Electricity: motive power systems – Induction motor systems – Primary circuit control
Patent
1995-06-05
1996-10-15
Cabeca, John W.
Electricity: motive power systems
Induction motor systems
Primary circuit control
310169, 310201, 318767, H02P 528, H02K 1742
Patent
active
055657524
ABSTRACT:
Power is provided to the stator windings of an AC 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 rotor has saliencies which result in a change in impedance as seen at the stator windings to the high frequency excitation signal as a periodic function of rotor rotational position. Such saliencies are inherent in some permanent magnet synchronous and all synchronous reluctance machines, and may be provided by appropriate modification of the rotor of induction machines. The stator response at the signal frequency is then detected to provide a correlation between the response at the signal frequency and the rotor 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 rotor position. Conventional squirrel cage induction motors can be provided with sufficient spatial variations in the stator winding impedance as a function of rotor position in various ways, including varying the depth and/or width of the slots over the rotor conductive bars, by varying the cross-section of the bars, or by filling or partially filling some of the slots.
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Jansen Patrick L.
Lorenz Robert D.
Cabeca John W.
Wisconsin Alumni Research Foundation
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