400 Commonwealth Drive, Warrendale, PA 15096-0001 U.S.A. Tel: (724) 776-4841 Fax: (724) 776-5760 Web: www.sae.org 2005-01-0276 Development of the IMA Motor for the V6 Hybrid Midsize Sedan Akira Kabasawa and Kazunari Takahashi Honda R&D Co., Ltd. Reprinted From: Advanced Hybrid Vehicle Powertrains 2005 (SP-1973) 2005 SAE World Congress Detroit, Michigan April 11-14, 2005 SAE TECHNICAL PAPER SERIESDownloaded from SAE International by University of Edinburgh, Sunday, August 26, 2018The Engineering Meetings Board has approved this paper for publication. It has successfully completed SAE’s peer review process under the supervision of the session organizer. This process requires a minimum of three (3) reviews by industry experts. All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted, in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise,without the prior written permission of SAE. For permission and licensing requests contact: SAE Permissions 400 Commonwealth DriveWarrendale, PA 15096-0001-USAEmail: [email protected]: 724-772-4028Fax: 724-772-4891 For multiple print copies contact: SAE Customer ServiceTel: 877-606-7323 (inside USA and Canada)Tel: 724-776-4970 (outside USA)Fax: 724-776-1615Email: Customer [email protected] ISSN 0148-7191Copyright © 2005 SAE International 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 pap er if it is publishe d in SAE Transactions. Persons wishing to submit papers to be considered for presentation or publication by SAE should send themanuscript or a 300 word abstract to Secretary, Engineering Meetings Board, SAE. Printed in USADownloaded from SAE International by University of Edinburgh, Sunday, August 26, 20182005-01-0276 Development of the IMA Motor for the V6 Hybrid Midsize Sedan Akira Kabasawa and Kazunari Takahashi Honda R&D Co., Ltd. Copyright © 2005 SAE International ABSTRACT The Integrated Motor Assist (IMA) Hybrid Electric Vehicle (HEV) technology used in Civic Hybrid or Insight is developed originally by Honda, and is mounted in a V6 Accord with the aim of enhancing fuel economy of a mid-size passenger car. The development goal was to realize a mid-size passenger car that provides acceleration performance superior to a V6 Accord and the fuel economy of a compac t class vehicle. Various means are employed to achieve high torque and high efficiency simultaneously, including an Interior Permanent Magnet (IPM) type rotor, low-loss electrical steel sheets as the stator material, and high maximum energy product magnets. These technologies increase the maximum power of the newly developed motor by approximately 20%, the maximum torque by 26% and motor efficiency over all ranges by approximately 1% to 3% compared to the current Civic Hybrid motor. Consequently, the maximum motor power of 14 kW and maximum motor torque of 136 Nm are achieved. In addition,direct couplers for high voltage connections and simplified structure of distribution parts are employed to increase production efficiency. INTRODUCTION Due to heightened awareness toward the global environment, demands are increasing to reduce automotive fuel consumption and to produce cleaner emissions. As a means of meeting these demands, Honda has applied its original IMA system hybrid technology first to the ultra low fuel consumption vehicle Insight, and then to the compact hybrid passenger car Civic Hybrid. Recently an IMA system has been developed to adapt to mid-size passenger cars based on a V6 3.0-liter i-VTEC engine and 5-speed automatic transmission. This paper describes the details of a motor applied to this system. DEVELOPMENT GOALS The new IMA motor was developed with the following goals in order to simultaneousl