Monotonic magnetic ring double-modulation type magnetic gear and hub motor for new energy automobile

By using monotonic magnetic ring double modulation magnetic gear design in the hub motor of new energy vehicles, using Z-type magnetic ring stator and permanent magnet arranged in Halbach, the problems of poor magnetic field modulation effect and low torque density are solved, and low speed is achieved The effects of high torque and high torque density.

CN119210086AActive Publication Date: 2024-12-27EAST CHINA JIAOTONG UNIVERSITY
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Patent Information

Application Number
CN202411732433.6
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-11-29
Publication Date
2024-12-27
Estimated Expiration
2044-11-29

AI Technical Summary

Technical Problem

The existing magnetic gears have problems such as poor magnetic field modulation effect, large device size and low torque density.

Method used

The dual modulation magnetic gear design of monotonic magnetic ring is adopted, including the inner rotor, the intermediate rotor and the outer rotor. The radial and axial modulation are achieved through the Z-type magnetic ring stator. The intermediate rotor acts as the input rotor to drive the inner and outer rotors to rotate, and uses the Halbach arrangement. The permanent magnet is magnetized to reduce magnetic leakage at the end of the permanent magnet.

Benefits of technology

The low-speed and high-torque effect is achieved, the structure is simplified, the magnetic field modulation effect and torque density are improved, the device volume is reduced, and the air gap magnetic field harmonics are improved.

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Abstract

The invention provides a monotonic magnetic ring double-modulation type magnetic gear and a hub motor used for a new energy automobile. The magnetic gear comprises an inner rotor, a Z-shaped magnetic ring adjusting stator, a middle rotor and an outer rotor. The inner rotor, the middle rotor and the Z-shaped magnetism adjusting ring stator are coaxially and sequentially nested from inside to outside to form a radial modulation coaxial magnetic gear structure, and the modulation mode is difference modulation; the middle rotor, the Z-shaped magnetic field adjusting ring stator and the outer rotor are coaxially and sequentially nested from bottom to top to form an axially-modulated coaxial magnetic gear structure, and the modulation mode is sum modulation; a radial air gap is formed between the inner rotor and the middle rotor, and an axial air gap is formed between the middle rotor and the outer rotor; the Z-shaped adjustable magnetic ring stator comprises a plurality of Z-shaped adjustable magnetic iron cores, the middle rotor serves as an input rotor, and the inner rotor and the outer rotor are driven to rotate through the modulation effect of the Z-shaped adjustable magnetic ring stator. The problems that in the prior art, the magnetic field modulation effect is poor, the device size is large, and the torque density of a magnetic gear is low can be solved.
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Citation Information

Patent Citations

  • Novel magnetic gear for two-way air-gap field

    CN104578689A

  • Driving device, laser measuring device, and mobile platform

    CN108496298A

  • Halbach array magnetic gear applying double-adjusting magnetic ring device

    CN115940573A

  • Outer-stator wind-driven generator

    CN203278577U

  • Electric railroad switch

    JP1998119778A

Cited By

  • Single-ring sum-difference dual-modulation three-rotor coaxial magnetic gear and new energy automobile hub motor

    CN120454430A

  • Multi-magnetic-circuit single-magnet-ring dual-modulation three-rotor coaxial magnetic gear and automobile hub motor

    CN120710328A

  • Multi-magnetic circuit monotonic magnetic ring dual-modulation three-rotor coaxial magnetic gear and automobile wheel hub motor

    CN120710328B

  • Monotonic magnetic ring double-rotor radial-axis composite modulation magnetic gear

    CN122348655A