Multipole Radial Ring Magnets

Allstar Magnetics now offers high efficiency multipole magnetic rings. These Neodymium (NdFeB) rings are revolutionizing the permanent magnet space for synchronous motors, stepping motors and DC brushless motors widely used in automotive, computers, electronics, communications, office, school equipment and common household products. Until recently, full magnetic rings (FMR) were made of separate magnets joined together to create the desired ring shape. Now new technology enables the creation of super strong, one piece, multi-pole radial magnetic rings.

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Not recommended for use in rotary encoder applications (Click Here For Bonded Magnets)

The advantages are significant:

•  Motor assembly is made much easier, ie: installation of one or more rings versus gluing arcs into place
•  Radial sintering assures no “weak spots”
•  Magnets are multi-poled, thus the ring does not compromise the magnetic properties
•  The radial orientation results in a super strong magnet by virtue of superior metallurgy developed specifically to BE radially oriented


•    Actuators
•    Magnetic bearings
•    Magnetic clutch
•    Peripheral motors
•    Spindle motors
•    Steering control motors
•    Stepper motors
•    Other new products

Other Advantages:

•    Geometric precision
•    Variety of magnetic configurations
•    Homogeneous distribution of magnetic field
•    Design and assembly simplification
•    Precision of motor performances
•    Cost efficiency
•    Huge marketing potential



This process consists of combining nanocrystalline base powders, pressing the resulting material, and then baking or sintering the resulting ring to achieve a radially magnetized product. This new technology improves the magnetic flux which in turn provides better efficiency and performance.

Available Dimensions:

O.D I.D Wall Thickness(T) Height(H)
<70mm >15mm 2<T<5mm 25-50mm


*Special sizes may be produced depending on the grade, height-to-diameter ratio, and wall thickness.

Grade Remanence
Intrinsic Coercivity
Max Energy Product
Operating Temp.
N35R 11.7-12.2 ≥10.9 ≥12 33-36  (MGOe) 80
N38R 12.2-12.5 ≥11.3 ≥12 36-39  (MGOe) 80
N48R 13.8-14.2 ≥11.6 ≥12 46-49  (MGOe) 80
N35MR 11.7-12.2 ≥10.9 ≥14 33-36  (MGOe) 100
N38MR 12.2-12.5 ≥11.3 ≥14 36-39  (MGOe) 100
N45MR 13.2-13.8 ≥12.5 ≥14 43-46  (MGOe) 100
N35SHR 11.7-12.2 ≥11.0 ≥20 33-36  (MGOe) 150
N38SHR 12.2-12.5 ≥11.4 ≥20 36-39  (MGOe) 150
N42SHR 12.8-13.2 ≥12.4 ≥20 40-43  (MGOe) 150
N45SHR 13.2-13.8 ≥12.6 ≥20 43-46  (MGOe) 150
N33UHR 11.3-11.7 ≥10.7 ≥25 31-34  (MGOe) 180
N35UHR 11.8-12.2 ≥10.8 ≥25 33-36  (MGOe) 180

Radial Dual-Pole Cylindrical Magnet

High-Grade Radial Multi-Pole Ring