7. A 72-slot stator has a half-coiled four-pole three-phase winding. How many coils are there (a) per phase; (b) per group? 8. A 144-slot stator has a whole-coiled 12-pole three-phase winding. Calculate the number of coils: (a) per phase; (b) per group. 9. A 90-slot stator has a three-phase six-pole whole-coiled winding, each coil of which spans from slot 1 to slot 14. Calculate: (a) the pitch factor; (b) the distribution factor.
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For a half-coiled four-pole three-phase winding, each phase will have 72/3 = 24 slots. Since each coil spans half a pole pitch, there will be 4/2 = 2 coils per pole. Therefore, there will be 2 * 3 = 6 coils per phase. Show more…
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