A magnetic suspension bearing power supply system and its control method

Abstract

The invention discloses a magnetic suspension bearing power supply system and a control method thereof. The system comprises: a rectifying and filtering circuit (1), which rectifies and filters an AC input power supply, obtains the first DC bus voltage, and divides it into two circuits, one of which is The first DC bus voltage supplies power to the motor controller (5) of the motor (6) to which the magnetic suspension bearing belongs; the power-taking circuit (9) takes power from another first DC bus voltage to obtain the second DC bus voltage; the second DC bus voltage is within the allowable input voltage range of the DC-DC power supply (2); the DC-DC power supply (2) converts the second DC bus voltage into a third DC bus voltage, and Power is supplied to the bearing controller (4) of the magnetic suspension bearing (3). The solution of the present invention can overcome the defects of poor power supply stability, complex structure and poor reliability in the prior art, and realize the beneficial effects of good power supply stability, 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. ...

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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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