A vernier permanent magnet fault tolerant motor with asymmetric stator teeth

By designing the asymmetrical stator teeth and setting up the functional reuse unit, the problem of insufficient short-circuit resistance of the vernier permanent magnet motor under short-circuit faults is solved, and the high torque density and fault tolerance performance of the motor under normal operating conditions are improved.

CN119675291BActive Publication Date: 2026-05-01HUAZHONG UNIV OF SCI & TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
HUAZHONG UNIV OF SCI & TECH
Filing Date
2024-12-26
Publication Date
2026-05-01

AI Technical Summary

Technical Problem

Existing vernier permanent magnet motors have poor short-circuit resistance during short-circuit faults. Current technology cannot effectively suppress short-circuit current, which can lead to excessive local temperature rise in the motor and potentially cause equipment failure.

Method used

An asymmetrical stator tooth design is adopted, with stator slots including two types: open slots and closed slots, which are placed alternately. The tooth width of the closed slots is different from that of the adjacent stator teeth, and auxiliary grooves are set on the air gap surface of the closed slots to form a functional multiplexing unit. This unit changes the direction of the magnetic field lines under short-circuit faults, increases the slot leakage inductance and slot inductance reactance, and reduces the short-circuit current.

Benefits of technology

It significantly improves the motor's short-circuit withstand capability, significantly reduces short-circuit current, ensures high torque density and fault tolerance of the motor under normal operating conditions, and enhances the motor's ability to autonomously suppress short-circuit current.

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Abstract

The application discloses a vernier permanent magnet fault-tolerant motor with asymmetric stator teeth, and belongs to the field of fault-tolerant motors. The stator slot of the motor comprises two types of open slots and closed slots. The number of the open slots and the closed slots is equal, and the open slots and the closed slots are staggered. The tooth width of two stator teeth adjacent to the same closed slot is not equal. In a short-circuit fault condition, the difference between the magnetic conductance amplitudes corresponding to the two stator teeth adjacent to the same closed slot is increased, so that the magnetic lines originally passing through the long magnetic circuit and having to pass through the narrow teeth can change to pass through the wide teeth due to the increased magnetic resistance, the ability of the closed slot to guide the magnetic lines to form the ring-tooth magnetic circuit is enhanced, the ring-tooth magnetic circuit slot leakage inductance in the short-circuit fault condition is increased, and the short-circuit resistance of the motor is enhanced. At the same time, the coil winding span is closer to one pole pitch, the utilization rate of the winding to the rotor excitation magnetic field and the slot area are improved, and then the current flowing through the slots can be increased to ensure the high torque output of the motor in the normal condition.
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Citation Information

Patent Citations

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  • Variable impedance permanent magnet fault-tolerant motor

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