Method and system for squelching decaying current in motor phase

Details Method and system for squelching decaying current in motor phase Method and system for squelching decaying current in motor phase

1976-04-08

1979-08-14

Rubinson, Gene Z.

Electricity: motive power systems

Open-loop stepping motor control systems

318685, 318138, G05B 1940

Patent

active

041646975

ABSTRACT:
A multiphase stepper motor is used to position the printhead of a thermal printer. Movement of the printhead is controlled by sequentially enabling adjacent phases of the stepper motor. While enabled, the current flowing in any phase is controlled by a switching regulator. During those periods when the switching regulator is turned off, the decaying current in an enabled phase flows through a flyback diode, the power loss associated with the flyback diode circuit being very small. Accordingly, the decay of current in the inductive phase winding is primarily controlled by the losses of the winding itself. When a phase is disabled, however, and the next phase enabled by the enabling means of the controller, it is desired that the inductive current in the disabled phase rapidly decay to zero. This is accomplished by a circuit in the decaying current path and in series with the flyback diode, this circuit being switchable to a high loss condition during the decaying phase of the inductive current. In the preferred embodiment, this circuit is configured so as to maintain the voltage across the disabled winding substantially constant during the period of current decay. Accordingly, the current decays to zero in a linear fashion.

REFERENCES:
patent: 3573593 (1971-04-01), Beery
patent: 3750000 (1973-07-01), Bruckner et al.
patent: 3893012 (1975-07-01), Lin
patent: 3903467 (1975-09-01), Eckardt

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