JP2005312102A - Motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a motor utilizing reluctance torque in which torque ripple and cogging torque can be reduced. <P>SOLUTION: A buried magnet type motor comprises a stator 2 having a plurality of teeth 7 formed to extend toward the axial center at an equiangular interval in the circumferential direction and applied with winding, and a rotor 3 having a rotor core 11 provided with a plurality of non-magnetic path forming parts (containing holes 21a, 21b, 22a, 22b and V-shaped permanent magnets 12, 13) in the circumferential direction and rotary drives the rotor 3 using the reluctance torque as a part of driving force. Outer extensions 42a-42d are formed in proximity to the outer circumference of the rotor core 11 at the end part of the containing holes 21a, 21b, 22a, 22b. A pair of approximate extensions 42a and 42d are formed such that a part thereof (outer extension 42b, 42d) has a shape partially different from that of a pair of outer extensions 42b and 42c adjacent in the circumferential direction. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a motor using reluctance torque.

  An example of a motor that uses reluctance torque is an embedded magnet type motor. An embedded magnet type motor is a motor having a rotor in which a permanent magnet is embedded in a rotor core. In addition to a magnet torque between a rotating magnetic field generated by a stator and the rotor, a magnetic path formed in the rotor (magnetic path formation) High motor efficiency can be obtained by effectively utilizing the reluctance torque based on (1).

  As a rotor of such an embedded magnet type motor, a permanent magnet is accommodated and held in an accommodation hole formed in the rotor core, and a gap extending from the end of the permanent magnet so as to be close to the outer periphery of the rotor core (non-magnetic path end) Part) is formed as a part of the accommodation hole, and the leakage magnetic flux (magnetic flux that immediately goes from the N pole to its own S pole) is reduced by the gap (see, for example, Patent Document 1).

Patent Document 1 discloses a technique for reducing torque ripple by reducing the distance (thickness) between the outer peripheral surface of the rotor core and the inner surface of the air gap toward the adjacent permanent magnet side.
JP 2000-217287 A

  However, in the rotor as described above, since the shape of each air gap is the same, the state (relative relationship) with respect to the teeth of each magnetic path formed in each air gap is the same, and the motor torque based on each magnetic path is the same. In the same manner, there is a problem that torque ripple and cogging torque are increased (accumulated). This causes the motor vibration and noise to increase. The same problem occurs in a motor (reluctance motor) that uses only reluctance torque as a driving force.

  The present invention has been made to solve the above problems, and an object of the present invention is to provide a motor that can reduce torque ripple and cogging torque in a motor that uses reluctance torque.

  According to the first aspect of the present invention, a stator having a substantially cylindrical shape and wound around a plurality of teeth formed so as to extend toward the center of the shaft at equal circumferential intervals, and the stator A motor that is rotatably housed inside and has a rotor core having a plurality of non-magnetic path forming portions provided in the circumferential direction, and that rotates the rotor using at least part of a reluctance torque as a driving force. The magnetic path forming portion has non-magnetic path end portions that are close to the outer periphery of the rotor core, and a pair of non-magnetic path end portions that are adjacent to the non-magnetic path forming portion adjacent in the circumferential direction are It has the structure formed in the different shape with respect to a pair of non-magnetic path edge part adjacent to a direction.

According to a second aspect of the present invention, in the motor according to the first aspect, the nonmagnetic path end portions adjacent to each other in the circumferential direction are formed in different shapes.
According to a third aspect of the present invention, in the motor according to the first or second aspect, each of the pair of nonmagnetic path end portions and the pair of nonmagnetic path end portions adjacent to each other in the circumferential direction is The nonmagnetic path end portions are formed in the same shape, and the other nonmagnetic path end portions are formed in different shapes.

  According to a fourth aspect of the present invention, in the motor according to the first aspect, the pair of non-magnetic path end portions and the pair of non-magnetic path end portions adjacent to each other in the circumferential direction include the respective non-magnetic paths. The road end portions are all formed in different shapes.

  According to a fifth aspect of the present invention, in the motor according to the first aspect, adjacent nonmagnetic path end portions of the nonmagnetic path forming portions adjacent in the circumferential direction are formed in the same shape, and the pair of nonmagnetic paths. One and the other non-magnetic path end at the road end are formed to be different from each other by the same amount as the other non-magnetic path end at the pair of non-magnetic path ends adjacent in the circumferential direction. .

