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Old 11-25-2010, 04:25 AM   #4056 (permalink)
Greg Fordyce
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Join Date: Nov 2009
Location: Scottish Borders, Scotland
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Quote:
Originally Posted by harlequin2 View Post
It powers two Advanced L91 motors connected in series and driven by 45 x Li cells also in series giving 144v. Pushes a 1988 BMW 318 (E30) along the road with direct drive ie no clutch or gearbox.
Top speed is just 100 kph and acceleration from 0 to 80 kph is about 12 seconds. I did have the motors connected in parallel at one stage and that gave a top speed of about 130 kph but the acceleration was very snail like. So, not enough torque (current) for good acceleration with parallel connection and not enough volts for good top speed with serial connection. Have to figure out a switch!
Series to parallel shifting can be done with contactors and is common in drag racing. The Killa cycle uses this for example. A bit of googleing should reveal the setup. Congratulations on getting on the road.

Greg
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