Hey folks.
Did one of you already a hub dyno for tractors? In the end, I have build 2 separated units, where are connected to the tractors rear axle. I have 4 EC per unit, so in total 8 EC (Klam-550). And yes, the 8 eddy currents are needed, as tractor power goes up to 5000hp (Superstock Tractor Pulling).
Speed diffrerence on hub could occur, and should be controlled by controller (the two separated hub's are mechanically not connected- no synchro shaft in between).
Is there a possibility to do something as a "Master" - "Slave" configuration with the DC2 controller, to manage total 8 separate eddycurrent brakes unit (and also read 8 load cell)?
Thanx for some info's. Regards markus
Hi.
From the dyno controller side, the dyno you're describing can be made.
What rotational speeds do you have on the brakes? I guess directly from hub, the speed is quite low. Do you have a gearbox to increase the speed on brakes?
No problem with left - right synchronization. Controller is doing that.
I don't have an option to run multiple controllers on one dyno, but you don't need that to run multiple eddy brakes. The only tricky part is that only 4 load cells per dyno is supported. You can go around that by constructing a frame that will make 2 brakes push on a single load cell. Having 8 pcs of BD3 power supplies for eddy brakes is supported. I hope you have good power grid connection to your building, because at full power you will be using nearly 40kW only for the eddy brakes :). If you really don't want to use one load cell per two brakes, we can work something out with use of spare analog inputs, but 1 cell per two brakes is preferred in this case. Or even one cell per hub (4 brakes) if you don't plan to split them.
Good Morning.
Yes, there is a Gearbox in the driveline, also to support the tractors rear end weight (direct hub mounted, w/o driveshaft). Then there is a Belt drive too, for oscillation damping effect. I will end up with rotational Speed of eddy brake shaft from 1000.....4500rpm. Tractor pullers have wheel speed from 35km/h (app. Hub rpm = 130) at beginners Class (just app 300hp) and goes up to app 160km/h at Pro Level with the described 5000hp (also taken into account, the delivered torque by droping rpm).
If all my calculation is right (and normally they are), 3 eddy per side (6 in total) will fit too. But frame an all the things are designed, to take 4 in total per side. At the beginning, there will be 3 installed. Bit i have to keep in Mind, to manage 4 (if the future bringa even more Power).
Power consumption from public grid is barely a pain in the ass. But we have good connection, an on sunny days no problem, due to PV on roof building. But even with no sun, it will fit (due to the large PV, we anyway have a 300Amps connection).
For the moment, i have planned 1cell per eddy. Also thanx to limited space on each module, i would be better, having individual load cell.
I need to think about first to build like a connection bar to merge the 2 eddys next to each other. But as they have an individual belt drive, i also have to think about unequal positioning. Does not make it easy.
I'm not in hurry with this project, so i just ordered some sample parts to do some testings on desk.
