Design optimisation of reluctance synchronous machines: a motor and generator study

Design optimisation of Reluctance Synchronous Machines: A Motor and Generator Study E. Howard Department of Electrical Engineering, Stellenbosch University, Private Bag X1, Matieland 7602, South Africa. Dissertation: PhdEng (Elec) August 2017 This study focuses on the design and optimisation of the recently popular synchronous reluctance machine. The increase of this machine’s popularity is because of its inherent high efficiency, with industry pushing for an ever higher efficiency machine drive package. The study proposes design techniques that can be implemented in the design process to minimise or remove the inherent weaknesses. Machines designed by implementing the study techniques are manufactured and tested, with proposed design techniques validated through testing. Finally, the developed machine model is implemented in a design study in the high power range for wind generator application. It was found, assuming mechanical feasibility, that the type of machine can be implemented in the very high power range, with competitive efficiency and power factor values achieved. In order to even further improve machine performance and thus its competitiveness, an assisted reluctance synchronous machine model is proposed and optimised by implementing a retrofit rotor design and pre-designed machine stator. Results of this proposed machine indicate highly competitive machine performance, comparable with currently implemented machines in the field, thus warranting further investigation. ii Stellenbosch University https://scholar.sun.ac.za

[1]  Herman Van der Auweraer,et al.  Study of torque ripple and noise for different rotor topologies of a synchronous reluctance machine , 2015, 2015 9th International Symposium on Advanced Topics in Electrical Engineering (ATEE).

[2]  Fernando J. T. E. Ferreira,et al.  Technical and Economical Considerations on Super High-Efficiency Three-Phase Motors , 2012, IEEE Transactions on Industry Applications.

[3]  F. Cupertino,et al.  FEA-based multi-objective optimization of IPM motor design including rotor losses , 2010, 2010 IEEE Energy Conversion Congress and Exposition.

[4]  S.E. Sibande,et al.  Optimal design of a PM-assisted rotor of a 110 kW reluctance synchronous machine , 2004, 2004 IEEE Africon. 7th Africon Conference in Africa (IEEE Cat. No.04CH37590).

[5]  Maarten J. Kamper,et al.  Weighted factor multi-objective design optimisation of a reluctance synchronous machine , 2015, IEMDC 2015.

[6]  Robert D. Lorenz,et al.  Efficiency contours and loss minimization over a driving cycle of a variable-flux flux-intensifying interior permanent magnet machine , 2013, 2013 IEEE Energy Conversion Congress and Exposition.

[7]  Valéria Hrabovcová,et al.  Design of Rotating Electrical Machines , 2009 .

[8]  M. J. Kamper,et al.  Saliency performance investigation of synchronous machines for position sensorless controlled EV drives , 2013, 2013 IEEE International Symposium on Sensorless Control for Electrical Drives and Predictive Control of Electrical Drives and Power Electronics (SLED/PRECEDE).

[9]  Chas.P. Steinmetz,et al.  On the law of hysteresis , 1984, Proceedings of the IEEE.

[10]  Robert D. Lorenz,et al.  Novel design of flux-intensifying interior permanent magnet synchronous machine suitable for power conversion and self-sensing control at very low speed , 2010, 2010 IEEE Energy Conversion Congress and Exposition.

[11]  Thomas A. Lipo,et al.  Synchronous reluctance machines―a viable alternative for AC drives? , 1991 .

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

[13]  Alfredo Vagati,et al.  The synchronous reluctance solution: a new alternative in AC drives , 1994, Proceedings of IECON'94 - 20th Annual Conference of IEEE Industrial Electronics.

[14]  Michael N. Vrahatis,et al.  Particle Swarm Optimization Method for Constrained Optimization Problems , 2002 .

[15]  Jung Ho Lee,et al.  Rotor Design on Torque Ripple Reduction for a Synchronous Reluctance Motor With Concentrated Winding Using Response Surface Methodology , 2006, IEEE Transactions on Magnetics.

[16]  Ronghai Qu,et al.  Magnetization and performance analysis of a variable-flux flux-intensifying interior permanent magnet machine , 2015, 2015 IEEE International Electric Machines & Drives Conference (IEMDC).

[17]  Toomas Vaimann,et al.  Design of permanent magnet assisted synchronous reluctance machine , 2014, Proceedings of the 2014 15th International Scientific Conference on Electric Power Engineering (EPE).

[18]  S. Williamson,et al.  Direct finite element design optimisation of the cageless reluctance synchronous machine , 1996 .

[19]  Maarten J. Kamper,et al.  Flux barrier and skew design optimisation of reluctance synchronous machines , 2014, 2014 International Conference on Electrical Machines (ICEM).

