Variable link sensorless brushless direct current motor controller for space and hardened applications

摘要

A sensorless motor controller includes a variable link control, including a radiation-hardened field programmable gate array (FPGA) and a back electromotive force (EMF) decoder circuit. The back EMF decoder infers the position of a rotor of the motor. A filter on the decoder conditions the back EMF signal and has multiple cutoff frequencies which can be dynamically controlled by the FPGA in order to compensate for phase shift in the back EMF signal. The FPGA also controls a variable DC link and its digital speed control loop.

主权项

1. A motor controller system comprising:
a hardened field programmable gate array; a back electromotive force decoder circuit at least partially controlled by the field programmable gate array; a filter configured to condition a back electromotive force signal in the decoder circuit, the filter having at least one cutoff frequency, wherein the at least one cutoff frequency is continuously conditioned by the field programmable gate array to reduce phase shift of the back electromotive force signal; and a current limiter circuit configured to protect the motor, wherein the current limiter circuit is configured to respond separately to an average current and to a peak current.