John in Cr wrote:
Has the no load speed changed? If its gone up then the magnets are damaged
I will start checking no load draws. My current no load= 156watts or 3.55 amps at 44 volts
My guess is that a bearing is shot.
I was unable to get the gear off of the chain side to check the right bearing but the left bearing seemed in decent enough shape: no grinds or clicks. Seems to spin along nicely. I will do some research on how to get the freewheel off of the other side and take a look at that one too.
Regarding your motor getting hotter and taking more power--have you checked your brakes for rub, both on that wheel and the other one
Yes, the front wheel spins nicely without any drag but the rear wheel (the hub motor wheel) will not spin for long after spun. I have compltely disengaged the rear brake to rule out brake drag and it does not make a difference in drag. I have put my ear next to the brake pad and I can't hear it dragging when the brake is on (but not engaged). I turned off regen and when riding the bike when I let off the throttle it slows down like a brake is on.
Yes, I think my CA is miscalibrated because earlier it said I was getting 27aH out of my 20aH batteries.
I think I have the CA calibrated correctly now. I followed post where Itchynackers wrote "If one shunt is approximately 4.8mohm, then for a 12 fet with two shunts: Resistance should be about R = 1/(1/4.8 + 1/4. = 2.4mohm"
I changed my CA to these settings and my electricity discharged to ah charged back up match up now. Also my on paper math matches my CA readings (20ah x44v= 880watt hours. Discharging batteries from full charge to empty 880wh consumed in 1hr for 16 miles=55wh/mi)
Again, more details are needed. What are you doing, with what, at what voltage, etc etc etc. You got us not only guessing, but guessing with no info. We have no idea if you are cruising along the flat at 20 mph, or towing a trailer up steep hills.
My commute to work is a 8.7 mile stetch of highway shoulder to a 7.3 mile stetch of dirt trail. Hills are mild but the entire trip climbs in elevation from 4,500 ft to 5,400 ft (900ft total). I am a 215lb rider on a Giant Revel mountain bike. Tire pressure is a touch on the soft side for street and a touch hard for the off-road segment. No trailers pulled, no dumbells strapped to the handlebars.
Lyen 12 fet
44v (12s lipo) setup
26" 1.95 tires
20mph average to work 25mph on return trip
last readings (with CA properly calibrated) on 5/2/12= 50.1 wh/mi to work 38.7 wh/mi back home (10mph tail wind)
Whew, what a mouthful! I appreciate all the comments guys, and I will have some pics up soon