Torque Ripple Analysis of Synchronous Reluctance Motor with Different Rotor Topologies for Application with Dimensional
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ORIGINAL ARTICLE
Torque Ripple Analysis of Synchronous Reluctance Motor with Different Rotor Topologies for Application with Dimensional Constraint M. A. H. Rasid1 · Vincent Lanfranchi2 · Alejandro Ospina2 · Khadija El Kadri Benkara2 Received: 28 January 2020 / Revised: 24 June 2020 / Accepted: 20 July 2020 © The Korean Institute of Electrical Engineers 2020
Abstract Synchronous reluctance machine (SynRM) is reemerging as a thermally robust and inexpensive actuator solution mainly due to the lack of permanent magnet. Added to that, the possibilities of having different rotor topologies make it very versatile where further optimization is possible depending on the objective, be it cost, ease of fabrication, power output, or torque quality. In an application where the outer dimension of the motor is strictly limited, this paper compares quantitatively and qualitatively the torque ripple of three SynRM machines of the same stator dimension equipped with different rotor topologies: segmented, tooth and flux barrier. Using an experimentally validated FE model, the torque ripple and the ripple’s harmonic content are compared at maximum load (stator current, IS = 50 A) and load angle (β = π/4). The machine adopting the flux-barrier rotor was shown to have the best torque quality (41% ripple), followed by tooth rotor (78% ripple) and finally segmented rotor (105% ripple). The harmonic contents are also presented and analyzed. Keywords SynRM machine · Torque ripple · Rotor topology · Segmented rotor · Flux-barrier rotor · Solid rotor · Harmonic contents
1 Introduction
1.1 SynRM Rotor Topology
The ongoing electrification in all applications has pushed the design of electrical machines to a new level. Regular and traditional induction machines and other Brushless and DC motor are insufficient. All topologies are being rediscovered and studied and optimized to satisfy different needs of different applications. Synchronous reluctance machine (SynRM) which is a category of variable reluctance machine is one of them. It has been a motor with great strength regarding thermal robustness. SynRM with a passive rotor has a large advantage, having a minimum heat source and easy heat evacuation (due to the location of winding on stator solely) [1–5].
Another very strong advantage is that it has numerous different topologies of rotor that can be adopted. SynRM is therefore very versatile where further optimization is largely possible depending on the objective, be it cost, ease of fabrication, power output, or torque quality. There are four major categories of rotor: tooth rotor, segmented rotor, flux-barrier rotor, and axiallylaminated rotor (Fig. 1). Tooth rotor is the simplest and the most elementary form of variable reluctance rotor. It is usually constructed as a tooth massive piece, hold by a shaft. Its design has a simple and rigid structure but a low saliency ratio especially for a small size motor and consequently poor performance due to high quadrature permeance. However, the rigid structure creates the possibility o
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