An outrunner brushless motor stator 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 spins around it. This external-rotor configuration creates a larger diameter rotor, which naturally produces higher torque density. In outrunners, the stator is located on the inside while the rotor surrounds it, allowing the magnet ring to be larger and enabling more magnetic poles for increased torque at lower RPM — making them ideal for drone direct-drive systems.

Reenives manufactures high-quality outrunner brushless stator cores using non-grain oriented silicon steel (0.20mm/0.35mm) with advanced C5 epoxy powder coating — ensuring low core loss (≤8.2 W/kg @400Hz) and high thermal stability for sustained drone operation.

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

• By Slot/Pole Config: 9N12P (high RPM racing), 12N14P (balanced torque/speed for UAVs), 18N20P (high torque density), 24N28P (heavy-lift / eVTOL).
• By Material Thickness: 0.15mm (ultra-high RPM >50,000), 0.20mm (standard high-frequency UAV), 0.27mm, and 0.35mm (general industrial).
• By Insulation Coating: C5 epoxy powder coating (Class H, 180°C) with >4000V dielectric strength.
• By Stacking Method: Interlocking self-bonding, laser welding, or epoxy bonding.

💡 Reenives specialty: private mould development for custom outrunner stator geometries — including skew designs that reduce cogging torque by 30-50% for smoother drone 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. CMQIC Test Report #MQ-25-112. Full batch traceability and material certificates available.

Reenives outrunner brushless 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.
• Commercial UAVs & eVTOL: 12N14P / 18N20P outrunner stators for 15-30kg payload with extended flight endurance.
• Agricultural Spraying Drones: High-torque outrunner stators with C5 epoxy coating offering 500h+ salt spray resistance.
• Industrial BLDC Actuators & Servos: Low-cogging outrunner cores for smooth torque in robotics and automation.
• Fixed-Wing UAVs: Outrunner motors for high-thrust, low-RPM propulsion applications.

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), 0.20mm is optimal.
2. Choose lamination material thickness: 0.15mm for ultra-high RPM >50,000; 0.20mm for standard high-frequency UAV; 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), 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.