Out-slot
Motor Laminations – Precision Cores for BLDC Drone & Industrial Motors
Motor efficiency lagging due to poor lamination quality? Stator core loss causing overheating?Motor laminations are the precision-stamped silicon steel sheets that form the stator and rotor cores of every electric motor—the essential magnetic circuits that determine efficiency, torque, and thermal performance. As a specialist motor laminations supplier, Reenives delivers precision motor laminations 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%, maximizing motor efficiency, and enabling reliable performance for drone, UAV, robotics, and industrial applications.
- •What Are Motor Laminations?
- •Classification of Motor Laminations
- •Technical Specifications & Verified Data
- •Applications: Drones, UAVs, Robotics, Industrial & More
- •6-Step Engineering Selection Guide for Motor Laminations
- •FAQ: Motor Lamination Technical Questions
- •Why Reenives – Motor Laminations Supplier
- •Dongguan Runlu Motor Technology Co., Ltd.
What Are Motor Laminations?
Motor laminations are precision-stamped thin sheets of electrical steel that form the stator and rotor cores of electric motors, generators, and alternators. These laminated cores are the essential magnetic circuits that enable electromagnetic energy conversion—whether converting electricity to motion (motors) or motion to electricity (generators).
Why motor laminations are essential for motor performance:
- Eddy current reduction – Thin laminations (0.15–0.20mm) restrict eddy current flow, minimizing core loss
- Precision geometry – Stamping ensures consistent slot/pole shapes for optimal magnetic flux
- Burr-free edges – Quality stamping (burr < 0.03mm) protects winding insulation
- High stacking factor – Precision laminations enable ≥ 97.5% stacking density
- Material optimization – Silicon steel increases electrical resistance and magnetic permeability
ⓘ Motor lamination insight:"Motor laminations are the most critical component in electric motors. A 10% reduction in core loss through precision laminations can increase motor efficiency by 5–8%."
Reenives manufactures precision motor laminations using imported 0.2mm silicon steel, progressive stamping dies, and automated epoxy powder coating—delivering optimal magnetic performance for demanding drone, UAV, robotics, and industrial applications.
Classification of Motor Laminations
Reenives supplies motor laminations 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 Motor | 12–20mm | 9N12P | 0.15mm | 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, agriculture, camera platforms |
| Series D – Heavy-Lift & Industrial | 50–80mm+ | 24N22P, 36N30P | 0.20mm | Heavy-lift UAVs, eVTOL, industrial motors |
Motor laminations are optimized for different motor sizes and power classes:
- 9N12P (9-slot, 12-pole): High RPM, responsive—ideal for FPV racing
- 12N14P: Near-perfect winding factor (0.933)—most popular for UAVs
- 24N22P: High torque, low cogging—heavy-lift and logistics
- 36N30P: Maximum torque density—eVTOL and industrial
Technical Specifications & Verified Data
All performance data below is derived from Reenives in-house laboratory testing (IEC 60404-2), third-party validation, and industry standards for motor laminations.
| 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 |
| Typical Motor Efficiency | 90–95% (with optimized laminations) | IEEE Xplore / FEM simulation |
| Efficiency Improvement | 5–8% (vs. standard 0.35mm laminations) | 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, Robotics, Industrial & More
Motor laminations power the full spectrum of electric motor applications:
| Application | Typical Stator Size | Lamination 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 |
| Robotics & Industrial Motors | 20–80mm | 0.20–0.35mm, precision laminations | Precision control, reliability, thermal stability |
"Precision motor laminations are the backbone of electric motor performance—from drone propulsion to industrial automation."
6-Step Engineering Selection Guide for Motor Laminations
For procurement engineers and motor designers, selecting the optimal motor laminations requires systematic evaluation. Here is a practical 6-step framework:
- Define Motor Class & Application – Identify your motor type:
- Drone motors: High RPM, lightweight, efficiency-focused
- UAV motors: Long flight time, payload capacity, reliability
- Robotics: Precision control, smooth torque, reliability
- Industrial: Reliability, thermal stability, cost-effective
- 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, industrial
- 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
- 0.27–0.35mm: Industrial motors, cost-effective
ⓘ"0.20mm laminations reduce core loss by approximately 30% compared to 0.35mm at 400Hz—critical for motor efficiency."
