Stator permanent magnet-biased sheet-shaped inner-rotor bearingless asynchronous rotor

Abstract

The invention discloses a stator permanent magnet-biased sheet-shaped inner-rotor bearingless asynchronous rotor. The stator permanent magnet-biased sheet-shaped inner-rotor bearingless asynchronous rotor comprises a stator and a rotor, wherein the rotor is arranged in an inner circle of the stator, the stator comprises a stator core, an axially-magnetized annular permanent magnet and an iron corebridge, a stator groove is formed in the stator core, a suspension winding and a torque winding are arranged in the stator groove, a T-shaped cylindrical boss is arranged at a middle part of the ironcore bridge and protrudes inwards, the rotor is a hollow thin circular post, an outer side air gap exists between the rotor and the stator core, an inner side air gap exists between the rotor and theT-shaped boss, a rotor groove is formed in a surface of the outer side air gap of the rotor, a guide strip is casted into the groove or a winding is wound around the groove, and the pole pairs of thewinding are different from those of the suspension winding. The stator permanent magnet-biased sheet-shaped inner-rotor bearingless asynchronous rotor is compact in structure and is simple to control, no coupling is generated between a suspension force and torque, and axial passive control and radial active control are performed.

Description

technical field [0001] The invention relates to the technical field of motor manufacturing, in particular to a bearing-less asynchronous stator permanent magnet bias plate inner rotor with compact structure, simple control, independent suspension control and torque control, radial active control, and axial passive control motor. Background technique [0002] At present, the bearingless asynchronous motor is by superimposing an additional set of suspension windings on the torque winding of the stator slot of the traditional asynchronous motor, and the two sets of windings are respectively powered by a three-phase AC power supply with the same frequency to generate the rotating suspension winding magnetic field and torque. The winding magnetic field, and the number of pole pairs of the suspension winding magnetic field is P B , the torque winding magnetic field is P M , between the two only satisfy P B = P M When the relationship between ±1, the stable and controllable...

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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