  According to a sixth aspect of the present invention, in the motor according to any one of the first to fifth aspects, the pair of non-magnetic path ends and the pair of non-magnetic path ends adjacent in the circumferential direction Are alternately formed over the entire circumference of the rotor core.

  According to a seventh aspect of the present invention, in the motor according to any one of the first to sixth aspects, the non-magnetic path forming portion is disposed in a housing hole formed in the rotor core and the housing hole. It is a permanent magnet, The said non-magnetic path edge part is a part of said accommodating hole in which the said permanent magnet is not arrange | positioned.

  According to an eighth aspect of the present invention, there is provided a stator in which a winding is wound around a plurality of teeth that are formed in a substantially cylindrical shape and extend toward the axis center at equal circumferential intervals. A motor that is rotatably housed inside and has a rotor core having a plurality of non-magnetic path forming portions provided in the circumferential direction, and that rotates the rotor using at least part of a reluctance torque as a driving force. The magnetic path forming portion has non-magnetic path end portions that are close to the outer periphery of the rotor core, and the adjacent non-magnetic path end portions of the non-magnetic path forming portions adjacent in the circumferential direction are formed in different shapes. It has the structure made.

  In a ninth aspect of the present invention, a stator having a substantially cylindrical shape and windings wound around a plurality of teeth formed to extend toward the axis center at equal circumferential intervals, and the stator A motor that is rotatably housed inside and has a plurality of rotor cores in the axial direction in which a plurality of non-magnetic path forming portions are provided in the circumferential direction, and drives the rotor to rotate by using reluctance torque as at least part of the driving force The non-magnetic path forming portion has a non-magnetic path end portion whose both end portions are close to the outer periphery of the rotor core, and a pair of the non-magnetic path end portions adjacent to the non-magnetic path forming portion adjacent in the circumferential direction. The portion has a configuration formed in a different shape with respect to the pair of non-magnetic path end portions in different rotor cores.

(Function)
According to the first aspect of the present invention, the pair of non-magnetic path ends adjacent to each other in the circumferential direction are different from the pair of non-magnetic path ends adjacent in the circumferential direction. Since it has a configuration formed in a shape, the pulsation (variation) of the motor torque becomes smooth, and torque ripple and cogging torque are reduced.

  According to the invention described in claim 2, since the non-magnetic path end portions adjacent to each other in the circumferential direction are formed in different shapes, the pulsation of the motor torque at that portion (Fluctuation) becomes smooth, and torque ripple and cogging torque are reduced.

  According to the third aspect of the present invention, the pair of non-magnetic path ends and the pair of non-magnetic path ends adjacent to each other in the circumferential direction are formed in the same shape. However, by forming each other non-magnetic path end in a different shape, the pair of non-magnetic path ends have a different shape relative to the pair of non-magnetic path ends adjacent in the circumferential direction. It is formed.

  According to the fourth aspect of the present invention, the pair of non-magnetic path ends and the pair of non-magnetic path ends adjacent to each other in the circumferential direction are all formed in different shapes. By doing so, the pair of non-magnetic path end portions are formed in different shapes with respect to the pair of non-magnetic path end portions adjacent in the circumferential direction.

  According to invention of Claim 5, the non-magnetic path edge parts which the said non-magnetic path formation part adjacent to the circumferential direction adjoins are formed in the same shape. The one and other non-magnetic path ends of the pair of non-magnetic path ends are the same as the one and the other non-magnetic path ends of the pair of non-magnetic path ends adjacent to each other in the circumferential direction. By being formed so as to be different from each other, the pair of non-magnetic path end portions are formed in different shapes with respect to the pair of non-magnetic path end portions adjacent in the circumferential direction.

  According to the invention described in claim 6, the pair of non-magnetic path end portions and the pair of non-magnetic path end portions adjacent in the circumferential direction are alternately formed over the entire circumference of the rotor core. The pulsation (variation) of the motor torque is smooth over the entire circumference of the rotor core, and torque ripple and cogging torque are reduced.

  According to the seventh aspect of the present invention, the non-magnetic path forming portion is a housing hole formed in the rotor core and a permanent magnet disposed in the housing hole, and the non-magnetic path end is the permanent magnet. Therefore, the rotor can be rotationally driven with high motor efficiency using the reluctance torque and the magnet torque generated by the permanent magnet as a driving force.

