Drone Motor Laminated Rotor Core Supplier
Laminated Rotor Core — Precision Rotor Cores for Drone & BLDC Motors | Reenives Stator Core Supplier
⚠️ Is your laminated rotor core causing high core loss, vibration, or torque ripple? Poor rotor lamination quality, inconsistent stacking, burrs, or a mismatched stator-rotor air gap can reduce motor efficiency, cause overheating, and lead to premature bearing failure — especially in high-RPM drone brushless motors where reliability is mission-critical.
✅ Reenives is a drone motor laminated rotor core supplier producing matched rotor cores and stator cores for brushless motors. With imported high-speed stamping lines, epoxy powder coating, and dust-free workshops, we deliver laminated rotor cores with low core loss, tight tolerances, and consistent stacking. We help 1000+ enterprises worldwide improve motor performance and reliability.
📋 Table of Contents
What Is a Laminated Rotor Core?
A laminated rotor core is the rotating magnetic core of a brushless motor, formed by stacking thin electrical steel laminations together and securing them by interlocking, bonding, welding, or clamping. The rotor core carries permanent magnets (in BLDC motors) and interacts with the rotating magnetic field generated by the stator, producing torque that drives the load — in drones, the propeller.
In drone brushless motors, the laminated rotor core and stator core must be designed and manufactured as a matched pair. Their material grade, lamination thickness, pole count, and air gap directly affect:
- Motor efficiency & flight endurance
- Cogging torque & vibration levels
- Rotor balance & bearing life
- Power density & thrust-to-weight ratio
A well-built laminated rotor core minimizes eddy current losses, provides a stable magnetic path for the magnets, and maintains tight dimensional accuracy for smooth rotation inside the stator bore. For high-RPM drone motors, even a 0.05 mm air gap variation can cause measurable vibration and power loss.
Precision laminated rotor core — manufactured by Reenives with imported high-speed stamping & epoxy powder coating lines.
Types of Laminated Rotor Cores
Laminated rotor cores come in several configurations, each suited to different motor architectures and performance requirements. Reenives manufactures the following types:
- Surface-Mount Rotor Cores — Permanent magnets mounted on the rotor surface. Simple, cost-effective, high flux output. Common in high-torque drone motors.
- Interior Permanent Magnet (IPM) Rotor Cores — Magnets embedded inside the rotor laminations. Higher reluctance torque and better field weakening for high-speed operation.
- Outrunner Rotor Cores — Rotor (outer bell) spins outside the stator. The dominant configuration in drone propulsion for direct propeller mounting.
- Inrunner Rotor Cores — Rotor spins inside the stator. Used in high-RPM ducted fan and EDF applications.
- Interlocked Rotor Cores — Laminations with integral dimples or dovetails that lock together under pressure. Cost-effective for high volume.
- Bonded Rotor Cores — Laminations bonded with adhesive instead of interlocking, reducing eddy current losses and vibration.
- Epoxy-Coated Rotor Cores — Individually coated with epoxy powder for superior insulation and corrosion resistance.
- Custom Rotor Cores — Private mould development for unique diameters, stack lengths, and magnet configurations.
Whether you need a standard 14-pole surface-mount rotor core or a custom IPM design, Reenives can deliver.
Key Specifications & Data
Below are typical specifications for Reenives laminated rotor cores and 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 |
| Rotor Outer Diameter | 10 mm – 180 mm | Matched to stator bore |
| Rotor Inner Diameter | 5 mm – 100 mm | Depends on shaft design |
| Stack Length | 5 mm – 80 mm | Affects torque & power |
| Pole Number | 4, 6, 8, 14, 28, etc. | Matched to slot number |
| Magnet Configuration | Surface-mount / Interior (IPM) | Application dependent |
| 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 |
| Stacking Factor | ≥ 95% | Minimizes air gaps |
Data source: Reenives internal testing & supplier material datasheets, 2024. Actual values may vary by design.
