How to Choose Suitable Permanent Magnets?
Neodymium Magnets, SmCo, AlNiCo, Ferrite Magnets Manufacturer China Rare Earth Magnet Limited
How to choose permanent magnet?
Magnet Purchase Note
1. What are the material and the performance like N35 neodymium magnet, Sm2Co17, AlNiCo5, Y30 ferrite?
2. What are the dimensions and tolerances?
3. Do the magnets need to be magnetized? If yes, what is the magnetized direction, Axial or diameter?
4. What is the highest working temperature of the magnets?
5. What is your order quantity?
6. What is the surface treatment?
7. Please advice, if you need special treatment on the magnets.
Representing Methods of Permanent Magnets
1. D is always used to indicate the diameter of ring magnets (due to the special symbol, now people often replace Φ with.). For example, in D10x2mm, the diameter is 10mm and thickness is 2mm. “x” means mathematic times sign.
2. As for block magnet, F is always used to indicate block magnets. Dimension of block magnets is showed as length x width x height. For example, in F60x20x10mm, the length is 60mm, width 20mm, and thickness 10mm. By default, we always consider the last number as the magnetized direction of the block magnet. In F60x20x10, the magnetized direction is the direction of 10mm—that is the direction of thickness. N pole and S pole will be in the biggest sides, which is the side of 60x20.
3. Dimension of ring magnets will be showed as outer diameter x inner diameter x height. For example, in D32Xd18X6, the outer diameter is 32mm, inner diameter 18mm and height 6mm. Height is also called thickness. Currently, ring magnets can be classified into magnets with straight holes and countersunk holes. The straight holes are directly punching holes. On the other hand, countersunk holes can be classed into big holes and small holes, and there are depths of big holes and of small holes which are commonly called thread holes.
4. Ball magnets can simply be showed as D. For example, D5mm means a ball magnet with 5mm diameter.
Temperature
Customers should choose grades of neodymium magnets according to working temperature. Magnetism will gradually fade away under temperature that its grade can not endure. Thus, please confirm working temperature and grade of the magnets that you need.
Environment
Under completely sealed circumstance, magnets should be coated with white Zn or uncoated, in which way cost can be reduced. On the contrary, if magnets are exposed to wet air, especially to salt air, magnets should be coated with Ni. Magnets should be put under places which is dry and with constant temperature. Also, magnets should be wrapped and separated with plastic, hard sheet and foam, away from irons and things that can be easily magnetized, such as displayers, bank cards, computers, TVs and mobiles.
Transport and Place
Because neodymium magnets are hard, bristle and with strong magnetic field, we should fetch and place softly (especially magnets in big dimension and thin sheet). When strong magnets attract or separate with other irons, we should not bunch them, otherwise, magnets may be destroyed or fingers may be injured. For neodymium magnets are metal alloys with its density in 745, they are heavy and frail. So we should move the magnets carefully in case that they will crack. Warehouse of magnets should be dry. Also, do not put the magnets directly on the ground. Magnets should be put on thick sheet or shelves.
Notes of Separating Permanent magnets
We should two attracted magnets by slowly pulling them in parallel instead of pry the magnets. Stabilizing the magnet with your left hands, you can move the other magnets in parallel with your right hands. Also, do not throw the magnets in piles immediately when you separate them. Magnets should be put softly and placed away from irons or magnetized objects or be wrapped in thick paper. Please slowly put the magnets back in the other magnets. You should hold the magnets till it entirely shifts in the magnets.
How to choose permanent magnet?
Magnet Purchase Note
1. What are the material and the performance like N35 neodymium magnet, Sm2Co17, AlNiCo5, Y30 ferrite?
2. What are the dimensions and tolerances?
3. Do the magnets need to be magnetized? If yes, what is the magnetized direction, Axial or diameter?
4. What is the highest working temperature of the magnets?
5. What is your order quantity?
6. What is the surface treatment?
7. Please advice, if you need special treatment on the magnets.
Representing Methods of Permanent Magnets
1. D is always used to indicate the diameter of ring magnets (due to the special symbol, now people often replace Φ with.). For example, in D10x2mm, the diameter is 10mm and thickness is 2mm. “x” means mathematic times sign.
2. As for block magnet, F is always used to indicate block magnets. Dimension of block magnets is showed as length x width x height. For example, in F60x20x10mm, the length is 60mm, width 20mm, and thickness 10mm. By default, we always consider the last number as the magnetized direction of the block magnet. In F60x20x10, the magnetized direction is the direction of 10mm—that is the direction of thickness. N pole and S pole will be in the biggest sides, which is the side of 60x20.
3. Dimension of ring magnets will be showed as outer diameter x inner diameter x height. For example, in D32Xd18X6, the outer diameter is 32mm, inner diameter 18mm and height 6mm. Height is also called thickness. Currently, ring magnets can be classified into magnets with straight holes and countersunk holes. The straight holes are directly punching holes. On the other hand, countersunk holes can be classed into big holes and small holes, and there are depths of big holes and of small holes which are commonly called thread holes.
4. Ball magnets can simply be showed as D. For example, D5mm means a ball magnet with 5mm diameter.
Temperature
Customers should choose grades of neodymium magnets according to working temperature. Magnetism will gradually fade away under temperature that its grade can not endure. Thus, please confirm working temperature and grade of the magnets that you need.
Environment
Under completely sealed circumstance, magnets should be coated with white Zn or uncoated, in which way cost can be reduced. On the contrary, if magnets are exposed to wet air, especially to salt air, magnets should be coated with Ni. Magnets should be put under places which is dry and with constant temperature. Also, magnets should be wrapped and separated with plastic, hard sheet and foam, away from irons and things that can be easily magnetized, such as displayers, bank cards, computers, TVs and mobiles.
Transport and Place
Because neodymium magnets are hard, bristle and with strong magnetic field, we should fetch and place softly (especially magnets in big dimension and thin sheet). When strong magnets attract or separate with other irons, we should not bunch them, otherwise, magnets may be destroyed or fingers may be injured. For neodymium magnets are metal alloys with its density in 745, they are heavy and frail. So we should move the magnets carefully in case that they will crack. Warehouse of magnets should be dry. Also, do not put the magnets directly on the ground. Magnets should be put on thick sheet or shelves.
Notes of Separating Permanent magnets
We should two attracted magnets by slowly pulling them in parallel instead of pry the magnets. Stabilizing the magnet with your left hands, you can move the other magnets in parallel with your right hands. Also, do not throw the magnets in piles immediately when you separate them. Magnets should be put softly and placed away from irons or magnetized objects or be wrapped in thick paper. Please slowly put the magnets back in the other magnets. You should hold the magnets till it entirely shifts in the magnets.
