Electricity: motive power systems – Limitation of motor load – current – torque or force
Patent
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.
Hisatake Michio
Hyodo Toru
Takahashi Yoshitaka
Yamamoto Kazuji
Striker Michael J.
Weldon Ulysses
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