Re: Production EVs

[bdube@boulder.nist.gov (Bill Dube')]

>bdube@boulder.nist.gov (Bill Dube') writes:
>
>>    The stall torque on a series-wound DC motor is enourmous. If you were
>>able to stop the wheels from turning somehow, something would have to "give"
>>in the driveline. Perhaps it would be the clutch. It might be the
>>differential, but the motor *will* turn. 
>
>True, DC motors have enormous torque.  But brakes in good trim have
>enormous stopping power. 
>
>The front brakes are usually much stronger than the rears, mainly because
>a car in hard braking will "nose forward" and put most of its weight on
>the front wheels.  On a car with traditional 60/40 balance, it can be 
>doing as much as 90% of the braking.  


    I can easily lock up all four wheels on my Wabbit with the brakes. I
can't stop the car from moving forward using the brakes even at part
throttle if the car is in 2nd gear. If I put on the parking brake with both
hands, the motor will turn the front wheels, and because there is more
weight on the front wheels, the back wheels will be locked, but will drag
forward, even at part throttle.
             _   /|             
             \'o.O'              Bill Dube'
           =(___)=           bdube@boulder.nist.gov
              U