  According to the eighth aspect of the invention, since the nonmagnetic path end portions adjacent to each other in the circumferential direction are formed in different shapes, the motor torque pulsation in that portion is formed. (Fluctuation) becomes smooth, and torque ripple and cogging torque are reduced.

  According to the ninth aspect of the present invention, the pair of nonmagnetic path end portions adjacent to each other in the circumferential direction adjacent to the nonmagnetic path forming portion is different from the pair of nonmagnetic path end portions in the different rotor cores. Since it has the structure formed in the different shape, the pulsation (fluctuation) of motor torque becomes smooth, and a torque ripple and a cogging torque are reduced.

  As described above in detail, according to the present invention, it is possible to provide a motor that can reduce torque ripple and cogging torque in a motor that uses reluctance torque.

  Hereinafter, an embodiment in which the present invention is embodied in an interior magnet type motor will be described with reference to FIGS. As shown in FIG. 1, the embedded magnet type motor includes a housing 1, a stator 2, and a rotor 3.

  The housing 1 includes a substantially bottomed cylindrical case 4 and a lid 5 for closing the opening (the lower end in FIG. 1) of the case 4. The stator 2 is fixed to the inner peripheral surface of the case 4, and the rotor 3 is rotatable to the inside of the stator 2 by supporting the rotating shaft 6 by bearings 4 a and 5 a provided on the case 4 and the lid 5. Is housed in.

  The stator 2 is formed in a substantially cylindrical shape, and has a stator core 8 having a plurality of teeth 7 (see FIG. 3) formed so as to extend toward the axis center at equal circumferential intervals, and an insulator 9 ( 1) and a winding 10 wound via the wire. In the present embodiment, 60 teeth 7 are formed. In FIG. 3, the insulator 9 and the winding 10 are not shown. The winding 10 is wound around the tooth 7 by distributed winding.

  As shown in FIG. 1, the rotor 3 includes the rotating shaft 6, the rotor core 11, and V-shaped permanent magnets 12 and 13 (see FIGS. 2 and 3) as permanent magnets. The rotor core 11 of the present embodiment is formed by laminating a plurality of disk-shaped core sheets. In addition, in FIG.1 and FIG.2, illustration of the boundary line of a several core sheet | seat is abbreviate | omitted. A central hole 11 a into which the rotary shaft 6 is fitted is formed at the axial center of the rotor core 11. FIG. 2 is a schematic perspective view of the rotor 3 excluding the rotating shaft 6.

  As shown in FIGS. 2 and 3, the rotor core 11 has 10 pairs of receiving holes 21a, 21b to 30a, 30b that penetrate in the axial direction and have a substantially V-shape projecting radially inward in the circumferential direction. It is formed side by side. And in the rotor core 11, the magnetic path formation parts 31-40 extended in a radial direction between the said V-shaped adjacent are formed. In addition, at both ends of each of the receiving holes 21a, 21b to 30a, 30b, there are an inner extending portion 41 and an outer portion that extend to reduce leakage magnetic flux (magnetic flux that immediately goes from the N pole of the magnet toward its own S pole). Extension parts 42a-42d are formed (as a part of hole) (refer to Drawing 3 and Drawing 4).

  And in the accommodation holes 21a, 21b to 30a, 30b (excluding the inner extending portion 41 and the outer extending portions 42a to 42d), the V-shaped permanent magnet 12 is arranged in a substantially V-shape projecting radially inward. 13 are accommodated and held. In the present embodiment, the V-shaped permanent magnets 12 and 13 are substantially V-shaped by accommodating a pair of quadrangular prism-shaped permanent magnets 12a, 12b, 13a, and 13b in the accommodating holes 21a, 21b to 30a, and 30b. Arranged. The adjacent V-shaped permanent magnets 12 and 13 are set so that the N pole and the S pole are reversed. For example, the V-shaped permanent magnet 12 (permanent magnets 12a and 12b) has an N-pole on the radially outer side and the V-shaped permanent magnet 13. (Permanent magnets 13a, 13b) are set to the S pole on the outside in the radial direction.

