JP2016063650A - Permanent magnet type electrical rotating machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a permanent magnet type electrical rotating machine capable of improving the reliability by reducing vibrations/noises on an electrical rotating machine.SOLUTION: The permanent magnet type electrical rotating machine includes: a rotator which has plural permanent magnets disposed in a circumferential direction around a rotation axis, on which plural magnetic pole parts are formed in the circumferential direction; and a stator including an armature winding and a stator core, which is disposed around the rotator. The rotator has an unequal disposition shape that, in one or more magnetic pole parts in the plural magnetic pole parts, a cross-sectional shape perpendicular to the rotation axis is different from that of the other magnetic pole parts.SELECTED DRAWING: Figure 2

Description

  Embodiments described herein relate generally to a permanent magnet type rotating electrical machine.

  In recent years, permanent magnets with a high magnetic energy product have been developed, and it is possible to reduce the size and output of permanent magnet type rotating electrical machines. The permanent magnet type rotating electrical machine includes a stator and a rotor. The stator includes a stator core and an armature winding, and a rotor is provided inside the stator with a predetermined gap therebetween. The stator core is configured by laminating a plurality of electromagnetic steel plates. A stator slot for accommodating the armature winding and a stator tooth facing the rotor are formed on the inner peripheral side of the stator core. The stator is supported and fixed to the stator frame on the outer peripheral side, for example, by shrink fitting or press fitting.

  In such a permanent magnet type rotating electric machine, when a current flows through the armature winding, a magnetic path passing through the stator core, the air gap, and the magnetic pole part of the rotor is formed, and the stator teeth and the magnetic poles of the rotor are formed. An electromagnetic force (magnetic attraction force) attracting each other is generated between the two portions.

JP 2002-51503 A JP 7-154950 A

  In the permanent magnet type rotating electrical machine, the electromagnetic force generated at each magnetic pole portion vibrates the stator core via the stator teeth. In addition, a natural vibration mode having the same shape as the electromagnetic force distribution of the stator core exists within the rotation speed range, and when the natural frequency matches the frequency of the electromagnetic force, the stator core generates a resonance phenomenon. This resonance phenomenon generates a great deal of vibration and noise.

  An object of an embodiment of the present invention is to provide a permanent magnet type rotating electrical machine capable of reducing the vibration and noise of the rotating electrical machine and improving the reliability.

  A permanent magnet type rotating electrical machine according to an embodiment includes a rotor having a plurality of permanent magnets arranged in a circumferential direction around a rotation axis, and a plurality of magnetic pole portions formed in the circumferential direction, and the rotor And a stator including an armature winding and a stator core, and the rotor is a surface orthogonal to the rotation axis in any one or more of the magnetic pole portions. This is characterized by an uneven shape including a shape changing portion different from the other magnetic pole portions.

Sectional drawing which shows the structure of the permanent magnet type rotary electric machine which concerns on 1st Embodiment. Sectional drawing which shows 1 pole of the permanent magnet type rotary electric machine. Explanatory drawing which shows the electromagnetic force distribution and natural vibration mode of the permanent magnet type | mold rotary electric machine. Explanatory drawing which shows the electromagnetic excitation force mode of the permanent magnet type rotary electric machine. Sectional drawing which shows the structure of the permanent magnet type rotary electric machine which concerns on 2nd Embodiment. Sectional drawing which shows 1 pole of the permanent magnet type rotary electric machine. Explanatory drawing which shows the electromagnetic force distribution and natural vibration mode of the permanent magnet type | mold rotary electric machine. Explanatory drawing which shows the electromagnetic excitation force mode of the permanent magnet type rotary electric machine. Sectional drawing which shows 1 pole of the permanent magnet type rotary electric machine concerning other embodiment.

[First embodiment]
Hereinafter, a permanent magnet type rotating electrical machine 1 according to a first embodiment of the present invention will be described with reference to FIGS. In each drawing, the configuration is appropriately enlarged, reduced, or omitted for explanation.

