ANALYSIS OF LCI FED MULTI-PHASE SYNCHRONOUS MOTOR DRIVE

Abstract

The use of AC machinery_- in adjustable speed drive systems is growing rapidly. A typical drive system for a high-power application consists of a LCI drive and a synchronous machine. This report explores the . basic 'configuration and operation of the LCI drive system for a synchronous machine. This is based on literature written on the subject. A six-phase synchronous machine is used in the drive system as it has many advantages over a conventional three-phase, machine. In applications where the machine power is less than 10,000 Hp, an induction machine drive or a synchronous machine drive may be used. An efficiency analysis is made to determine the best efficiency performance of a LCI drive system for a synchronous machine versus a PWM drive system for an induction machine. Efficiency and cost data are gathered from real applications and the result,is tabulated. The design ratings- of the basic components of the drive system are also presented and finally_ -simulated results of the complete drive system are presented.