how to increase rpm from an elctric motor

Wow, hold on a minute: is that motor rated for that speed? Torque? Current? Noise?

Seriously, everything is possible for a price. The actual motor may not be able to do so, but a properly designed set should do. For starters, the bearings can't be regular run-of-the-mill bearings (usually, at those speeds, it might be air bearings). Then, you haven't told us what kind of motor it is (AC, DC. If AC - synchronous or asynchronous? If DC - with brushes or brushless?), what the application is about, what kind of load, and so on.

Trying to run said motor at x4 the rated speed will cause to disintegrate very quickly.

hi,

well the original motor was an AC 7kW motor. I need to get 11,250 rpm to drive a lead-screw. it dosent have to stick to this, I just need to get the 11,250 rpm!

this is all just theoretical, I am a mechanical engineering student and need to figure this out for a project.

thanks

troy

have you any idea of the motor you're considering? is it ac? is it dc? is it 500 HP? is it shaded pole?

with external gearing nearly any rpm is possible. some gearings cost $50,000. some are less.

with no info it's hard to give an answer. sammmm

You are stuck with gearing. Even if you could get the motor to run at the higher speed, you would have mechanical problems. Motors for such speeds are designed specifically for that.

Gonna drive a lead screw at 11,250 rpm with a 7kW motor? The mind boggles. What is the lead screw moving? You expect this screw to last how long? Something is wrong!