Out-slot
Outrunner Stator – High-Torque Cores for Drone, UAV & FPV Propulsion
Outrunner motor torque limiting your drone's payload capacity? Need a trusted stator core supplier in Poland?Anoutrunner stator is the stationary laminated magnetic core of an outrunner motor—the component that generates the rotating magnetic field essential for high-torque drone propulsion. As a leading drone UAV FPV outrunner stator core supplier in Poland and globally, Reenives delivers precision outrunner stators 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%, maximizing torque density, and enabling reliable propulsion for FPV racing, UAV logistics, agriculture, and eVTOL applications. With reliable shipping to Poland and worldwide, we bring precision engineering to your doorstep.
- •What Is an Outrunner Stator?
- •Classification of Outrunner Stators
- •Technical Specifications & Verified Data
- •Applications: FPV Racing, UAVs, eVTOL & More
- •6-Step Engineering Selection Guide for Outrunner Stators
- •FAQ: Outrunner Stator Technical Questions
- •Why Reenives – Leading Drone UAV FPV Outrunner Stator Core Supplier in Poland
- •Dongguan Runlu Motor Technology Co., Ltd.
What Is an Outrunner Stator?
Anoutrunner stator is the stationary laminated magnetic core of an outrunner brushless motor—where the rotor spins on the outside of the stator. This configuration delivers exceptional torque density, smooth low-speed operation, and direct-drive efficiency for propeller applications. The stator core is the critical component that generates the rotating magnetic field essential for propulsion.
Key advantages of outrunner stators:
- High torque density – Large stator diameter provides mechanical advantage for direct-drive propellers
- Smooth low-speed operation – Excellent for drone hover and precision control
- Direct drive capability – No gearbox needed; propeller mounts directly to the rotor
- High efficiency – Eliminates gearbox losses for maximum energy efficiency
ⓘ Outrunner stator insight:"A high-quality outrunner stator is the foundation of every drone propulsion system—delivering the torque density and reliability that FPV pilots and UAV operators depend on."
Reenives manufactures precision outrunner stators using imported 0.2mm silicon steel, progressive stamping dies, and automated epoxy powder coating—enabling maximum torque density for demanding drone, UAV, and eVTOL applications.
Classification of Outrunner Stators
Reenives supplies outrunner stators across four primary series, tailored to different power classes and applications:
| Series | Power Range | Stator OD (mm) | Slot/Pole Configuration | Lamination Thickness | Best For |
|---|---|---|---|---|---|
| Series A – Micro Outrunner | <500W | 12–22mm | 9N12P | 0.15–0.20mm | Micro drones, tiny whoops |
| Series B – FPV / Racing | 500W–3kW | 22–30mm | 9N12P, 12N14P | 0.15–0.20mm | FPV racing, freestyle drones |
| Series C – Mid-Power UAV | 3–15kW | 30–60mm | 12N14P, 24N22P | 0.20mm | Logistics, agriculture, camera drones |
| Series D – High-Power / eVTOL | 15–50+ kW | 60–200mm | 24N22P, 36N30P, 48N40P | 0.20mm | Heavy-lift, eVTOL, electric aviation |
Outrunner stators are characterized by:
- Large diameter – Up to 200mm to accommodate high torque requirements
- Multi-pole configurations – 9N12P, 12N14P, 24N22P, 36N30P for smooth torque
- Thin laminations – 0.15–0.20mm to minimize core loss at high frequencies
- High stacking factor – ≥ 97% for maximum magnetic material density
Technical Specifications & Verified Data
All performance data below is derived from Reenives in-house laboratory testing (IEC 60404-2), third-party validation, and peer-reviewed outrunner motor research.
| Parameter | Value / Range (Reenives Standard) | Test Standard / Source |
|---|---|---|
| Stator Outer Diameter | 12–200mm (customizable) | CMM / optical comparator |
| Material Type | Non-grain oriented silicon steel (CRNGO) | Material certificates / IEC 60404 |
| Common Grades | 35PN210, 35PN250 (Nippon Steel / Baowu) | Material certificates |
| Lamination Thickness | 0.15mm / 0.20mm / 0.27mm / 0.35mm | 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% | Weight method |
| Concentricity Tolerance | ±0.01mm – ±0.015mm | CMM measurement |
| Slot/Pole Configurations | 9N12P, 12N14P, 24N22P, 36N30P, custom | Reenives design standards |
| Winding Factor (12N14P) | 0.933 (near-perfect) | BLDC winding theory |
| Typical Outrunner Efficiency | 90–95% (with optimized stator) | IEEE Xplore / FEM simulation |
| Torque Density Improvement | 15–25% (vs. standard 0.35mm stator) | Reenives R&D / thermal analysis |
🔬Data Source: Reenives R&D Report 2024-Q4 + IEC 60404-2 standard + Material certificates + IEEE Xplore outrunner motor studies.
