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、高效永磁体等的发展，使得小型化、超高速化、高性能的电力拖动系统成为可能。这种驱动器有望用于各种应用，如热电联产系统，电动汽车和压缩机，其中需要小尺寸，轻重量和高效率。本研究旨在建立超高速电动发电机系统之最佳化设计。主要研究成果如下：（1）设计并搭建了一套5 kW、30，000 rpm超高速驱动系统样机。该系统由DSP TMS 320 C32控制部分、矩阵变换器和PWM控制电压源逆变器供电部分和超高速永磁电机组成。油循环系统用于轴承和电机的冷却。(2)As电动机尺寸太小，无法安装转子位置编码器，则需要无位置或速度传感器的控制。因此，我们引入“改进的V/f恒定控制”。此外，在DSP程序中还安装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）采用有限元法对电机的涡流特性进行了分析，并对电机的设计参数进行了评估。定子齿宽对涡流的影响较大。Inconel-718合金的功率损耗和感应涡流随着齿宽的增加而减小。这些分析结果反映到电机设计中。（4）建立了用于评价和增强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：DSP系统的“C模型”、矩阵变换器和逆变器-变换器系统的“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.