A power supplying system for a magnetic bearing and a control method thereof

Abstract

A power supplying system for a magnetic bearing and a control method thereof are disclosed. The system includes a rectifier filter circuit (1), a power acquiring circuit (9) and a DC-DC power supply (2), wherein the rectifier filter circuit (1) performs rectification and filtration treatment on an alternating current input power source to obtain a first direct-current busbar voltage; then the first direct-current busbar voltage is divided into two parts; one part supplies power to a motor controller (5) of a motor (6) of the magnetic bearing; the power acquiring circuit (9) acquires power fromthe other part of the first direct-current busbar voltage to obtain a second direct-current busbar voltage; the second direct-current busbar voltage is in an allowable input voltage range of the DC-DC power supply (2); and the DC-DC power supply (2) converts the second direct-current busbar voltage into a third direct-current busbar voltage and supplies power to a bearing controller (4) of the magnetic bearing (3). The system and the method can overcome poor power supply stability, a complex structure, poor reliability, and other defects in the prior art, and achieve good power supply stability, a simple structure and good reliability.

Description

technical field [0001] The invention belongs to the technical field of motors, and in particular relates to a magnetic suspension bearing power supply system and a control method thereof. Background technique [0002] Magnetic bearing (Magnetic Bearing) is to use magnetic force to suspend the rotor in the air, so that there is no mechanical contact between the rotor and the stator. In the power supply design of the magnetic suspension bearing system, one of the most critical reliability issues that needs to be solved is how to maintain the suspension of the shaft until the shaft stops rotating in the case of a sudden power failure when the motor is running at high speed. [0003] In a motor power control system for magnetic suspension bearings, the low-voltage power supply of the bearing controller is provided by a DC-DC power supply, while the power supply of the inverter module in the bearing controller is directly provided by the DC bus voltage of the main power supply. ...

AI Technical Summary

Problems solved by technology

[0005] The object of the present invention is to provide a magnetic suspension bearing power supply system and its control method in view of the above defects, so as to solve the problem that the power supply of the inverter module in the bearing controller in the prior art is directly provided by the DC bus voltage of the main power supply, resulting in stable power supply To solve the problem of poor performance and achieve the effect of improving the stability of power supply

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