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Stator Core – Precision Electromagnetic Cores for BLDC Drone Motors & UAV Propulsion
Drone motor efficiency lagging? Stator core quality inconsistent? Flight times too short?Thestator core is the electromagnetic heart of every BLDC motor—the laminated silicon steel stack that generates the rotating magnetic field essential for propulsion. As a leading stator core supplier in China, Reenives delivers precision stator cores with 0.2mm ultra-thin silicon steel, 12N14P or 24N22P configurations, burr height < 0.03mm, and epoxy coating—reducing core loss by up to 30%, extending flight times by 8–12%, and maximizing thrust output for FPV racing, UAV logistics, agriculture, and eVTOL applications .
- •What Is a Stator Core?
- •Classification of Stator Cores
- •Technical Specifications & Verified Data
- •Applications: Drones, UAVs, eVTOL & More
- •6-Step Engineering Selection Guide for Stator Cores
- •FAQ: Stator Core Technical Questions
- •Why Reenives – Leading Stator Core Supplier in China
- •Dongguan Runlu Motor Technology Co., Ltd.
What Is a Stator Core?
Astator core is the stationary laminated magnetic circuit of an electric motor or generator. It is made from thin sheets of electrical steel (silicon steel) that are precision-stamped, stacked, and bonded to form a core with teeth that carry copper windings . When energized, the windings create a rotating magnetic field that interacts with the rotor to produce torque .
Why the stator core is critical for motor performance:
- Magnetic flux concentration – The stator core directs and concentrates magnetic flux for optimal torque and efficiency
- Core loss reduction – Thin laminations (0.15–0.20mm) minimize eddy current and hysteresis losses
- Heat dissipation – The stator core acts as a thermal path to transfer heat away from windings
- Structural support – Provides mechanical support for windings and maintains precise air gap geometry
ⓘ Stator core insight:"A high-quality stator core is the single most critical component in a BLDC motor. A 10% reduction in core loss can increase motor efficiency by 5–8%."
Reenives manufactures precision stator cores using imported 0.2mm silicon steel, progressive stamping dies, and automated epoxy powder coating—ensuring optimal magnetic performance for demanding UAV, FPV, and industrial applications .
Classification of Stator Cores
Reenives supplies stator cores across four primary series, tailored to different motor classes and performance requirements:
| Series | Stator OD (mm) | Slot/Pole Configuration | Lamination Thickness | Best For |
|---|---|---|---|---|
| Series A – Micro Drone | 12–20mm | 9N12P | 0.15–0.20mm | Micro drones, tiny whoops, sub-100g UAVs |
| Series B – FPV Racing | 22–30mm | 9N12P, 12N14P | 0.15–0.20mm | 3–5 inch FPV racing drones, freestyle |
| Series C – Mid-Size UAV | 30–50mm | 12N14P, 24N22P | 0.20mm | Logistics drones, camera platforms, agriculture |
| Series D – Heavy-Lift & eVTOL | 50–80mm | 24N22P, 36N30P | 0.20mm | Heavy-lift UAVs, eVTOL, cargo drones |
Stator cores are optimized for different motor sizes and power classes:
- 9N12P (9-slot, 12-pole): Most common for FPV and racing motors—excellent torque, smooth operation
- 12N14P: Near-perfect winding factor (0.933), higher torque density—most popular for UAVs
- 24N22P: High torque, low cogging, ideal for heavy-lift and logistics drones
- 36N30P: Maximum torque density for eVTOL and extreme power applications
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 motor research .
| Parameter | Value / Range (Reenives Standard) | Test Standard / Source |
|---|---|---|
| Stator Outer Diameter | 12–80mm (customizable) | CMM / optical comparator |
| Lamination Material | 35PN210, 35PN250 (Nippon Steel / Baowu) | Material certificates |
| Lamination Thickness | 0.15mm / 0.20mm / 0.27mm / 0.35mm | Micrometer / IEC 60404-2 |
| Core Loss @ 1.0T, 400Hz (0.20mm) | ≤ 8.5 W/kg — 30% lower than 0.35mm | IEC 60404-2 / Reenives R&D |
| Saturation Flux Density Bs | 1.68 – 1.72 T | Epstein frame test |
| Burr Height (max) | < 0.03mm | Optical measurement |
| Epoxy Coating Thickness | 30–60 µm, dielectric > 2.5 kV | ASTM D149 |
| Stacking Factor | ≥ 97.5% | Weight method |
| Concentricity Tolerance | ±0.01mm – ±0.015mm | CMM measurement |
| Slot/Pole Configurations | 9N12P, 12N14P, 24N22P, 36N30P, custom | Reenives design standards |
| Winding Factor (12N14P) | 0.933 (near-perfect) | BLDC winding theory |
| Typical Motor Efficiency | 90–95% (with optimized stator) | IEEE Xplore / FEM simulation |
| Flight Time Improvement | 8–12% (vs. standard 0.35mm stator) | Reenives R&D / field testing |
🔬Data Source: Reenives R&D Report 2024-Q4 + IEC 60404-2 standard + Material certificates + IEEE Xplore motor studies .
