Core laminations are thin, insulated silicon steel sheets stacked to form the magnetic circuit (stator and rotor) in brushless DC motors. For drone propulsion systems, using ultra-thin laminations (0.15mm–0.20mm) drastically reduces eddy current losses at high PWM frequencies (20kHz–50kHz) while maintaining high permeability. Reenives specializes in 0.2mm fully processed non-oriented electrical steel stacks, providing consistent magnetic performance, low hysteresis loss, and a stacking factor exceeding 97% — critical for maximizing torque-to-weight ratio in compact UAV motors.

Each stack features an advanced C5 inorganic insulation coating to withstand high temperatures (220°C continuous) and prevent interlaminar shorts, ensuring reliable operation under aggressive throttle changes and high-altitude low-pressure conditions.

Based on thickness, material grade, stacking method, and coating type, Reenives offers tailored solutions for different power classes and RPM ranges:

• Ultra-Thin Grade (0.15mm – 0.20mm) – Optimal for high-speed UAV motors (>45,000 rpm) and FPV racing drones. 0.2mm flagship grade delivers best loss-reduction vs. mechanical strength balance.
• Standard Thin Grade (0.27mm – 0.35mm) – Suitable for industrial servo motors, e-scooters, and medium-thrust drone applications.
• Stator-Specific Designs: Custom slot geometries, tooth shapes, and back-iron optimization for maximum copper fill.
• Stacking & Bonding Methods: Epoxy bonding (highest stacking factor >97%, reduced vibration), interlocking (riveting), or laser welding – available upon request.
• Insulation Coatings: C3 (organic, 180°C) / C5 (inorganic + semi-organic, 220°C+). For drone motors, C5 recommended for high-altitude corona resistance.

All Reenives core laminations comply with IEC 60404-8-8 and GB/T 2521-2017. Typical parameters for our drone-grade 0.2mm material (tested at 400Hz/1.0T, third-party validated):

Data sources: Reenives in-house laboratory (ISO 17025 accredited) + SGS test report #SGS-EL-26-0317. Batch consistency guaranteed with CpK ≥1.33. Third-party verification available upon request.

Mechanical strength of core laminations meets ASTM E8: tensile strength >385 MPa for 0.2mm material, suitable for high-speed rotation up to 85,000 rpm with appropriate retaining mechanisms.

Our core laminations power a wide range of high-performance electric motors across industries:

• FPV racing drones & heavy-lift industrial UAVs (6S–14S LiPo, 30–90A ESCs) – demanding maximum thrust-to-weight and thermal stability.
• eVTOL prototypes & drone delivery systems – requiring high torque density and minimal iron loss under variable loads.
• Robotic actuators & collaborative robot joints (high precision, low cogging torque).
• High-speed spindles & medical handpieces (up to 100,000 rpm, ultra-low vibration).
• Electric vehicle auxiliary motors (cooling fans, oil pumps, HVAC blowers).

Real-world validation: A leading FPV drone brand replaced generic 0.35mm laminations with Reenives 0.2mm core laminations → +18% flight endurance (hover test from 20.0min to 23.6min), motor case temperature reduced by 22°C at full throttle, and 9% higher peak torque. Data from customer field test (report available under NDA).

To achieve optimal power density and thermal performance in your UAV motor design, follow these engineering steps:

1. Define operating frequency & maximum RPM: Above 15kHz PWM → prioritize 0.20mm or 0.15mm laminations. Reenives provides loss vs. frequency curves for each grade.
2. Calculate core loss budget: Use Steinmetz coefficients (supplied in technical datasheet). Our engineering team offers free simulation support (MotorCAD/Ansys Maxwell).
3. Select stacking & bonding method: For drone motors, epoxy-bonded stacks achieve >97% stacking factor, reduce vibration noise, and improve heat dissipation.
4. Coating selection: C5 inorganic coating is mandatory for high-altitude UAVs (>3000m) to prevent partial discharge and ensure long-term reliability.
5. Custom tooling & prototyping: Reenives supports private mould development (lead time 20–30 days) and provides free samples (up to 50 sets) for qualified R&D projects.

Reenives is a professional drone stator core manufacturer, founded in 2022. It boasts independent research and development technologies, imported stamping & epoxy powder coating equipment production lines plus dust-free production workshops, more than 100 R&D patents, 3 production bases, a factory area of over 50,000 square meters, and a staff size of more than 500. From production to sales, we support bulk purchasing, private mould develop , and samples making , and can provide tailor-made perfect solutions for your production and usage scenarios. With 4 years of manufacturing experience, we have solved the production problems related to the use of stator core in industrial production for more than 1000 enterprises. We can ship globally (with complete export qualifications). Global customers are welcome to consult, visit the factory, and obtain free samples!

✅ Certifications: ISO 9001:2025, IATF 16949 (in progress), RoHS, REACH. Full traceability from raw coil to finished core laminations.