Multi-physic analysis of electromechanical systems via field reconstruction method

Field Reconstruction Method (FRM) represents superior performance in analysis and synthesis of electromechanical actuators. The capability of the FRM in providing high precision results in prediction of the electromagnetic field, forces, fluxes, etc. has been proven for a variety of electric drives while taking several orders of magnitude less time as compared to Finite Element (FE) counterparts. This has been accomplished by replacing redundant numerical procedures that are typically used in FE for solving Poisson's partial differential equation in a periodic framework. Furthermore, formulation of the FRM has been constructed such that it can accommodate a seamless interface with external power electronic circuits. This has effectively resulted in (a) Simulation of the electromechanical converter occurring at the same time scale as switching frequencies used in typical high power electronic circuits( This has not been a possibility in the past as the computational time of FE methods are typically extremely higher than control time constants in the power converter), and (b) due to the decoupled formulation of the FRM in which contributions of the magnetic design and excitation are separated, optimization of the drive performance under fault conditions, desired optimum performances can be systematically tailored. It is desirable to extend similar formulation used in FRM to cover similar field problems that are currently solved using FE method. This includes structural and thermal field problems that are of high importance in precise evaluation of the performance and feasibility studies in electromechanical actuators. Due to its time-effectiveness, successful augmentation of the FRM method to cover multi-physic problems generates a substantial impact in other relevant fields of engineering that are used in design and control of the next generation of ships and renewable wind generators. The present paper reports on application of the FRM technique for solving Magneto-structural problems in electromechanical converters.

[1]  Thomas M. Jahns,et al.  Pulsating torque minimization techniques for permanent magnet AC motor drives-a review , 1996, IEEE Trans. Ind. Electron..

[2]  B. Fahimi,et al.  On the effect of stator excitation on radial and tangential flux and force densities in a permanent magnet synchronous machine , 2005, IEEE International Conference on Electric Machines and Drives, 2005..

[3]  B. Fahimi,et al.  A field reconstruction method for optimal excitation of permanent magnet synchronous machines , 2006, IEEE Transactions on Energy Conversion.

[4]  Paul C. Krause,et al.  Analysis of electric machinery , 1987 .

[5]  B. Fahimi,et al.  Optimal excitation of permanent magnet synchronous machines via direct computation of electromagnetic force components , 2005, IEEE International Conference on Electric Machines and Drives, 2005..

[6]  D.C. Hanselman,et al.  Minimum torque ripple, maximum efficiency excitation of brushless permanent magnet motors , 1994, IEEE Trans. Ind. Electron..

[7]  S. Pekarek,et al.  Investigation of Force Generation in a Permanent Magnet Synchronous Machine , 2007, IEEE Transactions on Energy Conversion.

[8]  R. Tirnovan,et al.  Analysis of feed currents influence on the electromagnetic forces in AC brushless motor with outer rotor , 2003, IEEE International Electric Machines and Drives Conference, 2003. IEMDC'03..

[9]  S.K. Panda,et al.  Torque ripple minimization in PM synchronous motors using iterative learning control , 2004, IEEE Transactions on Power Electronics.

[10]  H.A. Toliyat,et al.  Five-Phase Interior Permanent-Magnet Motors With Low Torque Pulsation , 2005, IEEE Transactions on Industry Applications.

[11]  B. Fahimi.  Qualitative approach to electromechanical energy conversion: Reinventing the art of design in adjustable speed drives , 2007, 2007 International Conference on Electrical Machines and Systems (ICEMS).

[12]  M. Moallem,et al.  Mitigation of Torque Ripple in Interior Permanent Magnet Motors by Optimal Shape Design , 2006, IEEE Transactions on Magnetics.

[13]  Taehyung Kim,et al.  Reducing Torque Pulsation of Multi-Phase Interior Permanent Magnet Machines , 2006, Conference Record of the 2006 IEEE Industry Applications Conference Forty-First IAS Annual Meeting.

[14]  D. C. Hanselman,et al.  Effect of skew, pole count and slot count on brushless motor radial force, cogging torque and back EMF , 1997 .

[15]  M. Moallem,et al.  Qualitative Investigation of Force Density Components in Electromechanical Energy Conversion Process , 2006, IECON 2006 - 32nd Annual Conference on IEEE Industrial Electronics.