WO2019097603A1

WO2019097603A1 - Permanent magnet type rotating electric machine

Info

Publication number: WO2019097603A1
Application number: PCT/JP2017/041095
Authority: WO
Inventors: 磯田　仁志; 純士北尾; 義浩深山; 拓真笹井
Original assignee: 三菱電機株式会社
Priority date: 2017-11-15
Filing date: 2017-11-15
Publication date: 2019-05-23
Also published as: JP6929379B2; CN111316537A; JPWO2019097603A1; CN111316537B; DE112017008150T5

Abstract

A permanent magnet type rotating electric machine relating to the present invention is provided with: a magnet inserting hole that is formed such that the magnet inserting hole penetrates a rotor core in the axis direction; a permanent magnet inserted into the magnet inserting hole; a flux barrier that is formed such that the flux barrier protrudes from the magnet inserting hole to both sides in the peripheral direction, and penetrates the rotor core in the axis direction; and a cutout that is formed on a q axis of the outer peripheral surface of the rotor core such that the cutout extends from one end to the other end in the axis direction. When the minimum iron width on the q axis is represented by C, and the cutout width in the peripheral direction is represented by D, C and D satisfy the relationship of C<D.

Description

Permanent magnet type rotating electric machine

The present invention relates to a permanent magnet type rotating electrical machine, and more particularly to a rotor structure.

In a rotating electric machine applied to an industrial motor, an electric car, a hybrid car and the like, a permanent magnet type rotating electric machine which does not require external field energy for size reduction and high output is widely used. The stator winding structure of this type of rotating electrical machine is roughly classified into two types: concentrated winding in which a coil is wound on one tooth and distributed winding in which a coil is wound across a plurality of teeth. Ru. The concentrated winding has a shorter coil end length than the distributed winding, so the motor axial length can be shortened. On the other hand, the magnetomotive force generated in the concentrated winding stator includes low-order harmonic components that do not contribute to torque, and due to these effects, an increase in torque ripple and an electromagnetic excitation having a low-order deformation mode Cause the occurrence of force and so on. Then, the frame resonates to generate noise when the electromagnetic excitation force is at a specific rotation number that matches the resonance frequency of a component of the rotating electrical machine, for example, the frame.

In view of such a situation, a conventional permanent magnet type rotary electric machine has been proposed in which a notch is provided on the q axis of the outer peripheral surface of the rotor core to reduce torque ripple (see, for example, Patent Documents 1 and 2) .

Unexamined-Japanese-Patent No. 2017-055560 Patent No. 5450472 gazette

The conventional permanent magnet type rotary electric machines described in

Patent Documents

1 and 2 have a structure that reduces torque ripple. However, this structure can not necessarily reduce the radial electromagnetic force generated on the teeth causing vibration and noise.

The present invention has been made to solve the above-described problems, and it is an object of the present invention to obtain a permanent magnet type rotary electric machine capable of reducing the radial electromagnetic force generated on teeth causing vibration and noise. .

In the permanent magnet type rotating electrical machine according to the present invention, a stator iron core is formed between the teeth in which teeth are radially projected from an annular core back and circumferentially arranged and slots are adjacent to each other in the circumferential direction; And a stator having a stator winding mounted on the stator core, and coaxially and rotatably disposed on the inner peripheral side of the stator via the magnetic gap with the stator. An annular rotor core, and a rotor having a plurality of permanent magnets circumferentially arranged on the rotor core to constitute a magnetic pole. The rotor core is formed so as to penetrate in the axial direction, and the magnet insertion hole into which the permanent magnet is inserted, and both circumferentially protruding from the magnet insertion hole, and penetrates the rotor core in the axial direction A flux barrier formed as described above, and a notch formed on one end of the axial direction to the other end on the q axis of the outer peripheral surface of the rotor core, and the minimum iron in the q axis When the width is C and the circumferential width of the notch is D, the C and D satisfy the relationship of C <D.

In the present invention, the circumferential width D of the notch portion is larger than the minimum iron width C in the q axis. As a result, the radial electromagnetic force generated in the teeth can be reduced, and the generation of vibration and noise can be suppressed.

