Influence of skew and cross-coupling on d- and q-axis inductances and flux-weakening performance of PM brushless AC machines

A method is proposed for predicting the d- and q-axis inductances and flux-weakening performance of PM brushless AC machines accounting for skew and d-q axis cross-coupling. The method is based on a d-q-axis flux-linkage model, a hybrid 2-D FE-analytical method being used to predict the d- and q-axis inductances. However, it only requires 2-D FE analysis of the magnetic field distribution over a cross-section of the machine. The developed method is used to predict the torque-speed characteristic of an interior PM brushless AC machine with one stator slot-pitch skew, which is compared with predictions from a direct FE analysis and validated by measurements.

[1]  S. Nasar,et al.  A general equivalent circuit (GEC) of electric machines including cross-coupling saturation and frequency effects , 1988 .

[2]  Hossin Hosseinian,et al.  Power Electronics , 2020, 2020 27th International Conference on Mixed Design of Integrated Circuits and System (MIXDES).

[3]  M. Sanada,et al.  Effects and Compensation of Magnetic Saturation in Flux-Weakening Controlled Permanent Magnet Synchronous Motor Drives , 1994 .

[4]  A.M. Knight,et al.  Investigation and Simulation of fields in large salient-pole synchronous Machines with skewed stator slots , 2005, IEEE Transactions on Energy Conversion.

[5]  Mario Pacas,et al.  A predictive torque control for the synchronous reluctance machine taking into account the magnetic cross saturation , 2005 .

[6]  Hyun-Kyo Jung,et al.  Characteristic analysis of multilayer-buried magnet synchronous motor using fixed permeability method , 2005, IEEE Transactions on Energy Conversion.

[7]  D. Howe,et al.  Calculation of d- and q-axis inductances of PM brushless ac machines accounting for skew , 2005, IEEE Transactions on Magnetics.

[8]  S. Morimoto,et al.  Prediction of iron loss in rotating machines with rotational loss included , 2003 .

[9]  D. Howe,et al.  Influence of inaccuracies in machine parameters on field-weakening performance of PM brushless AC drives , 1999, IEEE International Electric Machines and Drives Conference. IEMDC'99. Proceedings (Cat. No.99EX272).

[10]  A. S. Abdallah,et al.  Experimental study of the saturation and the cross-magnetizing phenomenon in saturated synchronous machines , 1988 .

[11]  A. M. El-Serafi,et al.  Determination of the parameters representing the cross-magnetizing effect in saturated synchronous machines , 1993 .

[12]  S. Morimoto,et al.  Expansion of operating limits for permanent magnet motor by current vector control considering inverter capacity , 1990 .

[13]  Zou Jibin,et al.  Finite element calculation of the saturation DQ-axes inductance for a direct drive PM synchronous motor considering cross-magnetization , 2003, The Fifth International Conference on Power Electronics and Drive Systems, 2003. PEDS 2003..

[14]  D. Howe,et al.  Iron loss in PM brushless AC machines under maximum torque per ampere and flux weakening control , 2002 .

[15]  Peter P. Silvester,et al.  Finite elements for electrical engineers: Unbounded radiation and scattering , 1996 .

[16]  Aaas News,et al.  Book Reviews , 1893, Buffalo Medical and Surgical Journal.

[17]  Peter P. Silvester,et al.  Finite Elements for Electrical Engineers , 1983 .

[18]  E. Levi,et al.  Impact of dynamic cross-saturation on accuracy of saturated synchronous machine models , 2000 .

[19]  D. Howe,et al.  Online optimal flux-weakening control of permanent-magnet brushless AC drives , 2000 .

[20]  Maarten J. Kamper,et al.  Effect of stator chording and rotor skewing on performance of reluctance synchronous machine , 2002 .