Controller throttle response

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EVguru
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Postby EVguru » Tue Jul 24, 2007 4:17 pm

I don't think Alltrax controllers are more efficient than the equivilent Curtis, I KNOW they are more efficient.

They have lower conduction losses because they use Mosfets with a lower Rds-on rating. They also use a much faster turn-on/off time and so have lower switching losses. Many people are using the Alltrax without any additional heatsinking, I wouldn't risk it with a Curtis. The Alltrax is not usually fitted as an OEM controller, but it is often fitted as an upgrade for higher performance or to replace a failed Curtis.

I used to race electric vehicles with the people who designed the Alltrax and they originally got into controller design becuase the Curtis often wasn't up to the job (To be fair, one which it wasn't designed for).

Amatuer builds and prototypes are exempt from CE and EMC and non compliant components can in any case be used as part of an overall compliant installation.
Paul

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MalcolmB
Posts: 423
Joined: Sat Jun 23, 2007 8:07 pm

Postby MalcolmB » Tue Jul 24, 2007 4:22 pm

Already sent you a pm Dave. Many thanks for the offer, but as you mentioned, the Curtis 1209/1221 doesn't have the programming options of the Alltrax and I'd rather not sacrifice those just now. I will do some more research into the Curtis controllers though, as I see a lot of people use them on the Austin EV website.
The lack of CE approval is an interesting point that I hadn't considered before, although I believe it applies to the Etek motor as well. I sent a copy of the Etek manual to my insurer before they gave me a quote, and they seemed quite happy with that.


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