Principle and winding method of transformer coil

Transformer is divided into mutual inductance transformer and autotransformer. The primary coil generates a changing magnetic field through the changing current, and the secondary coil induces the changing current in the changing magnetic field. The ratio of the primary coil to the secondary coil determines the transformation ratio of the transformer. In the whole process, the coil plays the role of converting electrical energy to magnetic energy and then to electrical energy, and changes the size of voltage and current.

Working principle of transformer

The transformer consists of an iron core (or magnetic core) and a coil. The coil has two or more windings. The winding connected to the power supply is called the primary coil, and the other windings are called the secondary coil. The secondary coil is outside the primary coil. When the primary coil is energized with alternating current, the transformer core generates alternating magnetic field, and the secondary coil generates induced electromotive force. It can transform alternating voltage, current and impedance. The turn ratio of the transformer coil is equal to the voltage ratio.

Transformer coil

Transformer coil is a kind of coil, which needs to be operated inside the transformer. According to the number of phases: (1) Single-phase transformer: used for single-phase load and three-phase transformer group. (2) Three-phase transformer: used for raising and lowering voltage of three-phase system. According to capacity: the coils of small transformers generally use round copper wires with insulation, while large transformers use flat copper wires with insulation.