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Radial ferrite magnets, a type of ferrite magnet employing radial (diameter) magnetization, differ from axially magnetized magnets in which magnetic poles are concentrated at the top and bottom surfaces. Instead, the north and south poles of radially magnetized magnets are distributed around the circumference or at the inner and outer diameters. This magnetization method is particularly suited for rotating structures and annular spaces, such as various motors and sensors. These magnets primarily use strontium ferrite or barium ferrite as their main raw materials, offering characteristics of low cost, corrosion resistance, high-temperature tolerance, and excellent stability.
Type 1 - Standard Radial Ferrite Magnetic Rings
These refer to ferrite permanent magnets with an integral ring structure and a magnetic field oriented along the diameter. They are also known as diameter-magnetized ring magnets or ferrite ring magnets.
Type 2 - Multi-Pole Radial Ferrite Rings
Multi-pole radial ferrite rings feature multiple pairs of alternating N-S magnetic poles arranged circumferentially, with each pair magnetized radially. For example, a 4-pole radial ring has four magnetic pole regions distributed around its circumference. Within each region, magnetic flux lines still traverse the inner and outer surfaces radially, but adjacent regions exhibit opposite polarity. This design is particularly suitable for applications requiring position detection or rotational speed sensing. For instance, in washing machine motors, air conditioner fans, and Hall sensor systems, 8-pole, 12-pole, or 16-pole radial ferrite rings are commonly employed to achieve higher detection resolution.
Schematic Diagram of Conventional Magnetization vs. Multipolar Magnetization for Radial Ferrite Magnets
Type 3 - Radial Ferrite Magnetic Segments (Sector/Arc-Shaped)
These magnets typically consist of multiple segments assembled into a circular structure. Each segment undergoes individual radial magnetization. By adjusting the number and arrangement of segments, the magnetic field distribution can be optimized. Typical configurations include 4, 6, or 8 segments forming a ring, with each segment covering a corresponding central angle. However, assembly presents certain challenges.
The above covers what radial ferrite magnets are and their various types. Beyond shape, they are also categorized by material into sintered and injection-molded radial ferrite types. For quotes or samples of radial ferrite magnets, please contact our online customer service.
Radial Ferrite Product Selection: