Axial Flux Stator: The Future of High-Torque UAV & Robotics Propulsion

Reenives: Global Leading Axial Flux Stator Lamination Supplier

In the race for higher power density and lighter propulsion systems, the Axial Flux Stator represents a paradigm shift for UAVs, eVTOL aircraft, and advanced robotics. Unlike traditional radial flux motors, axial flux designs offer a compact, pancake-like geometry that delivers exceptional torque-to-weight ratios—critical for extending flight times and payload capacities .

However, manufacturing high-performance axial flux stator laminations requires precision stamping, advanced magnetic materials, and tight stack tolerances to minimize eddy current losses at high frequencies. Reenives specializes in producing custom axial flux stator cores that meet the rigorous demands of aerospace-grade drone motors, with low core loss, superior epoxy insulation, and geometries optimized for your specific slot/pole configuration.

⚙️ What is an Axial Flux Stator?

An Axial Flux Stator is a key component of axial flux permanent magnet motors, where the magnetic flux travels parallel to the motor's rotational axis, rather than radially . This design enables a flat, disc-shaped stator that sits face-to-face with a rotor, significantly reducing the motor's axial length while increasing the active magnetic area .

For UAV applications, axial flux stators are typically constructed from thin-gauge silicon steel laminations (0.20mm–0.35mm) stacked and bonded or welded to form a rigid core. The stator may feature segmented or continuous teeth, with each tooth carrying a concentrated winding coil. Advanced manufacturing techniques, such as progressive die stamping and epoxy edge coating, are essential to maintain dimensional accuracy and insulation integrity under high thermal and mechanical stress .

Figure 1: Precision axial flux stator lamination stack with segmented teeth and epoxy coating.

📂 Axial Flux Stator Classifications for BLDC Motors

Selecting the right axial flux stator architecture depends on your application's torque, speed, and packaging constraints. Reenives manufactures four primary series tailored to UAV, robotics, and industrial needs:

• 🔹 Series AF-20 (Ultra-Thin, High-Frequency): 0.20mm laminations with iron loss ≤6.8 W/kg @1.0T/400Hz. Ideal for high-speed FPV drone motors where weight and efficiency are critical .
• 🔹 Series AF-27 (Balanced Performance): 0.27mm silicon steel offering a cost-effective balance of low loss and mechanical strength for mid-size UAVs and robotic actuators.
• 🔹 Series AF-Epoxy (Full Edge Coating): Features a 50-70µm epoxy layer providing anti-corrosion protection and dielectric strength ≥3.0kV, essential for outdoor and agricultural drones.
• 🔹 Series AF-SMC (Soft Magnetic Composite): Advanced 3D flux path design using SMC materials for complex geometries where traditional laminations are impractical .

📊 Technical Parameters & Verified Data

All data is derived from Reenives in-house testing per IEC 60404-2 and verified by independent third-party audits. Our axial flux stator cores consistently deliver superior performance for demanding UAV applications.

🔬 Data Source: Reenives R&D report #AF-2025-01 + ISO 9001:2025 certified production lines.

🤖 Applications: From UAV Propulsion to Advanced Robotics

The unique characteristics of the Axial Flux Stator—high torque density, compact axial length, and excellent thermal performance—make it the preferred choice for next-generation mobility systems .

• UAV Propulsion (FPV, eVTOL, Logistics): Axial stators enable thinner motor designs that fit within wing profiles, reducing drag while delivering high thrust-to-weight ratios. 0.20mm laminations cut eddy current losses by up to 30% at high PWM frequencies.
• Robotic Arms & Collaborative Robots: The pancake form factor allows for direct-drive joints with zero backlash, improving precision and torque control.
• Electric Vehicle Auxiliaries & Pumps: Axial flux motors offer space-efficient solutions for cooling fans, oil pumps, and steering actuators.
• Medical & Surgical Robotics: Low vibration, high torque, and clean operation make axial stators ideal for precise surgical instruments.

Figure 2: Axial flux stator integrated into a high-performance UAV propulsion unit.

🛠️ How to Select the Right Axial Flux Stator Supplier

Choosing an axial flux stator partner requires a focus on precision engineering and material science. Follow this 6-step checklist to ensure you select a supplier capable of delivering reliable, high-performance cores.

1. Evaluate Material Sourcing: Does the supplier use high-grade non-grain oriented (NGO) steel with verified magnetic properties?
2. Inspect Stamping Precision: Request burr height measurements and stack tolerance reports—critical for reducing eddy losses.
3. Verify Coating Capabilities: Ensure epoxy coating is applied uniformly (50-70µm) with dielectric testing to prevent inter-lamination shorts.
4. Check Customization: Can they develop private moulds for unique slot/pole geometries and offer rapid prototyping?
5. Review Certifications: Look for ISO 9001, IATF 16949, and export compliance for global delivery.
6. Assess Supply Chain: Confirm production capacity (e.g., 50,000m² facilities) and raw material traceability.

❓ Frequently Asked Questions (FAQ)

Addressing the core technical concerns of engineers and procurement specialists.

📞 Accelerate Your UAV Project with Reenives

In the competitive world of UAV and robotics, the Axial Flux Stator is the key to unlocking superior performance and efficiency. Reenives combines cutting-edge stamping technology, advanced magnetic materials, and deep application expertise to deliver axial stator cores that exceed industry standards.

From prototype sampling to mass production (MOQ 500 pcs), we provide end-to-end support, including private mould development, FEA electromagnetic simulation, and rigorous quality testing.

🏭 Dongguan Runlu Motor Technology Co., Ltd. – Reenives

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