Pumps – Condition responsive control of pump drive motor – Single motor control element responsive to means sensing...
Patent
1994-05-27
1995-09-05
Bertsch, Richard A.
Pumps
Condition responsive control of pump drive motor
Single motor control element responsive to means sensing...
417 42, 417 441, 417 4411, 3889075, 388929, 318432, F04B 4906
Patent
active
054474140
ABSTRACT:
Air handling apparatus (10) for delivering a volume of air at a generally constant flow rate regardless of changes in the operating conditions of a system with which the apparatus is used. A blower (12) pushes air from one point to another. The blower is operated by a blower motor (14). A switch (16) controls application of power to the motor. Sensors (20) are used to sense the voltage supplied to the motor, the current drawn by the motor, and the motor's operating speed. A flow controller (22) establishes a desired air flow rate to be provided by the blower. A processor (18) is responsive to the sensed voltage (V), current (I), and speed (S), an input (C) from the flow controller, and constants (K1-K4) related to performance characteristics of the blower to determine a torque required by the motor to produce a predetermined air flow rate. The torque value is determined as a function of the combined motor speed input from the sensor and an input from the flow controller. The processor is responsive to a calculated torque value for the motor. The processor supplies a control signal to the switch to control application of a voltage to the motor. This voltage is sufficient for the motor to produce the calculated torque. The processor includes feedback (28) by which the control signal can be modified first in response to the sensed current drawn by the motor; and additionally, by the voltage supplied to the motor.
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Nordby Craig
Skinner James
Thorn John S.
Bertsch Richard A.
Emerson Electric Co.
Thai Xuan M.
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