5. The primary reason for making the coil span of a d.c. armature winding equal to a pole pitch is to (a) obtain a coil span of 180° (electrical) (b) ensure the addition of e.m.fs. of consecu- tive turns (c) distribute the winding uniformly under different poles (d) obtain a full-pitch winding.

5. The primary reason for making the coil span of a d.c. armature winding equal to a pole pitch is to (a) obtain a coil span of 180° (electrical) (b) ensure the addition of e.m.fs. of consecu- tive turns (c) distribute the winding uniformly under different poles (d) obtain a full-pitch winding.

Delmar's Standard Textbook Of Electricity

7th Edition

ISBN:9781337900348

Author:Stephen L. Herman

Publisher:Stephen L. Herman

Chapter33: Single-phase Motors

Section: Chapter Questions

Problem 32RQ

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Concept explainers

Winding and Constructions

Alternating Current (AC) winding is generally of the 3-phase type due to the inherent advantages of the 3-phase machine. Armature coils must be connected to the yield balance (equivalent in magnitude and 2/3 of the series phase difference of the rod) 3-phase electromotive forces (emf). The armature should be divided into step-bands to start with slots around the perimeter.In the construction of AC machines, the frame is used as an external protective shield to protect it from environmental conditions. The frame also serves as the outer perimeter, allowing the interior to be easily placed. The static state section of the devices is the stator winding attached stator.

Question

Please choose the correct answer for question number 5. EXPLAIN BRIEFLY why it is the correct answer. Thanks!

5. The primary reason for making the coil span
of a d.c. armature winding equal to a pole pitch
is to
(a) obtain a coil span of 180° (electrical)
(b) ensure the addition of e.m.fs. of consecu-
tive turns
(c) distribute the winding uniformly under
different poles
(d) obtain a full-pitch winding.

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