Joke Collection Website - Talk about mood - The internal circuit diagram of the electric valve is as follows. I hope the master can explain how it is done. What are the special uses of capacitors?

The internal circuit diagram of the electric valve is as follows. I hope the master can explain how it is done. What are the special uses of capacitors?

First of all, let's talk about the function of the capacitor: this is a phase-shifting capacitor, which is used to generate a starting rotating magnetic field in a single-phase motor to make the motor rotate in a certain direction.

Working principle: The change-over switch on the left (terminals 3 and 4) is a control switch, which is used to control the opening and closing of the valve. The position shown in the circuit diagram is fully open, the motor circuit is disconnected and stopped, and the on indicator (terminal 5) is on. When closing the valve, turn the change-over switch to the closed position (terminal 4), turn on the power supply at the lower end of the motor to close the valve reversely, turn on the indicator light to turn off the power supply, and quickly turn on the travel switch (corresponding to terminal 3) to return to normal, so that the motor circuit is closed and the indicator light circuit is disconnected. When it is completely closed, the closing travel switch (limit switch, corresponding to terminal 4) operates, the motor is powered off, and the closing indicator (terminal 6) lights up at the same time. When the valve is to be opened, turn the change-over switch to the open position (terminal 3), the upper end of the motor is connected with the power supply, and the motor rotates forward to open the valve ... The rest process is similar to closing, so analyze it yourself.