Two controllers and motors, one pas sensor?

[iangreenhalgh]

Hi folks

I'm building a dual hub motor bike. It's running on one motor a the moment, not connected the second one yet but it's installed.

I know how to wire up both controllers to one throttle, but I'm wondering about the PAS sensor. Obviously, the way it is setup now, with one motor, the PAS sensor is plugged into that motor' controller.

When I connect the second motor and am running both motors, do I have to also have a PAS signal going to the second controller? i.e. splice the signal wire so it goes to both controllers, as done with the throttle?

The PAS sensor limits the top speed to the road legal 15.5mph here in the UK, but I ride mainly off road on paths and unincorporated roads, so I'd like the option to go a bit faster sometimes. Would fitting a switch to the PAS wires between sensor and controller allow me to turn off PAS and de-limit the speed?

 

[motomech]

The PAS sensor is a Hall, the same as a throttle.
It's been years, but I originally split the 5V throttle signal to go to two controllers and to make it work halfway decent, I had to keep the controllers close together w/ a common ground. Even then, the throttle response didn't "feel" smooth. There was interferance between the two controllers.
The next set-up was two throttles, a left-side half-twist next g to a a thumb.

This works well, one natural motion, but even more importantly, I can run the motors independent. The fact is, I rarely need more than the rear motor and only use the frt. to blast across the street or make a top speed run.
I can save battery capacity that way.
Since I have added PAS, I mostly just use the PAS for rear motor and the thumb for the frt. Too simple.
While I have read of folks being happy running two controllers off one signal, I think the right way is to electronically replicate the original signal into two via a Cycle Analyst(or something like it). Then I believe, torque differiental can be dialed in. With motor systems running more than, say 800 watts, the rear wheel tends to unload the frt., resulting in unwanted wheel spin.

So you are saying that your controller limits PAS to 15 mph without a means to defeat? I would replace the controller f I wanted more speed.

 

[iangreenhalgh]

I'm not sure about the controller, as far as I know, if the pas is plugged in, it limits the speed, if it isn't plugged in, no limit.

 

[cal3thousand]

There's no need to splice wires to run 2 sensors. Just use 1 magnet ring and 2 sensors placed next to each other, each going to it's own controller. Splicing starts to mix the 2 circuits of the different controllers and that is not good.

 

[iangreenhalgh]

Cheers, I'll fit both, as you suggest.