400 Commonwealth Drive, Warrendale, PA 15096-0001 U.S.A. Tel: (724) 776-4841 Fax: (724) 776-5760 SAE TECHNICAL PAPER SERIES 2000-01-3063 Effect of Motor Short Circuit on EV and HEV Traction Systems Z. Rahman, M. Ehsani and K. L. Butler Texas A&M University Reprinted From: Future Engines (SP-1559) 2000 Future Transportation Technology Conference Costa Mesa, California August 21-23 , 2000Downloaded from SAE International by Univ of California Berkeley, Thursday, August 02, 2018The appearance of this ISSN code at the bottom of this page indicates SAE’s consent that copies of the paper may be made for personal or internal use of specific clients. This consent is given on the condition, however, that the copier pay a $7.00 per article copy fee through the Copyright Clearance Center, Inc. Operations Center, 222 Rosewood Drive, Danvers, MA 01923 for copying beyond that permitted by Sec- tions 107 or 108 of the U.S. Copyright Law. This consent does not extend to other kinds of copying such as copying for general distribution, for advertising or promotional purposes, for creating new collective works, or for resale. SAE routinely stocks printed papers for a period of three years following date of publication. Direct your orders to SAE Customer Sales and Satisfaction Department. Quantity reprint rates can be obtained from the Customer Sales and Satisfaction Department. To request permission to reprint a technical paper or permission to use copyrighted SAE publications in other works, contact the SAE Publications Group. No part of this publication may be reproduced in any form, in an electronic retrieval system or otherwise, without the prior wri tten permission of the publisher. ISSN 0148-7191 Copyright © 2000 Society of Automotive Engineers, Inc. Positions and opinions advanced in this paper are those of the author(s) and not necessarily those of SAE. The author is solely responsible for the content of the paper. A process is available by which discussions will be printed with the paper if it is pu blished in SAE Transactions. For permission to publish this paper in full or in part, contact the SAE Publications Group. Persons wishing to submit papers to be considered for presentation or publication through SAE should send the manuscript or a 30 0 word abstract of a proposed manuscript to: Secretary, Engineering Meetings Board, SAE. Printed in USAAll SAE papers, standards, and selected books are abstracted and indexed in the Global Mobility DatabaseDownloaded from SAE International by Univ of California Berkeley, Thursday, August 02, 20182000-01-3063 Effect of Motor Short Circuit on EV and HEV Traction Systems Z. Rahman, M. Ehsani and K. L. Butler Texas A&M University Copyright © 2000 Society of Automotive Engineers, Inc. ABSTRACT Short circuit incidents on traction motors can cause ‘wheel-locking’ on the vehicle, and may have an adverse impact on vehicle stability. This paper investigates the necessity of fault-tolerant motors for EV and HEV traction applications. Reaction of resulting fault torques differ along with electric motor types and fault variety. The paper analyzes the short-circuit behavior of three basic motor types: permanent magnet, induction and switched reluctance motor. The analysis is based on the transient simulation of the three most common inverter short-circuit cases and their effect on vehicle stability. INTRODUCTION Passenger safety is undoubtedly the most important issue for automobile industries. Despite the presence of highly flammable fuels, internal combustion engine (ICE) based vehicles have earned the public acceptance as a safe transportation medium. Hence, any selection of electric propulsion for EV and HEV needs to be done by addressing the safety issue properly. Electric motor drives are susceptible to inverter faults. In EV and HEV architectures, where electric motor produces the entire or partial propulsion power, a fault in the drive circuit can cause unwanted asymmetrical distribution of tracti