How does the permanent magnet system produce magnetic attraction? The first is the magnetic circuit in the permanent magnet chuck, a good magnetic circuit structure can make more magnetic force gather in the working surface as much as possible, meet the role of lifting and lifting but also meet the requirements of lifting the weight of lifting items, and can use less NdFeb material to produce greater magnetic attraction. At the same time, the design of the magnetic circuit should also carefully consider that the operator is easier to achieve working unloading. Solve the technical difficulties such as the large suction force of the permanent magnet chuck and the difficulty of pulling the handle.

　　The magnetic circuit design of the permanent magnet chuck has two magnetic systems, which are divided into two parts: active and fixed. By changing the state of the active magnetic system through relative motion, the working pole surface is in a state where the magnetic field is superimposed or the reverse magnetic field is generated and the magnetic field is cancelled, so as to achieve holding and unloading. The magnetic force line comes out through the permanent magnet chuck through the working face and then returns to the permanent magnet chuck. This process can firmly suck the permanent magnet chuck to the working pole surface. The magnetic force line does not come out through the permanent magnet sucker, and the closed magnetic circuit is formed inside, and the suction force will not be generated on the workpiece, so as to achieve the purpose of unloading.

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