an N pole and the second rotor core 21 side is an S pole in the axial direction.

As a result, the leakage magnetic flux from the proximal end portion of the first magnetic pole portion 15f to the distal end portion of the second magnetic pole portion 25f is reduced.
On the other hand, as shown in FIG. 13, the second annular auxiliary magnet 51 having 24 second magnet portions 52 formed in the circumferential direction has respective boundaries between the second magnet portion 52 and the second magnet portion 52. It arrange | positions with respect to the 1st rotor core 11 so that the circumferential direction intermediate position of each 1st rotor side claw-shaped magnetic pole 15 and each 2nd rotor side claw-shaped magnetic pole 25 may correspond.

  Unlike the first embodiment, each second magnet portion 52 of the second annular auxiliary magnet 51 is magnetized (magnetized) in the axial direction. More specifically, the second magnet portion 52 facing the second rotor side claw-shaped magnetic pole 25 is magnetized and magnetized so that the second rotor core 21 side is N magnetized and the first rotor core 11 side is S pole in the axial direction. Further, the second magnet portion 52 facing the first rotor-side claw-shaped magnetic pole 15 is magnetized so that the second rotor core 21 side is an S pole and the first rotor core 11 side is an N pole in the axial direction.

Thereby, the leakage magnetic flux from the distal end portion of the first magnetic pole portion 15f to the proximal end portion of the second magnetic pole portion 25f is reduced.
Next, the operation of the brushless motor 1 configured as described above will be described.

  Each first magnet portion 42 of the first annular auxiliary magnet 41 was magnetized in the axial direction. The first magnet portion 42 facing the first rotor-side claw-shaped magnetic pole 15 is magnetized so that the first rotor core 11 side is the S pole and the second rotor core 21 side is the N pole in the axial direction. Further, the first magnet portion 42 facing the second rotor-side claw-shaped magnetic pole 25 is magnetized so that the first rotor core 11 side is an N pole and the second rotor core 21 side is an S pole in the axial direction.

  Accordingly, each first magnet portion 42 of the first annular auxiliary magnet 41 causes a leakage magnetic flux (short-circuit magnetic flux) from the proximal end portion of the N-pole first magnetic pole portion 15f to the distal end portion of the S-pole second magnetic pole portion 25f. Reduced.

  On the other hand, each second magnet portion 52 of the second annular auxiliary magnet 51 was magnetized in the axial direction. The second magnet portion 52 facing the second rotor side claw-shaped magnetic pole 25 is magnetized so that the second rotor core 21 side is an N magnet and the first rotor core 11 side is an S pole in the axial direction. The second magnet portion 52 facing the first rotor-side claw-shaped magnetic pole 15 is magnetized so that the second rotor core 21 side is an S pole and the first rotor core 11 side is an N pole in the axial direction.

  Therefore, the leakage magnetic flux (short-circuit magnetic flux) from the distal end portion of the N-pole first magnetic pole portion 15f to the proximal end portion of the S-pole second magnetic pole portion 25f is caused by each second magnet portion 52 of the second annular auxiliary magnet 51. Reduce.

  Since the first and second annular auxiliary magnets 41 and 51 for reducing the leakage magnetic flux (short-circuit magnetic flux) are fixed to the first and second rotor cores 11 and 21, respectively, the output of the brushless motor 1 is increased. be able to.

  Here, the output of the brushless motor 1 to which the first and second annular auxiliary magnets 41 and 51 of the second embodiment are fixed and the output of the brushless motor 1 without the first and second annular auxiliary magnets 41 and 51 are provided. A comparative verification was conducted. Here, as in the first embodiment, the induced voltage, which is an element of the output of the brushless motor 1, was obtained by experiment, and the result shown in FIG. 14 was obtained.

  The induced voltage characteristic line Lk in FIG. 14 is an induced voltage curve of a brushless motor in which the first and second annular auxiliary magnets 41 and 51 are not provided. The induced voltage characteristic line L2 of FIG. 14 is an induced voltage curve of the brushless motor 1 provided with the first and second annular auxiliary magnets 41 and 51 of the second embodiment.

  As is clear from this, the brushless motor 1 provided with the first and second annular auxiliary magnets 41 and 51 of the present embodiment is more than the brushless motor provided with the first and second annular auxiliary magnets 41 and 51. However, it was found that the induced voltage was increased by about 7% at the maximum value.

That is, it can be seen that the first and second annular auxiliary magnets 41 and 51 of the present embodiment contribute to the output increase of the brushless motor 1.
The second embodiment has the following effects in addition to the effects (5) and (6) described in the effects of the first embodiment.

  (1) According to the present embodiment, each first magnet portion 42 of the first annular auxiliary magnet 41 moves from the proximal end portion of the N-pole first magnetic pole portion 15f to the distal end portion of the S-pole second magnetic pole portion 25f. Leakage magnetic flux (short-circuit magnetic flux) can be reduced, and the output of the brushless motor 1 can be increased.

  (2) According to the present embodiment, each second magnet portion 52 of the second annular auxiliary magnet 51 moves from the distal end portion of the N-pole first magnetic pole portion 15f to the proximal end portion of the S-pole second magnetic pole portion 25f. Leakage magnetic flux (short-circuit magnetic flux) can be reduced, and the output of the brushless motor 1 can be increased.

