JP2016144235A - Rotary electric machine and electrically-driven power steering device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotary electric machine capable of improving torque by improving rigidity of a stator core and reducing a leakage magnetic flux even while preventing permanent magnets that are embedded in a rotor core from jumping out.SOLUTION: In the rotary electric machine, a stator and a rotor are disposed. The stator includes a stator core 3 that is formed by laminating a plurality of core sheets 16, and an armature coil 2. The rotor includes a rotor core 11 that is formed by laminating a plurality of magnetic pole units 19, and permanent magnets 12 that are embedded in the rotor core 11. At least one of the core sheets 16 includes a coupling part 14b that couples distal ends of neighboring teeth closer to the rotor. At least one of the magnetic pole units 19 includes a magnet holding part 20 that holds the permanent magnets 12 at a stator side. On at least any partial cross section in an axial direction of the rotary electric machine, only either the coupling part 14b or the magnet holding part 20 is present.SELECTED DRAWING: Figure 3

Description

  In this invention, the stator has a structure in which the tips of adjacent teeth are connected by a connecting portion, and the rotor employs a rotating electrical machine having a structure in which a permanent magnet is embedded in the rotor core and the rotating electrical machine. The present invention relates to an electric power steering apparatus.

  The stator is a structure in which adjacent teeth of the stator core are connected by a connecting portion of a magnetic body to increase rigidity, and the rotor is an embedded magnet structure, holds a magnet, and There is a rotating electrical machine having a magnet holding portion facing a stator and capable of holding a magnet (see, for example, Patent Document 1). Further, the stator is configured by laminating a core sheet having a connecting portion and a core sheet having no connecting portion in order to reduce torque ripple caused by distortion of an induced voltage waveform due to leakage magnetic flux generated in the connecting portion. The rotor has a surface magnet structure in which a magnet is attached to the surface of the rotor core (see, for example, Patent Document 2), the stator does not have a connecting portion, and the rotor has an embedded magnet structure. In order to reduce the leakage magnetic flux and obtain a high torque, the magnet holding part that faces the stator is mixed with a part where there is no part in the axial direction (for example, patent document) 3), the stator does not have a connecting portion, and the rotor has a pole shoe that holds a magnet and faces the stator (for example, Patent Document 4).

JP 2009-77469 A JP 2007-151232 A JP 2006-109683 A Japanese Patent Laid-Open No. 10-164807

However, in the thing of patent document 1, since all the core sheets which comprise a stator have a teeth front-end | tip connection part, and all the core sheets which comprise a rotor have a magnet holding part which hold | maintains a magnet, a stator There is a problem that the leakage magnetic flux generated at the connecting portion of the rotor and the magnet holding portion of the rotor is increased, and the torque obtained by the rotating electrical machine is reduced.
Moreover, in the thing of patent document 2, since the rotor was a surface magnet structure, there existed a subject that it was difficult to obtain reluctance torque and to obtain high torque.
Moreover, in the thing of patent document 3, the stator is comprised only with the core sheet | seat which does not have a connection part, the intensity | strength of the inner periphery by the side of the rotor of a stator core is low, and it is cogging by the opening part of a slot. There is a problem that the harmonic component of slot permeance that causes torque and electromagnetic excitation force increases, causing vibration and noise.
Moreover, in the thing of patent document 4, a stator does not have a connection part, but is comprised from the core sheet | seat which has a collar part at the front-end | tip of teeth, and the core sheet which does not have a collar part, The rotor of a stator core There was a problem that the strength of the inner circumference on the side was low, causing vibration and noise.

  This invention has been made to solve the above-mentioned problems, and while increasing the rigidity of the stator and preventing the permanent magnets embedded in the rotor core from popping out, it reduces leakage magnetic flux, An object of the present invention is to obtain a rotating electrical machine capable of improving torque.

  A rotating electrical machine according to the present invention includes a stator core configured by laminating a plurality of core sheets including a plurality of teeth in the axial direction, and a stator having an armature winding wound around the teeth, A rotor core formed by laminating a plurality of magnetic pole unit units each including a magnetic pole part and a plurality of permanent magnet embedded parts in the axial direction, and a rotor having a permanent magnet embedded in the embedded part have magnetic gaps. At least one of the core sheets has a connecting portion for connecting the rotor-side tips of adjacent teeth, and at least one of the magnetic pole unit is And a magnet holding portion for holding the permanent magnet on the stator side, and in a cross section of the stator core and the rotor core, the stator core and the rotor core In at least one part of the cross section in the direction, in which are configured to only one of the connecting portion and the magnet holder is present.

  The rotating electrical machine according to the present invention is configured such that only one of the coupling portion and the magnet holding portion is present in at least some of the cross section in the axial direction of the stator core and the rotor core. As a result, the leakage magnetic flux generated at the stator connection and the rotor magnet holder can be reduced, increasing the rigidity of the stator and holding down the permanent magnet embedded in the rotor core. However, torque can be improved.

It is explanatory drawing of the electric drive device which incorporates and applies the rotary electric machine by each Embodiment 1-7. FIG. 3 is a cross-sectional view showing the configuration of the rotating electrical machine in the first embodiment. FIG. 3 is a longitudinal sectional view taken along line III-III in FIG. 3 is a plan view showing a core sheet having a connecting portion in Embodiment 1. FIG. FIG. 3 is a plan view showing a core sheet that does not have a connecting portion in the first embodiment. FIG. 3 is a transverse sectional view showing a magnetic pole unit having a magnet holding part and a permanent magnet in the first embodiment. FIG. 3 is a transverse sectional view showing a magnetic pole unit having a magnet holding part and a permanent magnet in the first embodiment. It is a cross-sectional view which shows the magnetic pole part unit and permanent magnet which do not have the magnet holding part in Embodiment 1. FIG. 3 is a transverse sectional view showing a first section of the rotating electrical machine in the first embodiment. FIG. 3 is a transverse cross sectional view showing a second cross section of the rotating electrical machine in the first embodiment. FIG. 4 is a transverse cross sectional view showing a third cross section of the rotating electrical machine in the first embodiment. FIG. 6 is a transverse sectional view showing a fourth section of the rotating electrical machine in the first embodiment. It is a figure which shows the ratio of the ratio of the lamination direction length of the 2nd cross section and the 3rd cross section of the rotary electric machine in Embodiment 1, and an average torque. It is a diagram which shows the ratio of the ratio of the lamination direction length of the 2nd cross section and 3rd cross section of the rotary electric machine in Embodiment 1, and a torque ripple. FIG. 3 is a longitudinal sectional view showing the configuration of the rotating electrical machine in the first embodiment. FIG. 3 is a cross-sectional view showing the configuration of the rotating electrical machine in the first embodiment. FIG. 5 is a longitudinal sectional view showing a configuration of a rotating electrical machine in a second embodiment. FIG. 10 is a transverse cross-sectional view showing a configuration of a rotating electrical machine in a third embodiment. It is a cross-sectional view which shows the magnetic pole part unit and permanent magnet which have a magnet holding part in Embodiment 3. It is a cross-sectional view which shows the magnetic pole part unit and permanent magnet which do not have the magnet holding part in Embodiment 3. FIG. 10 is a transverse sectional view showing the configuration of a rotating electrical machine in a fourth embodiment. FIG. 6 is a cross sectional view showing a configuration of a rotor in a fourth embodiment. FIG. 10 is a cross-sectional view showing a configuration of a rotating electrical machine in a fifth embodiment. FIG. 10 is a connection diagram of a rotary electric machine and an ECU circuit in a sixth embodiment. FIG. 10 is an explanatory diagram relating to an electric power steering device for an automobile in a seventh embodiment.

  Hereinafter, the rotating electrical machine according to each embodiment of the present invention will be described with reference to the drawings. In each embodiment, the same or equivalent members and parts will be described with the same reference numerals.

Embodiment 1 FIG.
A first embodiment of the present invention will be described with reference to FIGS.
(Description of electric drive device)
FIG. 1 is a cross-sectional view showing an electric drive device in which a rotating electrical machine and an ECU (Electronic Control Unit) are integrated.
First, the rotating electrical machine will be described. A rotating electrical machine 100 includes a stator core 3 formed by stacking magnetic core sheets 16 such as electromagnetic steel plates, a stator 1 having an armature winding 2 housed in the stator core 3, and the stator 1 The frame 4 is fixed. Further, the frame 4 is fixed by a housing 5 and a bolt 6 provided on the front surface portion of the rotating electrical machine 100. A bearing 7 is provided in the housing 5, and the bearing 7 supports the shaft 9 in cooperation with the bearing 8 and is rotatable. The bearing 8 is supported by a wall portion 4 a provided integrally with the frame 4 or separately. The rotor 10 includes a shaft 9, a rotor core 11, a permanent magnet 12, and the like. The rotor core 11 is press-fitted into the shaft 9, and the permanent magnet 12 is embedded in the rotor core 11.

(Explanation of sectional view of rotating electrical machine)
FIG. 2 is a kind of cross-sectional view showing the configuration of the rotating electrical machine in the first embodiment for carrying out the present invention.
In this rotating electrical machine 100, the number of poles of the rotor 10 is 14, the number of slots of the stator 1 is 18, and the rotor 10 is provided inside the stator 1 so as to be rotatable.
The stator 1 includes a core back 13 and 18 teeth T1 to T18 which are arranged at equal intervals and project from the core back 13 in the direction of the magnetic gap length, and 18 teeth provided between the teeth 14. The stator core 3 is formed by laminating a plurality of core sheets 16 made of a magnetic material in which the slots 15 are formed, and the armature coil 2a accommodated in 18 slots of the stator core 3. . The teeth 14 of the stator core 3 are each provided with a flange 14a projecting from the teeth 14 in the circumferential direction at the tip of the rotor 10 side in the direction of the magnetic gap length, and constitute the stator core 3. At least one of the core sheets 16 to be provided has a connecting portion 14b in which the adjacent flange portions 14a are connected by a magnetic material as shown in FIG.

