An inrunner BLDC motor stator is the stationary laminated core of an inrunner brushless DC motor—a design where the permanent magnet rotor rotates inside the stator electromagnets . 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 BLDC motor stator cores using non-grain oriented silicon steel (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 25,000 RPM .

Reenives offers inrunner BLDC 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 with integrated passive fans for weight-sensitive UAV applications) .
• By Power Range: 100W – 50kW (customizable). Industry examples include 2kW motors for compact UAVs and 50kW motors for heavy-duty drones and manned systems .
• By Pole Count: Up to 70 poles (35 pole pairs), enabling high torque density and eliminating gearboxes in most applications .
• By Material Thickness: 0.20mm (high-frequency high-RPM UAV), 0.27mm, and 0.35mm (general industrial drives).
• 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 59mm 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. Full batch traceability and material certificates available.

Reenives inrunner BLDC motor stator cores power critical applications across multiple sectors:

• Fixed-Wing UAVs & Multi-Copters: High power-to-weight ratio (best in class) 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 and reduced total cost of ownership .
• Industrial Automation & Robotics: High-speed positioning, conveyor systems, and AGV drives requiring compact motor dimensions and high efficiency .
• Fluid Systems & Pumps: Precise fluid regulation with high efficiency and low maintenance, benefiting from smooth-running inrunner designs .
• 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-3kW), open housing with integrated cooling fans is optimal .
2. Choose lamination material thickness: 0.20mm for high-frequency UAV (40-80kHz PWM) / 0.35mm for robust industrial drives.
3. Select pole count and slot geometry: High pole counts (up to 70) enable gearbox elimination in most applications—reducing system weight and cost .
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.