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The magnetic ring materials used for detection in magnetic encoders typically include ferrite (sintered/injection-molded/rubber) and neodymium (injection-molded/bonded). Magnetic ring types can be categorized as single-pole magnetic rings, multi-pole magnetic rings, multi-pole dual-track magnetic rings (for absolute position encoding), and non-uniformly magnetized magnetic rings (for complex encoding applications). Below is an introduction to the characteristics and applications of these magnetic ring types.
Single Pair Pole Magnetic Ring
This magnetic ring features a single magnetic pole pair, i.e., two poles. By placing two linear Hall sensors at a 90° angular offset within the magnetic field, a pair of orthogonal waveforms can be obtained. The unique angular position can be calculated using the inverse tangent function arctan(y1, y2).
A circular magnet with 2 or more pairs of magnetic poles, such as a 64 pole planar magnetized magnetic ring containing 32 pairs of magnetic poles. When it rotates, the Hall sensor outputs 32 complete sine wave cycles, which is commonly used in incremental encoders.
Multi Pair Pole Dual Code Track Magnetic Ring
Multi pole dual code track magnetic ring is a type of magnetic ring with two independent magnetic pole arrangement trajectories, widely used to improve the resolution and anti-interference ability of magnetic encoders, and provide more accurate position information. Due to the difference in pole pairs, the combination of inner and outer magnetic fields at any angle position is unique, thus achieving high-resolution absolute positioning. Similar to the "Gray code" in optical encoders.
Our company offers dual-code magnetic rings in multiple sizes for your selection.
Irregularly Magnetized Magnetic Rings
Non-regular magnetized magnetic rings are relatively less common in encoders, yet they offer unique advantages in specific applications, particularly where high resolution and specialized performance requirements are needed. Unlike conventional regular magnetized magnetic rings, the magnetic field distribution in non-regular magnetized rings does not follow standard symmetrical or regular layouts. This magnetization method can optimize encoder performance by altering the arrangement of magnetic poles.
The above covers the four types of magnetic rings used in magnetic encoders. For pricing or samples, please provide the dimensions, magnetic pole requirements, surface flux density, and other relevant specifications.
Magnetic products for related encoders;
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This is a very small rectangular ferrite block magnet, measuring 2.45 mm in length and 1 mm in both width and height. It is magnetised along its length and is barely noticeable when held in the hand....
7.4x6x5mm Ferrite Small Block Magnet Introduction，Material: Hard Ferrite (Ceramic)，Shape: Block / Rectangle / Bar，Coating: No Coating，Grade (Chinese Stardard): Y30，Operating temperature: -40°C to 250°C，Delivery time: 7-15 days，Magnetization direction: thickness....
U-shaped neodymium magnets are a type of high-performance permanent magnet material with a structure resembling the letter ‘U’. Manufactured from sintered neodymium-iron-boron, they are characterised by high magnetic energy product....
This is a radial 4-pole ring (Hollow cylinder) magnet, the material is bonded NdFeB, with high magnetic performance, the size is 16mm outer diameter, inner hole 5mm, height 20mm, surface gray epoxy treatment, suitable for water pump motor...
This product is a 4-pole ring magnet, injection-molded ferrite material, the sample size is 22mm outer diameter, 7mm inner diameter, 4mm thickness, 2 N poles and 2 S poles, mainly used for push rod motors, magnetic induction devices, encoders, etc.,...
This is a radial 2 pole circular magnet designed specifically for magnetic encoder chips. It is made of sintered neodymium-iron-boron with N35 grade performance and is suitable for standard environments....
This product is a multi pole magnetic ring with an inner diameter of 1.5mm. The material is injection molded ferrite. It adopts axial multi pole magnetization and is mainly used for DC motors. If you have a sample of similar injection molded magnetic products, please contact us for quotation....
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