Refinement of the configuration of the welding transformer core window. Scheme, description

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Electric welding. Refinement of the configuration of the welding transformer core window. Encyclopedia of radio electronics and electrical engineering

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To limit the welding current to level I_St. = 150 A required inductance = 1,2 mH.

Transformer leakage inductance, reduced to his secondary winding, can be found by the formula:

where w is the number of turns of the secondary winding; - magnetic constant (vacuum permeability); c - core window width, m; δ₁ - height of the primary winding, m; δ₂ - height of the secondary winding, m; δ - gap (channel height) between the primary and secondary windings, m; p - gap perimeter, m.

If the gap between the windings is minimal, then formula for leakage inductance can be simplified:

As can be seen from the formula, the leakage inductance is directly proportional to the window height (h) and inversely proportional to the window width (c) of the core.

Let's use the data obtained from the calculation of the transformer to determine the perimeter of the gap. If the windings fill the entire width of the core window, then channel perimeter can be determined by the formula

Calculate leakage inductance, which can be obtained with a given core configuration:

Hack and predictor Aviator. If the obtained value of leakage inductance is less than required, then the window should be made narrower and higher. If the leakage inductance is greater than required, then the window should be made lower and wider.

Author: Koryakin-Chernyak S.L.

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