Abstract
Multi-phase machines (more than three-phase) are rigorously being investigated for various high power applications due to their increased power to weight ratio, increased frequency and reduced magnitude of torque pulsation, and fault tolerant characteristics. Fault analysis of a system is extremely important, not only to understand its operating characteristic, but it is also required prior to the design of suitable control/protective scheme. Therefore, the aim of this paper is not to devise a new mathematical model and control algorithm, but to investigate the behavior of six-phase synchronous motor (SPSM) under fault conditions caused by open circuit (OC) and short circuit (SC) at its input terminals as that has not been reported so far. Some key analytical results have been experimentally verified.
Highlights
Multi-phase motor drives have been extensively analyzed in last two decades due to their advantages over their three-phase counterparts
Mathematical modeling of a six-phase synchronous machine was reported by Schiferl and Ong[5], wherein the mutual coupling between two sets of three-phase windings was taken into consideration
A unified and simplified approach was adopted for digital simulation for different cases of open circuit (OC) at input terminals of six-phase synchronous motor (SPSM) using dq0 variables
Summary
Multi-phase motor drives have been extensively analyzed in last two decades due to their advantages over their three-phase counterparts. Authors examined the machine operation for power transfer during transformer as well as motor mode at steady-state. A detailed modeling and analysis of SPSM during steady-state under different operating conditions has been reported[9]. Symmetrical component method is commonly used for analysis of unbalanced operation of electric machines under fault condition. This method can be used in the steady-state analysis for sinusoidal excitation, it loses its usefulness due to lack of interaction between the lost phases and remaining machine windings which drastically alters the dynamic behavior of the machine[1]. This paper deals with a detailed SC analysis of SPSM by developing an accurate computer simulation program for both asymmetrical and symmetrical modes
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