B - Operations – Transporting – 41 – J
Patent
B - Operations, Transporting
41
J
340/206, 318/22,
B41J 29/38 (2006.01) G05B 19/40 (2006.01) H02P 7/06 (2006.01) H02P 8/00 (2006.01)
Patent
CA 1154845
Case 781115 CONTROL SYSTEM FOR A MULTI-PHASE MOTOR Abstract of the Disclosure A motor control system for use in a high speed teleprinter or the like for controlling the rotational position and movement of a rotor, and apparatus driven by the rotor, by detecting back EMF induced into an unenergized field winding by rotational movement of the rotor. The out- put and input terminals of a first amplifier responsive to a first motor control signal, and a second amplifier responsive to a second motor control signal, are reactively coupled such that the amplifiers respond to either motor control signal to develop a signal simulating the signal into an unenergized winding of the motor due to mutual inductance with an energized winding. A differential voltage comparator provides a feed- back signal indicative of motor performance upon comparing the simulated signal with the signal actually induced. In the illustrated teleprinter application, the feedback signal is utilized to control energization of the carriage drive motor to assure accurate positioning of the teleprinter print head, and to provide an accurate indication of actual print head position to the signal processing circuitry of the teleprinter.
351713
Budniak Mitchell S.
Martin Donald P.
Martin Research Limited
Osler Hoskin & Harcourt Llp
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