Question
Download Solution PDFWhich of the following is NOT true with respect to short-pitched coils in alternators?
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFConcept:
Advantages of Short Pitch Coil:
- Reduces the amount of copper needed for End Connection when compared with Full Pitched Coil.
- Improves the waveform of generated EMF i.e. generated EMF can be made to approximate to a sine wave more easily and the distorting harmonics can be reduced or eliminated.
- Eddy current and hysteresis losses are reduced.
Additional Information
Coil pitch or coil span: It is defined as the angular distance between the two coil sides of one coil. It is expressed in terms of electrical space degree.
| Full pitch winding | Short pitch winding |
| The angular distance between the two coil sides is one pole pitch, it is called a full pitch coil. | The angular distance between the two coil sides is less than one pole pitch, it is termed short pitch or fractional pitch coil. |
| The coil span equal to 180 electrical degrees |
The coil span is less than 180 electrical degrees Here ξ is the chorded angle or short pitch angle. |
Last updated on Jun 16, 2025
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