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| Subject: Re: one site I found recommended an A/C motor | |
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Author: billvon |
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Date Posted: 09:21:25 05/13/08 Tue In reply to: sci guy 's message, "one site I found recommended an A/C motor" on 13:05:31 04/30/08 Wed >Apparently, the A/C motor is better for regenerative >braking. AC, brushless DC or brushed DC can all be used for regen; it all depends on the controller. Brushless DC probably has the best controllers nowadays for regen. >Why not use FWD electric lock-out clutches to reduce >motor drag? That would work, but would add unsprung weight and would be mechanically complex. The cool thing about a hub motor is that most of the motor can spin, so there's only one bearing. A clutch would add a second set of bearings so that the wheel could spin independently of the motor housing. >I'll probably still go gel pack tho, as I'm told that i >will save a fair bit on weight. "Gel" batteries are lead-acid with gelled electrolyte. If you want to save weight you probably want to go AGM (absorbed glass mat) VRLA's (valve regulated lead acid.) In an AGM all the electrolyte is held in a cottony "spun glass" (think fiberglass insulation) and thus has a small amount of liquid compared to a flooded cell. If you wait a little longer, A123 may have some LiFePO4 cells pretty soon. Right now you can get decent lithium polymers from Batteryspace but they are pricey. [ Next Thread | Previous Thread | Next Message | Previous Message ] |