In modern industry, generators serve as the “heart” of energy systems—their performance directly influences the efficiency of energy conversion. As global energy efficiency standards rise (e.g., IEC 60034-30-1’s mandates for IE4/IE5 efficiency levels), material innovation has become a key driver of advancements in generator technologies. Among numerous material upgrades, Cold Rolled Non-Grain Oriented Silicon Steel (CRNGO) has emerged as a critical enabler due to its low magnetic anisotropy (<10%) and excellent magnetic properties. Its random grain orientation technology effectively mitigates multi-dimensional magnetic path losses in rotating machines. This article explores CRNGO’s technical characteristics and its application in next-generation generators.
Generator Structure and Working Principle
Generators convert mechanical energy into electrical energy and consist mainly of a stator and rotor. The stator is fixed within the casing, housing both windings and core; the rotor rotates via bearings and is powered by either permanent magnets or electromagnetic coils. When an external current is applied, a rotating magnetic field is formed between the rotor and stator. Using the principle of electromagnetic induction, this setup transforms mechanical input into electricity.
Crucially, the three-dimensional rotating magnetic field imposes stringent demands on the core material: it must sustain high magnetic flux density while minimizing losses across multiple directions. CRNGO addresses these challenges through precise control of random grain orientation (anisotropy <10%), which boosts permeability uniformity by over 40% compared to conventional materials—making it ideal for generator operation.
Generator core structure
Generator core structure
CRNGO vs CRGO
Parameter | CRNGO | CRGO |
| Magnetic Anisotropy | Low (<10%) | High (>90%) |
| Core Loss Factors | Depends on grade, thickness, flux density (B), and operating temperature | Also influenced by manufacturing processes |
| Magnetic Induction | Measured as B<sub>50</sub> or B<sub>5000</sub> | Measured as B<sub>8</sub> or B<sub>100</sub> |
| Typical Applications | Motors, generators, EV traction motors | Transformers, reactors, inductors |
Global Grade Examples
CRNGO Popular Grades:
China (Baosteel): B15AV1000 (0.15mm), B30AV1500 (1.63T), B35APV1700 (1.68T)
International: JFE JNEH series (0.15mm), ASTM M-45, EN M800-50A, IEC 800-50A
CRGO Popular Grades:
China (Baosteel): B23G110, B27G120, B35G145
International: JIS 30P120, ASTM M-6, EN 120-30P, IEC 110-27P
Technical Breakthroughs in Generator Applications
High-Frequency Response & Ultra-Thin Development
The demand for 0.15mm ultra-thin CRNGO is growing, driven by compact, high-speed and servo motor needs. For instance, Baosteel’s B15AV1000 achieves ≤10.0 W/kg loss at 50Hz, 1.6T—ideal for transformers, motors, and generators.Low Core Loss + High Magnetic Flux Balance
High-flux steel is critical for boosting generator efficiency. Baosteel B35APV1700 offers 1.68T induction and ≤17.0 W/kg loss, improving wind turbine system efficiency by 2–3%.
Japan’s 20JNEH1200 (12W/kg) is popular for compact and intermittent-duty motors, especially in EVs.Low Noise and Reliability Optimization
In precision and noise-sensitive applications, low magnetostriction matters. Baosteel B27APV1400 achieves ≤0.94μm/m, cutting mechanical vibration and noise by 5–10dB.
ThyssenKrupp’s M330-35A, with stacking factor ≥0.95, reduces eddy currents and improves stability.
Global Grades and Application Mapping
Country | Grade | Thickness (mm) | Core Loss (W/kg @50Hz) | Magnetic Flux (T) | Typical Application |
| China | Baosteel B20AV1300 | 0.20 | 13W/kg | 1.63 | Electricity, electronics and appliances |
| Japan | 20JNEH1200 | 0.20 | 12 W/kg | 1.62 | Electric motor, transformer and other electrical equipment core |
| Europe | M330-35A (Thyssen) | 0.35 | 3.3 W/kg | 2.9 | Electromagnetic cores |
| USA | M15-24G | 0.36 | 2.4 W/kg | 1.6 | High-frequency motors, compact motors |
| South Korea | 20PNF1500 | 0.20 | 15 W/kg | 1.62 | EV motors, high-frequency electronics, efficient motors |
Application Scenarios and Solutions
Wind Turbines
Challenge: Turbulent airflow changes magnetic flux directions frequently
Solution: Baosteel B35AV1700
Outcome: Annual power output increase of 120,000 kWh over conventional steel
EV Traction Motors
Challenge: High RPM (>20,000) intensifies skin effect
Solution: JFE 20JNEF1500
Outcome: 35% expansion in motor efficiency >97% zone (MAP)
Moopec: Your Trusted Materials Partner
Moopec specializes in high-performance material sourcing and selection services. We offer a full range of CRNGO and CRGO silicon steel grades backed by Baosteel, along with advanced processing capabilities such as lamination, cutting, and punching for generator applications.
What We Offer:
Material Consultation & Technical Support: Expert advice on optimal grade selection based on client needs
Processing & Value-Added Services: In-house lamination, core cutting, and disc stacking services for production readiness
End-to-End Quality Assurance: From raw material procurement to final delivery, with full QC reports
Fast Response & Delivery: Efficient supply chain support for just-in-time delivery and production agility
Our 0.15mm ultra-thin CRNGO achieves ±2μm thickness tolerance—helping customers boost generator power density by 5–8% annually.
