Conversion to electric (no kit)
I've got a multispeed bike that I want to convert to a pedal/electric bike. I'm not going to use a hub motor because I want this bike to assist me for climbing hills and that means TORQUE.
I'm thinking of using a brushless motor linked by chain to one of the gears on the back wheel. I'll sacrifice some gears but I'll live with it.
As a motor selection I was looking at this:
BM 3500KV Tuborix 438W
Specification:
rpm/v (kv) : 3500
Suggested Battery : 11.1v Lipo Battery
Load Current (A) : 39.5A
Load Speed (rpm) : 21700
No Load Current : 3.7A
No Load Speed (rpm) : 38700
Recommended ESC : Turborix Advance 40A ESC
Suggested Propellers : APC 5.5 X 4.5"
Weight : ~60g
or this:
Brushless EMGC AX-2212H 3350KV
Rotational Speed 3350 RPM/V
Continuous Current 20A
Max. Current 25A
Input Voltage 8 - 12V
Max. Efficiency 96%
No Load Current 0.7A
Internal Resistance 106mO
Motor Dimensions 28mm x 30.3mm
Shaft Dimensions 2.25 x 14.2mm
Input Battery Types NiCd/ Nimh/ Li-po Battery
Recommend Model Helicopter / Airplane
To pedal when the motor isn't running I'd like to put a freewheel mechanism on the output shaft of the motor. Can I find one of these to buy separately from a new wheel?
For batteries I have a box of 2000mA LiPo cells left over from another project. These should do nicely if I tie more together.
Any advice? Are the motors I've selected good for an e-bike?