[20]  Sonja Lundmark,et al.  A synchronous reluctance generator for a wind application-compared with an interior mounted permanent magnet synchronous generator , 2014 .

[21]  C. Sadarangani,et al.  Novel rotor design optimization of Synchronous Reluctance Machine for low torque ripple , 2012, 2012 XXth International Conference on Electrical Machines.

[22]  Michiel Hendrik Albertus Prins Design of a field-intensified interior permanent magnet synchronous machine for electric vehicle application , 2014 .

[23]  Maurizio Repetto,et al.  Design refinement of synchronous reluctance motors through finite-element analysis , 2000 .

[24]  Alfredo Vagati,et al.  Design criteria of high performance synchronous reluctance motors , 1992, Conference Record of the 1992 IEEE Industry Applications Society Annual Meeting.

[25]  K. Akatsu,et al.  Design and evaluation of a variable-flux flux-intensifying interior permanent magnet machine , 2012, 2012 IEEE Energy Conversion Congress and Exposition (ECCE).

[26]  D. Miljavec Torque ripple in synchronous reluctance motor , 1998, MELECON '98. 9th Mediterranean Electrotechnical Conference. Proceedings (Cat. No.98CH36056).

[27]  Gianmario Pellegrino,et al.  Automatic Design of Synchronous Reluctance Motors Focusing on Barrier Shape Optimization , 2015, IEEE Transactions on Industry Applications.

[28]  M. Sanada,et al.  Torque ripple improvement for synchronous reluctance motor using an asymmetric flux barrier arrangement , 2004, IEEE Transactions on Industry Applications.

[29]  L. Frantzis,et al.  Offshore Wind Market and Economic Analysis , 2013 .

[30]  G. Kimura,et al.  A study on torque ripple reduction of synchronous reluctance motor , 2001, 4th IEEE International Conference on Power Electronics and Drive Systems. IEEE PEDS 2001 - Indonesia. Proceedings (Cat. No.01TH8594).

[31]  N. Bianchi,et al.  Performance analysis of an IPM motor with segmented rotor for flux-weakening applications , 1999, IEMDC 1999.

[32]  J. Wang,et al.  Design optimisation of permanent magnet assisted synchronous reluctance machines for electric vehicle applications , 2012, 2012 XXth International Conference on Electrical Machines.

[33]  Dan M. Ionel,et al.  Establishing the Relative Merits of Synchronous Reluctance and PM-Assisted Technology Through Systematic Design Optimization , 2015, IEEE Transactions on Industry Applications.

[34]  M. J. Kamper,et al.  Design and performance of compensated reluctance synchronous machine drive with extended constant power speed range , 2012, 2012 IEEE Energy Conversion Congress and Exposition (ECCE).

[35]  Sai Sudheer Reddy Bonthu,et al.  Design procedure for multi-phase external rotor permanent magnet assisted synchronous reluctance machines , 2016, 2016 IEEE Applied Power Electronics Conference and Exposition (APEC).

[36]  Frede Blaabjerg,et al.  Active-flux based motion sensorless vector control of biaxial excitation generator/motor for automobiles (BEGA) , 2009, 2009 IEEE Energy Conversion Congress and Exposition.

[37]  Jos Unpingco,et al.  Python for Probability, Statistics, and Machine Learning , 2016 .

[38]  M. Reinlein,et al.  Torque ripple minimization of reluctance synchronous machines by continuous and discrete rotor skewing , 2015, 2015 5th International Electric Drives Production Conference (EDPC).

[39]  Freddy Magnussen,et al.  Novel rotor design optimization of synchronous reluctance machine for high torque density , 2012 .

[40]  Frede Blaabjerg,et al.  BEGA Starter/Alternator—Vector Control Implementation and Performance for Wide Speed Range at Unity Power Factor Operation , 2010, IEEE Transactions on Industry Applications.

[41]  Peter Sergeant,et al.  Synchronous Reluctance Motor Performance Based on Different Electrical Steel Grades , 2015, IEEE Transactions on Magnetics.

[42]  Nicola Bianchi,et al.  Multi-objective optimization of a PM Assisted Synchronous Reluctance Machine, including torque and sensorless detection capability , 2012 .

[43]  Sai Sudheer Reddy Bonthu,et al.  Optimal design of five-phase permanent magnet assisted synchronous reluctance motor for low output torque ripple , 2014, 2014 IEEE Energy Conversion Congress and Exposition (ECCE).

[44]  Fernando J. T. E. Ferreira,et al.  Beyond Induction Motors—Technology Trends to Move Up Efficiency , 2013, IEEE Transactions on Industry Applications.

