Re: [EVDL] ADC 9 air flow requirements, comments.
From: Bob Rice
> All this cooling bahoura, with the 9 inch motors! My 8 years of driving
> a ADV 9" rebuilt by Warfield Electric; Never an issue with cooling! ...
If you drive with the motor at high RPM most of the time, then its internal fan does a fine job. I don't have an external blower on my EV either.
However, many first-time EVers (and even some old timers) drive as if the electric motor were an ICE -- they try to shift to keep it at low RPM. This has the consequence of making the motor draw more current, so it makes more heat. It also gets less cooling air, so it runs too hot.
Another problem occurs with direct drive EVs, where there is no transmission. Here, you can't shift to make the motor's internal fan work at low driving speeds.
Finally, some people are using undersized motor to save money, or simply for the sake of expediency.
If any of these cases apply, an external blower helps a lot!
--
"Excellence does not require perfection." -- Henry James
--
Lee A. Hart, 814 8th Ave N, Sartell MN 56377, leeahart-at-earthlink.net
_______________________________________________
For subscription options, see
http://lists.sjsu.edu/mailman/listinfo/ev
From: Bob Rice
> All this cooling bahoura, with the 9 inch motors! My 8 years of driving
> a ADV 9" rebuilt by Warfield Electric; Never an issue with cooling! ...
If you drive with the motor at high RPM most of the time, then its internal fan does a fine job. I don't have an external blower on my EV either.
However, many first-time EVers (and even some old timers) drive as if the electric motor were an ICE -- they try to shift to keep it at low RPM. This has the consequence of making the motor draw more current, so it makes more heat. It also gets less cooling air, so it runs too hot.
Another problem occurs with direct drive EVs, where there is no transmission. Here, you can't shift to make the motor's internal fan work at low driving speeds.
Finally, some people are using undersized motor to save money, or simply for the sake of expediency.
If any of these cases apply, an external blower helps a lot!
--
"Excellence does not require perfection." -- Henry James
--
Lee A. Hart, 814 8th Ave N, Sartell MN 56377, leeahart-at-earthlink.net
_______________________________________________
For subscription options, see
http://lists.sjsu.edu/mailman/listinfo/ev