Development of a High-Power Density Motor (First Report)
-Formulation and Verification of the Design Concept-

Naoki Itasaka･Michiharu Kawano･Hisayuki Kabashima･Kentaro Nomura･Kazunori Hirabayashi (MCF Electric Drive)

This study reports design and analysis results for the development of high power density motor.
The design concept aimed at achieving world-standard power density is presented, along with performance predictions based on electromagnetic and thermal analyses.
Furthermore, the effectiveness of simulations is validated by incorporating experimental evaluation results.

Development of a High-Power Density Motor (Second Report)
-Performance Verification via Analysis and Prototype Testing-

Hisayuki Kabashima･Naoki Itasaka･Michiharu Kawano･Kentaro Nomura･Kazunori Hirabayashi (MCF Electric Drive)

This paper reports the performance evaluation of high power density motor prototype based on design and analysis results. The testing methods and measurement environment are described, and evaluation results for performance characteristics, efficiency, and temperature distribution are presented.
Furthermore, issues observed during testing and the actual motor behavior are discussed, verifying consistency with the analytical results.

Development of a High-Power Density Motor (Third Report)
-Cooling Performance Verification and Design Optimization-

Michiharu Kawano･Hisayuki Kabashima･Naoki Itasaka･Kentaro Nomura･Kazunori Hirabayashi (MCF Electric Drive)

This paper presents a discussion on the evaluation results of the prototype motor and further design optimization. Specifically, cooling performance is verified through a comparison of oil flow visualization results and analysis outcomes, followed by the identification of issues. Based on these insights, design improvements are proposed, and the outlook for realizing next-generation high power density motors is presented.

Development of Rotary-Fin Structure of Air-Cooled In-Wheel Motors for Small EVs

Tetsuya Suto･Akeshi Takahashi (Astemo)･Makoto Ito (Hitachi)･Hideaki Goto (Astemo)

We are developing an air-cooled outer-rotor direct-drive system for small cars and motorcycles with strict cost constraints. This drive system dissipates heat of motor losses from the rotary fins installed on the side of the rotor housing, achieving a continuous output of 5.5kW, which is top-class in air cooling. In this presentation, we report on the concept of this cooling structure and the test results.