Analysis and design of synchronous reluctance motor drive for low speed applications

Abstract

The Synchronous Reluctance Motor (SynRM) is an Alternating newlineCurrent (AC) machine and designed to operate exactly in synchronous speed. newlineFor this purpose, a three-phase stator coil and a rotor with an internal flux newlinebarrier are usually used. Choosing an electric motor for an application is a newlinedifficult choice given the constraints on efficiency, torque, weight, volume, newlineand speed. SynRM is considered an alternative to Induction Motor (IM) and newlinePermanent Magnet (PM) machines these days. It has much merit in terms of newlinetorque density, synchronous operation, dynamic response, wide speed range, newlineefficiency, and use of standard converter technologies when compared other newlineAC machines. As there is no PM, there is no demagnetization at a higher newlinetemperature SynRM is considered an economical replacement for PM newlinemachines. The loss of copper from the rotor is eliminated, which improves the newlineefficiency of the machine because there is no winding in the rotor. It is seen as newlinea viable option to IM due to its higher efficiency, easy to control, the ability to newlineoperate at a lower speed without forced cooling. This thesis explores the newlinepossibility of using the SynRM machine for low speed applications such as newlinedomestic, two- and three-wheeled electric vehicles. newlineThe objective of this thesis is to analyze, design and develop newlineSynRM with both internal and external rotor configuration for low speed newlineapplications. An external rotor configuration has certain advantages newlinecompared to the internal rotor, so the external rotor (Ex-R) is explored for newlineboth domestic and two-wheeler applications. In addition, the internal rotor newlineconfiguration is explored for the three-wheeler application to accommodate newlinethe existing mechanism. As a first step, the main motor dimensions such as newlinerotor diameter and axial length of both external and internal are identified newlinethrough an analytical method to achieve a higher saliency ratio. newline