  A radial force that tends to distort the inner periphery of the stator 1 acts on the inner periphery of the stator 1. By connecting the flanges 14 a in this manner, the rotor core 10 side of the stator core 3 is connected. Thus, it is possible to improve the strength of the inner circumference of the rotor and reduce the vibration of the rotating electrical machine, and to prevent the armature winding 2a from jumping out of the stator core 3. In addition, when the adjacent flanges 14a are connected in this way, the slot-side opening on the rotor 10 side is eliminated, so that the harmonic component of slot permeance that causes cogging torque and electromagnetic excitation force can be reduced. Cogging torque and electromagnetic excitation force can be reduced. Further, as described above, by connecting the flange portions 14a, the connecting portion 14b becomes a path of magnetic flux, and the inductance Ld of the rotor d-axis is increased, so that the effect of field weakening control can be strengthened, and voltage saturation is reduced. Since it can relieve, the effect that the average torque at the time of high rotation of a rotary electric machine can be improved is acquired.

  The armature coil 2a is connected for each phase, and further connected externally, whereby the armature winding 2 is configured. The armature coil 2a has six U phases: + U11, -U12, + U13, -U21, + U22, and -U23, V phases are + V11, -V12, + V13, -V21, + V22, and -V23, and W phases. Is formed by connecting six pieces of -W11, + W12, -W13, + W21, -W22, and + W23, respectively. As shown in FIG. 2, each coil 2a corresponds to each of the teeth T1 to T18, + U11, + V11, -V12, -W11, -U12, + U13, + V13, + W12, -W13, -U21, -V21, + V22, + W21, + U22, -U23, -V23, -W22, + W23 . However, “+” and “−” indicate the winding polarity of the coil, and “+” and “−” have opposite winding polarities. The 18 armature coils 2a are connected for each phase, and further connected externally to constitute the armature winding 2.

The rotor 10 is disposed with a stator 1 and a magnetic gap, and both ends are provided by a first bearing 7 having a rotor core 11 fitted to the housing 5 and a second bearing 8 fitted to the frame 4. The part is fixed to a shaft 9 that is rotatably supported, and 14 permanent magnets 12 are embedded in the rotor core 11 at equal intervals in the circumferential direction.
The rotor core 11 is composed of a magnetic pole unit 19 in which magnetic pole parts 17 made of the same number of magnetic bodies as the number of poles of the permanent magnet 12 are integrated via a bridge part 18 on the same plane. Since the bridge portion 18 is fixed to the shaft 9, the rotation of the rotor 10 is propagated to the shaft 9 via the bridge portion 18. The magnetic pole portions 17 are arranged at equal intervals in the circumferential direction, and permanent magnet embedded portions 12 a are provided between adjacent magnetic pole portions 17. In addition, at least one of the magnetic pole part units 19 constituting the rotor core 11 has the magnetic pole part 17 constituting the magnetic pole part unit 19 holding the permanent magnet 12 and facing the stator 1. It has the magnet holding | maintenance part 20 which consists of a magnetic body. The hole 21 is normally a space, but may be filled with SUS, resin, or the like.
Here, in the magnetic pole unit 19, the same number of magnetic pole parts 17 as the permanent magnets 12 are integrated by the bridge part 18, but there is no bridge part 18 and the magnetic pole part 17 is not integrated. Also good.
Fourteen permanent magnets 12 are embedded at equal intervals in the circumferential direction in a permanent magnet embedded portion 12 a provided in the rotor core 11. When the rotating electrical machine rotates, a centrifugal force acts on the permanent magnet 12 in the radial direction and tries to jump out of the rotor core 11. However, by providing the magnet holder 20 on the rotor core 11, the magnet holder 20 becomes permanent. The effect of holding down the magnet 12 and suppressing centrifugal force is obtained.

(Explanation of III-III cross section of rotating electrical machine)
3 is a cross-sectional view taken along line III-III shown in FIG. 2, of the rotating electrical machine according to Embodiment 1 for carrying out the present invention. FIG. 3A shows the entire longitudinal section of the stator 1 and the rotor 10, and FIG. 3B shows some details thereof.
The stator core 3 is configured by stacking a core sheet 16A (shown in FIG. 4) having a connecting portion 14b and a core sheet 16B (shown in FIG. 5) having no connecting portion 14b. The core sheets 16A having the cores 16B and the core sheets 16B having no connecting portions 14b are alternately arranged. The rotor core 11 is configured by stacking a magnetic pole unit 19A (shown in FIG. 7) having a magnet holding part 20 and a magnetic pole part unit 19B (shown in FIG. 8) not having the magnet holding part 20. .
For this reason, as shown in FIG.3 (b), as for a rotary electric machine, the stator 1 has the connection part 14b, and the rotor 10 has the cross section which has the magnet holding | maintenance part 20: SC1-SC1 (it is set as 1st cross section). ), The stator 1 has a connecting part 14b, the rotor 10 has a cross section without the magnet holding part 20: SC2-SC2 (second cross section), and the stator 1 does not have the connecting part 14b. The rotor 10 has a magnet holding part 20 in cross section: SC3-SC3 (assumed as a third cross section), the stator 1 does not have a connecting part 14b, and the rotor 10 does not have a magnet holding part 20. : SC4-SC4 (fourth cross section), and between the coupling portion 14b of the stator 1 adjacent to the axial direction and the magnet holding portion 20 of the rotor 10, the axial magnetic flux Φ Occurs.
(1) First section: SC1-SC1
The core sheet 16 of the stator core 3 constituting the stator 1 has a connecting portion 14b and has a magnet holding portion 20 in the magnetic pole portion unit 19 constituting the rotor 10: SC1-SC1 (first cross section) Is the axial direction of the accumulation region SR11 having an axial length equal to the thickness in the accumulation direction corresponding to one core sheet 16 and equal to the thickness in the accumulation direction corresponding to one magnetic pole unit 19 Exists throughout.
(2) Second section: SC2-SC2
The core sheet 16 of the stator core 3 constituting the stator 1 has a connecting part 14b, and a cross section without the magnet holding part 20 in the magnetic pole part unit 19 constituting the rotor 10: SC2-SC2 (second (Cross section) of the integrated region SR12 having an axial length equal to the thickness in the integration direction corresponding to one core sheet 16 and equal to the thickness in the integration direction corresponding to one magnetic pole unit 19 Exists across the entire axial direction.
(3) Third section: SC3-SC3
The core sheet 16 of the stator core 3 constituting the stator 1 does not have the connecting part 14b, and has a magnet holding part 20 in the magnetic pole part unit 19 constituting the rotor 10: SC3-SC3 (third section ) Is the axis of the integrated region SR13 having an axial length equal to the thickness in the integration direction corresponding to one core sheet 16 and equal to the thickness in the integration direction corresponding to one magnetic pole unit 19. Exists across the entire direction.
(4) Fourth section: SC4-SC4
The core sheet 16 of the stator core 3 constituting the stator 1 does not have the connecting part 14b, and the magnetic pole part unit 19 constituting the rotor 10 does not have the magnet holding part 20: SC4-SC4 (fourth) The cross-section of the integrated region SR14 has a length in the axial direction equal to the thickness in the integration direction corresponding to one core sheet 16 and equal to the thickness in the integration direction corresponding to one magnetic pole unit 19. It exists over the entire axial direction.
The stator core 3 of the stator 1 and the rotor core 11 of the rotor 10 constituting the rotating electrical machine are each integrated regions SR11-14 having any one of the four types of cross sections shown in the above (1) to (4). These regions exist in a mixed laminated state over the entire axial direction shown as the axial length L in FIG.

(Description of the structure of the stator core of the rotating electrical machine)
FIG. 4 is a plan view showing a stator core sheet 16A having a connecting portion 14b in which adjacent flange portions 14a are connected by a magnetic connecting portion 14b.
Since all the adjacent flange portions 14a are connected by the magnetic connecting portion 14b, the strength of the inner periphery of the stator core 3 on the rotor 10 side can be improved, and the vibration of the rotating electrical machine can be reduced. An effect of preventing the armature winding 2 from protruding from the stator core 3 can be obtained. On the other hand, when the connecting portion 14b becomes a magnetic flux path, a leakage magnetic flux Φ is generated, and the gap magnetic flux between the stator 1 and the rotor 10 is reduced, which causes a decrease in torque by the rotating electrical machine.
Here, the core sheet 16A having the connecting portions 14b has the connecting portions 14b between all the adjacent flange portions 14a, but the connecting portions 14b may not be between all the flange portions 14a. With such a configuration, the number of connecting portions 14b can be reduced and the leakage magnetic flux Φ can be reduced, so that an effect that the torque can be improved is obtained.
FIG. 5 is a plan view showing a stator core sheet 16 </ b> B that does not have the connecting portions 14 b and that has the opening portions 14 c that are not connected to the adjacent flange portions 14 a.
Since the stator core sheet 16B without the connecting portion 14b does not have the connecting portion 14b, the connecting portion 14b of the stator core sheet 16 having the connecting portion 14b does not generate a leakage magnetic flux, Torque can be improved.

