Electricity: motive power systems – Plural – diverse or diversely controlled electric motors – Plural – diverse motor controls
Patent
1984-06-28
1985-10-01
Shoop, Jr., William M.
Electricity: motive power systems
Plural, diverse or diversely controlled electric motors
Plural, diverse motor controls
318266, 318331, 318430, 318469, H02P 308
Patent
active
045448663
ABSTRACT:
A window operating system includes a motor control circuit for controlling the operation of direct current permanent magnet motors mounted on window operators associated with each window. Each of the motors on each of the windows is connected to the control circuit only by a pair of wires which both power the motor and provide information to the control circuit as to the status of motor operation. The status of motor operation is determined by monitoring the back electromagnetic force expressed by the motors. To help differentiate back electromagnetic force from supply voltage supplied to the motors, the motors are supplied with full rectified alternating current power, rather than simple direct current, so that the presence or absence of zero voltage between half waves of the voltage expressed across the motors can be monitored to determine the absence or presence of back electromotive force during those time periods. A reversible connector is used to connect the motor to the control circuit so that the polarity of motor operation can be reversed by reversal of the connector relative to its mating receptacle.
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Clemmons Richard R.
Sanders, III Stephen H.
Zimmer Darrel E.
Amerock Corporation
Ro Bentsu
Shoop Jr. William M.
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