Electricity: motive power systems – Constant motor current – load and/or torque control
Patent
1995-03-09
1997-04-01
Ro, Bentsu
Electricity: motive power systems
Constant motor current, load and/or torque control
110162, 236 10, 236 67, 236DIG9, F23L 1700, H02P 700
Patent
active
056169957
ABSTRACT:
Systems and methods for controlling a draft inducer for use with a furnace. The draft inducer includes a fan for moving combustion chamber gases for inducing a draft in the furnace combustion chamber that causes a pressure drop across a heat exchanger. The density of the gases flowing across the heat exchanger and the fan differs from a first operating state of the furnace to a second operating state of the furnace. A motor drives the fan in response to a motor control signal so that different motor speeds result as a function of the density of the gases flowing across the fan. A control circuit generates the motor control signal as a function of a first set of speed/torque curves until a speed signal indicates that the motor has reached a predetermined speed. After the speed signal indicates that the motor has reached the predetermined speed, the control circuit generates the motor control signal as a function of a second set of speed/torque curves. Thus, the motor will operate in accordance with the first speed/torque curves when the furnace is in the first operating state and in accordance with the second speed/torque curves when the furnace is in the second operating state.
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General Electric Company
Krisher, Jr. Ralph E.
Ro Bentsu
LandOfFree
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