Ultra-Low Loss Silicon Steel Laminations for FPV UAV Brushless Motors | High-Frequency Stator Cores

🔍 What Are Silicon Steel Laminations? (Stator Core Basics)

Silicon steel (electrical steel) contains 1.5–3.5% silicon, which increases electrical resistivity and drastically reduces eddy current loss. In brushless motors, stator cores are stacked from thin silicon steel laminations to minimize magnetic hysteresis and heat generation. For FPV drones operating at 20,000–60,000 RPM, the right lamination thickness (0.1mm–0.2mm) is critical to maintain torque density without saturation.

📂 Classification of Silicon Steel for Brushless Motors

Based on grain orientation, thickness, and coating, silicon steel laminations fall into these categories:

• By thickness: 0.10mm, 0.15mm, 0.20mm, 0.27mm, 0.35mm (thinner = lower eddy loss, ideal for >1kHz motors).
• By grain orientation: Non-oriented (NO) for rotating machines (most drone motors); oriented (GO) for transformers.
• By insulation coating: C3 (organic), C5 (inorganic phosphate + chromate), C6 (high edge insulation) – critical for inter-lamination resistance.
• By grade (IEEE/AISI): M19, M27, M36, 35WW270, 50WW600, 20WTG1500 (high-frequency grades).

Reenives supplies non-oriented ultra-thin grades down to 0.10mm, specially developed for FPV drone motors and high-speed spindles.

📊 Key Technical Parameters (Industry Data)

Below are typical values for high-grade silicon steel laminations optimized for UAV brushless motors. Data source: Reenives R&D lab (ASTM A677 / IEC 60404-2) and third-party verification.

Note: For FPV racing drones operating at >40kHz PWM frequency, we recommend 0.10mm ultra-thin laminations to keep core loss under control. Reenives provides full material certificates & core loss curves on request.

✈️ Applications – Beyond FPV UAV Motors

While optimized for FPV drone brushless motors, our silicon steel laminations serve diverse industries:

• ✅ High-performance racing & cinematic drone motors (2207, 2306, 2806 sizes)
• ✅ Industrial servomotors & collaborative robots
• ✅ Electric vehicle auxiliary motors & e-scooter hub motors
• ✅ Medical centrifuges & high-speed spindles
• ✅ Aerospace actuators (high-reliability stators)

⚙️ Step-by-Step Selection Guide for Engineers & Purchasers

Choosing the right silicon steel lamination impacts motor efficiency, torque ripple, and thermal management. Follow these 5 steps:

1. Determine operating frequency: For drone motors (10kHz–50kHz PWM), select ≤0.15mm thickness to reduce eddy current loss.
2. Check core loss budget: If your motor exceeds 85°C under load, downgrade thickness to 0.10mm with high-resistivity coating.
3. Evaluate stacking factor: High-quality stamping ensures >97% factor; Reenives achieves 98% with progressive dies.
4. Select insulation coating: C5 coating (inorganic) offers superior heat resistance for high-temp environments.
5. Request prototyping samples: Reenives supports private mould development & 100-piece pilot runs before mass production.

Pro tip: Combine our finite-element analysis (FEA) support to optimize stator slot design and reduce torque cogging. Contact our engineering team →

❓ FAQ: Solving Stator Core Technical Pain Points

🎯 Summary: Maximize Motor Performance with Premium Silicon Steel

Choosing the right silicon steel laminations directly determines your UAV motor's power density, thermal stability, and lifecycle. As a dedicated partner, Reenives: Leading FPV UAV Drone Silicon Steel Laminations Manufacturer in China bridges the gap between material science and practical engineering — offering ultra-thin gauges, certified low core loss, and rapid prototyping. From 0.10mm ultra-thin strips to custom epoxy powder coating, we provide one-stop stator solutions for OEMs and aftermarket brands.

🏭 About the Manufacturer – Dongguan Runlu Motor Technology Co., Ltd.