Control circuit for reversible electric motors

Details Control circuit for reversible electric motors Control circuit for reversible electric motors

1979-08-20

1982-12-21

Mitchell, David M.

Electricity: motive power systems

Motor-reversing

Automatic and/or with time-delay means

180 65R, 318139, B60K 102

Patent

active

043651895

ABSTRACT:
A reversible electrically driven motor is disclosed together with circuitry for controlling the direction of the motor such that the current to the drive motor cannot be reversed to an opposite direction while the motor continues operation in a first direction. Once the motor slows to predetermined speed, which may approximate near-stop condition, the circuitry permits the voltage to operate in the opposite direction thereby reversing the motor. The control apparatus may include the portion of the electric motor which operates as a generator when the motor is not being electrically driven, a solid state sensor for sensing the voltage generated, and a lock-out circuit which responds to the sensed voltage to disable the operation of the driving circuit which reverses the motor.

REFERENCES:
patent: 2378785 (1945-06-01), Ogden
patent: 2394111 (1946-02-01), Schaelchun et al.
patent: 2494611 (1950-01-01), Eisenberg et al.
patent: 2510028 (1950-05-01), Ulinski
patent: 2817802 (1957-12-01), Roggenkamp
patent: 2990506 (1961-06-01), Montross
patent: 3179198 (1965-04-01), Hastings
patent: 3332507 (1967-07-01), Bush
patent: 3436632 (1969-04-01), Tisserant et al.
patent: 3884318 (1975-05-01), Abels et al.
patent: 3923116 (1975-12-01), Thompson et al.

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