A four-degree-of-freedom bearingless permanent magnet motor for a flywheel battery

Abstract

The invention discloses a four-freedom-degree bearingless permanent magnet motor for a flywheel battery. An external stator consists of a left stator, a torque winding stator, and a right stator, wherein the yoke parts of the above three parts are connected from the left to the right in the axial direction. The left stator and the right stator are arranged in a lateral symmetry manner relative tothe torque winding stator. The teeth of the left and right stators are wound by a suspended winding, and the teeth of the torque winding stator is wound by a torque winding. A left permanent magnet ring is embedded at the center of a yoke part between the teeth of the left stator and the teeth of the torque winding stator, and a right permanent magnet ring is embedded at the center of a yoke partbetween the teeth of the right stator and the teeth of the torque winding stator. A magnetic isolation aluminum sleeve fixedly sleeves the exterior of the center of the suspended rotor, and is coaxially and fixedly sleeved by a torque rotor core. The external surface of the torque rotor core is uniformly provided with four arc-shaped torque rotor permanent magnets in the peripheral direction. Thesuspended winding and the torque winding are separated, and the lateral swinging motion of a rotating shaft of the flywheel battery is directly adjusted through the radial forces generated by the leftand right stators.

Description

technical field [0001] The invention relates to the technical fields of a bearingless motor and magnetic suspension, and is a bearingless permanent magnet motor mainly suitable for a flywheel battery of an electric vehicle with high speed and compact space. Background technique [0002] The traditional bearingless permanent magnet motor for flywheel batteries is mainly composed of two sets of windings: a stator, a rotor, and a torque winding and a suspension force winding with a difference in the number of pole pairs. By controlling the current in the two sets of windings, two sets of different magnetic fields are generated, thereby At the same time, the self-suspension and rotation of the rotor are realized. However, there are several shortcomings in the traditional bearingless permanent magnet motor for flywheel batteries: 1. It can only distribute the radial force evenly along the axial direction, and can only limit the two degrees of freedom in the horizontal and vertica...

AI Technical Summary

Problems solved by technology

However, there are several shortcomings in the traditional bearingless permanent magnet motor for flywheel batteries: 1. It can only distribute the radial force evenly along the axial direction, and can only limit the two degrees of freedom in the horizontal and vertical directions, and cannot adjust the motor along the rotating shaft. lateral motion on

2. The coupling between the torque magnetic field and the levitation magnetic field is high, and the response of the levitation force control is slow

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