Analysis of split-phase electric machines with unequally-loaded stator windings and distorted phase currents

Split-phase machines are multi-phase machines whose stator phases are split into two or more three-phase windings. When all windings are equally loaded, the split-phase topology produces a better air-gap field than the usual three-phase one, with beneficial effects on rotor additional losses and torque quality. This does not occur when the windings are differently loaded, as typically occurs is split-phase motors with one or more out-of-service supplying inverters. This paper presents an analytical approach to accurately predict the air-gap field distortion in split-phase mechines with unequally-loaded windings and in presence of possible phase current distortion. Results obtained with the proposed method are assessed by comparison with FE simulations.

[1]  S. Williamson,et al.  Pulsating torque and losses in multiphase induction machines , 2001, Conference Record of the 2001 IEEE Industry Applications Conference. 36th IAS Annual Meeting (Cat. No.01CH37248).

[2]  N. Bianchi.  Electrical Machine Analysis Using Finite Elements , 2005 .

[3]  Davood Yazdani,et al.  Full Utilization of the Inverter in Split-Phase Drives by Means of a Dual Three-Phase Space Vector Classification Algorithm , 2009, IEEE Transactions on Industrial Electronics.

[4]  Alberto Tessarolo,et al.  On the Modeling of Commutation Transients in Split-Phase Synchronous Motors Supplied by Multiple Load-Commutated Inverters , 2010, IEEE Transactions on Industrial Electronics.

[5]  D. White,et al.  Electromechanical energy conversion , 1959 .

[6]  A. Tessarolo,et al.  Modeling, simulation and experimental validation of a generation system for Medium-Voltage DC Integrated Power Systems , 2009, 2009 IEEE Electric Ship Technologies Symposium.

[7]  G. Joos,et al.  A current-source inverter fed induction motor drive system with reduced losses , 1995, IAS '95. Conference Record of the 1995 IEEE Industry Applications Conference Thirtieth IAS Annual Meeting.

[8]  Hamid A. Toliyat,et al.  Multiphase induction motor drives - : a technology status review , 2007 .

[9]  Ioan-Adrian Viorel,et al.  On the Carter's Factor Calculation for Slotted Electric Machines , 2007 .

[10]  N. Bianchi,et al.  Impact of MMF Space Harmonic on Rotor Losses in Fractional-Slot Permanent-Magnet Machines , 2009, IEEE Transactions on Energy Conversion.

[11]  T. Hamiti,et al.  Comparison Between Finite-Element Analysis and Winding Function Theory for Inductances and Torque Calculation of a Synchronous Reluctance Machine , 2007, IEEE Transactions on Magnetics.

[12]  E. Klingshirn,et al.  High Phase Order Induction Motors - Part I-Description and Theoretical Considerations , 1983, IEEE Transactions on Power Apparatus and Systems.

[13]  P. Viarouge,et al.  Generalized transformations for polyphase phase-Modulation motors , 2006, IEEE Transactions on Energy Conversion.

[14]  Om P. Malik,et al.  Performance of a double-star synchronous generator with bridge rectified output , 1994 .

[15]  Emil Levi,et al.  Multiphase Electric Machines for Variable-Speed Applications , 2008, IEEE Transactions on Industrial Electronics.

[16]  A Tessarolo,et al.  Analytical methods for the accurate computation of stator leakage inductances in multi-phase synchronous machines , 2010, SPEEDAM 2010.