How To Find The Grade Of A Neodymium Magnet
A magnet’s grade is a reliable indicator of power. Higher numbers denote a stronger neodymium magnet. Neodymium magnets come in grades ranging from N35 to N52. Application, cost, size, operating temperature, and many other aspects are influenced by magnetic grade.
The Maximum Energy Product of the Magnet Material, stated in MGOe, is an actual material attribute that gave rise to the number (MegaGauss Oersteds). The BH Curve’s most vital point on the magnet’s demagnetization curve.
The grade or N number of a magnet affects the pull force it produces. You can roughly double the draw force by doubling the N number.
The stronger the magnet, the higher the material grade number. One significant exception to this rule is Alnico. Grade and strength do not typically correlate as Alnico is size-dependent.
When choosing the material grade for your application, take into account the following factors:
- Initial Maximum Operating Temperature
A key consideration for selecting a magnet material is its maximum operating temperature. Therefore, it is essential to determine your operating temperature range before choosing your grade.
- Required Holding Force or Magnetic Field Density
We issue a warning when evaluating the necessary magnetic field density or holding force – don’t choose a higher grade than you may need. Although it may be tempting to select the material grade with the maximum strength, it might not be suitable for the use you have in mind. It may also be unnecessarily expensive to select a grade higher than you want, especially if creating a high-volume consumer application.
- Resistance to Demagnetization
The demagnetizing resistance is the final factor when selecting a magnet grade. This aspect probably has a significant impact on your final design. The intrinsic coercive force (HCI) is closely associated with your maximum operating temperature. HCI is the demagnetization resistance. The higher your working temperature, the higher the HCI. Heat is the leading cause of demagnetizing. However, it is not the only one. Other essential elements for demagnetizing resistance are the geometry of your part and the magnetic fields generated in your system.
The damage is frequently irreparable after demagnetization takes place. Starting your project with the proper material grade will significantly impact cost and potential redesign time.
Neodymium magnets are the new age technological panacea. With the information provided above, we hope it will help you make more informed choices for your projects, and when in doubt, you have the ROBO magnetic company to see you through.
The ROBO magnetic team is an experienced neodymium manufacturing company that will help you discover the custom magnet required for your project. We have over sixteen years of experience working with customers and helping them choose the best neodymium magnet for their projects. We keep the prototype of customers’ custom orders to help guide your choices.