Characteristics and Uses of Low Noise Oriented Silicon Steels

17 Nov 2023
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Characteristics of Low Noise Oriented Silicon Steels:

  1. Grain Orientation: These steels are produced with a highly oriented grain structure, which reduces the magnetostriction effect. Magnetostriction is the phenomenon where the magnetic domains within a material change shape in response to a magnetic field, leading to mechanical vibrations and noise.

  2. Low Core Loss: Low noise oriented silicon steels have low core loss properties. Core loss refers to the energy dissipated as heat within the core material due to alternating magnetic fields. Reduced core loss leads to lower heat generation and improved efficiency.

  3. High Magnetic Permeability: These steels exhibit high magnetic permeability, allowing them to efficiently conduct and channel magnetic flux. This property is crucial for the effective functioning of transformers and other magnetic devices.

  4. Reduced Hysteresis Loss: Hysteresis loss occurs when the magnetic domains in a material align with changing magnetic fields. Low noise silicon steels have minimized hysteresis loss, contributing to lower energy losses and less heat generation.

  5. Silicon Content: These steels have a high silicon content, which enhances their electrical resistivity and magnetic properties.

  6. Surface Insulation: The steels are often coated with a thin insulating layer to reduce eddy current losses, which occur due to circulating currents induced by magnetic fields.

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Uses of Low Noise Oriented Silicon Steels:

  1. Power Transformers: Power transformers are used in electrical grids to step up or step down voltage levels for efficient transmission and distribution of electricity. Low noise oriented silicon steels are employed in the core construction to minimize the audible noise generated during operation.

  2. Distribution Transformers: Similar to power transformers, distribution transformers also benefit from low noise properties, especially when located in residential or noise-sensitive areas.

  3. Electrical Motors: Low noise oriented silicon steels are used in the cores of electrical motors to reduce the noise generated by the alternating magnetic fields during motor operation. This is crucial for applications where quiet operation is essential, such as in household appliances and industrial machinery.

  4. Generators: Electrical generators, particularly those used in critical settings like hospitals or recording studios, benefit from reduced noise emissions, making low noise oriented silicon steels a suitable choice for core construction.

  5. Inductors and Chokes: These materials can also be used in inductors and chokes where noise reduction is desired, especially in applications where electromagnetic interference (EMI) needs to be minimized.


  1. Noise Reduction: The primary advantage of low noise oriented silicon steels is their ability to significantly reduce the audible noise generated by magnetic cores, enhancing the overall acoustic environment.

  2. Energy Efficiency: Their low core loss and hysteresis properties contribute to improved energy efficiency, translating to reduced operating costs.

  3. Reliability: The use of these materials ensures reliable and stable performance of electrical devices while maintaining low noise levels.

  4. Compliance: Low noise silicon steels often meet noise level regulations and standards set by various industries and agencies.

In conclusion, low noise oriented silicon steels offer the crucial benefit of noise reduction in electrical devices while maintaining desirable magnetic and electrical properties. Their use is particularly valuable in applications where quiet operation is essential, making them a vital component in modern electrical systems.

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