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Technical Paper

Development of Switched Reluctance Motor for EV Traction System

Switched Reluctance Motor (SRM) mainly has two advantageous characteristics such as no magnet and simple construction. These characteristics contribute lower cost and higher reliability compared with other motor systems such as brushless permanent magnet motors or induction motors. However, acoustic noise and output torque ripple should be improved when the SRM is applied to a traction system for passenger electric vehicle since these characteristics directly affect vehicle quietness and drivability. In this paper, we describe a system configuration of the SRM traction system for passenger electric vehicle. The SRM traction system includes an electric motor, transmission gears and power inverter module. Then, an approach to improve acoustic noise and output torque ripple is introduced. Generation mechanisms of acoustic noise and output torque ripple are analyzed.
Technical Paper

Development of VFT Part 2

Exhaust emission regulation has become stricter year by year because of the global movements of environment protection. In consequence, turbocharger application to diesel engines became indispensable. Especially a variable geometry turbocharger (VGT) is perceived as the essential item. Of late years, the diesel engine has a trend of higher exhaust temperature to increase specific output. At the same time, needs of the turbocharger application to the gasoline engine has been rising again in order to reduce the size. In spite of this trend of the emission temperature increment, VGT of the variable nozzle vane type which is commonly available in the current market has problems of high temperature resistance due to its complex structure. AISIN SEIKI has developed a variable flow turbocharger (VFT), which is able to resolve those problems.
Technical Paper

Development of Permanent Magnet Assisted Synchronous Reluctance Motor for Electric Vehicles

We have developed permanent magnet assisted synchronous reluctance motor (SynR motor) using inexpensive permanent magnet (ferrite magnet) for a drive motor of an electric vehicle (EV) or a hybrid electric vehicle (HEV). The objective of this development is to reduce the motor cost by utilizing reluctance torque without using expensive magnet (NdFeB magnet). We confirmed the developed motor is applicable by the test result when the motor performance is adapted to the system specification with high speed. Such motor design and evaluation result will be introduced hereinafter. Further, in this paper, we also introduced the comparison with a switched reluctance motor (SR motor), which we have been developing separately.