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| Ev Archive for February 2001 |
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| 1152 messages, last added Wed Aug 08 18:51:05 2001 |
[Date Index][Thread Index]
Re: EV Grin Returns
Rod.Hower@ametek.com wrote:
> The problem with the Curtis was not just efficiency (which I can only
> guess is only 2% or so better on the DCP).
The efficiency of a PWM controller is tricky to measure. If you measure
just the controller itself, it will be in the high 90's. But, the ripple
current it causes in the batteries and motor cause additional losses.
Though these are hard to measure and thus usually ignored, they are
actually larger than controller losses. My guess would be 2% loss in the
controller itself, and another 2-5% loss each in the motor and
controller.
--
Lee A. Hart Ring the bells that still can ring
814 8th Ave. N. Forget your perfect offering
Sartell, MN 56377 USA There is a crack in everything
leeahart_at_earthlink.net That's how the light gets in - Leonard Cohen
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