What is the winding direction of a winding?

The winding direction of a winding is closely related to the direction of the magnetic field generated by the current in the winding and the direction of the induced electromotive force in the winding when the magnetic field changes. The winding direction can be divided into two types: left-handed and right-handed.

Left-handed winding refers to the counterclockwise rotation of the coil when the wire turns from the start to the middle of the winding; right-handed winding refers to the clockwise rotation of the coil when the wire turns in the winding direction. When winding, facing the winding machine, if the wire enters the winding machine from behind the operator, the winding formed with the start on the left side of the winding machine is called a right-handed winding, and the winding formed with the start on the right side of the winding machine is called a left-handed winding. In simple terms, "left starts, right winds; right starts, left winds."

Generally, once the winding is completed, its direction cannot be changed. However, for double-layer cylindrical windings and windings with only a single coil, if the symbols of the start and finish are exchanged, the winding direction needs to be changed accordingly, as the direction along the coil turns changes in this case.

According to the principles of transformers, in a two-pillar single-phase transformer, if the winding direction of the primary winding is incorrect, there will be no magnetic flux in the core; if the winding direction of the secondary winding is incorrect, it will short-circuit when connected in parallel, and the secondary voltage will be zero when connected in series. Errors in the winding direction of the primary or secondary winding will change the transformer's connection group. In a three-phase transformer, if the winding direction of the primary winding is incorrect, the magnetic flux will also not form a closed loop in the core. Errors in the winding direction of the primary or secondary winding will also change the transformer's connection group.

Therefore, it is evident that errors in the winding direction of windings in transformers are not allowed. In a transformer, the winding directions of various windings may not be consistent, depending on their connection methods. For example, in the parallel connection of two-pillar single-phase transformers, the winding directions are necessarily different, with one pillar being left-handed and the other being right-handed. Similarly, the winding direction within a winding may also be inconsistent, as seen in the opposite winding directions of two segments in a reverse-connected winding or the opposite winding directions of two parallel branches in an up-down parallel winding.

LuShan, est. 1975, is a Chinese professional manufacturer specializing in power transformers and reactors for 49 years. Leading products are single-phase transformer, three-phase transformers, DC inductors, AC reactors, filtering reactor, expoxy resin high-voltage transformer and intermediate, high-frequency products. Our transformers and reactors are widely used in 10 application areas: rapid transit, construction machinery, renewable energy, intelligent manufacturing, medical equipment, coal mine explosion prevention , excitation system, vacuum sintering, central air conditioning.

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