Electricity: motive power systems – Braking – Automatic and/or with time-delay means
Patent
1982-02-05
1986-08-12
Weldon, Ulysses
Electricity: motive power systems
Braking
Automatic and/or with time-delay means
318327, 318345D, 318345H, G05B 500
Patent
active
046058834
ABSTRACT:
A motor speed control circuit for closed loop control of an electric motor of a household electric appliance is disclosed herein. The motor speed control circuit includes a coil adapted to be placed in proximity with a fan connected to an electric motor and producing a time varying signal in response to rotation thereof. A comparator connected to the coil generates a rectangular wave having a frequency proportional to the frequency of the coil signal. Additional means are provided for converting the rectangular wave signal, a D.C. signal having an amplitude which corresponds to the frequency of the rectangular wave. The D.C. signal is compared to a reference signal at an amplifier to produce an error signal which is fed through an opto-isolator to a conduction angle controlled thyrister. The thyrister is connected to the electric motor and a source of electric power to control the speed of the electric motor.
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Dean Clifford A.
Fox Robert J.
Rose Neil M.
Sunbeam Corporation
Weldon Ulysses
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