Superposition techniques for analyzing cogging torque sensitivity to manufacturing errors in fractional pitch PMSM

Theoretically, the layout of fractional pitch permanent magnet motors should ensure the cancellation of most cogging torque harmonics. In reality, manufacturing errors lead to incomplete cancellation and higher than expected cogging torque. Two potential manufacturing errors are the variation in angle between successive magnets and the strength of the magnets.

[1]  D. Howe,et al.  Synthesis of cogging torque waveform from analysis of a single stator slot , 2005, IEMDC 2005.

[2]  T. Sebastian,et al.  Issues in reducing the cogging torque of mass-produced permanent-magnet brushless DC motor , 2004 .

[3]  Greg Heins,et al.  Accurate Torque Ripple Measurement for PMSM , 2011, IEEE Transactions on Instrumentation and Measurement.

[4]  Leila Parsa,et al.  Interior Permanent Magnet Motors With Reduced Torque Pulsation , 2008, IEEE Transactions on Industrial Electronics.

[5]  G. Ombach,et al.  Design of PM Brushless Motor Taking into Account Tolerances of Mass Production - Six Sigma Design Method , 2007, 2007 IEEE Industry Applications Annual Meeting.

[6]  D. Howe,et al.  Evaluation of superposition technique for calculating cogging torque in permanent-magnet brushless machines , 2006, IEEE Transactions on Magnetics.

[7]  R. Fiser,et al.  Additional Cogging Torque Components in Permanent-Magnet Motors Due to Manufacturing Imperfections , 2009, IEEE Transactions on Magnetics.

[8]  Sanjib Kumar Panda,et al.  Periodic torque ripples minimization in PMSM using learning variable structure control based on a torque observer , 2003, IECON'03. 29th Annual Conference of the IEEE Industrial Electronics Society (IEEE Cat. No.03CH37468).

[9]  Thomas A. Lipo,et al.  Torque quality and comparison of internal and external rotor axial flux surface-magnet disc machines , 2006, IEEE Transactions on Industrial Electronics.

[10]  J. Hammersley SIMULATION AND THE MONTE CARLO METHOD , 1982 .

[11]  Z.J. Liu,et al.  Cogging torque prediction by superposition of torque due to pole transition over slot , 2005, IEEE International Conference on Electric Machines and Drives, 2005..