Harmonic magnetic field drive motor

The harmonic magnetic field drive motor addresses volume and power density issues by optimizing stator and rotor configurations and air gap, achieving reduced size, weight, and cost through stable electromagnetic torque and ripple reduction.

JP7725705B2Active Publication Date: 2025-08-19NINGBO HENGSHUAI CO LTD
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Patent Information

Application Number
JP2024506877
Authority / Receiving Office
JP · JP
Patent Type
Patents
Current Assignee / Owner
Priority Date
2021-08-19
Filing Date
2022-08-18
Publication Date
2025-08-19
Estimated Expiration
2042-08-18

AI Technical Summary

Technical Problem

Existing motors, particularly those using rare earth permanent magnets, face challenges in reducing volume and improving power density while minimizing material costs, especially for rare earth materials.

Method used

A harmonic magnetic field drive motor design with specific configurations of stator grooves, rotor magnet poles, and winding phases, along with a small air gap, to achieve stable electromagnetic torque and reduced tooth gap torque ripple, utilizing a BLDC or PMSM control method.

Benefits of technology

The design significantly reduces motor volume and weight by more than half, lowers material costs, and enhances power density, while maintaining control versatility with conventional control modules.

✦ Generated by Eureka AI based on patent content.

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Abstract

A, a number of tooth grooves are provided on the stator lamination piece, and the number of grooves is Z; B, in the 360° mechanical space around the stator, the stator winding is divided into m phases according to a predetermined connection rule; C, a stator unit (2) having a winding is individually provided in free space, a constant DC current is passed through the winding of any one of the phases, and the number of pole pairs of the phase winding magnetic field formed in the 360° mechanical space around the stator is Pm; D, the number of packages included in each phase winding is k=n×Pm (n=1, 2, 3...); E, in the circumferential direction, a permanent magnet roll The rotor magnet steel (13) is arranged in the order of N pole, S pole, and the number of pole pairs of the rotor magnet steel formed along the 360° mechanical space of the rotor circumference is Pr, F, and a motor air gap is formed in the combined space of the 360° mechanical space of the stator and rotor circumference. The number of pole pairs Pr of the rotor magnet steel of the harmonic magnetic field driving motor must satisfy Pr = Z ± Pm, and the number of stator grooves Z of the harmonic magnetic field driving motor is Z = 2 × m × k.
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Citation Information

Patent Citations

  • Multipolar generator

    JP2000060092A

  • Motor

    JP2019187047A

  • Hybrid dual-rotor structure

    US20170104398A1