  And the circumferential direction center L1 in one magnetic path formation part 31, 33, 35, 37, 39 adjacent to the circumferential direction was in the serial state in the radial direction with circumferential direction center LT of the teeth 7 (refer FIG. 3). Thus, the circumferential center L2 of the other magnetic path forming portions 32, 34, 36, 38, and 40 adjacent in the circumferential direction is set so as to be shifted in the circumferential direction with respect to the circumferential center LT of the teeth 7. Specifically, the magnetic path forming portions 31 to 40 are formed so as to repeat an interval of 5.5 slots and an interval of 6.5 slots in the circumferential direction, and the receiving holes 21a, 21b to 30a, 30b and the V-shaped permanent magnets. 12 and 13 (permanent magnets 12a, 12b, 13a and 13b) are formed in an angle corresponding to the interval between the magnetic path forming portions 31 to 40 formed as described above. In the present embodiment, the receiving holes 21a, 21b to 30a, 30b and the V-shaped permanent magnets 12, 13 constitute a plurality of non-magnetic path forming portions, and the outer periphery of the rotor core 11 at both ends of each non-magnetic path forming portion. The outer extending portions 42a to 42d that are close to (the V-shaped permanent magnets 12 and 13 are not disposed) constitute non-magnetic path end portions.

  Here, a pair of non-magnetic path end portions (a pair of outer extending portions) adjacent to each other in the circumferential direction are adjacent to a pair of non-magnetic path ends adjacent in the circumferential direction. They are formed in different shapes. That is, as shown in FIG. 4, at least a part of the pair of adjacent outer extending portions 42a and 42d adjacent to each other is formed in a shape different from the pair of outer extending portions 42b and 42c adjacent in the circumferential direction. .

  More specifically, in the present embodiment, the outer extending portions 42a to 42d adjacent in the circumferential direction are formed in different shapes (asymmetric) in the vicinity of each other in the circumferential direction. That is, the outer extending portion 42a and the outer extending portion 42d are formed in different shapes (asymmetric), and the outer extending portion 42b and the outer extending portion 42c are formed in different shapes (asymmetric). The pair of outer extending portions 42a and 42d and the pair of outer extending portions 42b and 42c adjacent to each other in the circumferential direction are formed in the same shape. The other outer extending portions 42b and 42d are formed in different shapes. As a result, the pair of outer extending portions 42a and 42d are formed in different shapes from the pair of outer extending portions 42b and 42c (the outer extending portion 42b and the outer extending portion 42d). In the present embodiment, the outer extending portion 42a to the outer extending portion 42d are sequentially repeated over the entire circumference of the rotor core 11 (the pair of outer extending portions 42d and 42a and the pair of outer extending portions). The portions 42b and 42c are alternately formed. In the present embodiment, the outer extending portions 42a and 42c are set to have a larger circumferential width than the outer extending portion 42b, and the outer extending portion 42b is set to have a larger circumferential width than the outer extending portion 42d. Yes.

In the embedded magnet type motor configured as described above, the rotor 3 can be rotationally driven with high motor efficiency using the reluctance torque and the magnet torque as driving forces.
Next, characteristic effects of the above embodiment will be described below.

  (1) A pair of adjacent outer extending portions 42a and 42d is at least partially (outer extending portion 42b and outer extending portion 42d) with respect to a pair of outer extending portions 42b and 42c adjacent in the circumferential direction. They are formed in different shapes. Therefore, the pair of outer extending portions 42a and 42d and the pair of outer extending portions 42b and 42c (in pairs) have different states (relative relationships) with respect to the teeth 7. Therefore, the pulsation (variation) of the motor torque becomes smooth, and torque ripple and cogging torque are reduced. As a result, vibration and noise of the embedded magnet type motor can be reduced.

  (2) The adjacent outer extending portion 42a and the outer extending portion 42d are formed in different shapes (asymmetric), and the outer extending portion 42b and the outer extending portion 42c are formed in different shapes (asymmetric). The pulsation (variation) of the motor torque in each part becomes smooth, and the torque ripple and the cogging torque are reduced.

  (3) Since the pair of outer extending portions 42 a and 42 d and the pair of outer extending portions 42 b and 42 c are alternately formed over the entire circumference of the rotor core 11, the motor extends over the entire circumference of the rotor core 11. Torque pulsation (variation) becomes smooth, and torque ripple and cogging torque are reduced.

