Electric motor speed controller and method

Details Electric motor speed controller and method Electric motor speed controller and method

1983-09-21

1984-09-11

Smith, Jr., David

Electricity: motive power systems

Braking

Automatic and/or with time-delay means

318139, H02P 516

Patent

active

044712766

ABSTRACT:
An electric motor speed controller circuit which comprises at least one power transistor in series between the motor and a power supply to form a power circuit such that current flows between the power supply and the motor through the transistor only when a signal current is supplied to the base of the transistor and which further comprises a control circuit for supplying a signal to the base of the transistor which signal is pulse width modulated so that the width of the pulse is proportional to the value of a variable resistance, inductance or capacitance of the speed control;

REFERENCES:
patent: 3260912 (1966-07-01), Gregory
patent: 3349309 (1967-10-01), Dannettell
patent: 3354371 (1967-11-01), Ainsworth et al.
patent: 3358206 (1967-12-01), Thiele
patent: 3560829 (1971-02-01), Brennan
patent: 3743911 (1973-07-01), Erler
patent: 3803471 (1974-04-01), Price et al.
patent: 3912994 (1975-10-01), Stovall

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