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.

AC generator consists of a permanent magnet that rotates inside a coil in such a way that the N-pole and S-pole alternate as seen from the coil. An AC generators are capable of providing high current output even at low engine speeds. These AC generators use a design that is basically the reverse of a DC generator. In an AC generator, a spinning magnetic field rotates inside an assembly of stationary conductors. AC generator includes two sip rings mounted directly on the rotor shaft. These generators use three windings to generate the required amperage output.