Electric assist steering system having an improved motor current

Details Electric assist steering system having an improved motor current Electric assist steering system having an improved motor current

1998-03-20

2000-08-22

Sircus, Brian

Electricity: motive power systems

Positional servo systems

Adaptive or optimizing systems including 'bang-bang' servos

318623, 318629, 318432, G05B 1300

Patent

active

061077674

ABSTRACT:
A motor controller includes a summing circuit (186) for summing a motor current command signal (i.sub.rcmd) with a motor current feedback signal (i.sub.s) and for providing an error current command signal (.DELTA.i.sub.cmd) having a value functionally related to the difference between the motor current command signal and the motor current feedback signal. A notch filter (200) filters the error current command signal and provides a filtered current command signal. The notch filter (200) is adapted to notch out frequencies from the error current command signal about the resonant frequency of a motor (28). A drive circuit (120, 204) energizes the motor (28) in response to the filtered current command signal. A motor current sensor (97) is used for sensing motor current and providing the motor current feedback signal (i.sub.s).

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