97mm Flywheel Clones + Custom gt4020 (50mm) 85kv

Lightweight / Folding / Portable EVs - seats optional
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saul   1 W

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97mm Flywheel Clones + Custom gt4020 (50mm) 85kv

Post by saul » Feb 20 2016 2:50am

Finally piecing together a build, heres what I have...

Parts:
97mm Flywheel Clones
Torqueboard's Bolt on v1 motor mount
36" DropTrough Bamboo/Maple
Caliber II 50 10" trucks
16t/ 36t htd 5mm x 9mm (upgrading to 12 or 15 i think)

Electric:
85kv Emax gt4020
http://www.emaxmodel.com/brushless-motor/gt4020.html
https://endless-sphere.com/forums/viewt ... 31&t=71188
VESC v4.10 (Enertion)
2s x 6s multistar 10c 5.2ah (Swapable)
Torqueboard's Mini rc tx/rc (for now)

When I have time to make a prettier version of this
https://41.media.tumblr.com/6a3aee4aef0 ... o1_340.jpg
and test out this.
https://endless-sphere.com/forums/viewt ... 35&t=73812

Photos:
Board
Image

Lights
Image

Motor
Image

Single Side?
Image

Or Balanced?
Image

3d printed tpe Flexible (and Strong)
First try
Image

New Version
Image

Image


to be continued... :pancake:
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Builds:
97mm Fly wheels + tiny 85kv + 12s Vesc
https://endless-sphere.com/forums/viewt ... 35&t=76450

more to come...

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Vanarian   10 kW

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Re: 97mm Flywheel Clones + Custom gt4020 (50mm) 85kv

Post by Vanarian » Feb 20 2016 7:02am

So cool!

I can't help but feel proud see one of "my" motors on your build! Please shoot a video when you have time :wink:
-+AT-One project : electric inline skates - no remote, hub motors, one frame for various wheel sizes & quasi-universal boot mount

Rollo Ergo Sum!

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Re: 97mm Flywheel Clones + Custom gt4020 (50mm) 85kv

Post by torqueboards » Feb 20 2016 1:04pm

Let us know how that motor works out. I'm somewhat interested.
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saul   1 W

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Re: 97mm Flywheel Clones + Custom gt4020 (50mm) 85kv

Post by saul » Feb 20 2016 5:28pm

Vanarian wrote:So cool!

I can't help but feel proud see one of "my" motors on your build! Please shoot a video when you have time :wink:

I'll post a video later so you can see you motor in action, at least for a test.

torqueboards wrote:Let us know how that motor works out. I'm somewhat interested.
I bet i'd have your attention if it were a dual or quad drive! 8)
but thats for later.

Seems like the trend has been higher voltage and lower kv motors, with vesc gaining support i think this will be a good test of the lower limit to kv, at least for belt drive.
Builds:
97mm Fly wheels + tiny 85kv + 12s Vesc
https://endless-sphere.com/forums/viewt ... 35&t=76450

more to come...

torqueboards   100 MW

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Re: 97mm Flywheel Clones + Custom gt4020 (50mm) 85kv

Post by torqueboards » Feb 20 2016 9:33pm

I like the higher kv and I'm interested to see what you say about the Lower kv.

I think lower kv is like stuck on 1st gear.

You won't be able to climb much of any Hills if your using gearing on top of it.
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WeeChumlee   1 kW

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Re: 97mm Flywheel Clones + Custom gt4020 (50mm) 85kv

Post by WeeChumlee » Feb 22 2016 5:30am

Hi
Wow, that is a low KV motor. Not seen one go as low as 85KV.
I am by no means an advocate for high speeds and prefer torque to speed so also very interested in how this performs.
The 4020 surely is not really the motor dimensions? What are the real dimension? I do not seem to be able to find a data sheet or specs of the 85KV version.
Doing the calculations I come up with a theoretical speed of about 18mph. Real speed will be less. Like I said, no speed demon myself and if that is what you want then great.

