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Study on Difference between Electrical Parameters of Induction Motor for Vector Control System and Ones for Calculation of Load Characteristics

矢量控制系统感应电动机电气参数与负载特性计算电气参数差异的研究

基本信息

批准号：
06650337
负责人：
MIKI Ichiro
金额：
$ 1.41万
依托单位：
Meiji University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1994
资助国家：
日本
起止时间：
1994 至 1995
项目状态：
已结题

项目摘要

In this study, a simple method (A method) based on the one described in standard of the Japanese electrotechnical committee was selected to obtain electrical circuit parameters for calculating load characteristics of an induction motor, and a new auto-tuning method (B method) that we developed for this study was used to obtain circuit parameters for vector control system. According to this auto-tuning method, accurate parameters for vector control system can be obtain under the similar operating condition to the vector controlled motor. As a result, two sets of circuit parameters of the tested induction motor were obtained. Using these parameters, load characteristics were calculated and the vector control system was constituted. Although instantaneous torque waveform of the motor is slightly distorted when the vector control system is constituted using the parameters obtained by the A method, the linearity between input and output torque is almost maintained. Therefore, it is found that circuit parameters obtained by the A method are valid for this vector control system and the error of parameters for the start up of the vector control can be tolerant to some extent. Load characteristics calculated using circuit parameters of the B method almost agree with experimental results within the rated output of the induction motor. In this case, the primary and secondary leakage reactance of the induction motor obtained by the B method are about 2.0 times ones obtained by the B method. This is the largest cause for the error between calculated and experimental results in the region above the rated output, and the difference of leakage reactance values is caused by the difference of operating condition of induction motor when circuit parameters are identified. Furthermore, as circuit parameters for vector control system are tuned without considering the core loss of the motor stator, this is also one of causes that extend the difference of leakage reactances.

在本研究中，采用基于日本电工委员会标准描述的简单方法（a法）获取感应电机负载特性计算电路参数，并采用我们为本研究开发的新的自整定方法（B法）获取矢量控制系统电路参数。根据这种自整定方法，可以在与矢量控制电机相似的工作条件下获得矢量控制系统的准确参数。结果得到了两组被测异步电动机的电路参数。利用这些参数计算了负载特性，构建了矢量控制系统。利用A法得到的参数构成矢量控制系统时，电机的瞬时转矩波形虽然有轻微畸变，但几乎保持了输入输出转矩之间的线性。由此可见，A法得到的电路参数对该矢量控制系统是有效的，矢量控制启动参数的误差在一定程度上是可以容忍的。在感应电动机额定输出范围内，用B法的电路参数计算的负载特性与实验结果基本吻合。在这种情况下，用B法得到的感应电动机的一次和二次漏抗大约是用B法得到的一次和二次漏抗的2.0倍。这是造成计算结果与实验结果在额定输出以上区域误差的最大原因，而漏抗值的差异是由于感应电机在识别电路参数时运行状态的差异造成的。此外，由于矢量控制系统的电路参数的调整没有考虑电机定子铁心损耗，这也是导致漏抗差异扩大的原因之一。