  (3) According to the present embodiment, in the first annular auxiliary magnet 41 fixed to the first rotor core 11, each first magnet portion 42 facing the second rotor-side claw-shaped magnetic pole 25 is replaced with the second magnetic pole portion 25f. Since it was made to contact | abut to the front end surface 25c, leakage magnetic flux (short circuit magnetic flux) can be reduced more.

  (4) According to the present embodiment, in the second annular auxiliary magnet 51 fixed to the second rotor core 21, each second magnet part 52 facing the first rotor-side claw-like magnetic pole 15 is replaced with the first magnetic pole part 15 f. Since it is made to contact | abut to the front end surface 15c, leakage magnetic flux (short circuit magnetic flux) can be reduced more.

  As shown in FIG. 15, in the second embodiment, the magnetic detector 91 made of the Hall IC is mounted on a motor housing (not shown) so as to face the first annular auxiliary magnet 41 at a predetermined interval. It may be provided to detect rotation of the rotor 2 (motor 1) such as the rotational position and the rotational speed.

  More specifically, the magnetic detector 91 is disposed in the motor housing so that each first magnet portion 42 of the first annular auxiliary magnet 41 passes forward when the first annular auxiliary magnet 41 rotates together with the rotor 2. Yes.

  Then, as the rotor 2 rotates, the magnetic detector 91 detects the leakage magnetic flux of each first magnet unit 42 when each first magnet unit 42 passes in front of the rotor 2 and controls the detection signal (not shown). Output to the circuit. A control circuit (not shown) calculates the rotation angle (rotation position) of the rotor 2 based on the detection signal from the magnetic detector 91 and calculates the rotation speed.

  FIG. 16 shows the detection waveform B2 of the magnetic detector 91 that detects the leakage magnetic flux of the first annular auxiliary magnet 41 provided in the brushless motor 1 of the second embodiment, and the first and second annular auxiliary magnets 41 and 51. The detection waveform Bk of the magnetic detector 91 which detects the leakage magnetic flux of the brushless motor 1 which is not provided is shown. As apparent from FIG. 16, the detection waveform B2 for detecting the leakage magnetic flux of the first annular auxiliary magnet 41 of the second embodiment has a more rectangular waveform. Therefore, it is possible to detect rotation with higher accuracy and to reduce the number of parts because the first annular auxiliary magnet 41 also serves as a member to be detected for detecting the rotation angle and the number of rotations.

(Third embodiment)
Hereinafter, a third embodiment of the motor will be described with reference to FIGS. 17 and 18.
In the present embodiment, the magnetization directions of the first and second magnet auxiliary portions 41 and 51 of the first and second annular auxiliary magnets 41 and 51 described in the first embodiment are different. Therefore, different parts will be described in detail for convenience of explanation.

  As in the first embodiment, the first annular auxiliary magnet 41 has 24 first magnet portions 42 formed in the circumferential direction. In the first annular auxiliary magnet 41, as in the first embodiment, each boundary between the first magnet portion 42 and the first magnet portion 42 has a first magnetic pole portion 15f of the first rotor-side claw-shaped magnetic pole 15 respectively. It arrange | positions with respect to the 1st rotor core 11 so that it may correspond with the circumferential direction center position or the circumferential direction center position of the 2nd magnetic pole part 25f of each 2nd rotor side nail | claw-shaped magnetic pole 25. FIG.

  As shown in FIG. 17, each first magnet portion 42 is magnetized in the circumferential direction. More specifically, unlike the first embodiment, each first magnet portion 42 is magnetized (magnetized) so that the first magnetic pole portion 15f side is an S pole and the second magnetic pole portion 25f side is an N pole in the circumferential direction. )

  That is, the S poles of the first magnet portions 42 are arranged at the base end portions of the first magnetic pole portions 15 f of the first rotor-side claw-shaped magnetic poles 15, respectively. Further, the N poles of the first magnet portions 42 are arranged at the tip portions of the second magnetic pole portions 25f of the second rotor side claw-shaped magnetic poles 25, respectively.

As a result, contrary to the first embodiment, the leakage magnetic flux (short-circuit magnetic flux) from the proximal end portion of the N-pole first magnetic pole portion 15f to the distal end portion of the S-pole second magnetic pole portion 25f is increased.
On the other hand, as shown in FIG. 17, each 2nd magnet part 52 is magnetized in the circumferential direction. More specifically, unlike the first embodiment, each second magnet portion 52 is magnetized (magnetized) so that the first magnetic pole portion 15f side is an S pole and the second magnetic pole portion 25f side is an N pole in the circumferential direction. )

  That is, the N poles of the second magnet parts 52 are arranged at the base end portions of the second magnetic pole parts 25f of the second rotor-side claw-shaped magnetic poles 25, respectively. Further, the S poles of the second magnet parts 52 are respectively arranged at the tip portions of the first magnetic pole parts 15 f of the first rotor-side claw-like magnetic poles 15.

Thus, contrary to the first embodiment, the leakage magnetic flux (short-circuit magnetic flux) from the distal end portion of the N-pole first magnetic pole portion 15f to the proximal end portion of the S-pole second magnetic pole portion 25f is increased.
Next, the operation of the brushless motor 1 configured as described above will be described.

  In the first annular auxiliary magnet 41, each first magnet portion 42 is magnetized so that the first magnetic pole portion 15f side is an S pole and the second magnetic pole portion 25f side is an N pole. As a result, the S poles of the first magnet portions 42 are arranged at the base end portions of the first magnetic pole portions 15 f that become the N poles in the field magnets 31, and the S poles of the field magnets 31 become the S poles. The N poles of the first magnet portions 42 are respectively arranged at the tip portions of the second magnetic pole portions 25f.

