Special shaped sintered NdFeB magnets are used in Hall effect position sensors. These special shaped sintered NdFeB magnets are often square or rectangular with a central hole. The tolerance of special shaped sintered NdFeB magnets for sensors is ±0.05 mm.
A 5x5x2.5 mm special shaped sintered NdFeB magnet suits a small rotary encoder. The magnetization direction of special shaped sintered NdFeB magnets can be axial, diametral, or multi‑pole. Special shaped sintered NdFeB magnets with a through hole accept a plastic insert.
The temperature coefficient of special shaped sintered NdFeB magnets is ‑0.11%/°C for Br. Special shaped sintered NdFeB magnets for medical sensors have a parylene coating. The surface roughness of special shaped sintered NdFeB magnets is Ra 0.8 µm.
Special shaped sintered NdFeB magnets with a countersunk screw mount are easy to install. A ring‑shaped special shaped sintered NdFeB magnet is used in torque sensors. The magnetic flux density of special shaped sintered NdFeB magnets is measured with a Helmholtz coil.
Special shaped sintered NdFeB magnets with a step profile fit into plastic housings. The irreversible loss of special shaped sintered NdFeB magnets under 150°C is less than 5%. Special shaped sintered NdFeB magnets for automotive sensors must pass thermal cycling.
A 0.5 mm thick special shaped sintered NdFeB magnet is used in a miniature switch. The corrosion resistance of special shaped sintered NdFeB magnets is tested in a 48‑hour salt spray. Special shaped sintered NdFeB magnets with a black epoxy coating blend with dark housings.
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