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Silicon Steel Sheet: The Unsung Hero of Electrical Engineering

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  Silicon steel sheet , also known as electrical steel, is a specialized low-carbon steel alloy infused with 1% to 5% silicon. Designed primarily for magnetic applications, it stands out as a cornerstone material in modern electrical engineering, thanks to its unique combination of high magnetic permeability, low core loss, and excellent magnetic induction—traits that make it ideal for guiding and amplifying magnetic fields with minimal energy waste. Broadly, silicon steel sheets fall into two main categories: grain-oriented (GO) and non-grain-oriented (NGO). Grain-oriented sheets have their crystal grains aligned in a single direction during manufacturing, maximizing magnetic permeability along that axis. This makes them perfect for static magnetic devices like power transformers, where magnetic fields flow in a fixed path. Non-grain-oriented sheets, by contrast, have randomly oriented grains, ensuring uniform magnetic performance in all directions—ideal for rotating...
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The Lamination Sheet EI Series: Essential Core for High-Efficiency Electromagnetic Equipment

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  The lamination sheet EI series stands as a cornerstone component in modern electromagnetic devices, widely utilized in transformers, inductors, and electric motors. Named for its iconic “E” and “I” shaped steel sheets, this series is engineered to optimize magnetic performance while minimizing energy loss, making it indispensable in power electronics and electrical engineering. Structurally, the EI series consists of two complementary sheet types: the “E” sheet (with three prongs forming a rectangular frame) and the “I” sheet (a flat rectangular strip). When assembled, these sheets interlock to form a closed magnetic circuit— a design that reduces magnetic flux leakage significantly. This modular structure also simplifies production and maintenance: manufacturers can easily stack, align, and secure the sheets without complex machining, cutting down on assembly time and costs. Material-wise, most EI lamination sheets are crafted from silicon steel (also ...
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EI Laminations: Essential Components in Electrical Engineering

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  EI laminations are core components in transformers, motors, and inductors, playing a pivotal role in optimizing electromagnetic efficiency. Named for their alternating “E” and “I” shaped steel sheets, these laminations minimize energy loss while enhancing magnetic flux performance, making them indispensable in modern electrical systems. Constructed primarily from silicon steel (electrical steel), EI laminations leverage the material’s high magnetic permeability and low core loss. Silicon alloying reduces eddy current losses—circulating currents induced by alternating magnetic fields—by increasing electrical resistance. The thin sheets (typically 0.3 to 0.5 mm thick) are coated with insulating layers (e.g., oxide films or varnishes) to further suppress eddy currents between adjacent laminations. Manufacturing involves precision stamping of E and I shapes from steel coils, followed by annealing to relieve stress and refine grain structure, which improves ...
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Electrical Steel Laminations: Key Components in Efficient Electrical Equipment

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  Electrical steel laminations are thin sheets of specialized steel used in the cores of transformers, motors, generators, and other electromagnetic devices. Their primary purpose is to minimize energy losses during the conversion and transmission of electrical power, making them indispensable in modern electrical systems. These laminations are typically made from low-carbon steel alloyed with silicon, which enhances their magnetic properties. Silicon content, usually ranging from 1% to 5%, reduces the material’s electrical conductivity, thereby lowering eddy current losses— a major source of inefficiency in magnetic cores. Another critical feature is the laminations’ thinness, often between 0.1 mm and 0.5 mm. This thin structure, combined with insulating coatings on each sheet, limits the flow of eddy currents to individual laminations, further minimizing energy dissipation. Additionally, many electrical steel laminations are grain-oriented, meaning their...
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Silicon Steel Laminations: The Backbone of Electromagnetic Devices

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  Silicon steel laminations , also known as electrical steel laminations, are crucial components in a wide range of electrical and electronic devices. Made from silicon steel sheets, these laminations play a fundamental role in enhancing the performance of transformers, motors, generators, and other electromagnetic equipment. Silicon steel is a ferrosilicon soft magnetic alloy with an extremely low carbon content, typically around 0.08%, and a silicon content ranging from 0.5% to 4.5%. The addition of silicon to iron brings about several desirable properties. It significantly increases the resistivity of the material, which is essential for reducing eddy current losses. Eddy currents are induced currents that circulate within the core of an electromagnetic device, causing energy dissipation in the form of heat. By raising the resistivity, silicon steel laminations minimize these losses, leading to more efficient operation. Moreover, silicon addition boosts the maximum...
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Electrical Steel Sheet: The Unsung Hero of Modern Electromagnetism

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  Electrical steel sheet , also known as silicon steel, stands as a cornerstone material in the realm of electrical engineering, playing a pivotal role in the efficiency and performance of countless electromagnetic devices. Composed primarily of iron with a small percentage of silicon—typically between 0.5% and 4.5%—this specialized alloy is engineered to minimize energy loss during the magnetization and demagnetization cycles, a critical feature in today’s energy-conscious world.The unique properties of electrical steel sheet stem from its careful manufacturing process. Through a series of rolling and annealing steps, the material develops a grain-oriented structure, where the crystals align in a specific direction. This orientation significantly reduces hysteresis loss, which occurs when the material resists changes in its magnetic field. Additionally, the silicon content increases electrical resistivity, lowering eddy current losses—another major source of energy d...
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From Import Dependency to Self-Reliance: How Harmonic Reducer Made in China Achieved a “Upswing”

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  On the production line of Tesla’s humanoid robot Optimus, a batch of harmonic drive gears made in China are being installed into the robot’s joints. Surprisingly, these key components do not come from the Japanese giants who have long monopolized the market, but are products provided by Chinese enterprises. In the world of industrial and humanoid robots, harmonic drive gears are equivalent to the “joints” of humans. Despite their small size, they are core components determining the movement precision and stability of robots. An average six-axis industrial robot requires 3 harmonic drive gears, while a humanoid robot like Tesla’s Optimus needs 14, accounting for 15%-20% of the entire machine cost. For a long time, this key component market has been monopolized by Japanese enterprises. One Japanese company alone holds 85% of the global market share. Domestic robot manufacturers not only had to pay high costs but also often faced long supply cycles and the...
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