  (4) The state where the circumferential center L1 in one of the magnetic path forming portions 31, 33, 35, 37, 39 adjacent in the circumferential direction is in series with the circumferential center LT of the teeth 7 in the radial direction (see FIG. 3). ), The circumferential center L2 of the other magnetic path forming portions 32, 34, 36, 38, 40 adjacent in the circumferential direction is set so as to be shifted in the circumferential direction with respect to the circumferential center LT of the tooth 7. Thereby, each circumferential direction center L1, L2 in the adjacent magnetic path formation part and the circumferential direction center LT of the teeth 7 are not simultaneously in series in the radial direction. Therefore, it is prevented that a linear coil magnetic flux flow is simultaneously formed (generated) in adjacent magnetic path forming portions, and torque ripple and cogging torque are reduced.

The above embodiment may be modified as follows.
In the above embodiment, the pair of outer extending portions 42a and 42d and the pair of outer extending portions 42b and 42c adjacent to each other in the circumferential direction have the same shape as one of the outer extending portions 42a and 42c. The other outer extending portions 42b and 42d are formed in different shapes. However, the present invention is not limited to this. That is, even if it changes to another structure so that it may have a structure in which a pair of adjacent outer extension part has a shape in which at least one part differs with respect to a pair of outer extension part adjacent to the circumferential direction. Good.

  For example, the adjacent outer extending portions are formed in the same shape (symmetric), and one of the pair of outer extending portions and the other outer extending portion are connected to one of the pair of outer extending portions adjacent in the circumferential direction. And the other outer extending portions may be formed so as to differ by the same amount. If it describes with the code | symbol corresponding to the outer side extension parts 42a-42d of the said embodiment, the outer side extension part 42d and the outer side extension part 42a will be formed in the same shape (symmetric), and the outer side extension part 42b and the outer side extension part will be provided. The part 42c may be formed in the same shape (symmetric), and the outer extension part 42b with respect to the outer extension part 42d and the outer extension part 42c with respect to the outer extension part 42a may be formed to be different by the same amount.

  Further, for example, as shown in FIG. 5, the outer extending portions 43 a to 43 d in the pair of outer extending portions 43 a and 43 d and the pair of outer extending portions 43 b and 43 c adjacent in the circumferential direction are all different. You may form in a shape. In this example (see FIG. 5), the outer extending portion 43c has a larger circumferential width than the outer extending portion 43a, and the outer extending portion 43a has a larger circumferential width than the outer extending portion 43b. The outer extending portion 43b is set to have a larger circumferential width than the outer extending portion 43d. In this example, the outer extending portion 43a to the outer extending portion 43d are sequentially repeated over the entire circumference of the rotor core 11 (a pair of outer extending portions 43d and 43a and a pair of outer extending portions 43b). , 43c alternately).

  Further, for example, as schematically shown in FIG. 6A, the above-described outer extending portion (for each of the plurality of blocks A1 to A5 in the circumferential direction corresponding to the pair of V-shaped permanent magnets (12, 13)) ( You may form so that it may become a shape (pattern B1-B5) from which a nonmagnetic path edge part differs.

  Further, for example, as schematically shown in FIG. 6B, a part of the blocks C1 to C5 in the circumferential direction corresponding to the pair of V-shaped permanent magnets (12, 13) (one in this example). Only the block C5 may be formed to have a shape (pattern D2) of the outer extending portion different from the shape of the outer extending portion (pattern D1) of the other blocks C1 to C4.

Further, for example, as schematically shown in FIG. 6C, all the outer extending portions (blocks E1 to E20) in the rotor core may be formed in different shapes (patterns F1 to F20).
In the above embodiment, the rotor core 11 is embodied as one (same shape in the axial direction), but may be embodied as a rotor core having a plurality of rotor cores in the axial direction (rotor). In this case, a pair of adjacent outer extending portions (non-magnetic path end portions) are formed in different shapes with respect to the pair of outer extending portions (non-magnetic path end portions) in different rotor cores (in the axial direction). Also good.

