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Reseach on an electro-mechanical energy conversion system with small size and 95% efficiency

研究%20on%20an%20机电%20energy%20conversion%20system%20with%20small%20size%20and%2095%%20efficiency

基本信息

批准号：
07555406
负责人：
TAKAHASHI Isao
金额：
$ 1.28万
依托单位：
Nagaoka University of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1995
资助国家：
日本
起止时间：
1995 至 1996
项目状态：
已结题

项目摘要

The aims of the research are to develope a high efficiency over 97%, small size of 10kW/lit. and high speed of 40000rpm motor/generator, and its efficiency of 97.5% current type power converter.The high efficiency motor/generator is realized by using coreless structure with no-ironloss, high frequency of 1.5kHz which can reduce the number of turns of the winding and He gass to decrease windage-loss. To maintain the gap flux dencity, the neodymium magnet which has high energy production and carbon FRP bands which sustain the magnets, and high speed ceramic bearings must be employed. The coreless structure makes large eddy current loss in the windings and, by using litz wires, it can reduce to under 10%. The motor/generator obtained experimentally is following :6kW 30000rpm 140phi*64 2.8kg efficiency 97.0% (at 5kW output) The planed speed 40000rpm can not be accomplished by rotor distruction.The high efficiency current type inverter/converter which drives its motor/generator is also developed. It is combined a current control chopper and a three phase frequecy changer both of them have high efficiency at high frequency area. The losses in switching devices are divided into two ; onvoltage drop losses and switching losses at on and off times. The former can be decreased by using direct drive method of a transistor and the latter by using current control of the base current or lossless snubber circuits. These techniques are newly developed in this research. 99.2% of chopper efficiency and 98.9% of efficiency of frequecy changer are obtained. As a result, total efficiency of 95.1% is acheived which is slightly larger than planned one.

本课题的研究目标是研制一种效率大于97%、体积小、功率为10 kW/升、转速为40000 rpm的高效率电动机/发电机，其效率为97.5%的电流型功率变换器，采用无铁心结构，无铁损，1.5kHz的高频，可减少绕组匝数和氦气，降低风损。为了保持差距磁通密度，必须采用具有高能量产生的钕磁体和支撑磁体的碳玻璃钢带，以及高速陶瓷轴承。无铁心结构使绕组中的涡流损耗很大，采用绞合线可将涡流损耗降低到10%以下。实验得到的电动机/发电机为：6 kW 30000 rpm 140 phi * 642.8kg效率97.0%（5 kW输出时）设计转速40000 rpm不能通过转子破坏实现，并研制了驱动电动机/发电机的高效电流型逆变器/变换器。它由电流控制斩波器和三相变频器组成，两者在高频区都有很高的效率。开关器件中的损耗分为两种：导通压降损耗和导通和关断时的开关损耗。前者可以通过晶体管的直接驱动方法来减小，后者可以通过基极电流的电流控制或无损缓冲电路来减小。这些技术都是本研究中新发展起来的。斩波器效率达99.2%，变频器效率达98.9%。结果表明，总效率达到95.1%，略高于设计值。