Stator Core with Slits in Transverse Flux Rotary Machine to Reduce Eddy Current Loss

This paper presents an eddy current loss analysis for a transverse flux rotary machine (TFRM) with laminated stator cores, which consist of inner and outer cores whose laminated directions are perpendicular to each other. Although the TFRM is laminated to reduce eddy current losses, it still exhibits rapidly increasing core losses as the frequency increases. To solve this problem, slits are introduced to the stator outer core. 3-dimensional finite element analysis (3D FEA) based on the T- Ω formulation is used to solve the eddy-current problem for a various numbers of slits in the nonlinear lamination core. The effects of the slits are confirmed using experiment data and 3D FEA results.

[1]  T. Onuki,et al.  3D eddy current analysis by the finite element method using double nodes technique , 1996 .

[2]  Songhee Cheon,et al.  The Effect of a Pulsed Electromagnetic Field with Time on Pain in Muscle Crushed Rat Model , 2012 .

[3]  Antero Arkkio,et al.  Axial Flux and Eddy-Current Loss in Active Region of a Large-Sized Squirrel-Cage Induction Motor , 2010, IEEE Transactions on Magnetics.

[4]  K. Fujiwara,et al.  Loss Calculation of Reactor Connected to Inverter Power Supply Taking Account of Eddy Currents in Laminated Steel Core , 2009, IEEE Transactions on Magnetics.

[5]  Jung-Pyo Hong,et al.  Comparative Study of Stator Core Composition in Transverse Flux Rotary Machine , 2011 .

[6]  Barrie Mecrow,et al.  The modelling of segmented laminations in three dimensional eddy current calculations , 1992 .

[7]  N. Takahashi,et al.  Study of eddy-current loss reduction by slit in Reactor core , 2005, IEEE Transactions on Magnetics.

[8]  K. Yamazaki,et al.  Loss Analysis of Permanent-Magnet Motors With Concentrated Windings—Variation of Magnet Eddy-Current Loss Due to Stator and Rotor Shapes , 2009 .

[9]  K. Takahashi,et al.  Eddy Current Analysis Considering Lamination for Stator Core Ends of Turbine Generators , 2008, IEEE Transactions on Magnetics.

[10]  D. Lin,et al.  Nonlinear T- $\Omega$ Formulation Including Motion for Multiply Connected 3-D Problems , 2008, IEEE Transactions on Magnetics.

[11]  Sang-Hyun Jeong,et al.  Design and Experiment of an Electromagnetic Vibration Exciter for the Rapping of an Electrostatic Precipitator , 2012 .

[12]  G. G. Stokes.  "J." , 1890, The New Yale Book of Quotations.