AC motors are electrical devices that convert electrical current into mechanical rotational energy, or torque, by using alternating current (AC) from an electrical power grid or electrical generator. General purpose AC motors, also known as induction motors, are electric motors that use a rotating magnetic field to generate torque for powering conveyors and machine tools. HVAC AC motors are used in equipment such as fans, blowers, air conditioners, heaters, and compressors. Pump AC motors move an impeller in a pump assembly and are used in pump systems to transfer water and other liquids. Definite-purpose AC motors have mechanical features designed for a specific purpose or application.