A five-degree-of-freedom ultra-high-speed bearingless permanent magnet motor

By integrating magnetic levitation bearings and permanent magnet motors, and using passive permanent magnet bearings and suspended winding control, the problems of mechanical bearing wear and magnetic levitation bearing length of ultra-high speed motors at high speeds are solved, achieving stable operation and structural simplification.

CN115733323BActive Publication Date: 2025-07-22TIANJIN UNIV
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Patent Information

Application Number
CN202211419075.4
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Priority Date
2022-09-09
Filing Date
2022-11-14
Publication Date
2025-07-22
Estimated Expiration
2042-11-14

AI Technical Summary

Technical Problem

Ultra-high-speed motors are prone to wear at high speeds, the air bearings have poor anti-interference ability, and the magnetic levitation bearings have a long axial length, which limits the development of the motor and increases the system complexity and cost.

Method used

A five-degree of freedom ultra-high-speed bearingless permanent magnet motor is designed to integrate magnetic levitation bearings with permanent magnet motors, and passive permanent magnet bearings and suspended windings to achieve five-degree of freedom control, simplifying the structure and shortening the axial length.

Benefits of technology

It realizes stable operation of the motor at high speeds, improves rotor stiffness and critical speed, simplifies the structure, and reduces system complexity and cost.

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Abstract

The present invention relates to a five-degree-of-freedom ultra-high-speed bearingless permanent magnet motor. Both ends of a cylindrical solid permanent magnet are respectively connected to a rotating shaft. A casing is installed outside the cylindrical solid permanent magnet. A stator core is fixedly installed on the casing. A set of torque windings is embedded in the bottom layer of the stator core, and two sets of suspension windings are embedded in the upper layer of the stator core. End covers are fixedly installed on both sides of the casing. Auxiliary bearings are installed between the end covers and the rotating shaft. Passive permanent magnet bearings are nested on both the end covers and the rotating shaft. The present invention is reasonably designed, integrating a magnetic suspension bearing and a permanent magnet motor into one. While the motor generates an electromagnetic torque capable of driving the rotor to rotate, it can also generate a radial suspension force to overcome the rotor gravity and unilateral magnetic pull force, simplifying the motor structure and shortening the axial length of the motor. The double suspension windings and the axial passive permanent magnet magnetic bearing achieve five-degree-of-freedom control, increasing the rotor stiffness and critical speed of the ultra-high-speed motor, and improving the operation stability and anti-disturbance ability.
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