It is a cross-sectional view which shows the permanent-magnet type rotary electric machine which concerns on Embodiment 1 of this invention. It is a principal part cross-sectional view which shows the surroundings of the permanent magnet of the rotor in the permanent-magnet type rotary electric machine which concerns on Embodiment 1 of this invention. Stress generated when a centrifugal force is applied to a rotor using a rotor core in which the cylindrical outer peripheral surface of the iron core and the outer diameter side wall surface of the flux barrier are parallel while satisfying the relationship A> C. It is a figure which shows the result of having analyzed. A rotor core using a rotor core in which the width of the iron portion between the cylindrical outer peripheral surface of the iron core and the outer diameter side wall surface of the flux barrier is increased toward the q axis while satisfying the relationship A> C. It is a figure which shows the result of having analyzed the stress which generate | occur | produces when a centrifugal force is made to act on a child. In the rotor core used in the analysis of FIG. 4, the rotor core using a rotor core with a smaller amount of protrusion of the flux barrier from the magnet insertion hole and satisfying the relationship of A <C is subjected to centrifugal force. It is a figure which shows the result of having analyzed the stress which generate | occur | produces when making it act. In the rotor core used in the analysis of FIG. 4, the result of analyzing the stress generated when a centrifugal force is applied to the rotor using the rotor core having the notched portion so as to satisfy A <B FIG. FIG. 6 is a diagram showing the results of analysis of magnetic flux lines generated at the time of current application in the rotating electrical machine on which the rotor used in the analysis of FIG. 3 is mounted. FIG. 5 is a diagram showing a result of analysis of magnetic flux lines generated at the time of current application in the rotating electrical machine on which the rotor used in the analysis of FIG. 4 is mounted. FIG. 7 is a diagram showing a result of analysis of magnetic flux lines generated at the time of current application in the rotating electrical machine on which the rotor used in the analysis of FIG. 6 is mounted. It is a figure which shows the result of having analyzed the radial direction electromagnetic force which generate | occur | produces to teeth by changing the minimum iron width C of a rotor core, and changing it. It is a cross-sectional view which shows the permanent-magnet type rotary electric machine which concerns on Embodiment 2 of this invention. It is a principal part cross-sectional view which shows the surroundings of the permanent magnet of the rotor in the permanent-magnet type rotary electric machine which concerns on Embodiment 2 of this invention.

Embodiment 1
FIG. 1 is a cross-sectional view showing a permanent magnet type rotary electric machine according to Embodiment 1 of the present invention, and FIG. 2 is a view around a permanent magnet of a rotor in the permanent magnet type rotary electric machine according to Embodiment 1 of the present invention. It is a principal part cross-sectional view shown. In addition, a cross-sectional view is a cross-sectional view which shows the cross section orthogonal to the axial center of a rotor. 1 and 2 are illustrated with hatching omitted for convenience.

In FIG. 1, the permanent magnet type rotating electric machine 1 is composed of a stator 10 and a rotor 20.

The stator 10 is composed of a stator core 11 and a stator winding 15 mounted on the stator core 11. The stator core 11 is composed of an annular core back 12 and 36 teeth 13 formed on the core back 12. The 36 teeth 13 respectively protrude radially inward from the inner circumferential surface of the core back 12 and are arranged at equal angular pitches in the circumferential direction. The space formed between the adjacent teeth 13 is a slot 14. The stator winding 15 is composed of 36 concentrated winding coils 16 wound around each of the teeth 13. The stator winding 15 connects the concentrated winding coil 16 and is configured, for example, as a three-phase winding.

The rotor 20 is composed of a rotor core 21 fixed to a rotating shaft 22 inserted at an axial center position, and a permanent magnet 23 mounted on the rotor core 21. In the

rotor core

21, 24 magnet insertion holes 24 axially penetrating the outer peripheral portion of the rotor core 21 are formed at equal angular pitches in the circumferential direction. One permanent magnet 23 is inserted into each of the magnet insertion holes 24. The permanent magnets 23 arranged in the circumferential direction are magnetized such that the polarity on the outer circumferential side alternately becomes the N pole and the S pole in the circumferential direction. One permanent magnet 23 constitutes one magnetic pole. The rotor core 21 is manufactured by laminating and integrating magnetic pieces punched out of a magnetic thin plate such as a magnetic steel sheet.

