Jiangyin Centersky Electrical Appliance Co., Ltd

  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...

  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...

  EI laminations , named for their “E” and “I” shapes, are vital in electromagnetic devices for optimizing magnetic flux and energy transfer. Crafted from 0.35–0.5 mm silicon steel sheets, their stacked structure with insulated layers minimizes eddy current losses, a key factor in device efficiency. How They Work When AC flows through a winding, EI cores—with high magnetic permeability—channel alternating magnetic fields. This induces voltage in secondary windings per Faraday’s law, ensuring efficient energy transfer with minimal flux leakage. The laminated design prevents conductive loops, reducing heat loss and boosting performance. Material & Manufacturing Silicon steel (2–4% Si) is preferred for its high permeability and low resistivity, balancing flux transfer and eddy current reduction. Manufacturing involves: 1. Cutting/Stamping: Precision dies form “E”/”I” shapes from silicon steel sheets. 2. Annealing: Heating relieves stress and realigns magnetic...