A stator permanent magnet type outer rotor chip bearingless asynchronous motor

Abstract

The invention discloses a stator permanent magnet type outer rotor sheet-shaped bearingless asynchronous motor, which comprises an outer rotor iron core and an inner stator of the inner ring of the outer rotor iron core. The permanent magnet and the disc-shaped iron core bridge, the stator iron core is laminated on the left end surface of the cylindrical permanent magnet, the iron core bridge is laminated on the right end surface of the cylindrical permanent magnet, the axis of the stator core, the iron core bridge and the cylindrical permanent magnet Collinear, a stator slot is opened on the stator core, a torque winding and a suspension winding are arranged in the stator slot, and the radial length of the outer rotor core is greater than its axial thickness. The cylindrical permanent magnet provides static bias flux for the motor, and the levitation winding is powered by a DC power supply to provide levitation control flux for the motor. The levitation control flux adjusts the static bias flux and generates radial levitation force on the outer rotor.

Description

technical field [0001] The invention relates to the technical field of motor manufacturing, in particular to a compact structure, the number of pole pairs of torque windings and the number of pole pairs of suspension windings only need to meet P m ≠ P b Relationship, control is simple, suspension control, torque control are independent of each other, radial active suspension, and axial passive suspension of a stator permanent magnet outer rotor plate bearingless asynchronous motor. Background technique [0002] Bearingless motor has no friction, wear, no lubrication, and is easy to achieve higher speed and higher power operation. In particular, the bearingless asynchronous motor has the advantages of simple structure and manufacture, high rotor strength, and low cost. It is used in high-speed machine tool spindles. Motors, sealed pumps, centrifuges, compressors, high-speed micro hard drives and other series of high-speed direct drives have broad application prospects. ...

AI Technical Summary

Problems solved by technology

In this way, the ordinary bearingless motor is not only subject to many restrictions on the control strategy, but also has a very complicated structure.

When the axial length of the rotor of a bearingless motor is small compared to its diameter, the rotor is passively stable in the axial direction, and stable suspension only needs to control the two radial degrees of freedom of the rotor. This special bearingless motor is called a sheet Shaped bearingless motor has become one of the hotspots in the field of bearingless motor research today, and a variety of structural sheet bearingless permanent magnet motors have been studied. The existence of rotor permanent magnets leads to large reluctance in the magnetic circuit and high power consumption. , and the mechanical strength of the rotor is low, it is difficult to achieve higher speed and higher power operation

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