True, you could manage with less power. For the same power it would need to be bigger, though.Whiplash wrote:Driving through the gears would make you actually need LESS power?
umejopa wrote:It seems to be a good drive.
Have any one ask for price of a crankmotor ?
Need some welding to the frame but a steel frame that not so hard.
Miles wrote:True, you could manage with less power. For the same power it would need to be bigger, though.Whiplash wrote:Driving through the gears would make you actually need LESS power?
* No-Load Speed 155Rpm
* No-Load Current 0.8A
* Hall Sensor Yes
* Efficiency 78%
* Normal Voltage 36V
* Phase Angle 120°
* Power 180Watts
* Rated Current 6.4A
* Rated Speed 135Rpm
* Rated Torque 12.7N.m
* Weight 3Kg
Well, as we said, if output speed is constrained to a reasonable cadence, size and weight will be directly proportional to power required, for a given design (internal reduction ratio etc.).Whiplash wrote:I just don't get the idea that you need to make a unit only handle stupid low power like that.......
1. Crank Shaft Electric Motor with Own Exclusive Patent
2. More Beautiful, more logical, more energy-saving
3. Hight Efficlency In power Conversion.(Reduce Mechanical Loss), Highly Efficient In-Line Drive.
4. Model: BFLEM36-001
5. Rated Voltage: DC 36V
6. Rated Power: 150-250W
7. Rated Efficiency: 80%
8. Our motor has a wide range of gear ratio due to using planetary gear and can be adjusted according to your demands.
9. Using Dual-rachet clutch
10. Electric power supply and manual labor are totally separated without interfering with each other, which makes the structure of electric motor more compact
11. High quality and most competitive price, and providing high-quality after services
12. DC Brushless
It is a 350-400W very strong bottom brackets engine (Bofeili) and can be operated with both 36 and 48V.
The controller is a 15A.
Thereby is 28 mph loosely possible (with 36V) and 17% hill very easy to drive .
..and you can read and see the building process in german pedelec-forum (http://www.pedelecforum.de/forum/showth ... -Selbstbau).
You can check it with the rated torque figure.... If anything, they've inflated the power....Hillhater wrote:Probably just another case of quoting figures to suit the European laws !
Whiplash wrote:Yes, but couldn't these companies that have the resources just build a unit with some headroom?