Analysis of the Motor Asymmetry Caused by the Static Longitudinal End Effect

Static longitudinal end effect caused by truncated iron and coil windings is the inherent characteristic of linear motors. For multi-segment long primary double-sided linear induction motors (LP-DSLIM), subsection power supply mode result in longer iron than excited coil windings that enhances the static longitudinal end effect, thus aggravating the motor asymmetry. We deduce the analytic expression of pulsating magnetic field and electric potential, and analyze the influence between number of poles, length of end iron on the motor asymmetry. The results show that the motor asymmetry of the even pole motor is enhanced with the increase of end iron length, and is decreased with the increase of the pole number. Theory analysis, which is validated by simulation experiments, could be the reference for the optimal design and performance analysis of LP-DSLIM.