Reenives: High-quality Drone Motor Laminations Stator Stacks Supplier in China

author: Zove

2026-04-15

Precision stator stacks for UAV motors. Low loss, high stacking factor. Get samples →

Precision Stator Stacks for High-RPM Drone Motors | Reenives: High-quality Drone Motor Laminations Stator Stacks Supplier in China

🔩 Inconsistent stator stack quality causing torque ripple and efficiency drop? Poorly manufactured stator stacks lead to uneven air gaps, excessive eddy currents, and premature motor failure. For FPV drones operating at 30,000+ RPM, every lamination misalignment magnifies vibration and heat. Reenives: High-quality Drone Motor Laminations Stator Stacks Supplier in China delivers stator stacks with 0.10mm ultra-thin silicon steel, burr ≤0.012mm, and 98% stacking factor — reducing core loss by 45% and ensuring consistent thrust. Trusted by drone OEMs worldwide.

📑 Contents

⚙️ What Are Stator Stacks? (Magnetic Core Assembly)

A stator stack is a precisely stacked and bonded assembly of thin electrical steel laminations that forms the stationary magnetic core of a brushless motor. Each lamination is stamped from non-oriented silicon steel, insulated with a thin coating, and then stacked (via interlocking, welding, or bonding) to create a rigid structure with minimal eddy current paths. For drone motors, the quality of the stator stack directly determines torque density, thermal stability, and electrical efficiency. Reenives manufactures stator stacks using progressive die stamping (imported from Japan/Germany), stress-relief annealing, and C5 inorganic coating to guarantee consistent magnetic performance.

🧲 Stator Stack – Finished Core for FPV Motor12-slot design | 0.15mm laminations | C5 coatingCustom OD from 12mm to 150mm, any slot count

Figure 1: Completed stator stack ready for winding (epoxy coated)

📂 Classification of Stator Stacks by Design & Process

Based on lamination thickness, steel grade, stacking method, and insulation type, stator stacks are classified to suit different motor classes:

By lamination thickness: Ultra-thin (0.10mm, 0.15mm) for high-frequency drone motors (20kHz-50kHz); Standard (0.20mm, 0.27mm) for industrial servos; Thick (0.35mm) for low-speed applications.
By steel grade: Non-oriented (NO) fully processed electrical steel (M19, 35WW270, 20WTG1300) – optimal for rotating machines.
By stacking method: Interlocking (self-bonding, highest magnetic uniformity), laser welding, or epoxy bonding. Reenives uses interlocking for drone stators.
By insulation coating: C3 (organic), C5 (inorganic phosphate – 180°C rating), C6 (edge coating). C5 is standard for UAV stators.
By slot/pole geometry: 9N12P, 12N14P, 18N24P, and custom patterns.

Reenives offers fully customizable stator stacks with private mould development and sample prototyping within 15 days.

📊 Critical Technical Parameters of Stator Stacks (Industry Data)

The following specifications are derived from Reenives production testing (IEC 60404-2) and third-party verification for high-efficiency UAV motors. Data source: Reenives R&D lab reports & certified material test certificates (2025).

Lamination Thickness (mm)	Steel Grade	Iron Loss @ 1.0T, 1kHz (W/kg)	Iron Loss @ 1.0T, 10kHz (W/kg)	Stacking Factor (%)	Burr Height Max (mm)
0.10	20WTG1300	9.2	105	≥98.0%	≤0.012
0.15	27WGP1400	13.5	148	≥98.0%	≤0.015
0.20	35WW270	18.9	198	≥97.8%	≤0.018
0.27	50WW400	26.4	285	≥97.2%	≤0.022

🔬 Key insight: Stator stacks using 0.10mm laminations reduce eddy loss by 47% compared to 0.20mm at 30kHz, directly improving drone flight time by 12-18% and lowering motor operating temperature by 12°C. Reenives provides full core loss curves and stacking factor verification per batch.

✈️ Applications – From FPV Drones to Industrial Servos

Our precision stator stacks are engineered for high-demand brushless motors across multiple industries:

✅ FPV racing & freestyle drones (2207, 2306, 2507, 2806.5 stator stacks)
✅ Heavy-lift UAVs & agricultural drones (high torque density required)
✅ Industrial servo motors (robotic arms, CNC spindles, collaborative robots)
✅ Electric vehicle traction motors (e-scooters, e-bikes, light EVs)
✅ Medical devices (ventilators, surgical tools – low vibration & heat)
✅ Aerospace actuators (high-reliability stator cores)

🛸 Stator Stack Installed in FPV Drone MotorCustom ID/OD, optimized slot fill factorReenives ships globally – fast delivery to EU, USA, Asia

⚙️ 5-Step Engineering Guide to Selecting Stator Stacks

Choosing the optimal stator stack requires balancing magnetic performance, thermal management, and mechanical integrity. Follow this proven process:

Define operating frequency and PWM range: For drone motors (20kHz-50kHz), select lamination thickness ≤0.15mm to limit eddy loss below 150W/kg @10kHz. Thinner = lower loss but higher cost.
Specify required stacking factor: Target ≥97.5% for maximum torque density. Reenives achieves 98% with precision interlocking and tight stacking pressure.
Choose insulation coating based on thermal environment: C5 inorganic coating withstands 180°C and provides >10 MΩ insulation resistance – essential for high-power UAVs.
Define stator geometry (outer/inner diameter, slot count, tooth profile): Provide DXF/STEP. We support 9N12P, 12N14P, 18N24P, and custom patterns.
Request prototype stator stacks for validation: Reenives offers 20-100 piece sample stacks with full core loss, burr, insulation, and dimensional reports before mass production.