  FIG. 1 is a cross-sectional view of a permanent magnet type rotating electrical machine 1 according to the embodiment, and FIG. 2 is an enlarged cross-sectional view showing one magnetic force change pole Ma of the permanent magnet type rotating electrical machine 1.

  The permanent magnet type rotating electrical machine 1 shown in FIGS. 1 and 2 is a so-called permanent magnet type reluctance motor, and includes a stator 10 and a rotor 20. In the present embodiment, a permanent magnet type rotating electrical machine 1 having 8 poles and 48 stator slots 13 is shown as an example.

  The stator 10 includes a stator core 11 and an armature winding 14 and is configured in a cylindrical shape. The stator core 11 has a cylindrical shape, and a plurality of stator teeth 12 are provided in parallel in the rotation direction on the inner peripheral surface side thereof. The tips of the stator teeth 12 face the outer peripheral surface of the rotor 20 with a predetermined air gap G1 (gap) interposed therebetween. Stator slots 13 are formed between the stator teeth 12 adjacent to each other in the rotational direction. Armature windings 14 are respectively arranged in a plurality of stator slots 13 arranged in parallel in the rotation direction. The outer periphery of the stator 10 is supported and fixed to the frame by shrink fitting or press fitting. A rotor 20 is provided inside the stator 10.

  The rotor 20 is disposed inside the stator 10 with an air gap G1 interposed between the rotor 20 and the tip of the stator teeth 12. The rotor 20 includes a rotor core 21 configured in a columnar shape, and a permanent magnet 25 embedded in the rotor core 21. The rotor 20 rotates about the rotation axis by a rotating magnetic field generated by the current flowing through the armature winding 14 provided in the stator core 11.

  The rotor core 21 is formed in a cylindrical shape by laminating a plurality of electromagnetic steel plates in the axial direction. On the outer peripheral surface of the rotor core 21, magnetic convex portions that are easy to pass magnetic flux and magnetic concave portions that are difficult to pass magnetic flux are alternately formed in the circumferential direction (circumferential direction) around the rotation axis. A plurality of magnetic pole portions are formed in the circumferential direction.

  Each pole of the rotor core 21 is formed with a pair of magnet holding holes 22 over the entire length in the axial direction.

  The magnet holding hole 22 is located at the slit portion 22a in which the permanent magnet 25 is accommodated, the outer gap portion 22b located at the end portion on the outer peripheral side of the slit portion 22a, and the end portion on the axis C1 side of the slit portion 22a. The inner gap portion 22c is continuously and integrally provided.

  The slit portions 22 a of the pair of magnet holding holes 22 are configured to have a rectangular shape with a predetermined width corresponding to the cross-sectional shape of the permanent magnet 25 in a cross section orthogonal to the rotation axis. The pair of slit portions 22a is disposed in a V shape that is inclined with respect to the center line C2 extending in the radial direction and opens outward in the radial direction.

The inner gap portion 22c is continuous with the inner end of the slit portion 22a and extends inward along the radial direction. The outer space 22b is continuous with the outer end of the slit 22a and extends along the circumferential direction. The magnet holding hole 22 is close to the outer peripheral surface of the rotor core 21, and a thickened portion is formed between the outer space 22 b of the magnet holding hole 22 and the outer peripheral surface of the rotor core 21.

  Permanent magnets 25 are fitted into magnet holding holes 22 formed in pairs on each pole, and fixed by an adhesive or the like. The polarity of the pair of permanent magnets 25 corresponding to one pole is set so that the sides facing the outer peripheral surface of the rotor core 21 have the same polarity with each other and have opposite polarities to the adjacent magnetic poles. ing.

  Further, a hole 23 is formed as a non-magnetic portion over the entire length in the axial direction from the outer periphery of the intermediate portion of the pair of magnet holding holes 22 of the rotor core 21. The air holes 23 are formed in a triangular shape having two V-shaped sides that open radially outward and one side along the outer peripheral surface.