  As a result, each first magnet portion 42 of the first annular auxiliary magnet 41 leaks magnetic flux (short-circuit magnetic flux) from the proximal end portion of the N-pole first magnetic pole portion 15f to the distal end portion of the S-pole second magnetic pole portion 25f. Will increase.

  On the other hand, in the second annular auxiliary magnet 51, each second magnet portion 52 is magnetized so that the second magnetic pole portion 25f side is an N pole and the first magnetic pole portion 15f side is an S pole. As a result, the N poles of the second magnet portions 52 are respectively arranged at the base end portions of the second magnetic pole portions 25 f that become the S poles in the field magnet 31. The S poles of the second magnet parts 52 are arranged at the tip of the first magnetic pole part 15f.

  As a result, each second magnet portion 52 of the second annular auxiliary magnet 51 leaks magnetic flux (short-circuit magnetic flux) from the distal end portion of the N-pole first magnetic pole portion 15f to the proximal end portion of the S-pole second magnetic pole portion 25f. Will increase.

  As described above, the first and second annular auxiliary magnets 41 and 51 for increasing the leakage magnetic flux (short-circuit magnetic flux) are fixed to the first and second rotor cores 11 and 21, respectively, so that the rotational speed of the brushless motor 1 is increased. be able to.

  That is, the brushless motor 1 according to the third embodiment actively increases the leakage magnetic flux (short-circuit magnetic flux), so that the so-called weakening field is generated in the first and second claw-shaped magnetic poles 15 and 25 of the rotor 2. By generating a magnetic effect, the rotational speed can be increased as compared with the brushless motor 1 of the first embodiment.

  Here, the output of the brushless motor 1 to which the first and second annular auxiliary magnets 41 and 51 of the third embodiment are fixed and the brushless motor to which the first and second annular auxiliary magnets 41 and 51 of the first embodiment are fixed. Comparison verification with the output of 1 was performed. Here, the induced voltage, which is an element of the output of the brushless motor 1, was obtained by experiment, and the result shown in FIG. 18 was obtained.

  An induced voltage characteristic line L1 in FIG. 18 is an induced voltage curve of the brushless motor provided with the first and second annular auxiliary magnets 41 and 51 of the first embodiment. An induced voltage characteristic line L3 in FIG. 18 is an induced voltage curve of the brushless motor 1 provided with the first and second annular auxiliary magnets 41 and 51 of the third embodiment.

  As is clear from this, the brushless motor 1 provided with the first and second annular auxiliary magnets 41 and 51 of the present embodiment is provided with the first and second annular auxiliary magnets 41 and 51 of the first embodiment. Compared with the brushless motor 1, it can be seen that the induced voltage can be reduced by about 21% at the maximum value by the field weakening effect.

The third embodiment has the following effects in addition to the effects (5) and (6) described in the effects of the first embodiment.
(1) According to the present embodiment, each first magnet portion 42 of the first annular auxiliary magnet 41 moves from the proximal end portion of the N-pole first magnetic pole portion 15f to the distal end portion of the S-pole second magnetic pole portion 25f. Leakage flux (short-circuit magnetic flux) can be increased, and the brushless motor 1 can be driven at a high rotational speed.

  (2) According to the present embodiment, each second magnet portion 52 of the second annular auxiliary magnet 51 moves from the distal end portion of the N-pole first magnetic pole portion 15f to the proximal end portion of the S-pole second magnetic pole portion 25f. Leakage flux (short-circuit magnetic flux) can be increased, and the brushless motor 1 can be driven at a high rotational speed.

  (3) According to the present embodiment, in the first annular auxiliary magnet 41 fixed to the first rotor core 11, each first magnet portion 42 facing the second rotor-side claw-shaped magnetic pole 25 is replaced with the second magnetic pole portion 25f. Since it is made to contact | abut to the front end surface 25c, leakage magnetic flux (short-circuit magnetic flux) can be increased more.

  (4) According to the present embodiment, in the second annular auxiliary magnet 51 fixed to the second rotor core 21, each second magnet part 52 facing the first rotor-side claw-like magnetic pole 15 is replaced with the first magnetic pole part 15 f. Since it is made to contact | abut to the front end surface 15c, leakage magnetic flux (short-circuit magnetic flux) can be increased more.

(Fourth embodiment)
Hereinafter, a fourth embodiment of the motor will be described with reference to FIGS.
In the present embodiment, the magnetization directions of the first and second magnet parts 42 and 52 of the first and second annular auxiliary magnets 41 and 51 described in the second embodiment are different. Therefore, different parts will be described in detail for convenience of explanation.

  As shown in FIG. 19, the 1st annular auxiliary magnet 41 magnetized each 1st magnet part 42 to the axial direction similarly to 2nd Embodiment. Unlike the second embodiment, the first magnet portion 42 facing the first rotor side claw-shaped magnetic pole 15 has an N pole on the first rotor core 11 side and an S pole on the second rotor core 21 side in the axial direction. Was magnetized. In addition, the first magnet portion 42 facing the second rotor-side claw-shaped magnetic pole 25 was magnetized so that the first rotor core 11 side was an S pole and the second rotor core 21 side was an N pole in the axial direction.

  Accordingly, each first magnet portion 42 of the first annular auxiliary magnet 41 causes a leakage magnetic flux (short-circuit magnetic flux) from the proximal end portion of the N-pole first magnetic pole portion 15f to the distal end portion of the S-pole second magnetic pole portion 25f. To increase.

