Q. Why AC is converted to DC and then DC to AC in an AC motor?

Answer

The main reason for converting AC into DC and then again into AC is that the DC motor has the ability to store electrical energy which AC motor cannot do. Most of the electrical devices need constant or stable voltages which is why AC is converted into DC by using rectifiers. AC drives or motors are also called variable frequency drive that oscillates between negative and positive current. The energy stored in DC drive then creates output AC waveform using the fast-switching transistors. The conversion of DC into AC is done to control electrical motor speed that is aimed at decreasing mechanical stress on motor and also maximize the operation of different appliances depending on electric motors.