If you are using a Zilla controller, which most EMs are not, then the logic can be built into the controller as an option and the hairball will control the switchover for you. If not you get to build your own circuit, which is not terribly complicated. Eihter way the contactors all need to be able to handle full load, so they are relatively large (for squeezing into a motorcycle) and expensive. It works very well. It's like having a two speed transmission. You get incredible torque by starting out in series and extend your top speed by switching to parallel. For me on a single gear ratio motorcycle however, I like the simplicity of one larger motor and a controller that can dish out more amps. damon
> Date: Mon, 5 May 2008 10:51:19 -0700> From: [EMAIL PROTECTED]> To: > listserv@electricmotorcycles.net> Subject: Re: [ElectricMotorcycles] > series-parallel 2 motors> > and how do you automate the switchover, or is it > just manual?> > j> > Andrew Wowk wrote:> > To do series/parallel switching I > think you need two poles, and one of those> > needs to be double throw. So it > could be done with a DPDT switch for low> > power systems, and a reversing > contactor for high power systems. Or one SPST> > contactor, and one SPDT > contactor.> > > > Regards,> > Andrew in NM> > > > On Mon, May 5, 2008 at > 11:31 AM, damon henry <[EMAIL PROTECTED]> wrote:> > > >> You use contactors > to physically rewire the motors. In series both motors> >> see the same > current in parallel they both see the same voltage.> >>> >> damon> >> _________________________________________________________________ Get Free (PRODUCT) RED™ Emoticons, Winks and Display Pics. http://joinred.spaces.live.com?ocid=TXT_HMTG_prodredemoticons_052008