The stator core 3 in the present embodiment is configured by laminating a core sheet 16A having a connecting portion 14b and a core sheet 16B having no connecting portion 14b. For this reason, the strength of the inner periphery of the stator core 3 on the rotor 10 side is improved to reduce vibration of the rotating electric machine, and further, while preventing the armature winding 2 from protruding from the stator core 3, The effect of reducing the leakage magnetic flux Φ generated in the portion 14b and improving the torque is obtained.
Further, since the stator core sheets 16A and 16B are laminated via caulking having a V-shaped cross section, the stator core sheets 16A and 16B do not rotate, and a stator core having a high roundness is formed. Since it can be manufactured, the cogging torque is difficult to increase.

(Description of configuration of rotor core of rotating electrical machine)
FIG. 6 (a) shows a magnetic pole part 17 </ b> A having a magnet holding part 20 and a permanent magnet 12 that has a magnet holding part 20 that holds the permanent magnet 12 and faces the stator 1. FIG. 6B shows the magnetic pole unit 19A having the magnet holding part 20 and the permanent magnet 12 provided with the same number of the magnetic pole parts 17A having the magnet holding part 20 as the permanent magnets 12 on the same plane. .
The same number of magnetic pole portions 17 </ b> A as the permanent magnets 12 have magnet holding portions 20 that protrude from the outer diameter side edge portion along the outer diameter side surface of the permanent magnet 12 to both sides in the circumferential direction. It restricts movement in the direction.
As shown in FIG. 6A, centrifugal force acts on the permanent magnet 12 during the rotating operation of the rotating electrical machine, but in the magnetic pole portion 17 </ b> A having the magnet holding portion 20, the force F <b> 1 that the magnet holding portion 20 presses the permanent magnet 12. Acts as a reaction force of the centrifugal force F2, so that the permanent magnet 12 can be prevented from jumping out of the rotor core 11.
On the other hand, when the magnet holding portion 20 becomes a magnetic flux path, a leakage magnetic flux Φ is generated, and the magnetic flux in the gap between the stator 1 and the rotor 10 is reduced, which causes a reduction in torque.
In FIGS. 6A and 6B, a gap is provided between the magnet holding portions 20 provided in the adjacent magnetic pole portions 17A. However, as illustrated in FIG. The magnet holding part 20 provided in 17A may be connected. With this structure, the force with which the magnet holding unit 20 holds the permanent magnet 12 is further increased, and the strength of the rotor core 11 is improved. Further, since the number of parts constituting the rotor core 11 is small, it is possible to obtain an effect of reducing the manufacturing cost and simplifying the manufacturing.
FIG. 8A shows the magnetic pole part 17B without the magnet holding part 20 and the permanent magnet 12, and FIG. 8B shows the same magnetic pole part 17B without the magnet holding part 20. The magnetic pole part unit 19B and the permanent magnet 12 which do not have the connection part 14b provided with the same number as the permanent magnet 12 on the plane are shown. The magnetic pole portion 17B that does not have the connecting portion 14b can improve the torque because the leakage flux Φ in which the magnet holding portion 20 serves as a magnetic flux path does not occur.
The rotor core 11 in the present embodiment is configured by laminating a magnetic pole part unit 19A having a magnet holding part 20 and a magnetic pole part unit 19B having no magnet holding part 20. For this reason, it is possible to obtain an effect of reducing the leakage magnetic flux Φ and improving the torque while pressing the permanent magnet 12.

(Description of four types of cross sections of rotating electrical machines)
FIG. 9A is a first cross-sectional view of the rotating electrical machine according to Embodiment 1 for carrying out the present invention, FIG. 9B is an enlarged view of a main part of the first cross-section, and FIG. These are the 2nd sectional views of the rotary electric machine in Embodiment 1 for carrying out the present invention, FIG.10 (b) is the principal part enlarged view of the 2nd section, and Fig.11 (a) shows the present invention. FIG. 11B is an enlarged view of a main part of the third cross section, and FIG. 12A is an implementation for carrying out the present invention. The 4th sectional view of the rotary electric machine in form 1 of Drawing 1, and Drawing 12 (b) are the principal part enlarged views of the 4th section.
(1) First section: SC1-SC1
As shown to Fig.9 (a), the stator core 3 which comprises 1st cross section: SC1-SC1 (refer FIG. 3) is connected between the adjacent collar parts 14a with the connection part 14b of a magnetic body. The core sheet 16A having the connecting portion 14b is provided. Further, the rotor core 11 constituting the first cross section: SC1-SC1 holds the permanent magnet 12 and the magnetic pole part 17A having the magnet holding part 20 facing the stator 1 on the same plane. The magnetic pole unit 19 </ b> A having the magnet holding unit 20 and having the same number of poles as the magnet 12 is provided.
In the first cross section: SC1-SC1, the core sheet 16 of the stator core 3 constituting the stator 1 has a connecting part 14b, and the magnetic pole part unit 19A constituting the rotor 10 has a magnet holding part 20. Therefore, the strength of the inner periphery of the stator core 3 on the rotor 10 side is improved, the vibration of the rotating electrical machine is reduced, the armature winding 2 is prevented from jumping out of the stator core 3, and the permanent An effect is obtained that the magnet 12 can be prevented from jumping out of the rotor core 11 by centrifugal force. On the other hand, there is a problem that a leakage flux Φ is generated between the connecting portion 14 b of the stator 1 and the magnet holding portion 20 of the rotor 10.
(2) Second section: SC2-SC2
As shown in FIG. 10A, in the stator core 3 constituting the second cross section: SC2-SC2 (see FIG. 3), the adjacent flange portions 14a are connected by a connecting portion 14b made of a magnetic material. The core sheet 16A having the connecting portion 14b is provided. In addition, the rotor core 11 constituting the second cross section: SC2-SC2 has the magnet holding part 20 provided with the same number of magnetic pole parts 17B not having the magnet holding part 20 as the permanent magnets 12 on the same plane. A magnetic pole unit 19B is provided.
In the second cross section: SC2-SC2, the core sheet 16A of the stator core 3 constituting the stator 1 has a connecting part 14b, and the magnetic pole part unit 19B constituting the rotor 10 has a magnet holding part 20. Therefore, the strength of the inner periphery of the stator core 3 on the rotor 10 side is improved, the vibration of the rotating electrical machine is reduced, and the armature winding 2 is prevented from jumping out of the stator core 3. The effect is obtained that the leakage magnetic flux Φ generated between the magnet holding part 20 of the rotor 10, the connecting part 14b of the stator 1 and the magnet holding part 20 of the rotor 10 can be reduced, and the torque can be improved. .
(3) Third section: SC3-SC3
As shown in FIG. 11A, in the stator core 3 constituting the third cross section: SC3-SC3 (see FIG. 3), the adjacent flange portions 14a are not connected by a connecting portion 14b of a magnetic material. The core sheet 16B does not have the connecting portion 14b. Further, the rotor core 3 constituting the third cross section: SC3-SC3 has the magnetic pole part having the magnet holding part 20 provided with the same number of the magnetic pole parts 17A having the magnet holding part 20 as the permanent magnets 12 on the same plane. A unit 19A is provided.
In the third cross section SC3-SC3, the core sheet 16 of the stator core 3 constituting the stator 1 does not have the connecting part 14b, and the magnetic pole part unit 19A constituting the rotor 10 has the magnet holding part 20. Therefore, while preventing the permanent magnet 12 from jumping out of the rotor core 3 due to centrifugal force, the connecting portion 14b of the stator 1, the connecting portion 14b of the stator 1, and the magnetic pole unit 19A constituting the rotor 10 are provided. The effect of reducing the leakage magnetic flux Φ generated between the magnet holding portions 20 and improving the torque can be obtained.
(4) Fourth section: SC4-SC4
As shown in FIG. 12A, in the stator core 3 constituting the fourth cross section: SC4-SC4 (see FIG. 3), the adjacent flange portions 14a are not connected by a connecting portion 14b of a magnetic material. The core sheet 16B does not have the connecting portion 14b. Further, the rotor core 3 constituting the fourth cross section: SC4-SC4 has the magnet holding part 20 provided with the same number of magnetic pole parts 17B not having the magnet holding part 20 as the permanent magnets 12 on the same plane. A magnetic pole unit 19B is provided.
Fourth section: SC4 to SC4, since the stator 1 does not have the connecting portion 14b and the rotor 10 does not have the magnet holding portion 20, the leakage flux Φ in the connecting portion 14b and the magnet holding portion 20 Can be further reduced, and the torque can be further improved.

In Embodiment 1 for carrying out the present invention, the rotating electrical machine has a first cross section: SC1-SC1, a second cross section: SC2-SC2, a third cross section: SC3-SC3, and a fourth cross section: SC4-. Since the SC4 is laminated, the strength of the inner periphery of the stator core 3 on the rotor 10 side is improved to reduce the vibration of the rotating electrical machine, and further, the armature winding 2 from the stator core 3 is reduced. The leakage magnetic flux Φ generated in the connecting portion 14b of the stator 1 and the magnet holding portion 20 of the rotor 10 is reduced and the torque is improved while preventing the jumping and holding down the permanent magnet 12 of the rotor 10. The effect that can be done.
Here, the integrated region SR4 having the fourth cross section: SC4-SC4 is integrated into the integrated region SR1 having the first cross section: SC1-SC1, the integrated region SR2 having the second cross section: SC2-SC2, and the third integrated region SR2. When arranged between the integration regions SR3 having the cross section: SC3-SC3, the axial leakage magnetic flux Φ generated between the coupling portion 14b of the stator 1 adjacent to the axial direction and the magnet holding portion 20 of the rotor 1 is reduced. And the torque can be further improved.