Applications: Drones, UAVs, eVTOL & More
Stator cores power the full spectrum of motor applications. The right stator core is essential for each:
| Application | Typical Stator Size | Stator Requirements | Performance Priorities |
|---|---|---|---|
| FPV Racing Drones | 22–30mm | Ultra-thin 0.15mm, high fill factor, low cogging | High RPM, rapid acceleration, responsiveness |
| Freestyle / Cinematic | 22–30mm | 0.20mm, smooth torque, thermal stability | Smooth control, consistent power, cooling |
| Logistics & Delivery | 30–50mm | 0.20mm, high efficiency, durability | Long flight time, payload capacity, reliability |
| Agriculture Spraying | 40–60mm | 0.20mm, corrosion-resistant coating | Heavy payload, dust/chemical resistance, power |
| eVTOL / Air Taxi | 50–80mm | 0.20mm, high power density, reliability | Safety, redundancy, high continuous power |
| Micro / Tiny Whoop | 12–20mm | 0.15mm, ultra-lightweight | Weight reduction, efficiency at low power |
"A high-quality stator core is the foundation of every efficient motor—from drone propulsion to industrial automation."
6-Step Engineering Selection Guide for Stator Cores
For motor designers and procurement engineers, selecting the optimal stator core requires systematic evaluation. Here is a practical 6-step framework:
- Define Motor Class & Performance Requirements – Identify your motor's intended application:
- FPV racing: High RPM, rapid acceleration, lightweight
- UAV logistics: Long flight time, high payload, efficiency
- Agriculture: Heavy lift, dust/chemical resistance, durability
- eVTOL: Safety, redundancy, high continuous power
- Select Stator Outer Diameter – Match motor size to power class:
- 12–20mm: Micro motors, tiny whoops
- 22–30mm: FPV racing, freestyle (most popular)
- 30–50mm: Logistics, agriculture, camera platforms
- 50–80mm: Heavy-lift, eVTOL, cargo drones
- Choose Lamination Thickness – Thinner laminations reduce core loss at high frequencies:
- 0.15mm: Ultimate high-RPM performance, racing motors
- 0.20mm: Optimal balance—most applications
- 0.35mm: Not recommended for high-performance motors
ⓘ"Using 0.20mm silicon steel reduces core loss by approximately 30% compared to 0.35mm—translating to longer flight times."
- Define Slot/Pole Configuration – Match to motor characteristics:
- 9N12P: Most common for FPV—excellent torque and smoothness
- 12N14P: Near-perfect winding factor (0.933)—most popular for UAVs
- 24N22P: High torque, low cogging, heavy-lift applications
- 36N30P: Maximum torque density for eVTOL
- Specify Insulation & Coating – Critical for motor reliability:
- Epoxy powder coating (30–60µm, Class H 180°C)
- Corrosion resistance for agriculture and outdoor operations
- Dielectric strength > 2.5 kV for reliable insulation
- Choose a Leading Stator Core Supplier – Evaluate expertise:
- Experience with stator core designs (9N12P, 12N14P, 24N22P, etc.)
- Ultra-thin lamination capability (0.15–0.20mm)
- Precision stamping: burr < 0.03mm, concentricity ±0.01mm
- Epoxy coating capability for motor environments
- Material certificates and third-party test reports
- Proven track record with motor manufacturers
- Responsive engineering support for motor optimization
FAQ: Stator Core Technical Questions
A stator core is the stationary laminated magnetic circuit of an electric motor, made from thin silicon steel sheets that are precision-stamped, stacked, and bonded. It is critical because: (1) it concentrates magnetic flux for optimal torque and efficiency, (2) thin laminations minimize eddy current and hysteresis losses, (3) it acts as a thermal path to dissipate heat from windings, and (4) it provides structural support for windings and maintains precise air gap geometry .
For BLDC drone motors, the optimal stator core features: 0.20mm (or 0.15mm for racing) silicon steel laminations, 9N12P or 12N14P slot/pole configurations, burr height < 0.03mm, epoxy coating, and stacking factor ≥ 97.5%. The 12N14P configuration delivers a near-perfect winding factor of 0.933 and low cogging torque . These parameters minimize core loss, reduce weight, and maximize efficiency—delivering longer flight times and higher thrust.
