JP2017055501A - Permanent magnet motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a permanent magnet motor capable of improving efficiency.SOLUTION: A stator 110 has a york section 111 extended along a peripheral direction and a teeth section 112 extended along a radial direction. In a rotor 120, main magnetic pole sections [A] to [D] and auxiliary magnetic pole sections [AB] to [DA] are alternately arranged along the peripheral direction. A magnet insertion section 130 formed like a trapezoidal shape so that a center portion along the peripheral direction is projected to the outer peripheral surface 121 side of the rotor 120 as compared with both end portions is formed on each of the main magnetic pole sections [A] to [D]. Permanent magnet pieces 141 to 143 are inserted into the magnet insertion section 130. The outer peripheral surface 121 of the rotor 120 is constituted of first outer peripheral sections 121a each formed like an arc shape having a center of curvature on a d axis of the main magnetic pole section and second outer peripheral sections 121b each having a center of curvature on a q axis of the auxiliary magnetic pole section and formed like an arc shape of a radius of curvature larger than a radius of curvature of the first outer peripheral section 121a.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a permanent magnet motor including a rotor in which a permanent magnet is disposed, and more particularly to a technique for improving the efficiency of the permanent magnet motor.

For example, a permanent magnet motor disclosed in Patent Document 1 is used as an electric motor for driving various devices such as a compressor mechanism of a compressor, a vehicle, and an in-vehicle device mounted on the vehicle.
The permanent magnet motor disclosed in Patent Document 1 includes a stator and a rotor that is rotatably disposed in the stator via a gap (air gap). In the rotor, main magnetic pole portions and auxiliary magnetic pole portions are alternately arranged along the circumferential direction. A magnet insertion hole extending along the circumferential direction is formed in the main magnetic pole portion, and a permanent magnet is inserted into the magnet insertion hole. The stator has a yoke portion extending along the circumferential direction and a teeth portion extending from the yoke portion along the radial direction in the rotation center direction. A tooth tip surface is formed on the tip side of the tooth portion. A slot is formed by teeth portions adjacent in the circumferential direction, and a stator winding is inserted into the slot. The outer peripheral surface of the rotor is formed in a circular shape when viewed in a cross section perpendicular to the axial direction. That is, the gap between the stator and the rotor (the gap between the teeth tip surface of the teeth portion of the stator and the outer peripheral surface of the rotor) is set to be constant.
The permanent magnet motor disclosed in Patent Document 1 can use a magnet torque by a permanent magnet and a reluctance torque by saliency.

Japanese Patent Laying-Open No. 2015-47212

In the permanent magnet motor disclosed in Patent Document 1, the gap between the tooth tip surface of the teeth portion of the stator and the outer peripheral surface of the rotor is constant. For this reason, magnetic flux generated from both end portions of the permanent magnet along the circumferential direction (hereinafter referred to as “end portions of the permanent magnet”) flows to the teeth portion of the stator via the outer peripheral surface of the auxiliary magnetic pole portion. The amount of magnetic flux flowing through the magnetic pole part, that is, the amount of effective magnetic flux decreases. Further, the magnetic flux generated by the current flowing through the stator winding flows on the outer peripheral surface of the auxiliary magnetic pole portion, and the magnetic flux is concentrated on both end portions of the permanent magnet to demagnetize the permanent magnet. As a method of coping with the decrease in the effective magnetic flux amount and the demagnetization of the permanent magnet, for example, a method of increasing the current flowing through the stator winding can be considered. However, increasing the current flowing through the stator winding increases the copper loss. As described above, in the permanent magnet motor disclosed in Patent Document 1, the amount of effective magnetic flux is reduced, and the magnetic flux is concentrated and demagnetized at both ends of the permanent magnet.
The present invention was devised in view of such points, and increases the amount of effective magnetic flux and prevents the magnetic flux from concentrating at both ends of the permanent magnet to improve the efficiency of the permanent magnet motor. With the goal.

One invention relates to a permanent magnet motor. The permanent magnet electric motor of the present invention includes a stator and a rotor arranged in the stator via a gap. In the rotor, main magnetic pole portions and auxiliary magnetic pole portions are alternately arranged along the circumferential direction.
A permanent magnet is disposed in the main magnetic pole portion. Various permanent magnets such as ferrite magnets, rare earth magnets, neodymium magnets containing terbium and dysprosium can be used as the permanent magnets. The permanent magnet is arranged in a projecting shape in which the central portion along the circumferential direction protrudes from the both end portions to the outer peripheral side of the rotor when viewed in a cross section perpendicular to the axial direction. As the projecting shape, various projecting shapes combining straight lines and curves can be selected. As an aspect which arrange | positions a permanent magnet in a protruding shape, the aspect which arrange | positions one permanent magnet piece which has a protruding cross section, and the aspect which arrange | positions several permanent magnet pieces which have cross sections, such as square shape, along a protruding shape Can be used. When arranging a plurality of permanent magnet pieces along the protruding shape, they may be arranged so that adjacent permanent magnet pieces are in contact with each other, or may be arranged so that adjacent permanent magnet pieces are separated from each other.
As a mode in which the permanent magnet is disposed in the main magnetic pole portion, a mode in which a magnet insertion portion is formed in the main magnetic pole portion and the permanent magnet is inserted in the magnet insertion portion is typically used. In this case, the magnet insertion portion is formed in a protruding shape in which the central portion along the circumferential direction protrudes from the both end portions to the outer peripheral side of the rotor. In addition, as an aspect which arrange | positions a permanent magnet in a main magnetic pole part, the aspect arrange | positioned with the adhesion | attachment method, the integral molding method, etc. can also be used.
A first space portion and a second space portion are formed between one end wall and the other end wall of the permanent magnet in the circumferential direction and the outer peripheral surface of the rotor. The first space portion and the second space portion can prevent the magnetic flux generated from both end portions of the permanent magnet along the circumferential direction from being short-circuited. In the case where the permanent magnet is composed of a plurality of permanent magnet pieces arranged along the circumferential direction, a space portion may or may not be formed between adjacent permanent magnet pieces.
In addition, the outer peripheral surface of the rotor is viewed from a cross section perpendicular to the axial direction, and the gap between the inner peripheral surface of the stator and the outer peripheral surface of the rotor is mainly spaced along the q axis of the auxiliary magnetic pole portion. It is formed to be longer than the interval along the d-axis of the magnetic pole part. Preferably, the outer peripheral surface of the rotor has a gap interval in a region on both sides of a portion where the outer peripheral surface of the rotor intersects with the q axis in a direction of a portion where the outer peripheral surface of the rotor intersects with the q axis. It is formed to gradually become longer. More preferably, the outer peripheral surface of the rotor is configured by combining outer peripheral portions formed in an arc shape. Of course, the outer peripheral surface of the rotor can be formed in various shapes combining curves and straight lines.
In the present invention, the permanent magnets of the main magnetic pole portion of the rotor are arranged in a protruding shape. Thereby, a magnet surface area increases and the amount of magnetic flux (effective magnetic flux amount) which flows through a main magnetic pole part increases. And since the electric current which flows into a stator winding | coil can be made small by the increase in the amount of magnetic fluxes, a copper loss can be reduced.
Further, the permanent magnets are arranged in a protruding shape protruding to the outer peripheral side. Thereby, the space | interval between the both ends along the circumferential direction of a permanent magnet and the outer peripheral surface of a rotor becomes small, and between the both ends of the said permanent magnet along the circumferential direction and the outer peripheral surface of a rotor. The reluctance torque generated by the magnetic flux passing through is reduced. By reducing the reluctance torque, the iron loss is reduced. On the other hand, since the distance between the permanent magnet and the outer peripheral surface of the rotor is reduced, the decrease in the amount of magnetic flux due to the armature reaction is greatly suppressed. Thereby, while being able to reduce an iron loss, the amount of magnetic flux (effective magnetic flux amount) can be increased and efficiency improves.

The outer peripheral surface of the rotor is formed such that the gap interval along the q axis of the auxiliary magnetic pole portion is longer than the gap interval along the d axis of the main magnetic pole portion. Thereby, compared with the case where the space | gap between the internal peripheral surface of a stator and the outer peripheral surface of a rotor is constant (the outer peripheral surface of a rotor is formed in the circular shape), it is from both ends of a permanent magnet. The magnetic flux generated can be used effectively (the amount of effective magnetic flux can be increased), and the magnetic flux flowing from the stator teeth to the rotor is prevented from concentrating on both ends of the permanent magnet. Can do.
Therefore, the permanent magnet motor of the present invention can improve the efficiency as compared with the conventional permanent magnet motor.
In one aspect of the invention, the outer peripheral surface of the rotor is alternately connected to the first outer peripheral portion that intersects the d-axis of the main magnetic pole portion and the second outer peripheral portion that intersects the q-axis of the auxiliary magnetic pole portion. Is formed. The first outer peripheral portion is formed in an arc shape having a center point on the d axis. The second outer peripheral portion has a center point on the q axis and is formed in an arc shape having a radius larger than the radius of the first outer peripheral portion. Preferably, the first outer peripheral portion is formed in an arc shape with the center of rotation as the center point, and the second outer peripheral portion is on the q axis and is on the opposite side of the second outer peripheral portion from the rotation center. It is formed in a circular arc shape with a point away from the center point.
In this embodiment, the outer peripheral surface of the rotor can be easily formed. Moreover, when the connection part of a 1st outer peripheral part and a 2nd outer peripheral part passes through the location which opposes a teeth part, the rapid change of the magnetic flux amount which flows into a teeth part can be suppressed. As a result, it is possible to prevent an increase in the harmonic component contained in the waveform of the induced voltage (electromotive force waveform) induced in the stator winding due to a sudden change in the amount of magnetic flux flowing through the tooth portion. The position of the rotor can be accurately detected based on the electromotive force waveform of the winding. Therefore, when using a sensorless control type control device that detects the position of the rotor based on the electromotive force waveform of the stator winding, it is possible to prevent a decrease in efficiency due to a decrease in the position detection accuracy of the rotor.
In another different form of one invention, the permanent magnet is arranged in a trapezoidal shape in which the central portion along the circumferential direction protrudes from the both end portions to the outer peripheral side of the rotor.
By making the arrangement shape of the permanent magnet trapezoidal, the distance between the central portion of the permanent magnet along the circumferential direction (the straight portion corresponding to the upper base of the trapezoid) and the outer peripheral surface of the rotor is reduced. Can be small. Thereby, the fall of the effective magnetic flux amount by an armature reaction can be suppressed more.
In another different form of one invention, the permanent magnet is arranged in an arc shape in which the central portion along the circumferential direction protrudes from the both ends to the outer peripheral side of the rotor.
By making the arrangement shape of the permanent magnet into an arc shape, the central portion (portion intersecting the d axis) of the permanent magnet along the circumferential direction can be arranged on the outer peripheral side of the rotor. That is, the space | interval between the center part along the circumferential direction of a permanent magnet and the outer peripheral surface of a rotor can be made small. Thereby, the fall of the effective magnetic flux amount by an armature reaction can be suppressed more. Furthermore, the magnetic flux generated from the permanent magnet changes smoothly along the circumferential direction by making the arrangement shape of the permanent magnet into an arc shape. Thereby, the harmonic component contained in an electromotive force waveform can be reduced more, and the iron loss resulting from the harmonic component contained in an electromotive force waveform can be reduced more.
In another different form of one invention, the permanent magnet is comprised by the several permanent magnet piece arrange | positioned along the circumferential direction via the bridge | bridging part. And between the end wall of one side along the circumferential direction of the permanent magnet piece arrange | positioned at the one end along the circumferential direction among several permanent magnet pieces, and 1st space between the outer peripheral surfaces of a rotor A second space is formed between the end wall on the other side along the circumferential direction of the permanent magnet piece arranged at the other end along the circumferential direction and the outer peripheral surface of the rotor. Yes.
In this embodiment, the permanent magnet is composed of a plurality of permanent magnet pieces, and a bridge portion is provided between the permanent magnet pieces. Thereby, the intensity | strength of the rotor with respect to a centrifugal force can be raised.
Other invention of this invention is related with an apparatus drive device. The device driving device of the present invention includes a device (for example, a compressor mechanism of a compressor, a vehicle, a vehicle-mounted device mounted on the vehicle) and an electric motor that drives the device, and is one of the permanent magnet motors described above as an electric motor. Is used.
The present invention has the same effect as the permanent magnet motor described above.

  In the present invention, the efficiency of the permanent magnet motor can be improved.

