Energy-saving three-phase asynchronous motor phase failure protection circuit

Working principle of the circuit: Use wires to lead out the Y terminals of the three-phase power supply of the motor,
and connect them to the capacitor C. C3, and through these three capacitors, it generates an
artificial Y connected to the neutral point. When the motor is working normally, the voltage at the neutral point artificially connected to Y
is zero, which is consistent with the neutral point potential of the three-phase four-wire, so the voltage between the two points is zero, the rectifier
has no output, and the relay K does not operate. When a phase of the motor is disconnected,
the voltage at the neutral point artificially connected to Y will rise significantly. When the rectified voltage reaches 12 V, the relay
will close. At this time, the AC contactor controls the four-way cutoff, and the contactor is released when it loses power, thereby
achieving the purpose of protecting the motor.