  For example, as schematically shown in FIG. 7A, in a rotor having five rotor cores G1 to G5 arranged in parallel in the axial direction, a plurality of outer extending portions (in the circumferential direction) in each rotor core G1 to G5. The non-magnetic path end portions may have the same shape, and the outer extending portions (non-magnetic path end portions) may be formed in different shapes (patterns H1 to H5) for each of the rotor cores G1 to G5. In this example, the axial lengths of the rotor cores G1 to G5 are the same.

  Further, for example, as schematically shown in FIG. 7B, in a rotor having two rotor cores I1 and I2 arranged in parallel in the axial direction, the axial lengths of the rotor cores I1 and I2 may be varied. Good. In this example, a plurality of outer extending portions (non-magnetic path end portions) are formed in the same shape in the circumferential direction in each of the rotor cores I1 and I2, and the outer extending portions (non-magnetic path end portions) are respectively provided for the rotor cores I1 and I2. Are formed in different shapes (patterns J1, J2).

  -In above-mentioned embodiment, although the permanent magnet arrange | positioned at the rotor core 11 was set to the V-shaped permanent magnets 12 and 13, it is not limited to this, You may change a permanent magnet into another shape. In this case, of course, the accommodation holes 21a, 21b to 30a, 30b are also changed according to the shape of the permanent magnet.

  For example, as schematically shown in FIG. 8A, the permanent magnets disposed on the rotor core 51 may be simply changed to linear permanent magnets 52 along the circumferential direction. In this example, the receiving holes 53 and 54 and the permanent magnet 52 constitute a plurality of non-magnetic path forming portions, and the rotor core 51 is a part of the receiving holes 53 and 54 at both ends of each non-magnetic path forming portion. Outer extending portions 53a, 53b, 54a, 54b that are close to the outer periphery (the permanent magnet 52 is not disposed) constitute non-magnetic path end portions. The outer extending portions 53a, 53b, 54a, and 54b have circumferential widths set in the same manner as the outer extending portions 42a, 42b, 42c, and 42d of the above-described embodiment. In FIG. 8A, only about half of the rotor in which four permanent magnets 52 are arranged in the circumferential direction is shown, and similarly formed portions (portions shifted in the circumferential direction by 180 degrees) are shown. Is omitted.

  Further, for example, as schematically shown in FIG. 8B, the permanent magnet disposed on the rotor core 61 may be changed to a curved permanent magnet 62 having a radially inner side convex. In this example, the receiving holes 63 and 64 and the permanent magnet 62 constitute a plurality of non-magnetic path forming portions, and the rotor core 61 is a part of the receiving holes 63 and 64 at both ends of each non-magnetic path forming portion. Outer extending portions 63a, 63b, 64a, and 64b that are close to the outer periphery (where no permanent magnet 62 is disposed) constitute nonmagnetic path ends. The outer extending portions 63a, 63b, 64a, and 64b have circumferential widths set in the same manner as the outer extending portions 42a, 42b, 42c, and 42d of the above-described embodiment. Further, in FIG. 8B, only about half of the rotor in which four permanent magnets 62 are arranged in the circumferential direction is shown, and similarly formed portions (portions having a shape shifted by 180 degrees in the circumferential direction). Is omitted.

  Further, for example, as schematically shown in FIG. 8C, the permanent magnet disposed in the rotor core 71 is composed of a linear portion along the circumferential direction and an extending portion extending radially outward from both ends thereof. The permanent magnet 72 may be changed. In this example, the receiving holes 73 and 74 and the permanent magnet 72 constitute a plurality of non-magnetic path forming portions, and the rotor core 71 is a part of the receiving holes 73 and 74 at both ends of each non-magnetic path forming portion. Outer extending portions 73a, 73b, 74a, and 74b that are close to the outer periphery (where no permanent magnet 72 is disposed) constitute non-magnetic path end portions. The outer extending portions 73a, 73b, 74a, and 74b have circumferential widths set in the same manner as the outer extending portions 42a, 42b, 42c, and 42d of the above-described embodiment. Further, in FIG. 8C, only about half of the rotor in which the four permanent magnets 72 are arranged in the circumferential direction is shown, and a portion that is similarly formed (a portion that is shifted by 180 degrees in the circumferential direction) is shown. Is omitted.

  In the above embodiment, the receiving holes 21a, 21b to 30a, 30b and the V-shaped permanent magnets 12 and 13 constitute the non-magnetic path forming portion. However, the magnetic path (magnetic path forming for generating the reluctance torque) Part) may be changed to another configuration.