FIG. 13 shows the relationship between the ratio PS and the average torque occupied by the length in the stacking direction of the second section: SC2-SC2 and the third section: SC3-SC3 in the stacking direction length of the rotating electrical machine. is there. The horizontal axis indicates the ratio PS of the length in the stacking direction of the second section: SC2-SC2 and the third section: SC3-SC3 to the length in the stacking direction of the rotating electrical machine. The vertical axis is a dimensionless value obtained by dividing the average torque by the rotating electrical machine by the average torque with a ratio of the length in the stacking direction of the second section and the third section to the length in the stacking direction of the rotating electrical machine being 0%. is there.
That is, in FIG. 13, the second cross section with respect to the stacking direction length L (see FIG. 3) of the stator core 3 and the rotor core 10 in the rotary electric machine: Cross section: The sum ratio PS3 of SC3-SC3 and the sum SL3 is shown on the vertical axis PS = (SL2 + SL3) / L.
According to the figure, when the ratio PS in the stacking direction length of the second cross section: SC2-SC2 and the third cross section: SC3-SC3 to the stacking direction length of the rotating electrical machine increases from 0% to 60%, The second section: SC2-SC2 and the third section: SC3-SC3 have a length ratio PS, the stator 1 has a connecting portion 14b, and the rotor 10 has a magnet holding portion 20. One cross section: The ratio of the length in the stacking direction of SC1 to SC1 is reduced, and the leakage flux Φ generated between the connecting portion 14b of the stator 1 and the magnet holding portion 20 of the rotor 10 is reduced. It is rising. The ratio PS in the stacking direction length of the second cross section: SC2-SC2 and the third cross section: SC3-SC3 is 60%, and the average torque is maximum. In order to maximize the torque, it is most effective to set the ratio PS in the stacking direction length of the second cross section: SC2-SC2 and the third cross section: SC3-SC3 to 60% (for example, FIG. 3).
In the section where the ratio PS in the stacking direction length of the second cross section: SC2-SC2 and the third cross section: SC3-SC3 is 60% to 100%, the torque is reduced. This is because the ratio PS in the stacking direction length of the second cross section: SC2-SC2 and the third cross section: SC3-SC3 increases, and together with the first cross section: SC1-SC1, the connecting portion 14b of the stator 1 This is because the ratio of the length in the stacking direction of the fourth cross section: SC4-SC4, which does not have the magnet holding part 20 of the rotor 10 and has the least cross-sectional shape of the leakage magnetic flux Φ, decreases. The second cross section: SC2-SC2 and the third cross section: SC3-SC3, the torque increases as the ratio of the stacking direction length increases, the second cross section: SC2-SC2 and the third cross section: SC3-SC3 Even in a section where the ratio PS in the stacking direction length is 0% to 60%, the torque decreases as the ratio PS in the stacking direction length PS of the second cross section: SC2-SC2 and the third cross section: SC3-SC3 decreases. Even if the ratio PS between the second cross section: SC2-SC2 and the third cross section: SC3-SC3 is from 60% to 100%, at least the second cross section: SC2-SC2 and the third cross section: SC3-SC3 Torque can be improved by arranging the core sheet more than the thickness. In particular, when the ratio PS in the stacking direction length of the second cross section: SC2-SC2 and the third cross section: SC3-SC3 is changed from 20% to 80%, the torque can be improved by 0.1% or more.

Moreover, FIG. 14 showed the relationship between the ratio PS and the torque ripple occupied by the length in the stacking direction of the second cross section: SC2-SC2 and the third cross section: SC3-SC3 in the stacking direction length of the rotating electrical machine. Is. The horizontal axis indicates the ratio PS of the length in the stacking direction of the second section: SC2-SC2 and the third section: SC3-SC3 to the length in the stacking direction of the rotating electrical machine. The vertical axis represents the ratio of the torque ripple to the average torque by the rotating electrical machine, and the ratio PS of the stacking direction length of the second cross section: SC2-SC2 and the third cross section: SC3-SC3 to the stacking direction length of the rotating electrical machine PS. Is a dimensionless value divided by the ratio of the torque ripple to the average torque of 0%.
That is, FIG. 14 shows the second cross section with respect to the stacking direction length L (see FIG. 3) of the stator core 3 and the rotor core 10 in the rotating electrical machine: the sum SL2 of the integration direction lengths of SC2-SC2 and the third Cross section: The sum ratio PS3 of SC3-SC3 and the sum SL3 is shown on the vertical axis PS = (SL2 + SL3) / L.
From the figure, when the ratio PS in the stacking direction length of the second section: SC2-SC2 and the third section: SC3-SC3 increases from 0% to 20%, the torque ripple decreases by about 4%. The connecting portion 14b of the stator 1 and the magnet holding portion 20 of the rotor 10 are likely to be magnetically saturated by the leakage magnetic flux Φ, which causes torque ripple. In particular, in the first cross section SC1 to SC1 where the connecting portion 14b of the stator 1 and the magnet holding portion 20 of the rotor 10 are on the same plane: the connecting portion 14b of the stator 1 and the magnet holding portion 20 of the rotor 10. As a result, a leakage flux Φ is generated between them, so that the magnetic flux density of the coupling portion 14b of the stator 1 and the magnet holding portion 20 of the rotor 10 is further increased and magnetic saturation is likely to occur, resulting in an increase in torque ripple. When the ratio PS in the stacking direction length of the second section: SC2-SC2 and the third section: SC3-SC3 increases and the ratio of the first section: SC1-SC1 in the stacking direction length decreases, the section becomes fixed. The number of places where the connecting portion 14b of the rotor 1 and the magnet holding portion 20 of the rotor 10 are on the same plane in the stacking direction is reduced, and the leakage magnetic flux between the connecting portion 14b of the stator 1 and the magnet holding portion 20 of the rotor 10 is reduced. Since the number of magnetic saturation points is reduced due to Φ, if the ratio PS in the stacking direction length of the second cross section: SC2-SC2 and the third cross section: SC3-SC3 is increased from 0% to 20%, torque is increased. Ripple is decreasing. For the same reason, when the ratio PS in the stacking direction length of the second cross section: SC2-SC2 and the third cross section: SC3-SC3 increases from 20% to 80%, the torque ripple decreases by about 3% or more. To do. When the ratio PS in the stacking direction length of the second cross section: SC2-SC2 and the third cross section: SC3-SC3 is 80%, the torque ripple is minimized. In order to minimize the torque ripple, it is most effective to set the ratio PS in the stacking direction length of the second cross section: SC2-SC2 and the third cross section: SC3-SC3 to 80% (for example, Configuration as shown in FIG. On the other hand, when the ratio PS in the stacking direction length of the second cross section: SC2-SC2 and the third cross section: SC3-SC3 increases from 80% to 100%, the torque ripple increases by about 2%. This is because the ratio PS in the stacking direction length of the second cross section: SC2-SC2 and the third cross section: SC3-SC3 increases. This is because the ratio of the length in the stacking direction of the fourth cross section: SC4-SC4, which does not have the connecting portion 14b of the stator 1 and the magnet holding portion 20 of the rotor 10 that cause the increase, decreases. Torque ripples can be reduced by arranging the second cross section: SC2-SC2 and the third cross section: SC3-SC3 at least as thick as the core sheet. In particular, when the ratio PS in the stacking direction length of the second cross section: SC2-SC2 and the third cross section: SC3-SC3 is changed from 20% to 100%, the torque ripple can be reduced by 4% or more.
As described above, when the second cross section: SC2-SC2 and the third cross section: SC3-SC3 are arranged at least as thick as the core sheet, the torque ripple is reduced while improving the torque. The effect is obtained.
Although the number of poles of the rotor 10 of the rotating electrical machine 100 is 14 and the number of slots of the stator 1 is 18, the present invention is not limited to this. FIG. 16 shows a rotating electrical machine in which the rotor 10 has 10 poles and the stator 1 has 12 slots.

The stator 1 is composed of a core back 13, twelve teeth 14 that are arranged at equal intervals and project from the core back 13 in the direction of the magnetic gap length, and a magnetic member having twelve slots provided between the teeth 14. A stator core 3 made of a body and armature coils 2a accommodated in 12 slots of the stator core 3 are provided. The armature coil 2a is connected for each phase, and further connected externally, whereby the armature winding 2 is configured.
The armature coil 2a has four U phases: + U11, -U12, -U21, + U22, four V phases: + V11, -V12, -V21, + V22, and W phases: -W11, + W12, + W21, -W22. 16 are connected to each other, and as shown in FIG. 16, each coil corresponds to each of the teeth 1 to 12, + U11, -U12, -W11, + W12, + V11, -V12, -U21, + U22, + W21, −W22, −V21 are arranged in this order. However, “+” and “−” indicate the winding polarity of the coil, and “+” and “−” have opposite winding polarities. The twelve armature coils 2a are connected for each phase, and further connected externally to form the armature winding 2.

The rotor 10 is arranged with a stator 1 and a magnetic gap, and both ends are provided by a first bearing 7 in which the rotor core 3 is fitted in the housing 5 and a second bearing 9 in which the frame 4 is fitted. The part is fixed to a shaft 9 that is rotatably supported, and 10 permanent magnets 12 are embedded in the rotor core 11 at equal intervals in the circumferential direction.
Ten permanent magnets 12 are embedded at equal intervals in the circumferential direction in a permanent magnet embedded portion 12 a provided in the rotor core 11.
With such a configuration, since the number of slots of the stator 1 is 12 and the number of poles of the rotor 10 is 10, the number of connecting portions 14b of the stator 1 and the number of magnet holding portions 20 of the rotor 10 can be reduced. Therefore, the effect of reducing the leakage magnetic flux and improving the torque can be obtained. In addition, in a rotating electric machine with the number of poles of the rotor 10 and the number of slots of the stator 1 being 12, there is a problem that vibration is increased. However, this configuration can reduce torque ripple while improving torque. Can be obtained.

  According to the first embodiment of the present invention, a core sheet 16 including a core back 13 and a plurality of teeth 14 is wound around the stator core 3 and the teeth 14 configured by laminating a plurality of sheets in the axial direction. A rotor core 11 formed by laminating a plurality of magnetic pole part units 19 including a stator 1 having an armature winding 2 and a magnetic pole part 17 and a plurality of embedded parts 12a in the axial direction, and an embedded part 12a. The rotor 10 having the permanent magnet 12 embedded in the rotary electric machine is disposed through a magnetic gap, and at least one of the core sheets 16 has the tip of the adjacent teeth 14 on the rotor 10 side. It has a connecting part 14b to be connected, and at least one of the magnetic pole part units 19 has a magnet holding part 20 for holding the permanent magnet 12 on the stator 1 side, and the core sheet 16 is attached. In the disk-shaped laminated body composed of the rotor core 11 formed by laminating the stator core 3 and the magnetic pole unit 19 that are layered, the disk-shaped laminated body in the cross section of the disk-shaped laminated body The magnetic pole part unit 19 in the rotor core 11 constituting the rotor 10 has the connecting portion 14b of the core sheet 16 in the stator core 3 constituting the stator 1 in at least one part in the axial direction of The rotor 10 is configured without the integrated portion composed of the laminated region SR2 having the cross section SC2 that does not have the magnet holding portion 20, and the connecting portion 14b of the core sheet 16 in the stator core 3 that constitutes the stator 1. The magnetic pole unit 19 in the rotor core 11 is configured such that there is an integrated portion composed of a laminated region SR3 having a cross section SC3 having a magnet holding portion 20. In the cross section of the stator core 3 and the rotor core 11, only one of the connecting portion 14b and the magnet holding portion 20 is present in at least some of the cross sections in the axial direction of the stator core 3 and the rotor core 11. Is generated in the connecting portion 14b of the core sheet 16 of the stator core 3 constituting the stator 1 and the magnet holding portion 20 of the magnetic pole part unit 19 constituting the rotor 10. Since the magnetic flux Φ can be reduced, the rigidity of the stator 1 can be increased, and the torque can be improved while the permanent magnet 12 embedded in the rotor core 11 is pressed.

  Further, according to Embodiment 1 of the present invention, in the configuration of the preceding paragraph, the disk-shaped stacked body may have any one part in the axial direction of the disk-shaped stacked body in a cross section of the disk-shaped stacked body. The cross section in which the magnetic core unit 19 in the rotor core 11 constituting the rotor 10 does not have the magnet holding part 20 without the connecting part 14b of the core sheet 16 in the stator core 3 constituting the stator 1 The integrated portion composed of the stacked region SR4 having SC4 is configured to exist, and in any one of the cross sections in the axial direction of the stator core 3 and the rotor core 11, the connecting portion 14b and the magnet holding portion 20 are provided. Since none of them is configured, the coupling portion 14b of the core sheet 16 of the stator core 3 constituting the stator 1 and the magnetism of the magnetic pole unit 19 constituting the rotor 10 are configured. It is possible to reduce the leakage magnetic flux Φ generated by the holding portion 20, the rigidity of the stator 1, while holding the permanent magnets 12 embedded in rotor core 11, it is possible to improve the torque.

  And according to Embodiment 1 which concerns on this invention, in the structure of the preceding clause or the preceding paragraph, the lamination direction length of the area | region which has a cross section in which any one of the connection part 14b and the magnet holding | maintenance part 20 exists, Since the ratio PS to the stacking direction length of the stator core 3 and the rotor core 11 is 20% to 80%, the connecting portion of the core sheet 16 of the stator core 3 constituting the stator 1 14b and the leakage magnetic flux Φ generated in the magnet holding part 20 of the magnetic pole part unit 19 constituting the rotor 10 can be reduced, so that the rigidity of the stator 1 is increased and the permanent magnetic core 11 embedded in the rotor core 11 is permanent. Torque can be improved while holding down the magnet 12.

Embodiment 2. FIG.
A second embodiment of the present invention will be described with reference to FIG. FIG. 17 is a longitudinal sectional view of a rotating electrical machine in the second embodiment for carrying out the present invention.
The stator core 11 includes a core sheet block 160A having a connecting portion 14b in which a plurality of core sheets 16A having a connecting portion 14b are continuously stacked, and a core sheet 16B having no connecting portions 14b that are continuously stacked. A core sheet block 160B having no part 14b, and the rotor core 11 has a magnetic pole part unit block 190A having a magnet holding part 20 in which a plurality of magnetic pole part units 19A having a magnet holding part 20 are continuously stacked, and The magnetic pole part unit block 190B does not have the magnet holding part 20 in which a plurality of the magnetic pole part units 19B without the magnet holding part 20 are continuously stacked. With such a configuration, as shown in FIG. 17, the axial leakage magnetic flux generated between the coupling portion 14 b of the stator 1 adjacent to the axial direction and the magnet holding portion 20 of the rotor 10 is shown in FIG. 3. Therefore, the torque can be improved.

The stator core 3 includes not only the core sheet block 160A having the connecting portion 14b and the core sheet block 160B having no connecting portion 14b, but also the core sheet having the connecting portion 14b in a part of the stacking direction, It goes without saying that the same effect can be obtained even if a core sheet having no portion 14b is included.
Similarly, the rotor core 11 includes not only the magnetic pole unit block 190A having the magnet holding part 20 and the magnetic pole part unit block 190B having no magnet holding part 20, but also a magnet holding part in a part of the stacking direction. Needless to say, the same effect can be obtained even if a magnetic pole part unit having 20 or a magnetic pole part unit without the magnet holding part 20 is included.

  According to the second embodiment of the present invention, in the configuration in the first embodiment described above, the stator core 3 has a core sheet having a connecting portion 14b in which a plurality of core sheets 16A having the connecting portions 14b are laminated in succession. The rotor core 11 includes a magnet holding unit 20. The rotor core 11 includes a block 160 </ b> A and a core sheet block 160 </ b> B that does not have a connecting part 14 b in which a plurality of core sheets 16 </ b> B that do not have a connecting part 14 b are continuously stacked. There is no magnetic pole unit block 190A having a magnet holding part 20 in which a plurality of magnetic pole part units 19A are continuously stacked, and no magnet holding part 20 in which a plurality of magnetic pole part units 19B without a magnet holding part 20 are stacked. Since it is composed of the magnetic pole unit block 190B, it is generated by the connecting portion 14b of the stator 1 and the magnet holding portion 20 of the rotor 10. It is possible to reduce the leakage magnetic flux Φ to increase the rigidity of the stator 1, while holding the permanent magnets 12 embedded in rotor core 11, it is possible to improve the torque.

Embodiment 3 FIG.
(Explanation of sectional view of rotating electrical machine)
A third embodiment of the present invention will be described with reference to FIGS. FIG. 18 is a kind of sectional view showing the configuration of the rotating electrical machine in the third embodiment for carrying out the present invention. Although the basic configuration is the same as that of the first embodiment, the structure of the rotor core is different.
The rotor core 11 is configured by laminating magnetic pole unit 19 (19A, 19B) made of a circular magnetic body in which the same number of magnetic pole parts 17 as the permanent magnet 12 are integrated. In the magnetic pole unit 19 (19A, 19B), permanent magnet embedded portions 12a are arranged at equal intervals in the circumferential direction. Further, at least one of the magnetic pole unit 19 (19A, 19B) constituting the rotor core 11 holds the permanent magnet 12 and faces the stator 1 and is made of a magnetic material. 20

The magnet holding unit 20 in the third embodiment for carrying out the present invention does not press the permanent magnet 12 in the radial direction, but the magnet holding unit 20 increases the strength of the outer peripheral portion of the rotor core 11, Even if a centrifugal force acts on the permanent magnet 12 during rotation of the rotating electrical machine and a radial force is applied to the permanent magnet 12, it is possible to prevent the permanent magnet 12 from jumping out of the rotor core 11.
Fourteen permanent magnets 12 are embedded at equal intervals in the circumferential direction in a permanent magnet embedded portion 12 a provided in the rotor core 11. When the rotating electrical machine rotates, centrifugal force F3 acts on the permanent magnet 12 in the radial direction and tries to jump out of the rotor core 11. By providing the magnet holder 20 on the rotor core 11, the magnet holder 20 The force F4 that presses the permanent magnet 12 works, and the effect of suppressing the centrifugal force is obtained.
By adopting such a structure, the surface area of the rotor core 11 facing the stator 1 is increased, so that the effect of improving the reluctance torque while reducing cogging torque and torque ripple can be obtained.

