Reenives:Global Leading Drone Motor Stacks Supplier
Motor Stacks: Precision Laminated Cores for UAV, Drone & High-Performance BLDC Motors
1. What are Motor Stacks? (The Laminated Core Foundation of Every BLDC Motor)
Motor stacks (also called lamination stacks or stator/rotor stacks) are precision-assembled bundles of thin silicon steel laminations that form the magnetic core of a brushless DC motor. A motor stack consists of stamped laminations stacked to a specific height and bonded or interlocked to maintain structural integrity. The quality of the motor stack directly determines magnetic flux density, eddy current losses, and thermal behavior .
Reenives manufactures high-quality motor stacks using non-grain oriented electrical steel (0.20mm/0.35mm) with advanced epoxy powder coating — achieving stacking factor ≥98.2% and reducing eddy current losses by up to 35% compared to conventional laminations .
2. Motor Stack Classifications
Reenives offers motor stacks in multiple configurations to meet diverse application requirements :
- By Stack Type: Stator stacks, rotor stacks, and matched stator-rotor sets.
- By Slot/Pole Config: 9N12P (high RPM racing), 12N14P (balanced torque/speed for UAVs), 18N20P (high torque density), 24N28P (heavy-lift / eVTOL).
- By Material Thickness: 0.20mm (high-frequency UAV/FPV) and 0.35mm (general industrial) .
- By Stacking Method: Interlocking self-bonding, laser welding, or epoxy bonding .
- By Insulation Coating: Epoxy powder coating (C5 grade, Class H, 180°C–200°C) with ≥1800V dielectric strength .
💡 Reenives specialty: private mould development for any custom motor stack geometry — optimized for your unique motor design .
3. Technical Specifications & Verified Performance Data
All parameters validated by Reenives R&D center (ISO 9001:2025 certified) and third-party testing per IEC 60404-2, SAE J2360, and ASTM A912. Critical for UAV, drone, and industrial motor designers .
| Parameter | Value / Range | Test Standard / Source |
|---|---|---|
| Lamination Thickness | 0.20mm / 0.27mm / 0.35mm (tolerance ±0.005mm) | Micrometer / SPC control |
| Core Loss @400Hz/1.0T (0.20mm) | ≤ 8.9 W/kg | Epstein frame (IEC 60404-2) |
| Core Loss @400Hz/1.0T (0.35mm) | ≤ 13.8 W/kg | Epstein frame (IEC 60404-2) |
| Saturation Flux Density B50 | 1.68T – 1.75T | Hysteresisgraph |
| Stacking Factor | ≥98.2% (interlocked) / ≥98.6% (bonded) | Weight / Dimension method |
| Epoxy Coating Dielectric | >1800V, Thermal Class H (180–200°C) | ASTM D149 / IEC 60085 |
| OD Range (Motor Stacks) | 18mm – 250mm | Reenives engineering capability |
📐 Data source: Reenives quality assurance lab, 2025–2026. Full batch traceability and test certificates available .
4. Applications – UAV, Drone & Industrial BLDC Motors
Reenives motor stacks power critical applications across multiple sectors :
- FPV Racing & Cinematic Drones: 2207, 2306, 2507 motor stacks with instant throttle response and reduced eddy current loss.
- Commercial UAVs & eVTOL: 12N14P / 18N20P motor stacks for 15-30kg payload with 92%+ peak efficiency.
- Electric Vehicle Traction Motors: 48V–800V motor stacks for e-bikes, e-scooters, and passenger EVs.
- Industrial BLDC Actuators: Robotic arms, servo drives, and medical equipment requiring smooth torque.
- Agricultural Spraying Drones: High-torque motor stacks with dust/water-resistant epoxy coating .
5. 5-Step Engineering Selection Guide for Motor Stacks
- Define motor outer diameter and stack length: Based on torque and power targets (e.g., 28mm OD for 5-inch FPV drone motor stack).
- Choose lamination material thickness: 0.20mm for high-frequency UAV (40-80kHz PWM) / 0.35mm for robust industrial BLDC motors .
- Select slot/pole combination: 9N12P for high RPM, 12N14P for balanced torque/speed, 18N20P for high torque density.
- Specify stacking method and insulation: Interlocking for high-volume production; epoxy bonding for lowest eddy loss; C5 epoxy coating for outdoor UAVs .
- Request samples and validation: Reenives delivers first-article inspection reports (FAI) and material certificates for PPAP within 7-10 days .
💡 Engineering support: Free DFM within 48h — send your motor spec or drawing to linda_reenives@163.com.
6. FAQ – Critical Motor Stack Technical Pain Points
Reenives recommends 0.20mm silicon steel (20WTG1300) for motor stacks operating above 30,000 RPM. Our test data confirms 8.9 W/kg core loss @400Hz/1.0T — reducing eddy current loss by 30-35% compared to 0.35mm laminations .
We guarantee stacking factor ≥ 98.2% for interlocked stacks and ≥98.6% for epoxy-bonded stacks. This directly increases magnetic flux density by ~6% compared to 96% stacking factor, improving torque density and motor efficiency .
Our C5 epoxy coating (40±5μm thickness) provides >1800V dielectric strength and thermal conductivity >0.85 W/m·K — 2x higher than standard C3 coatings. This reduces inter-lamination hotspot temperatures by 12-15°C during sustained hovering and passes 500h salt spray test per ASTM B117 .
Yes. We support private mould development for any custom motor stack geometry. Submit your 2D/3D drawing; MOQ from 500 pcs. Tooling lead time: 20 days; prototype samples: 7 days .
Prototype orders: as low as 50 pieces, lead time 10-12 days with 100% inspection. Private mould tooling: 15-20 days for mass production volumes. Global shipping with full export documentation (DDP/FCA/EXW) to US, EU, and Asia .
7. Summary & Call to Action – Power Your Next-Generation BLDC Motor
🚀 Ready to Optimize Your Motor Stacks?
Reenives delivers precision motor stacks with 0.20mm epoxy-coated steel, stacking factor ≥98.2%, and proven field performance. From UAV racing to EV traction, we are your strategic motor stack partner.
📦 Request Free Motor Stack Samples & 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 Drone Motor Stacks Supplier | UAV, Drone & Industrial 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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