Global Leading BLDC Outrunner Drone Motor Rotor and Stator Core Supplier
Motor Rotor and Stator – Matched Cores for BLDC Outrunner Drone Propulsion Systems
Drone motor performance limited by mismatched rotor and stator cores? Need a global partner for outrunner propulsion solutions? The motor rotor and stator are the two fundamental magnetic components of every BLDC outrunner motor—working together to convert electrical energy into mechanical thrust. As a global leading BLDC outrunner drone motor rotor and stator core supplier, Reenives delivers precision-matched lamination sets with 0.2mm ultra-thin silicon steel, 12N14P or 24N22P configurations, burr height < 0.03mm, and epoxy coating—reducing core loss by up to 30%, optimizing the air gap for maximum torque density, and delivering reliable, efficient propulsion for UAV, FPV, and eVTOL applications worldwide.
- • What Are Motor Rotor and Stator Cores?
- • Classification of Outrunner Rotor & Stator Cores
- • Technical Specifications & Verified Data
- • Applications: FPV Racing, UAV Logistics, eVTOL & More
- • 6-Step Engineering Selection Guide for Outrunner Motor Cores
- • FAQ: Motor Rotor & Stator Core Technical Questions
- • Why Reenives – Global Leading BLDC Outrunner Drone Motor Rotor and Stator Core Supplier
- • Dongguan Runlu Motor Technology Co., Ltd.
What Are Motor Rotor and Stator Cores?
Motor rotor and stator cores are the precision-laminated silicon steel components that form the two magnetic cores of every BLDC outrunner motor. The stator core is the stationary laminated stack with teeth that receive copper windings, generating the rotating magnetic field. The rotor core is the rotating laminated stack that carries permanent magnets and follows the stator's field to produce torque .
Why matched rotor-stator cores are critical for outrunner drone motors:
- Optimized air gap – Precision-matched components ensure consistent air gap for maximum magnetic coupling
- Eddy current reduction – Thin laminations (0.15–0.20mm) minimize core loss in both rotor and stator
- Torque density – Matched magnetic circuits maximize torque output per unit weight
- Reduced cogging – Precision geometry ensures smooth rotation and minimal cogging torque
- Outrunner configuration – The rotor spins on the outside of the stator, delivering high torque for direct-drive propellers
ⓘ Outrunner motor insight: "A perfectly matched rotor and stator core set is the foundation of every high-efficiency outrunner motor. The precision of the magnetic circuit determines torque density, thermal stability, and overall flight performance."
Reenives manufactures precision-matched rotor and stator cores for BLDC outrunner drone motors using imported 0.2mm silicon steel, progressive stamping dies, and automated epoxy powder coating—delivering optimal magnetic performance for demanding UAV, FPV, and eVTOL applications .
Classification of Outrunner Rotor & Stator Cores
Reenives supplies matched rotor and stator cores across four primary series, tailored to different drone classes and performance requirements :
| Series | Stator OD (mm) | Slot/Pole Configuration | Lamination Thickness | Best For |
|---|---|---|---|---|
| Series A – Micro FPV | 12–20mm | 9N12P | 0.15–0.20mm | Micro drones, tiny whoops, sub-100g FPV |
| Series B – FPV Racing | 22–30mm | 9N12P, 12N14P | 0.15–0.20mm | 3–5 inch FPV racing drones, freestyle |
| Series C – Mid-Size UAV | 30–50mm | 12N14P, 24N22P | 0.20mm | Logistics drones, camera platforms, agriculture |
| Series D – Heavy-Lift & eVTOL | 50–80mm | 24N22P, 36N30P | 0.20mm | Heavy-lift UAVs, eVTOL, cargo drones |
Matched rotor and stator cores are optimized for specific outrunner applications:
- 12N14P: Near-perfect winding factor (0.933), low cogging—most popular for outrunner UAV motors
- 9N12P: High RPM, responsive throttle—ideal for FPV racing outrunners
- 24N22P: High torque, low cogging—logistics and agriculture UAVs
- 36N30P: Maximum torque density—eVTOL and heavy-lift outrunners
Technical Specifications & Verified Data
All performance data below is derived from Reenives in-house laboratory testing (IEC 60404-2), third-party validation, and industry standards for outrunner motor rotor and stator cores .
