Speed control circuit for electric motor

Details Speed control circuit for electric motor Speed control circuit for electric motor

1980-11-21

1983-07-19

Truhe, J. V.

Electricity: motive power systems

Limitation of motor load, current, torque or force

318729, 318798, 318809, 318332, H02P 506

Patent

active

043946062

ABSTRACT:
Disclosed is an apparatus for controlling the rotational speed of an electric motor based upon the load encountered by the electric motor. A load sensor provides a voltage level based upon the operating load of the electric motor and accumulates this voltage in accordance with the cycle of the alternating current supplied to the motor. If during a cycle of the alternating current, the voltage exceeds a predetermined level, a transistor will be biassed into conduction, said transistor turning off a thyristor and preventing any further conduction of the thyristor during that cycle of the alternating current. Thus the duty cycle of the thyristor determines the total amount of current supplied to the electric motor and this current level determines the rotational rpm of the motor.

REFERENCES:
patent: Re29275 (1977-06-01), Berman et al.
patent: 3358205 (1967-12-01), Wechsler
patent: 3855511 (1974-12-01), Smith
patent: 4039913 (1977-08-01), Clegg
patent: 4126889 (1978-11-01), Ibamoto et al.
patent: 4163999 (1979-08-01), Eaton et al.
patent: 4168454 (1979-09-01), Gmeinder
patent: 4215383 (1980-07-01), Boyd et al.
patent: 4218730 (1980-08-01), Marumoto et al.

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