A high-power double-rotation brushless DC motor overcurrent protection device

Abstract

The invention relates to a high-power double-rotation brushless DC motor overcurrent protection device, which is characterized in that: the input terminal of the Hall current sensor is a phase current signal, and its output terminal is serially connected with a differential isolation operational amplifier circuit and a DC bias circuit and a limiting filter circuit, the output end of the limiting filter circuit is serially connected to a comparator and its bias circuit, and the other input terminal of the comparator and its bias circuit is connected to the output end of the shutdown voltage generating circuit; the present invention adopts high-precision The phase current sampling circuit improves the sampling accuracy of the motor current, has strong anti-interference ability, and improves the driving ability and electromagnetic compatibility of the system at the same time; the shutdown voltage generation circuit and shutdown signal generation circuit can accurately and timely ensure that the motor is in abnormal operation The emergency treatment in case of emergency improves the reliability and stability of the system work.

Description

technical field [0001] The invention belongs to the field of brushless direct current motor control, and relates to a high-power double-rotation brushless direct current motor overcurrent protection device. Background technique [0002] High-power brushless DC motors have the advantages of high operating efficiency, good speed regulation performance, and high reliability. In many fields such as aviation, aerospace, and navigation, high-power brushless DC motors can be used as propulsion actuators. The double-shaft counter-rotating brushless DC motor is designed based on the principle of action force and reaction force. Under the promotion of electromagnetic torque, the inner and outer rotors rotate in opposite directions at the same time. This dual-axis counter-rotating brushless DC motor is mainly used in underwater dual-axis counter-rotating propulsion systems, which can effectively prevent the occurrence of rolling and significantly improve the propulsion efficiency of un...

AI Technical Summary

Problems solved by technology

[0003] The existing commonly used current detection circuit basically directly samples the motor current, and because the brushless DC motor adopts electronic commutation and PWM modulation, there are inevitably commutation ripples and PWM modulation ripples during operation, and its current has peak fluctuations and high Frequency interference; at the same time, because the inner and outer rotors of the high-power double-rotation brushless DC motor are rotating, the system operation is more complicated. The above reasons make the existing direct detection motor current circuits have low precision, large delay, low reliability, and high power consumption. And other issues

[0004] The rated current of the high-power brushless DC motor is relatively large during operation. If the current protection circuit of the control system is unreliable, it may damage the drive inverter circuit and the motor body, resulting in serious consequences such as the failure of the control system to work normally.

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