the motor needs RPM to cool itself (or external fan).I would speculate that the motor controller would overheat and shut itself down long before the forklift motor would be hot at those amperages. I'm interested to hear how your first test went whenever it happens!
Well today the motor was spinning in anger and it can certainly strain the ropes, tomorrow I will have the meters in place so will know what amps its drawing, as for a beast you did say go for a big one, so I did..........the motor needs RPM to cool itself (or external fan).
problem is at low RPM you need lot's of current to make power. high current = high losses = heat.
but 12 inch motor...that's a beast!!
are you measuring motor amps or battery amps?So Yesterday I had a trial run, it performs well draws 52 amps 3.3KW at approx 3mph, the temp of the motor was 72 degrees C at the end of an hour run, controller was 32 degrees.
cooler is better, try the fan. this also depends on how the motor is mounted (free flow of air or restricted)1/ should I fit the 400 amp breaker or leave it at 300 amps?
2/ should I test it without the breaker to see what the motor really does draw at speed?
3/ Is 72 degrees to hot after an hour or is it normal? will running cooler help performance and life of the motor
are you measuring motor amps or battery amps?
did you measure RPM?
dit you measure motor voltage (should be pretty linear to RPM)
it sounds like it's working well! 72 degrees C was measured on the outside or the rotor / stator windings? I bet you could smell the motor
cooler is better, try the fan. this also depends on how the motor is mounted (free flow of air or restricted)
I like to be able to draw full power for a short period, maneuvering (stopping!) needs power. you could make some 'spring return' on the throttle lever so it doesn't stick to full power.
Check the controller specs on continuous power rating.
Thanks for those, great videos, did you ever get out from under that bridge? I had, like you thought of doubling up on motors, it seems from that video they work very well together. We will be taking a video shortly so I will post it for youCool! sounds good
Here's some of my projects:
fun with the water scouts:
Cant fault you, on a number of occasions whilst getting soaked, I have wished for an instant boat shed!Ah yes, but while doing steel-work on the boat, it was nice to be out of the rain...and with hot weather it was also a perfect work location. (only west / east winds could get chilly)
Right everything is back and assembled tacho connected, the motor spins at 933 RPM flat out, my prop is 19 x 10 if I remember right, the motor should spin at 1600 rpm so what do think for a repitch? 19 x 7? or maybe less even. Look forward to hearing your thoughts.Ah yes, but while doing steel-work on the boat, it was nice to be out of the rain...and with hot weather it was also a perfect work location. (only west / east winds could get chilly)