Applications of Laminated Rotor Cores
Reenives laminated rotor cores are used across a wide range of drone and brushless motor applications:
- FPV Racing Drones — High RPM, lightweight rotor cores with low inertia.
- Cinematic & Photography Drones — Smooth, vibration-free rotor cores for stable aerial footage.
- Agricultural Spraying Drones — Corrosion-resistant epoxy-coated rotor cores for harsh chemical environments.
- Industrial Inspection Drones — High-torque rotor cores for long endurance and heavy payloads.
- eVTOL & UAV Propulsion — Custom high-power rotor cores for next-generation air mobility.
- Robot Actuators — Low cogging torque rotor cores for precise motion control.
- EPS Motors — Low NVH rotor cores for automotive electric power steering systems.
- General BLDC Motors — Fans, pumps, power tools, and automotive actuators.
Reenives laminated rotor cores power FPV, agricultural, cinematic, and industrial UAVs worldwide.
How to Select the Right Laminated Rotor Core
Choosing the correct laminated rotor core for your drone motor involves several engineering decisions. Follow these steps:
- Determine Motor Type — Outrunner or inrunner? Outrunner rotor cores spin outside the stator; inrunner rotor cores spin inside. Each has different design requirements.
- Determine Required Torque & RPM — Higher torque needs more stack length or larger diameter. High RPM demands thinner laminations and low-loss material.
- Select Pole/Slot Combination — Common drone motors use 12S/14P or 9S/6P. This must be matched with the stator to ensure proper magnetic interaction.
- 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 rotor cores 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, cogging torque, rotor balance, temperature rise, and mechanical fit.
FAQ — Laminated Rotor Core Parameters
Q1: What is the difference between a surface-mount laminated rotor core and an interior permanent magnet rotor core?
A: A surface-mount rotor core has permanent magnets mounted on the outer surface of the rotor lamination stack. It is simple, cost-effective, and produces strong magnetic flux. An interior permanent magnet (IPM) rotor core embeds the magnets inside the rotor laminations, which provides higher reluctance torque and better field weakening capability for high-speed operation. The choice depends on the motor's torque, speed, and field-weakening requirements.
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 for both rotor and stator cores. 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 laminated rotor cores?
A: Our standard laminated rotor 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: What is the dimensional tolerance and stacking factor of your laminated rotor cores?
A: For critical dimensions such as inner diameter, outer diameter, and magnet slot dimensions, we maintain tolerances of ±0.05 mm. Our laminated rotor cores achieve a stacking factor of ≥ 95%, minimizing air gaps between layers. Tighter tolerances can be achieved upon request with our high-precision stamping lines.
Source: Reenives quality control standards.
Q5: Do you offer epoxy powder coating for laminated rotor cores?
A: Yes. We use imported epoxy powder coating equipment to apply a uniform, pinhole-free insulation layer on individual rotor laminations before stacking. This coating improves corrosion resistance and protects against moisture — critical for agricultural and marine drones. For bonded rotor stacks, we can also apply adhesive bonding instead of interlocking to further reduce eddy current losses.
Source: Reenives production specification.
Q6: Can you develop custom laminated rotor cores for my specific drone motor?
A: Absolutely. We support private mould development. Provide us with your required rotor outer diameter, rotor inner diameter, stack length, pole number, magnet configuration, and any shaft features. Our R&D team will design and produce a matched laminated rotor core and stator core pair tailored to your motor. Tooling lead time is typically 15–25 days.
Source: Reenives custom development process.
Summary — Get Your Laminated Rotor Core Quote Today
Ready to Improve Your Drone Motor Performance with Precision Laminated Rotor Cores?
Reenives is a reliable drone motor laminated rotor core supplier with 4 years of manufacturing experience, 100+ R&D patents, and 3 production bases. We serve 1000+ enterprises worldwide with high-precision laminated rotor cores and 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!
Reenives Runlu Motor Laminated Rotor Core
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