dual motor, one controller?

[jimt0r]

does that configuration work or will I need 2 controllers

 

after that is ther any problems with splitting the throttle signal?

jimt0r

[Leslie]

Sorry no,

You need one controller per wheel as the phase position will vary from motor to motor, and the current draw from two motors is more than one pack or controller can usually handle.

If you could join two hubs together in identical positions and lace them onto one rim you would have a starting point. But! 

The MP has a controller in each hub by default.  So if you purchase two Magic pies you will already have two controllers. 

[jimt0r]

ok that soves the 1st problem, and any trouble splitting the siganl wires from the throttle or do we solder on a y adaptor?

[Leslie]

ok that soves the 1st problem, and any trouble splitting the siganl wires from the throttle or do we solder on a y adaptor?

Only a small problem.  The Pies may be out of balance making one do more work than the other.  Use your program cable to set the MP's even.

The throttle signal to both controller needs a voltage to be above .6v, .8 is normal with no twist, to not induce throttle failure mode in both controllers so watch what the load the 2 controllers may place onto the throttle, as this can bring down the no twist minimum voltage down a few points.

The throttle hall is rated at 7ma but I think from memory it can take 20ma load.

If you have problems here with the throttle load do try 2 throttles on each controller, a thumb throttle on the left hand and a twist throttle on the right.

I have built a throttle  current amplifier as it seems, good for 100ma, when I was building a hall sensor tester.  It never worked on hall senors in the wheel becuase I built with the throttle.  Doh!

Give the split a try and if it isnt working well for you I can maybe guide you into how to do it.

You will need a multimeter and a little understanding how to do current tests and voltage tests if this splitting is not up to scratch.

[MonkeyMagic]

Hey good point Les - just a thought; My assumption of the throttle signal was that the controller read this as a voltage reference. So having 2 controllers connected to the same throttle signal would not matter.

As long as they are operating from the same battery source (well the same GND), both controllers would see the same voltage. The 5v output of one of the controllers would be more than sufficient to give 2 voltage reference signals should this be the case.

Hmmm I can possibly test this if I rig up both of my cast wheels together... I'll scrounge around for an old frame I can cut the back off to make a wheel holder... I sense danger lol

[vapid2323]

FYI I have already done this with two pies you just split the cable it's worked fine for me, done about 50 miles so far

[jimt0r]

cheers mate