Neodymium Arc Segment Magnets
Our Neodymium Arc Segment Magnets are precision-manufactured for BLDC motor rotors, offering high magnetic strength, reliable performance, and a secure fit. Available in custom sizes, grades, and magnetization directions to meet specific motor design requirements.
Neodymium Arc Magnets for BLDC Motor Rotors
A neodymium arc magnet in a BLDC rotor has one job: put a strong, even field across the air gap, pole after pole, for the life of the machine. The segments sit on the inside of the rotor can with their poles facing out, and nearly everything about them - radius, angle, count - is decided by the slot and pole combination of that motor. That is why we treat rotor arcs as a motor part first and a magnet second, and why we ask for the lamination drawing before we quote.
Precision Fit and Rotor Assembly
Fitting the rotor. A set of arcs has to close into a ring that leaves a clean, even air gap, so we grind each segment to the can and hold the radius to about ±0.1 mm, then match the set so no segment sits proud of its neighbours. Retention is adhesive under the arc, with a glass-fibre banding over it where surface speed calls for it, and the finished rotor goes back on the balancer after the magnets are on - a few tenths of a gram off centre at speed is a noise complaint waiting to happen.
High-Temperature Performance and Grade Selection
Surviving the winding. Magnets in a BLDC rotor never see ambient; they see winding heat, and on top of that the demagnetising field of stall current and peak load. An arc picked off a room-temperature datasheet gives up coercivity exactly when the motor is working hardest, so we choose from the NdFeB grades in the table below against the hot operating point - stepping up to an SH or EH grade is often the cheaper motor by the time you count warranty returns.
Magnetization Options and Custom Manufacturing
Charging and delivery. We can charge each arc segment on its own, or assemble the set and charge the ring multipole, whichever suits the winding, and we mark the poles on every segment so assembly cannot flip one. Send the lamination drawing, the working temperature and the duty cycle, and we will confirm grade, magnetising pattern and tolerance before quoting.
If your rotor needs a field that curves, a neodymium arc magnet is the part that delivers it - matched to the hot point of your motor rather than to the biggest number on a datasheet.
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