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2024
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12
Short-Term High-Overload Electromagnetic-Thermal Study of Permanent-Magnet Synchronous Motors
With the advancement of all-electric technologies, electric actuators are now widely used in fields such as aerospace and military applications.
With the advancement of all-electric technologies, electric actuators have been widely adopted in fields such as aerospace and military applications. Actuator motor systems are required to deliver high power density, rapid dynamic response, and exceptional reliability. Among these, permanent-magnet synchronous motors stand out due to their simple structure, high torque density, high power density, and superior efficiency—making them a popular choice for actuator servo systems. High-power-density motors typically refer to two main categories: high-speed, high-power-density motors and high-torque, high-power-density motors. For actuator systems, however, the focus is primarily on high-torque-density motors, which can meet the demanding dynamic response requirements during frequent acceleration processes. Both domestically and internationally, extensive research has been conducted on high-torque-density motors, resulting in a variety of innovative designs, including high-temperature superconducting motors, slotless cylindrical linear motors, transverse-flux motors, and switched-reluctance motors. Although these advanced motor designs boast impressive power densities, their technological development remains relatively immature, and their reliability still faces challenges. Therefore, this paper predominantly employs a surface-mounted permanent-magnet synchronous motor with a rotating design. Meanwhile, short-time high-overload motors are capable of delivering momentary, substantial overloads while maintaining constant speed, enabling actuators to execute predefined motion sequences efficiently. In recent years, research on short-time high-overload motors has gained significant momentum, with notable contributions from institutions like Harbin Institute of Technology and Tianjin University in China. Internationally, there has also been growing interest in studying the thermal characteristics of motors designed for short-term, periodic operation.
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