Special shaped sintered NdFeB magnets are critical for high‑performance electric motor rotors. These special shaped sintered NdFeB magnets are cut into arcs or trapezoids to fit curved surfaces. The magnetic orientation of special shaped sintered NdFeB magnets is aligned during pressing.
A typical special shaped sintered NdFeB magnet for a brushless motor has a 45‑degree arc. The grade N42SH of special shaped sintered NdFeB magnets operates up to 150°C. Special shaped sintered NdFeB magnets with countersunk holes are used for through‑bolting.
The coating on special shaped sintered NdFeB magnets is often nickel‑copper‑nickel for corrosion resistance. Special shaped sintered NdFeB magnets with a step feature allow self‑alignment in housings. The coercivity of special shaped sintered NdFeB magnets must exceed 20 kOe for automotive use.
For servo motors, special shaped sintered NdFeB magnets are magnetized in a sinusoidal pattern. Special shaped sintered NdFeB magnets with a beveled edge reduce cogging torque. The density of special shaped sintered NdFeB magnets is 7.6 g/cm³, about 20% lighter than SmCo.
Special shaped sintered NdFeB magnets for aerospace are tested for outgassing. The pull force of special shaped sintered NdFeB magnets varies with air gap length. Many EV manufacturers design their own special shaped sintered NdFeB magnets in‑house.
A 1‑inch long special shaped sintered NdFeB magnet can generate 400 lbs of holding force. The recoil permeability of special shaped sintered NdFeB magnets is close to that of air. Special shaped sintered NdFeB magnets with a magnetic bias layer improve field shape.
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