Among the eight magnetic pole portions formed in the circumferential direction, the predetermined three poles constitute a magnetic force change pole Ma configured to suppress the electromagnetic excitation force more than the other poles. That is, the magnetic pole has eight magnetic poles in the circumferential direction, and three magnetic pole portions of the eight poles are the magnetic force change poles Ma, and are arranged so that the distribution of the magnetic excitation force is a three-diameter node. Yes.

  The magnetic force change pole Ma has a shape change portion 26 having a shape different from that of the other poles. In this embodiment, a total of three poles, one pole at the top in FIG. 1 and one pole on each side with two poles in between in the circumferential direction, are set as the magnetic force change pole Ma. did.

  In the magnetic force change pole Ma, the outer gap 22b of one of the magnet holding holes 22 of the pair extends from the outer end of the slit 22a in both the direction away from the center line C2 and the direction approaching the center line C2. Is formed. In the other magnet holding hole 22 of the magnetic force change pole Ma and the pair of magnet holding holes 22 of the remaining five magnetic pole portions that are not the magnetic force change pole Ma, the outer gap portion 22b is formed from the outer end portion of the slit portion 22a. It extends only in the direction away from the center line C2. That is, in the magnetic force change pole Ma, the shape of the magnet holding hole 22 to be paired is different, and the outer gap 22b of one magnet holding hole has a circumferential dimension x1 in the circumferential direction of the outer gap 22b of the other magnet holding hole 22. It is longer than the dimension x2. This one magnet holding hole constitutes the shape changing portion 26. In the other five-pole magnetic pole portions, the paired magnet holding holes 22 have the same shape and are symmetrical with respect to the center line C2. Therefore, the permanent magnet type rotating electrical machine 1 has the shape change portion 26 in the magnetic force change pole Ma, so that the cross-sectional shape is unevenly distributed in the circumferential direction.

  In the magnetic force change pole Ma, since one magnet holding hole 22 has a shorter distance between the hole 23 and the outer gap 22b than the other magnet holding hole 22, the magnetic resistance is increased. Therefore, the electromagnetic excitation force is suppressed.

  In the permanent magnet type rotating electrical machine 1 configured as described above, by passing a current through the armature winding 14, a magnetic path passing through the stator core 11, the air gap G1, and the magnetic pole part of the rotor 20 is formed. An electromagnetic force (magnetic attraction force) attracting each other is generated between the stator teeth 12 and the magnetic pole portions of the rotor 20. At this time, the electromagnetic excitation force in the magnetic force change portion Ma is suppressed, so that the electromagnetic excitation force is non-uniform in the circumferential direction of the octupole structure.

  Hereinafter, the electromagnetic excitation force mode of this embodiment will be described with reference to FIGS. 3 and 4. FIG. 3 is an explanatory diagram showing an electromagnetic excitation force mode of the permanent magnet type rotating electrical machine 1 according to the present embodiment.

  In FIG. 3, the electromagnetic excitation force of the permanent magnet type rotating electrical machine 1 according to the present embodiment is indicated by a dotted line. Further, as a comparative example, the electromagnetic excitation force of the permanent magnet type rotating electrical machine 1A having a structure in which the magnet holding holes 22 of all eight poles are symmetrical is shown by a two-dot chain line.

  As shown in FIG. 3, in Comparative Example 1 in which the rotor 20 has a uniform shape and the shape of the magnet holding hole 22 is symmetric in all the magnetic poles, the electromagnetic excitation force has an eight-pole configuration and has eight diameter nodes. The electromagnetic excitation force mode is (K = 8).

  On the other hand, in the permanent magnet type rotating electrical machine 1 according to the present embodiment, the electromagnetic excitation force is suppressed by the shape changing unit 26 at the three magnetic force change poles Ma, which is 80% or less of the electromagnetic excitation force of the other poles. It is as small as 70%. In these magnetic force change poles Ma, the magnitude of the electromagnetic excitation force is different from that of other magnetic pole portions that are not provided with an asymmetric cross section, so that the electromagnetic excitation force is set to have three diameter nodes (K = 3) in the circumferential direction. Thus, the electromagnetic force excitation mode of the permanent magnet type rotating electric machine is a three-pole diameter node mode.