  For example, as shown in FIG. 9, the nonmagnetic path forming portions may be gaps 81 to 90 as nonmagnetic portions formed in a plurality in the circumferential direction of the rotor core 80. That is, it may be embodied in a so-called reluctance motor. The voids 81 to 90 in this example are formed in a curved shape in which the radially inner side is convex. And the outer extension parts 91a-91d which are a part of the space | gaps 81-90, and adjoin to the rotor core 80 outer periphery in the both ends constitute the nonmagnetic path edge part. Further, the outer extending portions 91a, 91b, 91c, and 91d that are sequentially formed and repeatedly formed in the circumferential direction are respectively circumferential widths similar to the outer extending portions 42a, 42b, 42c, and 42d of the above-described embodiment. Is set. In this way, the rotor can be rotationally driven using only the reluctance torque as a driving force, while the rotor has a simple structure (without using a permanent magnet).

  -You may change to the structure by which a permanent magnet is arrange | positioned also in the outer side extension part (non-magnetic path edge part) of the said embodiment (so that there may be no clearance gap). In this case, it is necessary to change the shape of the permanent magnet and use a plurality of types of permanent magnets.

  In the above embodiment, the pair of adjacent outer extending portions 42a and 42d are formed in a shape that is partially different from the pair of outer extending portions 42b and 42c adjacent in the circumferential direction. Even if they have the same shape as each other, the same effect as the effect (2) of the above embodiment can be obtained if the adjacent outer extending portions are formed in different shapes (asymmetric).

  In the above embodiment, the circumferential center L1 in one of the magnetic path forming portions 31, 33, 35, 37, 39 adjacent in the circumferential direction is in series with the circumferential center LT of the teeth 7 in the radial direction. Thus, although the circumferential center L2 in the other magnetic path forming portions 32, 34, 36, 38, 40 is shifted in the circumferential direction with respect to the circumferential center LT of the teeth 7, the present invention is not limited to this. That is, the configuration may be such that each circumferential center in adjacent magnetic path forming portions and the circumferential center of the teeth are simultaneously in series in the radial direction.

  In the above embodiment, the rotor core 11 is formed by laminating a plurality of disk-shaped core sheets. However, the rotor core 11 may be formed in the same shape, for example, by sintering magnetic powder. Also good.

The technical idea that can be grasped from the above embodiments will be described below together with the effects thereof.
(A) In the motor according to any one of claims 1 to 6, the non-magnetic path forming portion is a permanent magnet disposed in an accommodation hole formed in the rotor core (so that there is no gap). A motor characterized by being. If it does in this way, a rotor can be rotationally driven with high motor efficiency by using reluctance torque and magnet torque by a permanent magnet as driving force.

  (B) In the motor according to any one of claims 1 to 6, the non-magnetic path forming portion is a non-magnetic portion formed in the rotor core, and the rotor is driven only by reluctance torque. A motor characterized by being driven to rotate. In this way, the rotor can be rotationally driven using only the reluctance torque as the driving force, while the rotor has a simple structure.

  (C) The motor according to any one of claims 1 to 7, wherein the rotor core has a circumferential center in a magnetic path forming portion formed between the pair of non-magnetic path end portions. The center in the circumferential direction of the magnetic path forming portion adjacent in the circumferential direction is set so as to be shifted in the circumferential direction with respect to the circumferential center of the teeth in a state in which the center in the radial direction and the radial direction are in series. motor. If it does in this way, each circumference direction center in an adjacent magnetic path formation part and the circumference direction center of teeth will not be in a serial state in the diameter direction simultaneously, respectively. Therefore, it is prevented that a linear coil magnetic flux flow is simultaneously formed (generated) in adjacent magnetic path forming portions, and torque ripple and cogging torque are reduced.

The side sectional view of the interior magnet type motor in this embodiment. The schematic perspective view of the rotor except a rotating shaft in this Embodiment. The top view of the stator and rotor in this Embodiment. FIG. 2 is a partially enlarged plan view of a stator and a rotor in the present embodiment. The top view of the rotor in another example. (A)-(c) The schematic plan view of the rotor in another example. (A) (b) The model perspective view of the rotor in another example. (A)-(c) The partial schematic plan view of the rotor in another example. The top view of the rotor in another example.

