Sensor, motor and encoder magnets are the small precision parts inside an assembly, where a small change in position or field changes the output. We hold the working face to ±0.02 mm, magnetise in the direction your circuit needs, and check the field on every batch. Start from the three groups below.
Application-Specific Magnets
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Sensor Magnets
Sensor magnets sit in front of a Hall or reed element and switch a circuit when…
View Sensor Magnets →Motor Magnets
Motor magnets provide the field that a rotor or stator turns against. Pole arc, skew and…
View Motor Magnets →Encoder Magnets
Encoder magnets give a position sensor a field that changes predictably as the shaft turns. Pole…
View Encoder Magnets →Which One Do You Need?
Most parts in this section fall into one of three groups. The group decides which measurements matter. It does not change the material, because all three use sintered NdFeB or SmCo.
| Where the part sits | Group | What decides the design |
|---|---|---|
| Opposite a Hall or magnetoresistive sensor | Sensor Magnets | Field uniformity across the air gap, drift with temperature, dimensional tolerance at the gap, margin against demagnetization |
| In a rotor or a stator, making torque | Motor Magnets | Grade against the working temperature at the magnet, margin against demagnetization, coating for the environment |
| At the shaft end, feeding an encoder IC | Encoder Magnets | Pole count, pole pitch, magnetization uniformity, eccentricity and runout |
Two of them often apply at once. A motor magnet and a sensor magnet can share the same housing, and each one shifts the field the other sees. Tell us both and we will look at them together.
If the group is not obvious from your drawing, send the drawing. We will tell you where the part falls and what we can hold on it.
What We Hold on a Drawing
Where a dimension sets the air gap or the sensing distance, we work to ±0.02 mm, and to ±0.01 mm on the critical ones. Other dimensions follow the drawing. Send it and we come back with the tolerance band that fits your assembly, before you commit to an order.
On multipole parts we also measure three things that a standard dimensional report leaves out: pole count, pole-to-pole phase deviation and peak variation. Ask for them by name if your sensor or encoder IC is sensitive to them. We measure them on every batch, and the reading ships with the parts.
Coating thickness, coating adhesion and magnetization direction are confirmed the same way. Where the specification is not settled yet, we send both sides of the data and wait for your confirmation before production starts.
What to Send
Four things get you a quote: the drawing, the working temperature at the magnet, the magnetization direction or pole count, and the quantity. If a drawing is not ready yet, the temperature and a target size are enough to start.