Consideration in the Electromagnetic Design of Brushless DC Motor for Flight Control
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摘要: 飞行控制中机电作动系统的发展是全电飞机的重要技术之一,而无刷直流电动机是其中的关键部件.采用钐钴永磁材料可以明显地减轻电机的质量和提高效率,该电机能在低惯量下输出高转矩,具有良好的快速响应能力.但电机体积主要受定子损耗引起的发热和温升的限制,与永磁材料的磁能积无关.另外,脉宽调制逆变器电源将使电机的铁损耗大大增加.根据逆变器电源的特点,结合电机的技术指标和对功率/质量、峰值转矩/转子惯量等要求,提出了该电机设计时应考虑的主要电磁因素.Abstract: Development of the electromechanical actuation system for use in primary flight controls is one of the major technologies in the path to an all-electric airplane. Brushless DC motor(BLDCM) is the key in this system. In BLDCM designs, the use of samarium cobalt magnet can significantly reduce motor mass and increase efficiency. Such motor output of a high torque has a low rotor inertia, and quick responsibility.The machine volume is mainly limited by heating and a rise in temperature which results from the losses in the stator, it is independent of magnetic energy of PM materials. On the other hand, the use of pulse width modulation(PWM) inverter for BLDCM leads to a high increase of core loss. This paper presents the major electromagnetic factors of BLDCM, taking into account PWM inverter source, specification, power/mass and peak torque/rotor inertia etc.
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