Design of a Novel PM-Assisted Synchronous Reluctance Motor Topology Using V-Shape Permanent Magnets for Improvement of Torque Characteristic

Abstract

This paper presents the design and analysis of a novel topology for a Permanent Magnet Assisted Synchronous Reluctance Motor (PM-assisted-SynRM). The proposed topology presents a simple structure that incorporates the assistance of an internally inserted V-shape permanent magnet (IVPM) machine and also a Synchronous Reluctance Machine (SynRM). The main novelty in this paper is that, the permanent magnets in the rotor are diverted so that the reluctance component of the torque and the magnetic component of the torque reach their maximum values at the same load angle that can eventually leads to a higher output torque in the same volume. To further highlight the advantages of the proposed topology to the conventional topologies, its characteristics including, air gap flux density, electromagnetic torque, and back electromotive force (Back-EMF), are compared to a conventional PM-assisted-SynRM. The key improvement of the proposed topology is that, it features a higher torque density while consuming fewer amounts of permanent magnets which is very beneficial in mass productions. Finally, by using the finite-element-analysis (FEA), the Von Mises stress for the proposed topology in different rotational speeds shows its capability in handling mechanical stresses and the experimental results validate the characteristics of the proposed topology.