Go Back   EcoModder Forum > EcoModding > Fossil Fuel Free > Open ReVolt: open source DC motor controller
Register Now
 Register Now
 

Reply  Post New Thread
 
Submit Tools LinkBack Thread Tools
Old 04-27-2010, 09:39 PM   #1 (permalink)
EcoModding Lurker
 
Join Date: Apr 2010
Location: Ithaca NY USA
Posts: 6
Thanks: 1
Thanked 0 Times in 0 Posts
Controlling a big sepex

I am rebuilding an old SCT electric Rabbit. It has a shunt/sepex motor in it and a 108 volt battery. Currently, it has a controller on the field but not on the armature. It runs by idling the motor at full field; you let out the clutch to start and weaken the field to speed up. I want to install a controller on the armature, so I can raise the voltage to the motor's rated 144 and get better performance on hills. Will the open source controller work for that? I understand that, without the series field, there is not enough inductance for some controllers to work well. Would that be an issue here? Another question is regen. The car has it, and I want to keep it. Will it work to simply put a big diode across the controller to carry the regen current to the battery, or is it more complicated?

thanks,

Steve Gaarder

  Reply With Quote
Alt Today
Popular topics

Other popular topics in this forum...

   
Old 04-28-2010, 11:29 AM   #2 (permalink)
PaulH
 
MPaulHolmes's Avatar
 
Join Date: Feb 2008
Location: Maricopa, AZ (sort of. Actually outside of town)
Posts: 3,831

Michael's Electric Beetle - '71 Volkswagen Superbeetle 500000
Thanks: 1,367
Thanked 1,115 Times in 730 Posts
The syncronous rectification controller I think can be modified pretty easily to power a sepex motor. But if you already have a controller for the field, then I don't see why it would be a problem for the standard controller controlling the armature. With smaller inductance, it would mean current changes faster, which would mean possibly changing the P and I constants for the PI loop. I think jackbauer is running a sepex motor with the open source control board, and a custom IGBT controller. It's 11" diameter too.
__________________
kits and boards
  Reply With Quote
Old 05-23-2010, 09:38 PM   #3 (permalink)
EcoModding Lurker
 
Join Date: Apr 2010
Location: Ithaca NY USA
Posts: 6
Thanks: 1
Thanked 0 Times in 0 Posts
Quote:
Originally Posted by MPaulHolmes View Post
The syncronous rectification controller I think can be modified pretty easily to power a sepex motor.
Which controller are you referring to? While I do have a controller for the field, I expect that there are significant pluses to having one controller do the whole job.

thanks,

Steve Gaarder
  Reply With Quote
Old 05-23-2010, 10:49 PM   #4 (permalink)
PaulH
 
MPaulHolmes's Avatar
 
Join Date: Feb 2008
Location: Maricopa, AZ (sort of. Actually outside of town)
Posts: 3,831

Michael's Electric Beetle - '71 Volkswagen Superbeetle 500000
Thanks: 1,367
Thanked 1,115 Times in 730 Posts
Oh, I finished a control board for a synchronous rectification controller, which can be modified (by changing software only) to control 2 separate coils.
__________________
kits and boards
  Reply With Quote
Old 05-24-2010, 03:03 AM   #5 (permalink)
Master EcoModder
 
jackbauer's Avatar
 
Join Date: Sep 2009
Location: Ireland
Posts: 734
Thanks: 26
Thanked 296 Times in 168 Posts
hey paul whats the odds on my getting hold of one of those boards?
__________________
Now, Cole, when you shift the gear and that little needle on the ammeter goes into the red and reads 2000 Amps, that's bad.
www.evbmw.com
  Reply With Quote
Old 05-24-2010, 03:52 AM   #6 (permalink)
PaulH
 
MPaulHolmes's Avatar
 
Join Date: Feb 2008
Location: Maricopa, AZ (sort of. Actually outside of town)
Posts: 3,831

Michael's Electric Beetle - '71 Volkswagen Superbeetle 500000
Thanks: 1,367
Thanked 1,115 Times in 730 Posts
Hi Jack! I'll definitely send you one. I just need to order them. Here's the sequence of events that probably need to happen:

Somehow get $1000 for Eagle.
Send in the board to China (pcb cart is CHEAP!)
That's it...

