China Neodymium And Ferrite Magnets Manufacturer & Supplier 
In applications such as motors or magnetic encoders, you'll find that 6-pole magnetic rings (3 pairs of poles) are relatively uncommon, with 4-pole, 8-pole, and similar configurations being more prevalent. What is the reason for this?
First, let's briefly compare the structures of 4-pole, 6-pole, and 8-pole magnetic rings. The 4-pole ring (90° per pole) features the simplest structure, offering easy magnetization and high magnetic field strength (a wider single pole width provides stronger magnetic flux). It is the preferred choice for low-power motors (<500W) and cost-sensitive applications. The 8-pole configuration (45° per pole) offers a finer pole pitch, resulting in reduced torque ripple, higher control precision, and lower noise. It is the mainstream choice for mid-to-high-end applications. The 6-pole configuration occupies an intermediate position: it is slightly more complex than the 4-pole but offers limited improvement, and while simpler than the 8-pole, its performance is not sufficiently outstanding, leaving it in a “neither here nor there” predicament.
6-Pole Magnetic Ring Pole Distribution Structure
Furthermore, the 6-pole magnetic ring imposes significant constraints on the selection of stator slots, which is a major reason for its limited application. Motor design typically emphasizes the slot-pole ratio (the combination of stator slots and rotor poles). Common combinations include: 12 slots with 4-pole/8-pole, 9 slots with 8-pole (6-pole), 24 slots with 4-pole/8-pole, and 36 slots with 4-pole/8-pole. The available combinations for 6-pole configurations are relatively limited. Furthermore, certain combinations (such as 9 slots with 6 poles) offer lower costs but involve significant performance trade-offs, hindering their adoption in high-performance applications.
Although 6-pole magnetic rings are relatively uncommon, they still have a market presence. For instance, they are utilized in scenarios such as magnetic encoder sensing, specialized structural sensors, electrical appliances, and certain 9-slot 6-pole motor designs.
The above explains why 6-pole magnetization is less frequently adopted for magnetic rings. Should your company require multi-pole magnetic rings, please contact Carriqi for samples and pricing.
Relevant 6-pole ring magnet samples;
6 pole radially magnetized ring magnet Φ25.5 x 12 x 3 mm