(Description of configuration of rotor core of rotating electrical machine)
FIG. 19 is a plan view showing a magnetic pole part unit 19 </ b> A having a magnet holding part 20 that has a magnet holding part 20 that holds the permanent magnet 12 and faces the stator 1.
The magnetic pole part unit 19 having the magnet holding part 20 provided on the shaft 9 is formed as a disk-shaped member, and the same number of permanent magnet embedded parts as the permanent magnets 12 in the inner diameter part leaving the peripheral edge from the outer periphery of the disk-shaped member. 12a are arranged at intervals with a constricted hole, and the permanent magnets 12 are arranged in these permanent magnet embedded portions 12a. The peripheral part of the disk-shaped member located on the outer diameter side of the permanent magnet 12 constitutes the magnetic pole part 17, and this peripheral part functions as a magnet holding part 20 that restricts the movement of the permanent magnet 12 in the outer diameter direction.
A centrifugal force acts on the permanent magnet 12 during the rotating operation of the rotating electrical machine. However, in the magnetic pole unit 19A having the magnet holding portion 20, the force that the magnet holding portion 20 presses the permanent magnet 12 works as a reaction force of the centrifugal force. It is possible to prevent the magnet 12 from jumping out of the rotor core 11. Further, since the number of parts constituting the rotor core 11 is small, it is possible to obtain an effect of reducing the manufacturing cost and simplifying the manufacturing.
On the other hand, when this magnet holding part 20 becomes a magnetic flux path, a leakage magnetic flux is generated, and the magnetic flux in the gap between the stator 1 and the rotor 10 is reduced, which causes a reduction in torque.

FIG. 20 shows a magnetic pole unit 19 </ b> B that does not have the magnet holding unit 20. The rotor core 11 has permanent magnet embedded portions 12a at equal intervals in the circumferential direction, and the permanent magnets 12 are embedded in the permanent magnet embedded portions 12a.
The disk-shaped member constituting the magnetic pole unit 19B has a configuration in which the outer diameter side portion of the permanent magnet 12 is deleted and the magnet holding unit 20 is not provided.
A magnetic pole part 17 is bonded to the gap of the permanent magnet 12 facing the stator 1 with an adhesive or the like, and the magnetic pole part 17 is laminated integrally with caulking. The magnetic pole part unit 19B without the magnet holding part 20 can improve the torque because no leakage magnetic flux Φ is generated in which the magnet holding part 20 serves as a magnetic flux path.

The rotor core 11 in the present embodiment is configured by laminating a magnetic pole part unit 19A having a magnet holding part 20 and a magnetic pole part unit 19B having no magnet holding part 20. For this reason, the effect that the magnetic flux leakage can be reduced and the torque can be improved while the permanent magnet 12 is held down.
Since the configuration of the connecting portion 14b of the stator 1 and the magnet holding portion 20 of the rotor 10 in the stacking direction is the same as that in the first embodiment, the rigidity of the stator 1 is increased and the permanent magnet 12 embedded in the rotor core 11 is used. While preventing the pop-up, it is possible to reduce the magnetic flux leakage and improve the torque.

  According to the third embodiment of the present invention, in the configuration in the first or second embodiment described above, the magnetic pole unit 19 constituting the rotor core 11 is formed of a disk-shaped member, and the circular In the magnetic pole part unit 19A having the magnet holding part 20, the peripheral part on the outer diameter side of the permanent magnet 12 in the disk-like member is disposed while leaving the peripheral part of the plate-like member on the inner diameter side. In the magnetic pole unit 19B that does not have the magnet holding part 20, the peripheral part on the outer diameter side of the permanent magnet 12 in the disk-shaped member is deleted. 1 can reduce the leakage magnetic flux Φ generated in the connecting portion 14b and the magnet holding portion 20 of the rotor 10, so that the rigidity of the stator 1 is increased, and the permanent magnet 20 embedded in the rotor core 11 is provided. Holding Unwilling also, it is possible to improve the torque, moreover, since there is less number of parts constituting the rotor core 11, to reduce the production cost, the effect is obtained such as the manufacture is simplified.

Embodiment 4 FIG.
(Explanation of sectional view of rotating electrical machine)
A fourth embodiment of the present invention will be described with reference to FIGS. FIG. 21 is a kind of sectional view showing the configuration of the rotating electrical machine in the fourth embodiment for carrying out the present invention. Although the basic configuration is the same as that of the first embodiment, the structure of the rotor core is different.
The rotor core 11 is composed of a magnetic pole part unit 19C having magnetic pole parts 17 made of the same number of magnetic bodies as the number of poles of the permanent magnet 12 on the same plane. The magnetic pole portions 17 are arranged at equal intervals in the circumferential direction, and permanent magnet embedded portions 12 a are provided between adjacent magnetic pole portions 17. In addition, at least one of the magnetic pole part units 19C constituting the rotor core 11 has the magnetic pole part 17 constituting the magnetic pole part unit 19C holding the permanent magnet 12 and facing the stator 1. It has the magnet holding | maintenance part 20 which consists of a magnetic body. The magnet holding part 20 provided in the magnetic pole part unit 19C having the magnet holding part 20 in the fifth embodiment for carrying out the present invention is only on either the left or right side of the magnetic pole part 17 as shown in FIG. Asymmetric shape. By doing so, the number of magnet holding parts of the magnetic pole part unit 20 can be reduced, and the leakage magnetic flux generated in the magnet holding part 20 and between the coupling part 14b of the stator 1 and the magnet holding part 20 is reduced. The effect that torque can be further improved is obtained.
The permanent magnets 12 are embedded at equal intervals in the circumferential direction in permanent magnet embedded portions 12 a provided in the rotor core 11. When the rotating electrical machine rotates, a centrifugal force acts on the permanent magnet 12 in the radial direction and tries to jump out of the rotor core 11. By providing the magnet holder 20 on the rotor core 11, the magnet holder 20 The effect of holding down the permanent magnet 12 and suppressing centrifugal force is obtained. In FIG. 21, the magnet holding unit 20 is provided on the left side of the magnetic pole part 17, but it goes without saying that the same effect can be obtained even if it is provided on the right side of the magnetic pole part 17.

FIG. 22 is a cross-sectional view showing a rotor of the rotating electrical machine according to Embodiment 4 for carrying out the present invention.
The rotor core 11 is a magnetic pole unit 19 </ b> C having a magnet holding part 20 only on the left side of the permanent magnet 12. With such a configuration, the magnet holding part 20 can hold the permanent magnet 12 to prevent the permanent magnet 12 from jumping out, reduce the number of the magnet holding parts 20 of the magnetic pole part unit 19C, and reduce the leakage magnetic flux. The effect is obtained that the torque can be improved by reducing the torque. Here, although the magnet holding part 20 is provided on the left side of the permanent magnet 12, it goes without saying that the same effect can be obtained even if the magnet holding part 20 is provided on the right side of the permanent magnet 12. .
Further, by stacking the same number of the magnetic pole unit 19C having the magnet holding part 20 on the left side of the magnetic pole part 17 and the magnetic pole part unit 19 having the magnet holding part 20 on the right side of the magnetic pole part 17, two rotations of the rotating electric machine can be performed. Differences in torque ripple, cogging, and average torque can be eliminated with respect to directions (clockwise and counterclockwise).

  In the fourth embodiment for carrying out the present invention, the configuration in the stacking direction of the connecting portion 14b of the stator 1 and the magnet holding portion 20 of the rotor 10 is the same as that of the first embodiment. It is possible to reduce the number of magnet holding portions 20 of the rotor 1 opposed to 14b and the number of magnet holding portions 20 of the rotor 10 adjacent to the connecting portion 14b of the stator 1 in the axial direction. Therefore, while the rigidity of the stator 1 is increased and the permanent magnet 12 embedded in the rotor core 11 is prevented from jumping out, the leakage flux Φ can be further reduced and the torque can be further improved.

  According to the fourth embodiment of the present invention, in any of the configurations of the first to third embodiments described above, the magnet holding portion 20 provided in the magnetic pole portion 17 constituting the rotor core 11 is arranged in the rotation direction. Since it is asymmetric with respect to the stator 14, the leakage magnetic flux Φ generated at the connecting portion 14 b of the stator 1 and the magnet holding portion 20 of the rotor 10 can be reduced. Torque can be improved while pressing the permanent magnet 12 embedded in the magnet.

  Further, according to the fourth embodiment of the present invention, in the configuration of the preceding paragraph, the permanent magnet 12 protrudes along the stator 1 side portion of the permanent magnet 12 to the magnetic pole portion 17 where the permanent magnet 12 is disposed on both sides in the circumferential direction. In the case where the magnet holding portion 12 for holding the magnet 12 is provided, the magnet holding portion 20 is provided so as to protrude only in one of the circumferential directions, so that the coupling portion 14b of the stator 1 and the magnet holding of the rotor 10 are provided. Since the leakage magnetic flux Φ generated in the part 20 can be reduced, the rigidity of the stator 1 can be increased and the torque can be improved while the permanent magnet 12 embedded in the rotor core 11 is pressed.

  According to the fourth embodiment of the present invention, in the configuration of the preceding paragraph, the magnetic pole unit 19C constituting the rotor core 11 is formed by a disk-shaped member, and the peripheral edge of the disk-shaped member The permanent magnet 12 is disposed on the inner diameter side, and the peripheral portion of the disc-shaped member is used as the magnet holding portion 20 that holds the permanent magnet 12. Since a part of the magnet holding part 20 provided in the magnetic pole part 17 of the magnetic pole part unit 19 constituting the rotor core 11 is asymmetric with respect to the rotation direction by removing a part, the connection of the stator 1 Since the leakage flux Φ generated in the portion 14b and the magnet holding portion 20 of the rotor 10 can be reduced, the rigidity of the stator 1 is increased and the permanent magnet 12 embedded in the rotor core 11 is pressed down. Can improve torque That.