Applications: FPV Racing, UAVs, eVTOL & More
Outrunner stator cores power a wide range of drone and UAV applications:
| Application | Power Range | Stator Requirements | Performance Priorities |
|---|---|---|---|
| FPV Racing Drones | 500W–3kW | 9N12P/12N14P, 0.15–0.20mm | High RPM, rapid acceleration, responsiveness |
| Logistics & Delivery Drones | 3–15kW | 24N22P, 0.20mm, high efficiency | Long flight time, payload capacity, reliability |
| Agriculture Spraying UAVs | 3–15kW | 24N22P, corrosion-resistant coating | Heavy payload, dust/chemical resistance, durability |
| eVTOL / Air Taxis | 15–50+ kW | 36N30P, 48N40P, 0.20mm | Safety, redundancy, high continuous power |
| Heavy-Lift Cargo Drones | 5–20kW | 24N22P, 36N30P | Maximum thrust, reliability, sustained power |
"Outrunner stators with precision cores deliver exceptional torque density—enabling direct-drive propulsion without the complexity and losses of gearboxes."
6-Step Engineering Selection Guide for Outrunner Stators
For motor designers and procurement engineers, selecting the optimal outrunner stator requires systematic evaluation. Here is a practical 6-step framework:
- Define Power & Torque Requirements – Identify your motor's performance targets:
- Continuous power: 500W, 5kW, 15kW, 50+ kW?
- Peak torque: How much overload capacity is needed?
- Operating RPM range: Low-speed high-torque or high-speed?
- Select Stator Outer Diameter – Match motor size to power class:
- 12–22mm: Micro outrunners (<500W)
- 22–30mm: FPV/racing (500W–3kW)
- 30–60mm: Mid-power UAV (3–15kW)
- 60–200mm: High-power/eVTOL (15–50+ kW)
- Choose Slot/Pole Configuration – Critical for torque and efficiency:
- 9N12P: Most common for FPV—excellent torque and smoothness
- 12N14P: Near-perfect winding factor (0.933)—most popular for UAVs
- 24N22P: High torque, low cogging, heavy-lift applications
- 36N30P: Maximum torque density for eVTOL
- 48N40P: Ultra-smooth, extreme power applications
- Specify Lamination Thickness – Thinner laminations reduce core loss at high frequencies:
- 0.15mm: Ultimate high-RPM performance, racing outrunners
- 0.20mm: Optimal balance—most outrunner applications
- 0.35mm: Not recommended for high-performance outrunner motors
ⓘ"0.20mm laminations reduce core loss by approximately 30% compared to 0.35mm—enabling 15–25% higher torque density."
- Verify Thermal & Structural Requirements – Outrunner motors demand:
- High stacking factor (≥ 97%) 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 Leading Outrunner Stator Supplier – Evaluate expertise:
- Global experience with outrunner stator designs (9N12P, 12N14P, 24N22P, etc.)
- 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
- Reliable shipping to Poland and worldwide
- Engineering support for outrunner motor optimization
FAQ: Outrunner Stator Technical Questions
An outrunner stator is the stationary laminated magnetic core of an outrunner brushless motor—where the rotor spins on the outside. Outrunner stators are preferred for drone applications because: (1) they enable high torque density with large diameter designs, (2) provide smooth low-speed operation ideal for drone hover and precision control, (3) allow direct propeller drive without gearboxes—reducing weight and complexity, and (4) eliminate gearbox losses for maximum efficiency. The 12N14P configuration is the most popular for UAV outrunner stators, offering a near-perfect winding factor of 0.933.
For outrunner motors, the optimal stator configuration depends on the application: (1) 9N12P is most common for FPV and racing outrunners—excellent torque and smoothness, (2) 12N14P offers near-perfect winding factor (0.933) and is most popular for UAV applications, (3) 24N22P provides high torque with low cogging for heavy-lift and logistics drones, (4) 36N30P delivers maximum torque density for eVTOL applications. Reenives supports all these configurations with custom tooling.
