新型动圈式永磁直线电机样机设计及试验

Prototype Design and Experiment of Novel Moving Coil Permanent Magnet Linear Motor

针对内燃-直线发电集成动力系统对高发电效率、低推力波动、低运动质量直线电机的应用需求,提出了一种新型动圈式永磁直线电机的技术方案,分析了电机的结构特点及工作原理。对电机推力特性、推力密度和发电效率进行了分析及优化,并研制了一台最大推力为4 kN的样机。测试结果表明:该样机25Hz正弦往复运动的发电效率可达95.2%,推力密度为463 kN/m3,且行程范围内无需换向、无明显推力波动,达到了预期的设计要求。

To achieve the required high generating efficiency, low moving mass, and high thrust linearity, a novel moving coil PM linear motor was developed for Internal Combustion Linear Generator （ICLG）. The thrust force, thrust density and generating effieieney of the motor were predicted and optimized with FEM method. A 4.1 kN prototype was manufactured to verify the design method. The experimental results indicated that the thrust fluctuation of the machine was unconspicuous, and no commutation was required during the stroke range. The thrust density of 463 kN/m^3 was implemented. Furthermore, the efficiency of 95.2% was obtained under the test condition of 25 Hz sinusoidal reciprocating motion, which meets the requirements of the ICLG application.