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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 is a small size ring rare earth magnet, N38M grade, the outer diameter of the ring is 11mm, the hole is 2mm, which is also relatively small, the thickness is 5mm, the surface is plated with bright nickel, this type of magnet is suitable for passing through some thin shafts....
This is a very hot neodymium round magnet size, diameter 10mm, thickness 2mm, in many areas can be applied, the only difference is that different customers choose the coating, performance level and temperature resistance performance on the difference, the magnet weighs about 1.2g....
This product is a bowl-shaped magnet, because its shape is like the rice we eat. It is processed into a concave shape on the basis of a circular magnet, which belongs to the special-shaped magnet category. Our company is good at processing various complex special-shaped neodymium magnets. Welcome to all over the world. Customer service....
This is a ring magnet with an outside diameter of about 2 inches, belongs to medium size, made of rare earth neodymium material, the hole in the center is 40mm, thickness 5mm, the customer chooses N38 grade,...
Product is a Y30 (C8) grade round ferrite magnet, the N pole has a pit, the surface magnetic field strength is about 1300 Gauss, the specific size is 18mm in diameter, 8mm in thickness, magnetized in the thickness direction, and the tolerance is ±0.1mm....
You are now browsing this is a 4 inch ceramic ferrite ring magnet, by the courage magnet manufacturers physical samples photographed, magnetic ring outer diameter 110mm, hole 50mm, thickness 6mm....
You are now browsing this magnet is the diameter of 80mm series of round rare earth magnets, the thickness of 10mm, nickel-plated surface, the thickness of the magnetization....
We can provide various sizes of thin rectangular neodymium magnets, ultra-thin round magnets, ultra-thin square magnets, with high dimensional accuracy, stable performance is not easy to demagnetize, welcome to contact us for a quote....