My1020 / Kunray / YaLU 1000 - 2000W motor ?

Electric Motors and Controllers
coleasterling   100 W

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Joined: Sep 21 2010 3:37am

Re: My1020 / Kunray / YaLU 1000 - 2000W motor ?

Post by coleasterling » Aug 08 2019 5:32pm

Back to top for this one. I pulled apart a motor and measured lams...Not good at 0.5mm, sadly. I was spinning it today at no load and noticed some significant heating despite only 4A no load at 7krpm. I did not measure the rate of heating at, say, the 4600rpm it is rated for. I had intended to reterminate in delta, but this may keep me from it and push me onto finding a new motor. Oh well.

PKGB   1 mW

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Re: My1020 / Kunray / YaLU 1000 - 2000W motor ?

Post by PKGB » Dec 21 2019 1:25am

I'm converting 4 go-karts with MY1020 motors. I have 2 2000w versions and a new 3000w version running 72v and a 25-50 amp controller that was sold with the motor. I'm going to use 60v batteries for the others. The performance is a lot better than I expected from such a cheap set up, so I'm going to see how much I can push them. I was just going to use the karts as drift-karts, but now I'm thinking about going to the track. Go-kart races are normally very short so they don't have to run too long - 4 or 5 minutes at a time. With a 15T drive sprocket and 66T rear sprocket it gets up to 65 km/h pretty quickly with only the cheap 25-50 amp controller. With a 20T drive sprocket (on the way) it should get close to 90 km/h. I'm going to try their 80 amp controller as that is also dirt cheap. I've got an SVMC72150 spare at the moment so I'm going to try that. I don't want to over rev the motor, I would rather use gearing to reach the desired top speed and then throw amps at it. I'm drilling bigger holes in the end plates, and I'd like to try some cooling fins.
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PKGB   1 mW

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Re: My1020 / Kunray / YaLU 1000 - 2000W motor ?

Post by PKGB » Jan 13 2020 12:32am

I've wired up my Sabvoton SVMC72150 no problem to one of my karts. I've only done a quick test but the motor temp hasn't gone over 50c while running. It goes up to about 60c after stopping which suggests the motor cools quite effectively while I'm doing 65 km/h at full throttle. I was putting 300 phase amps through it at 72v which was a bit much for my battery but the motor seemed fine. And I've just been invited to take a kart to a proper Kart track early next month so I'll be able to do some real testing.

ShadowNightmares   1 µW

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Re: My1020 / Kunray / YaLU 1000 - 2000W motor ?

Post by ShadowNightmares » Jan 16 2020 9:59am

Hey, PKGB, your kart conversion is really interesting, please keep us updated with your project, and photos/videos if you can

PKGB   1 mW

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Re: My1020 / Kunray / YaLU 1000 - 2000W motor ?

Post by PKGB » Jan 17 2020 8:57pm

I'm making my Arrow AX6 #16 my track kart, with the Sabvoton SVMC72150. I'm getting some custom sprockets made to increase top speed. Blasting up and down the street isn't stressing the motor at all. Only 3 weeks till I can do some track testing!
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MorbidlyObeseKoala   10 mW

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Re: My1020 / Kunray / YaLU 1000 - 2000W motor ?

Post by MorbidlyObeseKoala » Jan 21 2020 1:31pm

Did you order that battery or make it yourself?

PKGB   1 mW

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Joined: Nov 16 2015 3:52am

Re: My1020 / Kunray / YaLU 1000 - 2000W motor ?

Post by PKGB » Jan 21 2020 4:52pm

That's an EM3EV battery, 20S10P of 30Q cells. I'm about to receive a 60v 20ah battery from UPP that I'm going to try.


markz   100 GW

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Location: Alberta Canada

Re: My1020 / Kunray / YaLU 1000 - 2000W motor ?

Post by markz » Feb 02 2020 5:04pm

What is the highest wattage MY Unite motor available?

Here is a "60V 2000W"
https://electricscooterparts.com/motors60volt.html
Weight 10 lbs

PKGB   1 mW

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Re: My1020 / Kunray / YaLU 1000 - 2000W motor ?

Post by PKGB » Feb 02 2020 5:11pm

They've released a 72v 3000w model. https://www.aliexpress.com/item/3286274 ... 4c4dXETeam

PKGB   1 mW

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Joined: Nov 16 2015 3:52am

Re: My1020 / Kunray / YaLU 1000 - 2000W motor ?

Post by PKGB » Feb 05 2020 8:29pm

I've managed to cook one of the motors. I had been using a 15T drive sprocket as that is the largest available for the MY1020. I got a custom 25T sprocket made to try and improve top speed. I got a slight increase in top speed but it didn't take long before the motor temp got over 80c and started smoking and smelling really bad. The motor still works fine, it just doesn't go so fast anymore.

So I'm going to take Kart #8 to Taumarunui Go Kart Track this weekend with the Vintage Kart Club. I've put my 72v battery into this kart with the 80amp controller, and the performance is awesome. 15T drive sprocket and 68T rear sprocket. Acceleration is fantastic all the way through the range with a top speed of 75 km/h. Can't wait for this weekend!


PKGB   1 mW

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Re: My1020 / Kunray / YaLU 1000 - 2000W motor ?

Post by PKGB » Feb 06 2020 7:28pm

PKGB wrote:
Feb 05 2020 8:29pm
I've managed to cook one of the motors. I had been using a 15T drive sprocket as that is the largest available for the MY1020. I got a custom 25T sprocket made to try and improve top speed. I got a slight increase in top speed but it didn't take long before the motor temp got over 80c and started smoking and smelling really bad. The motor still works fine, it just doesn't go so fast anymore.
I may have been using the front nose cone on the kart during that test, and I've just realised how much that would deflect air around the kart instead of having a clear run to the motor. The nose cone is the same height as the motor so that could have a big effect on cooling. I need a wind tunnel...

PKGB   1 mW

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Re: My1020 / Kunray / YaLU 1000 - 2000W motor ?

Post by PKGB » Feb 11 2020 1:24am

Had a fantastic day at Taumarunui Go Kart Track. My kart was about 3 or 4 seconds a lap slower than the 2-stroke karts, but for such a cheap system it was a lot closer than I expected.

I had to keep an eye on the motor temperature as it would keep climbing, although I could get quite a few laps in on each run. I kept the motor temp below 70c on each run, and the motor seems fine. I had previously got the motor on #16 up to 85c and it let out lots of its magic smoke (and smell), so for now I'll stick to 70c as an upper limit. I will now do some mods to improve cooling.

My 72v 30ah battery lasted well, plenty long enough to do enough laps for a race day.

As with most of my projects I started with modest intentions to have a bit of fun, and now I'm like - I NEED MORE POWER! Challenge accepted.

https://www.facebook.com/raetihichopper ... KAdsSoHH4Q

PKGB   1 mW

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Re: My1020 / Kunray / YaLU 1000 - 2000W motor ?

Post by PKGB » Feb 14 2020 8:35pm

Rare, medium or well done?

The motor on the left is the one that heated up to 85c and smoked and stank. It still works but has lost a lot of power. The middle motor is the one I used at the kart track at the weekend, with a max temp of 72c. It has very minor discolouration and performance seems unaffected. The motor on the right is unused.
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