The function of the power transformer is power transmission, voltage transformation and insulation isolation. As a major soft magnetic electromagnetic element, it is widely used in power technology and power electronic technology.
Power transformer production
Make a wooden core. The wood core is a kind of auxiliary tool that fixes the coil frame on the winding machine to facilitate the winding.The length and width slightly greater than the iron heart section, the height is greater than the height of the iron heart window.The fixing hole in the middle of the wood core must be positive, so as not to shake and skew the winding, affect the speed and quality of the winding.Wood core should be processed with dry soft poplar wood.
Power transformer design
The first step, calculate the power of the secondary power P2, the secondary power is equal to the sum of the power of each group, that is, P2 = U21*i21+U22*i22+┅+U2N*I2N.After calculating P2, considering the efficiency of the transformer, the primary power P1 = P2/η, η is generally between 0.8 and 0.9.+P2)/2 Step 3, check the cross -sectional area of ??the iron heart.Based on the power of the transformer, the iron -hearted area S is calculated by the formula (2.1), and the iron -hearted film specifications and thickness are selected from the standard iron -hearted sheet specification table commonly used by domestic small power transformers.
Power transformer model
There are two types of iron cores of commonly used power transformers from appearance recognition.E -shaped iron core transformer is a shell structure (iron core wrap coil), which uses D41 and D42 high -quality silicon steel sheets as iron cores, which are widely used.C -shaped iron core transformer uses cold -rolled silicon steel as iron cores, with a small magnetic drain, small volume, and a core structure (wrapped iron core).
Power transformer working principle
Output and input a special transformer that shares a set of coils. The voltage and lower voltage of the voltage and lowering voltage are achieved with different taps. The pulp voltage less than the common coil is reduced. The pulp voltage with more parts of the common coil increases.

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