Cold Rolled Non-Oriented Silicon Steel (CRNGO)

In general, the iron loss of electrical steels can be reduced by adding Silicon (Si) and Aluminum (Al) in the melting-process(1), as these elements increase the electric resistivity and reduce the eddy losses caused by eddy current. Additionally, reducing the thickness of electrical steel also usually contributes to lower eddy losses for high-frequency motors applications. However, the two methods mentioned above will induce some problems, such as the reduction of iron fraction and an increase in the harmful microstructure and texture evolution caused by rolling which causes magnetic flux density to drop seriously.Therefore, there is a need to find ways that are suitable for both iron loss reduction and raising magnetic induction.

Cold rolled Non Oriented Electrical Steel

• High permeability - increased capacity to support magnetic fields
• Low magnetostriction - low tendency to expand or contract in magnetic fields
• High electrical resistivity - lessens the core loss by reducing the eddy current component
• Decreased hysteresis loss - low hysteresis loss means less wasted energy in the form of heat from alternating magnetising force

Non Oriented Silicon Steel Used For
Silicon steels, with their advantageous magnetic performance, are vital in many electrical systems. Below are some of the applications where Silicon steel cores are used:

Rotating machines:

• Electrical vehicle driving motors
• Hermetic motors
• Alternating current (AC) motors
• Intermittent service motors

Static machines:

• Power and distribution transformers
• Reactors and magnetic amplifiers
• Welding transformers
• Audio transformers
• Current transformers
• Magnetic switches and relays
• Electrical ballast