Electricity: motive power systems – Constant motor current – load and/or torque control
Patent
1995-06-07
1997-10-21
Masih, Karen
Electricity: motive power systems
Constant motor current, load and/or torque control
318434, 318481, 388904, 3889075, 388929, H02P 700
Patent
active
056800215
ABSTRACT:
Draft inducer systems and methods for use with a furnace. A motor drives a fan in response to a motor control signal for inducing a draft which is a function of motor speed and motor torque. A processor defines a speed/torque operating curve having a minimum desired speed and a maximum desired speed between which the speed/torque operating curve is coincident with a pressure curve corresponding to a desired pressure drop across the furnace heat exchanger assembly caused by the draft induced by the fan. The speed/torque operating curve, for a given speed above the maximum desired speed, defines a torque less than the torque defined by the pressure curve for the given speed. A control circuit generates the motor control signal in response to the speed/torque operating curve for controlling the motor torque as a function of the motor speed whereby operation of the motor is controlled so that the draft induced by the fan causes the desired pressure drop in a desired operating range between the minimum and maximum desired speeds and operation of the motor is inhibited outside the desired operating range.
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General Electric Company
Krisher, Jr. Ralph E.
Masih Karen
LandOfFree
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