Drained and replaced transmission & hydraulics oil and filters. Rebuilt the steering column and rack. Repaired rust in guards. A lick of paint and the rear of the tractor is now looking sweet!
Motors, controllers, test batteries and a few other parts recently arrived. So, I could then mock up the electrics layout:
My father-in-law is a design engineer, so he's now designed mounting brackets for the motors and shaft bearings, and we've confirmed timing belt pulley and belt sizes. So, with those all on order it's more waiting now for a while 😀. But, it's all starting to come together...
However, I bet you are interested in what motors and controllers I've gone with?
I'm hoping I've done my sums right on the motors, at least for my needs anyway. We only have a small (12 acre), flat lifestyle block of land, so I don't need the tractor to do anything too meaty. Mainly towing a small car trailer around with hay on it and occasionally topping (small 1.5m slasher mower) some paddocks (takes about 20mins to top a paddock with my current Fergie 135 tractor).
I've also bought these cheaper motors and controllers to start with, in case I have got it wrong. If I have to 'upgrade' to bigger - better motor(s) later, I'm ok with that. I've also gone with two different types of motors and controllers too, just to make the project even more interesting 😂. The motors and controllers details are as follows:
For the transmission: a
QS-Motor QS-180 motor (with encoder, not hall sensors) with
Far Driver ND72850B (encoder version) controller. Hope we get the 8kW rated (@4200rpm) & 15kW peak (@6000rpm) and 18.2Nm of rated torque & 65Nm of peak torque (@1895rpm) => Using the planned 2.6:1 reduction (T10 timing pulley with 18 teeth on the motor and a pulley with 48teeth on the transmission shaft) the peak torque 1895 RPM equates to 728 shaft rpm, which was pretty much the idle speed of the diesel engine.
For the PTO: a
Golden Motor - HPM-10kW motor with Golden Motor VEC500 controller. Should give 10kW rated (@3700rpm) & 20kW peak (5000rpm) and 26Nm rated & 85Nm peak torque (again with 2.6:1 reduction - 24 teeth pulley for motor and 60 teeth pulley for PTO shaft - it will increase the torque and power to the PTO shaft). The VEC500 has cruise control, which I hope will be good for holding PTO speed too.
Both motors running at peak power/torque is around 400A using 48V, so hopefully it's all enough. For comparison the David Brown 880 ICE had peak 47Hp (35kW), when new, and 120 lb ft (160Nm) of torque. So, with the 2.6:1 reduction and split load across the motors, I'm hoping we're within the realms of usability.
Next post should see a few more things coming together...
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