What is the structure of permanent magnet household AC contactor

      The bearing current of household AC contactor is very large. Generally, the internal pull-in coil controls its action, and the control coil is operated by various types of relays connected in series with it. After thunder, it will trip because the relay of household AC contactor has the function of over-current or grounding protection. When there is lightning on the line, it will control the household AC contactor to act, cut off the load power supply, and protect the equipment from being damaged by high voltage, large current or grounding.

      Household AC contactor is widely used as power breaking and control circuit. Household AC contactor uses main contact to open and close circuit, and auxiliary contact to execute control command. The main contact usually has only normally open contact, while the auxiliary contact often has two pairs of normally open and normally closed contacts. Small contactors are often used as intermediate relays to cooperate with the main circuit. So as to play the function of remote control or weak current control strong current.

      The contact of household AC contactor is made of silver tungsten alloy, which has good conductivity and high temperature ablation resistance. Household AC contactor is divided into permanent magnet household AC contactor and electromagnetic household AC contactor.

      The action power of household 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 covered with coil. There are many kinds of working voltages to choose from. In order to stabilize the magnetic force, a short-circuit ring is added to the pull-in surface of the iron core. After the household AC contactor loses power, it depends on the spring to return. The other half is a movable iron core with the same structure as the fixed iron core, which is used to drive the opening and closing of the main contact and auxiliary contact.

      Permanent magnet contactor is a new type of micro power consumption contactor which uses permanent drive mechanism to replace the traditional electromagnetic drive mechanism. The working principle is to use the principle that the same polarity repels each other and the opposite polarity attracts each other. 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 signals, the electronic module solidified together with the soft iron generates a positive and negative pulse current of more than ten to twenty milliseconds, which makes the soft iron produce different polarity, so that the main contact of the contactor can achieve the purpose of closing, maintaining and releasing.

      The structure of electromagnetic household AC contactor is mainly composed of electromagnetic system, contact system, arc extinguishing system and other parts.

      1. Electromagnetic system: the electromagnetic system includes electromagnetic coil and iron core, which is an important part of the contactor. It drives the contact to close and open.

      2. Contact system: contact is the executive part of contactor, including main contact and auxiliary contact. The function of the main contact is to make and break the main circuit to control large current, while the auxiliary contact is in the control circuit to meet the requirements of various control modes.

      3. Arc extinguishing system: the arc extinguishing device is used to ensure the reliable extinction of the arc generated when the contact breaks the circuit and reduce the damage of the arc to the contact. In order to quickly extinguish the arc when it is disconnected, the contactor is usually equipped with arc extinguishing device, which generally adopts semi sealed longitudinal seam ceramic arc extinguishing cover and is equipped with strong magnetic arc blowing circuit.

      4. Other parts: insulation shell, spring, short circuit ring, transmission mechanism, etc.

      The advantages of permanent magnet contactor are as follows: 1. Good working reliability, no interference from network voltage. 2. The movement speed is fast, which is 0.12-0.15s, and the traditional is 0.35-0.38s. 3. Quiet operation, no AC noise, not affected by dust and oil. 4. The module has no temperature rise, aging resistance and corrosion resistance, and its super long service life is three times that of the traditional one. Energy saving, environmental protection, super maintenance rate of 5.99%.