Working Principle of DC Motor (animation of elementary model)

Summary

An educational overview of how a DC motor functions using an elementary model to explain magnetic fields, current flow, and mechanical torque.

Highlights

Basic Operating Principle00:00:02

A DC motor works based on the principle that a current-carrying conductor placed in a magnetic field experiences a mechanical force.

Construction and Current Flow00:00:27

The motor consists of an armature, a commutator system, and permanent magnets. DC supply causes current to flow through the armature, generating force.

Fleming's Left-Hand Rule00:01:35

Explanation of how to determine the direction of mechanical force using Fleming's left-hand rule, where the thumb, forefinger, and middle finger represent force, field, and current.

Torque and Rotation00:02:39

The force on the armature conductors creates torque. As the motor passes the vertical position, the moment of inertia allows it to continue rotating until the commutator shifts the current.

Conclusion and Real-World Application00:04:47

The continuous rotation is maintained as conductors swap positions relative to the poles. Actual DC motors scale this principle by using multiple turns of coils and multiple magnetic poles.