Advice on building True PAC

[chooks42]

I have a recumbent, and I want to put a mid motor, NuVinci Hub and some sort of Torque sensor (probably on the crank) on it. Looking at 36/48 v system.

Can anyone give me advice about how to build a PCB that will let the torque sensor 'talk' to the controller. Love to know best places to buy the bits and pieces as well (controller, torque sensor, even motor). I'm new to this, so any help would be appreciated. I have enough electronic skills to build, but not design.

 

[AussieJester]

I believe this sort of system is called pedalic...Bionx sell a pedalic kit
which has sensors on the crank to determine the riders input
and adjusts the motor input accordingly...IIRC...

All the best

KiM

 

[chooks42]

I was hoping to build it without the use of a kit... any clues?

 

[AussieJester]

I was hoping to build it without the use of a kit... any clues?

other than buying the pedalic components from Bionx and adapting it too your
application...nope sorry, not my field of expertise...

KiM

 

[Miles]

http://www.endless-sphere.com/forums/viewtopic.php?f=2&t=22129

 

[jateureka]

Not all pedalec systems use torque sensors.
Do you specifically require a torque sensor or is it just that you don't want to use a throttle on your recumbent?

 

[jateureka]

http://www.ezprobike.com/products/products.php?cID=1
Some use torque sensor via BB and some just use crank rpm sensor

SOme use torque sensor on chain ring
http://www.dhgate.com/torque-sensor-ebike-pars-pedelec-sensor/r-ff8080812d0dad01012d10fbb7ad11ee.html

SOme others use torque sensor on rear frame stays or dropouts

 

[chooks42]

I dont want a throttle system. I would like to build a system with a torque sensor. I'm using a nuVinci hub, so I have to use a mid motor and (im guessing), a bottom bracket torque sensor (as the dropout type sensors would respond to the motors torque, and provide 'feedback' - i think). I'm guessing it is all about the controller. It seems its not too hard to find a torque sensor, but how to find someone who has designed a controller that will take the torque controller info and make it work?

 

[Miles]

I'm guessing it is all about the controller. It seems its not too hard to find a torque sensor, but how to find someone who has designed a controller that will take the torque controller info and make it work?

Indeed....

 

[jateureka]

Yes, that's why you should look at buying a kit (I have seen several hub motors adapted and used as mid drives) OR a sensor and controller that are designed to work together.

Some insight into the Panasonic drive system torque sensor http://www.kalkhoffusa.com/pedal-assisted-bikes.php

 

[jateureka]

This looks like the complete sensor/controller 'kit' http://www.bmsbattery.com/ebike-parts/306-ebike-torque-sensor.html

and looks similar to what emotoev.com use on the majority of their e-bikes http://www.emotoev.com/products/bicycles/mountain/ridge10/