On the influence of the pole and teeth shapes on the performance of linear switched reluctance actuator

• Published in: Compel Vol. 30; no. 2; pp. 412 - 430
• Main Authors: Espírito-Santo, A.E., Calado, M.R.A., Cabrita, C.M.P.
• Format: Journal Article
• Language: English
• Published: Bradford Emerald Group Publishing Limited 01-01-2011
• Subjects: Actuators; CAD; Computer aided design; Construction; Electronics; Finite element analysis; International; Mathematical analysis; Mathematical models; Minimization; Poles; Reluctance; Studies; Teeth; Thrust force; Actuators; Electromechanical devices; Force measurement; Finite element analysis; Computer aided design; Linear motion
• ISSN: 0332-1649; 2054-5606
• DOI: 10.1108/03321641111101005

Purpose - The purpose of this paper is the evaluation of the influence of pole and teeth shapes on the behaviour of a linear switched reluctance actuator (LSRA). The study was carried out through the application of a finite element static analysis and the application of a new method for dynamic analysis. Those studies are thereafter evaluated with experimentations.Design methodology approach - The paper characterizes the performance of an LSRA for different polar geometries. A finite element tool is used at an early research stage. Results are then used to build a dynamic numerical model. Obtained data allow the construction of a laboratory prototype.Findings - Polar shape has great influence in actuator behaviour. Different geometrical polar configurations are evaluated and their influence is observed. The obtained data allow attraction force minimization with minimal penalty in the thrust force. A numerical dynamic model is used to evaluate actuator movement with different polar shapes, without taking into consideration the influence of magnetic losses.Practical implications - This paper allows the knowledge of each pole shape configuration to be adopted according to the actuator application and desired performance.Originality value - This paper presents the effect of the different pole shapes on the behaviour of static and dynamic characteristics of the LSRA. It is shown that the use of non-traditionally pole shapes, round or wedge, leads to a small penalty in thrust force and a considerable attraction force minimization. The benefit in actuator effects concerning mechanical structure and performance is evident.