Control principle of two-speed motor for quick forward and reverse rotation

In order to make the motor rotate forward and backward, two contactors KM 1 and KM2 can be used to switch to the phase sequence of the three-phase power supply of the motor, but the two contactors cannot be attracted at the same time. If they are attracted at the same time, it will lead to a short circuit accident. In order to prevent this kind of accident, reliable interlocking should be adopted in the circuit. The above picture shows the control circuit for the forward and reverse operation of the motor with double interlocking of buttons and contactors.

With the development of electronic technology, the forward and reverse rotation of the motor has been accompanied by the appearance of PLC and single chip microcomputer, and the circuit has been further improved. In addition, some proximity switches and photoelectric switches are added to the practical application circuit to realize bidirectional automatic control, which lays the foundation for the development of industrial robots.

Extended data

Positive and negative installation steps and process requirements of motor:?

1. Draw and read the circuit diagram of the control circuit of double interlocking forward and reverse motors, number the circuit elements, and define the elements used in the circuit and their functions. ?

2. Configure the used electrical components according to table 1-2, and check the model and performance. ?

3. Install electrical components on the control panel according to the layout and mark them with eye-catching text symbols. ?

4, according to the wiring diagram and sample diagram, the front of the board is wired and coded. ?

5. Check the wiring correctness of the control panel according to the circuit diagram. ?

6. Install the motor. ?

7. Connect the protective grounding wire of the motor and the metal shell of the button. ?

8. Connect wires outside the control panel, such as power supply and motor.

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