Bonded multipole magnetic rings (such as bonded neodymium iron boron and bonded ferrite multipole rings) are significant innovations in the application of permanent magnetic materials and are used across various industries.
Definition of Bonded Multipole Magnetic Ring
A bonded multipole magnetic ring is a magnetic ring formed by mixing permanent magnetic powders (such as neodymium iron boron powder and ferrite powder) with binders (such as rubber, plastic, etc.), then molding and solidifying via processes like compression molding or injection molding. These rings are magnetized to create multiple magnetic poles (typically 4, 8, 16, or even hundreds), producing a uniform, alternating magnetic field.
Advantages of Bonded Multipole Magnetic Ring
| High Dimensional Accuracy: The molding process is carried out through comprehensive pressing or injection molding, ensuring good dimensional consistency, minimal machining allowance, and higher dimensional precision, which effectively reduces the difficulty and cost of subsequent processing.
| High Performance Consistency: The molding process is relatively unaffected by magnetic fields and temperature, resulting in good consistency of the magnetic performance post-magnetization. This feature is particularly suitable for scenarios requiring high precision in pole width and angle.
| Relatively Low Cost: Bonded magnets require less material and have simpler processes, which also reduces costs associated with grinding and assembly due to the absence of segmented magnets, resulting in a high cost-performance ratio. Moreover, bonded magnets have a tight internal combination, good mechanical strength, impact resistance, and are not prone to cracking, leading to a long service life.
| Easy Installation: Bonded rings can be magnetized in multiple poles post-formation, eliminating the need for grinding after magnetization as required with segmented magnets. This simplifies installation, significantly reducing installation difficulty while avoiding the performance impact that grinding might have on the magnets.
Magnetization Methods for Bonded Multipole Magnetic Rings
The magnetization method for bonded multipole magnetic rings is flexible and can be selected based on actual needs.
In most cases, pulse magnetization must be performed using a dedicated multipole magnetizing coil (such as a ring-type multipole coil). The number of poles can be customized according to requirements (common configurations range from 4 to 48 poles, with a maximum of several hundred). The more poles there are, the higher the precision required for magnetization.
Applications of Bonded Multipole Magnetic Ring
Bonded multipole magnetic rings (such as bonded neodymium iron boron and bonded ferrite) are widely applied in the motor field due to their advantages of high dimensional accuracy, uniform magnetism, good consistency, and the ability to customize complex shapes (such as thin-walled and irregular forms).
| Stepper Motors/Brushless Motors: Bonded magnetic rings (like bonded neodymium iron boron) are isotropic, suitable for various magnetization methods (radial, axial, inclined, etc.), and can flexibly achieve multipole (4 poles, 6 poles, 8 poles, and above) magnetization, meeting the demands for a high number of poles and fine magnetic field distribution in stepper and brushless motors.
| Low-Cost Motors: The cost of bonded multipole magnetic rings is extremely low, and the injection molding/compression molding process is simple, making them suitable for mass production. They are thus widely used in cost-sensitive applications, such as toy motors and fan motors, where magnetic performance requirements are relatively lower.
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