[ausev] Motorcycle project, rear differential.

[Chris Robison]

On Wed, November 1, 2006 10:00 am, Charlesvsi at aol.com said:
>
>
> It seems to me that 2 electric motors would handle the task better than a
> differential. I found a web site in Italy that had controllers  motors,
> etc  at
> it. II'l check and see if I can find it again. Cars with 2 or 4 electric
> motors have controllers with software that senses the drag on the motors
> and
> shifts power to the one that needs it. electrically its easy to sense this
> and
> change the voltage or phase shift.
> Chuck

DC motors in parallel or with separate controllers do this automatically. 
In the sense of simple differential action the difference between speeds
is negligible, but in the sense of wanting some sort of limited slip
differential, the motors automatically behave in a favorable way.

The slower turning motor (the one that has grip) naturally draws more
current and therefore delivers more power.  The slipping, freespinning
wheel draws less current.

However, one problem with this solution is duplicate gearing. Unless
you're using hub motors, each motor will need its own set of reduction
gears, and this might be heavier than connecting the motor (or inline pair
of motors) to a single rear differential, where the reduction may be
achievable just in the rear end ratio.  And if you need multiple gears (a
transmission), then a normal tranny/diff setup is the only practical way
to go.

  --chris