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

Abstract

This paper presents the review of design variables optimization and control strategies of a Linear Switched Reluctance Actuator (LSRA). The introduction of various type of linear electromagnetic actuators (LEA) are compared and the advantages of LSRA over other LEA are discussed together with the type of actuator configurations and topologies. The SRA provides an overall efficiency similar to induction actuator of the similar rating, subsequently the friction and windage losses are comparable but force density is better. LSRA has the advantage of low cost, simple construction and high reliability compare to the actuator with permanent magnet. However, LSRA also has some obvious defects which will influence the performance of the actuator such as ripples and acoustic noise which are caused by the highly nonlinear characteristics of the actuator. By researching the design variables of the actuator, the influences of those design variables are introduced and the detail comparisons are analyzed in this paper. In addition, this paper also reviews on the control strategies in order to overcome the weaknesses of LSRA. Keyword:Actuator INTRODUCTIONLinear electromagnetic actuators (LEA) is a mechanism that generate linear motion due to the interactions of the magnetic fields and electromagnetic thrust. The major advantage of electromagnetic actuators over the conventional actuators is that it is almost maintenance free which is due to the absence of mechanical part such as gears The typical design of LEA can be characterized as three topologies: (i) Planar Single Sided; (ii) Planar Double Sided; (iii) Tubular. By comparison, the tubular topology of LEA has greater force density compare to planer topology actuator due to lesser flux leakage and tubular topology actuator minimized the stray magnetic field in the direction of travel along the stator and mover part [5]. Hence, the thrust force and

Geometry and Topology Optimization of Switched Reluctance Machines: A Review

“…The influence of different stator and translator geometric parameters of planar and tuber LSRMs on the electromagnetic force and electromagnetic force ripples were studied in [185] and [186]. In [185], the number of phases, pole stroke (distance covered by the translator's teeth from two consecutive aligned positions when two successive phases are excited), and the current density were optimized to The study in [186] shows that increasing the translator pole width of single-sided LSRM, Fig. 10, increases the trust force but decreases the specific force of the machine at the same time.…”

“…The study also shows that increasing the translator pole pitch increasing the trust force but increases the cogging force at the same time. The stator pole width has to be carefully selected to maximize the average trust force and minimize the force ripples of that machine [186]. The effect of the stator pole shoe shape of the single-sided LSRM is also discussed in [186].…”

“…The stator pole width has to be carefully selected to maximize the average trust force and minimize the force ripples of that machine [186]. The effect of the stator pole shoe shape of the single-sided LSRM is also discussed in [186]. One way to maximize the thrust force and minimize the force ripple is to optimize the skew and taper angles of stator poles [186].…”

“…The effect of the stator pole shoe shape of the single-sided LSRM is also discussed in [186]. One way to maximize the thrust force and minimize the force ripple is to optimize the skew and taper angles of stator poles [186]. One of the critical parameters of the LSRM is the airgap length, the length of the gap between the translator and the stator.…”

“…One of the critical parameters of the LSRM is the airgap length, the length of the gap between the translator and the stator. The length reduction increases the trust force but increases the force ripple at the same time, so this parameter should be carefully optimized based on the application needs [186].…”