|
every time you add a step you get a loss, a/c motors tend to be more efficient because all motors in the end run off a/c, with a d/c motor it is being mechanically changed to a/c as the motor rotates, this is the job that the carbon brushes have, sad thing is carbon is not very conductive but it is used because it is self lubricating and wears well without welding it's self to to commutator or creating many other problems.
With an a/c brush less motor you do away with the brushes... of course and rely on the switching of the a/c, because the motor has to vary in speed you need an inverter that is designed for this, if you want to run a regular 120v motor in your electric car and run it off a/c it is going to get more complex and less efficient, granted I only described a few of the many options but if really, you just want to run your lap top off an electric car, get a d/c to d/c converter and a 12 volt cord for your lap top, it is basically going to be a switching power supply, pretty efficient.
|