28mm Inrunner Brushless Motor Stator Core Supplier
28mm Inrunner Brushless Motor – Compact High-Speed Stator Cores for Drone & Robotics
Need a compact, high-speed motor for your drone or robot application? 28mm inrunner efficiency lagging? The 28mm inrunner brushless motor is a popular compact form factor delivering high RPM and excellent power density—ideal for drones, robotics, and industrial applications where size and speed matter. As a specialist 28mm inrunner brushless motor stator core 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 reliable, efficient power for compact drone, robotics, and industrial applications.
- • What Is a 28mm Inrunner Brushless Motor?
- • Classification of 28mm Inrunner Stator Cores
- • Technical Specifications & Verified Data
- • Applications: Drones, Robotics, Industrial & More
- • 6-Step Engineering Selection Guide for 28mm Inrunner Stators
- • FAQ: 28mm Inrunner Motor Technical Questions
- • Why Reenives – 28mm Inrunner Brushless Motor Stator Core Supplier
- • Dongguan Runlu Motor Technology Co., Ltd.
What Is a 28mm Inrunner Brushless Motor?
A 28mm inrunner brushless motor is a brushless DC motor with a 28mm stator diameter and an inrunner configuration—where the rotor spins on the inside of the stator. This compact form factor is widely used in drones, robotics, and industrial applications where high RPM and compact size are essential.
Understanding the 28mm inrunner designation:
- 28mm stator diameter – A compact, mid-size stator for high-speed applications
- Inrunner configuration – Rotor on the inside, stator on the outside—optimized for high RPM
- Common configurations – 9N6P (9 slots, 6 poles) and 12N8P (12 slots, 8 poles)
- Typical applications – Drones, robotics, industrial motors, high-speed applications
ⓘ 28mm inrunner insight: "The 28mm inrunner brushless motor is a popular compact powerplant—delivering high RPM and excellent power density for drones, robotics, and industrial applications."
Reenives manufactures precision stator cores for 28mm inrunner brushless motors using imported 0.2mm silicon steel, progressive stamping dies, and automated epoxy powder coating—delivering optimal high-RPM performance for compact drone, robotics, and industrial applications.
Classification of 28mm Inrunner Stator Cores
Reenives supplies 28mm inrunner stator cores across three primary series:
| Series | Stator Size | Configuration | Lamination Thickness | Best For |
|---|---|---|---|---|
| Series A – High-Speed Drone | 28mm | 9N6P | 0.15–0.20mm | High-speed drones, UAVs |
| Series B – Robotics / Industrial | 28mm | 12N8P | 0.20mm | Robotics, industrial motors |
| Series C – Custom OEM | 28mm | Any configuration | 0.15–0.35mm | Specialized designs, proprietary motors |
28mm inrunner stator cores are optimized for:
- 9N6P: High RPM, compact design—ideal for high-speed drone applications
- 12N8P: Smooth torque, higher torque density—ideal for robotics and industrial
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 28mm inrunner stator cores.
| Parameter | Value / Range (Reenives Standard) | Test Standard / Source |
|---|---|---|
| Stator Outer Diameter | 28mm | CMM / optical comparator |
| Configurations | 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 (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 Motor Efficiency | 88–93% (with optimized 28mm stator) | IEEE Xplore / FEM simulation |
| High-Speed Capability | Up to 40,000+ 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
28mm inrunner stator cores power a wide range of applications:
| Application | Configuration | Battery | Performance Priorities |
|---|---|---|---|
| High-Speed Drones / UAVs | 9N6P | 3S–6S | High RPM, compact size, efficiency |
| Robotic Actuators | 12N8P | 3S–4S | Precision control, compact form factor |
| Industrial Motors | 12N8P | 3S–4S | Reliability, power density, speed |
| High-Speed Spindles | 9N6P | 4S–6S | Maximum RPM, efficiency, reliability |
| Medical Devices | 9N6P | 3S–4S | Reliability, precision, compact size |
"The 28mm inrunner brushless motor is a popular compact powerplant—delivering high RPM and excellent power density for drones, robotics, and industrial applications."
