Permanent magnet AC contactor is a micro-power contactor formed by replacing the traditional electromagnet drive mechanism with permanent magnet drive mechanism by using the principle of magnetic pole repulsion and opposite sex attraction.
1. Energy saving: The closing of the traditional contactor is achieved by the electromagnetic force generated by the energization of the closing coil to overcome the opening spring. Once the current becomes small, the generated electromagnetic force is insufficient to overcome the reaction force of the spring, and the contactor cannot maintain the closing state. Therefore, the closing of the traditional AC contactor must be maintained by the continuous energization of the coil. This current is from tens to thousands of milliamperes. The closing of the permanent magnetic AC contactor depends on the permanent magnetic force, and does not require the coil to generate electromagnetic force through the current for closing and holding. Only the working current of the electronic module is 0.8mA-1.5mA, so it can maximize savings Electric energy, power saving rate is as high as 99.8%.
2. No noise: The closing of the traditional AC contactor is based on the energization of the coil to generate electromagnetic force on the silicon steel sheet to attract the dynamic and static silicon steel sheet. When the grid voltage is insufficient or the surface of the dynamic and static silicon steel sheet is uneven or there are dust and foreign objects, noise will be generated. The closing of the permanent magnet AC contactor is maintained by the permanent magnetic force, so no noise will be generated.
3. No temperature rise: The traditional contactor relies on the energization of the coil to generate enough electromagnetic force to maintain the pull-in. The coil is composed of resistance and inductance. Long-term application of current will inevitably generate heat. On the other hand, the magnetic flux in the iron core will also generate heat. These two kinds of heat work together in the contactor cavity, often causing the contactor coil to burn out, and at the same time, heat generation reduces the main contact capacity. The permanent magnet AC contactor is maintained by permanent magnet force. Without maintaining the coil, there is naturally no temperature rise.
4. The contact does not flutter: The holding of the traditional AC contactor is achieved by energizing the coil. The holding power is related to the current and magnetic gap. When the voltage fluctuates in the critical state of closing and opening, the contactor is in a state of close and close, and it will continue to Vibration causes welding or burning of the contacts and burns the motor. The holding of the permanent magnet AC contactor is completely realized by the permanent magnetic force. Once the pull-in is completed, the voltage fluctuation will not affect the permanent magnetic force, either in the pull-in state or in the open state, not in the intermediate state. Therefore, the main contact will not be burned due to vibration, and the possibility of burning the motor is greatly reduced.
5. Long life and high reliability: Contactor life and reliability are mainly determined by the coil and contact life. The traditional AC contactor heats the coil and the iron core when it works, especially when the voltage, current, and magnetic gap increase, it is easy to cause heat and burn the coil. However, the permanent magnet AC contactor does not have the possibility of burning the coil.
6. Anti-electromagnetic interference: The permanent magnet magnetic circuit used in the permanent magnet AC contactor is completely sealed, and will not be subject to external electromagnetic interference or electromagnetic interference to the outside during use.
The permanent magnet with fixed polarity fixed on the contactor linkage mechanism interacts with the variable polarity soft magnet solidified on the contactor base, so as to achieve the purpose of attraction, retention and release. The variable polarity of the soft magnet is generated by the electronic module with which it is solidified to generate positive and negative pulse currents of ten to twenty milliseconds, so that it generates different polarities. According to the needs of the site, the control electronic module is used to control the set release voltage value, and the reverse pulse current can be issued after a period of time to achieve the purpose of low voltage delay release or power off delay release, so that the motor it controls It is protected from power grid sloshing and tripping, thereby maintaining the stability of the production system. This is the first AC contactor with “anti-sloshing” function created by Songfeng Electric.
A. During use, each part of the product should be regularly inspected. It is required that the movable parts are not jammed and the fasteners are not loose. If any parts are damaged, they should be replaced in time.
B. The surface of the contacts should be protected and cleaned frequently, and oiling is not allowed. When metal beads are formed on the surface of the contacts due to the arc, they should be removed in time. When the contacts are severely worn, they should be replaced in time. However, it should be noted that the contact resistance of the black oxide film formed on the surface of the silver and silver-based alloy contacts when the arc is interrupted is very low, which will not cause poor contact, so there is no need to file, otherwise it will greatly shorten the contact life.
C. The original contactor with an arc extinguishing chamber must not be used without an arc extinguishing chamber to avoid short circuit accidents. The clay extinguisher cover is fragile and collisions should be avoided. If it is broken, it should be replaced in time.