| 摘要 |
A method of determining the direction of a 3 phase AC motor, where the AC motor is controlled by a control circuit 2 outputting six switching element control lines to a motor inverter circuit 1. The six lines represent an upper and lower line for each of the three phases U,V,W, and three pairs of signals are fed to sign discriminator circuits 3 and the signals therefrom are fed to a circuit which generates a direction output signal at output 7. |
