Characteristics Analysis of Short Flux-path 4/3 SRM

Abstract

Abstract – This paper presents a design and characteristics analysis of novel 2-phase 4/3 switched reluctance motor (SRM) with short flux path for an air-blower application. The desired air-blower is unidirectional application, and requires a wide positive torque region without torque dead-zone. In order to get a wide positive torque region without torque dead-zone during phase commutation, asymmetric inductance characteristic with non-uniform air-gap is considered. The proposed motor could be started at any rotor position with high efficiency drive. The proposed 2-phase 4/3 SRM is verified by finite element method analysis. Keywords: Switched reluctance m otor,Short magnetic flux -path , Twophase4/3poleSRM 1. Introduction Recently, high speed drives are much interested in the industrial applications to reduce the system size and to increase the drive efficiency. Especially, blowers, compressors, pump and spindle drives are suitable for the high speed motor drives, and the demand for the high speed motor system is much increased according to the industrial market. Some types of electric motor such as DC, permanent magnet and reluctance motor have been researched. SRM has simple structure and inherent mechanical strength without rotor winding and permanent magnet. These mechanical structures are suitable for harsh environments and high temperature and high speed applications