2.25 HP motor... what to do?
 

So I happend to "accidentally" carefully extract the motor and Its supporting electrical equipment from my moms treadmill. It is rated for 2.25 HP (1.3 continuous) and though it doesn't say, from reasurching I have deduced its free speed to be about 6,500-7,000rpm (I will measure this empirically soon). 95vdc 18A. What should I do with it?

Re: 2.25 HP motor... what to do?
 

Options:
Put it back in
Sell it on eBay
Build something

The whole 95VDC doesn't make it super easy to use.

Re: 2.25 HP motor... what to do?
 

The treadmill must have the appropriate converter with it.

Re: 2.25 HP motor... what to do?
 

Hasn't she noticed that the walking takes a bit more effort?

Re: 2.25 HP motor... what to do?
 

Build a boat motor for the upcoming water game.

Re: 2.25 HP motor... what to do?
 

90 volt variable speed DC drives are common. Sort of the standard voltage for industrial DC drive. Comes from the supply voltage being 110 AC. (At least in the states) The 18 amps is at rated power which will be at some speed between free speed & stall.

Lots of people use motors out of tread mills for mini lathes & tools like that.

Re: 2.25 HP motor... what to do?
 

Hide it in a CIM casing and try to get it through inspection next year.

Re: 2.25 HP motor... what to do?
 

The motor has a controller that inputs 120VAC, 12V pwm, and outputs the 95volts. I think the best option is to see what the pwm the control panel sends to the controller looks like and replicate it.

Re: 2.25 HP motor... what to do?
 

I ended up throwing the treadmill motor I had onto the scrap trailer....

Re: 2.25 HP motor... what to do?
 

Build a treadmill.

Re: 2.25 HP motor... what to do?
 

Well here's a little info on it:

http://www.instructables.com/id/Use-...ontr/?ALLSTEPS

It woulddd be fun to put on a GoKart :D
95v at 18amps is 1710 watts which is like almost 3HP...

But I am a bit biased.

Re: 2.25 HP motor... what to do?
 

That is some loose chain! Try using a half-link or 3 :p

Re: 2.25 HP motor... what to do?
 

Tensioners were built in soon afterwards. That chain was way to loose lol, i was skipping teeth when flooring it.

Going to Gt2 timing belt soon.

Re: 2.25 HP motor... what to do?
 

Sell it on eBay, there are indeed many folks looking for exactly a motor like that so they can have a variable-speed lathe or mill. It's worth quite a few dollars.

Re: 2.25 HP motor... what to do?
 

After returning to this thread I now realized a very good question...

WHY/HOW COULD YOU TAKE OUT THE MOTOR FROM THE TREADMILL?

Sorry for the caps but I find it necessary.

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.