15 years ago
slightly larger one recently, and wants to add a motor to the smaller
one). The bikes cost almost nothing (garage sale), so I am not afraid
of ruining that bicycle.
The plan is to go with battery power rather than fuel, for the
I had him ride in front of me yesterday, at a pace that he likes, and
found out that his pedals are doing roughly 80 RPM. To that end, I
want to buy a 12 VDC angled gearmotor that makes about that many RPM,
and connect it to the pedal hub. I would obviously remove the pedals.
The angled gearmotor would be on one side, and the battery would be on
For motion control, I want to wire a momentary double pole double
throw on-OFF-on switch. In one ON position the bike would go forward,
and in another position the motor would reverse and actuate the brake
on the rear wheel hub.
For battery, I want to buy a UPS battery of modest size.
I am eyeing a DC motor rated for 24VDC and about 187 RPM. The motor is
1/4 horsepower. I hope that at twice lower voltage, it would make
about twice fewer RPM and a fraction of power. (I would not want the
motor to produce much more power than a child can produce by himself,
for safety reasons).
Would you say that my expectation of what the 24VDC motor would do at
12V, are justified. Thanks