Magnetic suspension permanent magnet motor with axial active and radial passive suspension decoupling magnetic circuit

By designing a magnetic levitation permanent magnet motor with decoupled axial active and radial passive levitation, the problem of unstable axial levitation of the magnetic levitation motor during high-speed rotation was solved. Independent control of rotor axial levitation and torque output was achieved, improving the motor's axial levitation performance and load-bearing capacity, and reducing costs.

CN122137265APending Publication Date: 2026-06-02NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
Filing Date
2026-02-04
Publication Date
2026-06-02

AI Technical Summary

Technical Problem

Existing magnetic levitation motors suffer from unstable axial suspension during high-speed rotation, resulting in insufficient rotor axial stiffness, which affects suspension stability and axial load-bearing capacity. Furthermore, their complex structure and high cost limit their application in high-speed rotating machinery.

Method used

The magnetic levitation permanent magnet motor adopts an axial active and radial passive suspension decoupling type. Through the combined design of axial stator disk assembly, motor unit and axial stator sleeve, it utilizes axial suspension winding and radial permanent magnet to generate active and passive suspension forces, realize the natural decoupling of rotor axial suspension and torque output, and adjust the axial air gap magnetic flux density to flexibly control the axial suspension force.

Benefits of technology

It achieves improved stability and axial load capacity of rotor axial suspension, has a simple structure and low cost, is suitable for high-speed operation, reduces the amount of permanent magnet material used, and improves motor torque density and power density.

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Abstract

This invention discloses a magnetically decoupled permanent magnet motor with axial active and radial passive levitation, belonging to the field of magnetic levitation motor technology. The magnetic levitation motor includes an axial stator disk assembly, an axial stator sleeve, and a motor unit. The motor unit has a radial air gap, and an axial air gap exists between the motor unit and the axial stator sleeve. The axial air gap contains axial bias flux and axial control flux, while the radial air gap contains torque flux. The rotor's axial translational degree of freedom is actively controlled, while the four radial degrees of freedom are passively stabilized. The axial levitation force and torque are naturally decoupled and independently controlled. The rotor in the motor unit of this invention adopts a "V"-shaped alternating pole structure with built-in permanent magnets, and the rotor core has air magnetic barriers, which improves the utilization rate of permanent magnet materials and the motor's torque output capability, while reducing costs.
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