Regarding "Is silicon steel strong?" In simple terms, the "strong" of silicon steel is more reflected in its electromagnetic properties rather than the mechanical strength against impact as we usually understand it. As a functional material, its mechanical strength is sufficient to meet the processing and usage requirements for its specific purpose, but it is not the core of its design.   The "strong" degree of silicon steel in different dimensions: Mechanical strength (tensile and impact resistance) : In terms of tensile and impact resistance, silicon steel performs moderately weak. Its tensile strength is typically between 370 and 540MPa, which is higher than that of ordinary plastics but far lower than that of specialized structural steels (such as high-strength steel, which can reach over 1000MPa).   Electromagnetic performance "strength" (iron loss, magnetic induction) : In terms of iron loss and magnetic induction, silicon steel demonstrates extremely "strong" and outstanding performance, which is the core value of silicon steel. Low iron loss means high energy conversion efficiency and less heat generation. High magnetic induction can make electrical equipment smaller in size and lighter in weight.   Process performance (adaptability to stamping, shearing and other processing) : In this aspect, silicon steel performs quite well. Silicon steel has certain plasticity, toughness and surface flatness, which can meet the requirements of stamping, shearing and lamination of motor and transformer cores.   A Deep Understanding of the "strong" in Silicon Steel From the above information, it can be seen that to evaluate whether silicon steel is "strong", it is necessary to combine specific scenarios. The core advantage lies in the "high efficiency" and "energy conservation" of electromagnetic performance: The "strength" of silicon steel is mainly reflected in its soft magnetic properties. In an alternating magnetic field, it needs to be easily magnetized and demagnetized, while the energy it consumes (i.e., iron loss) should be as low as possible. This is directly related to the efficiency of transformers and motors. According to statistics, upgrading existing transformers with high-end silicon steel saves nearly as much electricity in a year as the power generation of the Three Gorges Power Station, which shows its significant "strong" contribution in terms of energy conservation.   Mechanical strength is based on the premise of meeting processing and usage requirements: The mechanical strength of silicon steel fully serves its function. Excessive strength or hardness can lead to difficulties in blanking and rapid wear of the die. However, if the strength is too low, it may not be able to ensure that the core maintains structural stability in a high-speed rotating motor. Therefore, its strength is controlled within an appropriate range, capable of withstanding electromagnetic force, centrifugal force and stacking pressure, while also facilitating large-scale and high-precision stamping processing.   The "weak link" to note: Although the overall strength is sufficient, silicon steel, especially cold-rolled silicon steel, is relatively sensitive to processing stress. Shearing, bending and other processing can cause stress and strain to be generated inside the material, which may deteriorate its magnetic properties to a certain extent. Therefore, in some situations with extremely high performance requirements, the completed iron core may need to undergo annealing treatment to eliminate these stresses and restore its best electromagnetic performance.

The punch size of the steel lamination 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.  So they have a large impact on the motor core lamination or the EI lamination. 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 .