| 变压器铁芯的作用 |
| 添加时间：2018/11/21 16:27:32 浏览次数： |
| 实际的变压器总是在交流状态下工作，功率损耗不仅在线圈的电阻上，也产生在交变电流磁化下的铁芯中。通常把铁芯中的功率损耗叫“铁损”，铁损由两个原因造成，一个是“磁滞损耗”，一个是“涡流损耗”。 Actual transformers always work in AC state, power loss not only occurs in the resistance of coils, but also in the core under alternating current magnetization. Usually the power loss in iron core is called "iron loss", which is caused by two reasons, one is "hysteresis loss" and the other is "eddy current loss". 磁滞损耗是铁芯在磁化过程中，由于存在磁滞现象而产生的铁损，这种损耗的大小与材料的磁滞回线所包围的面积大小成正比。硅钢的磁滞回线狭小，用它做变压器的铁芯磁滞损耗较小，可使其发热程度大大减小。 Hysteresis loss is the iron loss caused by hysteresis in the process of magnetization of iron core. The magnitude of hysteresis loss is proportional to the size of the area surrounded by hysteresis loops. The magnetic hysteresis loop of silicon steel is narrow, and the hysteresis loss of core used as transformer is small, which can greatly reduce its heating degree. 既然硅钢有上述优点，为什么不用整块的硅钢做铁芯，还要把它加工成片状呢？ Since silicon steel has the above advantages, why not use the whole piece of silicon steel as the core, but also process it into sheets? 这是因为片状铁芯可以减小另外一种铁损——“涡流损耗”。变压器工作时，线圈中有交变电流，它产生的磁通当然是交变的。这个变化的磁通在铁芯中产生感应电流。铁芯中产生的感应电流，在垂直于磁通方向的平面内环流着，所以叫涡流。涡流损耗同样使铁芯发热。为了减小涡流损耗，变压器的铁芯用彼此绝缘的硅钢片叠成，使涡流在狭长形的回路中，通过较小的截面，以增大涡流通路上的电阻；同时，硅钢中的硅使材料的电阻率增大，也起到减小涡流的作用。 This is because the sheet iron core can reduce another kind of iron loss, "eddy current loss". When the transformer is working, there is alternating current in the coil, and the flux generated by it is of course alternating. The flux of this change induces an induced current in the core. The induced current in the core is flowing in the plane perpendicular to the direction of the flux, so it is called eddy current. Eddy current loss also causes iron core to heat up. In order to reduce the eddy current loss, the core of transformer is made up of insulated silicon steel sheets, so that the eddy current in the narrow loop can increase the resistance of the eddy current circuit through a smaller cross section. At the same time, the silicon in the silicon steel can increase the resistivity of the material and also play a role in reducing the eddy current. 用做变压器的铁芯，一般选用0．35mm厚的冷轧硅钢片，按所需铁芯的尺寸，将它裁成长形片，然后交叠成“日”字形或“口”字形。从道理上讲，若为减小涡流，硅钢片厚度越薄，拼接的片条越狭窄，效果越好。这不但减小了涡流损耗，降低了温升，还能节省硅钢片的用料。但实际上制作硅钢片铁芯时。并不单从上述的一面有利因素出发，因为那样制作铁芯，要大大增加工时，还减小了铁芯的有效截面。所以，用硅钢片制作变压器铁芯时，要从具体情况出发，权衡利弊，选择最佳尺寸。 As the core of transformer, the cold-rolled silicon steel sheet with thickness of 0.35 mm is usually selected. According to the size of the core, the core is cut into shape sheet, and then overlapped into "day" or "mouth" shape. In theory, if the eddy current is reduced, the thinner the thickness of the silicon steel sheet is, the narrower the spliced strip is, the better the effect is. This not only reduces eddy current loss, reduces temperature rise, but also saves material for silicon steel sheet. But in fact, when making silicon steel sheet iron core, Not only from the above-mentioned advantages, because the production of iron core, to greatly increase the working hours, but also reduce the effective cross-section of iron core. Therefore, when making transformer cores with silicon steel sheets, we should proceed from specific conditions, weigh the advantages and disadvantages, and choose the best size. 变压器是根据电磁感应的原理制成的.在在闭合的铁芯柱上面绕有两个绕组,一个原绕组,和一个副绕组.当原绕组加上交流电源电压时.原饶组流有交变电流,而建立磁势,在磁势的作用下铁芯中便产生交变主磁通,主磁通在铁芯中同时穿过,{交链]一.二次绕组而闭合由于电磁感应作用分别在一、二次绕组产生感应电动势，至于为什么它可以升压和降压呢？那就需要用楞次定律来解释了，感应电流产生的磁通，总阻碍原磁通的变化，当原磁通增加时感应电流的产生的磁通与与原磁通相反, 就是说二次绕组所产生 的感应磁通与原绕组所产生的主磁通相反，所以二次绕组就出现了低等级的交变电压所以铁芯是变压器的磁路部，绕组是变压器的电路部分. The transformer is made according to the principle of electromagnetic induction. There are two windings, one original winding and one secondary winding, winding on the closed core column. When the original winding is added with AC power supply voltage, the current of the original Rao winding has alternating current, and the establishment of magnetic potential will produce alternating main flux in the core under the action of magnetic potential. The main flux is in the core at the same time. Through, {cross-link] primary and secondary windings closed due to electromagnetic induction in the first and second windings respectively generate induced electromotive force, as to why it can boost and buck? Then we need to use Lenz's law to explain that the flux produced by induced current always hinders the change of the original flux. When the original flux increases, the flux produced by induced current is opposite to the original flux, that is to say, the induced flux produced by secondary winding is opposite to the main flux produced by the original winding, so the secondary winding appears low. The grade of alternating voltage, so the core is the magnetic circuit part of the transformer, and the winding is the circuit part of the transformer. |
| 上一页 变压器是根据电磁感应的原理制成的 |
| 下一页 变压器铁芯故障和排除 |
Copyright © 技术支持：遨游网络