Magnetic suspension bearing control power amplification integrated system

Abstract

The invention discloses a magnetic suspension bearing control power amplification integrated system. An FPGA chip is used as a core processor. The system comprises an FPGA control circuit (1), a full bridge circuit and an isolation driving part thereof (2) and an analog-to-digital conversion circuit (3). The analog-to-digital conversion circuit (3) converts a rotor displacement feedback signal (32) which is provided by a displacement sensor on a magnetic suspension bearing and a coil current feedback signal (31) which is provided by a coil current sensor into digital signals, and transmits the digital signals to the FPGA control circuit (1); and the FPGA control circuit (1) performs digital calibration and the operation of a suspension PID control algorithm, a current PD correction algorithm and a three-level pulse width modulation algorithm on the digital signals to generate multi-path switching signals, and controls the coil current through the full bridge circuit and the isolation driving part thereof (2). The FPGA control circuit (1) integrates a suspension controller, a power amplifier stage controller and the function of conditioning the current and displacement signal, fully utilizes the logical resources in the chip and reduces the circuit volume and power consumption.

Description

technical field [0001] The invention relates to a suspension controller and a power amplifier applied to a magnetic suspension bearing, especially a magnetic suspension bearing for spaceflight. Background technique [0002] Magnetic suspension bearings use electromagnetic force to suspend the rotor, which has the characteristics of no friction, long life, high speed, high precision, etc. It is the basic component for the development of high-precision CNC machining equipment. The levitation controller and power amplifier are the key technologies of the magnetic levitation bearing, which play a decisive role in the speed, precision and power consumption. [0003] The magnetic levitation flywheel attitude control system using the magnetic levitation bearing technology is one of the hot research topics in the aerospace field. Aerospace products have high requirements on weight and power consumption, so reducing the weight and power consumption of the magnetic suspension bearing...

AI Technical Summary

Problems solved by technology

This solution only has the function of the magnetic suspension bearing power amplifier, and needs to be used in conjunction with the bearing rotor suspension controller, and the circuit integration level is not high

In addition, the MOSFETs in the full-bridge circuit of the invention all use N-type MOSFETs, and the source of the MOSFET on the upper bridge arm needs to provide a floating bias voltage, and the signal obtained by the sensor sampling needs to be calibrated by the operational amplifier circuit, and the circuit volume is relatively small. Big

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