Battery supplied motor current control system with safety circui

Details Battery supplied motor current control system with safety circui Battery supplied motor current control system with safety circui

1978-07-28

1980-06-10

Truhe, J. V.

Electricity: motive power systems

Battery-fed motor systems

318476, 318459, 318455, H02P 300

Patent

active

042075033

ABSTRACT:
A controlled switch 4 provides current pulses derived from a battery 3 to a motor 1, having a series field 2 under command of a control unit 8 which provides command pulses for repetitive closing of the controlled switch 4. Current through the motor is sensed by a sensing resistor 6 and connected to a safety circuit 9 which, upon sensing of current flow in the absence of a control pulse from the unit 8, disconnects current to the motor by opening a controlled switch 5. To distinguish between (a) current flowing from the battery 3 l and (b) circulating current flowing during pulse gaps in a free-wheeling diode 7 connected across the field and armature of the motor, voltage across the free-wheeling 7 is sensed, thereby effectively sensing the conduction state of the free-wheeling diode and, if the free-wheeling diode is conductive, disabling the safety circuit to prevent spurious operation thereof during flow of inductive, circulating current through the bypass or free-wheeling diode under normal operation.

REFERENCES:
patent: 3689818 (1972-09-01), Morton et al.
patent: 3818291 (1974-06-01), Miyake
patent: 3902105 (1975-08-01), Delancy et al.
patent: 3914675 (1975-10-01), Konrad
patent: 4017775 (1977-04-01), Artrip
patent: 4025836 (1977-05-01), Naito et al.
patent: 4081725 (1978-03-01), Schmidt et al.

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