Tuesday, 30 January 2018

DC Motor Principle And Working!!

What is Principle Of DC Motor And How Its Work  ?!




DC Motor principle




An Electric Motor is a machine which converts electric energy into mechanical energy.



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Its action is based on the principle that a current-carrying conductor is placed in a magnetic fied, it experiences a mechanical force whose direction is given by "Fleming's Left-hand Rule " and whose magnitude is given by 
  • F = BIL Newton.

Where  B= magnetic field intensity          
              I= current flowing in the  conductor
              L=lenght of the conductor





  • Constructionally.,there is no basic difference between a d.c. generator and a DC Motor. 
  •  In fact, the same d.c. machine can be used interchangeably as a generator or as a motor. 
  • DC  Motors also like generators shunt wound or series wound or compound wound. 

.

In the figer a part of multipolar DC Motor shown. When its field magnets are excited and its armature conductors are supplied with current from the supply mains, they experience a force tending to rotate the armature.

  • Armature conductors under N-poles are assume to carry current downwards(crossed) and those under S-poles, to carry current upward(dots).
  • By applying fleming left hand rule the direction of the force on each conductors can be found. It is shown by small arrows placed above each conductor.  
It will be seen that each conductor can be found.  It will be seen that each conductor experiences a force F driving torque which sets the armature rotating.

It should be noted that the function of a commutator in the motor is the same as in the generator. By reversing current in each conductor as it passed from one pole to another, it help to develop a continuous and unidirectional torque.





Application of DC Motor

(1) shunt type DC Motor

*for driving constant speed line shafting
*Lathes
* centrifugal pumps
* Machine tools
*Blowers and fans
*Reciprocating pumps

(2) series type d.c motor

* For traction work i.e. Electric locomotives
*Rapid transut system
*Trolley, cars etc.
*Cranes and hoists
*Conveyors

(3) Comulative compound type DC Motor 

* For intermittent high torque loads
*For shears and punches
*Elevators
*Conveyors
*Heavy planers
*Rolling mills : Ice machine : Printing prosses : Air copressors





Questions Related To DC Motor:

1) define function of DC Motor???
Ans: An electric motor is a machine which converts electric energy into mechanical energy.

2) In d.c. motor conductor is experienced force by whose principle??
Ans: Fleming's Left-hand Rule

3)what is the function of commutator in d.c. motor??
Ans: the function of a commutator in the motor is the same as in the generator. By reversing current in each conductor as it passed from one pole to another, it help to develop a continuous and unidirectional torque.

4) In lathes machine which type of motor are uses???
Ans:shunt type d.c. motor

5)where the  series type d.c motor are used??
Ans:
* For traction work i.e. Electric locomotives
*Rapid transut system
*Trolley, cars etc.
*Cranes and hoists
*Conveyors

6)For intermittent high torque loads which motor are used?? 
Ans: Comulative compound type d.c. motor


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