The permanent magnet type rotary electric machine 1 has a rotor 20 coaxially and rotatably disposed with the stator 10 on the inner circumferential side of the stator 10 with a magnetic air gap between the stator 10 and the stator 10, Configured The permanent magnet type rotating electrical machine configured in this way is a rotating electrical machine of 24 poles and 36 slots, that is, a rotating electrical machine of 2-pole 3-slot series.

Here, the configuration of the main part of the rotor 20 will be described with reference to FIG.

The magnet insertion hole 24 is formed in a hole shape having a substantially rectangular cross section, and is disposed on the outer peripheral portion of the rotor core 21 with the long side of the rectangular cross section directed circumferentially. A pair of air gaps are formed so as to project from the magnet insertion hole 24 on both sides in the circumferential direction. This void portion becomes the flux barrier 25. The flux barrier 25 communicates with the magnet insertion hole 24 except for the portion on the inner diameter side of the short side of the rectangular cross section of the magnet insertion hole 24. The inner wall surface on the outer diameter side of the flux barrier 25 extends in the circumferential direction from the inner wall surface on the outer diameter side of the magnet insertion hole 24 and is formed in a gentle curved surface gradually displaced to the inner diameter side as it is separated from the magnet insertion hole 24 There is. The flux barrier 25 may be filled with varnish or the like in a state where the permanent magnet 23 is inserted into the magnet insertion hole 24.

The permanent magnet 23 is formed in a rectangular cross section equivalent to the magnet insertion hole 24. The permanent magnet 23 is accommodated in each of the magnet insertion holes 24 with its circumferential movement restricted by a portion on the inner diameter side of the short side of the rectangular cross section of the magnet insertion hole 24. The radial direction passing through the central position in the longitudinal direction of the long side of the rectangular cross section of the permanent magnet 23 is the d axis. Further, the radial direction passing through the center position between the d axes adjacent in the circumferential direction is the q axis. The d axis is a magnetic flux axis of the permanent magnet 23. The q-axis is an axis electrically and magnetically orthogonal to the d-axis.

A notch 26 for reducing torque ripple is formed on the q-axis with the groove direction as an axial direction by recessing the outer peripheral surface of the rotor core 21. The notch portion 26 is configured in a single R shape, that is, a groove shape in which circular arcs of a single radius of curvature are axially connected.

Here, the dimensional relationship of each part of the rotor core 21 will be described. A is the minimum iron width at the iron portion on the outer diameter side of the magnet insertion hole 24 and the flux barrier 25, B is the minimum iron width at the iron portion between the notch 26 and the flux barrier 25, C is the q axis The minimum iron width D in the iron portion between the flux barriers 25 opposed to each other across the surface is the circumferential width of the notch 26.

First, when pressing a magnetic thin plate such as a magnetic steel plate or the like, if C is smaller than twice the thickness of the magnetic thin plate, the punching accuracy is degraded. In order to ensure a good punching accuracy, it is desirable to make C be twice or more the thickness of the magnetic thin plate. In the first embodiment, C is twice the thickness of the magnetic thin plate. Thereby, the workability of the rotor core 21 is enhanced.

In

Patent Documents

1 and 2, the notch portion is formed in a complicated R shape. In the first embodiment, the notch portion 26 is formed in a single R shape, that is, a groove shape in which circular arcs of a single radius of curvature are axially connected. This facilitates dimensional inspection of the rotor core 21.

Next, results of analysis of stress generated when centrifugal force is applied to a rotor using a rotor core whose shape around q axis is changed are shown in FIG. 3 to FIG.

FIG. 3 shows that the centrifugal force is applied to the rotor using the rotor iron core 21A in which the cylindrical outer peripheral surface of the iron core and the outer diameter side wall surface of the flux barrier 25 are parallel while satisfying the relationship A> C. The results of analyzing the stress generated when In addition, the notch part 26 is not formed.

It was confirmed from FIG. 3 that when the outer peripheral surface of the rotor core 21A and the outer diameter side wall surface of the flux barrier 25 are parallel to each other, stress is concentrated in the vicinity of the corner on the q axis side of the flux barrier 25. In FIG. 3, the numbers indicate the portions where the principal stress is the highest, and indicate the numerical values of the principal stress based on the maximum value of the principal stress in FIG. 3.