Explanation of symbols

  2 ... Stator, 3 ... Rotor, 7 ... Teeth, 10 ... Winding, 11, 51, 61, 71, 80, G1-G5, I1, I2 ... Rotor core, 12, 13 ... Part of the non-magnetic path forming part Constructing V-shaped permanent magnets (permanent magnets), 21a, 21b-30a, 30b, 53, 54, 63, 64, 73, 74 ... receiving holes constituting a part of the non-magnetic path forming portion, 42a-42d, 43a ˜43d, 53a, 53b, 54a, 54b, 63a, 63b, 64a, 64b, 73a, 73b, 74a, 74b, 91a to 91d... Externally extending portion (non-magnetic path end).

Claims (9)

A stator in which a winding is wound around a plurality of teeth that are formed in a substantially cylindrical shape and extend toward the axis center at equal angular intervals in the circumferential direction;
A motor having a rotor core rotatably accommodated inside the stator and having a plurality of non-magnetic path forming portions provided in a circumferential direction, and rotating the rotor with reluctance torque as at least part of a driving force. ,
The non-magnetic path forming portion has a non-magnetic path end portion whose both end portions are close to the outer periphery of the rotor core,
A pair of non-magnetic path end portions adjacent to each other in the circumferential direction adjacent to the non-magnetic path forming portion has a configuration formed in a different shape with respect to a pair of non-magnetic path end portions adjacent in the circumferential direction. Characteristic motor. The motor according to claim 1,
A motor having a configuration in which non-magnetic path end portions adjacent to each other in the circumferential direction are formed in different shapes. The motor according to claim 1 or 2,
The pair of non-magnetic path end portions and the pair of non-magnetic path end portions adjacent to each other in the circumferential direction are formed such that one of the non-magnetic path end portions has the same shape, and the other non-magnetic path end portion is A motor characterized in that magnetic path end portions are formed in different shapes. The motor according to claim 1,
The pair of non-magnetic path end portions and the pair of non-magnetic path end portions adjacent to each other in the circumferential direction are all formed in different shapes. The motor according to claim 1,
Non-magnetic path end portions adjacent to each other in the circumferential direction are formed in the same shape,
One and the other non-magnetic path ends of the pair of non-magnetic path ends are different from each other by the same amount between one and the other non-magnetic path ends of the pair of non-magnetic path ends adjacent in the circumferential direction. A motor characterized by being formed as described above. The motor according to any one of claims 1 to 5,
The pair of non-magnetic path end portions and the pair of non-magnetic path end portions adjacent to each other in the circumferential direction are alternately formed over the entire circumference of the rotor core. The motor according to any one of claims 1 to 6,
The non-magnetic path forming portion is a housing hole formed in the rotor core and a permanent magnet disposed in the housing hole, and the non-magnetic path end portion is a portion of the housing hole in which the permanent magnet is not disposed. A motor characterized by being a part. A stator in which a winding is wound around a plurality of teeth that are formed in a substantially cylindrical shape and extend toward the axis center at equal angular intervals in the circumferential direction;
A motor having a rotor core rotatably accommodated inside the stator and having a plurality of non-magnetic path forming portions provided in a circumferential direction, and rotating the rotor with reluctance torque as at least part of a driving force. ,
The non-magnetic path forming portion has a non-magnetic path end portion whose both end portions are close to the outer periphery of the rotor core,
A motor having a configuration in which non-magnetic path end portions adjacent to each other in the circumferential direction are formed in different shapes. A stator in which a winding is wound around a plurality of teeth that are formed in a substantially cylindrical shape and extend toward the axis center at equal angular intervals in the circumferential direction;
A rotor that is rotatably accommodated inside the stator, and has a plurality of rotor cores in the axial direction in which a plurality of non-magnetic path forming portions are provided in the circumferential direction, and the rotor is rotated with reluctance torque as at least part of the driving force. In the motor to drive,
The non-magnetic path forming portion has a non-magnetic path end portion whose both end portions are close to the outer periphery of the rotor core,
A pair of the non-magnetic path end portions adjacent to each other in the circumferential direction adjacent to the non-magnetic path forming portion are configured to have different shapes with respect to the pair of non-magnetic path end portions in the different rotor cores. Characteristic motor.

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