Embodiment 5 FIG.
(Explanation of sectional view of rotating electrical machine)
Embodiment 5 according to the present invention will be described with reference to FIG. 23. FIG. 23 is a type of sectional view showing the configuration of the rotating electrical machine according to Embodiment 5 for carrying out the present invention. Although the basic configuration is the same as that of the first embodiment, the structure of the rotor core is different.
The rotor core 11 is composed of a magnetic pole unit 19D having magnetic pole parts 17 (17A, 17B) made of the same number of magnetic bodies as the number of poles of the permanent magnet 12 on the same plane. The magnetic pole portions 17 (17A, 17B) are arranged at equal intervals in the circumferential direction, and a permanent magnet embedded portion 12a is provided between the adjacent magnetic pole portions 17 (17A, 17B). In addition, at least one of the magnetic pole part units 19D constituting the rotor core 11 has the magnetic pole part 17 constituting the magnetic pole part unit 19D holding the permanent magnet 12 and facing the stator 1. It has the magnet holding | maintenance part 20 which consists of a magnetic body.
The magnetic pole unit 19D having the magnet holding part 20 in the seventh embodiment for carrying out the present invention does not have the magnetic pole part 17A having the magnet holding part 20 and the magnet holding part 20 as shown in FIG. It consists of a magnetic pole part 17B. By doing so, the number of the magnet holding parts 20 of the magnetic pole part unit 19D can be reduced, and the leakage magnetic flux Φ generated in the magnet holding part 20 and between the coupling part 14b of the stator 1 and the magnet holding part 20 can be reduced. Thus, the effect of reducing the torque and further improving the torque can be obtained.

The permanent magnets 12 are embedded at equal intervals in the circumferential direction in permanent magnet embedded portions 12 a provided in the rotor core 11. When the rotating electrical machine rotates, a centrifugal force acts on the permanent magnet 12 in the radial direction and tries to jump out of the rotor core 11. By providing the magnet holder 20 on the rotor core 11, the magnet holder 20 The effect of holding down the permanent magnet 12 and suppressing centrifugal force is obtained.
Further, when the number of magnet holding portions 20 provided in the magnetic pole portion 17 (17A, 17B) in the entire rotor core 11 is made symmetric in the rotation direction, two rotation directions (clockwise and counterclockwise) of the rotating electric machine are obtained. ), The difference in torque ripple, cogging and average torque can be eliminated.

  In the fifth embodiment for carrying out the present invention, the configuration in the stacking direction of the connecting portion 14b of the stator 1 and the magnet holding portion 20 of the rotor 10 is the same as that in the first embodiment. The number of magnet holding parts 20 of the rotor 10 facing 14b and the number of magnet holding parts 20 of the rotor 10 adjacent to the connecting part 14b of the stator 1 in the axial direction can be reduced. Therefore, while the rigidity of the stator 1 is increased and the permanent magnet 12 embedded in the rotor core 11 is prevented from jumping out, the leakage flux Φ can be further reduced and the torque can be further improved.

  According to the fifth embodiment of the present invention, in any configuration of the first to fourth embodiments described above, the magnetic pole unit 19D having the magnet holding unit 20 includes the magnetic pole unit 17A provided with the magnet holding unit 20 and the magnetic pole unit 17A. Since the magnetic pole part 17B not provided with the magnet holding part 20 is provided, the leakage magnetic flux Φ generated in the coupling part 14b of the stator 1 and the magnet holding part 20 of the rotor 10 can be reduced. 1 is increased and the permanent magnet 12 embedded in the rotor core 11 is pressed down, while the magnetic flux Φ can be further reduced and the torque can be further improved. Torque can be improved.

Embodiment 6 FIG.
FIG. 24 is an explanatory diagram of a circuit of the rotating electrical machine and the ECU 200 in the sixth embodiment. In FIG. 24, details are omitted for simplicity, and only the armature winding is shown.
The armature winding of the rotating electrical machine includes an armature winding 2A constituted by a first U-phase winding U1, a first V-phase winding V1, and a first W-phase winding W1, and a second U-phase winding. The armature winding 2B is composed of the line U2, the second V-phase winding V2, and the second W-phase winding W2.
Here, in the armature coil of FIG. 24, the first U-phase winding is constituted by + U11, -U12, + U13 connected in series, and the second U-phase winding is -U21, + U22, -U23. Is composed of a series connection of + V11, -V12 and + V13, and a second V-phase winding is composed of -V21, + V22 and -V23. The first W-phase winding is composed of -W11, + W12, and -W13 connected in series, and the second W-phase winding is composed of + W21, -W22, and + W23 in series. Composed of connected ones. However, “+” and “−” indicate the winding polarity of the coil, and “+” and “−” have opposite winding polarities.

Here, since ECU 200 is also simple, details are omitted, and only the power circuit portion of the inverter is shown.
The ECU 200 is composed of two inverter circuits, and supplies a three-phase current to the two armature windings 2 from each inverter. The ECU is supplied with DC power from a power source 21 such as a battery, and is connected to a power relay 23 via a coil 22 for removing noise. In FIG. 24, the power source is depicted as if inside the ECU, but in reality, power is supplied from an external power source such as a battery via the connector 24. There are two power relays, power relays 23A and 24A, each composed of two MOS-FETs. When a failure occurs, the power relay is opened to prevent excessive current from flowing. In FIG. 24, the power supply relays 23A and 23B are connected in the order of the power supply, the coil, and the power supply relay, but it goes without saying that the power supply relays 23A and 23B may be provided at a position closer to the power supply than the coil.
The capacitors 24A and 24B are smoothing capacitors. In FIG. 24, each is constituted by one capacitor, but it goes without saying that a plurality of capacitors may be connected in parallel. The inverter 25A and the inverter 25B are each configured by a bridge using six MOS-FETs (hereinafter simply referred to as FETs). In the inverter 25A, the FETs 11 and 12 are connected in series, the FETs 13 and 14 are connected in series, and the FET 15 FET 16 are connected in series, and these three sets of FETs are connected in parallel. Further, one shunt resistor S is connected to each of the GND (ground) side of the lower three FETs 12, FET 14, and FET 16, which are designated as S11, S12, and S13. These shunt resistors are used for detecting the current value.
In addition, although the example of three shunts was shown, since it may be two shunts or current detection is possible even with one shunt, such a configuration may be used. Needless to say.

  As shown in FIG. 22, the current is supplied to the rotating electrical machine side from between FET 11 and FET 12 to the U1 phase of the rotating electrical machine through a bus bar, and from between FET 13 and FET 14 to the V1 phase of the rotating electrical machine through the bus bar. Supplied to the W1 phase of the rotating electrical machine through a bus bar or the like. The inverter 25B has the same configuration. In the inverter 25B, FET21 and FET22 are connected in series, FET23 and FET24 are connected in series, FET25 and FET26 are connected in series, and these three sets of FETs are connected in parallel. Has been. Further, one shunt resistor is connected to each of the lower three FETs 22, 24, and 26 on the GND (ground) side, and a shunt 21, a shunt 22, and a shunt 23 are provided. These shunt resistors are used for detecting the current value. In addition, although the example of three shunts was shown, since it may be two shunts or current detection is possible even with one shunt, such a configuration may be used. Needless to say. As shown in FIG. 22, the current is supplied to the rotating electrical machine side from between the FET 21 and FET 22 to the U2 phase of the rotating electrical machine through the bus bar and from between the FET 23 and FET 24 to the V2 phase of the rotating electrical machine through the bus bar and the like. Supplied to the W2 phase of the rotating electrical machine through a bus bar or the like. The two inverters 25A and 25B are switched by sending a signal from a control circuit (not shown) to the MOS-FET according to the rotation angle detected by a rotation angle sensor (not shown) provided in the rotating electric machine. A desired three-phase current is supplied to the winding 2A and the armature winding 2B. For the rotation angle sensor, a resolver, a GMR sensor, an MR sensor, or the like is used.

When the rotating electric machine has such a configuration, the following effects can be obtained.
First, FIG. 24 shows a configuration example in which the neutral points N1 and N2 are not electrically connected. If the neutral point of the two armature circuits is not electrically connected in this way, a normal inverter and armature circuit can be used as long as they are electrically independent even if a short circuit occurs inside the rotating electric machine. Since the torque can be generated, the effect at the time of short circuit can be reduced. Further, when the rotating electric machine is driven by only one inverter, there is a problem that the arrangement of the armature windings becomes unbalanced and the vibration and noise of the rotating electric machine increase, but as described in the first to fifth embodiments. Vibration and noise can be reduced by the configuration.
Further, when the rotating electric machine is driven by two inverters, there is a problem that vibration and noise of the rotating electric machine increase when an imbalance occurs in the current and voltage of the two inverters. With the described configuration, vibration and noise can be reduced.

FIG. 24 shows an example in which there is no motor relay. However, a motor relay may be provided, and measures such as reducing the brake torque can be taken by opening the motor relay when a failure occurs.
24, the first U-phase winding is composed of + U11, -U12, + U13 connected in series, and the second U-phase winding is -U21, + U22, -U23. The first V-phase winding is composed of + V11, -V12, and + V13 connected in series, and the second V-phase winding is composed of -V21, + V22, and -V23 in series. The first W-phase winding is configured by connecting -W11, + W12, and -W13 in series, and the second W-phase winding is configured by connecting + W21, -W22, and + W23 in series. However, it is needless to say that the same effect can be obtained by other connection methods. Needless to say, the same effect can be obtained even if the rotating electrical machine has other pole numbers and slots.

