A member asked me to help him put together a 2WD bike. This gave me an excuse to disassemble two 1/2 twist throttles and build them into one.
These particular throttles are from Ebikes.ca. There are many types of hall throttle
- this particular model is very nice. The hall slides right out and there is room to mount a second hall in tandem.
* In the minimum throttle
position the magnet actually rotates a little too far. This actually raises the minimum throttle
voltage. Glue in a small spacer (small zip tie?) to offset the minimum voltage. (Picture 007)
* The hall sensors behave the same upside down - mount the second one upside down to make room for the wires.
* Mounting the second hall in tandem will result in a slightly lower reading. The closer you get the hall the smaller the delta. This delta can be corrected with a small inline resistor or left. I am going to leave the delta to bias power toward the rear wheel. At time zero - 2WD is really just RWD - the front wheel is totally unloaded - so applying equal power will result in nothing but lost traction. At WOT the the power will be equal. At cruising speeds the offset will help (I hope) to avoid interactions between the two motors. Most of the load should be on the rear motor. At any given time the rear motor will carry more load than the front (as it should, unless you like loss of traction on the front wheel)
* Grind away some of the hall mount to get the second hall closer
* Move the strain relief zips ties around for a better fit
Bias: 5% toward the rear
Credit to the member who suggested this modification earlier.
There - I have laid another egg. This offsets the fact that I tend to ramble OT.
Those that got bored and stopped following miss out.