  FIG. 4 shows the vibration response with respect to the frequency of the permanent magnet type rotating electrical machine 1. In FIG. 4, the vibration response of the permanent magnet type rotating electrical machine 1 according to the present embodiment is shown by a solid line, and as a comparative example, the vibration response of the permanent magnet type rotating electrical machine 1 having an eight pole magnetic pole structure is shown by a two-dot chain line. .

As shown in FIG. 4, the vibration response of the comparative example is an annular vibration mode with two diameter nodes (K = 2), four diameter nodes (K = 4), and five diameter nodes (K = 5) in the operating frequency range. Is vibrating.

  On the other hand, since the permanent magnet type rotating electrical machine 1 of the present embodiment has an electromagnetic excitation force distribution of 3 diameter nodes (K = 3) in the circumferential direction, a 4 diameter node (motor annular vibration mode) K = 4) is difficult to be excited (vibrated), and the vibration response level at the four diameter nodes is smaller than that of the comparative example.

  According to the permanent magnet type rotating electrical machine 1 according to the present embodiment, the peak of the electromagnetic force is reduced and the resonance phenomenon is prevented with a simple configuration in which the sectional shape of the rotor core 21 is asymmetrical at the magnetic force change pole Ma. It becomes possible. That is, generally, there exists a natural vibration mode having the same shape as the electromagnetic force distribution of the stator core 11 within the rotation speed range, and when the natural frequency and the frequency of the electromagnetic force coincide with each other, the stator core 11 has a resonance phenomenon. However, in this embodiment, by adjusting the electromagnetic excitation force, the shape of the natural vibration mode and the electromagnetic force distribution can be shifted to suppress excitation. Here, by setting the electromagnetic excitation force distribution to K = 3, the circular vibration mode (n = 4) of four diameter nodes and excitation were suppressed.

  Further, since the excitation can be suppressed with a simple configuration that only lengthens a part of the size of the magnet holding hole 22, vibration and noise of the rotating electrical machine can be reduced without reducing the performance of the rotating electrical machine and increasing the volume and weight. , Reliability can be improved. In particular, in a small and lightweight rotating electrical machine for a vehicle or the like, the thickness of the frame and the case disposed on the outer side of the stator core 11 cannot be a robust structure, but in this embodiment, the hole of the rotor core 21 is not provided. By simply changing the shape, the vibration and noise of the rotating electrical machine can be reduced and the reliability can be improved. In addition, when a wide range of variable speed range is required, such as a rotating electrical machine used in a vehicle application, and the frequency of the electromagnetic force that serves as the excitation source is wide, the stator core is generally used as a countermeasure against vibration and noise. It is difficult to use a method that avoids the resonance phenomenon by changing the dimensional shape, support method, or mass of the stator frame, the frame, and detuning the natural frequency (frequency) of the rotating electrical machine outside the operating frequency range. However, according to the above-described embodiment, even in the case of dealing with a wide range of frequencies, without reducing the performance of the rotating electrical machine and increasing the volume and weight, the vibration and noise of the rotating electrical machine are reduced, and the reliability is improved. Can be improved.

  Further, by minimizing the shape changing portion 26 to three places, it is possible to reduce the vibration response level and the noise while suppressing the deterioration of the motor characteristics such as the generated torque.

[Second Embodiment]
Hereinafter, the permanent magnet type rotating electrical machine 100 according to the second embodiment will be described with reference to FIGS. Note that the permanent magnet type rotating electrical machine 100 according to the second embodiment has four magnetic pole portions of eight poles with a magnetic force change pole Ma and a distribution of electromagnetic excitation force of four diameter nodes. The difference from the first embodiment is that the cross-sectional shape is changed in the outer peripheral portion of the rotor core 21 instead of the shape. Other than this, the permanent magnet type rotating electrical machine 1 according to the first embodiment is the same as the permanent magnet type rotating electrical machine 100 according to the second embodiment, and therefore the same as the permanent magnet type rotating electrical machine 1 according to the first embodiment. The same reference numerals are given to the components, and duplicate descriptions are omitted.

