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Electric welding. How to test the unknown iron of a welding transformer. Encyclopedia of radio electronics and electrical engineering
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Working at the maximum possible induction in the core of the welding transformer allows you to reduce the cross section of the core. To use this feature, you need to know the value of the maximum induction for the selected core material.
Here the situation is complicated by the fact that an amateur designer usually deals with transformer iron of an unknown brand. Trying to use this iron, they often choose an underestimated value of the maximum induction, which, in turn, leads to an unjustified increase in the size and weight of the welding transformer.
Following is the iron test method, using which it is possible to determine the saturation induction of the transformer iron available.
First, from the existing transformer iron, you need to assemble a test closed core with a cross section of 5-10 cm2. The cross section of the core is determined by multiplying the thickness of the plate by its width and the total number of plates. On the resulting core, it is necessary to wind the winding with a voltage of 1,5-2,5 V (~ 2 turns) with a soft insulated wire with a cross section of 5-10 mm50. Then you need to measure the active resistance Robm windings and calculate the average length of the magnetic field line Lc core. Using the formula in Fig. 18.22, you can calculate the average length of the magnetic field line of the core core.
Rice. 18.22. The main dimensions of the core core
On fig. 18.23 shows a circuit that allows you to determine the value of the saturation induction of the tested core. The power of the transformer T is not less than 63 VA. The measurement results are entered in the second and third columns of the table. 18.4.
Table 18.4. Measurement results
Rice. 18.23. Scheme for testing transformer iron
The values in columns 4 and 5 of the table are calculated using the formulas given. Then, using the data of columns 5 and 6 (H ~ - the intensity of the alternating magnetic field, B - induction in the core), we build a graph of the magnetization curve of the tested core (Fig. 18.24).
On fig. 18.24 shows the graphical constructions necessary to find the values of saturation induction Bs, maximum induction Bm and the maximum intensity of the alternating magnetic field of the core H~.
Rice. 18.24. Magnetization curve
Author: Koryakin-Chernyak S.L.
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