Lamination thickness directly impacts core loss. 0.20mm laminations achieve core loss ≤ 8.5 W/kg at 400Hz—approximately 30% lower than conventional 0.35mm material. Thinner laminations reduce eddy current losses at high frequencies, resulting in cooler operation, higher efficiency, and longer motor life. For high-RPM FPV racing motors, 0.15mm laminations provide ultimate performance .
9N12P (9-slot stator, 12-pole rotor) is the most common configuration for FPV racing motors, offering excellent torque-to-weight ratio and smooth operation. 12N14P is the most popular for UAV motors, delivering a near-perfect winding factor of 0.933 and exceptionally low cogging torque . 24N22P is preferred for heavy-lift and logistics UAVs, while 36N30P is used for eVTOL applications.
Burr height is the raised edge left on stamped metal after the punching process. In stator cores, burr height must be maintained below 0.03mm because excessive burrs can: (1) damage enamel insulation on copper windings during assembly, causing short circuits, (2) create localized magnetic saturation points that reduce efficiency, (3) increase core loss through eddy current concentration, and (4) reduce motor reliability. Reenives maintains burr height < 0.03mm through precision progressive stamping dies .
Epoxy powder coating provides three critical functions for stator cores: (1) electrical insulation between laminations to minimize eddy currents and prevent interlaminar shorts, (2) corrosion resistance for operation in humid and demanding environments, and (3) thermal durability up to 180°C (Class H) to withstand the heat generated during high-power operation . The coating thickness (30–60µm) is optimized with dielectric strength exceeding 2.5 kV .
Yes. Reenives supports full customization of stator cores including: stator outer diameter (12–80mm), lamination thickness (0.15–0.35mm), slot/pole configurations (9N12P, 12N14P, 24N22P, 36N30P, custom), stacking height, material grade, and epoxy coating specifications. Private mould development is available for high-volume OEM projects with exclusive design rights—from micro FPV motors to heavy-lift eVTOL propulsion systems.
Why Reenives – Leading Stator Core Supplier in China
Reenives has earned its reputation as a leading stator core supplier in China by combining advanced manufacturing technology with deep expertise in motor design and a reliable global supply chain .
Our Advantages — Stator Core Specialists
- ✅Ultra-Thin Silicon Steel: 0.15–0.20mm laminations reduce core loss by up to 30%—extending motor flight times by 8–12%
- ✅Precision Progressive Stamping: Burr height < 0.03mm, concentricity ±0.01mm, stacking factor ≥ 97.5%
- ✅Wide Range of Configurations: 9N12P, 12N14P, 24N22P, 36N30P, and custom designs
- ✅Full Customization: Private mould development, tailored stator diameters, and custom stack heights
- ✅Trusted Quality Control: IEC 60404-2 testing, third-party verification, and material certificates
- ✅Motor Core Expertise: 4 years of experience with 1,000+ enterprise clients—specializing in motor propulsion
- ✅Global Export Capability: Complete export qualifications with worldwide shipping
- ✅100+ R&D Patents: Continuous innovation in stator core technology
🚁Our stator core promise: Precision electromagnetic cores that deliver longer flight times, higher thrust, and cooler operation. Consistent quality that eliminates rework. Technical support that understands motor design. That's why Reenives is the leading stator core supplier in China .
⚡ Ready to power your motors with high-performance stator cores?
Contact Reenives today for engineering consultation, OEM samples, and competitive global pricing.
📱 WhatsApp: +86-13377741885
Dongguan Runlu Motor Technology Co., Ltd.
Reenives — Professional Drone Stator Core Manufacturer
Founded in 2022, Reenives has rapidly grown into a leading stator core supplier in China for the global UAV, FPV, and industrial motor markets .
Independent R&D Technology · Imported stamping & epoxy powder coating production lines · Dust-free workshops · 4 years of manufacturing experience · Solved stator core challenges for 1,000+ enterprises worldwide—including leading drone motor manufacturers .
From production to sales, we support bulk purchasing,private mould development, and sample making. We provide tailor-made solutions for your specific motor production scenarios—with competitive global pricing, consistent quality, and reliable on-time delivery .
🌐www.reenives-bldcmotor.com | 📧 linda_reenives@163.com | 📱 +86-13377741885
✈️ Global motor manufacturers welcome — consult, visit the factory, or request free samplestoday!
Reenives — Leading Stator Core Supplier in China
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