高速永磁发电机的设计与电磁性能分析

Design and Analysis of Electromagnetic Properties for High Speed PM Generator

由于结构简单、高效率和高功率密度,永磁转子成为高速电机的首选结构,然而转子的高速旋转和定子的高频供电,对高速永磁电机的电磁与机械设计提出了新的要求。该文在分析高速永磁电机设计特点的基础上,对一台60000r/min、75kW的高速永磁同步发电机进行了电磁与结构设计,基于场路耦合有限元法分析了高速永磁同步发电机的空载和负载特性,计算了负载运行时电机的电磁与机械损耗,并进行了电机的温升场分析。计算的结果表明,高速永磁发电机的设计合理,电机性能能够满足设计要求。

Due to simple structure, high efficiency and high power density, the permanent magnet （PM） rotor becomes the first candidate of rotor structure for high speed machines. However, the high rotating speed of the rotor and high frequency of the stator currents bring new requirements for the high speed PM machine design. In this paper, after analyzing the design features of high speed PM machine, the mechanical and electromagnetic design of a 60 000 r/min, 75 kW high speed PM generator was accomplished. Based on field-circuit coupled finite element method, the no load and full load characteristics of the high speed PM synchronous generator were analyzed. The electromagnetic and mechanical losses of the generator at rated load were calculated, and the temperature field distributions of the PM generator were analyzed. The simulation results show the reasonability of the high speed machine design. The performances of the high speed PM generator can meet the design requirement.