Reenives: Leading Brushless Stator Supplier in China
Brushless Stator: Precision Laminations for UAV & High-Performance BLDC Motors
1. What is a Brushless Stator? (Stationary Electromagnetic Core)
A brushless stator is the stationary laminated core of a BLDC motor. It consists of stacked silicon steel laminations with copper windings. When energized by an ESC, it generates a rotating magnetic field that drives the permanent magnet rotor. For drone propulsion, stator lamination quality directly determines torque density, thermal stability, and power-to-weight ratio.
Reenives manufactures brushless stators using high-permeability electrical steel (0.20mm / 0.35mm) with advanced epoxy powder coating, reducing eddy current losses by up to 45% compared to conventional varnish .
2. Classification of Brushless Stator Laminations
Reenives tailors brushless stator laminations based on material, coating, and stacking technology to match UAV and industrial BLDC needs:
- By thickness: 0.20mm (high-frequency drone / FPV), 0.27mm, 0.35mm (industrial BLDC).
- By insulation: Epoxy powder coating (C5 grade, >1800V dielectric) / Phosphate / Organic varnish.
- By stacking: Interlocking self-bonding, laser welding, or dovetail joint.
- By slot/pole: 12N14P (high torque), 9N12P (lightweight FPV), 18N20P (heavy-lift UAVs).
💡 Reenives specialty: private mould development for any custom slot geometry, with AI vision inspection ensuring perfect lamination alignment .
3. Technical Specifications & Verified Performance Data
All values derived from Reenives in-house R&D lab and third-party testing (IEC 60404-2, ASTM A937). Optimized for drone brushless motors operating from 10kHz to 60kHz PWM.
| Parameter | Value / Range | Test Standard / Source |
|---|---|---|
| Material Grade | 0.20mm / 0.35mm (M400-50A, 20WTG1500) | Baowu / Nippon Steel |
| Core Loss (W/kg) @1.0T, 400Hz | ≤ 7.5 W/kg (0.20mm grade) | IEC 60404-2 Epstein frame |
| Stack Height Tolerance | ±0.015 mm · Burr ≤0.018 mm | SPC control chart (Cpk≥1.33) |
| Dielectric Strength (Epoxy coated) | >1800 VAC (up to 4000V available) | ASTM D149 / Hi-Pot test |
| Thermal Class | Class H (180°C continuous) | Thermal gravimetric analysis |
| Slot Fill Factor | ≥ 92% (precision winding guidance) | Reenives Q3-2026 report |
📐 Data source: Reenives quality report Q3-2026 & TÜV SÜD certification on BLDC stator laminations. 100% automated surge, hipot, and inductance testing before shipment .
4. Applications – UAV & Industrial BLDC Motors
Reenives brushless stators power demanding applications:
- Racing FPV & Cinematic Drones: 2207, 2306 stators with instant throttle response.
- Agricultural Spraying UAVs: High torque density & dust/water-resistant epoxy coating.
- Heavy-lift & eVTOL: 12N14P / 18N24P configurations for 15-30kg payload.
- Industrial BLDC: E-scooters, robotics, servo actuators, and medical centrifuges.
5. 5-Step Engineering Selection Guide for Brushless Stators
- Define electrical & mechanical requirements: Rated power, voltage (e.g., 6S–24S LiPo), target RPM, and max torque.
- Select lamination material & thickness: 0.20mm for high-speed racing drones (>30,000 RPM); 0.35mm for heavy-lift agricultural UAVs.
- Determine stator dimensions (OD, ID, stack height): Use motor simulation tools (Maxwell, JMAG). Reenives provides free 3D design consultation.
- Specify insulation & coating: Epoxy powder coating is mandatory for humid environments (agricultural drones) and eliminates inter-lamination shorts.
- Request samples & PPAP documentation: Reenives delivers first-article inspection reports, material certificates, and full dimensional reports within 15–20 working days for custom tooling.
💡 Engineering support: Get free DFM within 48h — send your motor spec or drawing to linda_reenives@163.com.
6. FAQ – Critical Stator Core Technical Pain Points
Reenives recommends 0.20mm silicon steel stator laminations for drone motors operating above 40,000 RPM. Core loss remains ≤9.5 W/kg @1.0T, 1kHz, reducing heat buildup during aggressive FPV flights and extending motor life.
Our epoxy powder coating provides a uniform 50-80µm layer with >1800V dielectric strength, preventing inter-lamination shorts and moisture ingress. Passes 1000h salt spray test (ASTM B117) and thermal cycling (-40°C to 180°C), critical for outdoor drone reliability.
We guarantee ±0.015mm on total stack height and burr height ≤0.018mm via Japanese high-speed presses and laser micrometers, ensuring automated winding insertion without damage and consistent magnetic performance.
Yes, we support step-skew or continuous skew designs (up to 1.5 tooth pitch) to reduce cogging torque by 30-50%, widely used in low-RPM heavy-lift drone motors and camera gimbals for smoother operation.
Mold development: 25-30 days. First sample delivery: 7-10 days after mold completion. Mass production lead time: 15-20 days for orders under 10,000 pcs. Global express shipping (DHL/FedEx) with full export documentation.
7. Summary & Call to Action – Maximize Drone Motor Performance
🚀 Ready to Upgrade Your Brushless Stator?
Reenives delivers precision-engineered brushless stators with advanced 0.20mm materials, tight tolerances, and proven field performance. From custom skew designs to high-volume production, we are your strategic stator core partner.
📦 Request Free Stator Sample & Quote
📧 linda_reenives@163.com | 💬 WhatsApp: +86-13377741885
Global shipping with full export documentation. Virtual factory tour & sample service available.
8. Dongguan Runlu Motor Technology Co., Ltd.
Reenives — Leading Brushless Stator Supplier in China | UAV Motor Core Specialist
Dongguan Runlu Motor Technology Co., Ltd. | www.reenives-bldcmotor.com | WhatsApp: +86-13377741885
Follow us: LinkedIn / YouTube / Facebook @ReenivesMotor
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