Electromagnetic actuator system

Details Electromagnetic actuator system Electromagnetic actuator system

H - Electricity

02

P

318/18, 354/25

H02P 8/00 (2006.01) H02P 8/22 (2006.01) H02P 25/08 (2006.01)

Patent

CA 1223632

ELECTROMAGNETIC ACTUATOR USING STEPPER MOTOR WITH CLOSED LOOP POSITION SENSING, ELECTRONIC COMMUTATION AND DYNAMIC POSITION AND ANOMALY CORRECTION ABSTRACT OF THE DISCLOSURE Using as an actuator a stepper motor operated in a position-sensed closed loop mode via an electronic commutator by position and anom- aly corrected motion control signals provided by a programmable logic array and by a microprocessor, provides a precision power positioner. The correct enabling of the motor coils, based on position sensing of the motor phase, using electronic commutation for the stepper motor, transforms the problem of enabling coil selection to the programmable logic array, which by its logic provides a simplified operating control as a function of present armature position feedback, and by a micro- processor corrects for anomalies such as temperature rise, square-law, and phase increase as a function of position desired and present arma- ture position feedback signals, and thus provides high positional accu- racy, high speed and force (torque) control independent of the motor cardinal step positions. A standard three phase magnetic resistor sen- sor is used both to sense the motor phase and to feed back the motor position to the microprocessor for calculation of corrections; actual control of the stepper motor is communicated as a single amplitude modulated control signal.

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