The 10mm diameter envelope is the boundary between ultra-miniature and standard micro motors. Use this page to calculate feasibility for your load, understand thermal limits, and validate your specification before prototyping.
Enter your application parameters and click calculate to see the engineering feasibility for a 10mm motor.
The 10mm OD leaves roughly ~8mm for the stator and rotor. This physically limits the copper fill factor, capping continuous torque around 0.5 - 1.2 mNm for standard models, with premium designs reaching ~1.68 mNm (e.g., Faulhaber 1028).
Surface area is minimal (~300mm²). Without active cooling or a solid metallic mount, heat dissipation is the primary failure mode (thermal resistance housing-ambient Rth2 ~ 20-35 K/W). Power dissipation must stay below 1.5W-2W.
Integrating Hall sensors into a 10mm housing requires micro-PCB techniques, significantly limiting internal volume. Sensorless FOC or block commutation is highly recommended for maximum power density.
Understanding the true limits of a 10mm coreless BLDC is critical to preventing thermal overload and premature bearing failure. Below is the typical safe operating zone based on industry benchmarks (e.g., Maxon EC 10, Portescap 10ECS, Faulhaber 1028).
Continuous Zone: Sustained operation without overheating. Speeds up to ~50,000 RPM, torque < 1.5 mNm. Requires proper ambient cooling.
Intermittent Zone: High torque needed for acceleration or short bursts (under 1-2 seconds). Risk of winding damage if sustained.
High-Speed Limit: Exceeding 75,000 RPM introduces severe dynamic balancing issues and exponentially reduces ball bearing lifespan.
*Boundaries are estimates for standard 2-pole slotless/coreless BLDC motors in 10mm OD, assuming 25°C ambient without extra heatsinks.
The following table outlines the physical and electrical limits of the 10mm form factor, constrained by physics (copper volume, magnetic flux, thermal dissipation) rather than manufacturing capability.
| Parameter | Typical Limit | Engineering Constraint |
|---|---|---|
| Diameter | 10.0 mm (±0.05) | Strict OD tolerance required for press-fit assembly into precision housings. |
| Length (Body) | 15 mm - 28 mm | Longer bodies (e.g. 28mm) increase torque linearly but risk rotor resonance (whirl) at high speeds. |
| Max Continuous Torque | 0.8 - 1.68 mNm | Limited by wire gauge and winding resistance (I²R losses). Exceeding this burns the coil. |
| Max Speed | 50,000 - 100,000 RPM | Limited by bearing life (NSK/NMB micro ball bearings) and dynamic balancing of the 2-pole magnet. |
| Weight | 6g - 13g | Highly suitable for airborne (UAV) or wearable mass-budgets, minimizing inertia. |
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深圳磁原动力科技有限公司
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