Brushless Inrunner FPV Drone UAV Motor Stator Lamination Supplier
Brushless Inrunner – High-Speed Stator Laminations for FPV Drone & UAV Motors
FPV drone speed limited by motor design? Need high-RPM performance for UAV applications? A brushless inrunner motor features the rotor spinning inside the stator—delivering exceptionally high RPM, compact form factors, and excellent power density for applications where speed matters. As a specialist brushless inrunner FPV drone UAV motor stator lamination supplier, Reenives delivers precision stator cores with 0.2mm ultra-thin silicon steel, 9N6P or 12N8P configurations, burr height < 0.03mm, and epoxy coating—optimized for high-RPM inrunner operation, reducing core loss by up to 30%, and delivering the speed and efficiency demanded by FPV racing, UAV, and robotics applications.
- • What Is a Brushless Inrunner Motor?
- • Classification of Inrunner Stator Cores
- • Technical Specifications & Verified Data
- • Applications: FPV Drones, UAVs, Robotics & More
- • 6-Step Engineering Selection Guide for Inrunner Stators
- • FAQ: Brushless Inrunner Motor Technical Questions
- • Why Reenives – Brushless Inrunner FPV Drone UAV Motor Stator Lamination Supplier
- • Dongguan Runlu Motor Technology Co., Ltd.
What Is a Brushless Inrunner Motor?
A brushless inrunner motor is a brushless DC motor where the rotor (with permanent magnets) is located on the inside of the stator, with the stator wrapping around the outside. This configuration is characterized by:
- Higher RPM capability – Inrunners typically spin significantly faster than outrunners of similar size
- Compact form factor – The stator outside the rotor allows for more compact motor designs
- Excellent heat dissipation – Direct stator-to-housing contact enables effective cooling
- Higher efficiency at speed – Optimized for high-RPM operation with lower iron losses
- Typical configurations – 9N6P (9 slots, 6 poles) and 12N8P (12 slots, 8 poles)
ⓘ Inrunner insight: "Brushless inrunner motors are the preferred choice for high-speed, compact applications where RPM and power density are more important than low-end torque. Recent innovations have overcome historical disadvantages, making inrunners increasingly popular for FPV drones and UAVs."
Reenives manufactures precision stator cores for brushless inrunner motors using imported 0.2mm silicon steel, progressive stamping dies, and automated epoxy powder coating—delivering optimal high-RPM performance for FPV drones, UAVs, robotics, and industrial applications.
Classification of Inrunner Stator Cores
Reenives supplies inrunner stator cores across three primary series, tailored to different applications and performance requirements:
| Series | Stator Size Range | Configuration | Lamination Thickness | Best For |
|---|---|---|---|---|
| Series A – FPV Racing | 20–28mm | 9N6P | 0.15–0.20mm | High-speed FPV drones, racing applications |
| Series B – UAV / Robotics | 28–50mm | 12N8P | 0.20mm | UAVs, robotics, precision control |
| Series C – Custom OEM | Any | Custom | 0.15–0.35mm | Specialized designs, proprietary motors |
Inrunner stator cores are optimized for high-RPM operation:
- 9N6P: High RPM, compact design—ideal for FPV racing drones
- 12N8P: Smooth torque, higher torque density—ideal for UAVs and robotics
- Ultra-thin laminations (0.15–0.20mm) – Reducing core loss at high frequencies
Technical Specifications & Verified Data
All performance data below is derived from Reenives in-house laboratory testing (IEC 60404-2), third-party validation, and industry standards for inrunner stator cores.
| Parameter | Value / Range (Reenives Standard) | Test Standard / Source |
|---|---|---|
| Stator Outer Diameter | 10–100mm (customizable) | CMM / optical comparator |
| Configurations | 9N6P, 12N8P, 3N2P, custom | Reenives design standards |
| Material Type | Silicon steel (CRNGO / Non-oriented) | Material certificates / IEC 60404 |
| Common Grades | 35PN210, 35PN250, 20PN120 (Nippon Steel / Baowu) | Material certificates |
| Lamination Thickness | 0.15mm / 0.20mm (customizable) | Micrometer / IEC 60404-2 |
| Core Loss @ 1.0T, 400Hz (0.20mm) | ≤ 8.5 W/kg — 30% lower than 0.35mm | IEC 60404-2 / Reenives R&D |
| Saturation Flux Density Bs | 1.68 – 1.72 T | Epstein frame test |
| Burr Height (max) | < 0.03mm | Optical measurement |
| Epoxy Coating Thickness | 30–60 µm, dielectric > 2.5 kV | ASTM D149 |
| Stacking Factor | ≥ 97.5% | Weight method |
| Concentricity Tolerance | ±0.01mm – ±0.015mm | CMM measurement |
| Typical Inrunner Efficiency | 88–94% (with optimized stator) | IEEE Xplore / FEM simulation |
| High-Speed Capability | Up to 50,000+ RPM (application-dependent) | Industry benchmarks |
🔬 Data Source: Reenives R&D Report 2024-Q4 + IEC 60404-2 standard + Material certificates + Industry benchmarks.
