Calculation of Rotor Currents of Single-phase Synchronous Reluctance Motor Using d-q Harmonic Balance Techniques

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The d-q harmonic balance technique is utilized to extract the closed-form expressions for currents induced in the rotor cage of a line-start single-phase synchronous reluctance motor under steady-state conditions as a function of load angle and auxiliary winding run-capacitor value. The equations show a non-negligible amount of current flow in the rotor of the machine, even at synchronous speed operation; there is, therefore, an added I2R loss. The calculated I2R loss in the rotor d-axis circuit is higher and diminishes rapidly with increase in load angle, while the q-axis circuit loss increases slightly with load angle. A rapid increase in loss is also observed in both the d- and q-axes with increase in run-capacitor values.

Keywords: harmonic balance; load angle; rotor current; single-phase capacitor motor; steady-state; synchronous reluctance motor

Document Type: Research Article


Affiliations: 1: Department of Electrical Engineering, University of Nigeria, Nsukka, Nigeria 2: Institut fur Elektrische Energiewandlung, Technische Universitat Darmstadt, Germany

Publication date: September 1, 2009

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