The AC motor is used to supply power for a wide variety of systems, from small servomechanisms to large industrial machines. Most AC motors have two main components, the stator and the rotor. The stator is a metal ring with slits that hold the coils made of insulated wire in a steel core and the rotor rotates at a rate slower than the frequency supplied to it.

AC electric motors need a change in frequency if they need to vary their speed, involving a more complex and expensive speed control. https://www.mrosupply.com/lubrication/lubricants/527798_l0847-060_lubriplate/          On the other hand, as the DC motor when varying the speed only requires a change in the voltage level, and it is more suitable for 12 Vdc-powered equipment such as automobiles, or industrial applications requiring fine speed control .

Speaking of AC electric motor, basically we are dealing with an electric motor that has its power in an alternating current. They are used to convert electrical energy into mechanical energy to produce work in a system. Specifically, rotational energy is produced from the force of magnetic fields induced by alternating current flowing through electric coils.