We are using single phase AC capacitor start run Induction motor.I want to know the same motor can be changed to three phase motor or not.If it is possible what are parts i have to change.
You have to rewind the motor for 3-phase connection. First, get the no. of poles. Then get the no. of slots. Arrange the no. of coils per pole per phase. Then decide on the correct wire size needed.
2 ways Use an inverter or variable speed drive that will produce 3 phase from a single phase supply or replace the motor with an appropriate single phase type, you need to get the right frame size, speed and power. There are methods that use capacitors to create out of phase supplies but they only work poorly.
You'd have to replace the motor guts with the motor guts of a three-phase motor; single-phase and three-phase motors are totally different. For example, a 3 phase motor has starting torque while a single-phase motor requires a shading coil for starting. So it's not economical; just buy a real 3-phase motor. However, you can in principle hook up a single phase AC motor between two poles of a three-phase electrical installation (provided of course the motor's rated for the supply system voltage).
