Drone&Robot Inrunner BLDC Motor Stator Lamination Supplier
Inrunner – High-Speed Stator Laminations for Drone & Robot BLDC Motors
Need high-speed, compact motor performance for your drone or robot application? Inrunner BLDC motors feature a rotor that spins on the inside of the stator—delivering higher RPM, compact form factors, and excellent power density for applications where speed and size matter. As a specialist drone and robot inrunner BLDC motor stator lamination supplier, Reenives delivers precision stator cores with 0.2mm ultra-thin silicon steel, burr height < 0.03mm, and epoxy coating—optimized for high-RPM inrunner operation, reducing core loss by up to 30%, and delivering reliable, efficient power for drones, robotics, and industrial applications.
- • What Is an Inrunner BLDC Motor?
- • Classification of Inrunner Stator Cores
- • Technical Specifications & Verified Data
- • Applications: Drones, Robotics, Industrial & More
- • 6-Step Engineering Selection Guide for Inrunner Stators
- • FAQ: Inrunner Motor Technical Questions
- • Why Reenives – Drone & Robot Inrunner BLDC Motor Stator Lamination Supplier
- • Dongguan Runlu Motor Technology Co., Ltd.
What Is an Inrunner BLDC Motor?
An inrunner BLDC motor is a brushless DC motor configuration where the rotor (with permanent magnets) is located on the inside of the stator, and the stator wraps around the outside of the rotor. This "inrunner" configuration is characterized by:
- Higher RPM capability – Inrunners typically spin faster than outrunners of similar size
- Compact form factor – The stator outside the rotor allows for more compact motor designs
- Lower torque at high speed – Optimized for speed rather than low-end torque
- Typical applications – Drones, robotics, industrial motors, high-speed applications
ⓘ Inrunner insight: "Inrunner BLDC motors are the preferred choice for high-speed, compact applications where RPM and power density are more important than low-end torque."
Reenives manufactures precision stator cores for inrunner BLDC motors using imported 0.2mm silicon steel, progressive stamping dies, and automated epoxy powder coating—delivering optimal high-RPM performance for drones, 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 | Typical Applications | Slot/Pole Configuration | Lamination Thickness |
|---|---|---|---|---|
| Series A – Micro Inrunners | 10–20mm OD | Small drones, micro robots | 3N2P, 6N4P | 0.15–0.20mm |
| Series B – Standard Inrunners | 20–50mm OD | Drones, robotics, industrial | 9N6P, 12N8P | 0.20mm |
| Series C – High-Power Inrunners | 50–100mm OD | Heavy-duty robotics, industrial | 18N12P, 24N16P | 0.20–0.27mm |
Inrunner stator cores are optimized for high-RPM operation:
- Ultra-thin laminations (0.15–0.20mm) – Reducing core loss at high frequencies
- Compact slot/pole designs – Enabling high power density
- Precision stamping – Critical for high-speed rotor-stator interaction
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 |
| Configuration | 3N2P, 6N4P, 9N6P, 12N8P, custom | Reenives design standards |
| Material Type | Silicon steel (CRNGO / Non-oriented) | Material certificates / IEC 60404 |
| Common Grades | 35PN210, 35PN250, 20WTG1300 (Nippon Steel / Baowu) | Material certificates |
| Lamination Thickness | 0.15mm / 0.20mm / 0.27mm (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: Drones, Robotics, Industrial & More
Inrunner stator cores power a wide range of high-speed and compact applications:
| Application | Typical Motor Size | Configuration | Performance Priorities |
|---|---|---|---|
| Small Drones / UAVs | 10–20mm stators | 3N2P, 6N4P | High RPM, compact size, efficiency |
| Robotic Actuators | 20–40mm stators | 9N6P, 12N8P | Precision control, compact form factor |
| Industrial Motors | 30–60mm stators | 12N8P, 18N12P | Reliability, power density, speed |
| High-Speed Applications | 20–50mm stators | 6N4P, 9N6P | Maximum RPM, efficiency, reliability |
| Medical Devices | 10–30mm stators | 3N2P, 6N4P | Reliability, precision, compact size |
"Inrunner BLDC motors are the preferred choice for high-speed, compact applications where RPM and power density are more important than low-end torque."
6-Step Engineering Selection Guide for Inrunner Stators
For procurement engineers and motor designers, selecting the optimal inrunner stator core requires systematic evaluation. Here is a practical 6-step framework:
- Define Application & Performance Requirements – Identify your motor's intended use:
- Drones: High RPM, compact size—micro inrunners
- Robotics: Precision control, compact form factor—standard inrunners
- Industrial: Reliability, power density—high-power inrunners
- Select Stator Size & Configuration – Match to motor requirements:
- 3N2P: Ultra-compact, high-speed micro inrunners
- 6N4P: Standard micro inrunner configuration
- 9N6P: Mid-size inrunners for robotics and drones
- 12N8P: High-power inrunners for industrial and robotics
- Choose Lamination Thickness – Thinner laminations reduce core loss at high RPM:
- 0.15mm: Ultimate high-RPM performance, micro inrunners
- 0.20mm: Optimal balance—most inrunner applications
- 0.27mm: High-power inrunners, cost-performance balance
ⓘ "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: Inrunner Motor Technical Questions
An inrunner BLDC motor has the rotor on the inside of the stator, with the stator wrapping around the outside. This configuration is optimized for high RPM, compact form factors, and applications where speed is more important than low-end torque. An outrunner has the rotor on the outside of the stator, delivering higher torque at lower RPM—ideal for direct-drive propeller applications. Inrunners are typically used in drones, robotics, industrial motors, and high-speed applications where size and speed are critical.
For inrunner BLDC motors, the optimal stator lamination features: 0.15–0.20mm silicon steel (thinner for higher RPM), 3N2P to 12N8P slot/pole configurations depending on size, 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 drone and robot applications because: (1) high RPM capability—inrunners spin faster than outrunners of similar size, (2) compact form factor—the stator outside the rotor allows for more compact motor designs, (3) excellent power density—high power output in a small package, (4) suitable for gearbox integration—inrunners are often paired with gearboxes for torque multiplication, and (5) high efficiency at speed—inrunners are optimized for high-speed operation.
The optimal slot/pole configuration for inrunner motors depends on the application and size: (1) 3N2P – ultra-compact, high-speed micro inrunners, (2) 6N4P – standard micro inrunner configuration, (3) 9N6P – mid-size inrunners for robotics and drones, (4) 12N8P – high-power inrunners for industrial and robotics, and (5) 18N12P, 24N16P – high-power, high-torque inrunners for demanding applications. 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 (3N2P, 6N4P, 9N6P, 12N8P, custom), stacking height, material grade (35PN210, 35PN250, 20WTG1300), and epoxy coating specifications. Private mould development is available for high-volume OEM projects with exclusive design rights.
Why Reenives – Drone & Robot Inrunner BLDC Motor Stator Lamination Supplier
Reenives has earned its reputation as a specialist Drone & Robot Inrunner BLDC 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: 3N2P, 6N4P, 9N6P, 12N8P, and custom designs
- ✅ Compact & High-Speed Focus: Optimized for drone, 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 inrunner BLDC motors. Consistent quality that eliminates rework. Engineering support that optimizes your high-speed motor design. That's why Reenives is the trusted drone and robot inrunner BLDC 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 inrunner stator lamination supplier for the worldwide drone, 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 drone and robotics 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 drone and robotics manufacturers welcome — consult, visit the factory, or request free samples today!
Reenives — Drone & Robot Inrunner BLDC Motor Stator Lamination Supplier
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