An electric motor converts electrical energy into mechanical energy. Electric motors may contain a rotor - a moving component with thin sheets of stacked metal called laminations that turns the shaft and delivers mechanical power; a stationary stator- which consist of a group of electromagnets or permanent magnets with laminations in the stator core; windings - wires of a coil wrapped usually around a laminated iron magnetic core; a commutator - a cylindrical device with contact bars fixed to the rotating shaft of the motor and connected to the windings that switches inputs; and brushes - current conducting material (usually carbon or graphite) that conducts current from the power supply to the windings. Together, they generate force from the interaction between magnetic fields and winding currents.
There are many different categories and designs of motors serving a huge variety of applications. Most motors use either direct current (DC) sources like batteries, or alternating currents (AC) like power grids. The specific categories MCMA presents on this site are: