基于任意参考坐标系的异步电动机功率分析

Analysis of the Powers in Asynchronous Motors Based on Arbitrary Reference Frame

根据机电能量转换原理和坐标变换理论,分析了异步电动机在任意参考坐标系中的功率平衡关系。推导了功率表达式,阐明了参考坐标系功率的物理意义和特性．分析表明,坐标变换不影响功率平衡关系,参考坐标系功率是由定子传递到转子的功率和转子从定子吸收的功率构成的,其值恒等于零；同时也证明坐标变换使变压器电动势和运动电动势的作用实现了解耦,而转子磁场定向使转子变压嚣电动势和运动电动势实现了解耦．

According to the principle of electromechanical energy conversion and reference frame transformation theory, the power balance of an asynchronous motor in arbitrary reference frame is analyzed and the power expressions are derived. The physical meaning and characteristic of reference frame power are illustrated in detail. The analysis shows that the reference frame transformation doesn＇t affect the power balance and the reference frame power, which is the sum of the powers converted from stator to rotor and absorbed by rotor, is zero constantly. In the meantime, it is proved that the functions of transformer electromotive force and motional electromotive force are decoupled by reference frame transformation. The transformer electromotive force and motional electromotive force in rotor are decoupled by rotor field orientation.