A high-torque-density double-winding permanent magnet motor based on magnetic gear effect

By introducing fundamental and harmonic windings and modulation units into permanent magnet motors, the high-efficiency torque density of permanent magnet motors is improved, solving the problem that traditional permanent magnet motors cannot simultaneously utilize harmonics and fundamental waves to perform work, and reducing system cost and complexity.

CN116032046BActive Publication Date: 2026-05-01SOUTHEAST UNIV
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Patent Information

Application Number
CN202310051212.1
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2023-02-02
Publication Date
2026-05-01
Estimated Expiration
2043-02-02

AI Technical Summary

Technical Problem

Traditional permanent magnet motors cannot effectively utilize harmonics and conventional magnetic gear effects. Permanent magnet motors cannot simultaneously and efficiently utilize both harmonics and fundamental waves to perform work, which limits the potential for increasing torque density. Furthermore, existing solutions increase the cost and size of the motor system.

Method used

A high torque density dual-winding permanent magnet motor based on the magnetic gear effect is designed. The fundamental and harmonic windings are installed in semi-closed slots on the inner surface of the stator. Combined with a modulation unit and a permanent magnet rotor, the two sets of windings are driven by the same four-quadrant converter to achieve efficient utilization of the fundamental and harmonic magnetic fields. An independent modulation unit structure is adopted to reduce the magnetic reluctance of the magnetic flux path.

Benefits of technology

This improves the torque density of the permanent magnet motor drive system, reduces structural complexity and cost, enhances the utilization rate and mechanical strength of permanent magnet materials, and strengthens system reliability.

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Abstract

The application discloses a high-torque-density double-winding permanent magnet motor based on a magnetic gear effect and relates to the technical field of motors.The application comprises a stator core, a fundamental wave winding, a harmonic wave winding, a modulation unit and a permanent magnet rotor; a half-closed slot is formed in the inner surface of the stator core, two sets of windings which are not coupled and have different pole pairs are placed in the slot, one set of the windings is the fundamental wave winding, and the other set of the windings is the harmonic wave winding; the modulation unit is composed of non-magnetic blocks and magnetic blocks which are alternately arranged along a circumference, is connected with the inner surface of the stator core, and only an air gap exists between the modulation unit and the permanent magnet rotor; the permanent magnet rotor is a magnetic gathering type permanent magnet rotor and comprises a tangential excitation permanent magnet and a magnetic separation slot structure. The two sets of windings can efficiently utilize the harmonic magnetic field and the fundamental wave magnetic field, the independent modulation unit is adopted to realize the optimal modulation ratio of the motor, the single air gap structure is beneficial to improving the working magnetic density of the motor, and the torque density of the motor driving system is effectively increased.
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