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STUDY ON EFFICIENCY DETERIORATION DUE TO MAGNETIC SATURATION AND EFFICIENCY IMPROVEMENT OF RELUCTANCE MOTOR

磁饱和引起的效率下降及磁阻电机效率提高的研究

基本信息

批准号：
14550261
负责人：
NOGUCHI Toshihiko
金额：
$ 2.3万
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 (C)
财政年份：
2002
资助国家：
日本
起止时间：
2002 至 2003
项目状态：
已结题

项目摘要

During the financial support by this research project, grant-in-aid for scientific research, efficiency deterioration due to magnetic saturation and its improvement strategy of a synchronous reluctance motor are studied and the following results were obtained :(1)Stator winding resistance, d-axis inductance and q-axis inductance were accurately measured with a 1-kW synchronous reluctance motor, and it was confirmed that the both inductances can approximately be expressed as logarithmic functions with respect to each axis current.(2)Operation algorithm to maximize the efficiency of the motor was discussed for both cases with only copper loss and with copper and iron losses, using the above magnetic saturation mathematical model. The optimum magnetizing current characteristic was mathematically derived as a function of a torque current. The feasibility study was done through computer analysis by using parameter data measured the above tests.(3)An experimental system was set up with 2 syn … More chronous reluctance motors with identical ratings. Also, a fully digital controller was set up by using a standard computer, A/D and D/A converter boards real-time OS(RT-Linux) and controlled simultaneously the test machine and the load machine.(4)Experimental comparison has been conducted to evaluate feasibility of the proposed method, compared the proposed method with two conventional methods. As a result, motor efficiency was improved by 6.4 points, compared the proposed method with the constant magnetizing current method. Also, compared with the conventional maximum-efficiency operation method, i.e.id=iq, the proposed method surpasses the conventional method with 5.4 point efficiency improvement.(5)The true maximum-efficiency operating points were experimentally searched by changing the magnetizing current under constant speed and constant load conditions. The sought operating points were confirmed to be slightly less than the theoretically derived operating points to achieve the maximum efficiency, while both of the operating characteristic curves are quite similar non-linear functions of the torque current. This fact proved that the proposed magnetizing current condition was effective to improve the motor efficiency further. Less

本课题在科研资助期间，对同步磁阻电机磁饱和导致的效率下降及其改进策略进行了研究，得到了以下结果：(1)在1 kw同步磁阻电机上精确测量了定子绕组电阻、d轴电感和q轴电感；并证实了两种电感都可以近似地表示为对各轴电流的对数函数。(2)利用上述磁饱和数学模型，讨论了仅铜损耗和铜铁损耗两种情况下电机效率最大化的运行算法。用数学方法推导出最佳磁化电流特性与转矩电流的函数关系。利用上述试验测得的参数数据，通过计算机分析进行了可行性研究。(3)用2台同步磁阻电动机建立了相同额定值的同步磁阻电动机实验系统。采用标准计算机和实时操作系统（RT-Linux）的a /D和D/ a转换板建立全数字控制器，同时控制试验机和负载机。(4)通过实验对比，评价了所提方法的可行性，并将所提方法与两种常规方法进行了比较。与恒磁流法相比，电机效率提高了6.4个点。与常规的最高效率操作方法（即id=iq）相比，该方法的效率提高了5.4个点。(5)在恒速恒载条件下，通过改变磁化电流，实验寻找真正的最高效率工作点。为获得最大效率，所求工作点略小于理论推导工作点，两者的工作特性曲线是非常相似的转矩电流非线性函数。这证明了所提出的磁化电流条件对进一步提高电机效率是有效的。少