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The motor we bought off e-bay arrived today. We can start thinking about mounting. I'm impressed with how small it is, but we're going to have to think about heat. Maybe some fins.
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| 750 Watts. Plenty of power |
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| 20 Amps peak load (at stall speed) and 2600 rpm @ 36 volts. since this has plenty of power, we might want to look into running this at 24 volts. At the moment, our plan is to reduce the rpm to the upper end of what's considered a decent cadence via some form of reduction. 1:20 final ratio would get us real close. The thought is that under load, we'd get some decent torque matched to a comfortable cadence. |
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| I started to dig into my junk drawers to see what we might use - some nice belts. |
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| A sprag clutch - a kind of roller bearing that spins in one direction but locks in the other. It seems like a perfect fit on the motor shaft but it's unlikely that it will be mounted directly. Most likely a spud shaft if there's not too much overhang or a second reduction. The reason for including a sprag clutch is to disengage the crank from the motor when the speed of the crank exceeds the output of the motor. Without it, the motor would be turned into a generator causing extra work for the cyclist. |
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| A stoker crank for a tandem. this mounts on the left side of the crank. We plan on running power to here. |
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Hmmm. The width of the spider is conveniently close to the width of the belts. We might be able to use this somehow.
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