It is sectional drawing of 1st Embodiment of the permanent magnet electric motor of this invention. It is the elements on larger scale of FIG. It is the elements on larger scale of 2nd Embodiment of the permanent magnet electric motor of this invention. It is sectional drawing of 3rd Embodiment of the permanent magnet electric motor of this invention. It is the elements on larger scale of FIG. It is the elements on larger scale of 4th Embodiment of the permanent magnet electric motor of this invention. It is sectional drawing of 5th Embodiment of the permanent magnet electric motor of this invention. It is the elements on larger scale of FIG. It is the elements on larger scale of 6th Embodiment of the permanent magnet electric motor of this invention. It is sectional drawing of 7th Embodiment of the permanent magnet electric motor of this invention. It is the elements on larger scale of FIG. It is the elements on larger scale of 8th Embodiment of the permanent magnet electric motor of this invention. It is sectional drawing of 9th Embodiment of the permanent magnet electric motor of this invention. It is the elements on larger scale of FIG. It is the elements on larger scale of 10th Embodiment of the permanent magnet electric motor of this invention. It is sectional drawing of 11th Embodiment of the permanent magnet electric motor of this invention. It is the elements on larger scale of FIG. It is the elements on larger scale of 12th Embodiment of the permanent magnet electric motor of this invention. It is sectional drawing of 13th Embodiment of the permanent magnet electric motor of this invention. It is the elements on larger scale of FIG. It is the elements on larger scale of 14th Embodiment of the permanent magnet electric motor of this invention. It is sectional drawing of 15th Embodiment of the permanent magnet electric motor of this invention. It is the elements on larger scale of FIG. It is the elements on larger scale of 16th Embodiment of the permanent magnet electric motor of this invention.

Embodiments of a permanent magnet motor according to the present invention will be described below with reference to the drawings.
In this specification, the description of “axial direction” indicates the direction of the rotation center line passing through the rotation center of the rotor (rotating shaft) in a state where the rotor is rotatably arranged with respect to the stator. The description “circumferential direction” indicates a circumferential direction centered on the center of rotation when viewed in a cross section perpendicular to the axial direction in a state where the rotor is rotatably arranged with respect to the stator. The description “radial direction” indicates a direction passing through the center of rotation when viewed in a cross section perpendicular to the axial direction in a state where the rotor is rotatably arranged with respect to the stator. “D-axis” represents a line connecting the rotation center and the circumferential center point of the main magnetic pole portion, and “q-axis” represents a line connecting the rotation center and the circumferential center point of the auxiliary magnetic pole portion.
In addition, the “inner wall” and “outer wall” of the magnet insertion portion (magnet insertion hole) are arranged on the rotation center side of the radially opposed walls to form a portion for inserting a permanent magnet (permanent magnet piece). The outer wall and the wall disposed on the outer peripheral side of the rotor are represented by “the outer peripheral wall”, both end portions along the circumferential direction of the magnet insertion portion (the both end walls of the permanent magnet and the both end walls of the magnet insertion portion). Represents a wall formed in parallel (including “substantially parallel”) to the outer peripheral surface of the rotor to form a space portion, and “end wall” is an adjacent magnet insertion portion (magnet insertion hole) It represents the wall on the opposite side. The “inner wall” and “outer wall” of the permanent magnet (permanent magnet piece) are a wall and a rotor arranged on the rotation center side among the radially opposing walls in a state where the permanent magnet is inserted into the magnet insertion portion. The “end wall” represents a wall facing the adjacent permanent magnet (permanent magnet piece).
The description “parallel” is used to include “substantially parallel”.

  In addition, each embodiment of the permanent magnet motor of the present invention described below includes, for example, a compressor mechanism of a compressor provided in an air conditioner, a cooling device, a refrigeration device, and the like, a vehicle, and a vehicle mounted on the vehicle. It can be used as an electric motor for driving various known devices such as devices. That is, this invention can also be comprised as an apparatus drive device provided with an apparatus and the permanent magnet electric motor which drives an apparatus. Since the configuration of each device is known, the description thereof is omitted in this specification.

1 and 2 show a first embodiment of a permanent magnet motor of the present invention. FIG. 1 is a cross-sectional view of the permanent magnet motor 100 of the first embodiment viewed from a direction perpendicular to the axial direction, and FIG. 2 is a partially enlarged view of FIG. In this specification, in FIGS. 1 and 2, the clockwise direction is referred to as “one direction along the circumferential direction”, and the counterclockwise direction is referred to as “the other direction along the circumferential direction”. The same applies to each embodiment described below. Of course, the counterclockwise direction can also be referred to as “one direction” and the clockwise direction as “the other direction”.
In each embodiment, a 6-slot, 4-pole permanent magnet motor will be described. However, the number of slots and the number of poles of the permanent magnet motor of the present invention can be changed as appropriate.

The permanent magnet motor 100 of this embodiment includes a stator 110 and a rotor 120.
Stator 110 is constituted by a stator core in which a plurality of electromagnetic steel plates are laminated. The stator 110 has a yoke portion 111 extending along the circumferential direction and a teeth portion 112 extending from the yoke portion 111 in the radial center O direction when viewed in a cross section perpendicular to the axial direction. doing. The teeth portion 112 includes a tooth base portion 112a extending in the radial direction from the yoke portion 111, and a tooth tip portion 112b provided on the tip side (rotation center O side) of the tooth base portion 112a and extending in the circumferential direction. have. A tooth tip surface 113 is formed on the rotation center O side of the tooth tip 112b. The tooth front end surface 113 forms an “inner peripheral surface of the stator 110”.
A stator winding (not shown) is inserted into a slot 114 formed by the teeth 112 adjacent in the circumferential direction. In the present embodiment, the stator winding is inserted into the slot 114 using a concentrated winding method. Of course, a distributed winding method or the like can also be used.

The rotor 120 is constituted by a rotor core in which a plurality of electromagnetic steel plates are stacked. The rotor 120 has main magnetic pole portions [A] to [D] and auxiliary magnetic pole portions [AB] to [DA] arranged alternately along the circumferential direction when viewed in a cross section perpendicular to the axial direction. Magnet insertion portions 130 extending in the circumferential direction are formed in the main magnetic pole portions [A] to [D], and permanent magnets 140 are inserted into the magnet insertion portions 130.
The permanent magnets 140 inserted into the magnet insertion portions 130 of the main magnetic pole portions [A] to [D] are arranged so that the N-pole main magnetic pole portions and the S-pole main magnetic pole portions are alternately arranged along the circumferential direction. Magnetized. As a method for magnetizing the permanent magnet 140, a built-in magnetizing method in which a magnetizing current is passed through the stator winding in a state where the permanent magnet 140 is inserted into the magnet insertion portion 130 is used. Of course, a method of magnetizing the permanent magnet 140 before inserting it into the magnet insertion portion 130 can also be used.
Various permanent magnets can be used as the permanent magnet. For example, a ferrite magnet, a rare earth magnet, a neodymium magnet containing terbium or dysprosium, or the like can be used.
The rotor 120 has a rotation shaft insertion hole 122 into which a rotation shaft (not shown) is inserted.
Although not shown in FIG. 2, the rotor 120 has a caulking pin insertion hole 123 and a passage hole 124. The caulking pin insertion hole 123 is formed at a position intersecting the q axis, and caulking pins for integrating a plurality of laminated electromagnetic steel plates are inserted. The passage holes 124 are formed on both sides in the circumferential direction across the d axis, and a refrigerant used in the compressor, a cooling medium (for example, air) for cooling the stator 110 and the rotor 120, and the like flow along the axial direction. The shape, number, arrangement position, and the like of the caulking pin insertion hole 123 and the passage hole 124 can be changed as appropriate.

In the present embodiment, the magnet insertion portion 130 includes linear first to third inner walls 130a to 130c and first to third outer walls 130d to 130f extending in parallel, and a first linear outer peripheral wall 130g. The second outer peripheral wall 130i, the linear first end wall 130h, and the second end wall 130j are formed by one magnet insertion hole. Hereinafter, it is referred to as “magnet insertion hole 130”. The magnet insertion hole 130 has a central portion (a portion corresponding to the d-axis) along the circumferential direction protruding from the both end portions (the end portion on the q-axis side) to the outer peripheral side of the rotor 120 (hereinafter referred to as “in the outer peripheral side”). It has a trapezoidal shape (having a trapezoidal cross section). That is, an upper base of a trapezoidal shape is formed by the linear first inner wall 130a and the first outer wall 130d extending in parallel, and the linear second inner wall 130b and the second outer wall 130e extending in parallel. The first outer peripheral wall 130g and the first end wall 130h form one side of a trapezoidal shape, and the third inner wall 143c, the third outer wall 143f, and the second outer peripheral wall 130i that extend in parallel are formed. The second side wall 130j forms the other side of the trapezoidal shape.
The first end wall 130h on one side of the magnet insertion hole 130 along the circumferential direction is parallel to the second end wall 130j on the other side of the magnet insertion hole 130 of the adjacent main magnetic pole portion along the circumferential direction. It extends to.

The permanent magnet 140 includes first to third permanent magnet pieces 141 to 143 that are inserted into the magnet insertion hole 130. The first to third permanent magnet pieces 141 to 143 include linear inner walls 141a to 143a and outer walls 141b to 143b extending in parallel, linear first end walls 141c to 143c extending in parallel and first. It has a quadrangular cross section formed by two end walls 141d to 143d.
The permanent magnet 140 is arranged in a trapezoidal shape protruding to the outer peripheral side. That is, the first permanent magnet piece 141 is arranged along the upper base of the trapezoidal shape, the second permanent magnet piece 142 is arranged along the side of one side of the trapezoidal shape, and the third permanent magnet piece 143 is arranged. Are arranged along the other side of the trapezoidal shape.

Outer peripheral walls at both ends along the circumferential direction of the magnet insertion hole 130 (the first outer peripheral wall 130g on the one side and the second outer peripheral wall 130i on the other side along the circumferential direction), the outer peripheral surface 121 of the rotor 120, That is, the end walls at both ends along the circumferential direction of the permanent magnet 140 (the second end wall 142d on the one side along the circumferential direction of the second permanent magnet piece 142 and the third permanent magnet piece). A first bridge portion 160a and a second bridge portion 160b are formed between the second end wall 143d on the other side in the circumferential direction 143 and the outer peripheral surface 121 of the rotor 120. .
The strength against the centrifugal force of the rotor 120 is increased by the first bridge portion 160a and the second bridge portion 160b.
Further, both end portions of the magnet insertion hole 130 along the circumferential direction, that is, end walls of the permanent magnet 140 at both ends along the circumferential direction (the second end wall 142d and the third end wall of the second permanent magnet piece 142). Between the second end wall 143d) of the permanent magnet piece 143 and the end walls (first end wall 130h and second end wall 130j) at both ends of the magnet insertion hole 130 along the circumferential direction. A first space 150a and a second space 150b are formed.
The first space 150a and the second space 150b allow the magnetic flux generated from the permanent magnet 140 to be generated at both ends along the circumferential direction of the permanent magnet 140 (hereinafter referred to as “the both ends of the permanent magnet 140”). A short circuit can be prevented.

Further, the outer peripheral surface 121 of the rotor 120 intersects the first outer peripheral portion 121a that intersects the d axis of the main magnetic pole portions [A] to [D] and the q axis of the auxiliary magnetic pole portions [AB] to [DA]. The second outer peripheral portions 121b to be connected are alternately connected. The first outer peripheral portion 121a and the second outer peripheral portion 121b are connected by connection portions 120A and 120B.
The first outer peripheral portion 121a is formed in an arc shape having a radius R1 (projecting toward the outer peripheral side) with the rotation center O on the d axis as a center point. The second outer peripheral portion 121b is on the q axis and has a point P away from the rotation center O on the side opposite to the second outer peripheral portion 121b as a center point, and the arc shape of the first curved portion 121a. It is formed in a circular arc shape having a radius R2 larger than the radius R1 (projecting outwardly). In other words, the gap (air gap) between the inner peripheral surface (tooth tip surface 113) of the stator 110 and the outer peripheral surface 121 of the rotor 120 is such that the gap G2 along the q axis is larger than the gap G1 along the d axis. It is set to be large.
The outer peripheral surface 121 of the rotor 120 is alternately formed with a first outer peripheral portion 121a formed in an arc shape with a radius R1 and a second outer peripheral portion 121b formed in an arc shape with a radius R2 (radius R2> radius R1). By connecting and configuring, it is possible to reduce the change in the amount of magnetic flux in the connecting portions 120A and 120B between the first outer peripheral portion 121a and the second outer peripheral portion 121b, and to induce the induced voltage in the stator winding The harmonic component contained in the waveform (electromotive force waveform) can be reduced. As a result, when using a sensorless control type control device that detects the position of the rotor based on the electromotive force waveform without using the rotor position detection sensor, the efficiency decreases due to a decrease in the position detection accuracy of the rotor. Can be prevented.

