Laminated cores play a crucial role in electrical equipment. They are made by stacking thin silicon steel sheets or ferroalloy sheets and insulating them from each other. Its main purpose is to reduce eddy current losses and improve equipment efficiency. Take a transformer as an example. When alternating magnetic flux passes through the core, an induced electromotive force is generated. If the core is solid, a large eddy current will be formed, resulting in energy loss and core heating. The laminated core divides the core into thin sheets, confining the eddy current within a narrow circuit. The net electromotive force of the circuit is small, and the resistivity of the thin sheet material is high, effectively reducing the eddy current loss. In addition, laminated iron cores can also improve the magnetic field distribution, enhance the electromagnetic performance of the equipment, increase operational stability, and extend the service life of the equipment. In an electric motor, laminated cores are equally important. It helps to reduce energy loss, improve motor efficiency, and enable the motor to convert electrical energy into mechanical energy more efficiently during operation. At the same time, it can also reduce the noise and vibration during the operation of the motor and improve the overall performance of the equipment. In an electric motor, laminated cores are equally important. It helps to reduce energy loss, improve motor efficiency, and enable the motor to convert electrical energy into mechanical energy more efficiently during operation. At the same time, it can also reduce the noise and vibration during the operation of the motor and improve the overall performance of the equipment.

The motor lamination's punch size is given by the design. The following discusses the factors that affect quality in manufacturing when the design remains unchanged. 1. Loss and magnetic permeability of silicon steel sheets The specific loss properties of silicon steel sheets from different manufacturers and different batch numbers from the same manufacturer are not exactly the same. Although there are standard prescribed values, they fluctuate within a certain range. If the amplitude of the fluctuation is relatively large, or the material of the silicon steel sheet itself does not meet the requirements, then the use of such silicon steel sheets on the motor will greatly affect the performance of the motor, especially for medium and large motors, where iron loss accounts for 10% of the loss. The larger the proportion, the more obvious the impact on performance (mainly temperature rise and power factor). This is a hidden danger that is difficult to detect from the electromagnetic design. 2. Silicon steel sheet mold is out of tolerance Silicon steel sheet molds, such as slot punching dies and release molds, have a gap between the punch and the die that gradually increases during use. Some manufacturers are still dealing with production when the mold is out of tolerance, and the consequences are: the punching burrs are significantly increased. If the burr is large, the iron loss and no-load current will increase, causing the temperature rise of the motor to increase, the power factor to decrease, and the efficiency to decrease. 3. Insulation between silicon steel sheets The insulation between silicon steel sheets can suppress the eddy current in the iron core, thereby reducing the resulting eddy current loss (it is included in the iron loss). The insulating layer between chips is formed in the following three ways: (1) Inter-chip insulation composed of the paint film of the cold-rolled silicon steel sheets; (2) The motor manufacturer applies insulating paint on the punched sheets without paint film; (3) The motor manufacturer oxidizes the punched sheets to form an insulating layer .

Recently, we have been exporting ten containers of electrical steel to the transformer and motor manufactures in Vietnam. Container Loading Process Inspection is the final stage gate before export. Today I’ll show you what we do before exporting silicon steel. Silicon steel is also known as electrical steel, lamination steel, or transformer steel, and it’s widely used in large motors, relays, solenoids, appliances’ motors, wind turbines, cores of transformers, EV, etc.   There are several required steps before exporting. 1. Labeling. All the labels are customized according to customer demand. No Chinese labels are allowed to show when it comes to exporting. 2. Container Inspection before loading. Inspection of the inside of the container is essential, small holes that light could go through need to take extra caution. Patches, breakages and holes may cause potential damage of the container after delivery.  3. Consolidation. Strong Wooden pallet and wire rope are used to hold and consolidate the coil. We choose 10x10cm durable square wood as the pallet to hold the coil as well as to further fasten and consolidate the 4 corners of the container. Professional loading team is hired to guarantee the loading is strictly in accordance to the requirement of the shipping company.     After all these are done, the containers will head to the port. Waiting to ship! But that is not the end of the order, we will track closely of the vessel and update latest information with our clients until the container deliver safely.