ElectricGod
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Revolt RV-series motor review and comparisons
- Thread starter ElectricGod
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ElectricGod
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ElectricGod
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ElectricGod
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larsb
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More iron:
-higher total flux possible before reaching saturation point of the steel (more torque, if the heating from copper losses allows more current)
-less copper area (higher copper losses)
and vice versa. It's a balance as usual
-higher total flux possible before reaching saturation point of the steel (more torque, if the heating from copper losses allows more current)
-less copper area (higher copper losses)
and vice versa. It's a balance as usual
ElectricGod
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ElectricGod
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larsb
1 MW
nice work, I like the board idea.
There's 0,081*56*20=90mm2 in your slots, i had 150mm2 in my winding on the same stator but then each slot took about 45 minutes to do with thick wire. The disappointing thing for me was that the performance was still not good and the rotor had substantial heating. 60 seconds WOT with no load would heat rotor so that you could warm your hands on it.. Let's hope your efforts are rewarded.
The difference in inductance and resistance between the phases seem to correspond to one turn (23.3*9/10=21,0) if your measurements have that kind of accuracy. 2mohm is very small.
There's 0,081*56*20=90mm2 in your slots, i had 150mm2 in my winding on the same stator but then each slot took about 45 minutes to do with thick wire. The disappointing thing for me was that the performance was still not good and the rotor had substantial heating. 60 seconds WOT with no load would heat rotor so that you could warm your hands on it.. Let's hope your efforts are rewarded.
The difference in inductance and resistance between the phases seem to correspond to one turn (23.3*9/10=21,0) if your measurements have that kind of accuracy. 2mohm is very small.
There should be a more precise way to test whether all the poles have the same number of turns. I've not done it, but seems like you could send an AC signal through the winding and measure the voltage on a separate coil placed next to the end of the pole. Basically make a transformer.
larsb
1 MW
I cut all the coil wires to the same length before the winding i did, i could spot errors easily through that since one turn is something like 10cm of wire.
I guess it's the same here as each phase length was on the board?
I guess it's the same here as each phase length was on the board?
ElectricGod
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larsb
1 MW
It all depends on the kV and current limit, Revolt stated that the phase current should be lower than 200A when i asked about the heating issues i had. Following RI2 and the relative resistance improvement from 28 to 21 mohm that would mean about 230A for you.
It's a bit weird with the scaling of R*I*I as a big improvement on R doesn't give a lot, not more than 15% improvement on current and torque in this case. That is if the steel isn't saturated already at 200A, if it is then it won't even give 15%
It's a bit weird with the scaling of R*I*I as a big improvement on R doesn't give a lot, not more than 15% improvement on current and torque in this case. That is if the steel isn't saturated already at 200A, if it is then it won't even give 15%
ElectricGod said:
Yes, that should work. Good idea.
ElectricGod
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ElectricGod
10 MW
Well color me confused...
I completely unwound phase A. Every tooth had 10 turns on it. i didn't really think I made any mistakes and that's proof.
I completely unwound phase A. Every tooth had 10 turns on it. i didn't really think I made any mistakes and that's proof.
ElectricGod
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larsb
1 MW
4.04lbs is 1832g, my RV120 Stator weighs 1908g (4.21 lbs) and i have a 30g bearing in place.
So weight is 1878g for my laminations and carrier.
So weight is 1878g for my laminations and carrier.
ElectricGod
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ElectricGod
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Pretty.
Are you going to varnish the windings?
Are you going to varnish the windings?
ElectricGod
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I don't think it takes much to keep the wires from moving. It's amazing how much the wires can move, especially when they are small gauge.
ElectricGod said:Too many pots in the fire!
I unwound the stator again and that let me weigh it without bearings...4 pounds.
I rounded some sharp edges where I made the wire transfer slots larger.
And finally I coated the entire bare stator in electrical paint and then baked it at 300F in the oven. I should have done this before I wound it the first time. After baking the paint gets really hard.
Hey EG, nice job on prepping the stator and the rewind.
Question though -what brand etc is the red paint you have used there? looks like a good thick coating for short protection.
Thanks.
ElectricGod
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ElectricGod
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