Winding technology and precautions of toroidal transformer winding machine
Compared with E-shaped transformers, toroidal transformers have the advantages of low magnetic leakage, high efficiency, low noise, light weight, small size, and flexibility in shape design. The most prominent is light weight (about 50% of E-shaped transformers). -70%). However, its shortcomings should not be ignored: it has an inrush current that the E-type transformer does not have (hazardous to the power grid), and it is not as convenient to install as the E-type transformer.
The following describes the winding process and main points of the toroidal transformer
1. Winding system
There are two winding methods on the production line: semi-automatic winding machine and automatic winding machine. The semi-automatic winding machine is generally operated by two people, winding the enameled wire on the insulated ring core one by one. In order to make the winding neat and tidy, the pre-embedded groove on the iron core needs to be clamped on the plastic film before winding. The advantage of the semi-automatic winding machine is that it can be manually adapted to the enameled wire of different diameters, but the disadvantage is that the wire package is loose and the volume is slightly larger.
The working process of the ring winding machine is: there is a storage wheel with a split pin on the winding machine (also called a ring shuttle), remove the split pin, insert the iron core from the opening, and align the center of the inner ring of the iron core with the storage wheel. Close the cotter pin on the circumference of the object wheel, store a certain amount of wire on the storage wheel, and then wrap the iron core with the stored wire. At the same time, the transmission mechanism drives the magnetic core to rotate slowly, so that the enameled wire is evenly wound on the magnetic core. In the process of wire storage and winding, the wire storage wheel always runs at high speed through the inner ring of the iron core. After the winding is completed, remove the remaining wires from the storage wheel, open the split pin, and take out the iron core to complete the winding of the wire package.
Due to factors such as different storage wheel groove sizes, the diameter of the enameled wire that can be wound by the winding machine is often specified as a certain range.
2. Insulation lashing
Core insulation-the inner and outer sides of the core are surrounded by insulating paper strips of the same height as the core, and a circle of insulating paper with the same shape as the end face but slightly larger at both ends is required to overlap the insulating paper strips properly, and then the insulating tape The narrow strips are wound around the core from beginning to end. The material and thickness of the above-mentioned bonding material vary according to the insulation grade of different products.
Primary inter-level insulation: The winding method is the same as the core wire insulation, but the difference is that the insulation requirements are higher, and the number or thickness of materials is increased. 220V power supply isolation transformer, with no less than 3 layers of insulation cladding for primary winding.
