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Old 11-26-2007, 11:16 AM   #186 (permalink)
MetroMPG
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Join Date: Nov 2007
Location: 1000 Islands, Ontario, Canada
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Blackfly - '98 Geo Metro
Team Metro
Last 3: 70.09 mpg (US)

MPGiata - '90 Mazda Miata
90 day: 52.07 mpg (US)

Winter beater Metro - '00 Chevrolet Metro
90 day: 61.98 mpg (US)

Fancy Metro - '14 Mitsubishi Mirage top spec
90 day: 58.72 mpg (US)

Even Fancier Metro - '14 Mitsubishi Mirage top spec
90 day: 70.75 mpg (US)
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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
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Mitsu mods: Oops, I did it again! Bought another cheap, 3-cylinder Mirage. Mods in progress...
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www.MetroMPG.com - fuel efficiency info for Geo Metro owners
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