Salient pole degree reversible enhanced permanent magnet motor and design method thereof

By introducing multiple variable reluctance units and a specific magnetic barrier structure into the rotor, the design of a permanent magnet motor has solved the problems of narrow speed range and low efficiency in the high-speed range of automotive permanent magnet motors, and has achieved efficient operation of the motor under various operating conditions.

CN119864967BActive Publication Date: 2026-06-09NANTONG UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
NANTONG UNIV
Filing Date
2025-01-09
Publication Date
2026-06-09

AI Technical Summary

Technical Problem

Existing permanent magnet motors for vehicles have low efficiency in the wide speed range and high speed range, making it difficult to meet the performance requirements of electric vehicles under varying operating conditions.

Method used

The permanent magnet motor adopts a design with enhanced salient pole reversibility. By introducing multiple variable reluctance units into the rotor, combined with bread-shaped permanent magnets and trapezoidal and bulb-shaped magnetic barriers, the inductance can be reversibly adjusted by utilizing changes in armature current under different operating conditions, thereby widening the speed range and increasing the output torque.

Benefits of technology

It enhances the reversibility of the saliency rate of the motor under different operating conditions, meets diverse performance requirements, broadens the speed regulation range, and improves the output torque, thus meeting the requirements of complex operating conditions of electric vehicles.

✦ Generated by Eureka AI based on patent content.

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Abstract

The application relates to the technical field of permanent magnet motors, in particular to a saliency ratio reversible degree enhanced permanent magnet motor and a design method thereof. The permanent magnet motor comprises a rotating shaft, a rotor sleeved on the rotating shaft, and a stator coaxially sleeved on the outside of the rotor. Eight trapezoidal magnetic barriers with the centers on q axes and eight bread-type permanent magnets with the centers on d axes are staggeredly embedded in the rotor along the circumferential direction. The bread-type permanent magnets are magnetized along the thickness directions and the magnetization directions are opposite. A bulb-type magnetic barrier in contact with the bread-type permanent magnet is arranged on the two sides of each bread-type permanent magnet. The application ingeniously introduces multiple variable magnetic resistances in the rotor by changing the armature current under different working conditions, instead of a single magnetic resistance, so that the target of enhancing the saliency ratio reversibility under all working conditions is achieved while the magnetic flux leakage and the effective magnetic flux of the motor are changed, and the performance requirements of different working conditions can be met.
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