Applications: FPV Drones, UAVs, Robotics & More
Brushless inrunner stator cores power a wide range of high-speed and compact applications:
| Application | Typical Motor Size | Configuration | Performance Priorities |
|---|---|---|---|
| FPV Racing Drones | 20–28mm stators | 9N6P | High RPM, rapid acceleration, responsiveness |
| High-Speed UAVs | 28–40mm stators | 12N8P | Speed, efficiency, reliability |
| Robotic Actuators | 20–40mm stators | 12N8P | Precision control, compact form factor |
| Industrial High-Speed Motors | 30–60mm stators | 9N6P, 12N8P | Reliability, power density, speed |
| High-Speed Spindles | 20–40mm stators | 9N6P | Maximum RPM, efficiency, reliability |
"Brushless inrunner motors have seen significant technological advances in recent years, overcoming historical disadvantages and becoming increasingly popular for FPV drones, high-speed UAVs, and robotics applications."
6-Step Engineering Selection Guide for Inrunner Stators
For procurement engineers and motor designers, selecting the optimal brushless inrunner stator core requires systematic evaluation. Here is a practical 6-step framework:
- Define Application & Performance Requirements – Identify your motor's intended use:
- FPV racing: High RPM, 9N6P configuration, ultra-thin laminations
- UAV / Robotics: Smooth torque, 12N8P configuration, balanced performance
- Industrial: Reliability, power density—custom configurations available
- Select Configuration – Match to motor requirements:
- 9N6P: High RPM, compact design—ideal for FPV racing drones
- 12N8P: Smooth torque, higher torque density—ideal for UAVs and robotics
- 3N2P: Ultra-compact, high-speed micro inrunners
- Choose Lamination Thickness – Thinner laminations reduce core loss at high RPM:
- 0.15mm: Ultimate high-RPM performance, FPV racing
- 0.20mm: Optimal balance—most inrunner applications
- 0.35mm: Not recommended for high-performance inrunners
ⓘ "0.20mm laminations reduce core loss by approximately 30% compared to 0.35mm—critical for inrunner motor efficiency at high RPM."
- Specify Insulation & Coating – Critical for motor reliability:
- Epoxy powder coating (30–60µm, Class H 180°C)
- Corrosion resistance for demanding environments
- Dielectric strength > 2.5 kV for reliable insulation
- Verify High-Speed Capability – Inrunners demand:
- Ultra-thin laminations for high-frequency operation
- Precision concentricity for stable high-speed rotor-stator interaction
- Robust stacking factor for structural integrity
- Choose a Specialist Inrunner Stator Supplier – Evaluate inrunner motor expertise:
- Experience with inrunner stator design for high-speed applications
- Ultra-thin lamination capability (0.15–0.20mm)
- Precision stamping: burr < 0.03mm, concentricity ±0.01mm
- Epoxy coating capability for inrunner motor environments
- Material certificates and third-party test reports
- Proven track record with inrunner motor manufacturers
- Engineering support for inrunner motor optimization
FAQ: Brushless Inrunner Motor Technical Questions
A brushless inrunner motor has the rotor on the inside of the stator, with the stator wrapping around the outside. Inrunners are optimized for high RPM and compact form factors. An outrunner has the rotor on the outside, delivering higher torque at lower RPM—ideal for direct-drive propeller applications. Inrunners are increasingly used in FPV drones, high-speed UAVs, and robotics due to recent technological advances.
For brushless inrunner motors, the optimal stator lamination features: 0.15–0.20mm silicon steel (thinner for higher RPM), 9N6P or 12N8P slot/pole configurations depending on the application, burr height < 0.03mm, epoxy coating (30–60µm, Class H 180°C), and stacking factor ≥ 97.5%. Ultra-thin laminations are critical for inrunner motors because they operate at higher frequencies than outrunners.
