Coating:Nickel, Zinc, etc
The permanent magnetic contactor is a new type of low-voltage switch electrical appliance. It uses the working principle of electromagnetic operation and permanent magnet retention to overcome the shortcomings of the traditional electromagnetic contactor, such as large energy consumption, large working noise, and large influence of the grid voltage. Very good energy saving effect.
1. The NdFeB magnet has high remanence, high coercive force, high energy product and high ratio between performance value and product cost.
2. It can be easily formed into various sizes.
3. Smaller size and lighter weight in designing devices.
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. Contact ablation is mainly caused by the arc generated during opening and closing. Compared with the traditional contactor, when the permanent magnet AC contactor is closed, in addition to the same electromagnetic force, it also has the role of permanent magnetism, so the closing speed is much faster than the traditional AC contactor. The closing time of the contactor is generally less than 20ms, while the closing speed of the traditional contactor is generally around 60ms. When opening, the permanent magnet AC contactor has the role of magnetic pole repulsion in addition to the opening spring. These two functions make the opening speed much faster than the traditional contactor. After detection, the permanent magnet AC contactor is divided The brake time is generally less than 25ms, while the traditional contactor opening speed is generally more than 80ms. In addition, the heat of the coil and the iron core will reduce the capacity of the main contact, and the insufficient suction or vibration caused by the voltage fluctuation will make the main contactor of the traditional contactor heat, arc or even weld. Compared with traditional AC contactor contacts, the life of permanent magnet AC contactor contacts is 3-5 times longer under the same conditions.
6. Anti-electromagnetic interference
The permanent magnet magnetic circuit used in the permanent magnet AC contactor is completely sealed, and it will not be subject to external electromagnetic interference or electromagnetic interference to the outside during use.
The permanent magnet AC contactor utilizes the principles of magnetic pole repulsion and heterosexual attraction to realize the connection and segmentation of the main circuit. A new type of micro power contactor formed by replacing the traditional electromagnet drive mechanism with a permanent magnet drive mechanism. 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 the disturbance (shaking) caused by large fluctuations in the grid voltage, thereby maintaining the stability of the production system and ensuring safe production.
Permanent magnet contactors have a wide range of applications and can be used to control electrical loads such as motors, electric heaters, illuminators, capacitors, and welding machines.
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