Safety control device of commutator motors

Details Safety control device of commutator motors Safety control device of commutator motors

1981-12-18

1985-06-18

Weldon, Ulysses

Electricity: motive power systems

Limitation of motor load, current, torque or force

318331, 318345C, 318345G, H02K 1732

Patent

active

045243093

ABSTRACT:
A safety control device for a speed control circuit of a commutator motor having an ignition circuit includes a circuit for detecting an armature current and defining whether the commutator motor is energized with a supply current or with a free wheel current, a maintaining circuit for discriminating if the detected result is a continuously energized condition or an intermittent condition, and a bistable circuit. The maintaining circuit smoothes the detected voltage of the energized motor and maintains the voltage over at least one cycle of the power source and functions temporarily in an equivalent manner of continuous energization of the motor when power source is applied to the motor. The bistable circuit nullifies the ignition circuit of the motor control when the motor is in an intermittent energization and switches the ignition circuit into an effective condition as the maintaining circuit comes to accumulate the voltage above the predetermined level while no speed designation is made to the speed control circuit of the motor.

REFERENCES:
patent: 3249840 (1966-05-01), Eriksson et al.
patent: 3443189 (1969-05-01), Gilbreath
patent: 3477007 (1969-11-01), Ducommun et al.
patent: 3564372 (1971-02-01), Vogelsberg et al.

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