Special Session
New Motors -Innovation of Mature Devices-

New Motors

The Special Session is scheduled for the first day of the JMAG Users Conference 2010 after receiving rave reviews from those who participated. The theme for the Special Session this year is “New Motors.” Motor developments based on new concepts are being actively pursued following stricter demands for higher performance and a much wider range of applications for motors that are continually advancing. Ingenuity has expanded to new avenues of innovation such as slot combinations, materials, and drive methods. This year’s JMAG Users Conference will focus on this type of ingenuity. Each of the presenters asked to participate is involved in their own unique motor development. In addition to their groundbreaking ideas, each presentation will shed light on the methodology that brought them into existence.


Novel Permanent Magnet Brushless Machines and Applications
Professor. Zi-Qiang Zhu, University of Sheffield, UK

The first to present this year is Professor Zi-Qiang Zhu from the University of Sheffield. Professor Zhu is known for his ongoing and enthusiastic research in the field of motor design and he is currently leading PM motor development in the world based on new operating principles. Professor Zhu’s research department at the University of Sheffield doesn’t simply provide design methodology, but consistent and thoroughly documented evidence of their research from actual experimentation performed on prototypes. In this presentation, Professor Zhu will explain in simple terms part of the advanced theory which is the source of new ideas while discussing how simulation technology is being utilized.

Variable-Magnetic-Flux Motors for Creating New Generation Motor Drives
Dr. Kazuto Sakai, Associate Professor, Department of Electrical, Electronic and Computer Engineering Faculty of Science and Engineering, Toyo University

Following Professor Zhu, Professor Kazuto Sakai will present his research in new types of variable magnetic flux motors. Energy saving of electrical appliances and electric vehicles (EV) require the reduction of power consumption of motors. Professor Sakai’s presentation takes an ingenious look at a new type of motor for the future that focuses on memory motors and variable flux motors which directly vary the magnetic characteristics of permanent magnets to overcome the challenges of reducing the total power consumption of variable speed drive permanent magnet motors used to achieve higher efficiency.

Study of Flux-Intensifying Interior Permanent Magnet Synchronous Machine
Mr. Yuichi Shibukawa, Nissan Research Center, EV system Laboratory, NISSAN MOTOR CO., LTD.

Mr. Shibukawa from Nissan presents a flux-intensifying interior permanent magnet synchronous machine. IPM motors with conventional positive salient structures are known to have trouble obtaining sufficient torque while sustaining their positive saliency. The structure of the motor introduced in this presentation resolves this problem and improves the self-sensing control in very low speed regions. Mr. Shibukawa will also discuss the results of his testing compared to conventional motors.

Studies on Less Rare-Earth and High Power Density Hybird Excitation Motors
Dr. Takashi Kosaka, Associate Professor, Graduate School of Engineering, Omohi College, Nagoya Institute of Technology

Mr. Kosaka from the Nagoya Institute of Technology presents the results of his high power density hybrid excitation motor. A high power density hybrid excitation motor is a motor which utilizes both the magnetic force of the magnets and the efficient 3-dimensional magnetic circuit. The number of rare-earth magnets can be reduced by half while still achieving the same output density when compared to the IPM motors installed in hybrid automobiles.

Furthermore, there validity for variable magnetic force and higher torque performance is indicated by the testing of the miniaturized prototype. Mr. Kosaka will deliver a fascinating presentation about countermeasures to resolving the problems of rare-earth resources expected so highly in recent years.

Innovation of Mature Devices

Although the sub-session, “Innovation of Mature Devices,” may seem to already be standardized, JMAG strives to facilitate further innovation by dissecting the development approach of motors, transformers, etc.

The optimal method to meet the needs of a world demanding environmental conservation is not by replacing mature devices with something new, but rather addressing ways to comprehensively improve the performance and development process by rethinking how they are viewed.

In 2007, Dr. Shigekazu Sakabe from Tabuchi Electric, Co., Ltd demonstrated this theme when he discussed the demands for electromagnetic field analysis and problems specific to transformers. In 2008, Dr. Kazumasa Ide from Hitachi discussed the long history of design and development of large rotating machines and the efforts to improve their performance using cutting edge simulation technology.

Last year, Prof. Thomas M. Jahns from the University of Wisconsin was followed by Mr. Toshiaki Idemitsu from the YASKAWA MOTOR CORPORATION, Mr. Akihede Takehara from the TOYOTA MOTOR CORPORATION, and Professor Katsumi Yamazaki from the Chiba Institute of Technology to clearly present their perspectives toward mature PM motors focusing on the rapid innovations of IPM motors as key components to energy conservation devices and whether this type of motor development is changing the world we live in today.

The evolution and innovation of mature motors, which has exceeded many people’s expectations, provides a solid stepping stone for the design and development of other mature devices.

In addition to the special session, the JMAG Users Conference 2010 is packed with user examples as well as introductions to new products and technology.

We look forward to seeing all of you there.

Takashi Yamada
Engineering and Technology Division
JSOL Corporation