Custom Silicon Steel Stamping for High-Performance Motor Laminations
IATF 16949 Certified Partner for Global Tech Leaders including Dyson, DJI, BYD, and Philips. Delivering expert silicon steel stamping solutions, we leverage high-speed progressive dies to produce over 250 million sets of precision stators, rotors, and iron cores annually.
Our Precision Silicon Steel Stamping Capabilities
Precision Manufacturing
Dimensional Tolerance: Up to ±0.01mm for complex motor stator and rotor profiles.
Material Thickness: Ranging from 0.1mm to 0.5mm (Specializing in ultra-thin laminations to minimize eddy current and core loss).
Press & Assembly Capacity: 95+ high-speed automatic presses (25T to 300T) and 85 automatic interlocking machines , optimized for continuous motor core production.
Flatness & Burr Control: Strict burr height control (≤0.015mm) and flatness within 0.03mm to ensure seamless lamination stacking and maximum magnetic efficiency.
Production Excellence
Volume Capacity: From rapid prototyping to mass production of over 250 million sets of motor cores annually.
Quality Assurance: IATF 16949 certified process with 100% CMM, 2D vision inspection, and strict magnetic property verification.
Tooling Life: In-house Carbide Progressive Die design, ensuring stable, high-speed precision for up to 100 million strokes without degrading edge quality.
Integrated Supply Chain: One-stop manufacturing from high-speed stamping, auto-interlocking, laser welding, to custom annealing for optimized magnetic performance.
Processing and Surface Treatment Solutions for Stator and Rotor Cores
Optimized Silicon Steel Grades for High-Performance Motor Cores
Selecting the right electrical steel is the most critical step in motor manufacturing. It directly dictates the motor’s core loss, magnetic flux density, and overall energy efficiency. At Yongyuan, we source premium Cold-Rolled Non-Grain Oriented (CRNGO) silicon steel from Tier-1 mills like Baosteel and Shougang. Whether you need standard 0.50mm steel for household appliances or ultra-thin 0.20mm laminations for 100,000+ RPM high-speed motors, our IATF 16949 certified supply chain ensures strictly verified magnetic properties for every batch.
50W470 / M470-50A (0.50mm)
A widely used non-grain oriented silicon steel grade for stator and rotor lamination stamping. It provides a reliable balance of magnetic performance, material cost, and punching stability, making it suitable for household appliance motors, cooling fans, small pumps, and other general-purpose motor applications.
35W300 (0.35mm)
A thinner non-grain oriented silicon steel grade with lower core loss than conventional 0.50mm materials. It is well suited for precision stator and rotor lamination stamping in high-efficiency motors, compact drive systems, brushless motors, and other applications that require improved energy performance and stable punching quality.
35W250 / M250-35A (0.35mm)
A premium non-grain oriented silicon steel grade with lower core loss and strong magnetic performance for precision motor lamination stamping. It is suitable for high-efficiency motors, servo systems, vacuum motors, and other performance-driven applications that require stable punching quality and reliable dimensional consistency.
20CS1500HF (0.20mm)
A high-frequency non-grain oriented silicon steel grade designed for ultra-thin motor lamination stamping. It is suitable for high-speed motors, compact drive systems, precision rotors and stators, and other advanced applications that require reduced core loss, stable punching performance, and reliable dimensional accuracy.
20JNEH1500 / 20JNEH1200 (0.20mm)
Premium ultra-thin non-grain oriented silicon steel grades developed for high-speed and high-efficiency motor lamination stamping. They are suitable for precision stator and rotor cores used in advanced drive systems, compact brushless motors, and other demanding applications that require low core loss, dimensional stability, and consistent punching quality.
20HX1200 Self-Bonding Steel
A premium self-bonding electrical steel designed for adhesive-free motor lamination stack assembly. It is suitable for high-speed rotors and stators, compact drive motors, and other advanced applications that require strong interlayer bonding, reduced vibration, improved dimensional stability, and efficient automated stacking.
AV1200-Z Self-Bonding Steel
A self-bonding silicon steel grade developed for precision bonded motor lamination stacks. It is suitable for high-speed motors, compact drive systems, and advanced stator and rotor assemblies that require secure interlayer bonding, low vibration, stable stack geometry, and efficient automated production.
0.10mm Ultra-Thin Premium Lamination Steel
An ultra-thin high-end electrical steel material developed for extreme high-speed and ultra-precision motor lamination stamping. It is suitable for advanced rotor and stator applications that require minimized core loss, lightweight lamination stacks, excellent dimensional accuracy, and stable performance under very high rotational speeds.
What is silicon steel stamping?
What is Silicon Steel Stamping (Motor Lamination)? Silicon steel stamping (also known as electrical steel stamping) is a highly specialized manufacturing process used to produce motor stators and rotors. It utilizes high-speed mechanical presses and precision progressive dies to punch ultra-thin electrical steel sheets (typically 0.1mm to 0.5mm) into precise 2D laminations. These laminations are then stacked and bonded together (via interlocking, welding, or backlack) to form the magnetic core of electric motors, transformers, and generators.
Advantages of silicon steel laminations
Minimized Core Loss (Eddy Currents): By stamping ultra-thin sheets and applying high-grade insulation coatings (e.g., C4/C5), silicon steel significantly reduces eddy current losses, preventing the motor from overheating at high RPMs.
Optimized Magnetic Permeability: Premium CRNGO silicon steel ensures superior magnetic flux density, maximizing the torque and overall energy efficiency of EV and appliance motors.
