Brushless systems

[franki]

hi, I have a quick question! Is it possible to shorten the wires on a brushless system?? I only ask because a lot of people don't seem to so I was thinking do they have to be a set lenth??

sorry if this sounds daft

[Big G]

yes it's possible. I wouldn't advise messing with the sensor wire length though.

[Marvin]

Yes of course! I think some people leave them longer as they regularly change cars.

The sensor lead length can be changed, but you'd need to be fairly confident with soldering, and make sure the right wires are soldered together - the ESC won't like it otherwise.

[MALLET]

Hi Franky,

Are these short enough for you




You can do it you'll have no problems, and you can buy different size sensor wires for it.

Tim

[shannow95]

Hi,
Just a small tip I've been told is that you can change the lenght of the wires no problem but you need to have them even in lenght . As the ESC is sending pulsions like 123123123123 fast (40k+ rev/min) some wire difference in lenght will change this timing 1..2.31..2. 3 giving very tiny acceleration and breaking . You may loose efficiency I think and probably a bit of power . I've never done the maths to see how many % it will really cost you .

My two cents

[Marvin]

That's only going to be noticeable if you're the worlds best driver ever, on a very fast motor, and the wires of drastically different length.

The electron flow along the wires (IE current) is at the speed of light (3 x 10^8m/s) - I highly doubt that a couple of mm will make any discernable difference.

[danDanEFC]

I thought the speed of electron flow was about 6cm per second.

It doesnt make any difference to the answer to the original question so please feel free to ignore

[shannow95]

Right I've searched on the web presumably you are both right . There's the speed of the moving stuff in the wire that is very slow (couple cm/s to more than some cm/hour depends on the current) and the instant speed of electron which is very fast . The instant speed of electron is from what I've understood like pushing a ball in a pipe 100 foot long filled up with balls . You push the ball 100 foot further a ball gets out instantly but you didn't actualy pushed the ball a 100ft/"the time it took to insert the ball" .

We use copper wire for our cars and I've found that the instantaneous speed of electrons in copper at room temperature is about 1.6 x 10^8 cm/sec

So quickly thinking over an inch error in wire lenght that's a 0.000000015625 second différence at that speed ... I've found that a lot of ESC go up to 30khz (0.00005s /pulse) .

So at full speed presumably that would be an error of 0.03% (I divided the
fastest pulse the esc offers by the speed of the electron throught that inch difference)

So yeah It seems to be very very small error lol even for a pro I don't think he'll spot it .
We're safe

I hope I didn't mixed up anything in these very aproximative calcultation

[MatJohnson]

Thats got to be one the most detailed evaluations of a post i've ever seen

[danDanEFC]

Originally Posted by Toadeh

Thats got to be one the most detailed evaluations of a post i've ever seen

and the best answer came from Mallet's picture of a Durango.

[shannow95]

He has an incredibly tidy chassis too .

[MALLET]

Originally Posted by shannow95

He has an incredibly tidy chassis too .

You want to see the wife's chassis Mate

Cheers lads I like to keep my electrics tidy, but me garage is a mess