- Define Slot/Pole Configuration – Match to motor characteristics:
- 9N12P: High RPM, responsive—FPV racing
- 12N14P: Near-perfect winding factor—most popular for UAVs
- 24N22P: High torque, low cogging—heavy-lift
- 36N30P: Maximum torque density—eVTOL
- Specify Insulation & Coating – Critical for motor reliability:
- Epoxy powder coating (30–60µm, Class H 180°C)
- Corrosion resistance for outdoor and demanding applications
- Dielectric strength > 2.5 kV for reliable insulation
- Choose a Specialist Motor Lamination Supplier – Evaluate lamination expertise:
- Experience with motor lamination 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
- Engineering support for motor optimization
FAQ: Motor Lamination Technical Questions
Motor laminations are precision-stamped thin sheets of electrical steel that form the stator and rotor cores of motors and generators. They are critical because: (1) laminations minimize eddy current losses by using thin insulated layers instead of a solid core, (2) precision stamping ensures consistent geometry for optimal magnetic flux, (3) burr-free edges protect winding insulation, and (4) high stacking factor maximizes magnetic material density—all of which directly impact motor efficiency, torque, and thermal performance.
The optimal lamination thickness depends on the motor's operating frequency. For high-frequency motors (up to 40 kHz PWM), 0.15–0.20mm laminations are optimal. 0.20mm achieves core loss ≤ 8.5 W/kg at 400Hz—approximately 30% lower than conventional 0.35mm material—delivering longer flight times and cooler operation. For FPV racing motors operating at extreme RPM, 0.15mm laminations provide ultimate performance. 0.35mm is suitable for cost-sensitive industrial motors with lower operating frequencies.
Burr height is the raised edge left on stamped metal after the punching process. In motor laminations, 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.
Motor laminations are produced using progressive stamping dies to punch laminations from electrical steel coils—ideal for high-volume production with low per-unit cost. Laser-cut laminations use fiber lasers to cut laminations—ideal for prototyping, complex geometries, and low-volume production without tooling investment. Stamping offers: (1) lower per-unit cost at high volumes, (2) faster production speeds, (3) consistent quality across millions of parts, and (4) material efficiency. Both methods produce burr-free edges when properly controlled.
Epoxy powder coating provides three critical functions for motor laminations: (1) electrical insulation between laminations to minimize eddy currents and prevent interlaminar shorts, (2) corrosion resistance for operation in humid, outdoor, or demanding environments, and (3) thermal durability up to 180°C (Class H) to withstand heat generated during motor operation. The coating thickness (30–60µm) is optimized for tight slot geometries with dielectric strength exceeding 2.5 kV.
Reenives supports a wide range of slot/pole configurations for motor laminations including: 9N12P (most common for FPV and racing motors), 12N14P (near-perfect winding factor—most popular for UAVs), 24N22P (heavy-lift and logistics), 36N30P (eVTOL and extreme power), and custom configurations for specialized applications. Private mould development is available for high-volume OEM projects with exclusive design rights.
Yes. Reenives supports full customization of motor laminations including: lamination thickness (0.15–0.50mm), material grade (35PN210, 35PN250, 50A470, etc.), outer diameter, slot/pole configurations (9N12P, 12N14P, 24N22P, custom), stacking height, and epoxy coating specifications. Private mould development is available for high-volume OEM projects with exclusive design rights—from micro racing motors to large industrial motors.
Why Reenives – Motor Laminations Supplier
Reenives has earned its reputation as a specialist motor laminations supplier by combining advanced stamping technology with deep expertise in electrical steel and motor applications.
Our Advantages — Motor Lamination Specialists
- ✅Ultra-Thin Silicon Steel: 0.15–0.20mm laminations reduce core loss by up to 30%—extending motor efficiency and life
- ✅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 diameters, and custom stack heights
- ✅Epoxy Coating: 30–60µm, Class H 180°C, dielectric > 2.5 kV
- ✅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 motor lamination technology
🔧Our lamination promise: Precision motor laminations that maximize efficiency and reliability. Consistent quality that eliminates rework. Engineering support that optimizes your motor design. That's why Reenives is the trusted motor laminations supplier.
⚡ Ready to optimize your motor performance with precision laminations?
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 trusted motor laminations supplier for the worldwide drone, UAV, robotics, and industrial motor markets.
Independent R&D Technology · Imported stamping & epoxy powder coating production lines · Dust-free workshops · 4 years of manufacturing experience · Solved motor lamination challenges for 1,000+ enterprisesworldwide.
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 — Motor Laminations Supplier
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