High-Speed Mass Production: Unlike solid iron cores, laminated silicon steel can be continuously stamped and auto-interlocked directly inside the progressive die, allowing Yongyuan to produce millions of motor cores cost-effectively.
Challenges of Silicon Steel Stamping (And How We Solve Them)
Rapid Die Wear : Silicon steel is highly abrasive. Yongyuan’s Solution: We build in-house Carbide Progressive Dies , guaranteeing stable ±0.01mm precision for up to 100 million strokes.
Micro-Burrs & Short Circuits : Edge burrs can pierce insulation coatings. Yongyuan’s Solution: Ultra-tight die clearances keep burr heights strictly ≤0.015mm, preventing interlaminar heat generation.
Magnetic Degradation : Mechanical impact reduces magnetic efficiency. Yongyuan’s Solution: In-house Stress-Relief Annealing fully restores the original magnetic permeability of the motor core.
Your Strategic Partner for Silicon Steel Motor Cores
Yongyuan delivers low-core-loss, high-efficiency stator and rotor solutions for global technology leaders.
The Three Pillars
A: Extensive Industry Applications
EV & Automotive: Critical silicon steel cores for EV traction motors, LiDAR systems, and power seats.
Smart Home & Drones: Ultra-thin (0.20mm) stators for 100,000+ RPM hair dryers, robot vacuums, and drone propulsion.
B: Advanced Core Assembly
High-Speed Stacking: 85+ auto-interlocking machines for massive, cost-effective in-die lamination assembly.
Premium Bonding: Precision laser welding and self-bonding (Backlack) for heavy-duty and high-RPM motor cores.
C: Engineering Excellence
Magnetic Optimization: Mastery in 0.10mm-0.50mm CRNGO silicon steel to minimize eddy currents.
IATF 16949 Quality: From carbide die design to stress-relief annealing, ensuring zero-defect magnetic efficiency.
Precision Silicon Steel Stamping Workflow
01. DFM & Carbide Die Design We design custom Carbide Progressive Dies with optimized strip layouts. This maximizes silicon steel utilization, minimizes scrap, and ensures optimal magnetic grain orientation.
02. High-Speed In-Die Interlocking Powered by 95+ presses and 85+ interlocking machines, we stamp and stack laminations directly inside the die. Burr height is strictly controlled under 0.015mm to prevent short circuits.
03. Advanced Core Bonding & Welding For high-RPM and EV motors, we secure stators and rotors using precision Laser Welding or Self-Bonding (Backlack), ensuring they withstand extreme centrifugal forces.
04. Stress-Relief Annealing & Testing Our in-house Stress-Relief Annealing fully restores the core’s magnetic permeability. Every batch undergoes strict core loss testing and 100% CMM inspection.
Why Leading Brands Partner with Yongyuan
Unrivaled Scalability: Powered by 95+ automatic high-speed presses, we deliver an annual capacity of 250 million sets, ensuring stable supply for global appliance giants.
Automotive & Aero Precision: Specializing in lightweight aluminum solutions for LiDAR, Drones, and Power Seat Motors where precision and durability are non-negotiable.
Ultra-clean Finishing: Integrated IATF 16949 supply chain offering Medical-Grade Ultrasonic Cleaning to ensure zero-particle purity for high-end motor kits.
Precision Engineering (±0.01mm): Reliable quality guaranteed by rigorous DFM audits and IATF 16949 systems, meeting the strict tolerances of complex motor assemblies.
Technical Excellence: Engineering Cores for Extreme RPM & EV Motors
01. Ultra-Thin Stamping (0.10mm – 0.20mm) The Challenge: Processing ultra-thin CRNGO steel for drone and high-speed hair dryer motors without warping. The Solution: We utilize specialized carbide dies and precision tension control to maintain absolute flatness (≤0.03mm), ensuring zero deformation for 100,000+ RPM applications.
02. Rotor Concentricity & Dynamic Balance The Challenge: At 100,000 RPM, even a micro-millimeter of rotor misalignment causes catastrophic vibration. The Solution: Our advanced in-die auto-interlocking technology guarantees near-perfect concentricity, significantly reducing the need for secondary dynamic balancing.
03. EV Rotor Structural Integrity The Challenge: EV traction motors generate massive centrifugal forces that can tear standard rotors apart. The Solution: We combine High-Strength (HS) silicon steel with precision laser welding and Backlack (self-bonding) to guarantee absolute structural integrity at peak torque.
Motor Core Quality & Testing Standards
Core Loss & Magnetic Testing: Epstein frame testing for strict permeability control.
Insulation Resistance: Verifying C4/C5 coating integrity to prevent short circuits.
Concentricity Inspection: 100% vision inspection for ±0.01mm rotor accuracy.
Push-Out & Weld Strength: Structural testing for interlocked and laser-welded cores.
IATF 16949 Certified | 250M Annual Capacity
Automotive-Grade Quality (IATF 16949)
Strict IATF 16949 certified process ensuring zero-defect standards for EV traction motors, aerospace, and high-performance micro-motors.
Scalable Capacity: 250M Sets/Year
Powered by 95+ high-speed presses and 85+ auto-interlocking machines, ensuring absolute on-time delivery for orders exceeding 100 million units.
One-Stop Motor Core Supply Chain
Integrating in-house carbide die design, high-speed stamping, auto-interlocking, laser welding, and stress-relief annealing. We handle the complexity so you can focus on motor innovation.
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