A Simple 2-D Finite-Element Geometry for Analyzing Surface-Mounted Synchronous Machines With Skewed Rotor Magnets

We present a new 2-D FEM-based system for analyzing permanent-magnet surface-mounted synchronous machines with skewed rotor magnets. The system is based on generating a geometric equivalent non-skewed permanent-magnet distribution that accounts for the skewed distribution of the practical rotor. An appealing feature of the proposed system is that it can be easily performed in any 2-D electromagnetic FEM package by performing a simple change in the geometry of the magnets. Attributes of the method presented here include simplicity, high accuracy, low computational burden, and high speed compared to 3-D and 2-D multislice FEM analysis. Experimental results with both healthy and faulty machines corroborate the effectiveness of the model proposed in this work.

[1]  Sanjay Marwaha,et al.  FINITE ELEMENT METHOD AS AN AID TO MACHINE DESIGN: A COMPUTATIONAL TOOL , 2009 .

[2]  George J. Wakileh.  Harmonics in rotating machines , 2003 .

[3]  L. Romeral,et al.  Detection of Demagnetization Faults in Permanent-Magnet Synchronous Motors Under Nonstationary Conditions , 2009, IEEE Transactions on Magnetics.

[4]  D.G. Dorrell,et al.  A Multi-Sliced Finite Element Model for Induction Machines Incorporating Inter-bar Current , 2006, Conference Record of the 2006 IEEE Industry Applications Conference Forty-First IAS Annual Meeting.

[5]  E. Schmidt,et al.  Calculation of Position-Dependent Inductances of a Permanent Magnet Synchronous Machine With an External Rotor by Using Voltage-Driven Finite Element Analyses , 2009, IEEE Transactions on Magnetics.

[6]  D.G. Dorrell,et al.  A Multisliced Finite-Element Model for Induction Machines Incorporating Interbar Current , 2009, IEEE Transactions on Industry Applications.

[7]  Seok-Myeong Jang,et al.  Design criteria for detent force reduction of permanent-magnet linear synchronous motors with Halbach array , 2002 .

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

[9]  Liwei Song,et al.  Development of PMSM Drives for Hybrid Electric Car Applications , 2007, IEEE Transactions on Magnetics.

[10]  J. Faiz,et al.  Static Eccentricity Fault Diagnosis in Permanent Magnet Synchronous Motor Using Time Stepping Finite Element Method , 2008, IEEE Transactions on Magnetics.

[11]  Jordi-Roger Riba Ruiz,et al.  Demagnetization diagnosis in permanent magnet synchronous motors under non-stationary speed conditions , 2010 .

[12]  Geun-Ho Lee,et al.  Torque Ripple Reduction of Interior Permanent Magnet Synchronous Motor Using Harmonic Injected Current , 2008, IEEE Transactions on Magnetics.

[13]  C.B. Rasmussen,et al.  Analysis and Effects of Inter-Bar Current and Skew on a Long Skewed-Rotor Induction Motor for Pump Applications , 2007, IEEE Transactions on Magnetics.

[14]  V. J. Lázaro Joares,et al.  Analysis of skewed slots in induction machines by using 2D finite element method , 1998 .

[15]  In-Soung Jung,et al.  3-D analysis of permanent magnet linear synchronous motor with magnet arrangement using equivalent magnetic circuit network method , 1999 .

[16]  A. Merkhouf,et al.  Analysis of large synchronous machines with axial skew, part 1: flux density and open-circuit voltage harmonics , 2009 .

[17]  Renato Carlson,et al.  The effect of the stator-slot opening on the interbar currents of skewed cage induction motor , 2002 .

[18]  Dieter Gerling,et al.  Skewing effect on the PM Flux-Linkage high harmonics of the PM machines with delta winding , 2009, 2009 13th European Conference on Power Electronics and Applications.

[19]  Y. Kawase,et al.  Effects of Skew Angle of Rotor in Squirrel-Cage Induction Motor on Torque and Loss Characteristics , 2009, IEEE Transactions on Magnetics.

[20]  T.D. Kefalas,et al.  Special air-gap element for 2-D FEM analysis of electrical Machines accounting for rotor skew , 2005, IEEE Transactions on Magnetics.

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

[22]  C. Sadarangani,et al.  Winding factors and Joule losses of permanent magnet machines with concentrated windings , 2003, IEEE International Electric Machines and Drives Conference, 2003. IEMDC'03..

[23]  Luis Romeral,et al.  Modeling of Surface-Mounted Permanent Magnet Synchronous Motors With Stator Winding Interturn Faults , 2011, IEEE Transactions on Industrial Electronics.