Motor Stamping – Precision Laminations for High-Efficiency BLDC Motors

Eddy current losses killing your motor efficiency? Stator core quality inconsistent? Motor stamping is the critical manufacturing process that determines the electromagnetic performance of every BLDC motor. Precision stamping of electrical steel laminations directly impacts iron loss, thermal stability, and overall system efficiency. Reenives delivers high-precision motor stampings with burr height < 0.03mm and ultra-thin 0.2mm silicon steel—reducing core loss by up to 30% for demanding UAV, EV, and robotics applications.

What Is Motor Stamping in BLDC Manufacturing?

Motor stamping is a cold-forming process that uses precision dies and stamping presses to convert electrical steel sheet into laminated cores for motors and generators. The process involves punching, blanking, and shaping thin sheets of silicon steel into stator and rotor laminations—the essential magnetic circuits that enable electromagnetic energy conversion in BLDC motors.

Why laminations instead of solid cores? Solid iron cores generate excessive eddy current losses under alternating magnetic fields. By stacking thin laminations (0.10–0.35mm), electrical resistance increases, cross-sectional area decreases, and eddy current flow is significantly reduced. The addition of silicon to steel further improves magnetic permeability, increases electrical resistance, and reduces hysteresis loss.

ⓘ Key engineering principle: “Instead of a solid iron core, several thin pieces of iron are used to generate higher resistance. The result is fewer eddy currents and lower power loss.”

Classification of BLDC Motor Stampings

Based on motor type, lamination geometry, and application requirements, Reenives supplies motor stampings across four primary categories:

BLDC motor stampings are also categorized by outer diameter range for specific platform compatibility:

• Micro stampings (OD 12–30mm): Micro drones, tiny whoops, sub-20g UAV motors
• Compact stampings (OD 30–50mm): 3–5 inch FPV drones, gimbals, handheld tools
• Mid-size stampings (OD 50–80mm): Heavy-lift drones, eVTOL, robotics, automotive BLDC

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 BLDC motor stamping research.

Applications of BLDC Motor Stamping Across Industries

BLDC motor stampings are foundational to modern electrification. Their applications span from high-speed drone propulsion to heavy-duty industrial systems:

5-Step Engineering Selection Guide for Motor Stampings

For procurement engineers and motor designers, selecting the optimal motor stamping solution requires systematic evaluation. Here is a practical 5-step framework:

1. Define Motor Class & Power Requirements – Determine horsepower, voltage, and RPM:
   • Micro BLDC (<100W): Micro drones, tiny actuators
   • Standard BLDC (100W–1HP): FPV drones, gimbals, pumps
   • High-power BLDC (>1HP): Heavy-lift UAVs, eVTOL, EVs
   • Reference: 48V, 1HP BLDC motor-pump achieves 94.06% efficiency
2. Select Lamination Thickness – Thinner laminations reduce eddy current loss at high frequencies:
   • 0.10mm: Ultra-high-speed (>50,000 RPM), aerospace-grade
   • 0.15–0.20mm: High-performance drone motors – optimal efficiency balance
   • 0.35mm: Cost-sensitive industrial applications with lower RPM

   ⓘ “Using 0.2mm silicon steel reduces iron loss by approximately 30% compared to 0.35mm material.”

3. Evaluate Material Grade & Coating – Higher silicon content improves magnetic permeability:
   • 35PN210 / 35PN250: Premium high-frequency performance
   • 50A470 / 50A600: Cost-effective general industrial use
   • Epoxy coating for insulation, corrosion protection, and dielectric strength
4. Verify Stamping Precision & Quality Control – Critical for motor reliability:
   • Burr height < 0.03mm – protects winding insulation
   • Concentricity ±0.01mm – reduces vibration and noise
   • Stacking factor ≥ 97.5% – maximizes active material utilization
5. Choose a Qualified Stamping Supplier – Evaluate manufacturing capability:
   • Progressive stamping die capability for high-volume production
   • Custom mould development for unique designs
   • Automated coating lines for consistent quality
   • Dust-free workshops and full export documentation

FAQ: BLDC Motor Stamping Technical Questions

Why Reenives for Your Motor Stamping Needs

Reenives combines advanced motor stamping technology with deep expertise in BLDC motor manufacturing. As a Global Leading Drone BLDC Motor Stamping Supplier, we deliver precision laminations that meet the most demanding engineering requirements.

Dongguan Runlu Motor Technology Co., Ltd.

Reenives — Global Leading Drone BLDC Motor Stamping Supplier
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