In the first embodiment, the magnet insertion portion is formed in a protruding shape (permanent magnets are arranged in a protruding shape). Thereby, a magnet surface area increases and the amount of magnetic flux (effective magnetic flux amount) increases. And since the electric current which flows into a stator winding | coil can be made small by the amount of magnetic flux increasing, copper loss can be reduced.
Further, the magnet insertion portion is formed in a protruding shape protruding to the outer peripheral side (the permanent magnet is arranged in a protruding shape protruding to the outer peripheral side). Thereby, the space | interval between the both ends along the circumferential direction of a permanent magnet and the outer peripheral surface of a rotor becomes small, and between the both ends of the said permanent magnet along the circumferential direction and the outer peripheral surface of a rotor. The reluctance torque generated by the magnetic flux passing through is reduced. By reducing the reluctance torque, the iron loss is reduced. On the other hand, since the distance between the permanent magnet and the outer peripheral surface of the rotor is reduced, the decrease in the amount of magnetic flux due to the armature reaction is greatly suppressed. Thereby, while being able to reduce an iron loss, the amount of magnetic flux (effective magnetic flux amount) can be increased and efficiency improves.
In particular, in the first embodiment, the magnet insertion portion is formed in a trapezoidal shape (permanent magnets are arranged in a trapezoidal shape). Thereby, the space | interval between the center part (linear part corresponding to the trapezoid upper base) of the permanent magnet along the circumferential direction and the outer peripheral surface of a rotor can be made small. Accordingly, it is possible to further suppress a decrease in the effective magnetic flux amount due to the armature reaction.
Further, the outer peripheral surface of the rotor alternates between a first outer peripheral portion having an arc shape (radius R1) intersecting with the d axis and a second outer peripheral portion having an arc shape intersecting with the q axis (radius R2> radius R1). Connected to and configured. That is, the outer peripheral surface of the rotor is formed such that the gap G2 along the q axis is larger than the gap G1 along the d axis. As a result, the magnetic flux generated from both ends of the permanent magnet easily flows to the first outer peripheral portion side where the gap interval is small (it becomes difficult to flow to the second outer peripheral portion side where the gap interval is large), and the main magnetic pole portion The amount of magnetic flux increases. Further, the magnetic flux generated by passing a current through the stator windings easily flows to the first outer peripheral portion where the gap interval is small (it becomes difficult to flow to the second outer peripheral portion where the gap interval is large), and the permanent magnet Can be prevented from demagnetizing due to magnetic flux concentration. In addition, since the harmonic component contained in the electromotive force waveform can be reduced, a control device (control based on the position of the rotor detected using the electromotive force waveform of the stator winding) of the sensorless control method is provided. When used, it is possible to prevent a decrease in efficiency due to a decrease in rotor position detection accuracy.
Therefore, the efficiency of the permanent magnet motor can be improved.

A second embodiment of the permanent magnet motor of the present invention is shown in FIG. FIG. 3 is a partially enlarged view of the permanent magnet motor of the second embodiment. The permanent magnet motor of the second embodiment is different from the permanent magnet motor of the first embodiment in the configuration of the magnet insertion part 170 and the permanent magnet 180.
Therefore, below, the structure of the magnet insertion part 170 and the permanent magnet 180 of the permanent magnet electric motor of 2nd Embodiment is demonstrated. In FIG. 3, regarding the constituent elements other than the magnet insertion portion 170 and the permanent magnet 180, constituent elements having the same reference numerals as those shown in FIG. 2 are the same constituent elements.

The magnet insertion portion 170 includes arc-shaped inner walls 170a and outer walls 170b extending in parallel, linear first outer peripheral walls 170c and second outer peripheral walls 170e, linear first end walls 170d and second. It is composed of one magnet insertion hole formed by the end wall 170f. Hereinafter, it is referred to as “magnet insertion hole 170”.
The magnet insertion hole 170 is formed in an arc shape protruding to the outer peripheral side (having an arc-shaped cross section).
The permanent magnet 180 includes first to third permanent magnet pieces 181 to 183 inserted into the magnet insertion hole 170. The first to third permanent magnet pieces 181 to 183 include arc-shaped inner walls 181a to 183a and outer walls 181b to 183b extending in parallel, first end walls 181c to 183c extending linearly, and second It has an arc-shaped cross section formed by the end walls 181d to 183d.
The permanent magnet 180 is arranged in an arc shape protruding to the outer peripheral side. That is, the inner walls 181a to 183a and the outer walls 181b to 183b of the first to third permanent magnet pieces 181 to 183 are arranged along arcs centered on a predetermined center point.

In the present embodiment, the first and second bridge portions 160a and 160b are formed as in the first embodiment.
Further, the outer peripheral surface 121 of the rotor 120 is formed in a first outer peripheral portion 121a formed in an arc shape (radius R1) intersecting with the d axis and an arc shape (radius R2> radius R1) intersecting with the q axis. The second outer peripheral portions 121b thus formed are alternately connected.

In 2nd Embodiment, the magnet insertion part is formed in the protrusion shape which protruded on the outer peripheral side (it arrange | positions at the protrusion shape which the permanent magnet protruded on the outer peripheral side). Thereby, a magnet surface area increases and the amount of magnetic flux increases. Further, although the reluctance torque is reduced, the iron loss accompanying the generation of the reluctance torque can be reduced, and the decrease in the magnetic flux amount due to the armature reaction can be suppressed.
In particular, in the second embodiment, the magnet insertion portion is formed in an arc shape (permanent magnets are arranged in an arc shape). Thereby, the space | interval between the center part (part which cross | intersects d axis | shaft) along the circumferential direction of a permanent magnet and the outer peripheral surface of a rotor can be made small. Accordingly, it is possible to further suppress a decrease in the effective magnetic flux amount due to the armature reaction. Furthermore, the magnetic flux generated from the permanent magnet changes smoothly along the circumferential direction. Thereby, the harmonic component contained in an electromotive force waveform can be reduced more, and the iron loss resulting from the harmonic component contained in an electromotive force waveform can be reduced more.
Further, the outer peripheral surface of the rotor alternately connects the first outer peripheral portion formed in an arc shape (radius R1) and the second outer peripheral portion formed in an arc shape (radius R2> radius R1). It is configured.
Therefore, the efficiency of the permanent magnet motor can be improved.

A third embodiment of the permanent magnet motor of the present invention is shown in FIGS. FIG. 4 is a cross-sectional view of the permanent magnet motor 200 according to the third embodiment viewed from a direction perpendicular to the axial direction, and FIG. 5 is a partially enlarged view of FIG.
The permanent magnet motor 200 of the third embodiment is different from the permanent magnet motor 100 of the first embodiment in the configuration of the magnet insertion portion 230 and the permanent magnet 240. Therefore, below, the structure of the magnet insertion part 230 and the permanent magnet 240 is demonstrated. 4 and 5, components other than the magnet insertion portion 230 and the permanent magnet 240 are denoted by the same reference numerals as those shown in FIGS. 1 and 2 except for the numbers in the hundreds. The components that are present are the same components.

The magnet insertion part 230 is comprised by the 1st-3rd magnet insertion holes 231-233 arrange | positioned along the circumferential direction. The first magnet insertion hole 231 is a straight line formed by a linear inner wall 231a and an outer wall 231b extending in parallel, and a linear first end wall 231c and a second end wall 231d extending in parallel. Has a cross section. The second magnet insertion hole 232 and the third magnet insertion hole 233 include linear inner walls 232a and 233a and outer walls 232b and 233b extending in parallel, linear outer peripheral walls 232d and 233d, and a linear first wall. It has a straight cross section formed by the end walls 232c and 233c and the second end walls 232e and 233e.
The first end wall 231c on the one side along the circumferential direction and the second end wall 231d on the other side of the first magnet insertion hole 231 along the circumferential direction of the second magnet insertion hole 232, respectively. The first end wall 232c on the other side and the third magnet insertion hole 233 extend in parallel with the first end wall 233c on the one side along the circumferential direction. The second end wall 232e on the one side along the circumferential direction of the second magnet insertion hole 232 is arranged on the other side along the circumferential direction of the third magnet insertion hole 233 of the adjacent main magnetic pole part. It extends in parallel with the second end wall 233e.
The magnet insertion part 230 is formed in a trapezoidal shape protruding to the outer peripheral side. That is, the first magnet insertion hole 231 is formed along the upper base of the trapezoidal shape, the second magnet insertion hole 232 is formed along one side of the trapezoidal shape, and the third magnet insertion hole 233 is formed. Is formed along the other side of the trapezoidal shape.

The permanent magnet 240 includes first to third permanent magnet pieces 241 to 243 inserted into the first to third magnet insertion holes 231 to 233. As in the first embodiment, the first to third permanent magnet pieces 241 to 243 include inner walls 241a to 243a, outer walls 241b to 243b, first end walls 241c to 243c, and second end walls 241d to 243d. It has a quadrangular cross section formed by
The permanent magnet 240 is arranged in a trapezoidal shape protruding to the outer peripheral side. That is, the first permanent magnet piece 241 is arranged along the upper base of the trapezoidal shape, the second permanent magnet piece 242 is arranged along one side of the trapezoidal shape, and the third permanent magnet piece 243 is arranged. Are arranged along the other side of the trapezoidal shape.

The outer peripheral wall (the outer peripheral wall 232d of the second magnet insertion hole 232 and the outer peripheral wall 233d of the third magnet insertion hole 233) at both ends along the circumferential direction of the magnet insertion portion 230 and the outer peripheral surface 221 of the rotor 220 In other words, both end walls of the permanent magnet 240 (the second end wall 242d of the second permanent magnet piece 242 and the second end wall 243d of the third permanent magnet piece 243) and the outer peripheral surface 221 of the rotor 220 A first bridge portion 260a and a second bridge portion 260b are formed between the two. Further, between the first magnet insertion hole 231 and the second magnet insertion hole 232 and the third magnet insertion hole 233, that is, the first permanent magnet piece 241, the second permanent magnet piece 242 and the third magnet insertion hole 233. Between the permanent magnet piece 243, a third bridge portion 260c and a fourth bridge portion 260d are formed. The third and fourth bridge portions 260c and 260d further increase the strength of the rotor 220 against the centrifugal force.
Further, both end portions of the magnet insertion portion 230 (one end portion of the second magnet insertion hole 232 along the circumferential direction and the other end portion of the third magnet insertion hole 233 along the circumferential direction). That is, both end walls of the permanent magnet 240 (second end wall 242d of the second permanent magnet piece 242 and second end wall 243d of the third permanent magnet piece 243) and both end walls of the magnet insertion portion 230 (first The first space 250a and the second space 250b are formed between the second end wall 232e of the first magnet insertion hole 232 and the second end wall 233e of the third magnet insertion hole 233). ing. The first space 250a and the second space 250b prevent magnetic flux from being short-circuited at both ends of the permanent magnet 240.
Similarly to the first embodiment, the outer peripheral surface 221 of the rotor 220 has a first outer peripheral portion 221a formed in an arc shape (radius R1) intersecting with the d axis, and an arc shape intersecting with the q axis. The second outer peripheral portions 221b formed with (radius R2> radius R1) are alternately connected.

In 3rd Embodiment, the magnet insertion part is formed in the protrusion shape which protruded on the outer peripheral side (it arrange | positions at the protrusion shape which the permanent magnet protruded on the outer peripheral side). Thereby, a magnet surface area increases and the amount of magnetic flux increases. Further, although the reluctance torque is reduced, the iron loss accompanying the generation of the reluctance torque can be reduced, and the decrease in the magnetic flux amount due to the armature reaction can be suppressed.
In particular, in the third embodiment, the magnet insertion portion is formed in a trapezoidal shape (permanent magnets are arranged in a trapezoidal shape). Thereby, similarly to the first embodiment, the interval between the central portion of the permanent magnet along the circumferential direction and the outer peripheral surface of the rotor can be reduced, and the effective magnetic flux amount due to the armature reaction can be reduced. The decrease can be further suppressed.
Moreover, in 3rd Embodiment, the magnet insertion part is comprised by the several magnet insertion hole arrange | positioned along the circumferential direction via the bridge part (a permanent magnet is circumferential direction via a bridge part). Are constituted by a plurality of permanent magnet pieces arranged along the same line). Thereby, the intensity | strength with respect to the centrifugal force of the rotor is raised.
Further, the outer peripheral surface of the rotor has a first outer peripheral portion formed in an arc shape (radius R1) intersecting with the d axis, and an arc shape intersecting with the q axis (radius R2> radius R1). The two outer peripheral portions are alternately connected.
Therefore, the efficiency of the permanent magnet motor can be improved.

FIG. 6 shows a fourth embodiment of the permanent magnet motor of the present invention. FIG. 6 is a partially enlarged view of the permanent magnet motor of the fourth embodiment. The permanent magnet motor of the fourth embodiment is different from the permanent magnet motor of the third embodiment in the configuration of the magnet insertion part 270 and the permanent magnet 280.
Therefore, below, the structure of the magnet insertion part 270 and the permanent magnet 280 of the permanent magnet electric motor of 4th Embodiment is demonstrated. In FIG. 6, regarding the constituent elements other than the magnet insertion portion 270 and the permanent magnet 280, constituent elements having the same reference numerals as those shown in FIG. 5 are the same constituent elements.

