[chbot] Scooter controllers

[Mark Atherton]

Double pole change over relay is all you need to swap two phase to 
make it go backwards

Best engaged when the motor has stopped, otherwise people/things may 
be in for a bit of a surprise

-mark

At 10:35 a.m. 14/12/2014, you wrote:
>The scooter controllers I've looked at are brushless dc controller 
>with 3 phases and an half-bridge per phase.
>Don't remember if reverse was an option.
>/s
>
>On 14 December 2014 at 00:12, Robin Gilks <robin at gilks.org> wrote:
>Greetings all
>
>Something for you all to think on before Monday - do cheap Chinese scooter
>controllers (irrespective on how they rate power capability) have reverse
>(i.e. a bridge) or are they in the main just series FETs. Most seem to be
>advertised as scooter/ebike controllers - and a bike doesn't need to go
>backwards!!
>
>Those that I used to have access to used a 0-5 volt signal with 2.5 being
>stopped, 0 as full reverse and 5 as full speed forward. I can probably get
>a couple of these but 10 bucks to china is much cheaper although I doubt
>I'll see anything this side of Xmas!
>
>Cheers
>
>--
>Robin Gilks