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/diy/ - Do It Yourself

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1215593 No.1215593 [Reply] [Original]

i was out walking the other day and i found a broken hoverboard, the ones with 2 wheels. the aluminum frame was broken so thatd why i assume the threw it out. anyways, since then ive salvaged the 2 motors/wheels and thr battery pack, and i was thinking about bolting a sprocket to the end of the wheel and chaining it to my bike to effectively make an ebike. i have a few questions.
1. whats the best way to drive the motors? ive looked up videos of people driving them with just the 3 thicker wires, but do i need to use the 5 pin connector to use it safely? is it just 3 phase power? what sort of driver should i get?
2. how should i charge the battery? its a 10s, 36v li-ion battery pack made of 18650 cells. it already has a board on it, so could i pump 36v into it anf have it charge itself, or will i need a more specialized charger, like an imax one?
i appriciate any responses and there will be plenty more pictures posted

>> No.1215595
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1215595

heres a picture of all the connections comming out of the hub motors.

>> No.1215597
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1215597

and a picture of what i think is the bms, unplugged from the battery pack of course. again, any replies are appriciated.

>> No.1215598

so sorry for all of the sideways photos. cant fix them now...

>> No.1215601

>>1215593
Any idea what the 5 pin is? Might be able to look up the motors. My guess would be an encoder for feedback, but that would be 4 wires for a 2 channel encoder.

My guess is that it's brushless DC motor and encoder(?) In each assembly. The three thicker wires are likely phases for the bldc. Many ways to drive them, easiest to used a specialized IC. I've also used full VFDs, bu t that was for an industrial 24k rpm spindle, so def overkill, especially for an ebike.

>tl;dr find datasheets

>> No.1215602

>>1215601
>>1215593
If you still have the rest of the guys from the thing, look up the numbers in the big chips for clues as to how they were doing it. Anything that's duplicated on the board is likely one for each motor, which will help figure out how to drive them.

>> No.1215604

>>1215602
*guts

>> No.1215627

>>1215601
The 5 pin is for hall effect sensors that do like you said - provide feedback to the controller so the controller knows where the poles are.

>> No.1215639

>>1215627
is it possible to drive the motors without giving the driver any feedback? like ive said, ive seen at least one video of a guy driving it just through a hobby motor driver hooked up to the 3 thicker leads. i want to keep this as simple as possible as im not too farmilliar with electronics and junk.

>> No.1215640

https://youtu.be/LJzoy2TJXFk
video in question

>> No.1215645

>>1215639
>is it possible to drive the motors without giving the driver any feedback?

Yes, as long as the controller is designed to do so. Most RC controllers are, although they might not have favorable voltage/current characteristics for this.

Might be better off with a sensorless ebike/scooter controller. The caveat with either of these is that they aren't as smooth at low speeds. If you have to buy a controller, I'd suggest just getting one that uses the sensors.

>> No.1215659

>>1215639
yes it's possible but you lose out on a lot of torque.

>> No.1215680

>>1215645
>>1215659
sounds like i need to use the sensors then, its probably going to be working a lot of low torque. what would i google in order to find one then. the motors themselves are 350w, is finding one at that wattage possible cheaply?

>> No.1215694

>>1215680

"brushless ebike controller"
"brushless scooter controller"

You need to know what the nominal voltage of the pack is, though. Whatever controller you get needs to have a max volt rating that matches the batteries. A higher voltage rating is okay only if the controller doesn't have a low-voltage cutout, which is often included to protect the batteries from over-discharge.

The amp rating (which the controller will set as a limit) should be at or lower than the maximum that the batteries can provide. Going too high will either damage the batteries over time, or trip any over-current sensing on the battery's protection circuit.

350W each or 350W total? 700W sounds like a lot for a hoverboard, but IDK...

>> No.1215771

>>1215694
theyre 350w each, so 700w total. i know, theyre probably exagerating, but thatsbthe specs i got when looking it up.

>> No.1215953

i still need a way to charge the batteries. how do i safely charge a 36v li-ion batter pack?

>> No.1216303

>>1215953
You still have the rest of the hoverboard? Look it up, see if you can just buy the charger for it.

>> No.1216534

>>1215593
Get a wtf ever voltage controller the motors run. Bonus if 2 12 volt wire them as 24volt. Tncscooters dot com has cheap 24 volt controller and throttle.

Be sure and bolt a freewheel off an old bike so when the motors arent spinniing u can oedle or coast

>> No.1216535

>>1215595
SWEET. They have hub motors? Any technical info? Stickers anywhere or badges on the motors?

>> No.1216537

>>1215639
Well, if they 12v 2 relays and a push button os quick and dirty