A brushless outrunner stator core is the stationary laminated core of an outrunner BLDC motor—a design where the permanent magnet rotor rotates outside the stator electromagnets. The stator is fixed to the motor shaft, while the rotor (an external ring with permanent magnets) spins around it . This external-rotor configuration allows the motor to contain more magnetic poles than would be possible with the smaller diameter of an inrunner design, delivering higher torque at lower RPM . Outrunner motors are characterized by high torque density, smooth operation, and the ability to directly drive propellers without gearboxes—making them the dominant choice for UAV and robotics applications .

Reenives manufactures high-quality brushless outrunner stator cores using non-grain oriented silicon steel (0.15-0.35mm) with advanced C5 epoxy powder coating — ensuring low core loss, high thermal stability, and minimal cogging torque for precision drone and robotics operation .

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

• By Slot/Pole Config: 9N12P (high RPM racing), 12N14P (balanced torque/speed for UAVs and robotics, also known as DLRK), 18N20P (high torque density), 24N28P (heavy-lift / eVTOL) .
• By Material Thickness: 0.15mm (ultra-high RPM >50,000), 0.20mm (standard high-frequency UAV and robotics), 0.27mm, and 0.35mm (general industrial) .
• By Insulation Coating: C5 epoxy powder coating (Class H, 180°C) with >1800V dielectric strength .
• By Stacking Method: Interlocking self-bonding (for thickness ≥0.27mm), laser welding, or epoxy bonding (for ultra-thin laminations below 0.25mm) .

💡 Reenives specialty: private mould development for custom outrunner stator geometries — including skew designs that reduce cogging torque by 30-50% for smoother drone and robot operation .

All parameters validated by Reenives R&D center (ISO 9001:2025 certified) and third-party testing per IEC 60404-2, ASTM A912 .

📐 Data source: Reenives in-house quality lab, 2025–2026. SGS verification report #GZ102505. Full batch traceability and material certificates available .

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

• FPV Racing & Cinematic Drones: 2207, 2306, 2507 outrunner stators with high torque density and instant throttle response. Typical configuration: 12N14P with 0.20mm laminations .
• Commercial UAVs & eVTOL: 12N14P / 18N20P outrunner stators for 15-30kg payload with extended flight endurance .
• Robotic Joint Actuators: Low-cogging outrunner cores for smooth torque in collaborative robot arms, humanoid robotics, and servo modules .
• Agricultural Spraying Drones: High-torque outrunner stators with C5 epoxy coating offering 500h+ salt spray resistance .
• Fixed-Wing UAVs: Outrunner motors for high-thrust, efficient propulsion with direct propeller drive — eliminating gearbox weight and complexity .

1. Define power, torque, and speed requirements: For FPV racing (>40,000 RPM), select 0.15-0.20mm laminations. For heavy-lift UAVs (15,000-25,000 RPM) and robotics actuators, 0.20mm is optimal .
2. Choose lamination material thickness: 0.15mm for ultra-high RPM >50,000; 0.20mm for standard high-frequency UAV and robotics; 0.35mm for robust industrial motors .
3. Select slot/pole combination: 9N12P for high RPM racing, 12N14P for balanced torque/speed (most common for UAVs and robotics), 18N20P for high torque density .
4. Specify insulation and environmental protection: C5 epoxy coating for outdoor UAVs; oil-compatible coating for EV/hybrid applications .
5. Request samples and validation: Reenives delivers first-article inspection reports (FAI) and material certificates. Prototype outrunner 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.