Global Leading Drone Stators and Rotors Supplier
Stators and Rotors — Precision Cores for Drone & BLDC Motors | Reenives Stator Core Supplier
⚠️ Are your stators and rotors causing high core loss, excess heat, or vibration? Mismatched stator-rotor pairs, poor lamination quality, thick steel, weak insulation, or loose tolerances can reduce efficiency, shorten flight time, and lead to premature motor failure — especially in high-RPM drone brushless motors.
✅ Reenives engineers matched stators and rotors designed for drone brushless motors. With imported high-speed stamping lines, epoxy powder coating, and dust-free workshops, we produce both stator and rotor cores with low core loss, tight tolerances, and consistent air gaps. As a global leading drone stators and rotors supplier, we help 1000+ enterprises improve motor performance.
📋 Table of Contents
What Are Stators and Rotors?
Stators and rotors are the two core magnetic components of a brushless motor. The stator is the stationary part, made from laminated silicon steel with slots that hold copper windings. The rotor is the rotating part, carrying permanent magnets (in BLDC motors) or cage bars (in induction motors). Together, they form the electromagnetic circuit that converts electrical energy into mechanical torque.
In drone brushless motors, the stator and rotor must be designed as a matched pair. Their material grade, lamination thickness, slot/pole combination, and air gap directly affect:
- Motor efficiency & flight endurance
- Cogging torque & vibration levels
- Heat generation & thermal management
- Power density & thrust-to-weight ratio
A well-matched stator and rotor pair minimizes eddy current losses, maximizes magnetic flux linkage, and maintains tight dimensional accuracy for smooth rotation.
Precision stators and rotors — manufactured by Reenives with imported stamping & epoxy powder coating lines.
Types of Stators and Rotors
Stators and rotors are available in several designs, each suited to different motor architectures and performance requirements. Reenives manufactures the following types:
- Outrunner Stators & Rotors — Stator inside, rotor (outer bell) spins outside. Common in drone propulsion for high torque and direct propeller mounting.
- Inrunner Stators & Rotors — Rotor spins inside the stator. Used in high-RPM applications like EDFs and ducted fans.
- Segmented Stators — Individual teeth wound separately and assembled, achieving higher slot fill factors.
- Surface-Mount Rotors — Permanent magnets mounted on the rotor surface. Common in high-torque drone motors.
- Interior Permanent Magnet (IPM) Rotors — Magnets embedded inside the rotor laminations. Higher reluctance torque and better field weakening.
- Bonded Stators & Rotors — Laminations bonded with adhesive instead of interlocking, reducing eddy current losses at high frequencies.
- Epoxy-Coated Stators & Rotors — Powder-coated for enhanced insulation, corrosion resistance, and wire adhesion.
- Custom Stators & Rotors — Private mould development for unique slot counts, diameters, stack lengths, and magnet configurations.
Whether you need a standard 12-slot/14-pole outrunner pair or a custom high-frequency design, Reenives can deliver.
Key Specifications & Data
Below are typical specifications for Reenives stators and rotors. 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 |
| Stator Outer Diameter | 20 mm – 200 mm | Customizable |
| Stator Inner Diameter | 10 mm – 180 mm | Depends on rotor design |
| Rotor Outer Diameter | 10 mm – 180 mm | Matched to stator bore |
| Stack Length | 5 mm – 80 mm | Affects torque & power |
| Slot Number | 6, 9, 12, 18, 24, etc. | Matches pole count |
| Pole Number | 4, 6, 8, 14, 28, etc. | Matched to slot number |
| Air Gap | 0.2 mm – 1.0 mm | Affects efficiency & cogging |
| 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 and Rotors
Reenives stators and rotors are used across a wide range of drone and brushless motor applications:
- FPV Racing Drones — High RPM, lightweight stator-rotor pairs with low cogging torque.
- Cinematic & Photography Drones — Smooth, vibration-free pairs for stable aerial footage.
- Agricultural Spraying Drones — Corrosion-resistant epoxy-coated pairs for harsh chemical environments.
- Industrial Inspection Drones — High-torque pairs for long endurance and heavy payloads.
- eVTOL & UAV Propulsion — Custom high-power pairs for next-generation air mobility.
- General BLDC Motors — Fans, pumps, robotics, power tools, and automotive actuators.
Reenives stators and rotors power FPV, agricultural, cinematic, and industrial UAVs worldwide.
How to Select the Right Stators and Rotors
Choosing the correct stator and rotor pair for your drone brushless motor involves several engineering decisions. Follow these steps:
- Determine Motor Type — Outrunner or inrunner? Outrunner pairs are common in drones for high torque; inrunner pairs 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.
- Design the Air Gap — The gap between stator bore and rotor outer diameter must be small enough for efficiency but large enough for mechanical clearance.
- Decide on Magnet Configuration — Surface-mount or interior permanent magnet rotors each have trade-offs in torque, cost, and field weakening capability.
- Consider Insulation & Coating — Epoxy powder coating is recommended for moisture, vibration, and chemical resistance.
- Request Samples & Test — Reenives provides free samples for qualified projects. Test core loss, temperature rise, cogging torque, and mechanical fit.
FAQ — Stator & Rotor Parameters
Q1: What is the difference between a stator and a rotor?
A: The stator is the stationary part of the motor, made from laminated silicon steel with slots that hold copper windings. The rotor is the rotating part, which carries permanent magnets in a BLDC motor. In an outrunner motor, the rotor spins outside the stator; in an inrunner motor, the rotor spins inside the stator. Both are typically made from the same lamination material and must be designed as a matched pair.
Source: Reenives engineering team, based on motor design principles.
Q2: What lamination thickness do you recommend for high-RPM 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.
Q3: What is the typical core loss of your stators and rotors?
A: Our standard stators and rotors 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: What air gap do you recommend between stator and rotor?
A: For drone brushless motors, we typically recommend an air gap of 0.2 mm to 1.0 mm, depending on motor size and rotor design. A smaller air gap improves magnetic flux linkage and efficiency but requires tighter tolerances to avoid mechanical interference. Our high-precision stamping ensures stator bore and rotor outer diameter tolerances of ±0.05 mm, allowing reliable small air gaps.
Source: Reenives engineering team, based on motor design guidelines.
Q5: Do you offer epoxy powder coating for stators and rotors?
A: Yes. We use imported epoxy powder coating equipment to apply a uniform, pinhole-free insulation layer on stator and rotor laminations. This coating improves corrosion resistance, enhances wire adhesion, and protects against moisture — critical for agricultural and marine drones.
Source: Reenives production specification.
Q6: Can you develop custom stators and rotors for my specific drone motor?
A: Absolutely. We support private mould development. Provide us with your required stator outer diameter, stator bore, rotor outer diameter, stack length, slot number, pole number, and magnet configuration. Our R&D team will design and produce a matched stator and rotor pair tailored to your motor. Tooling lead time is typically 15–25 days.
Source: Reenives custom development process.
Summary — Get Your Stators and Rotors Quote Today
Ready to Improve Your Drone Motor Performance with Matched Stators and Rotors?
Reenives is a global leading drone stators and rotors supplier with 4 years of manufacturing experience, 100+ R&D patents, and 3 production bases. We serve 1000+ enterprises worldwide with high-precision stators and rotors 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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