AC contactors are used for making and breaking circuits. These are fitted with coils that, at initial switch-on, use conventional AC supply voltages to close the contactor. As the contactor closes a switch automatically operates introducing a circuit that converts the mains voltage to 12 volts DC.
AC drive controller is an electronic power converter/filter/inverter network that utilizes high-efficiency power semiconductor switches to synthesize variable frequency sine-wave power to the motor. It consists of a phase assembly for each phase of a polyphase supply to a motor. Each phase assembly consists of an invertor module and a corresponding filter module.
There are two types of AC electric motors; the synchronous motor and the induction motor. It can also be divided into single phase and three phase motors. Single phase AC electrical supply is what is typically supplied in a home. Three-phase electrical power is commonly only available in a factory setting.