  According to the sixth embodiment of the present invention, in the configuration of any of the first to fifth embodiments described above, the armature winding 2 includes a first U-phase winding and a first V-phase winding. A first W-phase winding; a second U-phase winding; a second V-phase winding; and a second W-phase winding; One V-phase winding and the first W-phase winding are connected to a first inverter, the second U-phase winding, the second V-phase winding, and the second W-phase winding. Is connected to the second inverter, so that the leakage flux Φ generated in the coupling portion 14b of the stator 1 and the magnet holding portion 20 of the rotor 10 can be reduced. The rigidity can be increased and the torque can be improved while holding down the permanent magnet 12 embedded in the rotor core 11.

Embodiment 7 FIG.
A seventh embodiment according to the present invention will be described with reference to FIG. FIG. 25 is an explanatory diagram of an electric power steering device 400 for an automobile according to Embodiment 7 for carrying out the present invention.
In the operating state of the electric power steering apparatus 400, the driver steers a steering wheel (not shown), and the torque is transmitted to the shaft 41 via a steering shaft (not shown). At this time, the torque detected by the torque sensor 42 is converted into an electrical signal and transmitted to the ECU (control unit) 200 via a connector 43A through a cable (not shown). On the other hand, vehicle information such as vehicle speed is converted into an electrical signal and transmitted to the ECU via the connector 43B. The ECU calculates necessary assist torque from the vehicle information such as torque and vehicle speed, and supplies current to the rotating electrical machine through the inverter. The rotating electrical machine is arranged in a direction parallel to the moving direction of the rack shaft (indicated by arrow A). The power supply to the ECU is sent from a battery or alternator via a power connector. Torque generated by the rotating electrical machine is decelerated by a gear box 44 containing a belt (not shown) and a ball screw (not shown), and a rack shaft (not shown) inside the housing 45 is moved in the direction of arrow A. Thrust is generated to assist the driver's steering force. As a result, the tie rod 46 moves and the tire can be steered to turn the vehicle. Assisted by the torque of the rotating electrical machine, the driver can turn the vehicle with a small steering force. The rack boot 47 is provided so that foreign matter does not enter the apparatus.

In such an electric power steering device, the cogging torque and torque ripple generated by the rotating electric machine are transmitted to the driver via the gear, and therefore it is desirable that the cogging torque and torque ripple be small in order to obtain a good steering feeling. . In addition, it is desirable that the vibration and noise when the rotating electrical machine operates is small.
Therefore, when the rotating electrical machine described in the first to sixth embodiments is mounted, the effects described in the respective embodiments can be obtained. In particular, cogging torque and torque ripple are reduced while improving the average torque, and it is possible to achieve both low vibration and noise, high torque, and downsizing. Further, since the rotating electrical machine 100 in the electric power steering apparatus 400 generates a thrust for moving the rack shaft, the rotating electrical machine 100 rotates both clockwise and counterclockwise, as described in the first to sixth embodiments. In the rotating electric machine, torque ripple can be reduced in both the clockwise and counterclockwise directions of the rotating electric machine. Further, differences in torque ripple, cogging torque, and average torque with respect to the rotation direction can be eliminated. As described above, it is possible to obtain the effects that the electric power steering apparatus 400 can achieve low vibration, low noise, and high torque.

  As shown in FIG. 25, the rotating electrical machine 100 is disposed in a direction parallel to the rack shaft movement direction A (indicated by an arrow). The electric power steering device 400 is a system suitable for a large vehicle. However, there has been a problem that vibration and noise caused by the rotating electrical machine 100 increase at the same time as the high output. However, if the rotating electrical machine described in the first to sixth embodiments is applied, this problem can be solved, and the electric power steering device can be applied to a large vehicle, and the fuel consumption can be reduced.

  According to the seventh embodiment of the present invention, since the electric power steering device 400 including the rotating electric machine 100 that includes any of the configurations of the first to sixth embodiments described above is provided, the rigidity of the stator 1 is increased. The rotating electrical machine 100 that can increase the torque while holding down the permanent magnet embedded in the rotor core 11 can be used as a drive source of the electric power steering device 400.

  It should be noted that within the scope of the present invention, a part or all of each embodiment can be freely combined, or each embodiment can be appropriately modified or omitted.

  DESCRIPTION OF SYMBOLS 100 Rotating electric machine, 200 ECU, 300 Sensor part, 400 Electric power steering apparatus, 1 Stator, 2, 2A, 2B Armature winding, 2a Armature coil, 3 Stator iron core, 4 Frame, 4a Wall part, 5 Housing , 6 bolts, 7, 8 bearings, 9 shafts, 10 rotors, 11 rotor iron cores, 12 permanent magnets, 13 core backs, 14 teeth, 14a flanges, 14b connecting parts, 16, 16A, 16B core sheets, 17, 17A, 17B magnetic pole part, 18 bridge part, 19, 19B, 19C, 19D magnetic pole part unit, 20 magnet holding part, 24 power connector, 41 shaft, 42 torque sensor, 43A, 43B connector, 44 gear box, 45 housing, 46 Tie rod, 47 rack boots.

Claims (12)

  A stator core formed by laminating a plurality of core sheets including a plurality of teeth in the axial direction, a stator having an armature winding wound around the teeth, a magnetic pole portion, and a plurality of permanent magnets A rotating electrical machine in which a rotor core configured by laminating a plurality of magnetic pole unit units each including an embedded portion in an axial direction and a rotor having a permanent magnet embedded in the embedded portion are disposed via a magnetic gap. And at least one of the core sheets has a connecting portion that connects tip portions of the adjacent teeth on the rotor side, and at least one of the magnetic pole unit has the permanent magnet as the stator. A magnet holding portion for holding at a side, and in a cross section of the stator core and the rotor core, at least what is in the axial direction of the stator core and the rotor core. Or a part of the cross section, the rotating electrical machine, characterized by being configured to only one of the connecting portion and the magnet holder is present.   2. The structure according to claim 1, wherein the coupling portion and the magnet holding portion are not present in any one of the cross sections in the axial direction of the stator core and the rotor core. Rotating electric machine.   The ratio of the length in the stacking direction of the region having a cross section in which only one of the coupling part and the magnet holding part exists to the length in the stacking direction of the stator core and the rotor core is 20% or more. The rotating electrical machine according to claim 1 or 2, characterized in that   A ratio of the length in the stacking direction of the region having a cross section in which only one of the coupling part and the magnet holding part exists to the length in the stacking direction of the stator core and the rotor core is 20% to 80%. The rotating electrical machine according to any one of claims 1 to 3, wherein the rotating electrical machine is.   The stator core includes a core sheet block having the connecting portion in which a plurality of the core sheets having the connecting portion are continuously stacked, and a connection in which the core sheets having no connecting portion are continuously stacked. The rotor core has a magnetic pole part unit block having the magnet holding part in which a plurality of the magnetic pole part units having the magnet holding part are continuously stacked, and the magnet The magnetic pole part unit block which does not have the said magnet holding | maintenance part which laminated | stacked the said magnetic pole part unit which does not have a holding | maintenance part in succession is comprised in any one of Claim 1 to 4 characterized by the above-mentioned. The rotating electrical machine described.   The magnetic pole unit constituting the rotor core is formed by a disk-shaped member, and the permanent magnet is disposed on the inner diameter side leaving the peripheral edge of the disk-shaped member, and the disk-shaped member The rotating electrical machine according to any one of claims 1 to 5, wherein a peripheral edge portion is the magnet holding portion for holding the permanent magnet.   The magnetic pole unit constituting the rotor iron core, wherein the magnet holding portion provided in the magnetic pole portion is asymmetric with respect to the rotation direction. The rotating electrical machine described in 1.   In the magnetic pole portion where the permanent magnets are arranged on both sides in the circumferential direction, the magnet holding portion that protrudes along the stator side portion of the permanent magnet and holds the permanent magnet is provided. 8. The rotating electrical machine according to claim 7, wherein the rotating electrical machine is provided so as to protrude only in one of the circumferential directions.   The magnetic pole unit constituting the rotor core is formed by a disk-shaped member, and the permanent magnet is disposed on the inner diameter side leaving the peripheral edge of the disk-shaped member, and the disk-shaped member In the case where the peripheral part is the magnet holding part for holding the permanent magnet, a part of the peripheral part of the disk-like member is deleted, and the magnetic pole part that constitutes the rotor core is provided with the magnetic pole part. The rotating electrical machine according to claim 7, wherein the magnet holding portion is asymmetric with respect to the rotation direction.   10. The magnetic pole unit having the magnet holding part includes the magnetic pole part provided with the magnet holding part and the magnetic pole part not provided with the magnet holding part. The rotating electrical machine according to any of the above.   The armature winding includes a first U-phase winding, a first V-phase winding, a first W-phase winding, a second U-phase winding, and a second V-phase winding. A second W-phase winding, wherein the first U-phase winding, the first V-phase winding, and the first W-phase winding are connected to a first inverter; 11. The U-phase winding, the second V-phase winding, and the second W-phase winding are connected to a second inverter. 11. Rotating electric machine.   An electric power steering apparatus equipped with the rotating electrical machine according to any one of claims 1 to 11.

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