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How Does a DC Motor Work?


Electric motors are essential components in industrial machines, household appliances, electric vehicles, robotics, and automation systems. Among the most widely used motors are the DC motor and the induction motor. Although both convert electrical energy into mechanical energy, they differ significantly in their operating principles, construction, and applications.

What Is a DC Motor?

A Direct Current (DC) motor is an electrical machine that converts direct current (DC) electrical energy into mechanical rotation. It operates based on the interaction between a magnetic field and a current-carrying conductor.

How Does a DC Motor Work?

The working principle of a DC motor is based on Lorentz Force, which states that when a current-carrying conductor is placed in a magnetic field, it experiences a force. This force creates torque that rotates the motor shaft.

Working Process

  1. DC voltage is supplied to the armature winding.
  2. The armature current produces its own magnetic field.
  3. The magnetic field of the armature interacts with the field produced by the stator magnets or field windings.
  4. This interaction generates torque.
  5. The armature begins rotating.
  6. The commutator reverses the current direction every half rotation to maintain continuous rotation.
  7. The motor converts electrical energy into mechanical energy.

Main Components of a DC Motor

  • Stator
  • Rotor (Armature)
  • Commutator
  • Carbon Brushes
  • Shaft
  • Field Windings or Permanent Magnets
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