Speed or torque control circuit for an electronically commutated

Details Speed or torque control circuit for an electronically commutated Speed or torque control circuit for an electronically commutated

1983-06-09

1985-02-19

Truhe, J. V.

Electricity: motive power systems

Switched reluctance motor commutation control

318138, 318439, H02P 602

Patent

active

045008213

ABSTRACT:
In a motor speed or torque control circuit for an electronically commutated motor (ECM) used in a ceiling fan, a pulse width modulator operating at an above audible pulse repetition rate is used in combination with means to adjust the motor voltage to achieve a large (20 to 1) range of smooth fan speed adjustment. The pulse width modulator, which takes the form of a comparator, has as inputs an invariant sawtooth voltage waveform, and a smooth, adjustable control voltage dependent on the voltage supplied to the motor. A steady state or pulsed output is produced dependent on whether intersections occur at the comparator input. The active output state of the pulse width modulator is used to control the application of power to the motor. The control circuit permits speed or torque control from a wall location, or on the ceiling fixture combining the motor. The speed or torque control circuitry is designed for use in a maximally integrated ECM control circuit. The invention also concerns a method of controlling the torque or speed of an ECM.

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Millman and Halkias, Integrated Electronics Analog and Digital Circuits and Systems, Chap. 13, pp. 408-445.
Richard Kash, Semi-Custom and CMOS Operational Amplifier, Mar./Apr. 1982, pp. 58-59.

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