Loss calculation of induction motors considering harmonic electromagnetic field in stator and rotor

A method of loss calculation for induction motors is proposed. The combined 3D–2D time-stepping finite element analysis is carried out to obtain the copper loss and the time variation of the magnetic field in the motor. The iron loss is calculated approximately considering the time variation of the magnetic field direction and the minor hysteresis loops caused by the time-harmonic fields using practical computer resources. The proposed method is applied to four types of induction motors, which are the solid rotor induction motors with/without slot and the cage induction motors with/without skew. The measured and the calculated total losses and the iron losses agree well in all cases. The differences of the loss distributions of each motor are also compared and investigated. © 2004 Wiley Periodicals, Inc. Electr Eng Jpn, 147(2): 63–73, 2004; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/eej.10305

[1]  N. Sadowski,et al.  Evaluation and analysis of iron losses in electrical machines using the rain-flow method , 2000 .

[2]  T. Wakisaka,et al.  Rotational Iron Losses and Their Estimation in Electrical Steel Sheets , 1997 .

[3]  Frede Blaabjerg,et al.  On the energy optimized control of standard and high-efficiency induction motors in CT and HVAC applications , 1997 .

[4]  Katsumi Yamazaki.  Induction motor analysis considering both harmonics and end effects using combination of 2D and 3D finite element method , 1997 .

[5]  Yoji Takeda.  新たなる進展．永久磁石電動 Ｉ 永久磁石同期電動機とその制御技術の進歩;新たなる進展．永久磁石電動 Ｉ 永久磁石同期電動機とその制御技術の進歩;Coming Stage of Permanent Magnet Motors and Controls. Progress in Permanent Magnet Motors and Control. , 1999 .

[6]  S. Williamson,et al.  The variation of cage motor losses with skew , 1998, Conference Record of 1998 IEEE Industry Applications Conference. Thirty-Third IAS Annual Meeting (Cat. No.98CH36242).

[7]  S. L. Ho,et al.  Estimation of stray losses of skewed rotor induction motors using coupled 2-D and 3-D time stepping finite element methods , 1998 .

[8]  Ronnie Belmans,et al.  Energy efficiency of induction machines , 2000 .

[9]  Andrew M. Knight,et al.  The design of high-efficiency line-start motors , 1999, Conference Record of the 1999 IEEE Industry Applications Conference. Thirty-Forth IAS Annual Meeting (Cat. No.99CH36370).