The magnet insertion part 270 is comprised by the 1st-3rd magnet insertion holes 271-273 arrange | positioned along the circumferential direction. The first magnet insertion hole 271 has an arc-shaped cross section formed by an arc-shaped inner wall 271a and an outer wall 271b extending in parallel, a linear first end wall 271c, and a second end wall 271d. ing. The second and third magnet insertion holes 272 and 273 have arc-shaped inner walls 272a and 273a and outer walls 272b and 273b extending in parallel, linear outer peripheral walls 272d and 273d, and a linear first end wall 272c. And 273c and second end walls 272e and 273e have an arcuate cross section.
The magnet insertion part 270 is formed in an arc shape protruding to the outer peripheral side. That is, the inner walls 271a to 273a and the outer walls 271b to 273b of the first to third magnet insertion holes 271 to 273 are respectively arranged along arcs having a predetermined point as a center point.
The first end wall 271c and the second end wall 271d of the first magnet insertion hole 271 are the first end wall 272c of the second magnet insertion hole 272 and the first end wall 273d of the third magnet insertion hole 273, respectively. It extends in parallel with the end wall 273c. Further, the second end wall 272e of the second magnet insertion hole 272 extends in parallel with the second end wall 273e of the third magnet insertion hole 273 of the adjacent main magnetic pole part.

The permanent magnet 280 includes first to third permanent magnet pieces 281 to 283 that are inserted into the first to third magnet insertion holes 271 to 273. The first to third permanent magnet pieces 281 to 283 include arc-shaped inner walls 281a to 283a and outer walls 281b to 283b, linear first end walls 281c to 283c, and second end walls 281d extending in parallel. It has an arc-shaped cross section formed by ˜283d.
The permanent magnet 280 is arranged in an arc shape protruding to the outer peripheral side. That is, the inner walls 281a to 283a and the outer walls 281b to 283b of the first to third permanent magnet pieces 281 to 283 are arranged along arcs having a predetermined point as a center point.
In the present embodiment, as in the third embodiment, first to fourth bridge portions 260a to 260d and first and second space portions 250a and 250b are formed.

In 4th Embodiment, the magnet insertion part is formed in the protrusion shape which protruded on the outer peripheral side (it arrange | positions at the protrusion shape which the permanent magnet protruded on the outer peripheral side). Thereby, a magnet surface area increases and the amount of magnetic flux increases. Further, although the reluctance torque is reduced, the iron loss accompanying the generation of the reluctance torque can be reduced, and the decrease in the magnetic flux amount due to the armature reaction can be suppressed.
In particular, in the fourth embodiment, the magnet insertion portion is formed in an arc shape (permanent magnets are arranged in an arc shape). As a result, similarly to the second embodiment, it is possible to further suppress the decrease in the effective magnetic flux amount due to the armature reaction, and to further reduce the harmonic components included in the electromotive force waveform.
Further, similarly to the third embodiment, the magnet insertion portion is configured by a plurality of magnet insertion holes arranged along the circumferential direction via the bridge portion (the permanent magnet is interposed via the bridge portion). By being composed of a plurality of permanent magnet pieces arranged along the circumferential direction), the strength of the rotor against centrifugal force is increased.
Further, the outer peripheral surface of the rotor has a first outer peripheral portion formed in an arc shape (radius R1) intersecting with the d axis, and an arc shape intersecting with the q axis (radius R2> radius R1). The two outer peripheral portions are alternately connected.
Therefore, the efficiency of the permanent magnet motor can be improved.

A fifth embodiment of the permanent magnet motor of the present invention is shown in FIGS. FIG. 7 is a cross-sectional view of the permanent magnet motor 300 of the fifth embodiment viewed from a direction perpendicular to the axial direction, and FIG. 8 is a partially enlarged view of FIG.
The permanent magnet motor 300 of the fifth embodiment is different from the permanent magnet motor 100 of the first embodiment in the configuration of the magnet insertion portion 330 and the permanent magnet 340. Therefore, below, the structure of the magnet insertion part 330 and the permanent magnet 340 of the permanent magnet electric motor 300 of 5th Embodiment is demonstrated. 7 and 8, components other than the magnet insertion portion 330 and the permanent magnet 340 are denoted by the same reference numerals as those shown in FIGS. 1 and 2 except for the numbers in the hundreds. The components that are present are the same components.

The magnet insertion part 330 includes linear first to third inner walls 330a to 330c and first to third outer walls 330d to 330f, a linear first outer peripheral wall 330g and a second outer periphery extending in parallel. The wall 330i, the linear first end wall 330h, the second end wall 330j, the first protrusion 330x, and the second protrusion 330y are formed by one magnet insertion hole. Hereinafter, it is referred to as “magnet insertion hole 330”.
The magnet insertion hole 330 is formed in a trapezoidal shape protruding to the outer peripheral side (having a trapezoidal cross section). That is, a trapezoidal upper base is formed by the first inner wall 330a and the first outer wall 330d extending in parallel, and the second inner wall 330b, the second outer wall 330e, and the first outer peripheral wall extending in parallel are formed. 330g, the 1st end wall 330h, and the 1st protrusion part 330x form the side of one side of trapezoid shape, and the 3rd inner wall 330c, the 3rd outer wall 330f, and 2nd outer peripheral wall which are extended in parallel The other side of the trapezoidal shape is formed by 330i, the second end wall 330j, and the second protrusion 330y.
The first protrusion 330x and the second protrusion 330y protrude from the second inner wall 330b and the third inner wall 330c into the magnet insertion hole. The first protrusion 330x and the second protrusion 330y may be formed so as to protrude into the magnet insertion hole from the second outer wall 330e and the third outer wall 330f.

  As in the first embodiment, the permanent magnet 340 is configured by first to third permanent magnet pieces 341 to 343 having a quadrangular cross section, and is arranged in a trapezoidal shape protruding to the outer peripheral side. That is, the first permanent magnet piece 341 is arranged along the upper base of the trapezoidal shape, the second permanent magnet piece 342 is arranged along the side of one side of the trapezoidal shape, and the third permanent magnet The piece 343 is disposed along the other side of the trapezoidal shape.

Similarly to the first embodiment, a first bridge portion 360a and a second bridge portion 360b for increasing the strength of the rotor 320 are formed, and a first for preventing a short circuit of the magnetic flux. The space portion 350a and the second space portion 350b are formed.
In the present embodiment, the position of the permanent magnet 340 (the second permanent magnet piece 342 disposed at one end along the circumferential direction and the circumferential direction is formed by the first projection 330x and the second projection 330y. The position of the third permanent magnet piece 343 arranged at the other end can be set. Thus, both ends of the magnet insertion hole 330 (the second end wall 342d of the second permanent magnet piece 342 and the second end of the third permanent magnet piece 343 can be obtained without greatly changing the shape of the magnet insertion hole 330. The length along the circumferential direction of the first space 350a and the second space 350b formed between the end wall 343d and the first end wall 330h and the second end wall 330j of the magnet insertion hole 330). Can be easily changed. Therefore, the short circuit of the magnetic flux in the both ends of the permanent magnet 340 can be reliably prevented.
In the present embodiment, the first protrusion 330x and the second protrusion 330y correspond to the “positioning part” of the present invention.

  Similarly to the first embodiment, the outer peripheral surface 321 of the rotor 320 has a first outer peripheral portion 321a formed in an arc shape (radius R1) intersecting with the d axis, and an arc shape intersecting with the q axis. The second outer peripheral portions 321b formed with (radius R2> radius R1) are alternately connected.

In 5th Embodiment, the magnet insertion part is formed in the protrusion shape which protruded to the outer peripheral side (it arrange | positions at the protrusion shape which the permanent magnet protruded to the outer peripheral side). Thereby, a magnet surface area increases and the amount of magnetic flux increases. Further, although the reluctance torque is reduced, the iron loss accompanying the generation of the reluctance torque can be reduced, and the decrease in the magnetic flux amount due to the armature reaction can be suppressed.
In particular, in the fifth embodiment, the magnet insertion portion is formed in a trapezoidal shape (permanent magnets are arranged in a trapezoidal shape). Thereby, similarly to the first embodiment, the interval between the central portion of the permanent magnet along the circumferential direction and the outer peripheral surface of the rotor can be reduced, and the effective magnetic flux amount due to the armature reaction can be reduced. The decrease can be further suppressed.
Moreover, the magnet insertion part is provided with a positioning part for positioning the permanent magnet. Thereby, the 1st space part and 2nd space part for preventing the magnetic flux short circuit in the both ends of a permanent magnet can be changed easily.
Further, the outer peripheral surface of the rotor has a first outer peripheral portion formed in an arc shape (radius R1) intersecting with the d axis, and an arc shape intersecting with the q axis (radius R2> radius R1). The two outer peripheral portions are alternately connected.
Therefore, the efficiency of the permanent magnet motor can be improved.

A sixth embodiment of the permanent magnet motor of the present invention is shown in FIG. FIG. 9 is a partially enlarged view of the permanent magnet motor of the sixth embodiment. The permanent magnet motor of the sixth embodiment is different from the permanent magnet motor of the fifth embodiment in the configuration of the magnet insertion part 370 and the permanent magnet 380.
Therefore, below, the structure of the magnet insertion part 370 and the permanent magnet 380 of the permanent magnet electric motor of 6th Embodiment is demonstrated. In FIG. 9, regarding the constituent elements other than the magnet insertion portion 370 and the permanent magnet 380, constituent elements having the same reference numerals as those shown in FIG. 8 are the same constituent elements.

The magnet insertion portion 370 includes arc-shaped inner walls 370a and outer walls 370b extending in parallel, a linear first outer peripheral wall 370c and a second outer peripheral wall 370e, a linear first end wall 370d and a second outer wall 370d. It is comprised by one magnet insertion hole formed of the end wall 370f, the 1st protrusion 370x, and the 2nd protrusion 370y. Hereinafter, it is referred to as “magnet insertion hole 370”. The magnet insertion hole 370 is formed in an arc shape protruding to the outer peripheral side (having an arc-shaped cross section).
The permanent magnet 380 includes first to third permanent magnet pieces 381 to 383 inserted into the magnet insertion hole 370. The first to third permanent magnet pieces 381 to 383 include arc-shaped inner walls 381a to 383a and outer walls 381b to 383b extending in parallel, first linear end walls 381c to 383c, and second end walls 381d. It has an arc-shaped cross section formed by ˜383d. The permanent magnet 380 is arranged in a circular arc shape protruding to the outer peripheral side.
In the present embodiment, as in the fifth embodiment, first and second bridge portions 360a and 360b and first and second space portions 350a and 350b are formed. The outer peripheral surface 321 of the rotor 320 is configured by alternately connecting the first outer peripheral portion 321a and the second outer peripheral portion 321b. Further, the position of the permanent magnet 380 (first to third permanent magnet pieces 381 to 383) can be set by the first protrusion 370x and the second protrusion 370y.

In 6th Embodiment, the magnet insertion part is formed in the protrusion shape which protruded to the outer peripheral side (it arrange | positions at the protrusion shape which the permanent magnet protruded to the outer peripheral side). Thereby, a magnet surface area increases and the amount of magnetic flux increases. Further, although the reluctance torque is reduced, the iron loss accompanying the generation of the reluctance torque can be reduced, and the decrease in the magnetic flux amount due to the armature reaction can be suppressed.
In particular, in the sixth embodiment, the magnet insertion portion is formed in an arc shape (permanent magnets are arranged in an arc shape). As a result, similarly to the second embodiment, it is possible to further suppress the decrease in the effective magnetic flux amount due to the armature reaction, and to further reduce the harmonic components included in the electromotive force waveform.
Moreover, since the positioning part which positions a permanent magnet is provided, the 1st space part and 2nd space part for preventing the magnetic flux short circuit in the both ends of a permanent magnet can be changed easily.
Further, the outer peripheral surface of the rotor has a first outer peripheral portion formed in an arc shape (radius R1) intersecting with the d axis, and an arc shape intersecting with the q axis (radius R2> radius R1). The two outer peripheral portions are alternately connected.
Therefore, the efficiency of the permanent magnet motor can be improved.

A seventh embodiment of the permanent magnet motor of the present invention is shown in FIGS. FIG. 10 is a cross-sectional view of the permanent magnet motor 400 according to the seventh embodiment viewed from a direction perpendicular to the axial direction, and FIG. 11 is a partially enlarged view of FIG.
The permanent magnet motor 400 of the seventh embodiment is different from the permanent magnet motor 200 of the third embodiment in the configuration of the magnet insertion part 430 and the permanent magnet 440. Therefore, below, the structure of the magnet insertion part 430 and the permanent magnet 440 is demonstrated. 10 and 11, components other than the magnet insertion portion 430 and the permanent magnet 440 are denoted by the same reference numerals as those shown in FIGS. 4 and 5 except for the numbers in the hundreds. The components that are present are the same components.

