Torque ripple reduction of a variable flux motor

This paper examines torque ripple in a new topology of variable flux machine with AlNiCo magnet. To reduce the torque ripple, the design and finite element modeling of this machine are reviewed and the finite element model results are verified with the prototyped motor. The effects of various electrical, magnetic and geometrical parameters such as load, magnetization level of the magnet, tooth and yoke width and magnet dimensions, on both torque mean value and torque ripple are discussed using the verified finite element model. Finally, modified rotor structure is presented that reduces the torque ripple by 35% with the same torque mean value and magnetization current for the motor. The torque ripple of the modified design is analyzed for a wide range of load and speed.

[1]  Duane C. Hanselman,et al.  Brushless Permanent-Magnet Motor Design , 1994 .

[2]  N. Bianchi,et al.  Interior PM machines using Ferrite to substitute rare-earth surface PM machines , 2012, 2012 XXth International Conference on Electrical Machines.

[3]  Nobuyuki Matsui,et al.  A design approach for direct-drive permanent magnet motors , 2005 .

[4]  D. K. Lieu,et al.  Reduction of torque ripple in brushless DC motors , 1995 .

[5]  C. Rahn,et al.  Field weakening for radial force reduction in brushless permanent-magnet DC motors , 2004, IEEE Transactions on Magnetics.

[6]  Pragasen Pillay,et al.  Design of high torque density variable flux permanent magnet machine using Alnico magnets , 2014, 2014 IEEE Energy Conversion Congress and Exposition (ECCE).

[7]  C. R. Pollock,et al.  Analysis and reduction of acoustic noise from a brushless DC drive , 1999, Conference Record of the 1999 IEEE Industry Applications Conference. Thirty-Forth IAS Annual Meeting (Cat. No.99CH36370).

[8]  B. Grcar,et al.  Control-Based Reduction of Pulsating Torque for PMAC Machines , 2002, IEEE Power Engineering Review.

[9]  I. Husain,et al.  Permanent Magnet Synchronous Motor Magnet Designs with Skewing for Torque Ripple and Cogging Torque Reduction , 2007 .

[10]  Kyung-tae Kim,et al.  Optimization Methods of Torque Density for Developing the Neodymium Free SPOKE-Type BLDC Motor , 2013, IEEE Transactions on Magnetics.

[11]  Deug-Woo Lee,et al.  Various design techniques to reduce cogging torque by controlling energy variation in permanent magnet motors , 2001 .

[12]  チェン，シャオタン,et al.  Torque ripple-free electric power steering , 2000 .

[13]  P. Pillay,et al.  Prediction of electromagnetic forces and vibrations in SRMs operating at steady state and transient speeds , 2004, Conference Record of the 2004 IEEE Industry Applications Conference, 2004. 39th IAS Annual Meeting..

[14]  Iqbal Husain,et al.  Torque ripple minimization of switched reluctance machines through current profiling , 2013, 2011 IEEE Energy Conversion Congress and Exposition.

[15]  Yong Li,et al.  Optimum design of magnet shape in permanent-magnet synchronous motors , 2003 .

[16]  M. Hsieh,et al.  Alternative Rotor Designs for High Performance Brushless Permanent Magnet Machines for Hybrid Electric Vehicles , 2012, IEEE Transactions on Magnetics.

[17]  Massimo Barcaro,et al.  Permanent-Magnet Optimization in Permanent-Magnet-Assisted Synchronous Reluctance Motor for a Wide Constant-Power Speed Range , 2012, IEEE Transactions on Industrial Electronics.

[18]  Gianmario Pellegrino,et al.  Design of Ferrite-Assisted Synchronous Reluctance Machines Robust Toward Demagnetization , 2014, IEEE Transactions on Industry Applications.

[19]  B. J. Chalmers,et al.  Influence of machine symmetry on reduction of cogging torque in permanent-magnet brushless motors , 2000 .

[20]  Nicola Bianchi,et al.  Design techniques for reducing the cogging torque in surface-mounted PM motors , 2000, Conference Record of the 2000 IEEE Industry Applications Conference. Thirty-Fifth IAS Annual Meeting and World Conference on Industrial Applications of Electrical Energy (Cat. No.00CH37129).

[21]  N. Matsui,et al.  A Design Approach for Direct-Drive Permanent-Magnet Motors , 2005, IEEE Transactions on Industry Applications.