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describe the working principle of dc motor?
Answers
Answer:
An Electric DC motor is a machine which converts electric energy into mechanical energy. The working of DC motor is based on the principle that when a current-carrying conductor is placed in a magnetic field, it experiences a mechanical force.
The direction of mechanical force is given by Fleming’s Left-hand Rule and its magnitude is given by F = BIL Newton.
There is no basic difference in the construction of a DC generator and a DC motor. In fact, the same d.c. machine can be used interchangeably as a generator or as a motor. Like generators DC motors are also classified in to shunt-wound, series-wound and compound-wound.
DC motors are seldom used in ordinary applications because all electric supply companies furnish alternating current.
However, for special applications such as in steel mills, mines and electric trains, it is advantageous to convert alternating current into direct current in order to use dc motors. The reason is that speed/torque characteristics of d.c. motors are much more superior to that of a.c. motors. Therefore, it is not surprising to note that for industrial drives, d.c. motors are as popular as 3-phase induction motors.
DC Motor Principle
A machine that converts DC power into mechanical power is known as a DC motor.
Its operation is based on the principle that when a current carrying conductor is placed in a magnetic field, the conductor experiences a mechanical force.
The direction of this force is given by Fleming’s left hand rule and magnitude is given by;
F = BIL Newtons
Basically, there is no constructional difference between a DC motor and a DC generator. The same DC machine can be run as a generator or motor.
Answer:
The DC motor is the device which converts the direct current into the mechanical work. It works on the principle of Lorentz Law, which states that “the current-carrying conductor placed in a magnetic and electric field experience a force”.