6-Step Engineering Selection Guide for 28mm Inrunner Stators
For procurement engineers and motor designers, selecting the optimal 28mm inrunner stator core requires systematic evaluation. Here is a practical 6-step framework:
- Define Application & Performance Requirements – Identify your motor's intended use:
- High-speed drones: 9N6P, high RPM focus
- Robotics: 12N8P, precision control
- Industrial: 12N8P, reliability and power density
- Select Configuration – Match to motor requirements:
- 9N6P: High RPM, compact design—ideal for high-speed drone applications
- 12N8P: Smooth torque, higher torque density—ideal for robotics and industrial
- Choose Lamination Thickness – Thinner laminations reduce core loss at high RPM:
- 0.15mm: Ultimate high-RPM performance
- 0.20mm: Optimal balance—most 28mm inrunner applications
- 0.35mm: Not recommended for high-performance 28mm inrunners
ⓘ "0.20mm laminations reduce core loss by approximately 30% compared to 0.35mm—critical for 28mm 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 – 28mm 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 28mm Inrunner Supplier – Evaluate inrunner motor expertise:
- Experience with 28mm 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 28mm inrunner motor manufacturers
- Engineering support for 28mm inrunner optimization
FAQ: 28mm Inrunner Motor Technical Questions
A 28mm inrunner brushless motor has a stator diameter of 28mm with the rotor on the inside of the stator. The "28mm" refers to the stator outer diameter—a compact form factor popular in drones, robotics, and industrial applications where high RPM and compact size are essential. Common configurations include 9N6P (9 slots, 6 poles) for high-speed applications and 12N8P (12 slots, 8 poles) for smoother torque in robotics and industrial motors.
For 28mm inrunner motors, the optimal stator lamination features: 0.15–0.20mm silicon steel (thinner for higher RPM), 9N6P or 12N8P configurations, burr height < 0.03mm, epoxy coating (30–60µm, Class H 180°C), and stacking factor ≥ 97.5%. Ultra-thin laminations are critical for 28mm inrunner motors because they operate at higher frequencies than larger motors.
9N6P (9 slots, 6 poles) is optimized for high RPM and is commonly used in high-speed drone and spindle applications. 12N8P (12 slots, 8 poles) provides smoother torque and higher torque density, making it ideal for robotics and industrial applications where precision and smooth operation are more important than maximum RPM. Both configurations are available in the 28mm inrunner size.
28mm inrunner motors typically operate on 3S–6S LiPo batteries, depending on the KV rating and application: (1) 3S–4S – standard operation for robotics and general applications, (2) 4S–6S – high-performance operation for drones and high-speed applications. Always check the motor's specified voltage range and maximum current before selecting a battery.
Epoxy powder coating provides three critical functions for 28mm 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 28mm inrunner stator cores including: stator diameter (28mm standard), lamination thickness (0.15–0.20mm), configurations (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 – 28mm Inrunner Brushless Motor Stator Core Supplier
Reenives has earned its reputation as a specialist 28mm Inrunner Brushless Motor Stator Core Supplier by combining advanced manufacturing technology with deep expertise in compact, high-speed inrunner motor design.
Our Advantages — 28mm Inrunner Stator Specialists
- ✅ 28mm Inrunner Expertise: Compact form factor, high-speed optimized—ideal for drones and robotics
- ✅ Ultra-Thin Silicon Steel: 0.15–0.20mm laminations reduce core loss by up to 30%—critical for 28mm inrunner high-frequency operation
- ✅ Precision Progressive Stamping: Burr height < 0.03mm, concentricity ±0.01mm, stacking factor ≥ 97.5%
- ✅ 9N6P & 12N8P Expertise: Both configurations available—high RPM and smooth torque options
- ✅ Compact & High-Speed Focus: Optimized for drone, robotics, and industrial inrunner applications
- ✅ Full Customization: Private mould development, tailored configurations, 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 28mm inrunner promise: Stator cores that deliver maximum speed and power density for 28mm inrunner motors. Consistent quality that eliminates rework. Engineering support that optimizes your compact, high-speed motor design. That's why Reenives is the trusted 28mm inrunner brushless motor stator core supplier.
🚁 Ready to power your 28mm 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 28mm inrunner stator core 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 28mm 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 28mm 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 — 28mm Inrunner Brushless Motor Stator Core Supplier
© 2026 Dongguan Runlu Motor Technology Co., Ltd. All rights reserved.
Brushless Inrunner FPV Drone UAV Motor Stator Lamination Supplier
Drone&Robot Inrunner BLDC Motor Stator Lamination Supplier
Related Article
