[ausev] TRANSMISSION

[JohnFM]

You generally do not need a tranny for an AC system which offers
better continuous torque, this also provides better uphill climbing
power as well as the possibility of regenerative breaking. Many
factory manufactured EVs have this type of system, until you get into
higher speeds neccesitating more gear ratios. The Tesla Roadster for
example, (correct me if I am wong) had a single speed initially due to
manufacturing problems, but reach it's true performance goals it has a
2 speed tranny now.




On Thu, Dec 18, 2008 at 9:21 AM, Jim Watson <osious at gmail.com> wrote:
> I am new to the club. I am VERY happy to know that you guys exist. Also I am
> very unhappy that Opec and car companies insist on making shity high
> maintenance gas cars.
>
>  I have had a question about gear boxes and transmissions for a long time. I
> have read on one site that in converting a gas to an electric you need to
> leave the 5 speed (or what ever it is) transmission in the car to be used
> with the electric motor.
>
> I understand that electric motors have full power the second the shaft turns
> and all the way up to max. RPMs (10,000 rpms). I know that gas engines only
> have power between 1000 - 3,500 rpms. It is obvious that gas motors need a
> transmission. But right now I am under the impression that electric motors
> don't need a transmission. I think trains have a motor built right on to the
> axle. If an electric motor can break that kind of static friction to move a
> freaken train with out a trani then why would you need a trani for a car.
> The diesel motor on the train powers a generator,.... I have heard that the
> trani used in the EV1 & RAV4-ev was a "single speed reduction integrated
> with the motor and differential, to help with torque. I have also read that
> the Owen Magnetic made a car, before the depression, moved by an electric
> motor that did not have a trani. It was sold to rich people. Some electric
> motor companies will sell gear down boxes with their motors. To not have a
> trani in the car would mean WAY less friction losses and less
> maintenance,....
>
> My question is do you need a trani for an electric car or not. Are my facts
> straight,... I am ready to be educated. Thanks for your time folks.
>
> Jim
>
> _______________________________________________
> AusEV mailing list
> AusEV at austinev.org
> http://www.austinev.org/mailman/listinfo/ausev
>
>