Over 90% of all electric motors applied in the industry are from AC induction motors because of their simplicity, strong construction and relatively lower manufacturing costs. They are adaptable to diverse environments and able to provide considerable power as well as variable speed control with a frequency inverter.
There are two different types of electric motors: the asynchronous (induction) and the synchronous electric motor.
The asynchronous (induction) electric motor: is designed with coils in its armature or stator and achieve the torque in the rotor through currents induced in these coils changing the magnetic field, that is, the voltage is “induced” in the rotor through electromagnetic induction , extinguishing the need for brushed or sliding ring switching.
The synchronous electric motor: this type of motor uses a coiled rotor reelcraft EA33112 M24D because coils of wire are placed in the grooves of this rotor. The rotor in turn is excited by an external direct DC power supply, employing sliding rings and brushes to supply current to the rotor. This motor is made to operate at a specific constant speed in accordance with the rotating magnetic field. A synchronous motor is applied where we need an exact speed.