You know, comparing with DC motor, AC motor at least has the following three merits:
1) Without comutator, AC motor is simple in structure and convenient in fabrication;
2)AC motor is relative firmly, which is easy to be made a high speed, high voltage, large current and large capacity one;
3)The coverage area of AC motor is quite widely from a few watts to hundreds of thousands of kilowatts, or even millions of kilowatts.
I guess, this is why the electric car company Tesla Motors use AC motors instead of DC motors in their cars.
