Thursday, August 27, 2020

Electric Motor

Electric motor woks on the principle of motor effect which states that if current carrying conductor is placed on magnetic field the conductor experiences force of deflection. This theory is just opposite of electromagnetic induction theory.

An electric motor is an electrical machine that converts electrical energy into mechanical energy. Most electric motors operate through the interaction between the motor's magnetic field and electric current in a wire winding to generate force in the form of torque applied on the motor's shaft. Electric motors can be powered by direct current (DC) sources, such as from batteries, motor vehicles or rectifiers, or by alternating current (AC) sources, such as a power grid, inverters or electrical generators.

Difference Between DC & AC motor

DC Motor

AC Motor

  1. DC motors is also a rotatory electric motor that converts Direct current  into mechanical energy.
  2. DC motors can run only on single-phase supply.
  3. DC motors are always self-starting in nature
  4. In the case of DC motors, speed can be controlled by changing the armature winding’s current.
  1. AC motors can be defined as an electric motor which is driven by an alternating current (AC).
  2. AC motors can run on both single-phase and three-phase supplies.
  3. A three-phase AC motor is self-starting but a single-phase AC motor requires a starting mechanism.
  4. The speed of an AC motor can be changed by varying the frequency.


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