90v 11.8A Motor, need controller

[nayr83333]

I have an old treadmill 90V DC motor that I have put on a Razor electric cart. I have replaced the speed controller with a 50V 40A PWM. Right now I have two sets of 4 12V batteries in series then paralleled the sets together for more run time. I would like to series all 8 batteries together so I can run at 96V and get the full output of this motor. My problem is I can't find a 100V DC controller. Any suggestions would be awesome. I am willing to build one if anyone can direct me.

 

[dcastillo]

heres a 72v
http://kellycontroller.com/kds72050e50a24v-72v-mini-brushed-controller-p-760.html

they have 120V but very expensive and designed for 100's of amps

 

[wesleyb82]

http://www.ebay.com/itm/200A-24-100...910?pt=LH_DefaultDomain_0&hash=item2a4ba7e58e

Never used this just thought it might help you.

Anyway how is the torque on this motor? I have read that these motors don't have much. Is that your experience as well?

 

[nayr83333]

I just got my setup out for a test run today. The speed and acceleration were not what I expected. Either my controller is causing a problem or the motor isn't powerful enough. I have ordered an awesome controller. 72-300v 250a. Got lucky on eBay. I don't think it's the motor because the treadmill was quite powerful and it was a 1:1 gear ratio. I have another bigger motor I will try if all else fails. I thought torque was relevant to the current draw. I'll have to research that a little more.

 

[nayr83333]

http://www.ebay.com/itm/200A-24-100...910?pt=LH_DefaultDomain_0&hash=item2a4ba7e58e

Never used this just thought it might help you.

Anyway how is the torque on this motor? I have read that these motors don't have much. Is that your experience as well?

I read up a little on torque from electrical motors and it seems to be somewhat universal. The faster they spin the less torque they have. This motor should have about 1.3 ft/lbs at 2600 rpm.