Write out the double interlock mechanism of forward and reverse control circuit of three-phase asynchronous motor

Electrical interlock, mechanical interlock

How to draw the control circuit diagram of three phase asynchronous motor with positive and negative rotation and interlock?

This is the main circuit and control circuit diagram

Function of AC contactor in circuit

AC contactors are widely used as power breaking and control circuits. AC contactors use the main contact to open and close the circuit, and the auxiliary contact to execute the control command. The main contact generally has only normally open contact, while the auxiliary contact often has two pairs of contacts with normally open and normally closed functions, Small contactor is often used as an intermediate relay with the main circuit, so as to play the function of remote control or weak current control strong current
The contact of AC contactor is made of Ag - W alloy with good conductivity and high temperature ablation resistance
AC contactor is divided into permanent magnetic AC contactor and electromagnetic AC contactor
The action power of AC contactor comes from AC electromagnet. The electromagnet is made up of two "mountain" shaped young silicon steel sheets, one of which is fixed, and the coil is covered on it. There are many kinds of working voltages to choose from. In order to make the magnetic force stable, the pull-in surface of iron core is added with short circuit ring. After the AC contactor loses power, it relies on spring to return. The other half is movable iron core, which is the same structure as fixed iron core, It is used to drive the opening and closing of main contact and auxiliary contact
Permanent magnet contactor is a new type of low power consumption contactor which uses permanent drive mechanism instead of traditional electromagnetic drive mechanism
Because the polarity of the permanent magnet installed on the linkage mechanism of the contactor is fixed, and the soft iron fixed on the base of the contactor under the action of external control signal, its solidified electronic module generates more than ten to twenty milliseconds of positive and negative pulse current, which makes the soft iron produce different polarity, Thus, the main contact of the contactor can be pulled in, maintained and released
The advantages of permanent magnet contactor are as follows: (1) good working reliability, no interference from network voltage. (2) fast action speed, 0.12-0.15s, traditional 0.35-0.38s. (3) quiet operation, no AC noise, no dust and oil pollution. (4) no temperature rise, aging resistance, corrosion resistance, super long service life is three times of traditional. (5) maintenance free, super energy saving and environmental protection, energy saving rate of 99%
The contactor with more than 20 amperes is equipped with arc extinguishing cover. The electromagnetic force generated when the circuit is disconnected can quickly break the arc to protect the contact
AC contactor as a whole, shape and performance are constantly improving, but the function is always the same. No matter how the technology develops, AC contactor still has its important position

What's the difference between the double interlocking positive and negative control circuit of the button contactor of three-phase asynchronous motor and the interlocking positive and negative control circuit of the contactor?

Double interlock: button and contactor each have a normally closed contact in series in another contactor control circuit. It has double safety guarantee and fast and simple commutation
Contactor interlock: in essence, it is the interlock function of the contactor. Only one normally closed contact of the contactor is connected in series in the control circuit of another contactor. If a single contactor is stuck or the contact is stuck, the phase to phase short circuit will occur, and the commutation is troublesome. First, press the stop button

Write out the double interlock mechanism of forward and reverse control circuit of three-phase asynchronous motor