Electricity: motive power systems – Induction motor systems – Primary circuit control
Patent
1988-04-18
1989-07-04
Smith, Jr., David
Electricity: motive power systems
Induction motor systems
Primary circuit control
318436, 318808, H02P 126
Patent
active
048454184
ABSTRACT:
A method of controlling current in an AC motor to inhibit small torques on an unloaded motor output shaft and to improve buildup of steady-state operating flux in a rotor includes supplying current to the stator windings through a plurality of semiconductor switches, operating the semiconductor switches to supply a plurality of gradually increasing currents to the stator windings over a time interval corresponding to approximately one rotor time constant to bring flux in the rotor up to approximately 10% of a steady-state operating flux in the rotor, operating the semiconductor switches to supply a current that is the maximum current rated for pulsed operation of the semiconductor switches for a time interval over which a product of current and time is sufficient to produce steady-state operating flux in the rotor, and then reducing the stator current to a level for maintaining steady-state operating flux in the rotor. A microelectronic apparatus for carrying out the method is also disclosed.
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Gabriel, et al., "Field-Oriented Control of a Standard AC Motor Using Microprocessors", Adjustable Speed AC Drive Systems IEEE Press, 1980.
Bulletin 1392 High Performance AC Drive System, Allen-Bradley, Mar., 1986.
Allen-Bradley Company Inc.
Smith Jr. David
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