The magnet insertion part 430 is comprised by the 1st-3rd magnet insertion holes 431-433 arrange | positioned along the circumferential direction. The first magnet insertion hole 431 is a linear shape formed by linear inner walls 431a and outer walls 431b extending in parallel, and linear first end walls 431c and second end walls 431d extending in parallel. Has a cross section. The second magnet insertion hole 432 and the third magnet insertion hole 433 include linear inner walls 432a and 433a and outer walls 432b and 433b extending in parallel, linear outer peripheral walls 432d and 433d, and linear first walls. It has a linear cross section formed by the end walls 432c and 433c, the linear second end walls 432e and 433e, the first protrusion 432x, and the second protrusion 430y.
The first end wall 431c and the second end wall 431d of the first magnet insertion hole 431 are respectively the second end wall 432c of the second magnet insertion hole 432 and the second end wall 433 of the third magnet insertion hole 433. It extends in parallel with the end wall 433c. In addition, the second end wall 432e of the second magnet insertion hole 432 extends in parallel with the second end wall 433e of the third magnet insertion hole 433 of the adjacent main magnetic pole portion, and the third magnet insertion The second end wall 433e of the hole 433 extends in parallel with the second end wall 432e of the second magnet insertion hole 432 of the adjacent main magnetic pole portion.
The magnet insertion part 430 is formed in a trapezoidal shape protruding to the outer peripheral side, as in the third embodiment.

  The permanent magnet 440 includes first to third permanent magnet pieces 441 to 443 that are inserted into the first to third magnet insertion holes 431 to 433. The first to third permanent magnet pieces 441 to 443 are similar to the third embodiment in that the inner walls 441a to 443a, the outer walls 441b to 443b, the first end walls 441c to 443c, and the second end walls 441d to 443d. It has a quadrangular cross section formed by The permanent magnet 440 is arranged in a trapezoidal shape protruding to the outer peripheral side, as in the third embodiment.

In the present embodiment, as in the third embodiment, the first to fourth bridge portions 460a to 460d for increasing the strength against the centrifugal force of the rotor 420 and the magnetic flux short circuit at both ends of the permanent magnet 440 are prevented. A first space portion 450a and a second space portion 450b are formed.
In the present embodiment, the position of the permanent magnet 440 (the second permanent magnet piece 442 disposed at one end along the circumferential direction and the circumferential direction is formed by the first projection 432x and the second projection 433y. The position of the third permanent magnet piece 443 disposed at the other end can be set. Thus, both end portions of the magnet insertion hole 430 (the second end wall 442d of the second permanent magnet piece 442 and the second end wall 443d of the third permanent magnet piece 443 and the second magnet insertion hole 432 first Second end wall 432e and the second end wall 433e of the third magnet insertion hole 433) in the circumferential direction of the first space 450a and the second space 450b. This can be easily changed, and a short circuit of magnetic flux at both ends of the permanent magnet 440 can be reliably prevented.

  Further, the outer peripheral surface 421 of the rotor 420 has a first outer peripheral portion 421a formed in an arc shape (radius R1) intersecting with the d axis and an arc shape intersecting with the q axis, as in the third embodiment. The second outer peripheral portions 421b formed with (radius R2> radius R1) are alternately connected.

In 7th Embodiment, the magnet insertion part is formed in the protrusion shape which protruded to the outer peripheral side (it arrange | positions at the protrusion shape which the permanent magnet protruded to the outer peripheral side). Thereby, a magnet surface area increases and the amount of magnetic flux increases. Further, although the reluctance torque is reduced, the iron loss accompanying the generation of the reluctance torque can be reduced, and the decrease in the magnetic flux amount due to the armature reaction can be suppressed.
In particular, in the seventh embodiment, the magnet insertion portion is formed in a trapezoidal shape (permanent magnets are arranged in a trapezoidal shape). Thereby, similarly to the first embodiment, the interval between the central portion of the permanent magnet along the circumferential direction and the outer peripheral surface of the rotor can be reduced, and the effective magnetic flux amount due to the armature reaction can be reduced. The decrease can be further suppressed.
Moreover, the magnet insertion part is comprised by the several magnet insertion hole arrange | positioned along the circumferential direction via the bridge part (The permanent magnet is arrange | positioned along the circumferential direction via the bridge part. By being composed of a plurality of permanent magnet pieces), the strength of the rotor against centrifugal force is increased.
Moreover, since the positioning part which positions a permanent magnet is provided, the 1st space part and 2nd space part for preventing the magnetic flux short circuit in the both ends of a permanent magnet can be changed easily.
Further, the outer peripheral surface of the rotor has a first outer peripheral portion formed in an arc shape (radius R1) intersecting with the d axis, and an arc shape intersecting with the q axis (radius R2> radius R1). The two outer peripheral portions are alternately connected.
Therefore, the efficiency of the permanent magnet motor can be improved.

FIG. 12 shows an eighth embodiment of the permanent magnet motor of the present invention. FIG. 12 is a partially enlarged view of the permanent magnet motor of the eighth embodiment. The permanent magnet motor of the eighth embodiment differs from the permanent magnet motor of the seventh embodiment in the configuration of the magnet insertion part 470 and the permanent magnet 480.
Therefore, hereinafter, the magnet insertion portion 470 and the permanent magnet 480 of the permanent magnet motor of the eighth embodiment will be described. In FIG. 12, regarding the constituent elements other than the magnet insertion portion 470 and the permanent magnet 480, constituent elements having the same reference numerals as those shown in FIG. 11 are the same constituent elements.

The magnet insertion portion 470 includes first to third magnet insertion holes 471 to 473 arranged along the circumferential direction. The first magnet insertion hole 471 has an arc-shaped cross section formed by an arc-shaped inner wall 471a and an outer wall 471b extending in parallel, a linear first end wall 471c, and a second end wall 471d. ing. The second and third magnet insertion holes 472 and 473 include arc-shaped inner walls 472a and 473a and outer walls 472b and 473b extending in parallel, linear outer peripheral walls 472d and 473d, and linear first end walls 472c. And 473c, linear second end walls 472e and 473e, a first protrusion 472x, and a second protrusion 473y. The magnet insertion part 470 is formed in a circular arc shape protruding to the outer peripheral side.
The permanent magnet 480 includes first to third permanent magnet pieces 481 to 483 that are inserted into the first to third magnet insertion holes 471 to 473. The first to third permanent magnet pieces 481 to 483 include arc-shaped inner walls 481a to 483a and outer walls 481b to 483b extending in parallel, first linear end walls 481c to 483c, and second end walls 481d. It has an arc-shaped cross section formed by ˜483d. The permanent magnet 480 is arranged in an arc shape protruding to the outer peripheral side.

  In the present embodiment, the position of the permanent magnet 480 (the second permanent magnet piece 482 disposed at one end along the circumferential direction and the circumferential direction is formed by the first projection 472x and the second projection 473y. The position of the third permanent magnet piece 483 disposed at the other end can be set. Thus, both end portions of the magnet insertion hole 470 (the second end wall 482d of the second permanent magnet piece 482, the second end wall 483d of the third permanent magnet piece 483, and the second magnet insertion hole 472 first). Second end wall 472e and the second end wall 472e of the third magnet insertion hole 473), the length along the circumferential direction of the first space portion 450a and the second space portion 450b. This can be easily changed, and short-circuiting of magnetic flux at both ends of the permanent magnet 480 can be reliably prevented.

  In the present embodiment, as in the seventh embodiment, the first to fourth bridge portions 460a to 460d, the first and second space portions 450a and 450b are formed, and the rotor 420 is The outer peripheral surface 421 includes a first outer peripheral portion 421a and a second outer peripheral portion 421b.

In the eighth embodiment, the magnet insertion portion is formed in a protruding shape that protrudes to the outer peripheral side (arranged in a protruding shape in which the permanent magnet protrudes to the outer peripheral side). Thereby, a magnet surface area increases and the amount of magnetic flux increases. Further, although the reluctance torque is reduced, the iron loss accompanying the generation of the reluctance torque can be reduced, and the decrease in the magnetic flux amount due to the armature reaction can be suppressed.
In particular, in the eighth embodiment, the magnet insertion portion is formed in an arc shape (permanent magnets are arranged in an arc shape). As a result, similarly to the second embodiment, it is possible to further suppress the decrease in the effective magnetic flux amount due to the armature reaction, and to further reduce the harmonic components included in the electromotive force waveform.
Moreover, the magnet insertion part is comprised by the several magnet insertion hole arrange | positioned along the circumferential direction via the bridge part (The permanent magnet is arrange | positioned along the circumferential direction via the bridge part. By being composed of a plurality of permanent magnet pieces), the strength of the rotor against centrifugal force is increased.
Moreover, since the positioning part which positions a permanent magnet is provided, the 1st space part and 2nd space part for preventing the magnetic flux short circuit in the both ends of a permanent magnet can be changed easily.
Further, the outer peripheral surface of the rotor alternates between a first outer peripheral portion having an arc shape (radius R1) intersecting with the d axis and a second outer peripheral portion having an arc shape intersecting with the q axis (radius R2> radius R1). Connected to and configured.
Therefore, the efficiency of the permanent magnet motor can be improved.

A ninth embodiment of the permanent magnet motor of the present invention is shown in FIGS. FIG. 13 is a cross-sectional view of the permanent magnet motor 500 according to the ninth embodiment viewed from a direction perpendicular to the axial direction, and FIG. 14 is a partially enlarged view of FIG.
The permanent magnet motor 500 of the ninth embodiment is different from the permanent magnet motor 100 of the first embodiment in the configuration of the magnet insertion portion 530 and the permanent magnet 540. Therefore, below, the structure of the magnet insertion part 530 and the permanent magnet 540 of the permanent magnet electric motor 500 of 9th Embodiment is demonstrated. 13 and 14, the constituent elements other than the magnet insertion portion 530 and the permanent magnet 540 are denoted by the same reference numerals as those shown in FIGS. 1 and 2 except for the numbers in the hundreds. The components that are present are the same components.

The magnet insertion portion 530 includes linear first inner walls 530a and second inner walls 530b, first outer walls 530c and second outer walls 530d, first outer peripheral walls 530e, and second outer peripheral walls extending in parallel. It is configured by one magnet insertion hole formed by 530g, the first end wall 530f, and the second end wall 530h. Hereinafter, it is referred to as “magnet insertion hole 530”.
The magnet insertion hole 530 is formed in a V shape protruding to the outer peripheral side (having a V-shaped cross section). That is, one side of the V shape is formed by the linear first inner wall 531a and the first outer wall 531b, the linear first outer peripheral wall 530e, and the first end wall 530f extending in parallel. A second inner wall 530b and a second outer wall 530d extending in parallel, a second outer peripheral wall 530g having a linear shape, and a second end wall 530h form a V-shaped side on the other side.

The permanent magnet 540 includes a first permanent magnet piece 541 and a second permanent magnet piece 542 that are inserted into the magnet insertion hole 530. The first permanent magnet piece 541 and the second permanent magnet piece 542 have inner walls 541a and 542a and outer walls 541b and 542b extending in parallel, and first end walls 541c and 542c and second end extending in parallel. It has a square cross section formed by the walls 541d and 542d.
The permanent magnet 540 is arranged in a V shape protruding to the outer peripheral side. That is, the first permanent magnet piece 541 is arranged along one side of the V shape, and the second permanent magnet piece 542 is arranged along the other side of the V shape.

In this embodiment, between the outer peripheral walls (first outer peripheral wall 530e and second outer peripheral wall 530g) at both ends along the circumferential direction of the magnet insertion hole 530 and the outer peripheral surface 521 of the rotor 520, that is, permanent. Both end walls of the magnet 540 along the circumferential direction (the second end wall 541d of the first permanent magnet piece 541 and the second end wall 542d of the second permanent magnet piece 542) and the outer peripheral surface 521 of the rotor 520. In between, the 1st bridge part 560a and the 2nd bridge part 560b for raising the intensity | strength with respect to the centrifugal force of the rotor 520 are formed.
Further, both end portions of the magnet insertion hole 530 along the circumferential direction, that is, both end walls of the permanent magnet 540 along the circumferential direction (the second end wall 541d and the second permanent wall of the first permanent magnet piece 541). Both ends of the permanent magnet 540 are disposed between the second end wall 542d of the magnet piece 542 and both end walls (first end wall 530f and second end wall 530h) along the circumferential direction of the magnet insertion hole 530. A first space portion 550a and a second space portion 550b for preventing a short circuit of magnetic flux in the portion are formed.

  In addition, the outer peripheral surface 521 of the rotor 520 has a first outer peripheral portion 521a formed in an arc shape (radius R1) intersecting with the d axis and an arc shape intersecting with the q axis, as in the first embodiment. The second outer peripheral portions 521b formed with (radius R2> radius R1) are alternately connected.