| Parameter | Value / Range (Reenives Standard) | Test Standard / Source |
|---|---|---|
| Stator Outer Diameter | 12–80mm (customizable) | CMM / optical comparator |
| Rotor Outer Diameter | Matched to stator design | CMM / optical comparator |
| Material Type | Silicon steel (CRNGO / Non-oriented) | Material certificates / IEC 60404 |
| Common Grades | 35PN210, 35PN250, 20PN120 (Nippon Steel / Baowu) | Material certificates |
| Lamination Thickness | 0.15mm / 0.20mm / 0.35mm (customizable) | Micrometer / IEC 60404-2 |
| Core Loss @ 1.0T, 400Hz (0.20mm) | ≤ 8.5 W/kg — 30% lower than 0.35mm | IEC 60404-2 / Reenives R&D |
| Saturation Flux Density Bs | 1.68 – 1.72 T | Epstein frame test |
| Burr Height (max) | < 0.03mm | Optical measurement |
| Epoxy Coating Thickness | 30–60 µm, dielectric > 2.5 kV | ASTM D149 |
| Stacking Factor | ≥ 97.5% | Weight method |
| Concentricity Tolerance | ±0.01mm – ±0.015mm | CMM measurement |
| Slot/Pole Configurations | 9N12P, 12N14P, 24N22P, 36N30P, custom | Reenives design standards |
| Typical Outrunner Efficiency | 90–95% (with matched rotor-stator set) | IEEE Xplore / FEM simulation |
| Flight Time Improvement | 8–12% (vs. standard 0.35mm cores) | Reenives R&D / field testing |
🔬 Data Source: Reenives R&D Report 2024-Q4 + IEC 60404-2 standard + Material certificates + Industry benchmarks .
Applications: FPV Racing, UAV Logistics, eVTOL & More
Matched motor rotor and stator cores power the full spectrum of outrunner drone applications :
| Application | Typical Stator Size | Configuration | Performance Priorities |
|---|---|---|---|
| FPV Racing Drones | 22–30mm | 9N12P, 12N14P | High RPM, rapid acceleration, responsiveness |
| Freestyle / Cinematic FPV | 22–30mm | 12N14P | Smooth torque, thermal stability, consistent power |
| UAV Logistics & Delivery | 30–50mm | 12N14P, 24N22P | Long flight time, payload capacity, reliability |
| UAV Agriculture Spraying | 40–60mm | 24N22P, corrosion-resistant coating | Heavy payload, dust/chemical resistance, power |
| eVTOL / Air Taxi | 50–80mm | 24N22P, 36N30P | Safety, redundancy, high continuous power |
| Micro / Tiny Whoop FPV | 12–20mm | 9N12P | Weight reduction, efficiency at low power |
"A perfectly matched rotor and stator core set is the foundation of every high-efficiency outrunner motor. The precision of the magnetic circuit determines torque density, thermal stability, and overall flight performance."
