Sensorless self-adaptive phase-commutation error compensation method of magnetically suspended control moment gyroscope brushless direct-current motor

Abstract

The invention proposes a sensorless self-adaptive phase-commutation error compensation method of a magnetically suspended control moment gyroscope brushless direct-current motor. First, under the circumstance of considering phase-commutation errors, according to an expression of a three-phase counter electromotive force fourier series form and a direct-current bus voltage expression of the brushless direct-current motor, a direct-current bus voltage expression containing phase-commutation error information is derived; based on the expression, a state space equation is established, state variables containing the phase-commutation error information is expanded, and then an expansion state observer of a system is designed for observing lumped disturbances containing the phase-commutation error information; and finally, when a control system detects a phase-commutation point, the expansion state observer is used for estimating the phase-commutation errors and carrying out compensation on the phase-commutation error of the brushless direct-current motor. The running loss of the motor is reduced, the phase-commutation accuracy and efficiency of the brushless direct-current motor are improved, and the sensorless self-adaptive phase-commutation error compensation method can be used for implementing the high-precision motor phase-commutation control of a magnetically suspended control moment gyroscope high-speed rotor motor system.

Description

technical field [0001] The invention belongs to the field of frame magnetic levitation CMG motor servo system control, and specifically relates to a sensorless adaptive commutation error compensation method of a magnetic levitation control moment gyro brushless DC motor, which is used for the self-adaptive compensation of the commutation error of the brushless DC motor. It helps to improve the motor efficiency and reduce the loss of the brushless DC motor, realize the sensorless precise commutation of the brushless DC motor, and then realize the high-precision angular rate output of the control torque gyro. Background technique [0002] The inertial actuators for spacecraft attitude control mainly include control moment gyroscope (CMG) and inertial momentum wheel (IMW). Magnetic levitation control moment gyroscope has become the preferred actuator for spacecraft attitude control because of its advantages of large output torque, good dynamic performance and high control preci...

AI Technical Summary

Problems solved by technology

The main disadvantage of mechanical sensors is that once the sensor is damaged, the installation accuracy after repair will be greatly reduced, and in applications such as aerospace, it may not even be possible to disassemble and repair the motor

But this assumption is not very accurate, the air gap of maglev BLDC motor is much wider than that of mechanical bearing BLDC motor

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