FIG. 4 is a rotor in which the width of the iron portion between the cylindrical outer peripheral surface of the iron core and the outer diameter side wall surface of the flux barrier 25 becomes wider as it approaches the q axis while satisfying the relationship A> C. The result of analyzing the stress generated when centrifugal force is applied to the rotor using the iron core 21B is shown. In addition, the notch part 26 is not formed. A and C of the rotor core 21B were the same as A and C of the rotor core 21A used in the analysis of FIG.

In FIG. 4, the numbers indicate the portions where the principal stress is the highest, and indicate the numerical values of the principal stress based on the maximum value of the principal stress in FIG. 3. From FIG. 4, even if the minimum iron width A of the iron portion between the outer peripheral surface of rotor core 21B and the outer diameter side wall surface of flux barrier 25 is the same, rotor core 21B is relative to rotor core 21A. It was confirmed that the principal stress could be reduced by nearly 60%.

In the rotor core 21B used in the analysis of FIG. 4, FIG. 5 uses a rotor core 21C in which the amount of protrusion of the flux barrier 25 from the magnet insertion hole is reduced and the relationship A <C is satisfied. The results of analyzing the stress generated when centrifugal force is applied to the rotor are shown. In addition, the notch part 26 is not formed.

In FIG. 5, the numbers indicate the portions where the principal stress is the highest, and indicate the numerical values of the principal stress based on the maximum value of the principal stress in FIG. 3. From FIG. 5, even if the minimum iron width A of the iron portion between the outer peripheral surface of rotor core 21C and the outer diameter side wall surface of flux barrier 25 is the same, rotor core 21C is relative to rotor core 21A. It was confirmed that the principal stress could be reduced by nearly 50%. However, it was confirmed that the main stress of the rotor core 21C is increased with respect to the rotor core 21B. From this, it can be understood that in order to reduce the main stress acting on the flux barrier 25, the minimum iron width C between the flux barriers 25 adjacent in the circumferential direction may be made as narrow as possible within the processable range.

FIG. 6 shows that when a centrifugal force is applied to the rotor using the rotor core 21 in which the notches 26 are formed such that A <B in the rotor core 21B used in the analysis of FIG. 4. The results of analyzing the generated stress are shown.

In FIG. 6, the numbers indicate the portions where the principal stress is the highest, and indicate the numerical values of the principal stress based on the maximum value of the principal stress in FIG. 3. It was confirmed from FIG. 6 that the rotor core 21 can obtain a principal stress distribution equivalent to that of the rotor core 21B. Furthermore, it was confirmed from FIG. 6 that the rotor core 21 can reduce the principal stress with respect to the rotor core 21B.

According to the analysis results of FIGS. 3 to 6, when A <B is satisfied, when the notched portion 26 is provided on the q axis, compared with the case where the notched portion 26 is not provided, the rotor has a centrifugal force. It was found that the stress generated in the iron core can be reduced. That is, in the rotor core satisfying A <B, providing the notch 26 disperses the stress generated in the rotor core by the centrifugal force, and can reduce the peak value of the main stress and reduce the torque ripple. I understand. Furthermore, it was found that the principal stress acting on the flux barrier 25 can be further reduced if B> A> C is satisfied.

Next, in the rotating electrical machine on which the rotor used in the analysis of FIG. 3 is mounted, the results of analyzing the magnetic flux lines generated at the time of current conduction are shown in FIG. As shown in part P of FIG. 7, it was found that a part of the magnetic flux emitted from the teeth 13 flows in the circumferential direction without passing through the rotor core 21A, and interlinks with the adjacent teeth 13. This is because the outer peripheral surface of the rotor core 21A and the outer diameter side wall surface of the flux barrier 25 are parallel to each other, so that iron between the outer peripheral surface of the rotor core 21A and the outer diameter side wall surface of the flux barrier 25 It is presumed that the part is magnetically saturated by the magnetic flux of the permanent magnet 23 linking the iron part. That is, it is considered that the magnetic flux of the stator is hard to pass through the iron portion on the outer peripheral side of the flux barrier 25. Therefore, the magnetic flux of the stator passing through the portion P in FIG. 7 does not contribute to the torque and hardly contributes to the generation of the radial electromagnetic force in the teeth 13.

