Electric Outrunner Motor – High-Torque Stator Laminations for Direct-Drive Propulsion

Need higher torque without a gearbox? Motor struggling with direct-drive loads? An electric outrunner motor offers superior torque density by placing the rotor on the outside, enabling direct propeller drive without heavy gearboxes. Reenives delivers precision stator laminations for electric outrunner motors with 0.2mm ultra-thin silicon steel, burr height < 0.03mm, and epoxy coating—reducing core loss by up to 30%, maximizing torque density, and enabling smooth, efficient direct-drive propulsion for drones, eVTOL, and industrial applications.

What Is an Electric Outrunner Motor?

An electric outrunner motor is a brushless DC motor configuration where the rotor (with permanent magnets) rotates on the outside of the stator, while the stator core remains stationary at the center. This "outrunner" design allows for larger diameter rotors, which translates to higher torque at lower RPM—ideal for direct-drive propeller applications without the need for gearboxes.

Key advantages of electric outrunner motors:

• High torque density – Large rotor diameter provides mechanical advantage
• Direct drive capability – No gearbox needed; propeller mounts directly to rotor
• Smooth operation – Multi-pole designs reduce cogging torque
• High efficiency – Eliminates gearbox losses
• Compact form factor – Integrated rotor and propeller mount

The stator lamination is the critical component that enables outrunner motor performance. For outrunner motors, stator laminations must:

• Minimize core loss to reduce heat generation at high torque
• Provide high saturation flux density for maximum torque output
• Maintain structural integrity under mechanical and thermal stress
• Ensure precise geometry for consistent air gap and smooth operation

Reenives manufactures precision stator laminations for electric outrunner motors using imported 0.2mm silicon steel, progressive stamping dies, and automated epoxy powder coating—enabling maximum torque density for demanding drone, eVTOL, and industrial applications.

Classification of Outrunner Motor Stator Laminations

Reenives supplies stator laminations across four primary series for electric outrunner motors, tailored to power class and application:

Outrunner motor stator laminations are characterized by:

• Large diameter – Up to 200mm to accommodate high torque requirements
• Multi-pole configurations – 9N12P, 12N14P, 24N22P, 36N30P for smooth torque
• Thin laminations – 0.15–0.20mm to minimize core loss at high frequencies
• High stacking factor – ≥ 97.5% for maximum magnetic material density

Technical Specifications & Verified Data

All performance data below is derived from Reenives in-house laboratory testing (IEC 60404-2), third-party validation, and peer-reviewed electric outrunner motor research.

Applications: Drones, eVTOL, Industrial & More

Electric outrunner motors with precision stator laminations power a wide range of applications:

6-Step Engineering Selection Guide for Electric Outrunner Motor Stator Laminations

For motor designers and procurement engineers, selecting the optimal stator lamination for electric outrunner motors requires systematic evaluation. Here is a practical 6-step framework:

1. Define Power & Torque Requirements – Identify your motor's performance targets:
   • Continuous power: 500W, 5kW, 15kW, 50+ kW?
   • Peak torque: How much overload capacity is needed?
   • Operating RPM range: Low-speed high-torque or high-speed?
2. Select Stator Outer Diameter – Match motor size to power class:
   • 12–22mm: Micro outrunners (<500W)
   • 22–30mm: FPV/racing (500W–3kW)
   • 30–60mm: Mid-power UAV (3–15kW)
   • 60–200mm: High-power/eVTOL (15–50+ kW)
3. Choose Slot/Pole Configuration – Critical for torque and efficiency:
   • 9N12P: Most common for FPV—excellent torque and smoothness
   • 12N14P: Higher torque density for larger drones
   • 24N22P: High torque, low cogging, heavy-lift applications
   • 36N30P: Maximum torque density for eVTOL
   • 48N40P: Ultra-smooth, extreme power applications
4. Specify Lamination Thickness – Thinner laminations reduce core loss at high frequencies:
   • 0.15mm: Ultimate high-RPM performance, racing outrunners
   • 0.20mm: Optimal balance—most outrunner applications
   • 0.35mm: Not recommended for high-performance outrunner motors

   ⓘ "0.20mm laminations reduce core loss by approximately 30% compared to 0.35mm—enabling 15–25% higher torque density."

5. Verify Thermal & Structural Requirements – Outrunner motors demand:
   • High stacking factor (≥ 97.5%) for maximum magnetic material
   • Epoxy coating (30–60µm, Class H 180°C) for thermal durability
   • Strong interlock or welding for structural integrity
   • Precision concentricity (≤ ±0.01mm) for consistent air gap
6. Choose a Specialist Outrunner Stator Supplier – Evaluate expertise:
   • Experience with outrunner motor stator designs (9N12P, 12N14P, 24N22P, etc.)
   • Ultra-thin lamination capability (0.15–0.20mm)
   • Large diameter capability (up to 200mm)
   • Precision stamping: burr < 0.03mm, concentricity ±0.01mm
   • Epoxy coating for outrunner thermal environments
   • Material certificates and third-party test reports
   • Proven track record with outrunner motor manufacturers
   • Engineering support for outrunner motor optimization

FAQ: Electric Outrunner Motor Stator Lamination Questions

Why Reenives – Electric Outrunner Motor Stator Lamination Supplier

Reenives has earned its reputation as a specialist Electric Outrunner Motor Stator Lamination Supplier by combining advanced manufacturing technology with deep expertise in direct-drive propulsion systems.

Dongguan Runlu Motor Technology Co., Ltd.

Reenives — Electric Outrunner Motor Stator Lamination Supplier
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