View Single Post
Old 11-26-2007, 10:16 AM   #186 (permalink)
MetroMPG
Batman Junior
 
MetroMPG's Avatar
 
Join Date: Nov 2007
Location: 1000 Islands, Ontario, Canada
Posts: 22,513

Blackfly - '98 Geo Metro
Team Metro
Last 3: 70.09 mpg (US)

MPGiata - '90 Mazda Miata
90 day: 52.71 mpg (US)

Even Fancier Metro - '14 Mitsubishi Mirage top spec
90 day: 70.75 mpg (US)

Appliance car - '14 Mitsubishi Mirage ES (base)
90 day: 60.16 mpg (US)
Thanks: 4,058
Thanked 6,957 Times in 3,602 Posts
11-29-2006, 12:31 Pm

Yes, that was certainly an important but undocumented missed step!

Some good news: Ivan opened up the sister motor and it looks like the wiring to the field is pretty straightforward. He disconnected both ends of the field circuit, jury rigged a patch in place to reverse them and got it to run "backwards". Also, the brushes appear to be set vertically, so they shouldn't pose a problem running opposite to the original direction of the commutator. (I'd read that some brushes are set on an angle, and that would pose a problem for reversing rotation.)

FYI for anyone interested in this, here's a link from the EV archive about 4- vs 2-terminal series motors that tipped me off to the potential roblem we were facing.

So we just have to make up a pair of "jumper" wires of the proper gauge to mod the motor to run in the direction we need it to.

Also fortunately, removing the e-motor from the car is not a huge job: maybe 10 minutes for 2 people. Much easier than the ICE removal
__________________
Project MPGiata! Mods for getting 50+ MPG from a 1990 Miata
Honda mods: Ecomodding my $800 Honda Fit 5-speed beater
Mitsu mods: 70 MPG in my ecomodded, dirt cheap, 3-cylinder Mirage.
Ecodriving test: Manual vs. automatic transmission MPG showdown



EcoModder
has launched a forum for the efficient new Mitsubishi Mirage
www.MetroMPG.com - fuel efficiency info for Geo Metro owners
www.ForkenSwift.com - electric car conversion on a beer budget
  Reply With Quote