The Influence of the Secondary Thickness on the Air-Gap Magnetic Felid and Losses of the Linear Induction Motor

Abstract

The high-order space harmonics exist in the airgap magnetic felid of the linear induction motors, and the large harmonic components could lead to increase of the vibration and noise in the motors. The secondary thickness is a very important factor which influences the harmonic components of the air-gap magnetic felid. In this paper, the finite element method is adopted to calculate the air-gap flux densities of the linear induction motors with the flat secondary. The distribution of the harmonic in the air-gap magnetic felid is given, and the harmonic distortions and thrust ripples with the different thickness of the reaction plate and are calculated and compared, as well as the influence on the iron core loss and eddy current loss of secondary are calculated and analyzed.