An inrunner brushless motor stator is the stationary laminated core of an inrunner BLDC motor—a design where the permanent magnet rotor rotates inside the stator electromagnets . In the conventional (inrunner) configuration, the permanent magnets are part of the radially center core, while the stator contains the windings . The stator is built around the rotor and fixed to the motor housing . Compared to outrunners, inrunners feature a much smaller rotor diameter, enabling lower moment of inertia and making them ideal for highly dynamic applications such as multi-copters .

Reenives manufactures high-quality inrunner brushless stator cores using non-grain oriented silicon steel (0.15mm/0.20mm/0.35mm) with advanced C5 epoxy powder coating—ensuring low core loss and high thermal stability for sustained high-RPM operation up to 40,000 RPM .

Reenives offers inrunner brushless stator cores in multiple configurations to meet diverse application requirements :

• By Housing Design: Closed housing (IP54-IP67 rated, rugged for harsh environments) and open housing (lightweight, air-cooled for weight-sensitive UAV applications) .
• By Power Range: 100W – 50kW (customizable) .
• By Material Thickness: 0.15mm (ultra-high RPM, >40kHz PWM), 0.20mm (standard high-frequency UAV), 0.27mm, and 0.35mm (general industrial drives) .
• By Lamination Material: Non-grain oriented (NGO) silicon steel for cost-effectiveness; Cobalt-iron alloys for ultra-high performance aerospace applications .
• By Insulation Coating: C5/C7 epoxy powder coating with >1800V dielectric strength, Class H (180°C) .

💡 Reenives specialty: private mould development for custom inrunner stator geometries—from compact 18mm frame sizes to large 274mm industrial drive stators, with fully customizable cooling channels and IP ratings .

All parameters validated by Reenives R&D center (ISO 9001:2025 certified) and third-party testing per IEC 60404-2 . Performance benchmarks informed by industry-leading inrunner motor specifications .

📐 Data source: Reenives in-house quality lab, 2025–2026. TÜV SÜD third-party report available upon request. Full batch traceability and material certificates available .

Reenives inrunner brushless stator cores power critical applications across multiple sectors :

• Fixed-Wing UAVs & Multi-Copters: High power-to-weight ratio with low inertia for dynamic flight control. Inrunners are preferred for high power requirements such as heavy-duty drones or manned systems .
• Mission-Critical Aerospace: Closed housing designs (IP54-IP67) for operation in desert, snow, and maritime environments with extended MTBS/F .
• Industrial Automation & Robotics: High-speed positioning, conveyor systems, and AGV drives requiring compact motor dimensions and high efficiency .
• Medical Devices & Precision Tools: Low vibration, high-speed spindles for surgical tools and diagnostic equipment .
• Defense & Marine Systems: Corrosion-resistant IP67-rated inrunner motors for UUVs, USVs, and marine propulsion applications .

1. Define power, speed, and environmental requirements: For heavy-duty UAVs (50kW class), select closed housing designs. For weight-sensitive applications (sub-5kW), open housing with integrated cooling is optimal .
2. Choose lamination material thickness: 0.15mm for ultra-high RPM (>40kHz PWM); 0.20mm for standard high-frequency UAV; 0.35mm for robust industrial drives .
3. Select winding configuration: Concentrated winding for high power density and shorter axial length; distributed winding for smoother torque and lower acoustic noise .
4. Specify protection class and customization: IP54 standard for most UAV applications; higher classes (IP67) available for marine and harsh-environment systems .
5. Request samples and validation: Reenives delivers first-article inspection reports (FAI) and material certificates. Prototype stator samples ready in 7-10 days after design approval .

💡 Engineering support: Free DFM within 48h — send your motor spec or drawing to linda_reenives@163.com.