  On the other hand, as shown in FIG. 19, the 2nd annular auxiliary magnet 51 magnetized each 2nd magnet part 52 to the axial direction similarly to 2nd Embodiment. Unlike the second embodiment, the second magnet portion 52 facing the second rotor-side claw-shaped magnetic pole 25 has an S-magnetism on the second rotor core 21 side and an N-pole on the first rotor core 11 side in the axial direction. Was magnetized. In addition, the second magnet portion 52 facing the first rotor-side claw-shaped magnetic pole 15 was magnetized so that the second rotor core 21 side was an N pole and the first rotor core 11 side was an S pole in the axial direction.

  Therefore, the leakage magnetic flux (short-circuit magnetic flux) from the distal end portion of the N-pole first magnetic pole portion 15f to the proximal end portion of the S-pole second magnetic pole portion 25f is caused by each second magnet portion 52 of the second annular auxiliary magnet 51. To increase.

Next, the operation of the brushless motor 1 configured as described above will be described.
In the first annular auxiliary magnet 41, the first magnet portion 42 facing the first rotor-side claw-shaped magnetic pole 15 is magnetized so that the first rotor core 11 side is N-pole and the second rotor core 21 side is S-pole in the axial direction. ing. The first magnet portion 42 facing the second rotor-side claw-shaped magnetic pole 25 is magnetized so that the first rotor core 11 side is the S pole and the second rotor core 21 side is the N pole in the axial direction.

  Accordingly, each first magnet portion 42 of the first annular auxiliary magnet 41 causes a leakage magnetic flux (short-circuit magnetic flux) from the proximal end portion of the N-pole first magnetic pole portion 15f to the distal end portion of the S-pole second magnetic pole portion 25f. To increase.

  On the other hand, in the second annular auxiliary magnet 51, the second magnet portion 52 facing the second rotor-side claw-shaped magnetic pole 25 has an S pole on the second rotor core 21 side and an N pole on the first rotor core 11 side in the axial direction. Magnetized. The second magnet portion 52 facing the first rotor-side claw-shaped magnetic pole 15 is magnetized so that the second rotor core 21 side is an N pole and the first rotor core 11 side is an S pole in the axial direction.

  Therefore, the leakage magnetic flux (short-circuit magnetic flux) from the distal end portion of the N-pole first magnetic pole portion 15f to the proximal end portion of the S-pole second magnetic pole portion 25f is caused by each second magnet portion 52 of the second annular auxiliary magnet 51. ,To increase.

  As described above, since the first and second annular auxiliary magnets 41 and 51 that positively increase the leakage magnetic flux (short-circuit magnetic flux) are fixed to the first and second rotor cores 11 and 21, respectively, the rotation of the brushless motor 1 is performed. You can increase the number.

  That is, the brushless motor 1 according to the fourth embodiment actively increases the leakage magnetic flux (short-circuit magnetic flux), so that the so-called weakening field is generated in the first and second claw-shaped magnetic poles 15 and 25 of the rotor 2. By generating a magnetic effect, the rotational speed can be increased more than that of the brushless motor 1 of the second embodiment.

  Here, the output of the brushless motor 1 to which the first and second annular auxiliary magnets 41 and 51 of the fourth embodiment are fixed and the brushless motor to which the first and second annular auxiliary magnets 41 and 51 of the second embodiment are fixed. Comparison verification with the output of 1 was performed. Here, an induced voltage, which is an element of the output of the brushless motor 1, was obtained by experiment, and the result shown in FIG. 20 was obtained.

  An induced voltage characteristic line L2 in FIG. 20 is an induced voltage curve of the brushless motor provided with the first and second annular auxiliary magnets 41 and 51 of the second embodiment. An induced voltage characteristic line L4 in FIG. 20 is an induced voltage curve of the brushless motor 1 provided with the first and second annular auxiliary magnets 41 and 51 of the fourth embodiment.

  As is clear from this, the brushless motor 1 provided with the first and second annular auxiliary magnets 41 and 51 of the present embodiment is provided with the first and second annular auxiliary magnets 41 and 51 of the second embodiment. Compared with the brushless motor 1, it can be seen that the induced voltage can be reduced by about 13% at the maximum value by the field weakening effect.

The fourth embodiment has the following effects in addition to the effects (5) and (6) described in the effects of the first embodiment.
(1) According to the present embodiment, each first magnet portion 42 of the first annular auxiliary magnet 41 moves from the proximal end portion of the N-pole first magnetic pole portion 15f to the distal end portion of the S-pole second magnetic pole portion 25f. Leakage flux (short-circuit magnetic flux) can be increased, and the brushless motor 1 can be driven at a high rotational speed.

  (2) According to the present embodiment, each second magnet portion 52 of the second annular auxiliary magnet 51 moves from the distal end portion of the N-pole first magnetic pole portion 15f to the proximal end portion of the S-pole second magnetic pole portion 25f. Leakage flux (short-circuit magnetic flux) can be increased, and the brushless motor 1 can be driven at a high rotational speed.

  (3) According to the present embodiment, in the first annular auxiliary magnet 41 fixed to the first rotor core 11, each first magnet portion 42 facing the second rotor-side claw-shaped magnetic pole 25 is replaced with the second magnetic pole portion 25f. Since it is made to contact | abut to the front end surface 25c, leakage magnetic flux (short-circuit magnetic flux) can be increased more.