[45]  Xiaoyong Zhu,et al.  Design and evaluation of a new flux-intensifying permanent magnet brushless motor , 2014, 2014 17th International Conference on Electrical Machines and Systems (ICEMS).

[46]  Stiaan Gerber A finite element based optimisation tool for electrical machines , 2011 .

[47]  Y. Honda,et al.  High performance synchronous reluctance motor with multi-flux barrier for the appliance industry , 1998, Conference Record of 1998 IEEE Industry Applications Conference. Thirty-Third IAS Annual Meeting (Cat. No.98CH36242).

[48]  N. Bianchi,et al.  Rotor Flux-Barrier Design for Torque Ripple Reduction in Synchronous Reluctance and PM-Assisted Synchronous Reluctance Motors , 2009, IEEE Transactions on Industry Applications.

[49]  Lauri Perkkio,et al.  Evaluation and comparison of different numerical computation methods for the electromagnetic torque in electrical machines , 2013, 2013 International Conference on Electrical Machines and Systems (ICEMS).

[50]  Nicola Bianchi,et al.  Sensitivity analysis of torque ripple reduction of synchronous reluctance and interior PM motors , 2013, 2013 IEEE Energy Conversion Congress and Exposition.

[51]  Gianmario Pellegrino,et al.  Design of synchronous reluctance machines with multi-objective optimization algorithms , 2013, 2013 IEEE Energy Conversion Congress and Exposition.

[52]  D. D. Reigosa,et al.  Novel Design of Flux-Intensifying Interior Permanent Magnet Synchronous Machine Suitable for Self-Sensing Control at Very Low Speed and Power Conversion , 2011, IEEE Transactions on Industry Applications.

[53]  Jian-Xin Shen,et al.  Evaluation of low-cost high-performance synchronous motors for ventilation application , 2015, 2015 International Conference on Sustainable Mobility Applications, Renewables and Technology (SMART).

[54]  Barrie Mecrow,et al.  Higher pole number synchronous reluctance machines with fractional slot concentrated windings , 2014 .

[55]  Marco Ferrari,et al.  Design of Synchronous Reluctance Motor for Hybrid Electric Vehicles , 2015, IEEE Transactions on Industry Applications.

[56]  F. Blaabjerg,et al.  BEGA-a biaxial excitation Generator for automobiles: comprehensive characterization and test results , 2005, IEEE Transactions on Industry Applications.

[57]  Joaquim R. R. A. Martins,et al.  Structural and Multidisciplinary Optimization Manuscript No. Pyopt: a Python-based Object-oriented Framework for Nonlinear Constrained Optimization , 2022 .

[58]  N. Bianchi,et al.  Permanent magnet volume minimization in permanent magnet assisted synchronous reluctance motors , 2013, 2013 Eighth International Conference and Exhibition on Ecological Vehicles and Renewable Energies (EVER).

[59]  Pragasen Pillay,et al.  A Novel Grain-Oriented Lamination Rotor Core Assembly for a Synchronous Reluctance Traction Motor With a Reduced Torque Ripple Algorithm , 2016, IEEE Transactions on Industry Applications.

[60]  Maarten J Kamper,et al.  Design optimisation of cageless flux barrier rotor reluctance synchronous machine , 1996 .

[61]  Shigeru Okuma,et al.  A new flux-barrier-type reluctance motor with a slit rotor , 1999, IEEE Trans. Ind. Electron..

[62]  N. Bianchi,et al.  Optimization of IPM motors with Machaon rotor flux barriers , 2010, Digests of the 2010 14th Biennial IEEE Conference on Electromagnetic Field Computation.

[63]  K. Schittkowski,et al.  NONLINEAR PROGRAMMING , 2022 .

[64]  Yi Du,et al.  Electromagnetic Performance Analysis and Verification of a New Flux-Intensifying Permanent Magnet Brushless Motor With Two-Layer Segmented Permanent Magnets , 2016, IEEE Transactions on Magnetics.

[65]  Thomas M. Jahns,et al.  A saturating lumped-parameter model for an interior PM synchronous machine , 2002 .

[66]  C. Sadarangani,et al.  New theoretical approach to the synchronous reluctance machine behavior and performance , 2008, 2008 18th International Conference on Electrical Machines.

[67]  Robert D. Lorenz,et al.  Design methodology for variable-flux, flux-intensifying interior permanent magnet machines for an electric-vehicle-class inverter rating , 2013, 2013 IEEE Energy Conversion Congress and Exposition.

[68]  Jan A Snyman,et al.  Practical Mathematical Optimization: An Introduction to Basic Optimization Theory and Classical and New Gradient-Based Algorithms , 2005 .

