Permanent magnet fault-tolerant motor based on alternate tooth winding and unequal stator pitch

A permanent magnet fault-tolerant, stator tooth technology, applied in the direction of magnetic circuits, electromechanical devices, electrical components, etc., can solve the problems of difficult phase isolation design of motors, and achieve increased short-circuit current suppression ability and magnetic field weakening ability, short-circuit current suppression ability and The effect of enhanced field weakening capability, increased torque density and power density

Active Publication Date: 2020-07-28
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the phase-to-phase isolation of Ns’=2p’±1 motor is a design difficulty

Method used

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  • Permanent magnet fault-tolerant motor based on alternate tooth winding and unequal stator pitch
  • Permanent magnet fault-tolerant motor based on alternate tooth winding and unequal stator pitch
  • Permanent magnet fault-tolerant motor based on alternate tooth winding and unequal stator pitch

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Embodiment 1 Inner rotor motor

[0029] like figure 2 As shown, a permanent magnet fault-tolerant motor based on alternate-tooth windings and unequal stator pitches includes a stator 10 and a rotor 20 coaxially set, and the stator is set on the outer periphery of the rotor.

[0030] The pole-slot coordination of the permanent magnet fault-tolerant motor satisfies Ns'=2p'±1, where Ns'=Ns / t, p'=p / t, Ns is the number of stator slots, p is the number of rotor pole pairs, and t is Ns and p greatest common divisor of . like figure 2 For the 30-slot 28-pole motor shown, t=2, Ns=30, p=14. In addition, such as 9-slot 8-pole motor (t=1) and so on.

[0031] The stator has Ns / 3 fault-tolerant teeth 11 and 2Ns / 3 armature teeth 12, and the Ns / 3 fault-tolerant teeth are uniformly arranged along the inner circumference of the stator. exist figure 2 , with 10 fault-tolerant teeth and 20 armature teeth.

[0032] Two armature teeth are arranged between two adjacent fault-toleran...

Embodiment 2

[0047] Embodiment 2 Outer rotor motor

[0048] The rotor is coaxially sleeved on the outer circumference of the stator, and Ns / 3 fault-tolerant teeth are evenly arranged along the outer circumference of the stator, and the rest of the structure is the same as that of Embodiment 1.

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Abstract

The invention discloses a permanent magnet fault-tolerant motor based on an alternate tooth winding and an unequal stator tooth pitch. The stator has Ns / 3 fault-tolerant teeth and 2Ns / 3 armature teeth. The Ns / 3 fault-tolerant teeth are uniformly distributed along the inner circumference or the outer circumference of the stator. Two armature teeth are uniformly arranged between two adjacent fault-tolerant teeth and comprise an armature tooth 1 and an armature tooth 2. A large tooth slot is formed between the armature tooth 1 and the armature tooth 2. A small tooth slot is formed between each fault-tolerant tooth and the adjacent armature teeth 1 and 2. The volume of the large tooth slot is larger than the volume of the small tooth slot. An armature coil is wound around each armature tooth.The power direction of the armature coil on the armature tooth 1 is opposite to the power direction of the armature coil on the armature tooth 2. For a fractional slot motor with a high winding factorof Ns'=2p'+ / -1, by using a combination of the alternate tooth winding and the unequal stator tooth pitch, phase-to-phase isolation is achieved, thereby improving the fault tolerance of the motor, andincreasing the self-inductance in each phase so as to improve the short-circuit current suppression capability and weak magnetic capability.

Description

technical field [0001] The invention relates to the field of motor design, in particular to a permanent magnet fault-tolerant motor based on alternate-tooth windings and unequal stator pitches. Background technique [0002] In recent years, due to the advantages of high torque density, high power density and high efficiency, permanent magnet motors have been widely used in many fields such as home appliances, electric vehicles, wind power and aerospace. For applications with high safety and reliability requirements, the permanent magnet motor is required to have fault tolerance (that is, after a certain fault occurs in the motor, it can still operate with a certain performance and prevent further expansion of the fault). [0003] As described in the paper "Favourable slot and pole number combinations for fault-tolerant PM machines" published in IEE Proceedings - Electric Power Applications in 2004, the existing permanent magnet fault-tolerant motors are based on the pole-slo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02K1/14H02K1/27
CPCH02K1/146H02K1/2773H02K1/278
Inventor 李健郑蓉蓉王凯刘闯
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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