Revolt RV-series motor review and comparisons

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ElectricGod   1 GW

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Revolt RV-120-regular motor bracket

Post by ElectricGod » Apr 20 2019 4:16pm

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ElectricGod   1 GW

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Revolt RV-120-regular

Post by ElectricGod » Apr 21 2019 4:01am

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Re: Revolt RV-series motor review and comparisons

Post by ElectricGod » Apr 29 2019 2:47am

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ElectricGod   1 GW

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Revolt RV-120-regular

Post by ElectricGod » Apr 30 2019 3:57am

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larsb   1 MW

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Re: Revolt RV-series motor review and comparisons

Post by larsb » Apr 30 2019 10:13am

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 :D
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ElectricGod   1 GW

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Revolt RV-120-regular rewind

Post by ElectricGod » May 08 2019 2:12pm

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Revolt RV-120-Regular

Post by ElectricGod » May 09 2019 12:16am

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larsb   1 MW

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Re: Revolt RV-series motor review and comparisons

Post by larsb » May 09 2019 6:07am

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.
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fechter   100 GW

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Re: Revolt RV-series motor review and comparisons

Post by fechter » May 09 2019 7:41am

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.
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larsb   1 MW

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Re: Revolt RV-series motor review and comparisons

Post by larsb » May 09 2019 8:18am

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?
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ElectricGod   1 GW

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Re: Revolt RV-series motor review and comparisons

Post by ElectricGod » May 10 2019 12:09am

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larsb   1 MW

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Re: Revolt RV-series motor review and comparisons

Post by larsb » May 10 2019 12:30am

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%
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fechter   100 GW

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Re: Revolt RV-series motor review and comparisons

Post by fechter » May 10 2019 10:28am

ElectricGod wrote:
May 10 2019 12:09am

I was thinking something similar...a DC current through a phase will have a specific magnetic strength based on the number of turns on that tooth. I have a Gauss meter I built out of a linear hall and a volt meter to measure the magnetic strength of neo's. I think I could use that to measure each tooth in phase A. They should all measure the same magnetic strength.
Yes, that should work. Good idea.
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ElectricGod   1 GW

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Revolt RV-120-Regular

Post by ElectricGod » May 26 2019 6:15pm

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ElectricGod   1 GW

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REvolt RV-120-regular

Post by ElectricGod » May 26 2019 6:34pm

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.
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ElectricGod   1 GW

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Revolt RV-120-regular

Post by ElectricGod » May 28 2019 10:53pm

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larsb   1 MW

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Re: Revolt RV-series motor review and comparisons

Post by larsb » May 30 2019 3:36am

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.
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ElectricGod   1 GW

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Re: Revolt RV-120-regular

Post by ElectricGod » Jun 21 2019 2:28am

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Revolt RV-120-regular rewind

Post by ElectricGod » Jun 23 2019 9:29pm

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Re: Revolt RV-series motor review and comparisons

Post by fechter » Jun 25 2019 7:42am

Pretty.

Are you going to varnish the windings?
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ElectricGod   1 GW

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Re: Revolt RV-series motor review and comparisons

Post by ElectricGod » Jun 25 2019 11:11am

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Re: Revolt RV-series motor review and comparisons

Post by fechter » Jun 25 2019 1:58pm

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.
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Re: Revolt RV-120-regular

Post by toolman2 » Jun 26 2019 8:30am

ElectricGod wrote:
Jun 21 2019 2:28am
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.

Image
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.

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ElectricGod   1 GW

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Re: Revolt RV-120-regular

Post by ElectricGod » Jun 26 2019 11:17pm

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Post by ElectricGod » Jul 23 2019 2:52pm

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