Development of Ultra High Speed Generator ; Motor and Drive System

近年来，电力电子技术、低损耗铁芯材料和高效永磁体等技术的发展，使得实现小体积、超高速、高性能的电力传动系统成为可能。这种驱动有望在热电联产、电动汽车、压缩机等要求体积小、重量轻、效率高的各种应用中得到应用。本研究的目的是建立超高速电机-发电机系统的最优设计。研究成果总结如下：(1)设计并搭建了5kW、30000rpm的原型机超高速驱动系统。该系统由三部分组成：(1)以数字信号处理器(DSP)为核心的控制部分；(2)采用矩阵转换器和脉宽调制(PWM)控制的电压型逆变器的电源部分；(3)超高速永磁电机。电机的轴轴承和冷却系统采用油循环系统。(2)由于电机尺寸太小，不能安装转子位置编码器，因此需要无位置或速度传感器控制。因此，我们引入了“改进的V/f恒定控制”。此外，在DSP程序中设置了避免系统不稳定的稳定程序和最小化定子电流的高效控制回路。(3)采用有限元方法对电机进行涡流分析，对电机设计参数进行评估。定子齿宽对涡流是有效的。Inconel-718的功率损耗和感应涡流随齿宽的增加而减小。(4)建立了用于评价和改进整个驱动系统的计算机仿真模型，该模型由三个子系统组成，分别表示为数字信号处理器系统的“C模型”、矩阵转换器和逆变器系统的“模拟元件”和电机的“等效电路模型”。

Resent developments of power electronics technology, low-loss iron core materials and highly efficient permanent magnet, etc have made it possible to realize a small size, ultra-high speed, high performance electrical drive system. Such drive is expected for various kinds of applications such as co-generation system, electrical vehicle and compressor, in which small size, light weight and high efficiency are required. The aim of this research is to establish optimal design for ultra-high speed motor-generator system. Research results are summarized as follow ;(1)We designed and built a proto-type 5kW, 30,000rpm ultra-high speed drive system. The system consists of (i)a control part which uses DSP TMS320C32, (ii)a power supply part using a matrix converter and a PWM controlled voltage source inverter and (iii)a ultra high speed PM motor. An oil circulation system is used for the shaft bearing and the cooling of the motor.(2)As the motor size is too small to mount a rotor position encoder, position or speed sensor-less control is necessary. Therefore, we introduce "improved V/f constant control". In addition, stabilization routine to avoid system instability and high efficiency control loop to minimize stator currents is installed in the DSP program,.(3)The eddy current analyses were examined to evaluate the motor design parameters by using FEM. The teeth width of the stator is effective for the eddy current. The power loss and induced eddy current in the inconel-718 are decreased according to increase of the teeth width. These analytical results were reflected to the motor design.(4)The computer simulation model was created to evaluate and enhance the total drive system, which consists of three parts ofsubsystem such are represented "C model" for DSP system, "Analog component" for matrix converter and inverter-converter system and "Equivalent Circuit Model" for motor.