Closed loop control system and method using back EMF estimator

Details Closed loop control system and method using back EMF estimator Closed loop control system and method using back EMF estimator

1994-08-31

1996-12-31

Ip, Paul

Electricity: motive power systems

Positional servo systems

With protective or reliability increasing features

318610, 318574, 318565, 244191, G05B 903

Patent

active

055897495

ABSTRACT:
A feedback control system which uses estimated back electromotive force(EMF) from a controlled actuator to provide feedback into the control system and improve control of the actuator. Back EMF is estimated from current through the actuator and voltage across the actuator. The estimated back EMF signal is fed back into the control system where it serves as a rate term. In the preferred embodiment the back EMF signal is used in combination with an actuator position signal which is also feedback into the control system. A complementary filter conditions both the rate and position signals for improved performance. The invention is particularly suited for controlling linear actuators which do not provide conventional rate feedback signals.

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