In the ninth embodiment, the magnet insertion portion is formed in a protruding shape protruding to the outer peripheral side (arranged in a protruding shape where the permanent magnet protrudes to the outer peripheral side). Thereby, a magnet surface area increases and the amount of magnetic flux increases. Further, although the reluctance torque is reduced, the iron loss accompanying the generation of the reluctance torque can be reduced, and the decrease in the magnetic flux amount due to the armature reaction can be suppressed.
In particular, in the ninth embodiment, the magnet insertion portion is formed in a V shape (permanent magnets are arranged in a V shape). Thereby, the center part of the permanent magnet along the circumferential direction (when permanent magnet pieces are arranged on both sides of the d-axis, the end wall on the d-axis side of each permanent magnet piece) and the outer periphery of the rotor The space between the surfaces can be reduced. Accordingly, it is possible to further suppress a decrease in the effective magnetic flux amount due to the armature reaction.
Further, the outer peripheral surface of the rotor has a first outer peripheral portion formed in an arc shape (radius R1) intersecting with the d axis, and an arc shape intersecting with the q axis (radius R2> radius R1). The two outer peripheral portions are alternately connected.
Therefore, the efficiency of the permanent magnet motor can be improved.

FIG. 15 shows a tenth embodiment of the permanent magnet motor of the present invention. FIG. 15 is a partially enlarged view of the permanent magnet motor of the tenth embodiment.
The permanent magnet motor of the tenth embodiment differs from the permanent magnet motor of the ninth embodiment in the configuration of the magnet insertion hole 570 and the permanent magnet 580.
Here, the tenth embodiment differs from the second embodiment only in the configuration of the permanent magnet 580. That is, in the second embodiment, the permanent magnet 170 is constituted by the first to third permanent magnet pieces 181 to 183 having an arc-shaped cross section, whereas in the tenth embodiment, the arc-shaped section is formed. A permanent magnet 580 is constituted by first and second permanent magnet pieces 581 and 582 having a cross section.
Therefore, the description of the tenth embodiment is omitted. Note that the tenth embodiment has the same effects as the second embodiment.
In FIG. 15, regarding the constituent elements other than the permanent magnet 580, constituent elements having the same reference numerals as those shown in FIG. 3 are the same constituent elements.

An eleventh embodiment of the permanent magnet motor of the present invention is shown in FIGS. 16 is a cross-sectional view of the permanent magnet motor 600 according to the eleventh embodiment as viewed from a direction perpendicular to the axial direction, and FIG. 17 is a partially enlarged view of FIG.
The permanent magnet motor 600 of the eleventh embodiment is different from the permanent magnet motor 500 of the ninth embodiment in the configuration of the magnet insertion portion 630 and the permanent magnet 640. Therefore, below, the structure of the magnet insertion part 630 and the permanent magnet 640 of the permanent magnet electric motor 600 of 11th Embodiment is demonstrated. 16 and 17, components other than the magnet insertion portion 630 and the permanent magnet 640 are denoted by the same reference numerals as those shown in FIGS. 13 and 14 except for the numbers in the hundreds. The components that are present are the same components.

The magnet insertion part 630 includes first and second magnet insertion holes 631 and 632 arranged along the circumferential direction. The first and second magnet insertion holes 631 and 632 include linear inner walls 631a and 632a and outer walls 631b and 632b extending in parallel, linear outer peripheral walls 631d and 632d, and linear first end walls 631c. And 632c, having a linear cross section formed by linear second end walls 631d and 632d.
The magnet insertion part 630 is formed in a V shape protruding to the outer peripheral side. That is, the first magnet insertion hole 631 forms one side of the V shape, and the second magnet insertion hole 632 forms the other side of the V shape.
The first end wall 631c on the other side along the circumferential direction of the first magnet insertion hole 631 and the first end wall 632c on the one side along the circumferential direction of the second magnet insertion hole 632 are parallel to each other. It extends to. Further, the second end wall 631e on the one side along the circumferential direction of the first magnet insertion hole 631 is formed on the other side along the circumferential direction of the second magnet insertion hole 632 of the adjacent main magnetic pole part. It extends in parallel with the second end wall 632e.

The permanent magnet 640 is constituted by first and second permanent magnet pieces 641 and 642 inserted into the first and second magnet insertion holes 631 and 632. The first and second permanent magnet pieces 641 and 642 include linear inner walls 641a and 642a and outer walls 641b and 642b extending in parallel, first linear end walls 641c and 642c extending in parallel, and first walls 641c and 642c. It has a square cross section formed by two end walls 641d and 642d.
The permanent magnet 640 is arranged in a V shape protruding to the outer peripheral side. That is, the first permanent magnet piece 641 is arranged along one side of the V shape, and the second permanent magnet piece 642 is arranged along the other side of the V shape.

In the present embodiment, the outer peripheral walls (the outer peripheral wall 631d of the first magnet insertion hole 631 and the outer peripheral wall 632d of the second magnet insertion hole 632) of both ends along the circumferential direction of the magnet insertion portion 630 and the rotor 620 are arranged. Both ends of the permanent magnet 640 along the circumferential direction between the outer peripheral surface 621 (the second end wall 641d of the first permanent magnet piece 641 and the second end wall of the second permanent magnet piece 642) 642d) and the outer peripheral surface 621 of the rotor 620, a first bridge portion 660a and a second bridge portion 660b are formed. A third bridge portion 660c is formed between the first magnet insertion hole 631 and the second magnet insertion hole 632 (between the first permanent magnet piece 641 and the second permanent magnet piece 642). Yes. The strength with respect to the centrifugal force of the rotor 620 is further enhanced by the third bridge portion 660c.
Further, both end portions of the magnet insertion portion 630 (one end portion along the circumferential direction of the first magnet insertion hole 631 and the other end portion along the circumferential direction of the second magnet insertion hole 632), that is, , Both end walls of the permanent magnet 640 (the second end wall 641d of the first permanent magnet piece 641 and the second end wall 642d of the second permanent magnet piece 642) and both end walls of the magnet insertion portion 630 (first The first magnetic flux is prevented from being short-circuited at both ends of the permanent magnet 640 between the second end wall 631e of the magnet insertion hole 631 and the second end wall 632e of the second magnet insertion hole 632). A space portion 650a and a second space portion 650b are formed.

  Further, the outer peripheral surface 621 of the rotor 620 is formed in a first outer peripheral portion 621a formed in an arc shape (radius R1) intersecting with the d axis and an arc shape (radius R2> radius R1) intersecting with the q axis. The second outer peripheral portions 621b are connected alternately.

In the eleventh embodiment, the magnet insertion portion is formed in a protruding shape protruding to the outer peripheral side (arranged in a protruding shape where the permanent magnet protrudes to the outer peripheral side). Thereby, a magnet surface area increases and the amount of magnetic flux increases. Further, although the reluctance torque is reduced, the iron loss accompanying the generation of the reluctance torque can be reduced, and the decrease in the magnetic flux amount due to the armature reaction can be suppressed.
In particular, in the eleventh embodiment, the magnet insertion portion is formed in a V shape (permanent magnets are arranged in a V shape). Thereby, the fall of the effective magnetic flux amount by armature reaction can be suppressed more similarly to 9th Embodiment.
Moreover, the magnet insertion part is comprised by the several magnet insertion hole arrange | positioned along the circumferential direction via the bridge part (The permanent magnet is arrange | positioned along the circumferential direction via the bridge part. By being composed of a plurality of permanent magnet pieces), the strength of the rotor against centrifugal force is increased.
Further, the outer peripheral surface of the rotor has a first outer peripheral portion formed in an arc shape (radius R1) intersecting with the d axis, and an arc shape intersecting with the q axis (radius R2> radius R1). The two outer peripheral portions are alternately connected.
Therefore, the efficiency of the permanent magnet motor can be improved.

A twelfth embodiment of the permanent magnet motor of the present invention is shown in FIG. FIG. 18 is a partially enlarged view of the permanent magnet motor of the twelfth embodiment. The permanent magnet motor of the twelfth embodiment differs from the permanent magnet motor of the eleventh embodiment in the configuration of the magnet insertion portion 670 and the permanent magnet 680.
Therefore, hereinafter, configurations of the magnet insertion portion 670 and the permanent magnet 680 of the permanent magnet electric motor according to the twelfth embodiment will be described. In FIG. 18, regarding the constituent elements other than the magnet insertion portion 670 and the permanent magnet 680, constituent elements denoted by the same reference numerals as those shown in FIG. 17 are the same constituent elements.

The magnet insertion part 670 is constituted by a first magnet insertion hole 671 and a second magnet insertion hole 672 arranged along the circumferential direction. The first magnet insertion hole 671 and the second magnet insertion hole 672 include arc-shaped inner walls 671a and 672a and outer walls 671b and 672b extending in parallel, linear outer peripheral walls 671d and 672d, and a linear first It has an arcuate cross section formed by the end walls 671c and 672c and the second end walls 671e and 672e. The magnet insertion part 670 is formed in an arc shape protruding to the outer peripheral side.
The permanent magnet 680 is configured by first and second permanent magnet pieces 681 and 682 inserted into the first and second magnet insertion holes 671 and 672. The first and second permanent magnet pieces 681 and 682 include arc-shaped inner walls 681a and 682a and outer walls 681b and 682b extending in parallel, linear first end walls 681c and 682c and second end wall 681d. And 682d. The permanent magnet 680 is arranged in an arc shape protruding to the outer peripheral side.
In the present embodiment, similarly to the eleventh embodiment, the first to third bridge portions 660a to 660c for increasing the strength against the centrifugal force of the rotor and the short circuit of the magnetic flux at both ends of the permanent magnet 680 are prevented. First and second space portions 650a and 650b are formed, and the outer peripheral surface 621 of the rotor 620 is composed of a first outer peripheral portion 621a and a second outer peripheral portion 621b.

In the twelfth embodiment, the magnet insertion portion is formed in a protruding shape that protrudes to the outer peripheral side (arranged in a protruding shape in which the permanent magnet protrudes to the outer peripheral side). Thereby, a magnet surface area increases and the amount of magnetic flux increases. Further, although the reluctance torque is reduced, the iron loss accompanying the generation of the reluctance torque can be reduced, and the decrease in the magnetic flux amount due to the armature reaction can be suppressed.
In particular, in the twelfth embodiment, the magnet insertion portion is formed in an arc shape (permanent magnets are arranged in an arc shape). As a result, similarly to the second embodiment, it is possible to further suppress the decrease in the effective magnetic flux amount due to the armature reaction, and to further reduce the harmonic components included in the electromotive force waveform.
Moreover, the magnet insertion part is comprised by the several magnet insertion hole arrange | positioned along the circumferential direction via the bridge part (The permanent magnet is arrange | positioned along the circumferential direction via the bridge part. By being composed of a plurality of permanent magnet pieces), the strength of the rotor against centrifugal force is increased.
Further, the outer peripheral surface of the rotor has a first outer peripheral portion formed in an arc shape (radius R1) intersecting with the d axis, and an arc shape intersecting with the q axis (radius R2> radius R1). The two outer peripheral portions are alternately connected.
Therefore, the efficiency of the permanent magnet motor can be improved.

A thirteenth embodiment of the permanent magnet motor of the present invention is shown in FIGS. FIG. 19 is a cross-sectional view of the permanent magnet motor 700 according to the thirteenth embodiment as viewed from a direction perpendicular to the axial direction, and FIG. 20 is a partially enlarged view of FIG.
The permanent magnet motor 700 of the thirteenth embodiment is different from the permanent magnet motor 500 of the ninth embodiment in the configuration of the magnet insertion part 730 and the permanent magnet 740. Therefore, below, the structure of the magnet insertion part 730 and the permanent magnet 740 of the permanent magnet electric motor 700 of 13th Embodiment is demonstrated. In FIG. 19 and FIG. 20, constituent elements other than the magnet insertion portion 730 and the permanent magnet 740 are denoted by the same reference numerals as those shown in FIG. 13 and FIG. The components that are present are the same components.

The magnet insertion portion 730 includes linear first inner walls 730a and second inner walls 730b and first outer walls 730c and second outer walls 730d extending in parallel, first linear outer peripheral walls 730e and second. The outer peripheral wall 730g, the linear first end wall 730f, the second end wall 730h, the first protrusion 730x, and the second protrusion 730y are formed by one magnet insertion hole. Hereinafter, it is referred to as “magnet insertion hole 730”. The magnet insertion hole 730 is formed in a V shape protruding to the outer peripheral side (having a V-shaped cross section).
The first protrusion 730x and the second protrusion 730y protrude from the first inner wall 730a and the second inner wall 730b into the magnet insertion hole. The first protrusion 730x and the second protrusion 730y may be formed to protrude from the first outer wall 730c and the second outer wall 730d into the magnet insertion hole.

