A Novel Linear Switched Reluctance Machine: Analysis and Experimental Verification

Abstract

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.

A Review: Design Variables Optimization and Control Strategies of a Linear Switched Reluctance Actuator for High Precision Applications

“…By varying the stator pole width, the actuator able to produce larger average thrust force with lower force ripple [28]. Nevertheless, when the stator pole width is increased, the average thrust force produce has found to be reduced after a certain width due to dead zone [28]. The dead zone happened when the maximum inductance occurred with no contribution on the generation of propulsion force.…”

“…One of the important criteria in designing an electromagnetic actuator is the handiness to produce maximum average thrust force with low force ripple. By varying the stator pole width, the actuator able to produce larger average thrust force with lower force ripple [28]. Nevertheless, when the stator pole width is increased, the average thrust force produce has found to be reduced after a certain width due to dead zone [28].…”

“…In the study of Lenin et al [28] on single-sided LSRA and Amoros et al [27] on double-sided LSRA, the study found that increasing the length of the translator pole will improve the average thrust force. The coils of the designed actuator is located at the translator part.…”

“…In the next section, the reviews will discuss on the influence of the design variable of LSRA to its output. Lenin et al [28] described the influence the translator pole width on single-sided LSRA as in Figure 2(a). The increasing of the translator pole width will directly increase the average generated thrust force by 0.25N for every 1mm.…”

“…Hence, another two approaches are used for ripple reduction which are; i.e. : (i) determine the waveform of the input excitation current profile by using an electronic control of power controllers or (ii) change the geometrical structure of the stator or translator pole [28], [36].…”