Rare Earth block magnet should be specified by the Length (L), Width (W), and T (Thickness). The first two dimensions measure the pole face’s area of block magnet and the last dimension specifies the magnetization direction, or distance between the N pole and S pole. Rare Earth block magnet can be further split into rectangular magnet, slab magnet, cube magnet, and square magnet in accordance with the scales of above three dimensions.
Classifications of Rare Earth Block Magnet
Rare Earth block magnets are a general term for SmCo block magnets and Neodymium block magnets. Neodymium magnets exhibit superior strength in magnetic power and machinability, but weak in corrosion resistance and operating temperature range compared with Samarium Cobalt magnets.
Rare Earth Block Magnet Calculator
Notes:
- This calculator adapts to non-coating and non-chamfer 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.
