Abstract
Linear induction motors have recently played an important role in positioning linear motion. However, they suffer a low level of precision for very low speed application. For improving the precision of LIM, especially in very low speed application – high-performance motor – the existence of cogging forces due to the magnetic conductance of air gap variation or interactive magnetic edge and end effect variation in the ladder-secondary single-sided linear induction motor (LSLIM) should be reduced as small as possible. This paper developed two simple magnetic circuits: one-slot and multi-slot model. The cogging forces analysis will be concerned with magnetic energy variation in the air gap. Based on magnetic conductance inparalleland series structures, analysis of RCE will be done by implementation of Kirchoff law number one and number two. It shows that analytical result trends are close to the experimental results and finite element method software. This paper provides the prediction of a close form of the mathematical model of maximum cogging forces for single-side linear induction motors. So, those results can contribute one aspect in related designing a physical single or double-sided linear induction motor. The variation of flux densities in the air gap in the middle region of LSLIM can give some contribution for calculating cogging forces, and different variation of leakage magnetic path fields in the end region can reduce the magnitude of flux densities in the air gap, but cogging forces in the end region can cancel each other
Highlights
Nowadays, high-precision stages are required in many fields such as semiconductor industry, precision machining tools, data storage equipment and so on [1]
According to the last calculation, the fringing effect based on Reluctance Network Equivalent (RNE) approximation supported by magnetic path estimation provided the improvement of calculation results
The fringing coefficient was based on this method in which the calculation flux scattering was taken into account and the effective air gap length was used in the cogging forces equations
Summary
High-precision stages are required in many fields such as semiconductor industry, precision machining tools, data storage equipment and so on [1]. Due to the cogging forces of ladder secondary linear induction motors have a high nonlinear characteristic, the prediction of cogging forces using the one dimension field method can not estimate the cogging forces precisely [3]. The finite element method for calculation of the cogging forces is relatively time-consuming, and is not appropriate for determining their optimal dimensions so as to minimize cogging [Zhu]. In order to increase the precision of the method, the two-dimensional field (2D-3D) method has been developed in the prediction of cogging forces. This method is complicated and time-consuming [4]
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