Lamination thickness directly impacts core loss in outrunner stators. 0.20mm laminations achieve core loss ≤ 8.5 W/kg at 400Hz—approximately 30% lower than 0.35mm material. For outrunner motors, this reduction in core loss translates to: (1) higher torque density (15–25% improvement), (2) cooler operation, (3) higher efficiency (90–95%), and (4) reduced cooling requirements. 0.15mm laminations provide ultimate performance for racing and extreme applications.
Epoxy powder coating provides three critical functions for outrunner stator cores: (1) electrical insulation between laminations to minimize eddy currents and prevent interlaminar shorts—critical for high-current operation, (2) thermal durability up to 180°C (Class H) to withstand the heat generated during sustained high-torque operation, and (3) corrosion resistance for outdoor UAV and marine applications. The coating thickness (30–60µm) is optimized with dielectric strength exceeding 2.5 kV.
Burr height is the raised edge left on stamped metal after the punching process. In outrunner stator cores, burr height must be maintained below 0.03mm because excessive burrs can: (1) damage enamel insulation on copper windings during assembly—causing short circuits, (2) create localized magnetic saturation points that reduce torque output, (3) increase core loss through eddy current concentration, and (4) reduce motor reliability—critical for UAV applications where motor failure means crashing. Reenives maintains burr height < 0.03mm through precision progressive stamping dies.
Yes. Reenives supports full customization of outrunner stators including: stator outer diameter (12–200mm), lamination thickness (0.15–0.20mm), slot/pole configurations (9N12P, 12N14P, 24N22P, 36N30P, 48N40P, custom), stacking height, material grade, and epoxy coating specifications. Private mould development is available for high-volume OEM projects with exclusive design rights—from micro racing outrunners to large eVTOL propulsion systems.
Why Reenives – Leading Drone UAV FPV Outrunner Stator Core Supplier in Poland
Reenives has earned its reputation as a leading drone UAV FPV outrunner stator core supplier in Poland and globally by combining advanced manufacturing technology with deep expertise in outrunner motor design and a reliable global supply chain.
Our Advantages — Outrunner Stator Specialists
- ✅Ultra-Thin Silicon Steel: 0.15–0.20mm laminations reduce core loss by up to 30%—enabling 15–25% higher torque density
- ✅Large Diameter Capability: Stator OD up to 200mm for high-power outrunner motors
- ✅Multi-Pole Expertise: 9N12P, 12N14P, 24N22P, 36N30P, 48N40P, and custom configurations
- ✅Precision Stamping: Burr height < 0.03mm, concentricity ±0.01mm, stacking factor ≥ 97%
- ✅Epoxy Coating: 30–60µm, Class H 180°C, dielectric > 2.5 kV
- ✅Full Customization: Private mould development for exclusive outrunner designs
- ✅Trusted Quality Control: IEC 60404-2 testing, third-party verification, material certificates
- ✅Global Export: Complete export qualifications with reliable shipping to Poland and worldwide
- ✅Proven Track Record: 4 years experience, 1,000+ enterprise clients, 100+ R&D patents
🌍Our leadership promise: Outrunner stator cores that maximize torque density and thermal limits. Consistent quality that eliminates rework. Engineering support that optimizes your outrunner motor design. Reliable global supply chain that delivers to Poland and worldwide. That's why Reenives is the leading drone UAV FPV outrunner stator core supplier in Poland.
⚡ Ready to maximize your outrunner motor's torque density with precision stator cores?
Contact Reenives today for engineering consultation, OEM samples, and competitive global pricing with reliable shipping to Poland.
📱 WhatsApp: +86-13377741885
Dongguan Runlu Motor Technology Co., Ltd.
Reenives — Professional Drone Stator Core Manufacturer
Founded in 2022, Reenives has rapidly grown into a leading outrunner stator core supplier for the worldwide drone, UAV, FPV, and eVTOL markets—serving clients in Poland and globally.
Independent R&D Technology · Imported stamping & epoxy powder coating production lines · Dust-free workshops · 4 years of manufacturing experience · Solved outrunner stator challenges for 1,000+ enterprises worldwide—including leading drone and UAV manufacturers.
From production to sales, we support bulk purchasing,private mould development, and sample making. We provide tailor-made solutions for your specific outrunner motor production scenarios—with competitive global pricing, consistent quality, and reliable on-time delivery to Poland and beyond.
🌐www.reenives-bldcmotor.com | 📧 linda_reenives@163.com | 📱 +86-13377741885
✈️ Global outrunner motor manufacturers welcome — consult, visit the factory, or request free samplestoday!
Reenives — Leading Drone UAV FPV Outrunner Stator Core Supplier in Poland
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