Speed and torque control for fractional horsepower motors

Details Speed and torque control for fractional horsepower motors Speed and torque control for fractional horsepower motors

1978-12-08

1980-11-11

Smith, Jr., David

Electricity: motive power systems

Braking

Automatic and/or with time-delay means

318341, 318345F, H02P 516

Patent

active

042335493

ABSTRACT:
Power control circuitry for supplying pulses of power from a power source to a fractional horsepower motor with a plurality of power pulses applied to the motor during each half cycle of the power source waveform for more uniform speed and torque characteristics of the motor at low speeds. A timing capacitor in a motor speed control portion of the circuitry has a constant sum of resistances in the charge and discharge paths for fixed frequency of power pulses applied to the motor. The timing capacitor is electrically connected to a wiper arm of a variable resistor located in both the charge and discharge paths such that resistance may be shifted between the paths to vary the duty cycle of the pulses over a wide range. A pulse generating portion of the circuitry includes a threshold comparator and a trigger comparator to respectively monitor the voltage on the timing capacitor for high or low conditions and cause a bi-stable circuit to change output states upon the occurrence of either condition to generate a train of pulses. The bi-stable circuit is adapted to control the conductive states of transistors in series connection between the motor and the power source to apply repetitive constant-frequency, variable duty cycle pulses of power from the power source to the motor in accordance with the train of pulses. Related methods are also disclosed.

REFERENCES:
patent: 3195029 (1965-07-01), Gilbreath
patent: 3854079 (1974-12-01), Brown
Jung, W. G. "The IC Time Machine", Popular Electronics, 11-73, pp. 54-57.
Timers 555,556, Signetics Corp. pp. 18, 1973.

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