Annular concentrated winding three-degree-of-freedom high-speed magnetic suspension motor and control method thereof

By using a three-degree-of-freedom high-speed magnetic levitation motor with a ring-shaped concentrated winding, the problem of insufficient axial levitation force in magnetic levitation motors is solved, and axial and radial levitation decoupling is achieved, simplifying the motor structure and control system, making it suitable for high-speed and high-power-density applications.

CN122137266APending 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
2026-03-20
Publication Date
2026-06-02

AI Technical Summary

Technical Problem

Existing magnetic levitation high-speed motors suffer from insufficient axial levitation force, complex structure, high copper loss, difficulty in winding, significant harmonics in the stator internal magnetic field, and large pulsation in the air gap magnetic field, which limits their application in high-speed, high-power-density, and miniaturized fields.

Method used

A three-degree-of-freedom high-speed magnetic levitation motor with a ring-shaped concentrated winding is adopted, including a motor stator unit, a rotor unit and a magnetic bearing stator unit. The permanent magnet of the rotor provides a permanent magnet field and an axial levitation winding, thereby achieving decoupling of axial and radial levitation and simplifying the control system.

Benefits of technology

It achieves a short axial length, compact radial structure, good axial suspension performance, low torque pulsation, high power density, and is suitable for high-speed operation. The control is simple and reliable, and it is applicable to aerospace and industrial production.

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Abstract

This invention discloses a three-degree-of-freedom high-speed magnetic levitation motor with a ring-shaped concentrated winding and its control method. The magnetic levitation permanent magnet motor includes a stator unit, a first air gap, a rotor unit, a second air gap, and a magnetic bearing stator unit. The stator unit is a modular slotless structure, employing a single ring-shaped concentrated winding to simultaneously control radial levitation and rotor rotation, resulting in a simple structure and high space utilization. The first air gap contains a torque magnetic field and a radial levitation magnetic field, while the second air gap contains an axial bias magnetic field and an axial control magnetic field. Axial levitation is decoupled from radial levitation and torque output, resulting in good axial levitation performance and strong axial load-bearing capacity. In the control method, axial levitation and torque output are controlled independently, and rotor rotation does not affect axial levitation performance, simplifying the motor control system. In this invention, axial levitation and radial levitation control are independent of each other, and the radial levitation control method is flexible and highly reliable.
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