# What is meant by full pitched coil winding ?

Full pitched coil winding refers to a winding technique where each coil span (or coil section) within a stator or rotor winding of an electrical machine, such as a motor or generator, covers the entire pole pitch. In other words, the coil extends across the entire distance between two consecutive poles of the machine’s magnetic field. This method ensures that the coil’s end is at a position that is aligned with the pole shoes or magnetic poles of the machine.

Similarly, full pitched winding refers to the same concept in electrical machine winding terminology. It signifies that each coil in the winding spans the full distance or pitch between adjacent magnetic poles. This ensures that the coil’s position and alignment are optimized for efficient electromagnetic interaction with the machine’s magnetic field, thereby enhancing performance and reducing potential losses.

The difference between full pitch and short pitch coil windings lies in the span or distance that each coil covers relative to the pole pitch of the electrical machine. In a full pitch winding, each coil spans the entire distance between two adjacent poles. In contrast, a short pitch winding involves coils that span less than the full pole pitch distance. Short pitch windings are used to modify the distribution of harmonics in the machine’s operation, which can affect torque characteristics, reduce cogging, or improve efficiency depending on the specific design requirements.

One advantage of full pitch winding in electrical machines is its simplicity and straightforward electromagnetic interaction with the magnetic field. Full pitch windings often result in smoother operation and reduced harmonic content compared to short pitch windings. They also tend to exhibit better mechanical stability and reliability due to the balanced distribution of electromagnetic forces within the machine.

The pitch of a coil in electrical winding refers to the distance or span between two consecutive coil sides or sections along the axis of the machine. It specifically denotes the distance from one coil side to the corresponding position of the next coil side within the winding. The pitch is crucial in determining how the coils interact with the machine’s magnetic field and influences various performance characteristics such as torque production, efficiency, and electromagnetic interference. Adjusting the coil pitch, whether full or short, allows engineers to optimize these factors according to the specific requirements of the electrical machine’s design and application.