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We all know that magnets are commonly used on motors, but the magnets used by different motors are not only different sizes, but also different shapes. The basic shapes are arc/wedge/bread-shaped, rectangle, ring and flat block shapes, Let's talk about their respective characteristics.
Motor arc magnets, also often referred to as tiles shape magnet, segment shape magnet, wedge shape magnet, bread magnet, etc.
Curved segment magnets are the most commonly used magnet shapes for electric motors, especially for DC motors and magnetic rotors. The curved magnet will bring the magnet closer to the stator. So it can reduce the air gap and increase the flux between them. In addition, it also has the effect of reducing vibration and noise.
Below is a image of ferrite arc magnet used in motor:
Motor ring magnets
In theory, a ring magnet is the best shape for a motor magnet. More precisely, these rings are radial toroidal motor magnets. They have many of the following advantages:
1. Easy to assemble
2. Good stability
3. Better geometric accuracy
4. Excellent motor performance
5. A variety of magnetization directions
6. The magnetic field is evenly distributed
However, due to the limitation of material properties and manufacturing process, not all magnets can be made into radially oriented rings. There are two main radial ring magnets. One is a bonded neodymium magnet and the other is a sintered neodymium magnet.
Molded magnets are designed for different motors such as pump motors, vacuum motors, gated motors, stepper motors, brushless motors, DC motors, starting motors and conveying motors. They are made by hot extrusion and deformation.
Compared with sintered neodymium magnets, injection molded ferrite magnets, samarium cobalt magnets or injection molded neodymium magnets have advantages in terms of control accuracy and yield. They are the most flexible permanent magnets and can be magnetized in a variety of ways to make different complex shapes. But the magnetic field is much lower than the sintered chin-iron boron magnet.
Sintered NdFeb magnets can also be made into radially magnetized magnetic rings. But the cost is very expensive because they require additional magnetizing clamps and magnetizing coils. There are also many limitations on size and grade.
Below is a image of NdFeb ring magnet:
Flat (trapezoidal and rectangular) shapes are another common choice for motor magnets. Flat shape is easy to process for motor magnet manufacturers. This means lower costs than segment motor magnets.
The above is an rough introduction to the shape types and advantages of electric motor magnets. As a permanent magnet manufacturer, we also have various types of neodymium motor magnets and ferrite motor magnet ring/arc/Squre to choose from. If you have needs, please contact us.
Motor magnet products please click:
This product is round ferrite magnet with a diameter of 9mm and a thickness of 3mm, the performance class is Y30, magnetized in the thickness direction, without electroplating protective layer, the magnetic force is usually 700-1000gs, the working temperature is -40°C to +250°C, Suitable for sensors, suction parts, electrical appliances, Hall induction....
This is a very small size rectangular block magnet with galvanized surface, 3mm length, 1.5mm width and height, with very fine tolerance, magnetized by lengthwise direction, mainly used in precision electronics, instrumentation, please contact us if you need to buy....
Flat magnets can be flat square magnets or round magnets. Today's sample is a flat rectangular magnet, with a length of 20mm, a width of 10mm, a thickness of 1.5mm, and a zinc coating on the surface. Thickness magnetization is used for thin workpieces. The use of this relatively flat neodymium rectangular magnet requires special attention....
Looking for suppliers of radial 16 pole ring magnet and multi-level magnetic ring, welcome to contact carrich magnet manufacturers in China. We have more than 10 years of experience in the motor magnet industry. Our products have many specifications and good performance, which are highly praised by customers at home and abroad. We welcome to provide specifications, samples and batch prices....
This is a dedicated to screwdrivers, drills on top of the ring magnet, the material is rare earth neodymium, N38 grade, outer diameter 15mm, height 10mm. hole diameter 7mm, the use of very simple, is to set the magnetic ring in the screwdriver (screwdriver head) on top of the purchase of the hole is recommended to be larger 1mm....
Product name: 9.5mm diameter thickness 1.5mm neodymium intense magnetic，Type of magnet: permanent magnet，Magnet shape: Round，Magnet class: n45，Tolerance: ±0.05，Coating: conventional nickel copper nickel，Pull: About 1.6 pounds，Magnetic strength: about 2200 Gauss....
This is a C8 grade ceramic ferrite block rectangle, with white marks made according to the customer's requirements. The magnet size is 13mm long, 11mm wide and 10mm thick. If you are interested in such a magnet, you can contact us to provide you with samples, prices,...
This is a 6-pole ring magnet made of injection molded ferrite, with an outer diameter of 9.5mm, an inner hole of 1mm, a thickness of 2mm, single-sided 6-pole magnetization, 3 N poles and 3 S poles. It is mainly used for Hall encoder....