A Fault Tolerance System of Magnetic Suspension Control Moment Gyro High Speed ​​Rotor Inverter

Abstract

A fault tolerant topology structure of a high-speed rotor inverter of a magnetic suspension control torque gyroscope is mainly composed of a Buck DC-DC converter with a redundancy tube, a four-leg phase redundancy inverter, a fault protection circuit, a small armature and inductance permanent magnet brushless DC motor and the like. According to the characteristics of the small armature and inductance permanent magnet brushless DC motor, the redundancy topology structure is designed based on a motor drive circuit with the Buck DC-DC converter and a three-phase full-bridge inverter, reliability of a high-speed rotor drive circuit of the magnetic suspension control torque gyroscope is improved, and fault tolerant control is achieved after a power tube is disconnected or short-circuits; meanwhile, a drive system has the advantage of low power consumption before and after a fault happens, and the structure has high application value for spacecrafts paying attention to low power consumption and high reliability.

Description

technical field [0001] The invention relates to a fault-tolerant system of a magnetic levitation control moment gyro high-speed rotor inverter, which is used for the fault-tolerant control of a permanent magnet brushless DC motor with a small armature inductance, and is especially suitable for the high reliability of the driving parts of the attitude control actuators of satellites and space stations. control. Background technique [0002] Space applications require high precision, high torque, low power consumption, high reliability and long life for attitude control actuators. The magnetic levitation control moment gyroscope has the advantages of no friction and wear, no lubrication, long life, and high precision through active vibration control because its high-speed rotor is supported by magnetic levitation. It is an important attitude control actuator on the spacecraft. The high-speed rotor of the magnetic levitation control torque gyro is driven by a brushless DC moto...

AI Technical Summary

Problems solved by technology

However, for the Buck DC-DC converter plus three-phase full-bridge inverter structure, its fault performance is different from that of the traditional three-phase full-bridge inverter, specifically: the system cannot work after the Buck power tube fails open circuit; After the short-circuit fault of the power tube, the motor winding will over-current, which will cause the winding to burn out; after the single-circuit fault of the three-phase bridge power tube, the motor will run without phase, the current will increase, and the efficiency will decrease. Long-term operation may cause the system to overheat, which will cause Secondary fault; after a short-circuit fault of a single tube of a three-phase bridge power tube, due to the switching of the conduction logic, the faulty bridge arm will pass through, and the busbar will over-current instantaneously. Due to the closed-loop control of the current, the output voltage of the Buck DC-DC converter will drop rapidly At high speed, due to the existence of counter electromotive force, a circulating current will be generated inside the three-phase winding, which may burn the winding and cause secondary failure

Therefore, using the redundant topology for the traditional three-phase full-bridge inverter cannot achieve fault-tolerant control of the power tube failure of the Buck DC-DC converter

At the same time, due to different fault behaviors, Buck DC-DC converters plus three-phase full-bridge inverters will have unique overvoltage and internal circulation between windings after faults. If traditional fault switching methods are used, secondary faults may occur happened

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