Outrunner UAV Motor Stator Core Supplier
Outrunner — Outrunner UAV Motor Stator Cores for Drone & Brushless Motors | Reenives Stator Core Supplier
⚠️ Is your outrunner motor underperforming due to high core loss, poor torque density, or stator vibration? In an outrunner configuration, the rotor spins outside the stator — so the stator core must deliver high torque at lower RPM while staying cool and rigid. Poor laminations, thick steel, or weak insulation can ruin efficiency and shorten flight time.
✅ Reenives engineers outrunner stator cores designed specifically for UAV propulsion. With imported high-speed stamping lines, epoxy powder coating, and dust-free workshops, we produce outrunner stator cores with low core loss, high slot fill, and tight tolerances. As an outrunner UAV motor stator core supplier, we help 1000+ enterprises improve motor performance.
📋 Table of Contents
What Is an Outrunner Motor?
An outrunner is a brushless motor configuration where the permanent-magnet rotor spins on the outside of the stationary stator, rather than inside it. The stator core sits at the center, and the rotating outer bell carries the magnets and typically mounts the propeller directly.
Outrunner motors are the dominant choice for drone propulsion because they deliver high torque at lower RPM, allowing direct-drive propeller mounting without a gearbox. The stator core in an outrunner motor directly affects:
- Torque density & thrust output
- Motor efficiency & flight endurance
- Heat dissipation & thermal stability
- Cogging torque & vibration levels
A well-built outrunner stator core minimizes eddy current losses, maximizes slot fill factor, and maintains tight dimensional accuracy for smooth rotor-stator interaction.
Precision outrunner UAV motor stator core — manufactured by Reenives with imported stamping & epoxy powder coating lines.
Types of Outrunner Stator Cores
Outrunner stator cores are available in several designs, each suited to different motor architectures and performance requirements. Reenives manufactures the following types:
- Segmented Outrunner Stators — Individual teeth are wound separately and assembled, achieving higher slot fill factors. Ideal for high-torque drone motors.
- One-Piece Laminated Outrunner Stators — Traditional stacked lamination construction, cost-effective for medium to high-volume production.
- Bonded Outrunner Stators — Laminations bonded with adhesive instead of interlocking, reducing eddy current losses at high frequencies.
- Epoxy-Coated Outrunner Stators — Powder-coated for enhanced insulation, corrosion resistance, and wire adhesion — critical for agricultural and industrial drones.
- High-Pole-Count Outrunner Stators — Designed for 12S/14P, 24S/28P, and other high pole count configurations common in UAV propulsion.
- Custom Outrunner Stators — Private mould development for unique slot counts, diameters, stack lengths, and mounting interfaces.
Whether you need a standard 12-slot/14-pole outrunner stator or a custom high-torque design, Reenives can deliver.
Key Specifications & Data
Below are typical specifications for Reenives outrunner stator cores. Custom values are available upon request.
| Parameter | Typical Range / Value | Notes |
|---|---|---|
| Lamination Material | Silicon steel (e.g., 35WW250, 50WW470) | Low core loss grades |
| Lamination Thickness | 0.20 mm – 0.50 mm | Thinner = lower eddy current loss |
| Outer Diameter | 20 mm – 200 mm | Customizable |
| Inner Diameter | 10 mm – 180 mm | Depends on rotor design |
| Stack Length | 5 mm – 80 mm | Affects torque & power |
| Slot Number | 6, 9, 12, 18, 24, etc. | Matches pole count |
| Motor Configuration | Outrunner | Rotor outside stator |
| Insulation Coating | Epoxy powder coating | Uniform, pinhole-free |
| Core Loss (at 400Hz, 1T) | ≤ 25 W/kg | Material dependent |
| Tolerance | ±0.05 mm (critical dimensions) | High-precision stamping |
| Stacking Factor | ≥ 95% | Minimizes air gaps |
Data source: Reenives internal testing & supplier material datasheets, 2024. Actual values may vary by design.
Applications of Outrunner Stator Cores
Reenives outrunner stator cores are used across a wide range of UAV and brushless motor applications:
- FPV Racing Drones — High RPM, lightweight outrunner stators with low cogging torque.
- Cinematic & Photography Drones — Smooth, vibration-free outrunner stators for stable aerial footage.
- Agricultural Spraying Drones — Corrosion-resistant epoxy-coated stators for harsh chemical environments.
- Industrial Inspection Drones — High-torque outrunner stators for long endurance and heavy payloads.
- eVTOL & UAV Propulsion — Custom high-power outrunner stators for next-generation air mobility.
