Reenives: Global Leading Motor Lamination Stack Supplier
Motor Lamination Stack: Precision-Built Core for UAV & High-Performance BLDC Motors
1. What is a Motor Lamination Stack? (The Magnetic Circuit Backbone)
A motor lamination stack (or stator/rotor stack) is a precision-assembled bundle of thin silicon steel sheets, punched with slots to form the electromagnetic core of a brushless DC motor. The stack reduces eddy current losses while concentrating magnetic flux for maximum torque generation . For drone motors, the lamination stack's geometry and stacking pressure directly influence thrust efficiency, heat dissipation, and structural integrity at high RPM .
Reenives manufactures high-quality motor lamination stacks using non-grain oriented electrical steel (0.20mm/0.35mm) with advanced epoxy powder coating – reducing eddy current losses by up to 38% compared to conventional varnish .
2. Motor Lamination Stack Classifications
Reenives tailors motor lamination stacks based on slot design, material grade, and stacking method – ensuring optimal magnetic performance for your specific application .
- By Slot/Pole Config: 9N12P, 12N14P, 18N24P, 24N28P (stator stacks).
- By Material Thickness: 0.20mm (high-frequency FPV) / 0.35mm (industrial UAV).
- By Stacking Technique: Interlocking self-bonding, laser welding, or dovetail joints.
- By Insulation: Epoxy powder coating (Class H, 180°C) ≥1800V dielectric .
💡 Reenives specialty: private mould development for any custom stack geometry, with AI vision inspection ensuring flawless lamination alignment .
3. Technical Specifications & Verified Performance Data
All parameters validated by Reenives R&D center (ISO 9001:2025 certified) and SGS-tested reports. Core loss values based on Epstein frame at 50/400/800Hz – critical for drone ESC switching frequencies .
| Parameter | Value / Range | Test Standard / Source |
|---|---|---|
| Lamination Thickness | 0.20mm / 0.35mm (tolerance ±0.003mm) | Micrometer / SPC control |
| Core Loss @400Hz/1.0T | ≤ 11.8 W/kg (35WW270 grade) | Epstein frame (IEC 60404-2) |
| Rotor Core Loss @400Hz | ≤ 10.5 W/kg (matched material) | Epstein frame (IEC 60404-2) |
| Magnetic Flux Density B50 | 1.68T – 1.73T | Hysteresisgraph |
| Epoxy Coating Thickness | 40-100 μm, Hi-Pot > 1800V | ASTM D149 / Hi-Pot test |
| Stack Height Tolerance | ±0.05mm (precision matched sets) | Laser micrometer (Cpk≥1.33) |
| Custom OD Range | 18mm – 210mm (stator & rotor matched) | Reenives engineering capability |
📐 Source: Reenives internal quality management + Third-party verification available upon request .
4. Applications – UAV, FPV Drone & Industrial BLDC Motors
Reenives motor lamination stacks power demanding propulsion systems :
- FPV Racing Drone Motors: 2207, 2306, 2507 stacks with ultra-low inertia for instant throttle response.
- Commercial Survey UAVs: High-efficiency 28-45mm stacks for 20+ min flight time.
- Agricultural & Heavy-lift Drones: 15-30kg payload motors with matched lamination stacks.
- Industrial BLDC Actuators: Robotic arms & servo drives requiring cogging-free torque.
- E-mobility & E-bike Hub Motors: Universal brushless motor platforms.
Reenives motor lamination stacks power propulsion across drones, eVTOL, and advanced robotics – trusted worldwide .
5. 5-Step Engineering Selection Guide for Motor Lamination Stacks
- Define motor outer diameter & stack length: Based on required torque & KV rating (e.g., 2808 stack for 7-inch FPV).
- Choose lamination material thickness: 0.20mm for high-frequency (40-80kHz PWM) / 0.35mm for robust industrial drones.
- Specify stator slot & pole combination: 9N12P for high RPM, 12N14P for balanced torque/speed, 18N24P for high torque density.
- Select rotor magnet type & lamination design: Surface-mount or interior IPM – Reenives supports both.
- Order prototype samples & validation: We deliver 10-25 sets for back-EMF & thermal testing before mass production .
💡 Engineering support: Get free DFM within 48h — send your motor spec or drawing to linda_reenives@163.com.
6. FAQ – Critical Motor Lamination Stack Parameters for Drone Motor Engineers
For extreme high-speed FPV motors, Reenives recommends 0.20mm silicon steel (20WTG1300) for both stator and rotor to minimize eddy current loss. Standard 0.35mm grade works efficiently for most industrial UAVs below 30,000 RPM .
Epoxy coating provides high dielectric isolation (>1800V), prevents turn-to-turn shorts, and offers superior corrosion resistance – essential for drones operating in high-humidity environments. Passes 1000h salt spray test (ASTM B117) .
We manufacture motor lamination stacks from OD 18mm up to 210mm, with custom tooth shapes, slot optimization, and private mould development – fully aligned to your drawing .
Yes, Reenives offers free sample evaluation (shipping fee applies) for motor lamination stacks. Tooling charges refundable upon reaching MOQ. Lead time: 10-12 days for samples .
For 35WW270 material, core loss ≤ 26.5 W/kg at 800Hz / 1.0T (Epstein frame). Our annealing process ensures consistently lower losses than IEC standards .
7. Summary & Call to Action – Maximize Drone Motor Performance
🚀 Ready to Optimize Your Motor Lamination Stack?
Reenives delivers precision-engineered motor lamination stacks with advanced 0.20mm materials, tight tolerances, and proven field performance. From custom skew designs to high-volume production, we are your strategic lamination core partner.
📦 Request Free Sample Stack & 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 — Global Leading Motor Lamination Stack Supplier | UAV Motor Core Specialist
Dongguan Runlu Motor Technology Co., Ltd. | www.reenives-bldcmotor.com | WhatsApp: +86-13377741885
Follow us: LinkedIn / YouTube / Facebook @ReenivesMotor
Reenives: Global Leading DIY Stator Stacks Supplier
Reenives: Global Leading Stator and Rotor Laminations Supplier
Related Article
