What Are The Shapes of NdFeb Motor Magnets? What Kinds Are There?
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What Are The Shapes of NdFeb Motor Magnets? What Kinds Are There?

Views: 0     Author: SDM     Publish Time: 2024-10-17      Origin: Site

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When motor manufacturers design motors, the shape and size of permanent magnets have a very important impact on the overall performance and commutation of the motor. Therefore, choosing the right shape and size of the motor magnet is of great significance.


Usually we use the motor magnet shape more than arc, tile, square, ring and other shapes. The following is a small series of magnet manufacturers to take you to discuss the advantages of different shapes of motor magnets.


1. Arc motor neodymium magnet (tile magnet, bread magnet, etc.)



Since the sintered Ndfeb is an anisotropic material. Making them into complex magnetization orientations is very difficult.


The curved magnet can form a radial ring. They are still the most common motor magnet shapes, 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.


Two, ring magnet


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 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.


Radial ring motor magnet


Compared with sintered NdFeb, injection molded ferrite, samarium cobalt magnets or injection molded NdFeb 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 Ndfeb magnet.


Sintered neodymium magnets can also be made into radially oriented 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.


Three, flat magnets


Flat (trapezoidal and rectangular) shapes are another common choice for motor magnets. Flat shape is easy for motor magnet manufacturers to process. This means lower costs for segment motor magnets.


In summary, the above content is about the introduction of different shapes of motor magnets, I hope to help you.


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