Magnetic assemblies are aimed at prevent prevent brittle magnet to crack and significantly improve magnetic strength. Pot magnets are the outstanding representative which embodies these two advantages. The structure of conventional pot magnets consists of the permanent magnet, steel shell, and spacer. Sintered Neodymium magnets, sintered Samarium Cobalt magnets, ferrite magnets and AlNiCo magnets are all can be served in the pot magnets.
Magnetic field lines of pure magnet distribute freely in the air. The permeability of the steel shell and attracted part are much higher than air’s, and magnetic field line certainly conducts from them. For pot magnets, permanent magnet is encased within a steel shell, then constitute an integrally magnetic field with attracted part and magnetic field lines are converging on this circuit. Thus, create several times higher attractive force than pure magnet.
Besides the mounting options, pot magnets also can be divided into turning type and stamping type according to the processing technology of the steel shell. Stamping type is the mainstream product in pure quantity term due to the price advantages compared to turning design. But turning type is free of tooling cost and has more abundant products series, especially large series like fishing magnets. In the meanwhile, turning type has superior machining accuracy which results in little higher attractive force in comparison with stamping type.
Besides magnet’s grade and structure parameters, attractive force of pot magnets is also directly influenced by the material, composition, and size of testing object. The attractive force declined with increasing air gap, and even small air gap will generate dramatic effect on the attractive force in practical application. Contact way between pot magnet and object may cause neglected air gap at the same time.