In the world of modern industry, generators are the "heart" of energy conversion systems. Their performance plays a critical role in determining overall energy efficiency. As global standards tighten—such as IEC 60034-30-1's mandatory IE4/IE5 efficiency classes—innovation in core materials has become essential for technological advancement in generator design.
Among the most impactful innovations is Cold Rolled Non-Grain Oriented Silicon Steel (CRNGO). Known for its low magnetic anisotropy (<10%) and outstanding magnetic properties, CRNGO is revolutionizing generator technology. By using grain orientation control to create a uniform, randomly distributed crystal structure, this material significantly reduces multi-directional magnetic losses in rotating machines. This article explores the technical strengths of CRNGO and its applications in today’s high-performance generators.
Generator Fundamentals: Structure and Magnetic Challenges
A typical generator consists of a stator and rotor. The stator is stationary, housing windings and a laminated core, while the rotor spins using either permanent magnets or electromagnetic coils. When current is applied, a rotating magnetic field forms between the stator and rotor, converting mechanical energy into electrical energy through electromagnetic induction.
Internal structure of a generator
But this rotating 3D magnetic field imposes strict demands on core materials—they must support high magnetic flux density while minimizing multi-directional losses. CRNGO, with its controlled random grain orientation (anisotropy <10%), enhances magnetic uniformity by over 40% compared to traditional materials, making it ideal for rotating magnetic fields.
CRNGO vs. CRGO: Key Differences
grain-oriented silicon steel
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Feature
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Non-Oriented Silicon Steel (CRNGO)
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Grain-Oriented Silicon Steel (CRGO)
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Magnetic Anisotropy
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Low (<10%)
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High (>90%)
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Core Loss
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The performance depends on factors such as the material grade, thickness, magnetic induction (B value), and operating temperature.
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It depends on factors such as the material grade, thickness, magnetic induction (B value), and manufacturing process.
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Magnetic Induction (B)
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It is typically indicated by B<sub>50</sub> (magnetic induction at 50 A/m) or B<sub>5000</sub> (at 5000 A/m), which are core indicators used to measure its magnetic permeability.
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It is typically expressed as B<sub>50</sub> (magnetic induction at a field strength of 50 A/m) or B<sub>5000</sub> (at 5000 A/m), which are key indicators used to evaluate its magnetic permeability.
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Typical Applications
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Motors, generators, and electric vehicle drive motors | Transformers, reactors, and inductors |
Global CRNGO Grades
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Baosteel: B15AV1000 (0.15mm), B30AV1500 (1.63T), B35APV1700 (1.68T)
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International: JFE JNEH Series (0.15mm), ASTM M-45, EN M800-50A, IEC 800-50A
CRGO Grades (for comparison)
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China: B23G110, B27G120, B35G145
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International: JIS 30P120, ASTM M-6, EN 120-30P, IEC 110-27P
CRNGO: Technological Advancements in Generator Applications
A. High-Frequency Performance and Thin Gauges
With the rise of compact, high-speed motors and servo systems, demand for ultra-thin CRNGO (0.15mm) is growing. Baosteel’s B15AV1000 delivers ≤10.0 W/kg core loss at 50Hz and 1.6T, making it suitable for transformers, motors, and generators.
B. Balancing Low Core Loss and High Magnetic Induction
High-induction silicon steel boosts generator efficiency. For example, Baosteel B35APV1700 (1.68T, ≤17.0W/kg) enhances wind turbine systems with 2–3% efficiency improvements compared to traditional materials.
JFE's 20JNEH1200 (12W/kg) is widely used in compact motors and intermittent-duty AC motors in EVs.
C. Noise Reduction and Reliability
In noise-sensitive applications, magnetostriction becomes a critical factor. Baosteel’s B27APV1400 offers a low magnetostriction value of ≤0.94μm/m, reducing vibration and noise by up to 5–10dB.
M330-35A’s high stacking factor (≥0.95) also minimizes air-gap eddy currents and enhances motor stability over time.
International Grades & Applications at a Glance
| Country |
Grade
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Thickness (mm)
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Core Loss @50Hz
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Induction (T)
| Applications |
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China
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B35AV1700
| 0.35 |
17 W/kg
| 1.64 | Wind turbines, industrial motors |
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Japan
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35JN210
| 0.35 |
2 W/kg
| 1.66 | Motors, generators, appliances |
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Europe
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M330-35A
| 0.35 |
3.3 W/kg
| 2.9 | Electromagnetic core devices |
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USA
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M15-24G
| 0.36 |
2.4 W/kg
| 1.6 | High-frequency, compact motors |
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Korea
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20PNF1500
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0.2
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15 W/kg
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1.62
| EV motors, industrial high-efficiency motors |
Case Studies: CRNGO in Real-World Applications
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Wind Turbines
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Challenge: Turbulent flow causes frequent magnetic flux direction shifts
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Solution: Baosteel B35AV1700
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Result: +120,000 kWh/year vs. traditional steel grades
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EV Drive Motors
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Challenge: Skin effect at >20,000 rpm
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Solution: JFE 20JNEF1500
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Result: Motor efficiency map area >97% expanded by 35%
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Moopec: Your Silicon Steel Partner
At Moopec, we help clients select the right material for their applications. We supply both CRNGO and CRGO products and offer a full range of value-added services including slitting, lamination, and precision cutting—ideal for generator manufacturing needs.
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Material Consultation & Tech Support
We help you choose the optimal silicon steel grade for your design requirements. -
Processing Services
We provide slitting, lamination, and disk stacking services to streamline your production. -
Strict Quality Control
All our silicon steel comes from Baosteel and is backed by rigorous testing and full quality reports. -
Fast Delivery
Our efficient supply chain ensures short lead times and on-time project delivery.
Our 0.15mm ultra-thin CRNGO with ±2μm thickness tolerance helps boost generator power density by 5–8% annually—empowering the next generation of efficient, high-performance power systems.