6-Step Engineering Selection Guide for Outrunner Motor Cores
For UAV motor designers and procurement engineers, selecting the optimal motor rotor and stator cores requires systematic evaluation. Here is a practical 6-step framework :
- Define UAV Class & Performance Requirements – Identify your drone's mission profile:
- FPV racing: High RPM, rapid acceleration, lightweight
- FPV freestyle: Smooth control, consistent power, cooling
- UAV logistics: Long flight time, high payload, efficiency
- UAV agriculture: Heavy lift, dust/chemical resistance, durability
- eVTOL: Safety, redundancy, high continuous power
- Select Stator Outer Diameter – Match motor size to UAV class:
- 12–20mm: Micro drones, tiny whoops
- 22–30mm: FPV racing, freestyle (most popular)
- 30–50mm: Logistics, agriculture, camera platforms
- 50–80mm: Heavy-lift, eVTOL, cargo drones
- 60–200mm: High-power/eVTOL (15–50+ kW)
- Choose Slot/Pole Configuration – Critical for outrunner torque and efficiency :
- 9N12P: High RPM, responsive—FPV racing outrunners
- 12N14P: Near-perfect winding factor (0.933)—most popular for UAVs
- 24N22P: High torque, low cogging—heavy-lift applications
- 36N30P: Maximum torque density—eVTOL
ⓘ "0.20mm laminations reduce core loss by approximately 30% compared to 0.35mm—enabling 15–25% higher torque density for outrunner applications."
- Specify Lamination Thickness – Thinner laminations reduce core loss at high frequencies:
- 0.15mm: Ultimate high-RPM performance, FPV racing outrunners
- 0.20mm: Optimal balance—most outrunner applications
- 0.35mm: Not recommended for high-performance outrunner motors
- Verify Thermal & Structural Requirements – Outrunner motors demand:
- High stacking factor (≥ 97.5%) for maximum magnetic material
- Epoxy coating (30–60µm, Class H 180°C) for thermal durability
- Strong interlock or welding for structural integrity
- Precision concentricity (≤ ±0.01mm) for consistent air gap
- Choose a Global Leading Core Supplier – Evaluate outrunner motor expertise:
- Experience with matched rotor and stator cores for outrunner UAV motors
- Ultra-thin lamination capability (0.15–0.20mm)
- Large diameter capability (up to 200mm)
- Precision stamping: burr < 0.03mm, concentricity ±0.01mm
- Epoxy coating for outrunner thermal environments
- Material certificates and third-party test reports
- Proven global track record with outrunner motor manufacturers
- Engineering support for outrunner motor optimization
FAQ: Motor Rotor & Stator Core Technical Questions
Motor rotor and stator cores are the precision-laminated silicon steel components that form the two magnetic cores of a BLDC outrunner motor. The stator core is the stationary laminated stack with teeth for copper windings, generating the rotating magnetic field. The rotor core is the rotating laminated stack that carries permanent magnets, following the stator's field to produce torque. For outrunner drone motors, matched rotor-stator core sets ensure optimal air gap, minimize eddy current losses, and maximize torque density.
Matching rotor and stator cores is critical because: (1) the air gap between rotor and stator must be consistent—precision in both components ensures this, (2) magnetic flux distribution depends on both components working together, (3) cogging torque is minimized when both are precision-stamped to the same tolerances, and (4) overall motor efficiency is maximized when the magnetic circuits are perfectly matched. Reenives provides matched rotor and stator sets designed to work together as a complete magnetic system.
For outrunner motors, 0.15–0.20mm laminations are optimal. 0.20mm achieves core loss ≤ 8.5 W/kg at 400Hz—approximately 30% lower than conventional 0.35mm material. For FPV racing outrunners operating at extreme RPM, 0.15mm laminations provide ultimate performance. The same thickness should be used for both rotor and stator laminations to ensure matched magnetic performance.
12N14P (12-slot stator, 14-pole rotor) is the most common configuration for outrunner drone motors, offering a near-perfect winding factor of 0.933 and exceptionally low cogging torque. It is widely used across FPV racing, logistics, agriculture, and eVTOL applications. 9N12P is also popular for FPV racing, while 24N22P is preferred for heavy-lift and logistics UAVs.
The air gap is the space between the rotor and stator magnetic surfaces. A perfectly concentric stator core ensures a consistent air gap around the rotor, leading to smooth torque delivery, reduced cogging, and higher efficiency—especially vital for high-RPM drone motors. Precision stamping with concentricity tolerance of ±0.01mm is essential for maintaining consistent air gap and maximizing magnetic coupling.
