This document discusses lap and wave winding methods for electrical generators. Lap winding involves connecting the ends of coils to the same segment of a commutator. Wave winding connects the starting end of one coil to the end of the next coil of the same polarity. An example problem calculates the induced EMF and armature current of a short-shunt compound generator delivering 30A at 220V. The document provides guidance to refer to notes for better understanding generator equations and examples involving speed and load current calculations. Students are assigned math problems related to the content covered.

1. EECE 269 : Electrical Drivers and Instrumentation
Ref Book : A Textbook of Electrical Technology
by B.L Theraja
CLASS 3-6
Asif Noor Jamee
Lecturer
EECE Dept, BMA
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2. Lap & Wave Winding
Lap winding : The one end of the armature coil
is connected to the one segment of the
commutator and the second end of the first coil
and first end of the second coil are placed on
the same segment of the commutator.
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Wave winding : In wave winding, one
end of the first armature coil is
connected to the starting end of the
second coil, and which have the same
polarity. In wave winding, winding is
connected to wave shape, so these
windings are called wave windings.

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Example 26.5. A short-shunt compound generator delivers a load
current of 30 A at 220 V, and has armature, series-field and
shunt-field resistances of 0.05 Ω, 0.30 Ω and 200 Ω respectively.
Calculate the induced e.m.f. and the armature current. Allow 1.0
V per brush for contact drop

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Generated E.M.F. or E.M.F.
Equation of a Generator
d
dt

60
PN

d
dt

Please see in your notes for better
understanding

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Answer: Please see your note

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Example 26.12. A separately excited generator, when running
at 1000 r.p.m. supplied 200 A at 125 V. What will be the load
current when the speed drops to 800 r.p.m. If If is unchanged ?
Given that the armature resistance = 0.04 ohm and brush drop
= 2 V

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Please see in your notes for an alternate way of finding the new load current

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CT 1 SYLLABUS : UP TO
THIS LECTURE
ASSIGNMENT ALL THE
MATH OF THIS SLIDE

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