Mr Whippy
|
posted on 9/1/13 at 11:37 PM |
|
|
Anyone built a twin motor toylander?
Yeah about to start one myself, just got all the wood but got a question about the twin motor control
If you've tried it did you have to lift the throttle while cornering as the manual doesn't make much sense since it seems to say the speed
controller gets confused if powered round a corner but also says you get a differential effect with motors connected in series...like make you mind
up?!
did ask on the toylander forum and got no reply's
I know some on here have done them in the past so thought I'd ask here too
Any ideas? thanks
|
|
|
ashg
|
posted on 10/1/13 at 12:09 AM |
|
|
Adrian Reeve built one for his kids.
Anything With Tits or Wheels Will cost you MONEY!!
Haynes Roadster (Finished)
Exocet (Finished & Sold)
New Project (Started)
|
|
Mr Whippy
|
posted on 10/1/13 at 12:12 AM |
|
|
quote: Originally posted by ashg
Adrian Reeve built one for his kids.
thanks, I'll send him a U2U
|
|
bi22le
|
posted on 10/1/13 at 08:52 AM |
|
|
I design wheelchairs for a living and knowing that they have casters but toylanders have functional front wheels the difference would be minimal.
I could imagine that unless the grip levels change the torque from the drive motors would push through the fronts and it would go straight on.
Would love to see a build log if you have time to do one.
Track days ARE the best thing since sliced bread, until I get a supercharger that is!
Please read my ring story:
http://www.locostbuilders.co.uk/forum/13/viewthread.php?tid=139152&page=1
Me doing a sub 56sec lap around Brands Indy. I need a geo set up! http://www.youtube.com/watch?v=EHksfvIGB3I
|
|
MikeRJ
|
posted on 10/1/13 at 12:18 PM |
|
|
Two DC motors in series will act very much like an open diff; slow one down and the other will speed up. However, if the speed controller is doing
anything tricky like measuring motor speed by commutation current changes, then two motors in series is quite likely to cause problems. A simple open
loop PWM controller should be fine though.
|
|
Mr Whippy
|
posted on 10/1/13 at 12:45 PM |
|
|
Thanks for the replys
Am I right in thinking then I should be looking at an open loop controller rather than one that is trying to maintain a set speed, maybe that's
why the controller would get confused if two motors are turning at different speeds?
I have been looking around see some 24v 500w PWM controllers for just £28, might give them a look at as the toylander one is vasty more expensive
cheers
|
|
rf900rush
|
posted on 10/1/13 at 12:49 PM |
|
|
I would agree with MikeRJ
Speed controllers without EMF feedback should be ok.
Worst case loading would be both motors stalled. Starting on a corner will have one motor loaded less, the other more.
Current building a Toylander 2 , and one the finishing stage.
But I am using a 24 V mobility scooter motor.
Will very likely build my own speed controller.
|
|
coyoteboy
|
posted on 10/1/13 at 01:01 PM |
|
|
Two motors in series with a constant speed controller would be a very poor design. TBH two motors in series is a bit weird too but it'll work if
it's voltage controlled, rather than speed or current controlled.
|
|