torque of 9" dc with 144v pack? - DIY Electric Car Forums
Go Back  

DIY Electric Car Forums > EV Conversions and Builds > Electric Motors

Register Blogs FAQ Members List Social Groups Calendar Search Today's Posts Mark Forums Read

Reply
 
Thread Tools Display Modes
  #1  
Old 03-23-2011, 08:45 PM
dtbaker's Avatar
dtbaker dtbaker is offline
Senior Member
 
Join Date: Jan 2008
Location: santa fe, nm
Posts: 4,000
dtbaker is on a distinguished road
Default torque of 9" dc with 144v pack?

...trying to make sure tranny can handle it... what is the max torque delivered by 9" DC motor w/ 144v pack? can't find a graph to answer from ADC or Netgain, or maybe I am reading them wrong.
__________________
Dan
http://www.envirokarma.org/ev - '97 Suzuki Swift
http://www.envirokarma.org/ev2_mx5e - '94 Mazda MX5 Miata
Reply With Quote
Sponsored Links
Advertisement
 
  #2  
Old 03-23-2011, 09:18 PM
gottdi
Guest
 
Posts: n/a
Default Re: torque of 9" dc with 144v pack?

You control the torque with amps and voltage. The voltage won't give you torque but amps will. It then depends upon what your controller can belt out. That is why I say you want a controller that will belt out better than 500 amps when you need it or want it. Not that you have to do that all the time mind you. So a Soliton can belt out more amps into the motor than my synkromotive which can belt out more than the typical Curtis. The Zilla 2K beats them all. Or you could just go with a contact switch and have full amps available like right now but no control of the amps. Then it depends upon if your batteries can provide the level of amperage you desire. My 1C 100 AH cells cant belt out more than what my synkro can tolerate. I'd bet the new TS cells could over power my Synkromotive if I did not limit my current.

So you see there are many variables. Can't answer your question.

Pete
Reply With Quote
  #3  
Old 03-23-2011, 09:21 PM
dtbaker's Avatar
dtbaker dtbaker is offline
Senior Member
 
Join Date: Jan 2008
Location: santa fe, nm
Posts: 4,000
dtbaker is on a distinguished road
Default Re: torque of 9" dc with 144v pack?

ok, lets add the restriction of '144v at 500 battery amps'.
__________________
Dan
http://www.envirokarma.org/ev - '97 Suzuki Swift
http://www.envirokarma.org/ev2_mx5e - '94 Mazda MX5 Miata
Reply With Quote
  #4  
Old 03-23-2011, 09:48 PM
tomofreno tomofreno is offline
Senior Member
 
Join Date: Mar 2009
Posts: 2,210
tomofreno will become famous soon enough
Default Re: torque of 9" dc with 144v pack?

ADC FB1 4001 gives about 110 lb-ft at 500A irregardless of voltage.

FB1 4001 torque spd.jpg
Reply With Quote
  #5  
Old 03-23-2011, 09:49 PM
EVfun's Avatar
EVfun EVfun is offline
Senior Member
 
Join Date: Mar 2010
Location: Seattle, WA
Posts: 2,104
EVfun will become famous soon enough
Default Re: torque of 9" dc with 144v pack?

Quote:
Originally Posted by dtbaker View Post
ok, lets add the restriction of '144v at 500 battery amps'.
The voltage is irrelevant to torque, it will apply to the rpms where full torque is available, but torque is a matter of amps with a series wound motor.

The ADC 9 inch motor and WarP 9 motor (not Impulse 9 motor) that are commonly used will make about 100 ft-lb of torque at 500 amps. With a 144 volt pack that sags to about 126 volts at 500 amps you can expect to make peak torque from 0 rpm to about 3700 rpm. You will have about 71 HP at about 3700 rpm.
Reply With Quote
  #6  
Old 03-23-2011, 10:02 PM
tomofreno tomofreno is offline
Senior Member
 
Join Date: Mar 2009
Posts: 2,210
tomofreno will become famous soon enough
Default Re: torque of 9" dc with 144v pack?

Quote:
With a 144 volt pack that sags to about 126 volts at 500 amps you can expect to make peak torque from 0 rpm to about 3700 rpm.
Really? Looks more like 2700 - 2800 rpm to me from the torque-speed curves, but I have no real experience with it. Edit: Whoops, sorry, I was reading the graph incorrectly, looks like around 3400 rpm on the graph so 3700 seems reasonable.

