Permanent neodymium motor rotor magnet

Neodymium Magnet can be classified based on their shape, grade, and coating.

1. Shape: Sintered Neodymium Magnet come in various shapes, including disc, block, ring, cylinder, and sphere.

2. Grade: Neodymium magnets are graded based on their maximum energy product, which determines their strength. The higher the grade, the stronger the magnet. Some common grades include N35, N42, N45, N50, and N52.

3. Coating: Neodymium magnets are often coated to protect them from corrosion and damage. Common coatings include nickel, zinc, epoxy, and gold.

1. Raw material preparation: The raw materials required for neodymium magnet production are neodymium, iron, and boron. These materials are first purified and then melted in a vacuum furnace to form an alloy.

2. Milling: The alloy is then milled into a fine powder using a ball mill. The powder is then sieved to ensure uniform particle size.

3. Pressing: The powder is then pressed into a mold using a hydraulic press. The mold is designed to the desired shape and size of the magnet.

4. Sintering: The pressed magnet is then heated in a vacuum furnace at a high temperature of around 1100°C. This process is called sintering and it helps to fuse the particles together to form a solid magnet.

5. Machining: After sintering, the magnet is then machined to the desired shape and size using diamond tools.

6. Coating: The magnet is then coated with a protective layer to prevent corrosion and increase durability. The coating can be nickel, zinc, or epoxy.

7. Magnetization: The final step is magnetization, where the magnet is exposed to a strong magnetic field to align the magnetic domains in the material.

Once the magnets are magnetized, they are tested for their magnetic properties and quality. The neodymium magnets are then ready for use in various applications such as motors, generators, and magnetic separators.