9/23/2023 0 Comments Peak flux densityThe voltage induced in the primary when the sinusoidal voltage is applied is The flux density of the core can be reduced by increasing the cross-sectional area of the core. The flux through the core is the product of the flux density and the cross-sectional area of the core(Φ=B*A). The flux density of the core can be controlled by adjusting the cross-sectional area of the core during transformer designing. The flux density of the core can be controlled during the design stage of the transformer. The magnetization curve of the different material is as given below. The core must not get saturated in any case. If the flux density of the transformer is above 1.9 Tesla, the core of the transformer gets saturated, and it will lead to insulation failure of the laminated core. The designed maximum flux density of the core must be below the maximum rated flux density of the core. The maximum flux density of the CRGO core is about 1.9 Tesla. The transformer designer first checks the rated flux density of the colled rolled grain oriented(CRGO) core. It is desirable that the flux in the transformer must remain constant. The secondary voltage remains constant if the rate of change of the flux is constant. The voltage induced in the secondary coil is The useful flux that links to the secondary coil induces a voltage in the secondary according to the Faraday’s Law of Electromagnetic Induction. The losses in the transformer increase with an increase in the leakage flux. The flux that does not link to both primary and secondary coils is known as the leakage flux. Some parts of the magnetic flux links to the primary coil and other parts of the transformer. Practically, all the flux produced in the primary does not link to the secondary. The flux travels through the magnetic core and it gets linked to the secondary coil. The voltage induced in the coil can be expressed by the following mathematical expression. According to Faraday’s law of electromagnetic induction, the EMF is induced in the primary and as per the Lenz’ law, the induced EMF always opposes the primary current that is responsible for begetting the EMF. The magnetic flux produced in the primary coil is proportional to the ratio of the applied voltage to the frequency. The current flowing in the primary coil produces the magnetic flux. When an alternating voltage is applied to the primary coil, the current flows through it. The transformer has two coils wound around the common magnetic core.
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