Last edited by tomofreno; 03-23-2011 at 10:13 PM.
Reply With Quote
  #7  
Old 03-24-2011, 05:31 AM
Yabert's Avatar
Yabert Yabert is offline
Senior Member
 
Join Date: Feb 2010
Location: Québec, Canada
Posts: 1,085
Yabert is on a distinguished road
Default Re: torque of 9" dc with 144v pack?

Quote:
Originally Posted by dtbaker View Post
...trying to make sure tranny can handle it....
Your tranny can maybe take 100 lbs-ft at the input..... but if you have small tire, they can't transmit all this torque to the ground! (especially in first, second and third gear). So, the wheels spin and the input torque at the transmission is lower than 100 lbs-ft.
__________________
My Smart Fortwo high power! 38 000+ EV Km
http://www.diyelectriccar.com/forums...ion-51472.html
Reply With Quote
  #8  
Old 03-24-2011, 10:45 AM
dtbaker's Avatar
dtbaker dtbaker is offline
Senior Member
 
Join Date: Jan 2008
Location: santa fe, nm
Posts: 4,000
dtbaker is on a distinguished road
Default Re: torque of 9" dc with 144v pack?

excellent info, exactly what I need to ask the next question.

If I can expect torque of about 110 ft# from 500 amps... but want more and go out and get a controller capable of delivering say 1000amps the question becomes 'how long can I put 1000 amps into a 9" DC motor before I have thermal problems', and would the 1000 amp controller deliver 220 ft#.

the followup question would be along the lines of which would have thermal problems first, the motor or Thundersky/CALB cells that were being asked to deliver 10C ?
__________________
Dan
http://www.envirokarma.org/ev - '97 Suzuki Swift
http://www.envirokarma.org/ev2_mx5e - '94 Mazda MX5 Miata
Reply With Quote
  #9  
Old 03-25-2011, 06:11 AM
GerhardRP GerhardRP is offline
Administrator
 
Join Date: Nov 2009
Posts: 499
GerhardRP is on a distinguished road
Default Re: torque of 9" dc with 144v pack?

Quote:
Originally Posted by dtbaker View Post
...trying to make sure tranny can handle it... what is the max torque delivered by 9" DC motor w/ 144v pack? can't find a graph to answer from ADC or Netgain, or maybe I am reading them wrong.
You might look at some calculations I did a while back, particularly the curves at the bottom: http://www.diyelectriccar.com/forums...t=motor+theory
I think the first thing to go is the Commutator at about 100kW, but your battery pack wont quite deliver that.
Gerhard
P.S. Note that there is still an unresolved discrepancy between Netgain's published curves and data from forum members.
Reply With Quote
  #10  
Old 07-04-2011, 06:46 PM
ElectriCar's Avatar
ElectriCar ElectriCar is offline
Administrator
 
Join Date: Jun 2008
Location: Reidville, SC
Posts: 1,849
ElectriCar is on a distinguished road
Default Re: torque of 9" dc with 144v pack?

Quote:
Originally Posted by dtbaker View Post
excellent info, exactly what I need to ask the next question.

If I can expect torque of about 110 ft# from 500 amps... but want more and go out and get a controller capable of delivering say 1000amps the question becomes 'how long can I put 1000 amps into a 9" DC motor before I have thermal problems', and would the 1000 amp controller deliver 220 ft#.

the followup question would be along the lines of which would have thermal problems first, the motor or Thundersky/CALB cells that were being asked to deliver 10C ?
I have that motor and a Curtis 1231C which I'm having upgraded to 1000A. I can get you the guy's info if you're interested. It's a $650 upgrade which will also make it run cooler for a given voltage. Since I upped my voltage I'm having heat problems even in cooler night time temps. I'm also adding a heatsink but reducing the source of heat will help as well. He said likely I wouldn't need fans after the upgrade as long as I had the heatsink installed. Now that would really be an improvement!

I am working to get my truck to be as functional as the gas version. Now at highway speeds it overheats if trying to maintain 65-70mph. The guy told me it's the diodes inside which create a lot of heat at 160-165V.
Reply With Quote
Reply

Share or Bookmark this

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

 
Support DIY Electric Car
Sponsors

All times are GMT -6. The time now is 01:34 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.

Ad Management by RedTyger