Abstract
The important problems to be solved in Linear Switched Reluctance Machines (LSRMs) are: (1) to design the shape and size of poles in stator and translator cores; (2) to optimize their geometrical configuration. A novel stator geometry for LSRMs that improved the force profile was presented in this study. In the new geometry, pole shoes were affixed on the stator poles. Static and dynamic characteristics for the proposed structure had been highlighted using Two Dimensional (2-D) Finite Element Analyses (FEA). Motor performance for variable load conditions was discussed. The finite element analyses and the experimental results of this study proved that, LSRMs were one of the strong candidates for linear propulsion drives. Problem statement: To mitigate the force ripple without any loss in average force and force density. Approach: Design modifications in the magnetic structures. Results: 2-D finite element analysis was used to predict the performance of the studied structures. Conclusion/Recommendations: The proposed structure not only reduces the force ripple, also reduced the volume and mass. The future study is to make an attempt on vibration, thermal and stress analyses.
Highlights
Linear switched reluctance motors are an attractive alternative to linear induction or synchronous machines due to lack of windings on the stator or translator structure, easier manufacturing and maintenance, good fault tolerance capability (Miller, 1993)
This study is dedicated to the longitudinal flux Linear Switched Reluctance Machines (LSRMs)
Force ripple analysis using an alternative geometry: Definition, sources of the force ripple and techniques to reduce it: Assuming that the maximum value of the static force as Fmax, the minimum value that occurs at the intersection point of two consecutive phases as Fmin and the average force as Favg, the percentage force ripple may be defined as: Corresponding Author: N.C
Summary
Linear switched reluctance motors are an attractive alternative to linear induction or synchronous machines due to lack of windings on the stator or translator structure, easier manufacturing and maintenance, good fault tolerance capability (Miller, 1993). LSRMs are classified as (a) longitudinal flux (b) transverse flux. This study is dedicated to the longitudinal flux LSRM. A design procedure for longitudinal-flux LSRM has been described in (Byeong-Seok et al, 2000). Other types of longitudinal-flux LSRMs are presented in (Chayopitak and Taylor, 2005), with coupled flux paths and in (Sun et al, 2008) with uncoupled flux paths for a magnetic levitation system. A high force longitudinalflux double-sided double-translator LSRM has been analyzed in (Deshpande et al, 1995).
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