Please post future off the topic of EVT America Z-20a and Z-20b replies about the Xtreme XM-2000 here.
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Please post future off the topic of EVT America Z-20a and Z-20b replies about the Xtreme XM-2000 here.
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(A) To address the desirableness of the feature: One advantage that can be seen is that the low speed setting does stress the batteries less for 0 to 20 mph acceleration - even when accelerating at the same rate. This is indicated by seeing less voltage drop when using low speed. Therefore, I'd say that it is a worthwhile feature.
(B) To address the torque characteristics: There are many different types of DC motors (series and shunt being just two) - they have different torque characteristics - so PJD's comment although true seems a little broad to apply to this situation. As usatracy points out we need to know much more about (a) the nature of the motor windings & (b) the nature of the shifting mechanism to figure anything more out in theory. However, in practice see (A) - it is worthwhile for me.
FWIW, my guess is that it's enacting different windings. I'm sure usatracy will take his motor apart soon ;-)
John H.
Blue XM-2000
Ann Arbor, MI
http://www.revevllc.com
John H. Founder of Current Motor Company - opinions on this site belong to me; not to my employer
Remember: " 'lectric for local. diesel for distance" - JTH, Amp Bros || "No Gas.