Seven important factors in making a custom magnet
Seven important factors in making a custom magnet
If you want your custom magnet to be perfectly suited to your project, there are several important factors to refer to.
I. Magnet materials
There are several types of magnetic materials, and depending on the value you need to get from the product or how you use it, decide which material is needed to customize the magnet.
1 NdFeB: NdFeB is divided into sintered NdFeB and bonded NdFeB. The most widely used in the market is sintered NdFeB. Neodymium magnets also have a variety of uses, such as neodymium tile magnets, neodymium ring magnets and neodymium cylindrical magnets, especially for the manufacture of motor magnets.
2. Samarium cobalt (SmCo) : samarium cobalt magnet has relatively high value, high temperature resistance, corrosion resistance, generally do not do coating treatment, samarium cobalt magnet important characteristics is high temperature resistance.
3 aluminum nickel cobalt (AlNiCo) : aluminum nickel cobalt magnet coercivity is low, if not careful treatment is easy to demagnetize, and hard and brittle. They are best suited for high temperature applications.
4. Ferrite/ceramic materials: Ferrite materials can be used in a variety of electronic equipment. This is due to their hard, brittle and polycrystalline nature, which is characterized by their cheap price and being processed. Disadvantages are weak magnetism and large volume.
Different magnet materials have different grades. Ideally, the grade of a magnet is a good measure of its strength. In general, a higher grade number indicates a stronger magnet. This means that if you need a powerful magnet for your project, you should choose one with a higher number (grade).
1. Neodymium magnet: grade usually from N25 to N55.
2. Samarium cobalt magnets: Common grades range from 16 to 32.
3. Aluminum nickel cobalt magnet: common grades from 1 to 9.
4. Ferrite/ceramic magnets: Common grades from 8 to 40.
Magnetic materials come in many shapes, and these shapes determine how magnets are used. The shape of each magnet determines how strong the pull is and how the field lines line up outside the magnet. Here are some common choices for magnet shapes:
1. Square magnet: Square magnet is usually straight edge six sides, all angles are right angles (90°). These types of magnets are mainly used in fixation applications and their installation inside the channel helps to increase their fixation force. When customizing with square magnets, you need to provide data about the length, width, and height of the magnets.
2. Circular magnet: Circular magnet is a thin flat circular magnet whose thickness does not exceed its diameter. They are the most versatile and commonly used magnet shape. Disc magnets are widely used for holding applications. As with block magnets, you must also provide data on the length and diameter of the magnet.
3 arc magnet: Arc magnet is usually used in special cases, such as motors, generators and alternators, especially the rotor and stator. Again, you will need to provide specifications for the outside diameter, inside diameter, length, and Angle of the magnet.
4. Ring magnets: Ring magnets have several interesting applications, such as proving magnetic repulsion in scientific experiments and sometimes in medicine. Depending on the purpose of the customization, you will need to provide the correct magnet outer diameter, inner diameter, and length information.
Fourth, the direction of magnetization
When it comes to the direction of magnetization of a magnet, there are two main types. You can use radial or axial (radial) magnetized magnets. Radial magnetization is produced in a specially manufactured ring magnet. When the magnetization direction of the magnet lies on the axis of the magnet, it is called axial magnetization.
The direction of magnetization is very important when making magnets, because the magnet usually attracts the most when one of its poles touches the magnetic surface you want it to adhere to. Thus, for example, an axially magnetized magnet is most effective when one of the planes touches a surface.
5. The tolerance
Tolerances are actually parameters used to manufacture mechanical parts and are usually measured according to a standardized tolerance system called the International Tolerance class. Typically, the magnet tolerance is measured at +/-0.05 mm, as in neodymium magnets. However, accurate tolerance measurement mainly depends on the shape, grade and material of the magnet, and the smaller the tolerance, the higher the cost relative to the difficulty of machining.
6. The coating
The choice of magnet coating is based on the actual magnet application environment to decide. Many different coatings can be used, such as nickel-copper-nickel coating, zinc coating, epoxy coating, gold coating, etc. For neodymium magnets, polytetrafluoroethylene (PTFE) and rubber are good coating materials.
Seven. Customized quantity
Finally, the amount of material needed to make a custom magnet is another important factor to consider. To get a quote for a custom magnet, you need to supply the required quantity. In general, the greater the amount of magnet material required, the lower the unit price of a custom magnet.
These seven tips will help you more accurately customize the magnet for your project.
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