Learn the motor forward and reverse circuit in one minute. The motor starts in sequence and stops in reverse sequence!

As the most basic circuit, the forward and reverse rotation of the motor must be understood when studying electrical engineering.

To learn the forward and reverse circuit of the motor, you must understand the working principle of the motor forward and reverse. That is, when we press the forward start button, the motor will rotate forward. At this time, pressing the reverse start button will not work. Only by pressing the stop button and stopping the motor can the motor be started to reverse.

Motor forward and reverse circuit diagram

First, to connect the motor forward and reverse circuit, you need a stop button, a forward start button, a reverse start button, and two contactors. Both contactors must have normally open and normally closed auxiliary contacts, such as 1211 contactors. Connect according to the circuit diagram above.

Press the forward start button and the motor will rotate forward.

Pressing the reverse start button has no effect at this time

When we press the forward start button, the motor rotates forward. When we release the start button, the motor self-locks. At this time, the normally closed contacts of the forward contactor are disconnected. Pressing the reverse start button at this time has no effect.

Press the stop button

Only when we press the stop button, the motor stops, the forward contactor loses power, and the normally closed contact returns to the on state.

Press the reverse start button

When the motor is in reverse, press the forward start button

At this time, press the reverse start button and the motor will reverse and lock itself. Correspondingly, pressing the forward start button at this time will have no effect.

This is the principle of forward and reverse rotation of the motor, and also the interlocking principle of the contactor. It is very commonly used when electricians collect evidence, so you must understand it.

I have talked about the self-locking circuit and interlocking circuit of the motor before. In our work, we often encounter such problems. There are two motors 1 and 2. Motor 2 can only be started after motor 1 is started. When stopping, motor 2 must be stopped before motor 1 can be stopped.

Motor sequential start and reverse stop circuit diagram

If two motors are connected according to the self-locking circuit, the starting sequence must be paid attention to manually, but there will be times when mistakes are made. How can we avoid misoperation? This is what we will talk about today, starting the motor sequentially and stopping it in reverse order. The figure above is a circuit diagram of starting the motor sequentially and stopping it in reverse order. Next, let's take a look at the simulation action.

Press motor start 2, the motor does not move

Press the start switch 1, and the motor 1 starts

In the above figure, we can see that when motor 2 is started directly without starting motor 1, motor 2 cannot be started. However, when we press the start button of motor 1, motor 1 can be started normally.

Press the start switch 2, and the motor 2 starts

After motor 1 starts, press the start button of motor 2, and motor 2 can also start normally.

Press the stop button 1, the motor keeps working

Press the stop button 2, motor 2 stops

When we need to stop the motor, if we stop motor 1 first and press the stop button of motor 1, the motor will not stop. Only if we press the stop button of motor 2 first, motor 2 can stop.

Press the stop button 1, and the motor 1 stops working.

After the motor 2 stops, the motor 1 can be stopped normally by pressing the stop button of the motor 1.

This is the sequential start and reverse stop of the motor.