FIG. 8 shows the results of analysis of magnetic flux lines generated at the time of current application in the rotating electrical machine on which the rotor used in the analysis of FIG. 4 is mounted. As shown in part P of FIG. 8, it was found that a part of the magnetic flux coming out of the teeth 13 interlinks with the adjacent teeth 13 through the surface on the q axis of the rotor core 21B. This is because the outer peripheral surface of the rotor core 21B and the outer diameter side wall surface of the flux barrier 25 are not parallel to each other, so that the space between the outer peripheral surface of the rotor core 21B and the outer diameter side wall of the flux barrier 25 is It is presumed that only the minimum iron width portion of the iron portion is magnetically saturated by the magnetic flux of the permanent magnet 23 linking the iron portion. That is, it is considered that the magnetic flux of the stator is likely to pass through the iron portion on the outer peripheral side of the flux barrier 25. Therefore, the magnetic flux of the stator passing through the P portion in FIG. 8 does not contribute to the torque because it links only a part of the surface of the rotor core 21B. However, since the magnetic flux of the stator passing through the portion P in FIG. 8 passes the teeth 13 in the radial direction, a radial electromagnetic force is generated in the teeth 13.

FIG. 9 shows the result of analyzing the magnetic flux lines generated at the time of current application in the rotating electrical machine on which the rotor used in the analysis of FIG. 6 is mounted. As shown in part P of FIG. 9, it was found that a part of the magnetic flux emitted from the teeth 13 interlinks with the adjacent teeth 13 without passing through the rotor core 21. In this electric rotating machine, although the outer peripheral surface of the rotor core 21 and the outer diameter side wall surface of the flux barrier 25 are not parallel, the notch 26 is provided on the q-axis. As a result, the magnetic air gap between the stator and the rotor on the q axis is expanded, and the magnetic flux of the stator is the iron portion between the outer peripheral surface of the rotor core 21 and the outer diameter side wall surface of the flux barrier 25. It is thought that it is difficult to pass through. Therefore, the magnetic flux of the stator passing through the portion P in FIG. 9 does not contribute to the torque, and the radial electromagnetic force generated in the teeth 13 can be reduced.

From the analysis results of FIG. 7 to FIG. 9, by providing the notch 26 on the q axis, the magnetic flux of the stator passing only the surface on the q axis of the rotor core 21 is eliminated and the radial direction generated in the teeth 13 It can be seen that the electromagnetic force can be reduced.

FIG. 10 is a diagram showing the result of analyzing the radial electromagnetic force generated in the teeth by changing the minimum iron width C of the rotor core. In FIG. 10, the horizontal axis is D / C, and the vertical axis is radial electromagnetic force (sixth component) generated in the teeth. Each line shows radial electromagnetic force generated on the teeth when C is made constant and D is changed. Moreover, C is changing for every line.

In general, in a rotating electrical machine, an electromagnetic excitation force is generated in a magnetic gap between a stator and a rotor. The electromagnetic excitation force generates a radial electromagnetic force in teeth of a stator. . The radial electromagnetic force vibrates the stator, structural members around the stator, and the like to generate noise. In the teeth of the stator, radial direction electromagnetic forces of various time components, for example, radial direction electromagnetic force whose deformation mode of the stator is zero order and whose sixth order time component is generated. In the concentrated winding permanent magnet type rotary electric machine of 2 pole 3 slot series, it is known that the influence of the direction of the radial direction of the deformation mode is particularly large and the time component is 6 order is large.

From FIG. 10, it was found that when C is fixed and D is increased, the radial electromagnetic force generated in the teeth decreases. Then, in a region where D / C is 1 or less, as the value of D / C increases, the radial electromagnetic force generated in the teeth decreases significantly, and when D / C exceeds 1, the value of D / C becomes As the radial direction electromagnetic force generated in the teeth gradually decreases as it becomes larger and the D / C becomes 1.6 or more, the radial direction electromagnetic force generated in the teeth is almost independent of the value of the D / C. It turned out to be constant.

