Copper rotors vs. aluminum rotors

[307startup]

Does anyone know all the components in a stepper motor and why they are non-rebuildable? I just read an article about copper rotors boosting efficiency of electric motors to 95% compared to 90% of aluminum rotors. I was thinking about buying a couple of sealed steppers to test before and after. This might be a way to make servos and stepper motors even more efficient.

[hignog]

The only rotor i can think of that is aluminum is an induction motor.
If you are talking about the windings, then i know that some manufactures have been working with aluminum because of the rising costs of copper.

Originally Posted by WYLD Does anyone know all the components in a stepper motor and why they are non-rebuildable? I just read an article about copper rotors boosting efficiency of electric motors to 95% compared to 90% of aluminum rotors. I was thinking about buying a couple of sealed steppers to test before and after. This might be a way to make servos and stepper motors even more efficient.

[307startup]

hignog...
I meant rotor, not windings. What's the difference between an induction motor...and say, every other type of electric motor? I don't care about brushed motors, just BLDC or BLAC motors.