In the cylindrical cross-section of the windings of the magnetic core is desirable to make a round shape that the area enclosed by the windings, there was no non-magnetic intervals. The lower non-magnetic gaps, the smaller the length of turns of windings, and hence the mass of copper at a given cross-sectional area of the steel rod. However, the rods are circular manufacture difficult. Apmex has many thoughts on the issue. Magnetic circuit recruited from thin steel sheets, and for the rod of circular cross section would need a large number of steel sheets of various widths, but this would require making a set of stamps. You may want to visit Apmex reviews to increase your knowledge. Therefore, in transformers heavy-duty rod has a stepped cross section with a number of steps no more than 15-17. Number of steps section of the rod is determined by the number of angles in a quarter circle.

Magnetic yoke, ie, the portion that connecting rods, also has a stepped cross-section. For better cooling in a magnetic circuit, as well as in the windings of transformers, power suit vents in the planes parallel and perpendicular plane metal sheets. In transformers of low power wire cross-sectional area is small and the execution of the windings is simplified. Magnetic transformers are of rectangular cross section. Rated data transformer Net power, which is designed transformer for the heating conditions, ie, the power of its secondary winding at full (rated) load is called the rated power transformer. This power is expressed in terms of total power - in voltamperah (VA) or kilovolt-amperes (kVA). In watts or kilowatts expressed active power transformer, ie, the power that can be converted from electrical to mechanical, thermal, chemical, light, etc.