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Stator — Outrunner BLDC UAV Motor Stators for Drone & Brushless Motors | Reenives Stator Core Supplier
⚠️Is your outrunner BLDC UAV motor stator causing high core loss, excess heat, or vibration? Poor lamination quality, thick steel, weak insulation, or loose tolerances can reduce efficiency, shorten flight time, and lead to premature motor failure.
✅Reenives engineers outrunner BLDC UAV motor stators for efficiency and reliability. With imported high-speed stamping lines, epoxy powder coating, and dust-free workshops, we produce stators with low core loss, high slot fill, and tight tolerances. As a pioneer outrunner BLDC UAV motor stator supplier in China, we help 1000+ enterprises improve motor performance.
📋 Table of Contents
What Is a Stator?
Thestator is the stationary electromagnetic core of a brushless motor. It is typically made from laminated silicon steel with slots that house copper windings. When current flows through the windings, the stator generates a rotating magnetic field that drives the permanent-magnet rotor — the rotating part that produces torque and thrust.
In outrunner BLDC UAV motors, the stator sits inside a rotating outer bell, making its design critical for efficiency and thermal performance. Its design directly affects:
- Motor efficiency & flight endurance
- Heat generation & thermal management
- Cogging torque & vibration levels
- Power density & thrust-to-weight ratio
A well-manufactured stator minimizes eddy current losses, maximizes slot fill factor, and maintains tight dimensional accuracy for smooth rotor-stator interaction.
Precision outrunner BLDC UAV motor stator — manufactured by Reenives with imported stamping & epoxy powder coating lines.
Types of Stators
Stators are available in several designs, each suited to different motor architectures and performance requirements. Reenives manufactures the following types:
- Outrunner BLDC Stators — Designed for motors where the rotor spins outside the stator. Common in drone propulsion for high torque and direct propeller mounting.
- Inrunner BLDC Stators — Designed for motors where the rotor spins inside the stator. Used in high-RPM applications like EDFs and ducted fans.
- Segmented Stators — Individual teeth are wound separately and assembled, achieving higher slot fill factors. Ideal for high-torque drone motors.
- One-Piece Laminated Stators — Traditional stacked lamination construction, cost-effective for medium to high-volume production.
- Bonded Stators — Laminations bonded with adhesive instead of interlocking, reducing eddy current losses at high frequencies.
- Epoxy-Coated Stators — Powder-coated for enhanced insulation, corrosion resistance, and wire adhesion — critical for agricultural and industrial drones.
- Custom 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-frequency design, Reenives can deliver.
Key Specifications & Data
Below are typical specifications for Reenives stators. 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 Type | Outrunner / Inrunner | Application dependent |
| 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 |
Data source: Reenives internal testing & supplier material datasheets, 2024. Actual values may vary by design.
Applications of Stators
Reenives stators are used across a wide range of drone and brushless motor applications:
- FPV Racing Drones — High RPM, lightweight outrunner stators with low cogging torque.
- Cinematic & Photography Drones — Smooth, vibration-free stators for stable aerial footage.
- Agricultural Spraying Drones — Corrosion-resistant epoxy-coated stators for harsh chemical environments.
- Industrial Inspection Drones — High-torque stators for long endurance and heavy payloads.
- eVTOL & UAV Propulsion — Custom high-power stators for next-generation air mobility.
- General BLDC Motors — Fans, pumps, robotics, power tools, and automotive actuators.
Reenives outrunner BLDC UAV motor stators power FPV, agricultural, cinematic, and industrial UAVs worldwide.
How to Select the Right Stator
Choosing the correct stator for your motor involves several engineering decisions. Follow these steps:
- Determine Motor Type — Outrunner or inrunner? Outrunner stators are common in drones for high torque; inrunner stators suit high-RPM ducted fans.
- Determine Required Torque & RPM — Higher torque needs more stack length or larger diameter. High RPM demands thinner laminations and low-loss material.
- Select Slot/Pole Combination — Common drone motors use 12S/14P or 9S/6P. 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.
- Decide on Insulation & Coating — Epoxy powder coating is recommended for moisture, vibration, and chemical resistance.
- Consider Assembly Method — Segmented stators offer higher slot fill; one-piece stators are more economical.
- Verify Tolerances & Fit — Ensure inner diameter matches rotor, and mounting holes align with your motor housing.
- Request Samples & Test — Reenives provides free samples for qualified projects. Test core loss, temperature rise, and mechanical fit.
FAQ — Stator Parameters
Q1: What lamination thickness do you recommend for high-RPM outrunner drone motors?
A: For high-RPM drone 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.
Q2: What is the typical core loss of your stators?
A: Our standard stators 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.
Q3: Do you offer epoxy powder coating for stators?
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.
Q4: What is the dimensional tolerance of your stators?
A: For critical dimensions such as inner diameter, outer diameter, and stack length, we maintain tolerances of ±0.05 mm. For less critical features, ±0.10 mm is standard. Tighter tolerances can be achieved upon request with our high-precision stamping lines.
Source: Reenives quality control standards.
Q5: Can you develop custom outrunner stators 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 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 stators?
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 Stator Quote Today
Ready to Improve Your Outrunner BLDC UAV Motor Performance?
Reenives is a pioneer outrunner BLDC UAV motor stator supplier in China with 4 years of manufacturing experience, 100+ R&D patents, and 3 production bases. We serve 1000+ enterprises worldwide with high-precision stators 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!
ReenivesRunlu MotorOutrunner BLDC Stator
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