Page 337 - CITS - Electronic Mechanic - TT - 2024

ELECTRONICS MECHANIC - CITS

Construction of DC Motor

The armature coil is the rotating part whereas the stationary part is the stator. In this, the armature coil is
connected toward the DC supply which includes the brushes as well as the commutators. The main function of
the commutator is to convert the AC to DC which is induced in the armature. The flow of current can be supplied
by using the brush from the motor’s rotary part toward the inactive outside load. The arrangement of the armature
can be done in between the two poles of the electromagnet or permanent.
DC Motor Parts
In DC motors, there are different popular designs of motors that are available like a brushless, permanent
magnet, series, compound wound, shunt, otherwise stabilized shunt. In general, the parts of dc motor are the
same in these popular designs but the whole operation of this is the same. The main parts of dc motor include
the following.
• Stator
A stationary part like a stator is one of the parts in DC motor parts which includes the field windings. The main
function of this is to get the supply.
• Rotor
The rotor is the dynamic part of the motor that is used to create the mechanical revolutions of the unit.
• Brushes
Brushes using a commutator mainly work as a bridge to fix the stationary electrical circuit toward the rotor.

• Commutator
It is a split ring that is designed with copper segments. It is also one of the most essential parts of dc motor.
• Field Windings
These windings are made with field coils which are known as copper wires. These windings round approximately
the slots carried through the pole shoes.
• Armature Windings
The construction of these windings in the DC motor is two types like Lap & Wave.
• Yoke

A magnetic frame like a yoke is designed with cast iron or steel sometimes. It works like a guard.
• Poles
Poles in the motor include two main parts like the pole core as well as pole shoes. These essential parts are
connected together through hydraulic force & are connected to the yoke.
• Teeth/Slot
The non-conducting slot liners are frequently jammed among the slot walls as well as coils for safety from
scratch, mechanical support & additional electrical insulation. The magnetic material between the slots is called
teeth.

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CITS : E & H - Electronics Mechanic - Lesson 205 - 222