As in the ninth embodiment, the permanent magnet 740 includes a first permanent magnet piece 741 and a second permanent magnet piece 742 having a quadrangular cross section, and is arranged in a V shape protruding to the outer peripheral side. Has been.
Similarly to the ninth embodiment, the first bridge portion 760a and the second bridge portion 760b for increasing the strength against the centrifugal force of the rotor 730 are formed, and at both end portions of the permanent magnet 740. A first space portion 750a and a second space portion 750b for preventing a short circuit of magnetic flux are formed.
In the present embodiment, the position of the permanent magnet 740 (the first permanent magnet piece 741 disposed on one side along the circumferential direction and the circumferential direction by the first projection 730x and the second projection 730y). The position of the second permanent magnet piece 742 disposed on the other side can be set. Thereby, it forms in the both ends of the magnet insertion hole 730, without changing the shape of the magnet insertion hole 730 largely (the 2nd end wall 741d of the 1st permanent magnet piece 741 and the 2nd permanent magnet piece 742). Circumferential direction of the first space portion 750a and the second space portion 750b (formed between the second end wall 742d of the first hole 730d and the first end wall 730f and the second end wall 730h of the magnet insertion hole 730). The length along can be easily changed. Therefore, a short circuit of magnetic flux at both ends of the permanent magnet 740 can be reliably prevented.
In addition, the outer peripheral surface 721 of the rotor 720 is formed in a first outer peripheral portion 721a formed in an arc shape (radius R1) intersecting with the d axis and an arc shape (radius R2> radius R1) intersecting with the q axis. The second outer peripheral portions 721b thus formed are alternately connected.

In the thirteenth embodiment, the magnet insertion portion is formed in a protruding shape that protrudes to the outer peripheral side (arranged in a protruding shape in which the permanent magnet protrudes to the outer peripheral side). Thereby, a magnet surface area increases and the amount of magnetic flux increases. Further, although the reluctance torque is reduced, the iron loss accompanying the generation of the reluctance torque can be reduced, and the decrease in the magnetic flux amount due to the armature reaction can be suppressed.
In particular, in the thirteenth embodiment, the magnet insertion portion is formed in a V shape (permanent magnets are arranged in a V shape). Thereby, the fall of the effective magnetic flux amount by armature reaction can be suppressed more similarly to 9th Embodiment.
Moreover, since the positioning part which positions a permanent magnet is provided in the magnet insertion part, the 1st space part and 2nd space part for preventing the magnetic flux short circuit in the both ends of a permanent magnet are changed easily. be able to.
Further, the outer peripheral surface of the rotor has a first outer peripheral portion formed in an arc shape (radius R1) intersecting with the d axis, and an arc shape intersecting with the q axis (radius R2> radius R1). The two outer peripheral portions are alternately connected.
Therefore, the efficiency of the permanent magnet motor can be improved.

A fourteenth embodiment of the permanent magnet motor of the present invention is shown in FIG. FIG. 21 is a partially enlarged view of the permanent magnet motor of the fourteenth embodiment. The permanent magnet motor of the fourteenth embodiment differs from the permanent magnet motor of the thirteenth embodiment in the configuration of the magnet insertion part 770 and the permanent magnet 780.
Therefore, hereinafter, the configurations of the magnet insertion portion 770 and the permanent magnet 780 of the permanent magnet motor of the fourteenth embodiment will be described. In FIG. 21, regarding the constituent elements other than the magnet insertion portion 770 and the permanent magnet 780, constituent elements denoted by the same reference numerals as those shown in FIG. 20 are the same constituent elements.

The magnet insertion portion 770 includes parallel arc-shaped inner walls 770a and outer walls 770b, linear first outer peripheral walls 770c and second outer peripheral walls 770e, linear first end walls 770d and second. It is configured by one magnet insertion hole formed by the end wall 770f, the first protrusion 770x, and the second protrusion 770y. Hereinafter, it is referred to as “magnet insertion hole 770”. The magnet insertion hole 770 is formed in an arc shape protruding to the outer peripheral side (having an arc-shaped cross section).
The permanent magnet 780 includes a first permanent magnet piece 781 and a second permanent magnet piece 782 that are inserted into the magnet insertion hole 770. The first permanent magnet piece 781 and the second permanent magnet piece 782 include arc-shaped inner walls 781a and 782a and outer walls 781b and 782b extending in parallel, linear first end walls 781c and 782c, and a second It has an arc-shaped cross section formed by the end walls 781d and 782d. The permanent magnet 780 is arranged in an arc shape protruding to the outer peripheral side.
In the present embodiment, as in the thirteenth embodiment, the permanent magnet 780 (the first permanent magnet piece 781 and the second permanent magnet piece 782) is formed by the first protrusion 770x and the second protrusion 770y. The position can be set.
In addition, the outer peripheral surface 721 of the rotor 720 is formed in a first outer peripheral portion 721a formed in an arc shape (radius R1) intersecting with the d axis and an arc shape (radius R2> radius R1) intersecting with the q axis. The second outer peripheral portions 721b thus formed are alternately connected.

In the fourteenth embodiment, the magnet insertion portion is formed in a protruding shape protruding to the outer peripheral side (arranged in a protruding shape where the permanent magnet protrudes to the outer peripheral side). Thereby, a magnet surface area increases and the amount of magnetic flux increases. Further, although the reluctance torque is reduced, the iron loss accompanying the generation of the reluctance torque can be reduced, and the decrease in the magnetic flux amount due to the armature reaction can be suppressed.
In particular, in the fourteenth embodiment, the magnet insertion portion is formed in an arc shape (permanent magnets are arranged in an arc shape). As a result, similarly to the second embodiment, it is possible to further suppress the decrease in the effective magnetic flux amount due to the armature reaction, and to further reduce the harmonic components included in the electromotive force waveform.
Moreover, since the positioning part which positions a permanent magnet is provided in the magnet insertion part, the 1st space part and 2nd space part for preventing the magnetic flux short circuit in the both ends of a permanent magnet are changed easily. be able to.
Further, the outer peripheral surface of the rotor alternates between a first outer peripheral portion having an arc shape (radius R1) intersecting with the d axis and a second outer peripheral portion having an arc shape intersecting with the q axis (radius R2> radius R1). Connected to and configured.
Therefore, the efficiency of the permanent magnet motor can be improved.

A fifteenth embodiment of the permanent magnet motor of the present invention is shown in FIGS. FIG. 22 is a cross-sectional view of the permanent magnet motor 800 according to the fifteenth embodiment viewed from a direction perpendicular to the axial direction, and FIG. 23 is a partially enlarged view of FIG.
The permanent magnet motor 800 of the fifteenth embodiment is different from the permanent magnet motor 600 of the eleventh embodiment in the configuration of the magnet insertion portion 830 and the permanent magnet 840. Therefore, the configuration of the magnet insertion portion 830 and the permanent magnet 840 of the permanent magnet electric motor 800 of the fifteenth embodiment will be described below. 22 and 23, components other than the magnet insertion portion 830 and the permanent magnet 840 are denoted by the same reference numerals as those shown in FIGS. 16 and 17 except for the numbers in the hundreds. The components that are present are the same components.

  The magnet insertion portion 830 includes a first magnet insertion hole 831 and a second magnet insertion hole 832 that are arranged along the circumferential direction. The first magnet insertion hole 831 and the second magnet insertion hole 832 have linear inner walls 831a and 832a and outer walls 831b and 832b extending in parallel, linear outer peripheral walls 831d and 832d, and linear first walls. It has a linear cross section formed by the end walls 831c and 832c, the linear second end walls 831e and 832e, the first protrusion 831x, and the second protrusion 832y. The magnet insertion portion 830 is formed in a V shape protruding to the outer peripheral side.

  The permanent magnet 840 includes a first permanent magnet piece 841 and a second permanent magnet piece 842 that are inserted into the first magnet insertion hole 831 and the second magnet insertion hole 832. As in the eleventh embodiment, the first permanent magnet piece 841 and the second permanent magnet piece 842 include inner walls 841a and 842a, outer walls 841b and 842b, first end walls 841c and 842c, and second end walls. It has a rectangular cross section formed by 841d and 842d. The permanent magnet 840 is arranged in a V shape protruding to the outer peripheral side.

  In the present embodiment, similarly to the eleventh embodiment, the outer peripheral walls of the magnet insertion portion 830 at both ends along the circumferential direction (the outer peripheral wall 831d of the first magnet insertion hole 831 and the second magnet insertion hole 832). Between the outer peripheral wall 832d) and the outer peripheral surface 821 of the rotor 820, that is, both end walls of the permanent magnet 840 along the circumferential direction (the second end wall 842d of the first permanent magnet piece 841 and the second permanent wall). A first bridge portion 860a and a second bridge portion 860b are formed between the second end wall 842d) of the magnet piece 842 and the outer peripheral surface 821 of the rotor 820. A third bridge portion 860c is formed between the first magnet insertion hole 831 and the second magnet insertion hole 832 (between the first permanent magnet piece 841 and the second permanent magnet piece 842). Yes. The strength with respect to the centrifugal force of the rotor 820 is further increased by the third bridge portion 860c.

Also, both end portions of the magnet insertion hole 830, that is, both end walls of the permanent magnet 840 (the second end wall 842d of the first permanent magnet piece 841 and the second end wall 842d of the second permanent magnet piece 842) Between the both end walls of the magnet insertion portion 830 (the second end wall 831e of the first magnet insertion hole 831 and the second end wall 832e of the second magnet insertion hole 832), at both ends of the permanent magnet 840 One space portion 850a and a second space portion 850b for preventing a short circuit of magnetic flux are formed.
In the present embodiment, the position of the permanent magnet 840 (the position of the first permanent magnet piece 841 and the second permanent magnet piece 842) is set by the first protrusion 831x and the second protrusion 832y. Can do. Thereby, the length along the circumferential direction of the 1st space part 850a and the 2nd space part 850b can be changed easily, and the short circuit of the magnetic flux in the both ends of the permanent magnet 840 can be prevented reliably. it can.
Further, the outer peripheral surface 821 of the rotor 820 is formed in a first outer peripheral portion 821a formed in an arc shape (radius R1) intersecting with the d axis and an arc shape (radius R2> radius R1) intersecting with the q axis. The second outer peripheral portions 821b thus formed are alternately connected.

In the fifteenth embodiment, the magnet insertion portion is formed in a protruding shape protruding to the outer peripheral side (arranged in a protruding shape where the permanent magnet protrudes to the outer peripheral side). Thereby, a magnet surface area increases and the amount of magnetic flux increases. Further, although the reluctance torque is reduced, the iron loss accompanying the generation of the reluctance torque can be reduced, and the decrease in the magnetic flux amount due to the armature reaction can be suppressed.
In particular, in the fifteenth embodiment, the magnet insertion portion is formed in a V shape (permanent magnets are arranged in a V shape). Thereby, the fall of the effective magnetic flux amount by armature reaction can be suppressed more similarly to 9th Embodiment.
Moreover, the magnet insertion part is comprised by the several magnet insertion hole arrange | positioned along the circumferential direction via the bridge part (The permanent magnet is arrange | positioned along the circumferential direction via the bridge part. By being composed of a plurality of permanent magnet pieces), the strength of the rotor against centrifugal force is increased.
Moreover, since the positioning part which positions a permanent magnet is provided in the magnet insertion part, the 1st space part and 2nd space part for preventing the magnetic flux short circuit in the both ends of a permanent magnet are changed easily. be able to.
The outer peripheral surface of the rotor has a first outer peripheral portion formed in an arc shape (radius R1) intersecting with the d axis and an arc shape intersecting with the q axis (radius R2> radius R1). The two outer peripheral portions are alternately connected.
Therefore, the efficiency of the permanent magnet motor can be improved.

A sixteenth embodiment of the permanent magnet motor of the present invention is shown in FIG. FIG. 24 is a partially enlarged view of the permanent magnet motor of the sixteenth embodiment. The permanent magnet motor of the sixteenth embodiment differs from the permanent magnet motor of the fifteenth embodiment in the configuration of the magnet insertion part 870 and the permanent magnet 880.
Therefore, hereinafter, the magnet insertion portion 870 and the permanent magnet 880 of the permanent magnet motor of the sixteenth embodiment will be described. In FIG. 24, regarding the constituent elements other than the magnet insertion portion 870 and the permanent magnet 880, constituent elements having the same reference numerals as those shown in FIG. 23 are the same constituent elements.