[69]  R. Marler,et al.  The weighted sum method for multi-objective optimization: new insights , 2010 .

[70]  A. Fratta,et al.  Evaluation of torque ripple in high performance synchronous reluctance machines , 1993, Conference Record of the 1993 IEEE Industry Applications Conference Twenty-Eighth IAS Annual Meeting.

[71]  N. Bianchi,et al.  An Analytical Approach to Design the PM in PMAREL Motors Robust Toward the Demagnetization , 2016, IEEE Transactions on Energy Conversion.

[72]  Thomas A. Lipo,et al.  Rotor design optimization of synchronous reluctance machine , 1994 .

[73]  Gianmario Pellegrino,et al.  Effect of the numbers of slots and barriers on the optimal design of synchronous reluctance machines , 2014, 2014 International Conference on Optimization of Electrical and Electronic Equipment (OPTIM).

[74]  Jiabin Wang,et al.  Design optimisation and performance evaluation of a rare-earth-free Permanent Magnet Assisted Synchronous Reluctance Machine for electric vehicle traction , 2014 .

[75]  Jung-Ho Lee,et al.  Rotor optimum design on Torque Ripple Reduction for a Synchronous Reluctance Motor with Concentrated Winding using RSM , 2007, 2007 IEEE International Electric Machines & Drives Conference.

[76]  Ronghai Qu,et al.  Rotor design considerations for a variable-flux flux-intensifying interior permanent magnet machine with improved torque quality and reduced magnetization current , 2015, 2015 IEEE Energy Conversion Congress and Exposition (ECCE).

[77]  Maurizio Repetto,et al.  Improvement of synchronous reluctance motor design through finite-element analysis , 1999, Conference Record of the 1999 IEEE Industry Applications Conference. Thirty-Forth IAS Annual Meeting (Cat. No.99CH36370).

[78]  Johannes H. J. Potgieter Optimal topology and critical evaluation of slip synchronous permanent magnet wind generator , 2014 .

[79]  Marco Ferrari,et al.  Experimental Comparison of PM-Assisted Synchronous Reluctance Motors , 2014, IEEE Transactions on Industry Applications.

[80]  Maarten J. Kamper,et al.  Asymmetric Flux Barrier and Skew Design Optimization of Reluctance Synchronous Machines , 2015, IEEE Transactions on Industry Applications.

[81]  Fengge Zhang,et al.  Simulation and Experimental Analysis of a Brushless Electrically Excited Synchronous Machine With a Hybrid Rotor , 2015, IEEE Transactions on Magnetics.

[82]  M. Villani,et al.  Magnetic analysis of flux barriers Synchronous Reluctance Motors , 2008, 2008 18th International Conference on Electrical Machines.

[83]  Ren-Jye Yang,et al.  Optimal topology design using linear programming , 1994 .

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

[85]  Rik W. De Doncker,et al.  Torque ripple reduction in Reluctance Synchronous Machines using an asymmetric rotor structure , 2014 .

[86]  Huang Shaogang,et al.  Analysis of biaxial excitation generator/motor for automobiles using tooth flux method , 2011, 2011 International Conference on Electrical Machines and Systems.

[87]  M. Obata,et al.  Performance of PMASynRM With Ferrite Magnets for EV/HEV Applications Considering Productivity , 2014, IEEE Transactions on Industry Applications.

[88]  Frede Blaabjerg,et al.  BEGA Starter/Alternator—Vector Control Implementation and Performance for Wide Speed Range at Unity Power Factor Operation , 2010 .

[89]  C. Gerada,et al.  Barriers shapes and minimum set of rotor parameters in the automated design of Synchronous Reluctance machines , 2013, 2013 International Electric Machines & Drives Conference.

[90]  Jasbir S. Arora,et al.  Jan A. Snyman, Practical Mathematical Optimization: An introduction to basic optimization theory and classical and new gradient-based algorithms , 2006 .

[91]  J. K. Kostko Polyphase reaction synchronous motors , 1923, Journal of the American Institute of Electrical Engineers.

[92]  Christiaan Willem Vorster Design of a reluctance synchronous machine for an electric vehicle with a multi speed gearbox , 2014 .

[93]  Marco Ferrari,et al.  Rotor saturation impact in synchronous reluctance and PM assisted reluctance motors , 2013, 2013 IEEE Energy Conversion Congress and Exposition.

[94]  W. C. Andrews,et al.  The American Institute of Electrical Engineers , 1923, Nature.

[95]  Reza Rajabi Moghaddam,et al.  Synchronous Reluctance Machine (SynRM) in Variable Speed Drives (VSD) Applications , 2011 .