Building e-bike rolling road dyno

[NeilP]

Just been wondering about this recently and then it came up in another threaad about Burties hall timing adjuster board.

I have seen the big drum inertia type dynos, but they do not seem to be able to be 'loaded up' to give a variable but constant load.

Agricultural type dynos, where a hydraulic pump is driven by the tractor PTO allow variable load to be given to the unit under test, how could this be achieved for a bike dyno on a rolling road...Ok, so a pump driven off the spindle off a light weight drum..or fans or electrically.

Just wondered what others had done ...any ideas regarding the mech side, electrical side and the software all welcome.

 

[Jozzer]

I've got one set up to test Agni motor pairs/quads, with a DA board we made in house and some Labview software I've been working on with Methods/Patrick.
Variable or constant loads possible, continuous power testing etc.

I'm sure it could be adapted to work with any kind of motor/controller setup, as long as regen is possible from at least one controller.

I've been thinking about making the project open source, only the amount of time it would take me has stopped me so far (too many projects on the go, and not enough time!). I wonder, how many would actually build one?

Steve

 

[NeilP]

Ideally I would want spmething working on the rolling road principle, so we can drop the back wheel down and spin it up without having to change the config of the bike

What system do you have?

 

[Jozzer]

It's for hubmotors? I guess you'd have to couple a motor to a roller for this to work out properly. An Agni might be a good candidate for this (rather than another of whatever you are testing), since you could gear the roller to suit your fairly fixed speed range.

You would make up a box with roller and motor, hook it up to the pack with a suitably rated Kelly regen controller, fit sensors on both drive and regen systems to get accurate measurments to work out efficiency etc. Strap the bike on the box, hook up battery leads and go for it...
Much of the power gets recycled back to the pack, so it's eco friendly and you get a lot of test time from a small pack.

You get a data log of the tests saved, as well as onscreen dials and gauges. There are also realtime graphing functions and lots of other bells and whistles possible..

Jozz

 

[NeilP]

It's for hubmotors?

Well yes, i was thinking for any bike, no just hub motors