Driver circuit for electric actuator

Details Driver circuit for electric actuator Driver circuit for electric actuator

1993-02-08

1995-06-13

Ro, Bentsu

Electricity: motive power systems

Synchronous motor systems

Hysteresis or reluctance motor systems

318254, 318492, H02P 705

Patent

active

054246245

ABSTRACT:
A driver circuit for an electric actuator having one or more phase windings which are selectively connected to a source of electrical energy is disclosed. Magnetic energy stored in the phase windings is transferred to a capacitor to prevent damage. The driver circuit includes a recovery circuit for transferring this energy from the capacitor back to the source of electrical energy. The recovery circuit includes an electronic recovery switch which is selectively opened and closed by a duty cycle controller logic circuit. When the recovery circuit switch is closed, electrical current flows from the capacitor to an inductor. The inductor returns this energy to the source of electrical energy. The recovery circuit further includes a power supply for the logic components of the duty cycle controller. The power supply receives operating power from the unused energy stored in the windings of the actuator driver circuit and uses the same ground node as the duty cycle controller logic circuit and the recovery circuit switch. Also, the recovery circuit includes a pair of auxiliary power source terminals which permit it to re-charge the source of electrical energy even though none of the phase windings are energized.

REFERENCES:
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patent: 5041768 (1991-08-01), Herrmann
patent: 5075610 (1991-12-01), Harris

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