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Rotating electric machine

A technology for rotating electrical machines and rotors, applied to synchronous motors with stationary armatures and rotating magnets, electromechanical devices, electrical components, etc., can solve problems such as large magnetic resistance, and achieve the effect of reducing high-harmonic iron loss

Pending Publication Date: 2022-06-21
MITSUBISHI ELECTRIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

By forming a cavity in the rotor core, the magnetic resistance in the d-axis direction of the rotor core increases

Method used

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  • Rotating electric machine
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0040] figure 1 It is a plan view showing the rotating electrical machine according to the first embodiment. The rotating electrical machine 1 is a permanent magnet type rotating electrical machine. The rotating electrical machine 1 includes a stator 2 and a rotor 3 that rotates with respect to the stator 2 . In this example, the axial direction refers to the direction along the axis of rotation of the rotor 3 , the radial direction refers to the radial direction centered on the axis of rotation of the rotor 3 , and the circumferential direction refers to the axis of rotation of the rotor 3 . the circumference. The rotor 3 is arranged radially inward with respect to the stator 2 . The rotor 3 rotates in the circumferential direction relative to the stator 2 .

[0041] The stator 2 includes a stator core 201 and a plurality of coils 202 provided in the stator core 201 . The stator core 201 includes a cylindrical core back 203 and a plurality of teeth 204 protruding radiall...

Embodiment approach 2

[0090] Figure 13 It is a plan view showing the main part of the rotor of the rotating electrical machine according to the second embodiment. exist Figure 13 In the figure, the part constituting one magnetic pole in the rotor 3 is shown. In the second magnetic slit 309B, the first magnet magnetic flux guide path 311 is arranged in the portion closest to the permanent magnet 308 . In Embodiment 2, the first magnet magnetic flux guide paths 311 are arranged at two locations of the second magnetic slit 309B. The magnetic flux from the permanent magnet 308 is guided to the first magnet magnetic flux guide path 311 . The other structures are the same as those of the first embodiment.

[0091] As described above, in the rotary electric machine 1 of the second embodiment, similarly to the first embodiment, the high-harmonic iron loss generated in the stator 2 can be reduced. In addition, first magnet magnetic flux guide paths 311 are formed at two locations of the second magnet...

Embodiment approach 3

[0093] Figure 14 It is a plan view showing the main part of the rotor of the rotating electrical machine according to the third embodiment. exist Figure 14 In the figure, the part constituting one magnetic pole in the rotor 3 is shown. In the first magnetic slit 309A, a second magnet magnetic flux guide path 313 is arranged in a portion facing the second magnetic slit 309B. In Embodiment 3, the second magnet magnetic flux guide paths 313 are arranged at two locations of the first magnetic slit 309A.

[0094] The second magnet magnetic flux guide path 313 connects the first q-axis magnetic circuit 310A to a portion of the rotor core 301 that is farther from the permanent magnet 308 than the first magnetic slit 309A. The second magnet magnetic flux guide path 313 guides the magnetic flux passing through the portion of the rotor core 301 between the first magnetic slit 309A and the second magnetic slit 309B to the rotor that is farther from the permanent magnet 308 than the ...

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PUM

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Abstract

The invention provides a rotating electric machine capable of reducing high harmonic iron loss generated in a stator. The rotating electric machine includes a stator and a rotor, and the rotor includes: a rotor core in which a magnet insertion hole group composed of a plurality of magnet insertion holes is formed; and a permanent magnet group which is inserted into the magnet insertion hole group and is composed of a plurality of permanent magnets. A first magnetic slit and a second magnetic slit are formed in the rotor core. A first magnet flux guide path connecting the first q-axis magnetic circuit and the second q-axis magnetic circuit is disposed in the second magnetic slit. When theta1 is an angle between a straight line passing through the first intersection point and the center point in the radial direction of the rotor core and a straight line passing through the second intersection point and the center point in the radial direction of the rotor core, P is the number of pole pairs, m1 is a natural number, and n1 is a natural number smaller than m1, theta1 = 2pi * n1 / {P * (2m1-1)} [rad] is satisfied.

Description

technical field [0001] The present invention relates to a rotating electrical machine provided with permanent magnets. Background technique [0002] Conventionally, there has been known a rotating electrical machine including a rotor and a stator, the rotor having a rotor core having a magnet insertion hole group formed of a plurality of magnet insertion holes formed thereon, and a permanent magnet group, The permanent magnet group is inserted into the magnet insertion hole group and is composed of a plurality of permanent magnets. The permanent magnet group constitutes one magnetic pole in the rotor. A cavity serving as a magnetic barrier is formed in a portion of the rotor core between the radially outer surface of the rotor core and the magnet insertion hole group. By forming a cavity in the rotor core, the magnetic resistance of the rotor core in the d-axis direction increases. Thereby, the salient pole ratio of the rotor increases. As a result, the reluctance torque...

Claims

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Application Information

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IPC IPC(8): H02K1/276
CPCH02K1/2766H02K21/14Y02T10/64H02K1/2706
Inventor 满田宇宙深山义浩枦山盛幸井上正哉中村成志
Owner MITSUBISHI ELECTRIC CORP
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