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Vanarian   10 kW

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Re: 97mm Flywheel Clones + Custom gt4020 (50mm) 85kv

Post by Vanarian » Feb 22 2016 1:21pm

Actually you can't find a datasheet as this is a bit custom version which not yet on the market, but once his (and my units) have proven to be powerful it will become available.

E-Max gives strange names to their model, actually this is a narrow 50mm motor. Total width is 30-35mm.

Speed with this much gear reduction at 6S should effectively remain under 20mph, but I personally plan on using mines with minimum 37V plus hub hence the choice of Kv. That's what I'd recommend but you never know.

Hopefully Saul will like them! :P
-+AT-One project : electric inline skates - no remote, hub motors, one frame for various wheel sizes & quasi-universal boot mount

Rollo Ergo Sum!

saul   1 W

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Re: 97mm Flywheel Clones + Custom gt4020 (50mm) 85kv

Post by saul » Feb 22 2016 6:31pm

WeeChumlee wrote:Hi
Wow, that is a low KV motor. Not seen one go as low as 85KV.
I am by no means an advocate for high speeds and prefer torque to speed so also very interested in how this performs.
The 4020 surely is not really the motor dimensions? What are the real dimension? I do not seem to be able to find a data sheet or specs of the 85KV version.
Doing the calculations I come up with a theoretical speed of about 18mph. Real speed will be less. Like I said, no speed demon myself and if that is what you want then great.

I think 4020 is the stator size, the actual can is 50 x 46mm (d x l),

I'm not looking for crazy speed either, there are hills that can do that already, just want something that can hopefully get up some of them.
I figure it will get about 16mph and then if i really want speed i can get a 32t hub gear to get around 22mph...

I want to go out and do a test ride already but I'm having some strange "cogging" issues... Hopefully someone can help me figure it out on the vesc fourm.
You can see the issue around 25s
https://drive.google.com/file/d/0B4_1KK ... sp=sharing



Printed the battery Box. went overboard but it will give some very good protection.

Image

Image

Did not plan on so much white, hope it can stay cleanish.
Image
Builds:
97mm Fly wheels + tiny 85kv + 12s Vesc
https://endless-sphere.com/forums/viewt ... 35&t=76450

more to come...

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Vanarian   10 kW

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Re: 97mm Flywheel Clones + Custom gt4020 (50mm) 85kv

Post by Vanarian » Feb 22 2016 8:57pm

Thanks for the video. Ok I didn't know this was the issue, it is not voltage related! Definitely needs a tweaking in VESC settings...
-+AT-One project : electric inline skates - no remote, hub motors, one frame for various wheel sizes & quasi-universal boot mount

Rollo Ergo Sum!

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maxchilton   10 W

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Re: 97mm Flywheel Clones + Custom gt4020 (50mm) 85kv

Post by maxchilton » Feb 23 2016 4:28pm

my guess is the motor doesn't like the 50+volts you're running through it and you'll probably smoke it the second you put any load on it.
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das it mane.

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Vanarian   10 kW

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Re: 97mm Flywheel Clones + Custom gt4020 (50mm) 85kv

Post by Vanarian » Feb 23 2016 4:36pm

maxchilton wrote:my guess is the motor doesn't like the 50+volts you're running through it and you'll probably smoke it the second you put any load on it.
What do you mean? The OP is running 6S = 22.2/25.2V. That is the factory testing of GT4020 motors from E-Max so that's not the origin of his cogging issues at 0 load.
-+AT-One project : electric inline skates - no remote, hub motors, one frame for various wheel sizes & quasi-universal boot mount

Rollo Ergo Sum!

saul   1 W

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Location: Los Angeles, CA

Re: 97mm Flywheel Clones + Custom gt4020 (50mm) 85kv

Post by saul » Feb 23 2016 7:35pm

maxchilton wrote:my guess is the motor doesn't like the 50+volts you're running through it and you'll probably smoke it the second you put any load on it.
its only on 6s right now, and it was a setting issue because of the low kv.
even still 12s is only 50v max, and i probably will only charge to 4.1 so 49ish.

anyways its not the volts that smoke a motor, its the amps. :twisted:
Builds:
97mm Fly wheels + tiny 85kv + 12s Vesc
https://endless-sphere.com/forums/viewt ... 35&t=76450

more to come...

