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Inverse Salient Axial Parallel Multiphase Permanent Magnet Fault Tolerant Motor

A permanent magnet fault-tolerant, salient-pole technology, applied to synchronous motors with stationary armatures and rotating magnets, synchronous machine parts, magnetic circuit rotating parts, etc., can solve the mutual constraints between normal operating performance and fault tolerance, etc. problems, achieve excellent normal operation performance and fault-tolerant operation capability, reduce permanent magnet flux, and improve efficiency distribution characteristics

Active Publication Date: 2021-06-15
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the problem of mutual restriction between normal operation performance and fault tolerance ability in traditional multiphase permanent magnet fault-tolerant motors, and to provide an anti-saliency axial parallel multi-phase permanent magnet with excellent operation performance and fault tolerance ability fault tolerant motor

Method used

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  • Inverse Salient Axial Parallel Multiphase Permanent Magnet Fault Tolerant Motor
  • Inverse Salient Axial Parallel Multiphase Permanent Magnet Fault Tolerant Motor
  • Inverse Salient Axial Parallel Multiphase Permanent Magnet Fault Tolerant Motor

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Experimental program
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Effect test

specific Embodiment approach 1

[0025] Specific implementation mode one: the following combination Figure 1 to Figure 4 Describe this embodiment, this embodiment includes a rotating shaft 1, a first bearing 2, a left end cover 3, a rotor 4, a casing 5, a stator 6, a right end cover 7 and a second bearing 8,

[0026] The stator 6 is fixed on the inner side wall of the casing 5, the rotor 4 is fixed on the rotating shaft 1, and the rotating shaft 1 is respectively rotated and fixed on the left end cover 3 and the right end cover 7 through the first bearing 2 and the second bearing 8, and the left end cover 3 and the right end cover The cover 7 is respectively fixed on the left and right ports of the casing 5, and there is a radial air gap L between the rotor 4 and the stator 6;

[0027] The stator 6 is composed of a stator core 6-2 and an m-phase stator winding 6-1. The stator winding 6-1 is a multi-phase fractional slot concentrated winding, and the windings of different phases meet the electrical, magnetic,...

specific Embodiment approach 2

[0042] Embodiment 2: The difference between this embodiment and Embodiment 1 is that a short-circuit fault occurs in a certain phase winding in the m-phase stator winding 6-1, and the faulty phase winding is connected to the fault phase winding through a multi-phase full-bridge inverter. end short circuit, and simultaneously control the current in the remaining m-1 phase normal windings in the stator winding 6-1, and control the magnetic states of the p first permanent magnets 4-1 and the p second permanent magnets 4-8, Reduce the operating points of the p first permanent magnets 4-1 and p second permanent magnets 4-8, or even make them magnetized in reverse, reduce the size of the permanent magnetic field in the air gap, and then suppress the failure phase winding short circuit current.

Embodiment

[0044] Taking a five-phase motor as an example, in the normal operating state, the direct axis current i d During =0 control, the stator windings A, B, C, D, E of its stator 6 communicate with the amplitude as I m , the angular frequency is ω, and the initial phase angle is The five-phase symmetrical sinusoidal current i A , i B , i C , i D , i E ,Right now

[0045]

[0046]

[0047]

[0048]

[0049]

[0050] Assuming that a short-circuit fault occurs in the A-phase winding, the remaining four-phase normal windings are controlled to pass the following current:

[0051]

[0052]

[0053]

[0054]

[0055] Among them, the intermediate variable

[0056]

[0057] In the formula: R 0 is the short-circuit phase winding resistance; L 0 is the inductance of the short-circuit phase winding; N is the number of turns of the motor winding; k dp is the motor winding factor; Φ pm-D is the permanent magnetic flux coupled with the short-circuit pha...

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Abstract

The invention relates to an anti-saliency axially parallel multi-phase permanent magnet fault-tolerant motor, which belongs to the field of permanent magnet fault-tolerant motors. The invention solves the problem of mutual restriction between normal operation performance and fault-tolerant capability in traditional multi-phase permanent magnet fault-tolerant motors. The rotor of the present invention includes two adjustable magnet permanent magnet units and a non-adjustable magnet permanent magnet unit, the three are arranged side by side on the rotating shaft, and the two adjustable magnet permanent magnet units with the same structure are respectively fixed on the non-adjustable magnet permanent magnet unit On the end faces of the left and right sides, the two adjustable magnet permanent magnet units are staggered with p permanent magnet poles and p ferromagnetic poles along the outer circumference, and the magnetic poles of the two adjustable magnet permanent magnet units are staggered along the circumferential direction by 180 / p degree; the motor direct axis reactance is greater than the quadrature axis reactance; by adjusting the current in the stator winding to change the working point of the permanent magnets of the two adjustable magnetic permanent magnet units to change the magnitude or direction of the magnetic flux, and then realize two adjustable The permanent magnetic unit superimposes the permanent magnetic field of the non-adjustable magnetic unit in the air gap L in a forward or reverse direction.

Description

technical field [0001] The invention belongs to the field of permanent magnet fault-tolerant motors. Background technique [0002] Permanent magnet motors are widely used in many fields such as electric vehicles and wind power generation due to their advantages of high efficiency and high power density. Compared with the traditional three-phase permanent magnet synchronous motor, the multi-phase permanent magnet fault-tolerant motor has good fault-tolerant operation ability because of its redundant phase number. Different from the traditional permanent magnet motor, when designing a multi-phase permanent magnet fault-tolerant motor, it is necessary to ensure that the electrical, magnetic, thermal and physical isolation conditions are met between the different phase windings. Only in this way can the faulty winding be separated when a fault occurs Effective isolation from other normal phase windings. At the same time, the current of other normal phase windings is controlled...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02K21/14H02K1/27H02K1/16H02K21/02
Inventor 隋义尹佐生郑萍王明峤刘法亮
Owner HARBIN INST OF TECH
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