constructionofdcmachinesencrypted-140226134456-phpapp02-200823045508 (1).pdf

Dc machines

1. Main constructiondiagram

3. Main
parts
The two major parts required for construction:
1.Stator
Thathouses the fieldwinding
1.Rotor
Rotating part that rotates in magneticfield

5. Other
parts□Eye bolt
□Yoke
□Poles(pole core and pole shoes)
□Fieldwinding
□Armature core
□Armaturewinding
□Commutator
□Brushes
□End covers
□Bearings
□Shaft
□Terminal box
□Interpoles

6. Yoke
□Itsmainfunctionisto
formaprotective
coveringovertheinner
sophisticatedpartsof
themotorandcarries
thefluxproducedby
thepoles.
□Made up of cast iron or
steel.

7. Pole
s□Themagneticpolesare
structuresfittedontotheinner
walloftheyokewithscrews.
□Theconstructionofmagnetic
polesbasicallycomprisesof
twopartsnamely,the
coreandthepole
stackedtogether
hydraulicpressureand
pole
shoe
under
then
attached to theyoke.

8. Fieldwinding
□Madewithfieldcoils
(copperwire)wound
overtheslotsofthe
poleshoes
□Thefieldwindings
basicallyforman
thatelectromagnet,
produces fieldflux

9. Armature
□Thearmaturecoreare
providedwithslotsto
whichthearmature
windingsmadewith
severalturnsofcopper
wire distributed
uniformlyoverthe
entireperipheryofthe
core.

11. Commutat
or
□Itisacylindricalstructure
madeupofcoppersegments
stackedtogether,but
insulatedfromeachotherby
mica.
□Collectsthecurrentfromthe
armatureconductors
alternatingcurrent
inthearmature
intounidirectional
□Converts
induced
circuit
current.

12. Brush
es
□Madewithcarbonor
graphitestructures,
makingslidingcontact
overtherotating
commutator.
□Collectsthecurrent
fromcommutatorand
makeitavailabletothe
stationaryckt.