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Question:

Why is it better to use a DC motor rather than a AC motor?

Why is it better to use a DC motor rather than a AC motor?

Answer:

Be more specific, which would be better would depend on the application.
Wouldn't that depend on your application, power demand, power availability, etc? If you're running a toy remote controlled car, you'd get better efficiency with a DC motor, but if you're turning a ceiling fan, the heat loss in converting AC line power to DC to run the motor would kill your efficiency and an AC motor would be better.
AC motors are lower in cost when used for loads requiring more than 1/2 horsepower. And they are more reliable and easy to maintain. Plus they don't have brushes like DC motors do. They are also smaller in size than DC motors. DC motors are better to use when you need variable speeds because AC motor speed control is more expensive. And DC motors are efficient running at speeds lower than AC motors can.

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