Two-degree-of-freedom stator permanent magnet biased permanent magnet bearingless motor

Abstract

The invention discloses a two-degree-of-freedom stator permanent magnet biased permanent magnet bearingless motor, and aims to overcome the shortcomings of an existing permanent magnet bearingless motor. The stator permanent magnet biased permanent magnet bearingless motor comprises a motor shell, a rotor and a stator are arranged in the motor shell, the stator comprises a stator core, a left pole core and a right pole core are symmetrically arranged on two sides of the stator core, a torque winding and a suspension winding are arranged in a stator slot of the stator core, an axial magnetized annular stator permanent magnet A and an axial magnetized annular stator permanent magnet B are axially arranged on two sides of the stator core, the rotor comprises a rotor core, and the rotor core is axially provided with a radial magnetized annular rotor permanent magnet and a rotating shaft. The stator permanent magnet biased permanent magnet bearingless motor is simple to control, realizes mutually independent suspension control and torque control, and can generate larger radial suspension force.

Description

technical field [0001] The invention relates to the technical field of motor equipment, in particular to a two-degree-of-freedom stator permanent magnet bias permanent magnet bearingless motor with simple control and greater radial levitation force. Background technique [0002] Bearingless motors have no friction, no wear, no lubrication, and are easy to achieve higher speed and higher power operation, especially the permanent magnet bearingless motors have simple structure, high operating reliability, small size, light weight and high efficiency. It has the advantages of high power density and other advantages, and has broad application prospects in the fields of flywheel energy storage, high-speed machine tool spindle motors and sealed pumps, centrifuges, compressors, and high-speed micro hard disk drive devices. [0003] At present, the existing permanent magnet type bearingless motor is superimposed on the torque winding of the stator slot of the traditional permanent m...

AI Technical Summary

Problems solved by technology

When selecting the thickness of the permanent magnet, it is necessary to comprehensively consider the mutual constraint relationship between the magnitude of the radial levitation force and the magnitude of the torque. Therefore, the generation of the radial levitation force is limited; at the same time, there is an Strong coupling requires a complex decoupling control strategy to decouple the rotation system and the suspension system, and the suspension force is closely related to the rotor position angle, so the existing permanent magnet bearingless motor has a relatively large radial suspension force. Disadvantages of small size, complex control and low precision

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