Finalized! - Longboard Alien Drive Systems - single C6374

[666yeti666]

Yesterday I managed to include a USB connector inside the enclosure as well, so it’s more easy to read out the datalogger.
By the way it is the previous version of this device : http://www.eagletreesystems.com/index.php?route=product/category&path=62

It can log voltage, current, power, accumulated current and with external sensors also temperature, rpm etc. Maybe I will add the temperature sensor and connect it to the ESC heatsink, in the future.
Via the pc program you can choose which parameters to show on the display, of which I choose for ; voltage, current, power and accumulated current. The benefit of the display is that I can ride the board until the pack is only for 80% empty which really extends the battery life ! (lipo’s don't like to be fully discharged…)
Furthermore on the bottom of the enclosure I added a self-adhesive foamlayer to protect from vibrations. For the antispark resistor I used a 6.8 Ohm 5Watt resistor (which I still have to finalize…)

My first remote control is a Spektrum dx3, which is fine for first riding attempts, but since it is so big I want to have a small one. I prefer the Quanum 2.4GHz before the Flysky GT2B but I will follow this thread to see if it works out well in practice : http://endless-sphere.com/forums/viewtopic.php?f=35&t=57180

 

[666yeti666]

So I finally found the time to finish the board !

Test fitted the small box and the battery holder by means of 2 sheets of white paper. Marked the points for the screwz and used 2.5mm drill for the holes (applied a small piece of tape on the drill to prevent too deep drilling…).
Glued the foam to the battery holder and used a braided sleeve around the motorcables.

Then initialized the endpoints of the transmitter into the ESC and changed some settings of the ESC.

Finally got it to work and let the motor spin for some rounds !
It runs very smoothly and has lots of power. Due to the rain I had to test it in house … by sitting on the board and applied some throttle boosts …. Wow, this thing is powerfull !!!

http://youtu.be/VQyPbUSMUt4

The total weight including the 6s 5000mAh lipo is 6.72kg of which I don’t know if it is low, high or average …

Can’t wait to test it outside, hopefully the weather is good to me….

Regards
Sebastien


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[beetbocks]

ooh- i bet you dying to ride it- or have you yet?

 

[666yeti666]

indeed I am, but the weather's too bad to go out (though not as bad at your side ....)

 

[666yeti666]

I just wanted to change the brake settings of the ESC when I noticed that the motorwires had shortened ????
Removing the braided sleeve indeed showed that the yellow and black wires were significantly shorter, WTF ????? A closer look showed what happened; the stator with the windings on it, had shifted/rotated on the red aluminium mounting, and pulled the wires into the housing !!! Oh man, and I didn't even drive this thing outside

Removed the rotor and tried to twist is back by hand .... impossible ... no movement.... damn ....

I have never had something like this before on any brushless motor.

Ok, well, just sent an email to the shop (giantshark uk) and let's see how well their support is...
to be continued....

regards
Sebastien




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[Murfix]

Awesome build! Very clean

Can you post a close-up picture on how you installed the yellow xt90 connector in the box? Is the connection strong enough?

Bad luck with the wires. I see the insulation is ripped so be careful =/

Aren't you going to cover up your battery? I strongly recommend this in case you hit something or for debris flying around. Lipo's can't handle much physically.


Edit: I just noticed the box from the Gamma in your picture xD Are you Belgian? I live in the Antwerp area.

 

[666yeti666]

hi there, i'm from the netherlands, so that makes us neighbours
I've been to Antwerp several times and really like the city.

For proper mounting of the XT-90 I used a small piece of "90degrees bent aluminium strip" (bought at ... Gamma!) and drilled a lot of small holes in it so the 5 minute epoxy glue has a good hold onto the plastic xt-90 connector. Sandpapered the surface of the xt-90 and used the 5 minute epoxy glue. Then drilled a 3mm hole into the vertical part of the aluminium strip in order to put screw it onto the black abs box.
At the backside of the xt-90 I had to glue a small piece of (epoxy) strip againt it, to prevent bending it inside whilst pushing the other end of the xt-90 connector in, since the connector is very sturdy (but that's good for lower internal resistance of course).
I will try to make some pictures over the weekend.


Battery will be covered maybe. I know lipo is fragile. Was thinking of a thin piece of carbon sheet, just clamp it between the lipo and the velcro strap. I want to keep everything easy and light as possible.

 

[made_in_the_alps_legacy]

The total weight including the 6s 5000mAh lipo is 6.72kg of which I don’t know if it is low, high or average …

it's very good assuming the claim of the world lightest e-skate (I think the boosted board but not sure) is at 6.4 kg :wink:
so CONGRATS !
weird story with this motor... never had to deal with gianshark.co.uk support...
but if the support service is as good as the sell service, you should be confident that they help...

