Rotor gravity unloading type magnetic bearing composite motor

Abstract

The invention discloses a rotor gravity unloading type magnetic bearing composite motor comprising an external stator, an armature winding, a permanent magnet, a rotor, a magnetic isolation aluminum ring, an internal stator and a suspension control winding. The armature winding is wound in external stator slots. The magnetic isolation aluminum ring is embedded in the rotor. A Halbach type permanent magnet array is surface-mounted on the surface of the rotor. The internal stator has seven internal stator poles including two opposite bias flux magnetic poles, four radial suspension control poles and one gravity direction rotor weight unloading pole. Radial magnetized permanent magnets are surface-mounted on the surface of the bias flux magnetic poles. The suspension control winding is wound on the four suspension control poles. Coupling between the suspension winding and the armature winding in the conventional magnetic suspension motor can be eliminated, and the influence of the rotor weight on suspension control in the conventional suspension motor can also be greatly solved so that the rotor is enabled to stably work at the central balance position without increasing suspension control current, and low power consumption and stable suspension of the magnetic bearing composite motor can be realized.

Description

technical field [0001] The invention belongs to the field of wind power generation, in particular to a rotor gravity unloading type magnetic bearing composite motor. Background technique [0002] The long-term stable and reliable operation of the rotor is one of the key issues for the stable operation of the motor. At present, the commonly used supports include mechanical bearings, air bearings and magnetic bearings. Mechanical bearings are directly connected to the rotating shaft, which has problems such as severe wear and short service life; air bearings also have complex gas paths and poor support rigidity; magnetic bearings use current or permanent magnets to generate corresponding electromagnetic forces on the rotating shaft, which can realize non-contact rotors It has high reliability, no mechanical wear, no lubrication, and can adapt to special environments such as high temperature, low temperature, and vacuum. [0003] According to the structural similarity between ...

AI Technical Summary

Problems solved by technology

[0008] The invention proposes a rotor gravity unloading type magnetic bearing composite motor, which can well solve the problems of increased power consumption of the suspension motor caused by the gravity of the rotor, strong coupling between the suspension winding and the armature winding, and shorten the axial length of the motor at the same time. Realization of magnetic bearing composite motor with small size and low power consumption

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