Multi-pole Permanent Magnets

Multi-pole radially oriented permanent magnets are typically used in the production of electric drives. Compared to the assembly of traditional segments, the cost saving in the course of assembly occurs especially in lager production series. We supply multi-pole magnets made of several different types of material. The two basic groups comprise sintered NdFeB magnets and plastic bonded magnets (plasto-magnets). Based on your idea of the magnetic and mechanical properties of the material, we will give you advice for the right choice, please contact us.

Multi-pole Permanent Magnets

Multi-pole Permanent Magnets

HangSeng Magnetech Inc. now offers high efficiency multipole magnetic rings. Multipolar sintered neodymium ring magnet is one of our most recent product developments, for which we developed specific raw material and production methods. This ring magnet is meant to replace the commonly used segment magnets, e.g. for application in the drive technology sector.

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.

The advantages are significant:
The cylindrical shape allows smaller mechanical tolerance compared to segment magnets
Motor assembly is made much easier; installation of one or more rings versus gluing arcs into place.
Currently attainable qualities: 35H, 40H, 45H, 38M, 35SH, 38SH, 42SH, 35UH, 40UH
Radial sintering may prevent so-called „weak spots”500×336
Homogeneous flux of the poles
Uniformity of the magnetic field is significantly better than that of segment magnets
Magnets are multi-poled – thus the ring does not compromise the magnetic properties
Ring magnets offer substantial cost savings on assembling the rotor
No additional rings or protecting cases are required for fixation
Different types of magnetization are possible: diametrical, multipolar as well asso called “skewed” magnetization
This ring provides high cost-effectiveness as well as better motor performance (as compared to the usual segment magnets)
The radial orientation results in a super strong magnet by virtue of superior metallurgy developed specifically to BE radially oriented.

Hot pressing is a new method of producing sintered NdFeB magnets. This process consists of combining base powders, hot 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.

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