From this, by determining one of C and D and determining the other so as to satisfy C <D, it is possible to reduce the radial electromagnetic force (sixth component) generated in the teeth. Furthermore, by determining C and D so as to satisfy D / C ≧ 1.6, the radial electromagnetic force (sixth component) generated in the teeth can be further reduced. As described above, even if the notch 26 is provided on the q axis, when C and D are set to satisfy D / C ≦ 1, the reduction amount of the radial electromagnetic force generated in the teeth is small. Vibration and noise can not be effectively suppressed. Therefore, in order to significantly reduce the radial electromagnetic force generated in the teeth and to effectively suppress the generation of vibration and noise, C and D should be set to satisfy C <D, D / C. It is more preferable to set C and D so as to satisfy ≧ 1.6.

Second Embodiment
FIG. 11 is a cross-sectional view showing a permanent magnet type rotary electric machine according to Embodiment 2 of the present invention, and FIG. 12 is a view around a permanent magnet of a rotor in a permanent magnet type rotary electric machine according to Embodiment 2 of the present invention. It is a principal part cross-sectional view shown. 11 and 12 are illustrated with hatching omitted for the sake of convenience.

In FIG. 11, the permanent magnet type rotating electrical machine 1A is configured of a stator 10 and a rotor 20A. That is, the permanent magnet type rotary electric machine 1A is configured the same as the permanent magnet type rotary electric machine 1 of the first embodiment except that the rotor 20A is used instead of the rotor 20.

Here, the configuration of the main part of the rotor 20A will be described with reference to FIG.

The rotor 20A is composed of a rotor core 21A fixed to the rotating shaft 22 inserted at the axial center position, and a permanent magnet 23A mounted on the rotor core 21A. In the rotor core 21A, a magnet insertion hole 24A having a substantially rectangular cross section, which penetrates the outer peripheral portion of the rotor core 21A in the axial direction, is convex toward the axis of the rotary shaft 22, and the outer periphery of the rotor core 21A Twenty-four pairs of magnet insertion holes 24A arranged in a V shape extending toward the surface are formed at equal angular pitches in the circumferential direction. One permanent magnet 23A having a substantially rectangular cross section is inserted into each of the magnet insertion holes 24A. The pair of permanent magnets 23 inserted into the pair of magnet insertion holes 24A is magnetized so that the opposite surfaces, ie, the surfaces on the outer peripheral side, have the same polarity. The 24 pairs of permanent magnets 23A arranged in the circumferential direction are arranged so that the polarities on the outer circumferential side alternately become the N pole and the S pole in the circumferential direction for each pair. The rotor core 21A is manufactured by laminating and integrating magnetic pieces punched out of a magnetic thin plate such as a magnetic steel sheet.

A pair of air gaps are formed to project from the magnet insertion holes 24A on both sides in the circumferential direction. These void portions become flux barriers 25Aa and 25Ab. The flux barriers 25Aa and 25Ab communicate with the magnet insertion hole 24A except for the portion on the inner diameter side of the short side of the rectangular cross section of the magnet insertion hole 24A. The inner wall surface on the outer diameter side of the flux barrier 25Aa communicating with the outer diameter side of the magnet insertion hole 24A extends circumferentially from the inner wall surface on the outer diameter side of the magnet insertion hole 24A, and gradually changes in inner diameter as it separates from the magnet insertion hole 24A. It is formed in a gentle curved surface that is displaced to the side. The flux barriers 25Aa and 25Ab may be filled with varnish or the like in a state in which the permanent magnet 23A is inserted into the magnet insertion hole 24A.

The permanent magnet 23A is accommodated in each of the magnet insertion holes 24A with its movement in the circumferential direction being restricted by the portion on the inner diameter side of the short side of the rectangular cross section of the magnet insertion hole 24A. The pair of permanent magnets 23A inserted in the pair of magnet insertion holes 24A constitutes one magnetic pole. The permanent magnet 23A constituting one magnetic pole, the magnet insertion holes 24A, and the flux barriers 25Aa, 25Ab pass through the circumferential center position between the pair of magnet insertion holes 24A, and a plane including the axial center of the rotation shaft 22 is a plane of symmetry. It is configured to be in plane symmetry. The radial direction in this plane of symmetry is the d axis. Further, the radial direction passing through the center position between the d axes adjacent in the circumferential direction is the q axis.

