Abstract: sThe problem in improving the high positioning precision of
permanent magnet linear synchronous motor (PMLSM) is the large detent force
that is caused by the attraction between the permanent magnet (PM) and the iron
core without input current. This detent force can be divided into two
components: the slot effect and the end effect. In this paper we propose a
novel method to reduce the detent force by employing the optimal designed
auxiliary poles. To investigate the characteristics of the detent force of
PMLSM with auxiliary poles, the width, position, and height of auxiliary poles
are chosen as the optimal factors and the two dimensional (2-D) finite element
method (FEM) is used to predict to the values of detent force with different
combinations of these three factors. And then the structure of auxiliary poles
is optimized by the response surface method (RSM) through the fractional
factorial design (FFD). Finally, the effectiveness of our proposed technique is
verified by both the numerical calculations and experimental results.
Keywords: Permanent magnet linear synchronous motor, detent force, optimal design, finite element method, response surface method