Inrunner motors are used in FPV drone and UAV applications because: (1) high RPM capability—inrunners spin faster than outrunners of similar size, (2) compact form factor—ideal for space-constrained designs, (3) excellent heat dissipation—direct stator-to-housing contact enables effective cooling, (4) higher efficiency at speed—optimized for high-RPM operation, and (5) recent technological advances have overcome historical torque limitations.
The optimal slot/pole configuration for inrunner motors depends on the application: (1) 9N6P – high RPM, compact design for FPV racing drones and high-speed applications, (2) 12N8P – smooth torque, higher torque density for UAVs and robotics, (3) 3N2P – ultra-compact micro inrunners for small drones and medical devices. Reenives supports all these configurations with custom tooling.
Epoxy powder coating provides three critical functions for inrunner stator laminations: (1) electrical insulation between laminations to minimize eddy currents and prevent interlaminar shorts—critical at high RPM, (2) thermal durability up to 180°C (Class H) to withstand the heat generated during high-speed operation, and (3) corrosion resistance for operation in demanding environments. The coating thickness (30–60µm) is optimized with dielectric strength exceeding 2.5 kV.
Yes. Reenives supports full customization of inrunner stator cores including: stator outer diameter (10–100mm), lamination thickness (0.15–0.27mm), slot/pole configurations (9N6P, 12N8P, 3N2P, custom), stacking height, material grade (35PN210, 35PN250, 20PN120), and epoxy coating specifications. Private mould development is available for high-volume OEM projects with exclusive design rights.
Why Reenives – Brushless Inrunner FPV Drone UAV Motor Stator Lamination Supplier
Reenives has earned its reputation as a specialist Brushless Inrunner FPV Drone UAV Motor Stator Lamination Supplier by combining advanced manufacturing technology with deep expertise in high-speed, compact motor design.
Our Advantages — Inrunner Stator Specialists
- ✅ High-RPM Optimized Designs: Stator cores engineered for inrunner applications—maximizing speed and power density
- ✅ Ultra-Thin Silicon Steel: 0.15–0.20mm laminations reduce core loss by up to 30%—critical for inrunner high-frequency operation
- ✅ Precision Progressive Stamping: Burr height < 0.03mm, concentricity ±0.01mm, stacking factor ≥ 97.5%
- ✅ Wide Configuration Range: 9N6P, 12N8P, 3N2P, and custom designs
- ✅ Compact & High-Speed Focus: Optimized for FPV drones, UAVs, robotics, and industrial inrunner applications
- ✅ Full Customization: Private mould development, tailored diameters, and custom specifications
- ✅ Epoxy Coating: 30–60µm, Class H 180°C, dielectric > 2.5 kV
- ✅ Trusted Quality Control: IEC 60404-2 testing, third-party verification, and material certificates
- ✅ Global Export Capability: Complete export qualifications with worldwide shipping to drone, robotics, and industrial manufacturers
- ✅ Proven Track Record: 4 years experience, 1,000+ enterprise clients, 100+ R&D patents
🚁 Our inrunner promise: Stator cores that deliver maximum speed and power density for brushless inrunner motors. Consistent quality that eliminates rework. Engineering support that optimizes your high-speed motor design. That's why Reenives is the trusted brushless inrunner FPV drone UAV motor stator lamination supplier.
🚁 Ready to power your inrunner motors with precision stator cores?
Contact Reenives today for engineering consultation, OEM samples, and competitive global pricing.
📱 WhatsApp: +86-13377741885
Dongguan Runlu Motor Technology Co., Ltd.
Reenives — Professional Drone Stator Core Manufacturer
Founded in 2022, Reenives has rapidly grown into a trusted brushless inrunner stator lamination supplier for the worldwide FPV drone, UAV, robotics, and industrial motor markets.
Independent R&D Technology · Imported stamping & epoxy powder coating production lines · Dust-free workshops · 4 years of manufacturing experience · Solved inrunner stator challenges for 1,000+ enterprises worldwide—including leading FPV drone and UAV manufacturers.
From production to sales, we support bulk purchasing, private mould development, and sample making. We provide tailor-made solutions for your specific inrunner motor production scenarios—with competitive global pricing, consistent quality, and reliable on-time delivery.
🌐 www.reenives-bldcmotor.com | 📧 linda_reenives@163.com | 📱 +86-13377741885
✈️ Global FPV drone and UAV manufacturers welcome — consult, visit the factory, or request free samples today!
Reenives — Brushless Inrunner FPV Drone UAV Motor Stator Lamination Supplier
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