/////////////////////////////////////////////////////////////////
Instead, I will probably do the following:
Send the board to that one super expensive place. Get like 3 of those friggen things for like $300 and feel real sad inside.
////////////////////////////////////////////////////////////////
Option 3 is to send it to that one company that's quite a bit cheaper, but I need to get screen shots of it I think. I just need to do that. The bms and charger are ready for testing, so I'll do that first I guess. IT won't be long now for the control board.
__________________
kits and boards
  Reply With Quote
Old 05-24-2010, 09:38 PM   #7 (permalink)
ReVolt Enthusiast
 
Join Date: Jun 2009
Location: Michigan, USA
Posts: 239
Thanks: 98
Thanked 41 Times in 36 Posts
Quote:
Originally Posted by MPaulHolmes View Post
Here's the sequence of events that probably need to happen: Somehow get $1000 for Eagle.
Hey Paul,

I have a copy of Eagle Pro V5.9.0 that I can send out to you next week.

Let me know if you want it.

- Mark
  Reply With Quote
Old 05-24-2010, 10:32 PM   #8 (permalink)
Moderate your Moderation.
 
Join Date: Nov 2008
Location: Troy, Pa.
Posts: 8,919

Pasta - '96 Volkswagen Passat TDi
90 day: 45.22 mpg (US)
Thanks: 1,369
Thanked 430 Times in 353 Posts
Ithaca, NY = ~1 hr drive from me. Cool.

Is this "Rabbit" a VW car?
__________________
"ʞɐǝɹɟ ɐ ǝɹ,noʎ uǝɥʍ 'ʇı ʇ,usı 'ʎlǝuol s,ʇı"

  Reply With Quote
Old 05-28-2010, 12:11 PM   #9 (permalink)
EcoModding Lurker
 
Join Date: Apr 2010
Location: Ithaca NY USA
Posts: 6
Thanks: 1
Thanked 0 Times in 0 Posts
Quote:
Originally Posted by Christ View Post
Ithaca, NY = ~1 hr drive from me. Cool.

Is this "Rabbit" a VW car?
Yes, It was converted when new in 1982 or thereabouts by South Coast Technologies.
  Reply With Quote
Old 05-28-2010, 12:58 PM   #10 (permalink)
EcoModding Lurker
 
Join Date: Apr 2010
Location: Ithaca NY USA
Posts: 6
Thanks: 1
Thanked 0 Times in 0 Posts
Quote:
Originally Posted by MPaulHolmes View Post
Oh, I finished a control board for a synchronous rectification controller, which can be modified (by changing software only) to control 2 separate coils.
Let me see if I have this right: a synchronous rectification controller uses MOSFETs instead of the commutating diodes, and so the controller board has a second output to control those MOSFETs. What I could do is use this controller board with two diode-based power boards, one for the armature and one for the field, and rework the software to handle this. Is this correct?

thanks,

Steve Gaarder

  Reply With Quote
Reply  Post New Thread


Thread Tools


Similar Threads
Thread Thread Starter Forum Replies Last Post
Touchy subject - Big Bang Theory (not the religious argument) robchalmers General Efficiency Discussion 11 08-26-2009 05:27 PM
Neil Young's Ideas to Save the Big 3 SuperTrooper The Lounge 1 11-22-2008 02:29 PM
Big Surprise: Fuel efficient cars are holding their value better than other cars SVOboy EcoModder Blog Discussion 2 09-19-2008 08:52 AM
Alternative to big motor and big $$$? WaxyChicken Fossil Fuel Free 16 01-28-2008 11:02 PM



Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2020, vBulletin Solutions Inc.
Content Relevant URLs by vBSEO 3.5.2
All content copyright EcoModder.com