Injection molded SmFeN multipole rings for compact actuators, micro motors, and precision position-control mechanisms.
SmFeN Multipole Rings for Micro Actuators is most relevant when best for actuator teams that need higher output than ferrite but want a molded ring geometry with reliable pole repeatability. Typical solution programs include Micro actuators, Compact stepper motors, and Servo feedback rings, so the early review should confirm pole count, phase alignment, and pole-pitch tolerance for small ring diameters.
Before sample tooling, align on 2D/3D drawing, material target, magnetic pattern, and sensing datum and operating temperature, vibration, media exposure, and lifetime requirement. The first acceptance check is pole pitch control (Defined by actuator resolution and ring diameter), because small actuators magnify pole pitch and concentricity errors into torque ripple or position jitter.
The main risk is brittle sintered magnet carried into a vibration-critical assembly; control it by review bonded magnet material and molded geometry when chipping, cracking, or adhesive failure can affect functional safety. Also review rotor balance and runout and magnetic pattern accepted without measurable criteria before moving from prototypes to repeat production.
| Evaluation Metric | Typical Range | Buyer Relevance |
|---|---|---|
| Pole pitch control | Defined by actuator resolution and ring diameter | Small actuators magnify pole pitch and concentricity errors into torque ripple or position jitter. |
| Rotor balance and runout | Project-defined by speed, bearing layout, and air gap | A molded ring must satisfy both magnetic and mechanical release criteria. |
Ferrite is often the cost baseline. SmFeN is reviewed when the actuator needs more magnetic output or demagnetization margin inside the same package.
Include 2D/3D drawing, material target, magnetic pattern, and sensing datum, operating temperature, vibration, media exposure, and lifetime requirement, and sample quantity, tooling target, annual forecast, destination, and PPAP needs. If the part is tied to automotive or safety-critical sensing, also include PPAP, traceability, and magnetic test expectations.
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Include drawing, material, pole pattern, temperature, compliance, and PPAP needs.
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