MisterBill2
- Joined Jan 23, 2018
- 18,176
Consider how slowly the motor would be turning. only ten times as fast as your pedaling speed. Now conside how fast DC motors usually turn. Mostly over 1500RPM. So you would be running the motor in a stalled mode, unless it was made for that sort of application. Do some research of DC motors in a catalog and see about the normal operating speeds to deliver the rated power.
To do it that way you could use a DC motor with a gearbox built in. Thhose are quite common and that could provide the speed that you needed, in the range of 100 to 250 rpm. That would come close to your pedaling speed range.
If you put a larger sprocket on the opposite side of the rear hub and a small sprocket on the motor that might work fairly well. You may even find a surplus gear motor at a decent price.
You never mentioned what sort of bike. Ten speed, 15 or 18 speed, or single speed with a coaster brake.. I have seen an electric add-on for a three wheel bike that was awesome.
To do it that way you could use a DC motor with a gearbox built in. Thhose are quite common and that could provide the speed that you needed, in the range of 100 to 250 rpm. That would come close to your pedaling speed range.
If you put a larger sprocket on the opposite side of the rear hub and a small sprocket on the motor that might work fairly well. You may even find a surplus gear motor at a decent price.
You never mentioned what sort of bike. Ten speed, 15 or 18 speed, or single speed with a coaster brake.. I have seen an electric add-on for a three wheel bike that was awesome.