A bearingless permanent magnet sheet motor with parallel injection of winding torque and current

Abstract

The invention discloses a winding torque current parallel injection type bearingless permanent magnet slice motor, which has a structure that a 4-pole permanent magnet in Halbach array structure is plastered tightly on the inner surface of an external rotor; a stator iron core comprises 6 armature teeth that are uniformly distributed in circumferential direction; each armature tooth is winded by a coil; two axisymmetric coils relative to an axle center are winded in opposite direction and the ends are connected together to form a phase winding; two coil midpoints of each phase winding have a center line and the outlet ends of the center lines are connected to a first current inverter; the first current inverters provide torque current for the windings; three starts of each phase winding are connected with a second current inverter; the second current inverter provides suspension force current and torque current for the windings at the same time; three ends of each phase winding connect to the neutral point commonly; the motor structure is more simple and compact, thereby raising suspension force control performance; and the power consumption at the stator side is smaller, thereby eliminating the influence to suspension force current component in the suspension force current inverter.

Description

technical field [0001] The invention relates to a bearingless motor, in particular to a single winding bearingless permanent magnet sheet motor, which is suitable for special electrical transmission fields such as biomedical engineering, chemistry, semiconductor and microelectronics. Background technique [0002] Most of the traditional bearingless motors realize active levitation with two degrees of freedom or four degrees of freedom. Other degrees of freedom still need magnetic bearing control. The axial length of the motor is longer and the volume is larger. Development of higher speeds is limited. The bearingless permanent magnet sheet motor can realize full suspension of five spatial degrees of freedom. By changing the amplitude and phase of the current of the suspension force winding, active suspension of two radial degrees of freedom can be realized, and three degrees of freedom (one axial and two torsional) for passive suspension. While inheriting the advantages of...

AI Technical Summary

Problems solved by technology

[0003] In the bearingless permanent magnet sheet motor, two sets of windings, torque and levitation force, are superimposed in the stator, which makes the mechanical structure of the motor complex. At the same time, the torque winding and the levitation force winding share the same magnetic circuit, and there is coupling between mutual influences, making the electromagnetic structure also complicated. more complicated

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