A high torque outrunner motor stator core is a laminated magnetic structure designed for outrunner BLDC motors that prioritize torque density over maximum RPM. These motors feature an external rotor (the rotor spins outside the stator), allowing a larger diameter to accommodate more magnets and produce significantly higher torque than inrunner motors of similar weight and volume. The stator core — with optimized slot geometry, ultra-thin laminations, and high stacking factor — is the critical component that enables this torque advantage.

Reenives manufactures high-quality high torque outrunner stator cores using non-grain oriented silicon steel (0.15-0.35mm) with advanced C5/C6 epoxy coating — achieving ≤7.5 W/kg core loss and up to 98.6% stacking factor for maximum flux density and thermal efficiency.

Reenives offers high torque outrunner stator cores in multiple configurations to meet diverse high-torque application requirements:

• By Slot/Pole Config: 12N14P (balanced torque/speed, 80-120 kV), 18N20P (high torque density, 60-90 kV), 24N28P (maximum torque, 30-50 kV for heavy-lift) — higher pole counts increase torque per amp and reduce RPM.
• By Material Thickness: 0.15mm (ultra-high performance, minimum eddy loss), 0.20mm (standard high-torque UAV/robotics), 0.27mm (cost-optimized industrial), and 0.35mm (heavy-duty low-frequency applications).
• By Stacking Factor: ≥98.2% standard, ≥98.6% premium bonded core for maximum torque density.
• By Insulation Coating: C5 epoxy (Class H, 180°C) for standard applications; C6 high-thermal-conductivity coating for high-power density motors requiring superior heat dissipation.
• By Slot Geometry: Wide-slot design for thicker copper windings (higher current capacity), trapezoidal slots for optimized flux distribution, and skewed slots for cogging torque reduction.

💡 Reenives specialty: private mould development for custom high-torque outrunner stator geometries — including 18N20P and 24N28P configs for heavy-lift UAVs (20-50kg payload) and high-torque robotic joints.

All parameters validated by Reenives R&D center (ISO 9001:2025 certified) and third-party testing per IEC 60404-2. Reenives' high-torque outrunner cores outperform industry averages by 12-18% in torque density according to independent benchmarking on a 3110 drone motor test platform (12S, 15x5.5 prop).

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

Reenives high torque outrunner stator cores power critical applications across multiple sectors:

• Heavy-Lift UAVs & Agricultural Drones: 18N20P and 24N28P stators for 15-50kg payload, delivering up to 35 N·m/kg torque density with extended hover endurance.
• Robotic Joint Actuators: Compact high-torque cores for collaborative robot arms, humanoid robotics, and exoskeleton joints requiring smooth, high-torque output at low speeds.
• eVTOL & Urban Air Mobility: Aviation-grade stator cores with 0.15mm laminations for maximum efficiency and fault-tolerant designs.
• Industrial Direct-Drive Systems: High-torque outrunner stators for conveyor drives, winches, and rotary tables where gearboxes must be eliminated.
• Electric Vehicle Auxiliary Drives: High-torque motors for e-bike mid-drives and electric motorcycle hub motors.

1. Define torque, speed, and power requirements: For heavy-lift UAVs (15-50kg payload), select 18N20P or 24N28P configurations. For robotic actuators, 12N14P offers balanced performance.
2. Choose lamination material thickness: 0.15mm for maximum torque density and efficiency (premium); 0.20mm for standard high-torque UAV/robotics; 0.35mm for cost-sensitive industrial applications.
3. Select stacking factor and bonding method: Premium bonded cores (≤98.6%) deliver maximum torque density; interlocked cores (≤98.2%) offer cost-effective performance.
4. Specify insulation and environmental protection: C6 high-thermal-conductivity coating for high-power density motors; C5 epoxy for standard outdoor UAVs.
5. Request samples and validation: Reenives delivers first-article inspection reports (FAI) and material certificates. Prototype high-torque outrunner stator samples ready in 7-10 days after design approval.

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