Influence of end effect on long primary double sided linear induction motor
                                                        LIU Xi jun, WEI Lin, ZHU Xin yu, GAO Li xia
                    (Aviation Engineering Institute, Civil Aviation Flight University of China, Guanghan 618307, China)

Abstract: Aiming at the synthetic magnetic field distortion caused by the end effect of the change of the pole pitch on the variable polar distance of the double sided linear induction motor,the theory of the field theory and the theoretical equation of the end effector of the linear induction motor were deduced,according to the magnetic field air gap flux density and the equivalent circuit. The influence of the end effect parameters on the air gap magnetic field of the motor, such as the end attenuation parameter, the end attenuation parameter and the traveling wave wavelength were analyzed by using the electromagnetic field analysis method and the equivalent circuit analysis method respectively. The model of the linear induction motor with varying pole pitch was established and the influence of the change of the pole pitch on the end effect parameters and the air gap magnetic field of the motor were analyzed. The results indicate that the influence of the pole pitch on the lateral end is small but is great on the longitudinal end. The pole pitch increases and the effect of the longitudinal end effect decreases.

Key words: long primary double sided linear induction motor; traveling wave magnetic field; end effect; variable polar distance