The magnet insertion portion 870 includes a first magnet insertion hole 871 and a second magnet insertion hole 872 that are arranged along the circumferential direction. The first magnet insertion hole 871 and the second magnet insertion hole 872 are arc-shaped inner walls 871a and 872a and outer walls 871b and 872b extending in parallel, linear outer peripheral walls 871d and 872d, and linear first It has an arc-shaped cross section formed by the end walls 871c and 872c, the linear second end walls 871e and 872e, the first protrusion 871x, and the second protrusion 872y. The magnet insertion part 870 is formed in an arc shape protruding to the outer peripheral side.
The permanent magnet 880 includes a first permanent magnet piece 881 and a second permanent magnet piece 882 that are inserted into the first magnet insertion hole 871 and the second magnet insertion hole 872. The first permanent magnet piece 881 and the second permanent magnet piece 882 include arc-shaped inner walls 881a and 882a and outer walls 881b and 882b extending in parallel, linear first end walls 881c and 882c, and a second It has an arc-shaped cross section formed by the end walls 881d and 882d. Permanent magnet 880 is arranged in an arc shape protruding to the outer peripheral side.
In the present embodiment, as in the fifteenth embodiment, first to third bridge portions 860a to 860c and first and second space portions 850a and 850b are formed.
In the present embodiment, the position of the permanent magnet 880 (the position of the first permanent magnet piece 881 and the second permanent magnet piece 882) is set by the first protrusion 872x and the second protrusion 872y. Can do. Thus, the second end wall 881d of the first permanent magnet piece 881 and the second end wall 882d of the second permanent magnet piece 882 and the first magnet insertion are formed at both ends of the magnet insertion hole 870. Along the circumferential direction of the first space portion 850a and the second space portion 850b (formed between the second end wall 871e of the hole 871 and the second end wall 872e of the second magnet insertion hole 872). The length can be easily changed, and a short circuit of magnetic flux at both ends of the permanent magnet 840 can be reliably prevented.
Further, the outer peripheral surface 821 of the rotor 820 is formed in a first outer peripheral portion 821a formed in an arc shape (radius R1) intersecting with the d axis and an arc shape (radius R2> radius R1) intersecting with the q axis. The second outer peripheral portions 821b thus formed are alternately connected.

In the sixteenth embodiment, the magnet insertion portion is formed in a protruding shape protruding to the outer peripheral side (arranged in a protruding shape in which the permanent magnet protrudes to the outer peripheral side). Thereby, a magnet surface area increases and the amount of magnetic flux increases. Further, although the reluctance torque is reduced, the iron loss accompanying the generation of the reluctance torque can be reduced, and the decrease in the magnetic flux amount due to the armature reaction can be suppressed.
In particular, in the sixteenth embodiment, the magnet insertion portion is formed in an arc shape (permanent magnets are arranged in an arc shape). As a result, similarly to the second embodiment, it is possible to further suppress the decrease in the effective magnetic flux amount due to the armature reaction, and to further reduce the harmonic components included in the electromotive force waveform.
Moreover, the magnet insertion part is comprised by the several magnet insertion hole arrange | positioned along the circumferential direction via the bridge part (The permanent magnet is arrange | positioned along the circumferential direction via the bridge part. By being composed of a plurality of permanent magnet pieces), the strength of the rotor against centrifugal force is increased.
Moreover, since the positioning part which positions a permanent magnet is provided in the magnet insertion part, the 1st space part and 2nd space part for preventing the magnetic flux short circuit in the both ends of a permanent magnet are changed easily. be able to.
The outer peripheral surface of the rotor has a first outer peripheral portion formed in an arc shape (radius R1) intersecting with the d axis and an arc shape intersecting with the q axis (radius R2> radius R1). The two outer peripheral portions are alternately connected.
Therefore, the efficiency of the permanent magnet motor can be improved.

The present invention is not limited to the configuration described in the embodiment, and various changes, additions, and deletions are possible.
In the embodiment, the magnet insertion port having a trapezoidal shape, an arc shape, and a V shape protruding to the outer peripheral side of the rotor is formed, but the shape of the magnet insertion hole is a protruding shape protruding to the outer peripheral side of the rotor If it is. As the protrusion shape, an appropriate protrusion shape combining straight lines and curves can be selected. In addition, since the magnet insertion hole is formed in a protruding shape protruding on the outer peripheral side of the rotor, the permanent magnet inserted into the magnet insertion hole is arranged in a protruding shape protruding on the outer peripheral side of the rotor. .
In the embodiment, the magnet insertion hole is formed in the main magnetic pole portion, and the permanent magnet is inserted into the magnet insertion hole. However, the aspect of disposing the permanent magnet is not limited to this. For example, the aspect which arrange | positions a permanent magnet to a rotor by adhesion | attachment, integral molding, etc. can also be used. In other words, the present invention can also be configured as a permanent magnet electric motor “where the permanent magnets are arranged in a protruding shape protruding to the outer peripheral side”.
The number and shape of the magnet insertion holes constituting the magnet insertion part of the main magnetic pole part can be changed as appropriate.
The number and shape of the permanent magnet pieces constituting the permanent magnet disposed in the main magnetic pole portion can be appropriately changed.
The shape and number of positioning portions for positioning the permanent magnet in the magnet insertion portion can be changed as appropriate. Further, the positioning portion can be omitted.
The outer peripheral surface of the rotor can be formed in various shapes in which the gap G2 along the q axis is larger than the gap G1 along the d axis.
The permanent magnet motor of the present invention can be used as an electric motor for driving various devices.

100, 200, 300, 400, 500, 600, 700, 800 Permanent magnet motor 110, 210, 310, 410, 510, 610, 710, 810 Stator 111, 211, 311, 411, 511, 611, 711, 811 Yoke part 112, 212, 312, 412, 512, 612, 712, 812 Teeth part 112a, 212a, 312a, 412a, 512a, 612a, 712a, 812a Teeth base part 112b, 212b, 312b, 412b, 512b, 612b, 712b, 812b Teeth tip 113, 213, 313, 413, 513, 613, 713, 813 Teeth tip 114, 214, 314, 414, 514, 614, 714, 814 Slot 120, 220, 320, 420, 520, 620 720, 820 Rotor 121, 221, 321, 421, 521, 621, 721, 821 Outer peripheral surface 121a, 221a, 321a, 421a, 521a, 621a, 721a, 821a First outer peripheral portion 121b, 221b, 321b, 421b, 521b, 621b, 721b, 821b Second outer peripheral portion 121A, 121B, 221A, 221B, 321A, 321B, 421A, 421B, 521A, 521B, 621A, 621B, 721A, 721B, 821A, 821B Connection portion 122, 222, 322 422, 522, 622, 722, 822 Rotating shaft insertion hole 123, 223, 323, 423, 523, 623, 723, 823 Caulking pin insertion hole 124, 224, 324, 424, 524, 624, 724, 824 Passage hole 13 170, 230, 270, 330, 370, 430, 470, 530, 570, 630, 670, 730, 770, 830, 870 Magnet insertion part 130a, 130b, 130c, 170a, 231a, 232a, 233a, 271a, 272a 273a, 330a, 330b, 330c, 370a, 431a, 432a, 433a, 471a, 472a, 473a, 530a, 530b, 570a, 631a, 632a, 671a, 672a, 730a, 730b, 770a, 831a, 832a, 871a, 872a Inner walls 130d, 130e, 130f, 170b, 231b, 232b, 233b, 271b, 272b, 273b, 330d, 330e, 330f, 370b, 431b, 432b, 433b, 471b, 472b, 4 73b, 530c, 530d, 570b, 631b, 632b, 671b, 672b, 730c, 730d, 770b, 831b, 832b, 871b, 872b Outer wall 130g, 130i, 170c, 170e, 232d, 233d, 272d, 273d, 330g, 330i, 370c, 370e, 432d, 433d, 472d, 473d, 530e, 530g, 570c, 570e, 631d, 632d, 671d, 672d, 730e, 730g, 770c, 770e, 831d, 832d, 871d, 872d Outer wall 130h, 130j, 170d 170f, 231c, 231d, 232c, 232e, 233c, 233e, 271c, 271d, 272c, 272e, 273c, 273e, 330h, 330j, 370d, 70f, 431c, 431d, 432c, 432e, 433c, 433e, 471c, 471d, 472c, 472e, 473c, 473e, 530f, 530h, 570d, 570f, 631c, 631e, 632c, 632e, 671c, 671e, 672c, 672e, 730f, 730h, 770d, 770f, 831c, 831e, 832c, 832e, 871c, 871e, 872c, 872e End wall 140, 180, 240, 280, 340, 380, 440, 480, 540, 580, 640, 680, 740 , 780, 840, 880 Permanent magnets 141, 142, 143, 181, 182, 183, 241, 242, 243, 281, 282, 283, 341, 342, 343, 381, 382, 383, 441, 442, 43, 481, 482, 483, 541, 542, 581, 582, 641, 642, 681, 682, 741, 742, 781, 782, 841, 842, 881, 882 Permanent magnet pieces 141a, 142a, 143a, 181a, 182a, 183a, 241a, 242a, 243a, 281a, 282a, 283a, 341a, 342a, 343a, 381a, 382a, 383a, 441a, 442a, 443a, 481a, 482a, 483a, 541a, 542a, 581a, 582a, 641 642a, 681a, 682a, 741a, 742a, 781a, 782a, 841a, 842a, 871, 872a Inner wall 141b, 142b, 143b, 181b, 182b, 183b, 241b, 242b, 243b, 281b , 282b, 283b, 341b, 342b, 343b, 381b, 382b, 383b, 441b, 442b, 443b, 481b, 482b, 483b, 541b, 542b, 581b, 582b, 641b, 642b, 681b, 682b, 741b, 742b, 781b 782b, 841b, 842b, 871b, 872b Outer wall 141c, 141d, 142c, 142d, 143c, 143d, 181c, 181d, 182c, 182d, 183c, 183d, 241c, 241d, 242c, 242d, 243c, 243d, 281c, 281d , 282c, 282d, 283c, 283d, 341c, 341d, 342c, 342d, 343c, 343d, 381c, 381d, 382c, 382d, 383c, 383d, 4 41c, 441d, 442c, 442d, 443c, 443d, 481c, 481d, 482c, 482d, 483c, 483d, 541c, 541d, 542c, 542d, 581c, 581d, 582c, 582d, 641c, 641d, 642c, 642d, 682c 681d, 682c, 682d, 741c, 741d, 742c, 742d, 781c, 781d, 782c, 782d, 841c, 841d, 842c, 842d, 871c, 871d, 872c, 872d End walls 150a, 150b, 250a, 250b, 350a, 350b 450a, 450b, 550a, 550b, 650a, 650b, 750a, 750b, 850a, 850b Space portions 160a, 160b, 260a, 260b, 260c, 260d, 60a, 360b, 460a, 460b, 460c, 460d, 560a, 560b, 660a, 660b, 660c, 760a, 760b, 860a, 860b, 860c Bridge portions 231, 232, 233, 271, 272, 273, 431, 432, 433 , 471, 472, 473, 631, 632, 671, 672, 831, 832, 871, 872 Magnet insertion holes [A] to [D] Main magnetic pole part [AB] to [DA] Auxiliary magnetic pole part

Claims (6)

A stator and a rotor arranged in the stator via a gap; the rotor has a main magnetic pole portion and an auxiliary magnetic pole portion alternately along the circumferential direction when viewed in a cross section perpendicular to the axial direction; A permanent magnet motor in which a permanent magnet is disposed in the main magnetic pole part,
The permanent magnet is arranged in a protruding shape in which a central portion along the circumferential direction protrudes from both end portions to the outer peripheral side of the rotor, as seen in a cross section perpendicular to the axial direction.
A first space portion and a second space portion are formed between one end wall and the other end wall of the permanent magnet in the circumferential direction and the outer peripheral surface of the rotor,
When the outer peripheral surface of the rotor is viewed in a cross section perpendicular to the axial direction, the gap interval along the q axis of the auxiliary magnetic pole portion is longer than the gap interval along the d axis of the main magnetic pole portion. A permanent magnet motor characterized by being formed. The permanent magnet motor according to claim 1,
The outer peripheral surface of the rotor is formed by alternately connecting a first outer peripheral portion that intersects the d-axis of the main magnetic pole portion and a second outer peripheral portion that intersects the q-axis of the auxiliary magnetic pole portion. The first outer peripheral portion is formed in an arc shape having a center point on the d-axis, and the second outer peripheral portion has a center point on the q-axis, and is smaller than the radius of the first outer peripheral portion. A permanent magnet motor characterized by being formed in an arc shape having a large radius. The permanent magnet motor according to claim 1 or 2,
The permanent magnet motor is characterized in that the permanent magnets are arranged in a trapezoidal shape. The permanent magnet motor according to claim 1 or 2,
The permanent magnet motor, wherein the permanent magnets are arranged in an arc shape. The permanent magnet electric motor according to any one of claims 1 to 4,
The permanent magnet is composed of a plurality of permanent magnet pieces arranged along the circumferential direction via a bridge portion,
Between the one end wall along the circumferential direction of the permanent magnet piece arranged at one end along the circumferential direction of the plurality of permanent magnet pieces and the outer peripheral surface of the rotor, the first A space portion is formed, and the second space portion is disposed between the other end wall along the circumferential direction of the permanent magnet piece disposed at the other end along the circumferential direction and the outer peripheral surface of the rotor. A permanent magnet motor characterized by being formed.   A device driving apparatus comprising a device and an electric motor that drives the device, wherein the permanent magnet motor according to any one of claims 1 to 5 is used as the electric motor. Drive device.

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