Electromagnetic actuator system

Abstract

Abstract Using as an actuator a stepper motor (11,12) operated in a position-sensed closed loop mode via an electronic commutator by position and anomaly corrected motion control signals provided by a programmable logic array (14) and by a micro-processor (24), 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 (12) position feedback (21), 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 armature position feedback signals (22, 23), and thus provides high positional accuracy, high speed and force (torque) control independent of the motor cardinal step positions. A standard 3-phase magnetic resistor sensor (13) is used both to sense the motor phase and to feed back the motor position to the micro-processor for calculation of corrections; actual control of the stepper motor is communicated as a single amplitude modulated control signal.

Inventors

• 👤 Jehuda Ish-Shalom
• 👤 Leonard Alan Katz
• 👤 Dennis Gene Manzer

Bibliographic Details