초고속 SPMSM 회전자용 CFRP슬리브의 열-기계적 설계 및 분석

This paper presents an integrated thermo-mechanical design methodology for a carbon fiber reinforced plastic sleeve for high-speed surface permanent magnet synchronous motor rotors. The proposed methodology is based on an analytical stress model that incorporates the orthotropic and thermal expansion properties of carbon fiber reinforced plastic. A designable region that prevents both magnet scattering and sleeve failure is derived over the entire operating temperature range of the motor. Applying this methodology to a 100 kW, 20,000 rpm motor, an optimal design was achieved with a sleeve thickness reduction of approximately 50% compared to a conventional Inconel sleeve. Furthermore, experimental results demonstrated that the carbon fiber reinforced plastic sleeve, unlike metallic counterparts, exhibits negligible increase in load torque at high rotational speeds, suggesting a potential for enhanced torque or efficiency. This study provides a systematic design framework that ensures both mechanical reliability and electromagnetic efficiency for high-speed motors, highlighting its academic and industrial significance.