Hugh-Jassman
1 kW
- Joined
- Jun 20, 2015
- Messages
- 407
I think someone should do a comparison test between a mid-drive and a hub motor with 10 to 12 turn winding with or without gears. How much energy would it actualuy use in a given hill climbing compairison. Same total combined weight, speed and steepness of grade? With the price of batteries being so high I think this would be a good thing to know.
I think the only way to build a gearless power system with hub motors would be to use two; the front wheel would need a 5 turn winding and the rear a 12 turn winding, then literaly switch between them. This would be good for hauling a total combined weight of 500 to 600lbs on the same steep hills. But if there is a weight limit of 200lbs on each hubmotor I would need three wheels.
After setting up my CycleAnalyst I drove my bike with Cyclone3000 up the short hill up to my house with two arm loads of fire wood in my trailer [about 450-475lbs total combined weight] while in the high gear [11:1 ratio] drawing about 1400watts then in the low gear drawing only about 600watts [20:1 ratio]. For most hills I use a 16:1 ratio making it 3 seperate gears that I use. [My drive wheel's tire is 23” diameter. The ratios include the 6:1 planetary gear reduction in the motor.]
No-one ever says anything about how little power is needed. I would really like to hear from someone with a 5:1 geared hubmotor with at least 10 turns. A voltage multiplier is just a way make it possible to burn more amps.
I have been using around 37 to 43 Wh per mile depending on whether I climb a hill or not. Averaging 10.2 mph. I must recharge for 45minutes at the food-co-op before driving home. Because my 52v battery is only 13.5 amp hours that cuts off at 39 volts, and I charge to only 90% before leaving on my trip to town. Aprox. 10 miles round trip.
The Cyclone can out put 3000w only at 72volts and I don't want to get anywhere near that.
Does any one know if the Cyclone Mini is a faster RPM motor, thereby needing the larger 9.55 to 1 gear reduction?? or did they do that to make it more street leagal.