  FIG. 5 is a cross-sectional view of the permanent magnet type rotating electrical machine 100 according to the second embodiment, and FIG. 6 is a cross-sectional view of one pole thereof. As shown in FIGS. 5 and 6, the permanent magnet type rotating electrical machine 100 includes the stator 10 and the rotor 20, as in the permanent magnet type rotating electrical machine 1. The stator 10 has a cylindrical shape and a stator core 11 having a plurality of stator teeth 12 and a stator slot 13 formed on an inner peripheral surface, and an armature winding 14 accommodated in the stator slot 13. And comprising. The rotor 20 includes a columnar rotor core 21 in which a magnet holding hole 22 is formed, and a plurality of permanent magnets 25 accommodated in the magnet holding hole 22.

  A pair of magnet holding holes 22 is provided for each pole. The magnet holding hole 22 is located at the slit portion 22a in which the permanent magnet 25 is accommodated, the outer gap portion 22b located at the end portion on the outer peripheral side of the slit portion 22a, and the end portion on the axis C1 side of the slit portion 22a. The inner gap portion 22c is continuously and integrally provided. In each pole, the pair of slit portions 22a is arranged in a V shape that is inclined with respect to the center line C2 extending in the radial direction and opens outward in the radial direction. In the present embodiment, the magnet holding holes 22 that are paired in all the poles have the same shape and are symmetrical with respect to the center line C2.

  In the present embodiment, every four poles, four poles arranged at equal intervals at intervals of 90 degrees become magnetic force change poles Ma. In these four magnetic force change poles Ma, the outer peripheral shape of the rotor core 21 is different from the outer peripheral shape of the rotor core 21 in other magnetic poles, and a groove portion 24 is formed on the outer periphery of the rotor core 21. The groove portion 24 is, for example, a shape in which a part of the outer peripheral surface of the rotor core 21 is notched so as to be recessed inward over the entire length of the rotation shaft, and is biased to one side from the center line C2 of the corresponding pair of magnet holding holes 22. It is arranged at the position. This groove portion 24 forms a shape changing portion 26. The shape changing portions 26 are provided on some (here, four) magnetic poles. That is, in the permanent magnet type rotating electric machine 100, the cross-sectional shape of the rotor core 21 is asymmetrical at the magnetic force change pole Ma, the magnetic resistance between the rotor and the stator is increased by the groove of the shape changing portion 26, and the flowing magnetic flux is also Since it decreases, the electromagnetic excitation force is suppressed. Therefore, the electromagnetic excitation force of 8 poles in the circumferential direction is not uniform.

  Hereinafter, the electromagnetic excitation force mode of this embodiment will be described with reference to FIGS. FIG. 7 is an explanatory diagram showing an electromagnetic excitation force mode of the permanent magnet type rotating electrical machine 1 according to the present embodiment.

  In FIG. 7, the electromagnetic excitation force of the permanent magnet type rotating electrical machine 100 according to the present embodiment is indicated by a dotted line. In addition, as a comparative example, the electromagnetic excitation force of the permanent magnet type rotating electrical machine 1A having an equal distribution structure in which the rotor core 21 is not formed with the groove portion 24 and all the eight magnetic poles have the same shape is indicated by a two-dot chain line. .

  As shown in FIG. 7, in Comparative Example 1 in which the shape of the rotor 20 is equally distributed, the electromagnetic excitation force is an octupole rotor 20, and an electromagnetic excitation force mode of 8 diameter nodes (K = 8) It has become.

