Structure and performance of ring transformer
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Structure and performance of ring transformer
It was found that the eddy current loss (core loss) of the coil wound with the ring-shaped iron core was the smallest, so the iron core of the transformer was processed into a ring shape. The core of the ring transformer is made of cold-rolled silicon steel sheet with a thickness of less than 0.35mm, which is rolled and formed seamlessly. The coil is uniformly wound on the iron core, and the direction of the magnetic field lines generated by the coil and the magnetic circuit of the iron core almost completely coincide, so that the eddy current loss generated by the alternating current passing through the coil is minimized. The core loss of U-type and E-type transformers is reduced by more than 50%, thereby improving the conversion efficiency of voltage transformation or isolation.
The core of the ring transformer can be processed to the extent that there is no air gap, the stacking coefficient can be as high as more than 95%, and the core permeability can be 1.5-1.8t (the laminated core can only be about 1.2t or less), so the electrical conversion efficiency of the ring transformer can reach more than 95%. The airless structure of the core of the ring transformer can make the no-load current very small, and there is no heating phenomenon when it is powered on for a long time.
The space occupied by the length, width and height of the ring transformer is a cylindrical structure, and its volume is about half that of the U-type and E-type. Toroidal transformer. The core has no air gap, and the winding is uniformly wound on the annular core. The magnetic circulation structure is almost in a closed space, achieving small magnetic leakage, weak electromagnetic radiation, strong resistance to external magnetic interference, no need to add a shielding layer, and it is installed on various electronic equipment with complex structures, without any electromagnetic interference.
The core has no air gap, high permeability and no vibration noise of physical structure. Even in the high current and high load operating environment, people can't hear the noise
When the ring transformer is loaded and operated, its temperature is very low. Generally, its iron loss can be less than 1W / kg, which is especially suitable for instruments with small heat dissipation space.
The power of the ring transformer is usually determined according to its diameter and height. The higher the power, the larger the volume and weight. The configuration of various power specifications and various input and output voltages is very flexible, and the processing equipment is simple and fast.
The temperature rise of the ring transformer under full load operation is only 40 ℃, which can allow short-time overload operation. The primary winding is insulated with class B (130 ℃) polyester film and can withstand the withstand voltage test of 4000V AC for 1 minute.
