Study of High-Performance Vector Controls for AC Servo Motors Taking Core-Losses into Account

通过研究，取得了以下成果：1）建立了交流电机统一的数学模型，成功地将定子涡流损耗和磁滞损耗分别建模; 2）建立了感应电机和同步电机定子磁链的数学模型。结果表明，将定子磁链模型应用于统一模型，可以方便地得到感应电动机或同步电动机的具体模型; 3）上述二维正交坐标系下的结果可以推广到U、V、W三相坐标系下; 4）框图有助于全面理解。新建立了简单明了的交流电动机框图，它采用矢量信号而不是标量信号。提出了一种新的辨识方法，可以在涡流和磁滞损耗对应的统一数学模型上辨识等效铁损电阻。通过三台电机的实验验证了辨识方法的有效性。6）建立了考虑铁损的矢量控制方法，7）针对异步电动机，建立了一种考虑铁损的矢量控制最小损耗策略上述结果被应用到无位置传感器感应电动机驱动，特别是电动汽车和其有用性得到证实。

The following results are obtained through the study.1) A unified mathematical model for AC motors is newly established, which succeeds in modeling eddy current and hysteresis losses of stator separately and simultaneously.2) Mathematical models for stator flux of induction and synchronous motors are also established. It is shown that concrete models for induction or synchronous motor can be easily obtained by applying the stator flux models to the unified model.3) It is shown that the above results defined on two dimensional orthogonal coordinates can be extended to the U, V, W three phase coordinates.4) As well known, block diagrams are useful for overall comprehension. Simple and clear block diagrams of AC motors are newly established, which use vector signals rather than scalar signals. The block diagrams succeed in expressing the core loss phenomena caused by eddy current or/and hysteresis loss and have a high generality.5) A new identification method is established, which can identify equivalent core-loss resistances on the unified mathematical model corresponding to eddy current or/and hysteresis loss. The usefulness of the identification method is verified through experiments using three motors.6) A vector control method taking core-losses into account is established, which can be applied to synchronous motor as well as induction motor.7) A minimum loss strategy associated with vector control taking core-losses into account is established for induction motor.8) The above results are applied to sensorless induction motor drive especially for electric vehicle and its usefulness is confirmed.