Drone BLDC Outrunner Motor Stack Supplier
Motor Stack — Drone BLDC Outrunner Motor Stacks for UAV & Brushless Motors | Reenives Stator Core Supplier
⚠️ Is your motor stack suffering from loose layers, high core loss, or poor stacking factor? Weak interlocking, inconsistent lamination thickness, burrs, or air gaps between layers can reduce motor efficiency, cause overheating, and lead to vibration — especially in high-RPM drone BLDC outrunner motors.
✅ Reenives builds precision motor stacks engineered for drone BLDC outrunner motors. With imported high-speed stamping lines, epoxy powder coating, and dust-free workshops, we deliver stacks with low core loss, tight tolerances, and consistent stacking pressure. As a drone BLDC outrunner motor stack supplier, we help 1000+ enterprises improve motor reliability.
📋 Table of Contents
What Is a Motor Stack?
A motor stack is the assembled laminated core of a motor — formed by stacking multiple thin electrical steel laminations together and securing them by interlocking, bonding, welding, or clamping. The stack forms the stator or rotor core, providing a low-reluctance magnetic path while limiting eddy current losses through layer separation.
In drone BLDC outrunner motors, the motor stack is the structural and electromagnetic backbone of the motor. Its stacking quality, material grade, and dimensional accuracy directly affect:
- Core loss & motor efficiency
- Stacking factor & flux density
- Mechanical rigidity & vibration resistance
- Heat dissipation & thermal stability
A well-built motor stack minimizes air gaps, reduces losses, and maintains consistent performance across the entire RPM range.
Precision drone BLDC outrunner motor stack — manufactured by Reenives with imported high-speed stamping & epoxy powder coating lines.
Types of Motor Stacks
Motor stacks are assembled using different methods depending on motor design, cost, and performance requirements. Reenives manufactures the following types:
- Interlocked Motor Stacks — Laminations with integral dimples or dovetails that lock together under pressure. Cost-effective, no adhesive required.
- Bonded Motor Stacks — Laminations coated with adhesive and cured under heat and pressure. Lower eddy current losses and better damping.
- Welded Motor Stacks — Laminations welded along the outer diameter. High mechanical strength for high-vibration applications.
- Clamped Motor Stacks — Laminations held together with end plates and bolts or rivets. Allows for easy disassembly and repair.
- Segmented Motor Stacks — Individual teeth wound separately and assembled into a full ring. Higher slot fill factor.
- Epoxy-Coated Motor Stacks — Individual laminations coated with epoxy powder before stacking for superior insulation and corrosion resistance.
Whether you need standard interlocked stacks or custom bonded assemblies, Reenives can deliver.
Key Specifications & Data
Below are typical specifications for Reenives motor stacks. 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 |
| Assembly Method | Interlocked, bonded, welded, clamped | Depends on application |
| Motor Configuration | Outrunner / Inrunner | Outrunner common in drones |
| 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 Motor Stacks
Reenives motor stacks are used across a wide range of drone BLDC outrunner and brushless motor applications:
- FPV Racing Drones — High RPM, lightweight stacks with low cogging torque.
- Cinematic & Photography Drones — Smooth, vibration-free stacks for stable aerial footage.
- Agricultural Spraying Drones — Corrosion-resistant epoxy-coated stacks for harsh chemical environments.
- Industrial Inspection Drones — High-torque stacks for long endurance and heavy payloads.
- eVTOL & UAV Propulsion — Custom high-power stacks for next-generation air mobility.
- General BLDC Motors — Fans, pumps, robotics, power tools, and automotive actuators.
Reenives drone BLDC outrunner motor stacks power FPV, agricultural, cinematic, and industrial UAVs worldwide.
How to Select the Right Motor Stack
Choosing the correct motor stack for your drone BLDC outrunner 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.
- Decide on Assembly Method — Interlocked stacks are economical; bonded or welded stacks offer better performance and rigidity.
- Consider 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 — Motor Stack Parameters
Q1: What is the difference between a motor stack and a stator core?
A: A motor stack refers to the assembled laminated core, whether for the stator or the rotor. A stator core is specifically the stationary part that holds the windings. In most drone BLDC outrunner motors, the motor stack refers to the stator stack, which is the stationary core inside the rotating outer bell. The terms are often used interchangeably when discussing the stator assembly.
Source: Reenives engineering team, based on motor design terminology.
Q2: What lamination thickness do you recommend for high-RPM drone BLDC outrunner 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 motor stacks?
A: Our standard motor stacks 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 motor stacks?
A: Yes. We use imported epoxy powder coating equipment to apply a uniform, pinhole-free insulation layer on individual laminations before stacking. 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 motor stacks for my specific drone BLDC outrunner motor?
A: Absolutely. We support private mould development. Provide us with your required outer diameter, inner diameter, stack length, slot number, tooth profile, and assembly method. Our R&D team will design and produce custom motor stacks 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 motor stacks?
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 Motor Stack Quote Today
Ready to Improve Your Drone BLDC Outrunner Motor Performance?
Reenives is a drone BLDC outrunner motor stack supplier with 4 years of manufacturing experience, 100+ R&D patents, and 3 production bases. We serve 1000+ enterprises worldwide with high-precision motor stacks 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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