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Re: (ET) E20 motor at 48V

On the Alltrax you indeed can enable FW by plugging in a computer and changing the parameters. It does make a noticeable difference. My primary gripe with it is that it engages very abruptly - it's sort of an all or nothing proposition wherein you go from your normal sorta pokey top speed to HELLO! At the transition point the throttle has no smooth linearity, so if you're wanting to go a bit faster than normal top, but not the "maximum" top that FW gives, you're likely to get mild whiplash as you cycle in and out of FW...
That being said, I appreciate having the FW - it has sped up my chores at times... 

Steve W.



On Jan 4, 2008, at 10:00 AM, David Roden wrote:


....
FWIW, the Alltrax ET controller, which I'm pretty sure was really explicitly designed for the E15 motor (though it may work OK with other ET motors), does have field weakening. Last I heard FW was not enabled by default, but could be turned on in the software (the "turbo" button). Its control is more sophisticated than the original GE design (duh), but the intent of its FW is about the same - to provide higher top speed under light load, but to 
maintain torque with heavy loads.
For light load applications I don't think there'd be any harm in running at 
48 volts.  I probably wouldn't try it if my machine were used for for
plowing, dozing, or towing. I don't really see much benefit though. Flat- out in D2 seems plenty fast to me. Especially with the entertaining and invigorating brakes GE fitted, how much faster do you really want to go? 


David Roden - Akron, Ohio, USA

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