A bearingless permanent magnet synchronous motor

Abstract

The invention discloses a bearingless permanent magnet synchronous motor. A cylindrical rotor is installed on the rotor shaft. The material of the rotor is a permanent magnet material. Grooves are arranged on the outer layer of the rotor, and coils are embedded in the grooves. If they are connected to form a short circuit, the coil is called a damping coil. Due to interference, load and other reasons, the centers of the stator and rotor cannot coincide when the bearingless motor is running, which affects its ability to run stably. After the damping coil is added to the rotor, when the rotor is eccentric, the magnetic flux density of the air gap magnetic field will change, and an induced current will be induced in the damping coil, which will affect the magnetic flux density of the air gap magnetic field. Under the action of the magnetic field, the electromagnetic force generated on the rotor always hinders the change trend of radial levitation force and unilateral magnetic pull force, which reduces the sensitivity of the motor to external interference and changes, and has better robustness , increase the stable suspension performance of the rotor, and improve the anti-interference ability of the motor when it is running.

Description

technical field [0001] The invention relates to a motor, in particular to a bearingless permanent magnet synchronous motor with damping. Background technique [0002] Bearingless motor, also known as self-bearing motor, is a highly mechatronic system whose concept was first proposed in the late 1980s. It integrates the magnetic circuit of the motor and the magnetic bearing (magnetic bearing), so that the two share the motor core, thereby realizing the suspension of the motor shaft. The bearingless motor has the advantages of compact structure, high critical speed, and low loss, and since the rotor and stator of the bearingless motor can operate without mechanical friction, the critical speed of the rotor is increased, and the friction power consumption is reduced. It has broad application prospects in many fields such as high-speed and ultra-high-speed motors, molecular centrifugal pumps, semiconductor production, artificial heart pumps, mechanical engineering, and flywheel...

AI Technical Summary

Problems solved by technology

However, during the high-speed operation of the bearingless permanent magnet synchronous motor with the existing structure, due to interference, load and other reasons, the centers of the stator and rotor cannot coincide when the bearingless motor is running, and sometimes even touch the backup bearing, which affects the rotor. Stable suspension running performance

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