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| Ev Archive for May 1999 |
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| 1368 messages, last added Wed Aug 08 18:45:17 2001 |
[Date Index][Thread Index]
direct drive
>EVs designed from scratch rarely have a transmission.
Only if they are AC or brushless PM, which allows 10-14:1 reduction.
They just use a BIG
>motor and controller. Instead of getting a 2:1 torque multiplication with the
>transmission, you get it with 2 times the current in the motor and controller.
>Though as is being discussed, you can do it with 2 motors and 2 controllers,
>too. Or 2 motors, 1 controller, and a series/parallel switch.
DC direct drive will use massive amps on start up due to need for 4-6:1
reduction for top speed. It will be inefficient and have low range. But I
repeat myself.....
GF
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