Question

explain dc machine construction google ans accepted
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Answer 1

Working principle of a DC motor. A motor is an electrical machine which converts electrical energy into mechanical energy. ... When armature windings are connected to a DC supply, current sets up in the winding. Magnetic field may be provided by field winding (electromagnetism) or by using permanent magnets.

Answer 2

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...HERE GØΣS UR ANS...

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DC MOTOR :- CONVERTS ELECTRIC ENERGY TO MECHANICAL ENERGY....

CONSTRUCTION OF DC MOTOR:-

A DC motor is constructed with:

A Stator
A Rotor
A Yoke
Poles
Field windings
Armature windings
Commutator
Brushes

The magnetic frame or the yoke of DC motor made up of cast iron or steel and forms an integral part of the stator or the static part of the motor.

Its main function is to form a protective covering over the sophisticated inner parts of the motor and provide support to the armature.

It also supports the field system by housing the magnetic poles and field winding of the DC motor.

1. YOKE

Function

It provide mechanical Support for poles

It also provide protection to whole machine from dust, moisture etc.

It also carries magnetic flux produced by the poles

Yoke is also called as frame.

2. Core

Pole of a generator is an electromagnet.

The field winding is winding over pale.

Pole provides magnetic flux when field winding is excited.

3.POLE COIL

It is wound around pole core and called as field coil

it is connected in series to from field winding

When Current is passed through field winding it electro magnetize the poles which produce necessary flux.

5. Armature Core

It has large number of slots in its periphery

Armature conductor, are placed in this slots

It is also provide path of low reluctance to the flux produced by field winding

6. Armature Winding

Armature conductor are inter connected to form armature Winding

When armature winding is rotated using prime mover. the magnetic flux and voltage gets induced in it

Armature winding is connected to external circuit

7. Commutator

It Convert alternating current induce in the current in a unidirectional current

It collects the current form armature conductor and pass it load with the help of brushes

It also provide unidirectional torque for dc motor

8. Brushes

Brushes collect the current from commutator and apply it to external load.

Brushes wear with time and it is should be inspected regularly.

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