 

[BShady]

wow! really nice build.

one qu: when you said the xt90 plug is a "emergency cut-off" does that mean you pull it while riding if you have to?

 

[torqueboards]

wow! really nice build.

one qu: when you said the xt90 plug is a "emergency cut-off" does that mean you pull it while riding if you have to?

It's just another on/off switch to turn off power from the batteries when you aren't riding. Much smaller than using the 150A/300A Circuit Breaker on/off switches.

 

[666yeti666]

The total weight including the 6s 5000mAh lipo is 6.72kg of which I don’t know if it is low, high or average …

it's very good assuming the claim of the world lightest e-skate (I think the boosted board but not sure) is at 6.4 kg :wink:
so CONGRATS !

thx, by the way, what's the weight of the evolve board ... ?

 

[666yeti666]

wow! really nice build.

one qu: when you said the xt90 plug is a "emergency cut-off" does that mean you pull it while riding if you have to?

well, no not during riding, but it's more in case of emergency, then I just flip the board over and pull it out quickly, which isn't so easy with the standard connectors on the battery.

However, when I stop with riding I will pull out the regular battery connectors, since this one contains the 6.8Ohm/5W antispark resistor.

 

[torqueboards]

yeti - Do you still need the antispark? Is your anti-spark at the battery level or at your emergency cut off part?

Boostedboards is 12-15 lbs. Evolve is about 18.7-23 lbs but has larger range/distance. Other eboards way a ton. Evolve at 18lbs is pretty heavy I think.

 

[stuntmanmike]

Very clean build, very well planned & executed, congratulations!

 

[666yeti666]

thx mike, I can't wait to ride it, but first need a replacement motor

@ torqueboards:
I do need the antispark. I've tried without but got the typical loud tick and that will damage your connectors and also the lifespan of the capacitors on the ESC (the spark is caused by the very high inrush charge current of those capacitors due to their very low internal impedance, also called ESR).

Indeed I noticed the weight of the evolve boards, starting at 8.5kg, so mine isn't too bad...
(by the way I noticed some nice and handy carrying accesoires of evolve : http://evolveskateboards.de/index.php/shop-buy-online/evolve-elektro-skateboards).

 

[torqueboards]

So your antispark is at your battery level or at your on/off plug? You plug battery w/ antispark first then you use the on/off plug?

 

[666yeti666]

The antispark resistor is located at the goldplated 5.5mm connector. I leave the on/off xt-90 plug always in and only remove it for emergency. See schematic at the top of this page

 

[BShady]

However, when I stop with riding I will pull out the regular battery connectors, since this one contains the 6.8Ohm/5W antispark resistor.

why do you have to pull out the battery connectors if the resistor is connected there?

 

[666yeti666]

well, I have to pull it out in order to to start-up next time without a spark.

For your understanding; the resistor is not in series with the batteryconnector the whole time, it is only connected via the resistor for a short time. It is located under the black heatshrink.
See my schematic at the top of this page.
First I hold the male connector against the protruding wire that leads to the 6.8Ohm/5W resistor, now a lower current will flow to the ESC and its capacitors which are charged
Then the male connector is pushed into the male connector without any spark happening.

Here's some pictures to explain.

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[666yeti666]

Can you post a close-up picture on how you installed the yellow xt90 connector in the box? Is the connection strong enough?

here you are :

 

[Murfix]

Can you post a close-up picture on how you installed the yellow xt90 connector in the box? Is the connection strong enough?

here you are :

Thanks neighbour, that helps a lot. I think I'm going to imitate that when I start building my own enclosure.

Fantastic way to implement the anti-spark wire; easy to use and no hassle with extra wires!

 

[beetbocks]

I agree- i think ill be stealing that idea..

 

[666yeti666]

of course, that's why were posting on a forum
(ps. don't forget that the protruding wire must be isolated from the connector of course ...)

I got reply from giantshark.uk about the C6374-200 motor and I have to sent it back to them for inspection ..... suspect this will take another extra weeks ......
(considering to buy one from alien power systems, only downside he has the 170kv version only ...)

 

[beetbocks]

I use the 170kV on my dual 63mm ,ive got a 36T pulley and 90mm wheels on there..just had to change the belt to a 305mm

He does sell 130kv..are they out of stock?

 

[Murfix]

Bruno also mentions on the website that he can make/get the motors with any kv you like. There's no price/lead time listed for these 'custom' motors, but you can try