Scheme: Induction motor An induction motor is a machine. Any machine that converts electrical energy into mechanical energy is called a motor. An induction motor works according to the principle of electromagnetic induction. Let us know why it is called induction motor. In a d.c motor electrical energy is conducted directly to the armature (i.e rotating part of the motor) through brushes and Commutator. Hence the d.c motor can be called the conduction motor. Like this in a.c motors, the rotor does not connect to the electrical energy by conduction instead by induction. In this sense, such an electric motors are called induction motors. An induction motor is also called a rotating transformer because this operating principle is consistent with the transformer operating principle. That is, the primary winding is stationary but the secondary winding is rotable.