DEVELOPMENT OF INTERIOR PERMANENT MAGNET LINEAR SYNCHRONOUS GENERATOR THAT CAN CONVERT FROM WAVE POWER WITH HIGH EFFICIENCY.

本研究的目的是开发直线发电机，以实现高效的波激发电系统，而不需要像传统系统那样的低效率的空气变换设备。由于旋转发电机具有高速运转时效率高的特点，采用慢速往复运动驱动，造成系统的复杂性和昂贵，干扰了波浪发电系统的实际使用，本研究考察了各种特性，以开发结构最有效的直线发电机。研究了PM型直线同步发电机(PM-LSG)、混合型直线步进发电机(HB-LSTG)和高密度直线步进发电机(HD-LSTG)。在波浪发电中，对直线发电机进行防水造型是必不可少的。即使在PM-LSG的间隙长度为1 mm或更长的情况下，也能获得足够的感应电压。LSTG类型不能充分显示性能。此外，还阐明了在24 mm左右的极距处存在最大效率的最佳点。粗略估计可从波中提取的电能约为1kW/m。如果发电机是多层结构，则有可能以高速率收集7kW/m的波能。埋藏式结构的PM-LSG在相同磁体的量下，从表面安装的PM-LSG获得约10%的高功率。由于发电机在埋藏式结构中具有反凸极特性，利用变流器对电流矢量进行最优调节，可以进一步提高发电机的输出功率和效率。

The aim of this research is development of the linear generator to achieve a highly effective wave activated power generation system, which doesn't need low efficiency air conversion equipment such as conventional system. The system complexity and expensiveness to disturb the practical use of the wave power generation system is caused because the rotation generator that has the characteristic that becomes high efficiency at high speed operation is driven by the slow reciprocated motion.In this research, various characteristics were examined to develop the linear generator that has the most effective structure. PM type linear synchronous generator (PM-LSG), hybrid type linear stepping generator (HB-LSTG), and high density type linear stepping generator (HD-LSTG) were examined. It is necessary to give the waterproof molding in the linear generator for the wave power generation. An enough induced voltage is obtained even by the gap length of 1mm or more in the PM-LSG. The LSTG type cannot show the performance enough. Moreover, it was clarified that there is optimum point of the maximum efficiency in the pole pitch about 24mm. Electrical energy that can be taken out of the wave is estimated roughly with about 1kW/m. If the generator is made multilayered structure, it has been understood that there is a possibility that the wave energy of 7kW/m can be collected at the high rate.The buried structure PM-LSG became about 10% high power from the surface mounted PM-LSG in the amount of the same magnet. Because the generator has reverse-saliency in the buried structure, the output and the efficiency of the generator are thought to be ameliorable further by the optimal current vector regulation with the converter.