Two speed motor controller

Details Two speed motor controller Two speed motor controller

1987-09-14

1989-05-16

Shoop, Jr., William M.

Electricity: motor control systems

Closed loop speed control system for dc motor with commutator

Analog armature control

361 22, 361 24, 623241, 388903, 388915, 388921, 388933, 388934, G05B 500

Patent

active

048313130

ABSTRACT:
An electronic control for regulating the operation of a two-speed motor in a heat transfer system such as a heat pump or air conditioner. The control receives high and low demand signals from a thermostat and a motor unit operates at high and low speeds in response to, respectively, high and low speed signals. The control includes an initial timer, high and low speed operators, and a speed change delay. The initial timer detects the occurrence of a demand signal from the thermostat, counts a predetermined period of time, and responsively issues an initial timing completion signal. The high and low speed operators detect the timing completion signal as well as either a high or low thermostat demand signal. One of the operators then responsively issues either a high or low speed signal to the motor unit. The motor unit accordingly operates at a high or low speed. The speed change delay detects the change in a thermostat demand signal from a high to a low state or a low to a high state. The delay disables the high and low speed operators for a predetermined period of time, responsively enabling either the high or low speed operator to begin after the delay period has passed.

REFERENCES:
patent: 3585451 (1971-06-01), Day
patent: 3636369 (1972-01-01), Harter
patent: 3740613 (1973-06-01), Strachan
patent: 3794858 (1974-02-01), Squiers
patent: 3878436 (1975-04-01), Bogel
patent: 3909675 (1975-09-01), Hirsbrunner et al.
patent: 4042966 (1977-08-01), Newell et al.
patent: 4253130 (1981-02-01), Newell
patent: 4281358 (1981-07-01), Plouffe et al.
Texas Instruments publication, "10 AA Solid State Motor Protection Module", Oct. 10, 1972, pp. 1-9.

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