Electricity: motive power systems – Induction motor systems – Primary circuit control
Patent
1994-06-21
1996-09-24
Cabeca, John W.
Electricity: motive power systems
Induction motor systems
Primary circuit control
318804, 318807, 331 31, H02P 540
Patent
active
055594190
ABSTRACT:
Power is provided to the stator windings of an AC induction machine which includes a component at the fundamental drive frequency for the machine and a superimposed signal component which is at a substantially higher frequency than the drive power. The fundamental drive power is provided at a level which results in saturation in the stator which follows the magnetic flux vector. The stator response at the signal frequency is then detected to provide a correlation between the response at the signal frequency and the magnetic flux vector position. The detection of the response at the signal frequency is preferably carried out by a heterodyne detection process, by mixing signals at the signal frequency with the measured stator currents, and filtering the mixed signals to isolate the signal indicative of the flux vector position.
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Jansen Patrick L.
Lorenz Robert D.
Cabeca John W.
Wisconsin Alumni Research Foundation
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