Electrical Steel Why Choose Silicon Steel
Jun 27, 2023
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The interior of the motor and transformer is mainly composed of copper windings, which are passed by current and generate magnetic fields. The permeability of air is very low, and the permeability loop uses some highly permeability materials as the core of the motor rotor and transformer.
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Demand for electrical steel |
Need context |
Silicon steel characteristic |
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High permeability |
The same current flowing through the winding generates a magnetic field that generates more magnetic induction B than H |
The relative permeability is up to 7000~10000 |
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Coercivity is low |
Coercive force is the width of the magnetic field loop. The lower the coercivity, the thinner the hysteresis loop, the lower the hysteresis loss, and the better the soft magnetic characteristics |
The coercive force of electrical steel is evaluated according to hysteresis loss |
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High resistivity |
The alternating magnetic field will create alternating voltages inside the core, which will create eddy currents and cause heat. If the resistivity of the iron core is higher, the heat generated by the same voltage is lower |
The addition of silicon can improve the resistivity and reduce the eddy current |
Silicon steel, also known as electrical steel or transformer steel, is a specific type of steel alloy that contains silicon as the primary alloying element. It is widely used in the electrical industry due to its unique magnetic properties. Here are some reasons why silicon steel is chosen for electrical applications:
Low core loss: Silicon steel exhibits low core loss, which refers to the energy dissipated as heat when an alternating magnetic field is applied. This low core loss property makes silicon steel an efficient material for electrical transformers and other devices where magnetic fields rapidly change.
High magnetic permeability: Silicon steel has high magnetic permeability, meaning it can be easily magnetized and demagnetized. This property allows for efficient magnetic induction and helps reduce the energy losses associated with magnetic flux in electrical devices.
Low hysteresis loss: Hysteresis loss occurs when the magnetic field changes direction, causing the magnetic domains in a material to realign. Silicon steel has a low hysteresis loss, meaning it retains less energy during this realignment process, resulting in reduced energy losses and improved efficiency.
Excellent electrical resistivity: Silicon steel has high electrical resistivity, meaning it resists the flow of electric current. This property is important in electrical devices to minimize eddy currents, which are circulating currents induced by changing magnetic fields. Lower eddy currents reduce energy losses and improve overall device performance.
Thermal stability: Silicon steel has good thermal stability, enabling it to withstand high operating temperatures without significant loss of its magnetic properties. This feature is crucial for electrical transformers and motors that generate heat during operation.
Cost-effectiveness: Silicon steel is a relatively inexpensive material compared to other electrical steel alloys, making it a cost-effective choice for various electrical applications.
Due to these desirable characteristics, silicon steel is commonly used in electrical transformers, electric motors, generators, inductors, and other devices where efficient energy conversion and minimal energy losses are essential.
