1. The armature is laminated to control 2. The two side of an armature coil with full pitch will have induced emfs, that are Electrical degrees apart. 3. If there are six poles in the field 180 electrical degrees will be equal to mechanical degrees ………… 4. A coil that has coil span less than pole pitch or coil span is called pitch coil 5. If number of poles = 4, number of armature slots = 12. The pole pitch 6. In 5 above we will use … pitch coils 7. In 6 above if one side of coil is in slot 1 then the other side will be in slot . 8. If one side of coil is connected to commutator 1 and the other is connected to commutator three the commutator pitch = 9. The electrical degrees between two adjacent slots is called slot span by the book. In 5 above the slot span = electrical degrees 10. The field winding is supplied with a.c current? 11. A pole pitch is always. …electrical degrees
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1. The armature is laminated to control …………
Ans 1. Eddy current caused by leaping from one lamination to the next
The eddy current total in the laminated core is less than the current in the solid core. To prevent eddy currents from “jumping” from lamination to lamination, these laminations are generally isolated from each other using a lacquer covering.
2. The two side of an armature coil with full pitch will have induced emfs, that are …………………. Electrical degrees apart.
Ans 2. 180o electrical
The first type is a full pitched coil, which has two sides that are 180 degrees (electrically) apart. When one side of a full pitched coil is under the N pole, the other side is under the S pole. The induced emfs on two opposing sides of the coil differ by 180 degrees .
3. If there are six poles in the field 180 electrical degrees will be equal to …………. mechanical degrees
Ans 3. 4o mechanical degrees