Author：Date：2025-5-7
Three-dimensional rolled iron core compared with the laminated iron core, there are three obvious improvements in the structure: laminated improved for winding; core column plane arrangement improved for three-dimensional arrangement; core column cross-section shape from the ladder shape to quasi-polygonal. This makes the three-dimensional rolled iron core transformer compared with the stacked iron core transformer has five major advantages.
1, saving materials, reduce costs
Three-dimensional rolled iron core transformer than stacked iron core transformer to save material is determined by the unique structure of the three-dimensional rolled iron core. Three-dimensional rolled iron core of the average length of the three magnetic circuits is significantly shorter than the laminated iron core. Therefore, the weight of three-dimensional rolled iron core is significantly lighter than the weight of laminated iron core, so it saves materials and reduces the cost.
In the same heart column cross-sectional area, the same window height size, the same core column center distance, three-dimensional rolled iron core weight is 20% lighter than the stacked iron core, three-dimensional rolled iron core than stacked iron core to save 20% of the silicon steel strip, reduce the cost of iron core materials by 20%. Three-dimensional rolled iron core silicon steel strip processing into a trapezoidal material belt, the use of sets of cutting method of opening, so no waste generated when opening, no waste of materials. The stacked iron core silicon steel sheet processing process requires punching corners, punching down the corners become waste, resulting in a waste of about 4% of the material. Three-dimensional rolled iron core core column cross-section is polygonal, cross-section filling factor of up to 0.95 ~ 0.96, while the stacked iron core core cross-section is stepped, cross-section filling factor of 0.89 ~ 0.925, so in the same cross-section, three-dimensional rolled iron core winding of the average turns of 2% ~ 3% shorter, thus saving 2% ~ 3% of the copper material.
2, improve performance, reduce loss
Three-dimensional rolled iron core transformer than laminated iron core transformer to improve performance, reduce losses, also by the three-dimensional rolled iron core structure is determined. Specifically, there are two aspects:
(1) due to the weight of three-dimensional rolled iron core than the stacked iron core is significantly lighter, in the process coefficient is the same, silicon steel sheet unit loss is the same case, three-dimensional rolled iron core no-load loss is significantly lower, good performance. Its relationship formula is:
P0=p0-G-K
In
P0 - no-load loss; p0 - silicon steel sheet unit loss; G --- iron core weight; K --- process coefficient
(2) due to the three-dimensional rolled iron core in the manufacturing process after annealing treatment, process coefficient of 1.05 ~ 1.1, and laminated iron core in the manufacturing process is generally not annealed, process coefficient of 1.2 ~ 1.4. In the same silicon steel strip material, the same cross sectional area of the core, the same size of the window height, the same center distance of the core, three-dimensional rolled core transformer than the laminated core transformer no-load losses Down about 30%, no-load current down 70% ~ 80%.
3, reduce noise
Stacked iron core is made of a certain shape of silicon steel sheet stacked according to a certain law. Silicon steel sheet is not close enough, when working under the action of electromagnetic force, vibration, so the noise is bigger. The three-dimensional rolled iron core is made of several kinds of trapezoidal material belt sequential winding and become, silicon steel belt between the closer, when working, vibration is small, low noise. Three-dimensional rolled iron core transformer noise than stacked iron core transformer noise is lower than 7 ~ 10dB.
4, three-phase balance
Due to the stacked iron core transformer three core columns are arranged in plane, so that the three core columns of the magnetic circuit length is not consistent, the middle core columns of the magnetic circuit length is short, the two side columns of the magnetic circuit length than the average length of the magnetic circuit of the middle columns of the magnetic circuit length of more than 20% long, resulting in a large difference between the three core columns of the no-load current, the middle columns of the no-load current is small, two columns of the side of the no-load current is larger, resulting in three-phase unbalance.
Three-dimensional stacked iron core of the three core columns were equilateral triangle arrangement, three core columns of the magnetic circuit length is identical, and short, three core columns of no-load current is equal, thus three-phase balance.