Electricity: motive power systems – Induction motor systems – Primary circuit control
Patent
1996-09-27
1999-03-16
Ip, Paul
Electricity: motive power systems
Induction motor systems
Primary circuit control
318805, 318810, 417 36, 417 22, H02P 540
Patent
active
058834893
ABSTRACT:
A power control system in combination with a three-phase AC motor coupled to a water pump enables the operation of the motor at speeds up to 10,800 RPM so as to provide improved pumping capacity with a smaller motor and smaller pump. The control system supplies AC power to the motor with a frequency of the power being increased at a first high rate up to a frequency at which pump pressure is about equal to a value at which water is being pumped from the outlet pipe of the pump. Thereafter, AC power frequency is increased to the second, slower rate up to a maximum operating frequency of the motor. During the time that frequency of the AC power is being increased, motor current is continuously monitored and compared to a maximum allowable current. If monitored current exceeds allowable current, the frequency of operation is decreased until monitored current is less than the allowable current. Thereafter, frequency is again increased so long as monitored current is less than allowable current. Preferably, the allowable current is set to maintain operation of the motor at about its pullout torque level throughout the range of operation.
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General Electric Company
Ip Paul
Traynham Wayne O.
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