Question

please solve this...........​

Answer 1

A DC motor is any of a class of rotary electrical motors that converts direct current electrical energy into mechanical energy

Answer 2

ELECTRIC MOTOR DC:-

IT IS A ROTATING DEVICE THAT CONVERTS ELECTRICAL ENERGY TO MECHANICAL ENERGY.

PRINCIPLE:-

WHEN A COIL CARRYING CURRENT IS PLACED IN A MAGNETIC FIELD IT EXPERIENCES A FORCE AND BEGINS TO ROTATE IN THE FIELD.

CONSTRUCTION:-

ARMATURE:-

THE ARMATURE ABCD CONSISTS OF A RECTANGULAR COIL OF INSULATED COPPER WIRE

FIELD MAGNETS:-

THE MAGNETIC FIELD IS SUPPLIED BY THE TWO POLES OF PERMANENT MAGNET

SPLIT RINGS:-

THESE ARE THE TWO HALVES P AND Q OF A METALLIC RING THE ENDS OF THE ARMATURE COIL ARE CONNECTED TO THE SPLIT RINGS WHICH ROTATES ALONG WITH THE ARMATURE

BRUSHES:-

THESE ARE 2 CARBON BRUSHES X AND Y HAVING CONSTANT TOUCH WITH THE SPLIT RINGS AND PROVIDE CONTACT WITH EXTERNAL CIRCUIT

WORKING:-

• CURRENT ENTERS THE COIL ABCD FROM THE SOURCE BATTERY THROUGH THE CONDUCTING BRUSH X AND FLOWS BACK TO THE BATTERY THROUGH BRUSH Y.
• IN ARM A B OF THE COIL CURRENT FLOWS FROM A TO B AND IN THE ARM CD IT FLOWS FROM C TO D THAT IS OPPOSITE TO THE DIRECTION OF THE CURRENT THROUGH AB.
• ON APPLYING FLEMING'S LEFT HAND RULE THE FORCE ACTING ON THE ARM AB PUSHES IT DOWNWARDS AND THE FORCE ACTING ON CD PUSHES IT UPWARDS. THUS THE CALLED AND AXLE OF MOUNTED FREE TO TURN ABOUT AN AXIS ROTATE ANTICLOCKWISE.
• AT HALF ROTATION Q MAKES CONTACT WITH BRUSH X AND P WITH BRUSH Y THE CURRENT IN THE COIL GETS REVERSED AND FLOWS BACK ALONG THE PATCH DCBA. THE SPLIT RINGS ACTS AS A COMMUTATOR TO REVERSE THE CURRENT.
• THE REVERSAL OF CURRENT REVERSES THE DIRECTION OF FORCES ACTING ON THE TWO ARMS AB AND CD. so the arm AB was earlier pushed downwards is now pushed upwards. the arm CD earlier pUSHED UP is pushed down. the reversing of current is repEATED at each half rotation and gives rise to continuous rotation of coil.

this is the correct answer .... I think so

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