Three-phase motor button interlock commutation circuit

The picture shows the button interlock commutation circuit of a three-phase motor. This circuit uses a composite button (that is, there is a pair of normally open contacts and a pair of normally closed contacts in one button, which act simultaneously when the button is pressed) to realize button interlocking connection. When the motor is running in the forward direction, pressing the STR button will immediately cause the KMF to lose power, stop the motor, and immediately enter reverse operation. vice versa. This not only ensures that the forward and reverse contactors KMF and KMR will not be energized at the same time, but also allows you to directly press the reverse button to start the reverse without pressing the stop button.