Re: 2.25 HP motor... what to do?
 

Must have run the idea round and round and ended up in the same place :) :
Take it apart and see what makes it tick.

Re: 2.25 HP motor... what to do?
 

How much does it cost and where'd you get it from. Two of these would be enough for my electric vehicle

Re: 2.25 HP motor... what to do?
 

Oh wait. Just remembered. you got them from a treadmill!
My faux pas
:o :o :o :o :o

Re: 2.25 HP motor... what to do?
 

Lots of people get those, in fact:http://www.ebay.com/itm/Pro-Form-Ico...em19e4 a397a7

That is the exact motor same flywheel and mount. Just put "2.25HP treadmill motor" into eBay.

Re: 2.25 HP motor... what to do?
 

Nice! That gives me a boost in looking for the proper motors for the DevyashMobile!
:D

Re: 2.25 HP motor... what to do?
 

Benchtop milling machine spindle motor upgrade. Zoom Zoom.

Re: 2.25 HP motor... what to do?
 

Just get a few more of these, a battery bank of Li-S batteries and zoom off in a go-kart at 60 MPH! :P
Just, don't get into a car accident going on the highways (In PHX, everyone drives at ~80MPH, so you would be outmatched by a car)
:D :D :D :D

Re: 2.25 HP motor... what to do?
 

I did the same thing last year, in my case the electronics of my parents treadmill broke but the motor was still good.

I thought about making a lathe out of it but never got around to it.

Re: 2.25 HP motor... what to do?
 

That's a nice idea. However, don't make it just a lathe! Make it into a CNC lathe by getting a couple more motors. Also, just build the motor controllers yourself from H Bridges cause Im guessing that you are aiming for something cheap!
Safety FIRST! ::safety:: ::safety:: ::safety:: ::safety:: ::safety::
^^I forgot where I heard that quote^^

Re: 2.25 HP motor... what to do?
 

Any realistic implementation of a CNC lathe is going to require quite a bit more components and will cost a bit more than "cheap" ;)

Re: 2.25 HP motor... what to do?
 

I'd be happy with a drill press. What sort of speeds do I need for wood/plastic, aluminum, and then steel?

Re: 2.25 HP motor... what to do?
 

I found this chart online. I gives recommended rpm for various types of bits and materials. There are also many other charts like this online. I would suggest finding a way to a just the speed depending on what you are drilling.

Re: 2.25 HP motor... what to do?
 

That chart is really a rule of thumb. In reality if you have a truely variable speed drive (not one that uses a power transmission with finite speeds like belts and pulleys) you can calculate the proper speed considering the drill type, bit diameter, material characteristics and feed rate (of the the bit into the material). It's the same set of calculations you'd find often used for CNC tools.

Course the real issue is that having PWM to drive the treadmill motor does not mean that the motor remains at a fixed speed when loaded (while drilling for example). To make this really work you need to close a feedback loop like a PID controller. A motor of this power is a more than FIRST speed control can handle.

Re: 2.25 HP motor... what to do?
 

techhelpbb is correct that some sort of feedback necessary to control the speed of a DC motor accurately.

An alternative is to use a 3-phase motor with a 3-phase motor controller. The motor RPM will follow the output frequency (not the PWM frequency) up to the maximum torque rating of the motor. Add a 10-turn potentiometer and you get infinitely variable speed without changing belts. It worked great on the drill press at the last place I worked at.