  On the other hand, in the permanent magnet type rotating electric machine 100 according to the present embodiment, the electromagnetic excitation force is suppressed by the shape changing unit 26 at the four magnetic force change poles Ma, and is 80% or less of the electromagnetic excitation force of the other poles. And it is as small as 60%. In these magnetic force change poles Ma, the magnitude of the electromagnetic excitation force is different from that of other magnetic pole portions that are not provided with an asymmetric cross section, so that the electromagnetic excitation force is set to 4 diameter nodes (K = 4) in the circumferential direction. Thus, the electromagnetic force excitation mode of the permanent magnet type rotating electric machine becomes a mode of a 4-pole diameter node.

  FIG. 8 shows the vibration response with respect to the frequency of the permanent magnet type rotating electric machine 100. In FIG. 8, the vibration response of the permanent magnet type rotating electrical machine 100 according to the present embodiment is shown by a solid line, and as a comparative example, the vibration response of the permanent magnet type rotating electrical machine 1 having an eight pole magnetic pole structure is shown by a two-dot chain line. .

  As shown in FIG. 8, the vibration response of the comparative example is an annular vibration mode with two diameter nodes (K = 2), four diameter nodes (K = 4), and five diameter nodes (K = 5) in the operating frequency range. Is vibrating.

  On the other hand, the permanent magnet type rotating electrical machine 100 of the present embodiment has a four-diameter node (K = 4) electromagnetic excitation force distribution in the circumferential direction, so that the two-diameter node (Motor ring vibration mode) K = 2) is difficult to be excited (vibrated), and the vibration response level at the two diameter nodes is smaller than that of the comparative example.

  Also in this embodiment, the same effect as the first embodiment can be obtained. That is, it is possible to reduce the peak of electromagnetic force and prevent a resonance phenomenon with a simple configuration in which the cross-sectional shape of the rotor core 21 is asymmetrical in the magnetic force change pole Ma. That is, by adjusting the electromagnetic excitation force, the shape of the natural vibration mode and the electromagnetic force distribution are shifted, and a four-diameter node in the circumferential direction and a cross-shaped electromagnetic excitation force distribution are obtained. It is possible to suppress and reduce the ring vibration mode.

  In addition, embodiment mentioned above is an illustration and does not limit the range of invention. For example, in the first embodiment, the shape of the magnet holding hole 22 is changed in the three magnetic poles, and in the second embodiment, the groove portion 24 is formed on the outer peripheral surface of the four poles. However, the configuration for changing the electromagnetic excitation force is limited to the above. It is not a thing. For example, the number of magnetic force change poles Ma and the combination of position and shape may be changed as appropriate.

For example, the groove 24 may be formed on the outer peripheral surface of the rotor core 21 with three magnetic poles, or the outer gap 22b of the magnet holding hole 22 may be elongated with four magnetic poles. In addition, it is possible to change the magnetism by changing other portions, for example, by changing the shape of the air holes 23. Also,
Although the example which changes the shape by the side of the rotor core 21 was shown in the said embodiment, it is not restricted to this. For example, as shown in FIG. 9 as another embodiment, in the magnetic force change pole Ma, the shape of the stator core 11 may be different from the shape of the stator core 11 in other magnetic poles. Good. For example, in the permanent magnet type rotating electrical machine 110 shown in FIG. 9, in the magnetic force change pole Ma, the tip end portion of the stator tooth 12 disposed to face one of the pair of permanent magnets 25 is formed short in the circumferential direction. . That is, a shape changing portion 26 having a partially different shape is provided on the fixed tooth 12 of the stator core 11 on the stator side that receives magnetic force. Thus, when the dimension of the front-end | tip part of the stator teeth 12 is short, since the magnetic resistance with a rotor will become large and the magnetic flux which flows will also reduce, electromagnetic exciting force is suppressed. Even in this case, in part, the electromagnetic excitation force mode can be adjusted by suppressing the electromagnetic force with a simple configuration in which the shape of the stator 10 is asymmetric. In addition, the electromagnetic excitation force may be adjusted, for example, by changing the width dimension of the stator teeth 12.

