Contactor types are typically classified based on the main contact connection circuit, which includes DC contactors and AC contactors. Additionally, they can be categorized by their operating mechanism, such as electromagnetic contactors or permanent magnet contactors.
Permanent magnet AC contactors are a type of low-power device that utilizes the principle of magnetic pole polarity and attraction. Unlike traditional electromagnets, these contactors use a permanent magnet drive system to control the operation. Some well-established domestic models include CJ20J, NSFC1, NSFC2, NSFC3, NSFC4, NSFC5, NSFC12, NSFC19, CJ40J, and NSFMR.
The design of a permanent magnet contactor involves a fixed-polarity magnet interacting with a variable-polarity soft magnet that is embedded in the base. This interaction allows for the functions of suction, holding, and release. The soft magnet’s polarity changes due to a solidified electronic module that applies short pulses of positive and negative current—typically lasting between ten to twenty milliseconds—to create different magnetic polarities.
Depending on site requirements, the control electronic module can adjust the release voltage. It can also introduce a delay in the reverse pulse current, enabling features like low-voltage delayed release or power failure delayed release. This functionality helps maintain motor control and ensures the stability of production systems by preventing grid fluctuations and ensuring smooth operation during power transitions.
Contactor classifications can also be based on their driving method, which includes hydraulic contactors, pneumatic contactors, and electromagnetic contactors. Furthermore, they can be divided by their action mode into direct-acting contactors and rotary contactors.
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