Hugh-Jassman
1 kW
- Joined
- Jun 20, 2015
- Messages
- 407
I am trying to engineer a better and sexier version of the Elf car. I asked the Elf car people why they used a hub motor with 1:1 ratio to the rear 20” wheel, and the answer did not make much sense. He said that it was “because they are restricted to one HP.” Yet they claim to be able to climb some incredibly steep hills, with the minimum weight of 150lbs with a driver that may weigh only 100lbs? Maybe 300lbs total combined weight? (So much for the stupid laws that limit the power ratings on the label of a motor). I do not know if they use a geared hub motor, I suspect not, but if they used something like the Crystalyte , it would be more understandable.
I would like to find a way to use gears on one of the Leaf non-hub motors 800w or the 650w. http://www.leafmotor.com/bldc-motor/electric-bldc-motors.html
I was thinking about a Nuvinci but they are expensive and are of dubious performance and weight. Is it possible to apply a two or three speed motorcycle gear box to one of the leaf motors??? But maybe I don't need one?
Actually I may build one of these tilting rear end trike velomobiles and use a jack shaft to gear the motor down to the right speed. But it still maybe desirable to use a gear box. I want to be able to drive a 400lbs (or more) up an 8% grade. (And end up with a top speed of about 19mph (or less) on level ground?). Supposedly it takes 1432 Watts to move 400lbs up an 8% grade at 19mph, before gear losses? http://www.kreuzotter.de/english/espeed.htm
I tried to down load the spec sheets for the Leaf motors and my computer will not open them. I hope some one can show me what the motors are capable of.
I have people trying to tell me that I should just use a 'stoke-monkey' hub motor, mid-drive. What are the pros and cons? Does the lack of gears increase the efficiency more than is lost by having to move slowly (at human cranking speed)? I think the main problem with the stoke monkey may be the weight to efficiency ?....is that it?
I would like to find a way to use gears on one of the Leaf non-hub motors 800w or the 650w. http://www.leafmotor.com/bldc-motor/electric-bldc-motors.html
I was thinking about a Nuvinci but they are expensive and are of dubious performance and weight. Is it possible to apply a two or three speed motorcycle gear box to one of the leaf motors??? But maybe I don't need one?
Actually I may build one of these tilting rear end trike velomobiles and use a jack shaft to gear the motor down to the right speed. But it still maybe desirable to use a gear box. I want to be able to drive a 400lbs (or more) up an 8% grade. (And end up with a top speed of about 19mph (or less) on level ground?). Supposedly it takes 1432 Watts to move 400lbs up an 8% grade at 19mph, before gear losses? http://www.kreuzotter.de/english/espeed.htm
I tried to down load the spec sheets for the Leaf motors and my computer will not open them. I hope some one can show me what the motors are capable of.
I have people trying to tell me that I should just use a 'stoke-monkey' hub motor, mid-drive. What are the pros and cons? Does the lack of gears increase the efficiency more than is lost by having to move slowly (at human cranking speed)? I think the main problem with the stoke monkey may be the weight to efficiency ?....is that it?