  (4) According to the present embodiment, in the second annular auxiliary magnet 51 fixed to the second rotor core 21, each second magnet part 52 facing the first rotor-side claw-like magnetic pole 15 is replaced with the first magnetic pole part 15 f. Since it is made to contact | abut to the front end surface 15c, leakage magnetic flux (short-circuit magnetic flux) can be increased more.

  As shown in FIG. 21, in the fourth embodiment, a magnetic detector 91 made of a Hall IC is mounted on a motor housing (not shown) so as to face the first annular auxiliary magnet 41 at a predetermined interval. It may be provided to detect rotation of the rotor 2 (motor 1) such as the rotational position and the rotational speed.

  More specifically, the magnetic detector 91 is disposed in the motor housing so that each first magnet portion 42 of the first annular auxiliary magnet 41 passes forward when the first annular auxiliary magnet 41 rotates together with the rotor 2. Yes.

  Then, as the rotor 2 rotates, the magnetic detector 91 detects the leakage magnetic flux of each first magnet unit 42 when each first magnet unit 42 passes in front of the rotor 2 and controls the detection signal (not shown). Output to the circuit. A control circuit (not shown) calculates the rotation angle (rotation position) of the rotor 2 based on the detection signal from the magnetic detector 91 and calculates the rotation speed.

  FIG. 22 shows the detection waveform B4 of the magnetic detector 91 that detects the leakage magnetic flux of the first annular auxiliary magnet 41 provided in the brushless motor 1 of the fourth embodiment, and the first annular auxiliary magnet 41 of the second embodiment. The detection waveform B2 of the magnetic detector 91 which detects a leakage magnetic flux is shown. As is apparent from FIG. 22, the detection waveform B4 for detecting the leakage magnetic flux of the first annular auxiliary magnet 41 of the fourth embodiment is a rectangular waveform having a larger change width. Therefore, it is possible to detect rotation with higher accuracy and to reduce the number of parts because the first annular auxiliary magnet 41 also serves as a member to be detected for detecting the rotation angle and the number of rotations.

Each of the above embodiments may be modified as follows.
The first and second annular auxiliary magnets 41 and 51 of each of the above embodiments have a right-angled isosceles triangle, but may be a right-angled triangle, a quadrangle, or the like.

  In the above embodiment, the brushless motor 1 includes the rotor 2 disposed inside the Landel-type stator 3 in which the first stator side claw-shaped magnetic pole 65 and the second stator side claw-shaped magnetic pole 75 are alternately arranged in the circumferential direction. It was.

You may apply this to the motor which has arrange | positioned the rotor 2 of each embodiment inside with respect to the stator which is not a Landel type.
The three-phase brushless motor 1 of the above embodiment may be applied to the three-phase brushless motor M by stacking three in the axial direction. That is, as shown in FIG. 23, the three-phase brushless motor M has three brushless motors 1, that is, a U-phase motor unit Mu, a V-phase motor unit Mv, and a W-phase motor unit Mw stacked in order from the top. It is.

  As shown in FIG. 24, the three-phase rotor 2M of the three-phase brushless motor M includes three single-phase rotors 2, that is, the U-phase rotor 2u, the V-phase rotor 2v, and the W-phase rotor 2w in order from the top. Laminate to.

  On the other hand, as shown in FIG. 25, the three-phase stator 3M of the three-phase brushless motor M includes three single-phase stators 3, that is, a U-phase stator 3u, a V-phase stator 3v, and a W-phase stator 3w in order from the top. Laminate to. A U-phase current out of the three-phase current flows through the U-phase stator 3u, a V-phase current out of the three-phase current flows through the V-phase stator 3v, and a W-phase current out of the three-phase current flows through the W-phase stator 3w. Shed.

In the three-phase rotor 2M, the U-phase rotor 2u, the V-phase rotor 2v, and the W-phase rotor 2w may be stacked with a mechanical angle shifted by 5 degrees (electrical angle 60 degrees).
More specifically, as shown in FIG. 24, the V-phase rotor 2v has a mechanical angle of 5 with respect to the U-phase rotor 2u in the counterclockwise direction around the central axis O of the rotation axis as viewed from the U-phase rotor 2u. It is fixed to the rotating shaft with a shift of 60 degrees (60 degrees in electrical angle). The W-phase rotor 2w is shifted from the V-phase rotor 2v 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 2v. Stick to the rotating shaft.

Similarly, in the three-phase stator 3M, the U-phase stator 3u, the V-phase stator 3v, and the W-phase stator 3w may be stacked with a mechanical angle shifted by 5 degrees (an electrical angle of 60 degrees).
More specifically, as shown in FIG. 25, the V-phase stator 3v is 5 degrees mechanical angle (electrical angle) with respect to the U-phase stator 3u in the clockwise direction around the central axis O when viewed from the U-phase stator 3u. At 60 degrees) and is fixed to the motor housing. The W-phase stator 3w is fixed to the motor housing with a mechanical angle of 5 degrees (electrical angle 60 degrees) shifted clockwise from the V-phase stator 3v with respect to the V-phase stator 3v.

  Similarly, in a three-phase motor, a three-phase motor 2M configured by applying the rotor 2 of each embodiment to a three-phase stator that is not a Landel type is arranged on the inner side. You may apply.

