Control circuit for an electromotor

Details Control circuit for an electromotor Control circuit for an electromotor

1974-10-15

1976-06-22

Myhre, Charles J.

Internal-combustion engines

Cooling

Devices for cooling liquid by air flow

123 4112, 123 4165, 180 82R, 322 33, 340 52R, F01P 710

Patent

active

039644448

ABSTRACT:
A pair of relay contacts directly connect the electromotor to a battery when closed. One side of the relay coil controlling the contacts is connected to a battery when a thermostat responsive to engine temperature closes. The other side of the relay coil is connected to the battery through an electronic switch, in one embodiment a thyristor, in the other a transistor, which are in the conductive state when the ignition switch is closed. The thyristor further is conductive for one operation following opening of the ignition switch, while the transistor is conductive for a predetermined time period following opening of the ignition switch.

REFERENCES:
patent: 3387598 (1968-06-01), Almenfors
patent: 3823363 (1974-07-01), Hill
patent: 3853098 (1974-12-01), Ishikawa
patent: 3894521 (1975-07-01), Sakasegawa

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