Electricity: motive power systems – Induction motor systems – Primary circuit control
Patent
1993-07-20
1995-10-24
Sircus, Brian
Electricity: motive power systems
Induction motor systems
Primary circuit control
318801, 318808, H02P 318
Patent
active
054612969
ABSTRACT:
A method for starting an unexcited, multiple phase, alternating current induction motor rotating at an unknown speed is provided. The method includes generating an output signal with an AC drive at a predetermined frequency in order to energize the motor. The output signal has independently adjustable frequency and voltage components. A speed reference is provided which is functionally related to the frequency of the output signal. The voltage of the output signal is ramped at a predetermined rate and the frequency of the output signal is adjusted such that the voltage of the output signal equals the motor's set point and the speed reference is substantially equal to the speed of the motor. The motor then enters the normal operating mode.
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Gritter David J.
Messersmith David M.
Eaton Corporation
Sircus Brian
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