- General BLDC Motors — Fans, pumps, robotics, power tools, and automotive actuators.
Reenives outrunner UAV motor stator cores power FPV, agricultural, cinematic, and industrial UAVs worldwide.
How to Select the Right Outrunner Stator Core
Choosing the correct outrunner stator core for your motor involves several engineering decisions. Follow these steps:
- Determine Required Torque & RPM — Outrunner motors excel at high torque, lower RPM. Higher torque needs more stack length or larger diameter.
- Select Slot/Pole Combination — Common drone outrunners use 12S/14P or 24S/28P. This affects cogging torque, winding factor, and efficiency.
- Choose Lamination Thickness — For high-frequency operation (e.g., 400Hz+), use 0.20 mm laminations to reduce eddy current losses.
- Select Material Grade — Lower-loss silicon steel grades (e.g., 35WW250) reduce heat but cost more. Balance performance and budget.
- Consider the Outer Bell Clearance — The stator outer diameter must leave adequate air gap for the rotating magnet bell.
- Decide on Insulation & Coating — Epoxy powder coating is recommended for moisture, vibration, and chemical resistance.
- Verify Tolerances & Stacking Factor — Tight tolerances and high stacking factor ensure proper magnetic performance and reduce vibration.
- Request Samples & Test — Reenives provides free samples for qualified projects. Test core loss, temperature rise, and mechanical fit.
FAQ — Outrunner Stator Core Parameters
Q1: What is the difference between an outrunner and inrunner stator core?
A: In an outrunner motor, the rotor (with magnets) spins outside the stator, so the stator core sits at the center of the motor. In an inrunner motor, the rotor spins inside the stator. Outrunner stators are typically larger in diameter and optimized for high torque at lower RPM — ideal for direct-drive drone propellers. Inrunner stators are smaller in diameter and optimized for high RPM — used in ducted fans and EDFs.
Source: Reenives engineering team, based on motor design guidelines.
Q2: What lamination thickness do you recommend for high-RPM outrunner UAV motors?
A: For high-RPM outrunner UAV motors (above 10,000 RPM), we recommend 0.20 mm or 0.25 mm silicon steel laminations. Thinner laminations significantly reduce eddy current losses, which helps keep the motor cool and improves efficiency. For lower RPM applications, 0.35 mm or 0.50 mm can be more cost-effective.
Source: Reenives engineering team, based on motor design guidelines and material datasheets.
Q3: What is the typical core loss of your outrunner stator cores?
A: Our standard outrunner stator cores using 35WW250 silicon steel typically exhibit core loss ≤ 25 W/kg at 400Hz and 1 Tesla. With premium low-loss materials, we can achieve even lower values. Actual core loss depends on lamination thickness, material grade, and operating frequency.
Source: Reenives internal testing data, 2024.
Q4: Do you offer epoxy powder coating for outrunner stator cores?
A: Yes. We use imported epoxy powder coating equipment to apply a uniform, pinhole-free insulation layer. This coating improves corrosion resistance, enhances wire adhesion, and protects against moisture — critical for agricultural and marine drones.
Source: Reenives production specification.
Q5: Can you develop custom outrunner stator cores for my specific UAV motor?
A: Absolutely. We support private mould development. Provide us with your required outer diameter, inner diameter, stack length, slot number, and any mounting features. Our R&D team will design and produce a custom outrunner stator core tailored to your motor. Tooling lead time is typically 15–25 days.
Source: Reenives custom development process.
Q6: What is the minimum order quantity (MOQ) for outrunner stator cores?
A: For standard designs, our MOQ is flexible — we support bulk purchasing as well as sample orders. For custom private mould projects, MOQ depends on the tooling and design complexity. Please contact us with your requirements for a precise quote.
Source: Reenives sales policy.
Summary — Get Your Outrunner UAV Motor Stator Core Quote Today
Ready to Improve Your Outrunner UAV Motor Performance?
Reenives is an outrunner UAV motor stator core supplier with 4 years of manufacturing experience, 100+ R&D patents, and 3 production bases. We serve 1000+ enterprises worldwide with high-precision outrunner stator cores for UAV and BLDC motors.
📦 Bulk purchasing · 🔧 Private mould development · 🧪 Free samples
🌐 Official Website: www.reenives-bldcmotor.com
📧 Email: linda_reenives@163.com
Contact us now for a free sample and tailored solution for your production scenario.
Dongguan Runlu Motor Technology Co., Ltd.
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 develop, 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!
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