  In the embodiment described above, the end of the magnet holding hole near the outer periphery of the rotor is made different from the other pole in order to cause a difference between the other pole and the excitation force peak value. In order to minimize the magnetic path of the rotor core in order to suppress the electromagnetic excitation force, the shape of the magnetic path on one side of the pair is narrowed to minimize the decrease in generated torque. The shape of the magnet holding hole may not be asymmetric in the single pole. Moreover, in the said embodiment, in order to suppress more effectively, although the example made into 3 diameter nodes and 4 diameter nodes was shown, it is not restricted to this, If there is a pole with low electromagnetic force at least, It is possible to suppress vibration.

  In addition, although some embodiment of this invention was described, these embodiment is shown as an example and is not intending limiting the range of invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

DESCRIPTION OF SYMBOLS 1 ... Permanent magnet type rotary electric machine, 10 ... Stator, 11 ... Stator core, 12 ... Stator teeth, 13 ... Stator slot, 14 ... Armature winding, 20 ... Rotor, 21 ... Rotor core, 22 ... Magnet holding hole, 22a ... Slit part, 22b ... Outer air gap part, 22c ... Inner air gap part, 23 ... Air hole, 24 ... Groove part, 25 ... Permanent magnet, 26 ... Shape changing part, 100 ... Permanent magnet type rotating electric machine, 110: Permanent magnet type rotating electrical machine, G1: Air gap.

Claims (7)

A rotor having a plurality of permanent magnets arranged in the circumferential direction around the rotation axis, and a plurality of magnetic pole portions formed in the circumferential direction;
A stator disposed around the rotor and comprising an armature winding and a stator core;
With
The rotor has a nonuniform distribution in which at least one of the plurality of magnetic pole portions includes a shape changing portion in which the shape of the surface orthogonal to the rotation axis is different from the other magnetic pole portions. There is a permanent magnet type rotating electrical machine. The rotor includes a pair of magnet holding holes that respectively accommodate the permanent magnets in the plurality of magnetic pole portions,
2. The permanent magnet type rotating electric machine according to claim 1, wherein in the shape changing portion, the shape of one magnet holding hole of the pair is different from the shape of the other magnet holding hole. The rotor includes a pair of magnet holding holes for accommodating the permanent magnets in the magnetic pole portions, respectively.
3. The permanent magnet type rotating electric machine according to claim 1, wherein in the shape changing portion, the shape of the outer peripheral portion of the rotor is different from the shape of the outer peripheral portion of the rotor in another magnetic pole. A rotor having a plurality of permanent magnets arranged in the circumferential direction around the rotation axis, and a plurality of magnetic pole portions formed in the circumferential direction;
A stator disposed around the rotor and comprising an armature winding and a stator core;
With
The stator core includes a plurality of stator teeth formed in a cylindrical shape and arranged in the rotation direction on an inner peripheral side, and a plurality of slots respectively formed between the plurality of stator teeth. The armature winding is provided,
The stator has a nonuniform distribution in which the shape of any one or more of the stator teeth arranged in the circumferential direction is different from the shape of the other stator teeth. A permanent magnet type rotating electrical machine characterized by the above. A rotor having a plurality of permanent magnets arranged in the circumferential direction around the rotation axis, and an 8-pole magnetic pole portion formed in the circumferential direction;
A stator disposed around the rotor and comprising an armature winding and a stator core;
With
In one or more of the plurality of magnetic pole portions, the shape of the surface orthogonal to the rotation axis is different from the shape in the other magnetic pole portion, and includes a shape changing portion.
A permanent magnet type rotating electric machine, characterized in that the distribution of electromagnetic excitation force is arranged to be 4 diameter nodes.   The permanent magnet type rotating electric machine according to any one of claims 1 to 4, wherein the permanent magnet type rotating electric machine is provided with the magnetic pole portion having eight poles, and is arranged so that the distribution of electromagnetic excitation force is a three-diameter node.   The permanent magnet type rotating electric machine according to any one of claims 1 to 6, wherein the electromagnetic force of the magnetic pole corresponding to the shape changing portion is 70% or less of the electromagnetic force of the other magnetic pole.

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