  In each of the above embodiments, the number of first and second rotor side claw-shaped magnetic poles 15 and 25 of the first and second rotor cores 11 and 21 is twelve, but the number may be changed as appropriate. Good. Similarly, although the number of the first and second stator side claw-shaped magnetic poles 65 and 75 of the first and second stator cores 61 and 71 is 12, the number may be changed as appropriate. Of course.

  In each of the above embodiments, the field magnet 31 and the first and second annular auxiliary magnets 41 and 51 are formed of ferrite magnets, but may be implemented by other permanent magnets such as neodymium magnets. Of course, these various permanent magnets may be appropriately combined.

  In each of the above embodiments, the first annular auxiliary magnet 41 is brought into contact with the distal end surface 25c of the second magnetic pole portion 25f, and the second annular auxiliary magnet 51 is brought into contact with the distal end surface 15c of the first magnetic pole portion 15f. Although implemented, this may be carried out in close proximity to each other.

  In each of the above embodiments, the magnetic detector 91 detects the first magnet portion 42 of the first annular auxiliary magnet 41 when the rotation of the motor 1 is detected, but the magnetic detector 91 is used as the second annular auxiliary magnet 51. You may implement so that the 2nd magnet part 52 of this may be detected.

  In the third embodiment, the rotation detection of the motor 1 by the magnetic detector 91 has not been described, but it is needless to say that the rotation of the motor 1 can be detected by performing the same as in the first embodiment.

  DESCRIPTION OF SYMBOLS 1 ... Brushless motor (motor), 2 ... Rotor, 3 ... Stator, 11 ... 1st rotor core, 11a ... Through-hole, 14 ... 1st rotor core base, 14a ... Opposing surface, 14b ... Anti-opposing surface, 14c ... Outer peripheral surface, DESCRIPTION OF SYMBOLS 15 ... 1st rotor side claw-shaped magnetic pole (1st claw-shaped magnetic pole), 15a, 15b ... End surface, 15c ... Front end surface, 15d ... 1st level | step difference part, 15e ... 1st level | step difference surface, 15f ... 1st magnetic pole part, 15j ... outer surface, 15k ... inner surface, 15m ... first back surface, 21 ... second rotor core, 21a ... through hole, 24 ... second rotor core base, 24a ... facing surface, 24b ... anti-facing surface, 24c ... outer peripheral surface, 25 ... 2nd rotor side claw-shaped magnetic pole (2nd claw-shaped magnetic pole), 25a, 25b ... End face, 25c ... End face, 25d ... 2nd level | step difference part, 25e ... 2nd level | step difference surface, 25f ... 2nd magnetic pole part, 25j ... Outer side, 25k ... inner side, 25m ... No. Back surface, 31 ... Field magnet, 32 ... Through hole, 33, 34 ... Side surface, 35 ... Outer peripheral surface, 41, 51 ... First and second annular auxiliary magnets, 41a, 51a ... Inner side surface, 41b, 51b ... Radial direction Outer side surface, 41c, 51c ... radially outer side surface, 42, 52 ... first and second magnet parts, 61 ... first stator core, 64 ... first stator core base, 64a ... opposing surface, 64d ... inner peripheral surface, 64e ... First stator side cylindrical wall, 64f ... tip surface, 65 ... first stator side claw-shaped magnetic pole (first claw-shaped magnetic pole), 65a, 65b ... end surface, 65c ... tip surface, 65g ... first stator side base, 65h ... 1st stator side magnetic pole part, 65j ... outer side surface, 65k ... inner side surface, 71 ... 2nd stator core, 74 ... 2nd stator core base, 74a ... opposing surface, 74d ... inner peripheral surface, 74e ... 2nd stator side cylindrical wall, 74f ... tip surface, 75 Second stator side claw-shaped magnetic pole (second claw-shaped magnetic pole), 75a, 75b ... end face, 75c ... tip face, 75g ... second stator side base, 75h ... second stator side magnetic pole part, 75j ... outer face, 75k ... Inner side surface, 81 ... coil portion, 82 ... annular winding, 91 ... magnetic detector, O ... central axis, f1 ... first connection surface, f2 ... second connection surface, Lk, L1-L4 ... induced voltage characteristic line, Bk, B1, B2, B4 ... detection waveform, M ... three-phase brushless motor, 2M ... three-phase rotor, 3M ... three-phase stator, Mu ... U-phase motor, Mv ... V-phase motor, Mw ... W-phase motor, 2u ... U-phase rotor, 2v ... V-phase rotor, 2w ... W-phase rotor, 3u ... U-phase stator, 3v ... V-phase stator, 3w ... W-phase stator.

Claims (14)