A notch 26 for reducing torque ripple is disposed on the q-axis with the groove direction as an axial direction by recessing the outer peripheral surface of the rotor core 21A. The notch 26 is configured in a single R shape.

Here, A is the minimum iron width in the iron portion on the outer diameter side of the magnet insertion hole 24A and the flux barrier 25Aa, B is the minimum iron width in the iron portion between the notch 26 and the flux barrier 25Aa, and C is , The minimum iron width in the iron portion between the flux barriers 25Aa facing each other across the q-axis, D is the circumferential width of the notch 26. (I think that it would be easier to shift the position of "B" in Fig. 12 a little higher)

In the second embodiment, the rotor core 21A is manufactured so as to satisfy the relationship of A <B, C <D, and A <C. Further, C is twice as large as the thickness of the magnetic thin plate constituting the rotor core 21A.
Therefore, also in the second embodiment, the same effect as that of the first embodiment can be obtained.

In each of the above embodiments, the concentrated winding permanent magnet type rotating electrical machine of 24 poles and 36 slots is used, but in the case of a concentrated pole permanent magnet type rotating electrical machine of 2-pole 3-slot series, the number of poles is equal to the number of slots. It is not limited to.

In each of the above embodiments, although the concentrated winding permanent magnet type rotating electrical machine of 2 pole 3-slot series is used, the same effect can be obtained by using the concentrated winding permanent magnet type rotating electrical machine of 4 pole 3 slot series. Play.

Reference Signs List 10 stator, 11 stator core, 12 core back, 13 teeth, shaft, 14 slots, 15 stator winding, 16 concentrated winding coils, 20, 20 A rotor, 21, 21 A rotor core, 23, 23 A permanent magnet 24, 24A Magnet insertion holes 25, 25Aa, 25Ab Flux barrier, 26 Notches.

Claims

A plurality of teeth radially protruding from an annular core back and arranged in a circumferential direction, and a stator core formed between the teeth adjacent in the circumferential direction and a stator mounted on the stator core A stator having a winding,
A plurality of annular rotor cores coaxially and rotatably disposed on the inner circumferential side of the stator via the stator and the magnetic gap, and a plurality of circumferentially arranged on the rotor core And a rotor having a permanent magnet forming a magnetic pole, in a permanent magnet type rotating electric machine,
A magnet insertion hole formed to penetrate the rotor core in the axial direction and into which the permanent magnet is inserted;
A flux barrier that protrudes circumferentially on both sides from the magnet insertion hole and is formed to penetrate the rotor core in the axial direction;
And a notch formed on the q-axis of the outer peripheral surface of the rotor core so as to extend from one end to the other end in the axial direction,
The permanent magnet type rotary electric machine in which C and D satisfy the relationship of C <D, where C is the minimum iron width in the q-axis and D is the circumferential width of the notch.
The permanent magnet type rotary electric machine according to claim 1, wherein C and D satisfy the relationship of D / C ≧ 1.6.
Assuming that the minimum iron width on the outer diameter side of the magnet insertion hole and the flux barrier is A, and the minimum iron width between the flux barrier and the notch is B, A and B satisfy A <B. The permanent magnet type rotary electric machine according to claim 1 or 2, which satisfies the following relationship.
The permanent magnet type rotary electric machine according to claim 3, wherein A and C satisfy a relationship of A> C.
The two-pole three-slot series or the four-pole three-slot series according to any one of claims 1 to 4, wherein the stator winding is constituted by a concentrated winding coil attached to each of the teeth. Permanent magnet type rotating electrical machine.
The permanent magnet type rotary electric machine according to any one of claims 1 to 5, wherein the notch portion has a groove shape in which circular arcs of a single radius of curvature are connected in the axial direction.
The rotor core is a laminate of magnetic thin plates,
The permanent magnet type rotary electric machine according to any one of claims 1 to 6, wherein the C is at least twice the thickness of the magnetic thin plate.