Multi-pole magnetic rings are called “natural Halbach arrays” because they are very similar in design and function to the principles of the Halbach Array. Here are the specific reasons:
1. The principles of magnetic field enhancement and weakening are the same
The Halbach Array is a specially arranged magnet array, which is characterized by enhancing the magnetic field on one side and almost completely eliminating the magnetic field on the other side. The direction and strength of the magnetic field are cleverly controlled by carefully designing the arrangement of the magnets.
The multi-pole magnetic ring forms a multi-pole arrangement on the surface of the ring magnet through a magnetization process, so that the magnetic field on one side is enhanced, while the magnetic field on the other side is relatively weak or disappears. The result of this multi-pole magnetization is very similar to the effect of the Halbach array.
Both can reduce leakage flux, improve magnetic field utilization, reduce the demand for magnet materials, save costs and reduce overall weight.
2. Magnetic field distribution
In a multi-pole magnetic ring, the magnetic poles are evenly arranged in a specific way (usually alternating positive and negative), so that the magnetic field forms a concentrated and orderly distribution in one direction.
This is consistent with the concept of the Halbach array using a specific arrangement to control the magnetic field distribution.
3. Natural construction method
The multi-pole magnetic ring is magnetized once through a magnetizing device, directly forming a magnetic field distribution similar to the Halbach array, without the need to accurately assemble multiple independent magnets like the Halbach array. Therefore, the multi-pole magnetic ring is called a “natural” Halbach array.
4. Similarity of application scenarios
The application scenarios of the Halbach array and the multi-pole magnetic ring are very similar. They are mainly used in the fields of motors, sensors, and consumer electronic lights.
The multi-pole magnetic ring achieves a magnetic field distribution effect similar to the Halbach array through a clever magnetization method, so it can be regarded as a “natural” Halbach array. It not only simplifies the manufacturing process in design, but also retains the efficient magnetic field enhancement characteristics, which makes it widely used in engineering and industrial fields.
