Square wave and sine wave integrated control system for magnetic suspension permanent magnet motor

Abstract

The invention relates to a square wave and sine wave integrated control system for a magnetic suspension permanent magnet motor. The square wave and sine wave integrated control system comprises a core control part, a power driving part, a rotor position detection part, a motor energy feedback part and a power supply management part; the core control part comprises a DSP control unit, a signal input / output interface and a communication interface; the power driving part comprises an IGBT unit and a driving circuit, the rotor position detection part comprises a line counter electromotive force zero crossing point detection circuit and a voltage and current sampling circuit, the motor energy feedback part comprises a Buck control unit with wide voltage range input, and the power supply management part comprises an alternating current-to-direct current rectifier module and a direct current-to-direct current power supply isolation module. According to the invention, two functions of square wave control and sine wave control are realized in the same hardware system, the integrated design is compact in structure, and the integration level of the motor control system is improved; functions are comprehensive, and reliability can be enhanced; the system is easy to debug and flexible to implement, and effectively widens the application range of a single-function motor control system.

Description

technical field [0001] The invention relates to a square wave and sine wave integrated control system for a magnetic levitation permanent magnet motor, which realizes the square wave and sine wave integrated control in one system, and is suitable for rotating machinery related to magnetic levitation motor technology such as a magnetic levitation molecular pump and a magnetic levitation flywheel. , It is also suitable for industrial fields related to motor drives such as servo drives, blowers, and electric spindles. Background technique [0002] Compared with traditional motors (such as DC motors, AC synchronous motors, switched reluctance motors and asynchronous induction motors, etc.), permanent magnet motors have compact structure, high energy density, high operating efficiency, and good control characteristics. Excitation, and can be directly connected with high-speed rotating loads. Compared with mechanical bearings, magnetic suspension bearings are becoming more and mo...

AI Technical Summary

Problems solved by technology

[0005] The technical problem of the present invention is: to overcome the deficiency of the existing single function control system, design a square wave and sine wave integrated control system for magnetic levitation permanent magnet motor, make full use of hardware resources, realize two kinds of The control method enhances the integration and flexibility of the control system; in order to make the structure of the control system more compact, a position sensorless method is used to detect the rotor position information required for square wave control and sine wave control to enhance the reliability of the control system; considering the magnetic Due to the particularity of the bearing, in this invention, the delayed power supply function based on the total power supply of the motor energy feedback is designed to reduce the drop speed of the magnetic levitation motor and protect the motor body

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