A field magnet magnetized in the axial direction;
A first rotor core base is disposed on one side of the field magnet in the axial direction, and a plurality of first claw-shaped magnetic poles are bent and extended on the outer periphery of the first rotor core base at equal intervals to the axial field magnet side. A first rotor core formed;
A second rotor core base is disposed on the other axial side of the field magnet, and a plurality of second claw-shaped magnetic poles are bent and extended toward the axial field magnet side at equal intervals on the outer periphery of the second rotor core base. The second claw-shaped magnetic poles are arranged between the first claw-shaped magnetic poles of the corresponding first rotor core, and the first claw-shaped magnetic poles are formed by the field magnets. A rotor that functions as one magnetic pole and functions as a second magnetic pole as a second claw-shaped magnetic pole,
Each of the first claw-shaped magnetic poles of the first rotor core is an annular first annular auxiliary magnet having a plurality of first magnet portions that control leakage flux with respect to the second claw-shaped magnetic pole adjacent in the circumferential direction. Concatenate,
Each of the second claw-shaped magnetic poles of the second rotor core is an annular second annular auxiliary magnet having a plurality of second magnet portions that control leakage flux with respect to the first claw-shaped magnetic pole adjacent in the circumferential direction. Concatenate ,
The first annular auxiliary magnet is fixed to the outside of the bent portion of each of the first claw-shaped magnetic poles, and the second claw-shaped magnetic poles of the second rotor core are relatively disposed between the adjacent first claw-shaped magnetic poles. It is in contact with the tip,
The second annular auxiliary magnet is fixed to the outside of the bent portion of each of the second claw-shaped magnetic poles, and the first claw-shaped magnetic poles of the first rotor core disposed relatively between the adjacent second claw-shaped magnetic poles. A rotor that is in contact with a tip portion . The rotor according to claim 1, wherein
It said first annular auxiliary magnet is also of a and the Ru is adhered and fixed to the cut out surface of the outer corners of the bent portions of the first claw-shaped magnetic poles,
It said second annular auxiliary magnet rotor, wherein the one in which is adhesively fixed to the notched surface of the outer corner portion of the bent portion of each of the second claw-shaped magnetic poles. The rotor according to claim 1 or 2,
The first annular auxiliary magnet is formed with a first magnet portion that controls a leakage magnetic flux that is equally divided by the number of the first claw-shaped magnetic poles and the second claw-shaped magnetic poles in the circumferential direction.
The second annular auxiliary magnet is formed with a second magnet portion for controlling a leakage magnetic flux that is equally divided by the number of the first claw-shaped magnetic poles and the second claw-shaped magnetic poles in the circumferential direction. Rotor. The rotor according to claim 3, wherein
Each first magnet portion of the first annular auxiliary magnet is magnetized in the circumferential direction,
Each of the second magnet portions of the second annular auxiliary magnet is magnetized in the circumferential direction. The rotor according to claim 4, wherein
In the first annular auxiliary magnet, the boundary that divides each first magnet portion coincides with the circumferential center position of each first claw-shaped magnetic pole or the circumferential center position of each second claw-shaped magnetic pole. And fixed to the first rotor core,
In the second annular auxiliary magnet, the boundary that divides each second magnet portion coincides with the circumferential center position of each first claw-shaped magnetic pole or the circumferential center position of each second claw-shaped magnetic pole. Further, the rotor is fixed to the second rotor core. The rotor according to claim 5, wherein
Each first magnet portion of the first annular auxiliary magnet coincides with the circumferential center position of the second claw-shaped magnetic pole, with the boundary side coinciding with the circumferential center position of the first claw-shaped magnetic pole as the first magnetic pole. The boundary side is magnetized to become the second magnetic pole,
Each second magnet portion of the second annular auxiliary magnet coincides with the circumferential center position of the second claw-shaped magnetic pole with the boundary side coincident with the circumferential center position of the first claw-shaped magnetic pole as the first magnetic pole. The rotor is magnetized so that the boundary side becomes the second magnetic pole. A field magnet magnetized in the axial direction;
A first rotor core base is disposed on one side of the field magnet in the axial direction, and a plurality of first claw-shaped magnetic poles are bent and extended on the outer periphery of the first rotor core base at equal intervals to the axial field magnet side. A first rotor core formed;
A second rotor core base is disposed on the other axial side of the field magnet, and a plurality of second claw-shaped magnetic poles are bent and extended toward the axial field magnet side at equal intervals on the outer periphery of the second rotor core base. A second rotor core formed and disposed between the first claw-shaped magnetic poles of the corresponding first rotor core.
A rotor in which the first claw-shaped magnetic pole functions as a first magnetic pole and the second claw-shaped magnetic pole functions as a second magnetic pole in the field magnet,
Each of the first claw-shaped magnetic poles of the first rotor core is an annular first annular auxiliary magnet having a plurality of first magnet portions that control leakage flux with respect to the second claw-shaped magnetic pole adjacent in the circumferential direction. Concatenate,
Each of the second claw-shaped magnetic poles of the second rotor core is an annular second annular auxiliary magnet having a plurality of second magnet portions that control leakage flux with respect to the first claw-shaped magnetic pole adjacent in the circumferential direction. Concatenate,
The first annular auxiliary magnet is formed with a first magnet portion that controls a leakage magnetic flux that is equally divided by the number of the first claw-shaped magnetic poles and the second claw-shaped magnetic poles in the circumferential direction.
The second annular auxiliary magnet is formed with a second magnet part for controlling a leakage magnetic flux that is equally divided by the number of the first claw-shaped magnetic pole and the second claw-shaped magnetic pole in the circumferential direction,
Each first magnet portion of the first annular auxiliary magnet is magnetized in the circumferential direction,
Each second magnet portion of the second annular auxiliary magnet is magnetized in the circumferential direction,
