Ferrite multipole magnetic rings and ferrite magnetic tiles are two commonly used forms in electric motors. A multipole magnetic ring is a circular magnet with multiple NS on its surface, while a magnetic tile represents one pole. Eight magnetic tiles represent eight poles. Today, let's talk about the advantages and choices of ferrite multipole magnetic rings and magnetic tile composite rings.

The multipole magnetic ring and magnetic tile are combined to form a ring, which can be magnetized by the outer circle or the inner circle, and can be used as a rotor or stator. Compared to the two structures, the multipole magnetic ring rotor has the advantages of high mechanical accuracy and good concentricity. The multipole magnetic ring can be easily processed by a coreless grinder, and the outer circle accuracy can be guaranteed to be within 0.05mm, which is crucial for the efficiency and stability of the motor. However, the magnetic tile needs to be ground on a single piece and then assembled from multiple pieces, resulting in much lower dimensional accuracy and often doubling the tolerance.

In addition, the core of the multipole magnetic ring rotor does not require the use of magnetic conductive materials, and plastic can be used because a closed magnetic circuit has been formed within the magnetic ring wall. The magnetic tile combination rotor must use silicon steel sheet type magnetic conductive materials, otherwise serious magnetic leakage and significant magnetic flux loss will occur, leading to a decrease in the surface magnetic flux density of the rotor.

According to experiments and analysis by some engineers, ferrite multipole magnetic ring rotor and magnetic tile combination rotor each have their own characteristics and corresponding application ranges, but there are also cross sections& Flash; The area where the two compete. For small-sized rotor magnets, such as those below 40mm, especially those with a large number of poles, a reasonable solution is to use a multipole magnetic ring, and the current situation at home and abroad is also the same. For rotors with high power requirements and larger rotor sizes, such as over 100mm, it is currently more reasonable to use magnetic tile splicing, as this large-sized multipole magnetic ring has more special requirements for the equipment, significantly increases manufacturing costs, and eliminates performance advantages.