Block magnet is generally specified according to the Length (L) x Width (W) x T (Thickness). The first two dimensions specify the pole face’s size of each magnet, then the last dimension detail the magnetization direction, or distance between the N pole and S pole. Block magnet can be further classified to rectangular magnet, slab magnet, cube magnet, and square magnet in accordance with the relationships of above three dimensions.
Material Classifications of Block Magnet
Block magnets are available in AlNiCo block magnets, ferrite block magnets, SmCo block magnets, and Neodymium block magnets. The last two options are also collectively referred to as rare earth block magnets.
Block Magnets Calculator
Notes:
- This calculator adapts to non-coating and non-chamfer sintered Neodymium magnet, sintered Samarium Cobalt magnet, and sintered ferrite magnet.
- Gauss value is based on Biot-Savart law and applicable to calculate gauss value of pole face’s geometric center.
- Surface gauss value decreased as the air gap increased, therefore, both encapsulation of hall component and neglected air gap have the significant role on the accuracy of gauss value. We recommend users set the air gap between 0.3 and 0.5mm.
- Measurement repeatability of surface gauss is relatively low even testing point is the geometric center. It must be pointed that surface gauss cannot represent the overall magnetic performance of the magnet in comparison with magnetic flux or magnetic moment.
- Air gap between magnet and steel plate in calculator is 0mm. In reality, even very small air gap will generate dramatic influence on the pull force in both theoretical calculations and the actual measurement.
- Besides magnet’s material, grade, and dimension, pull force is also impacted by steel plate’s material, composition, and surface condition. Steel plate should be thick enough to carry all magnetic flux or result in the low pull force owing to magnetic saturation.
- Above calculation results are only for reference.