WeeChumlee   1 kW

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Re: 97mm Flywheel Clones + Custom gt4020 (50mm) 85kv

Post by WeeChumlee » Feb 24 2016 6:03am

Sorry, not quite following here.
I took it you were using the two 6S batteries to make a 12S system, I calculated the speed on that.
You say though that you are using a 6S system. From that though I calculate - using data given in first post - a theoretical speed of only 10mph.
I may not be a speed demon but that is a bit low. (IMHO)
Can't see that catching on, though if you are happy with it then that is the only important thing.

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Re: 97mm Flywheel Clones + Custom gt4020 (50mm) 85kv

Post by torqueboards » Feb 24 2016 12:44pm

Not including losses... so you'll actually only get about 7-8mph.
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saul   1 W

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Re: 97mm Flywheel Clones + Custom gt4020 (50mm) 85kv

Post by saul » Feb 24 2016 9:52pm

It is going to be 12s, just configuring the vesc on 6s because I read somewhere on here that bldc tool doesn't like high voltage.

torqueboards wrote:Not including losses... so you'll actually only get about 7-8mph.
This is pretty much a normal cruising speed on a kick board, wouldn't mind this for a long flat ride, would probably last forever...
or for letting friends try it out, i feel like most will underestimate the kick on 12s...

Anyways, nearly have the settings worked out. will hopefully have some time to do the final touches and go for a test ride but lots of assignments to do first...

@torqueboards is there a trick to getting your wheel pulley centered? the last bit of wobble keeps making the belt want to slide off...
Builds:
97mm Fly wheels + tiny 85kv + 12s Vesc
https://endless-sphere.com/forums/viewt ... 35&t=76450

more to come...

NyOliver   10 W

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Re: 97mm Flywheel Clones + Custom gt4020 (50mm) 85kv

Post by NyOliver » Mar 04 2016 1:19am

12s with more batteries? Have you calculated the amp draw, because you really want to keep those batteries at 3c, hitting 10c is going to shorten the range, and life of the battery.
saul wrote:It is going to be 12s, just configuring the vesc on 6s because I read somewhere on here that bldc tool doesn't like high voltage.

torqueboards wrote:Not including losses... so you'll actually only get about 7-8mph.
This is pretty much a normal cruising speed on a kick board, wouldn't mind this for a long flat ride, would probably last forever...
or for letting friends try it out, i feel like most will underestimate the kick on 12s...

Anyways, nearly have the settings worked out. will hopefully have some time to do the final touches and go for a test ride but lots of assignments to do first...

@torqueboards is there a trick to getting your wheel pulley centered? the last bit of wobble keeps making the belt want to slide off...

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Re: 97mm Flywheel Clones + Custom gt4020 (50mm) 85kv

Post by torqueboards » Mar 04 2016 1:44am

@Saul - If your belt is sliding off it's because your motor pulley is not aligned properly. That's usually my issue.
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saul   1 W

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Re: 97mm Flywheel Clones + Custom gt4020 (50mm) 85kv

Post by saul » Mar 04 2016 3:54am

torqueboards wrote:@Saul - If your belt is sliding off it's because your motor pulley is not aligned properly. That's usually my issue.

thanks, I was able to see the wobble and get it lined up straight enough after a few tries.. i think i'm going to try a 3d printed spacer/insert to help set it in place easier and with more surface to hold.
Builds:
97mm Fly wheels + tiny 85kv + 12s Vesc
https://endless-sphere.com/forums/viewt ... 35&t=76450

more to come...

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