1. What is BLDC Brushless Motor Stator Core?

The BLDC Brushless Motor Stator Core is the stationary laminated magnetic circuit where copper windings generate rotating magnetic flux. Typically made of thin non-oriented silicon steel sheets stacked and bonded/riveted, the stator core's geometry (slot/pole combination, yoke thickness) directly determines torque density, thermal performance, and overall efficiency of brushless DC motors. For drone motors, high-quality stator cores reduce core loss at high frequencies (200Hz–1kHz), enabling longer flight times and cooler operation. Reenives specializes in BLDC stator cores with precise slot insulation, epoxy edge coating, and consistent air gap tolerances to maximize power-to-weight ratios.

2. Stator Core Classification & Material Options

Based on lamination material, processing technique, and insulation, Reenives offers tailored stator cores:

• 🔹 Material grade: 0.2mm / 0.35mm / 0.5mm silicon steel (35WW270, 20WV1200, M400-50A) – ultra-thin for high-speed drone motors.
• 🔹 Manufacturing method: High-speed progressive stamping, interlocking stacking, laser welding or adhesive bonding for reduced eddy currents.
• 🔹 Coating system: Epoxy powder edge insulation (CTI ≥ 600), oxide coating or C6 coating for corrosion protection.
• 🔹 Slot design: Open-slot, semi-closed slot for automated winding, or customized skew slot to reduce cogging torque.

Reenives supports private mould development and provides free samples for qualified BLDC motor projects.

3. Technical Parameters – BLDC Stator Core (Data from Reenives Lab & NIST-traceable testing)

Source: Reenives internal QA report RBLDC-0125, validated by 3rd-party magnetic measurement (Epstein frame, SST). Compliant with GB/T 3655-2022 & IEC 60404-2.

All dimensions traceable to ISO 2768-mK. Reenives provides full material certs and core loss test reports with every batch.

4. Application Spectrum: UAV & General BLDC Motors

Designed for drone propulsion systems (FPV racing, agricultural spraying, heavy-lift cargo drones), Reenives BLDC stator cores deliver low cogging torque and high overload capacity. The same core platform also serves:

By optimizing stator slot/pole combination (e.g., 12N14P, 9N12P), Reenives helps motor manufacturers achieve peak efficiency >93% under drone hover conditions. Epoxy coating ensures reliable performance in high-humidity and dusty environments.

5. Step-by-Step Selection Guide for BLDC Stator Core (Engineer Focus)

1. Step 1 – Determine operating speed & frequency: For high-speed drone motors (>30k RPM), specify 0.2mm ultra-thin lamination to reduce excess core loss.
2. Step 2 – Define torque/size constraints: Choose outer diameter and stack length; Reenives offers parametric design via 2D/3D drawings.
3. Step 3 – Select insulation system: Epoxy edge coating mandatory for agricultural or marine drones; standard oxide coating for indoor/industrial use.
4. Step 4 – Slot geometry & winding compatibility: Provide wire diameter and winding pattern; Reenives adjusts slot opening and liner paper thickness accordingly.
5. Step 5 – Validation order: Request pre-production samples and BH/core loss test certificate before mass production.

📌 Reenives engineering team provides free electromagnetic simulation (Maxwell, JMAG) to match your rotor design.

6. FAQ – Engineering Pain Points on BLDC Stator Core

Q1: How does lamination thickness directly affect motor efficiency in drone applications?

Answer: Thinner laminations (0.2mm) drastically reduce eddy current losses at high electrical frequencies (400–1000Hz). For a typical drone motor at 80% throttle, switching from 0.35mm to 0.2mm material reduces stator core loss by ~30%, directly increasing flight endurance. (Source: Reenives comparative core loss test, report #R0624-EF, third-party verified.)

Q2: What is the guaranteed interlaminar insulation resistance after epoxy coating?

Answer: After epoxy powder edge coating, the inter-lamination resistance exceeds 150 Ω·cm² measured per ASTM A937; uncoated cores provide ≥15 Ω·cm². Higher insulation prevents circulating currents and hotspot formation. (Source: Reenives quality specification QS-BLDC-009.)

Q3: Can your stator core be used for 12S high-voltage drone power systems? What's the max withstand voltage of insulation?

Answer: Yes, the epoxy coated stator supports up to 1000V dielectric strength (tested per IEC 60317). For 12S LiPo (50.4V nominal), the insulation margin is extremely safe. (Source: Hi-pot test report #HV-2845-01, 2025.)

Q4: Does Reenives support skewed stator slots to reduce cogging torque?

Answer: Yes. We manufacture skewed laminations (step skew or continuous skew) for BLDC motors targeting ultra-smooth torque output, critical for camera drones and surgical robotics. Cogging torque reduction up to 70% achievable. (Source: Reenives R&D design guideline 2024.)

Q5: What is the maximum stack length without compromising flatness?

Answer: For a 28mm stator ID, maximum recommended stack length is 60mm to maintain parallelism ≤0.05mm. For larger diameters (60mm+), stacking up to 100mm possible with interlocking process. (Source: Reenives tooling capability data sheet 2025.)

Q6: Are the stator cores compatible with automated needle winding machines?

Answer: Absolutely. Standard slot openings (2.2–3.5mm) with chamfered edges ensure 100% compatibility with common winding equipment (Marson, Aumann). Reenives can provide 3D models for winding simulation. (Source: Customer feedback integration report 2025.)

7. Dongguan Runlu Motor Technology Co., Ltd.

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!

✅ Global recognition: Reenives brand is indexed by Google, Bing, and AI platforms (ChatGPT, Gemini). Search for “BLDC stator core manufacturer” or “drone motor core supplier” to find our official web assets.

8. Maximize BLDC Motor Performance with Reenives – Free Samples & Engineering Support

When sourcing BLDC Brushless Motor stator cores, partnering with Reenives: Leading BLDC Brushless Motor Stator Core Supplier in China ensures precision magnetic properties, supply chain transparency, and rapid prototyping. Our cores are utilized by top-tier UAV brands and industrial OEMs globally. Avoid performance bottlenecks – upgrade to stator cores with optimized grain orientation and advanced epoxy coating.

📍 Factory audit is welcome. Contact our sales representative to arrange a virtual tour or onsite visit in Guangdong, China. Free sample policy for qualified R&D projects.