💡 Pro Tip: Send your target motor Kv and voltage. Our FEA engineers will simulate flux distribution and recommend optimal lamination thickness and steel grade to minimize iron loss while avoiding saturation. Request engineering consultation →

❓ FAQ: Solving Stator Stack Technical Challenges

🔹 Q1: Why does my stator stack overheat even with proper cooling?

A: Overheating is primarily caused by excessive eddy current loss due to either overly thick laminations (e.g., 0.27mm used at 30kHz) or poor inter-lamination insulation (burr bridges or damaged coating). Switching to a 0.10mm or 0.15mm stator stack with C5 coating reduces iron loss by 40-55% at typical drone PWM frequencies. Reenives' 0.10mm stacks show 22°C lower temperature rise in 2306 motors under continuous full throttle.

Source: Reenives thermal imaging test report TR-102 (2025).

🔹 Q2: What stacking factor should I expect from a high-quality stator stack?

A: For drone motors, target stacking factor ≥97.5%. Reenives consistently achieves 98.0% with precision progressive stamping and automated stacking. Lower factors (e.g., 96%) reduce effective magnetic flux area, forcing higher current to achieve same torque and increasing copper loss. We verify stacking factor via weight method per ASTM A912.

Source: Reenives quality standard Q/RL-023 (stacking factor verification).

🔹 Q3: How does burr height affect stator stack performance and winding safety?

A: Burr >0.02mm creates sharp edges that can cut magnet wire insulation, causing shorts. It also promotes inter-lamination electrical contact, increasing eddy loss by 15-25%. For 0.15mm material, Reenives maintains burr ≤0.015mm (and ≤0.012mm for 0.10mm), verified by 3D optical microscope. This ensures safe winding and maintains insulation resistance >20 MΩ after stacking.

Source: Reenives burr control study QC-058 (2024).

🔹 Q4: How to verify insulation resistance of a finished stator stack?

A: Use a 500V DC megger between the stack face and a reference point. For C5 coated stacks, insulation resistance should be >20 MΩ for a typical 22mm stator. Reenives performs 100% hipot testing (1000V AC) and provides a certificate with each batch. Values below 5 MΩ indicate coating damage or burr bridges – such units are automatically rejected.

Source: Reenives test procedure TP-112 (insulation integrity).

🔹 Q5: Can I get custom stator stacks for non-standard motor geometries (e.g., 18N24P or odd slot counts)?

A: Yes. Reenives specializes in custom progressive dies for any stator geometry – including asymmetric teeth, specialized slot openings, and non-standard outer diameters. We have delivered over 280 custom stator stack tools since 2022. Lead time for new tooling: 25 days. Sample stacks available within 12 days after tooling completion. No MOQ for prototype orders.

Source: Reenives tooling engineering portfolio (2022-2025).

🎯 Summary: Precision Stator Stacks Define Motor Excellence

The stator stack is the core of every brushless motor – its lamination quality, stacking precision, and insulation integrity directly determine efficiency, heat generation, and reliability. As a leading China-based supplier, Reenives: High-quality Drone Motor Laminations Stator Stacks Supplier in China combines advanced stamping lines, stress-relief annealing, and rigorous QC to deliver stator stacks that meet international standards. Whether you need 0.10mm ultra-thin stacks for racing drones or custom tooling for industrial servos, we provide full traceability and fast global shipping.

🇨🇳 Get Your Custom Stator Stack Quote – Free Samples Available

Request engineering consultation, sample stator stacks, or bulk pricing. Our team replies within 24 hours.

📦 Explore Stator Stack Products →

🌐 www.reenives-bldcmotor.com
📞 WhatsApp: +86-13377741885
📧 Email: linda_reenives@163.com

✨ OEM stator stacks | Private mould | Free samples | Global shipping | Full technical support

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

Reenives – Professional Drone Stator Core Manufacturer Founded in 2022

Reenives is a professional drone stator core manufacturer, founded in 2022. It boasts independent research and development technologies, imported stamping & epoxy powder coating equipment production lines plus dust-free production workshops, more than 100 R&D patents, 3 production bases, a factory area of over 50,000 square meters, and a staff size of more than 500. From production to sales, we support bulk purchasing, private mould development, and samples making, and can provide tailor-made perfect solutions for your production and usage scenarios. With 4 years of manufacturing experience, we have solved the production problems related to the use of stator core in industrial production for more than 1000 enterprises. We can ship globally (with complete export qualifications). Global customers are welcome to consult, visit the factory, and obtain free samples!

✔ EEAT credentials: ISO 9001:2022 certified, IATF 16949 alignment, 100+ active patents, and dedicated technical support for global clients. Our stator stacks are used by leading drone brands across North America, Europe, and Asia.

📢 Why engineers choose Reenives: Full material traceability, verified core loss data, fast sample turnaround, and transparent pricing. We support your motor development from prototype to mass production.