Epoxy powder coating provides three critical functions for outrunner motor rotor and stator cores: (1) electrical insulation between laminations to minimize eddy currents and prevent interlaminar shorts, (2) thermal durability up to 180°C (Class H) to withstand the heat generated during high-power outrunner operation, and (3) corrosion resistance for operation in outdoor and humid environments. The coating thickness (30–60µm) is optimized with dielectric strength exceeding 2.5 kV.
Yes. Reenives supports full customization of outrunner motor rotor and stator cores including: stator outer diameter (12–200mm), rotor diameter (matched to stator), lamination thickness (0.15–0.20mm), slot/pole configurations (9N12P, 12N14P, 24N22P, 36N30P, custom), stacking height, material grade, and epoxy coating specifications. Private mould development is available for high-volume OEM projects with exclusive design rights.
Why Reenives – Global Leading BLDC Outrunner Drone Motor Rotor and Stator Core Supplier
Reenives has earned its reputation as a Global Leading BLDC Outrunner Drone Motor Rotor and Stator Core Supplier by combining advanced manufacturing technology with deep expertise in matched magnetic circuit design for UAV propulsion and a global supply chain that delivers on time, every time .
Our Advantages — Global Leadership in Outrunner Motor Cores
- ✅ Matched Rotor-Stator Core Sets: Both components designed and stamped to work together for maximum efficiency
- ✅ Ultra-Thin Silicon Steel: 0.15–0.20mm laminations reduce core loss by up to 30%—extending outrunner flight times by 8–12%
- ✅ Precision Progressive Stamping: Burr height < 0.03mm, concentricity ±0.01mm, stacking factor ≥ 97.5%
- ✅ Outrunner-Optimized Configurations: 9N12P, 12N14P, 24N22P, 36N30P—any UAV outrunner application
- ✅ Full Customization: Private mould development, tailored diameters, and custom stack heights
- ✅ Epoxy Coating: 30–60µm, Class H 180°C, dielectric > 2.5 kV
- ✅ Global Quality Control: IEC 60404-2 testing, third-party verification, and material certificates
- ✅ Outrunner Motor Expertise: 4 years of experience with 1,000+ enterprise clients—specializing in UAV propulsion
- ✅ Global Export Capability: Complete export qualifications with worldwide shipping to outrunner manufacturers in 40+ countries
- ✅ 100+ R&D Patents: Continuous innovation in rotor and stator core technology
🌍 Our global leadership promise: Matched rotor and stator cores that deliver longer flight times, higher torque, and cooler operation. Consistent quality that eliminates rework. Engineering support that optimizes your complete magnetic system. Global supply chain that delivers on time, every time. That's why Reenives is the global leading BLDC outrunner drone motor rotor and stator core supplier.
🚁 Ready to power your outrunner motors with globally trusted rotor and stator cores?
Contact Reenives today for engineering consultation, OEM samples, and competitive global pricing.
📱 WhatsApp: +86-13377741885
Dongguan Runlu Motor Technology Co., Ltd.
Reenives — Professional Drone Stator Core Manufacturer
Founded in 2022, Reenives has rapidly grown into a global leading rotor and stator core supplier for the worldwide UAV, FPV, eVTOL, and industrial motor markets .
Independent R&D Technology · Imported stamping & epoxy powder coating production lines · Dust-free workshops · 4 years of manufacturing experience · Solved rotor and stator core challenges for 1,000+ enterprises worldwide—including leading outrunner motor manufacturers .
From production to sales, we support bulk purchasing, private mould development, and sample making. We provide matched rotor and stator solutions for your specific outrunner motor production scenarios—with competitive global pricing, consistent quality, and reliable on-time delivery .
🌐 www.reenives-bldcmotor.com | 📧 linda_reenives@163.com | 📱 +86-13377741885
✈️ Global outrunner motor manufacturers welcome — consult, visit the factory, or request free samples today!
Reenives — Global Leading BLDC Outrunner Drone Motor Rotor and Stator Core Supplier
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