Linear Drive Systems and their Related Technologies. Three-Dimensional Finite Element Analysis of Linear Induction Motors with a skewed ladder-type secondary.

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  • リニアドライブと関連技術　三次元有限要素法によるｓｋｅｗを施したラダー形リニア誘導モータの特性解析
  • 3ジゲン ユウゲン ヨウソホウ ニ ヨル skew オ ホドコシタ ラダーガタ

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Abstract

The slot harmonics produce a cogging torque and a crawling in a linear induction motor (LIM) with a ladder type rotor. To avoid those defects, we sometimes adopt the V-skewed rotor (or stator) which rise no lateral force. In this paper, we investigate the skew effect by the three-dimensional finite element analysis with A-φ method and specify significant points for adopting skewed slots.<br>Based on the above approach, we evaluate the skew effect in the LIM, comparing it with the experimental data to confirm the validity of the analysis. The follows are confirmed: (1) the improvement of the cogging torque by introducing V-skewed rotor; (2) the decrease in the thrust force and increase in the sucking force as making the skew angle bigger, and the abnormal temperature rising in V-skewed rotor; (3) the decrease of the abnormal temperature rising by optimizing the shape of rotor; (4) the validity of the skewed stator for short stator machines. And we propose a method that put two stators skewed in the opposite direction to each other for the double-sided LIM.

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