开关逻辑与旋转磁场

Switching Logic and Rotating Magnetic Field

变频器六个开关的通断状态与电动机旋转磁场的空间位置有一一对应的关系。这个关系是直接转矩控制和新型SPWM法的基础。求导这个关系要应用离散条件下的空间矢量积分。本文用基本图形阐明这种积分法的意义。

There exists one-to-one correspondence between the states of six switches in a cycloconverter and the position of rotating magnetic field in a induced motor. The relation is a theoretical foundation of direct torque control and new SPWN method, and can be deduced by the space vector integral under discrete conditions. Some basic graghs and figures are given to illustrate the integral.