In the first annular auxiliary magnet, the boundary that divides each first magnet portion coincides with the circumferential center position of each first claw-shaped magnetic pole or the circumferential center position of each second claw-shaped magnetic pole. And fixed to the first rotor core,
In the second annular auxiliary magnet, the boundary that divides each second magnet portion coincides with the circumferential center position of each first claw-shaped magnetic pole or the circumferential center position of each second claw-shaped magnetic pole. And fixed to the second rotor core,
Each first magnet portion of the first annular auxiliary magnet coincides with the circumferential center position of the first claw-shaped magnetic pole with the boundary side coincident with the circumferential center position of the second claw-shaped magnetic pole as the first magnetic pole. Magnetized so that the boundary side becomes the second magnetic pole,
Each second magnet portion of the second annular auxiliary magnet coincides with the circumferential center position of the first claw-shaped magnetic pole with the boundary side coincident with the circumferential center position of the second claw-shaped magnetic pole as the first magnetic pole. The rotor is magnetized so that the boundary side becomes the second magnetic pole. A field magnet magnetized in the axial direction;
A first rotor core base is disposed on one side of the field magnet in the axial direction, and a plurality of first claw-shaped magnetic poles are bent and extended on the outer periphery of the first rotor core base at equal intervals to the axial field magnet side. A first rotor core formed;
A second rotor core base is disposed on the other axial side of the field magnet, and a plurality of second claw-shaped magnetic poles are bent and extended toward the axial field magnet side at equal intervals on the outer periphery of the second rotor core base. A second rotor core formed and disposed between the first claw-shaped magnetic poles of the corresponding first rotor core.
A rotor in which the first claw-shaped magnetic pole functions as a first magnetic pole and the second claw-shaped magnetic pole functions as a second magnetic pole in the field magnet,
Each of the first claw-shaped magnetic poles of the first rotor core is an annular first annular auxiliary magnet having a plurality of first magnet portions that control leakage flux with respect to the second claw-shaped magnetic pole adjacent in the circumferential direction. Concatenate,
Each of the second claw-shaped magnetic poles of the second rotor core is an annular second annular auxiliary magnet having a plurality of second magnet portions that control leakage flux with respect to the first claw-shaped magnetic pole adjacent in the circumferential direction. Concatenate,
The first annular auxiliary magnet is formed with a first magnet portion that controls a leakage magnetic flux that is equally divided by the number of the first claw-shaped magnetic poles and the second claw-shaped magnetic poles in the circumferential direction.
The second annular auxiliary magnet is formed with a second magnet part for controlling a leakage magnetic flux that is equally divided by the number of the first claw-shaped magnetic pole and the second claw-shaped magnetic pole in the circumferential direction,
Each first magnet portion of the first annular auxiliary magnet is magnetized in the axial direction,
Each of the second magnet portions of the second annular auxiliary magnet is magnetized in the axial direction. The rotor according to claim 8, wherein
The first annular auxiliary magnet includes the first annular auxiliary magnet such that a boundary dividing each first magnet portion coincides with a circumferential intermediate position between each first claw-shaped magnetic pole and each second claw-shaped magnetic pole. Fixed to the rotor core,
The second annular auxiliary magnet includes the second annular auxiliary magnet such that a boundary dividing each second magnet portion coincides with a circumferential intermediate position between each first claw-shaped magnetic pole and each second claw-shaped magnetic pole. A rotor characterized by being fixed to a rotor core. The rotor according to claim 9, wherein
Each first magnet portion of the first annular auxiliary magnet, the first magnet portion facing the first claw-shaped magnetic pole, has the second rotor core side in the axial direction as the first magnetic pole, and the first rotor core side as the first magnet portion. The first magnet portion that is magnetized to become the second magnetic pole and faces the second claw-shaped magnetic pole is magnetized in the axial direction with the second rotor core side as the second magnetic pole and the first rotor core side as the first magnetic pole. ,
Each of the second magnet portions of the second annular auxiliary magnet, the second magnet portion facing the second claw-shaped magnetic pole, has the second rotor core side as the first magnetic pole and the first rotor core side as the axial direction. The second magnet portion that is magnetized to become the second magnetic pole and faces the first claw-shaped magnetic pole is magnetized in the axial direction with the second rotor core side as the second magnetic pole and the first rotor core side as the first magnetic pole. Rotor characterized by being. The rotor according to claim 9, wherein
Each first magnet portion of the first annular auxiliary magnet, the first magnet portion facing the first claw-shaped magnetic pole, has the second rotor core side as the second magnetic pole and the first rotor core side as the first rotor portion in the axial direction. The first magnet portion that is magnetized to become the first magnetic pole and faces the second claw-shaped magnetic pole is magnetized in the axial direction with the second rotor core side as the first magnetic pole and the first rotor core side as the second magnetic pole. ,
Each of the second magnet portions of the second annular auxiliary magnet, the second magnet portion facing the second claw-shaped magnetic pole, has the second rotor core side as the second magnetic pole and the first rotor core side as the second rotor portion in the axial direction. The second magnet portion that is magnetized to become the first magnetic pole and faces the first claw-shaped magnetic pole is magnetized in the axial direction with the second rotor core side as the first magnetic pole and the first rotor core side as the second magnetic pole. Rotor characterized by being.   A three-phase rotor, wherein the rotor according to any one of claims 1 to 11 is laminated in the axial direction to form a U-phase rotor, a V-phase rotor, and a W-phase rotor.   A motor comprising the rotor according to claim 1. It is a rotation detection method of the motor provided with the rotor of any one of Claims 1-12, or a three-phase rotor, Comprising: At least any one annular auxiliary magnet of a 1st annular auxiliary magnet or a 2nd annular auxiliary magnet is used. A magnetic detector is arranged at an adjacent position, and the rotation of the motor is detected by detecting the passage of each magnet portion of the annular auxiliary magnet rotating with the rotation of the rotor or the three-phase rotor by the same magnetic detector. A method for detecting rotation of a motor.