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Author Topic: Plecter Lab Force-Feedback Motor Question  (Read 2305 times)

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Offline Blair

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Plecter Lab Force-Feedback Motor Question
« on: August 28, 2007, 03:42:44 AM »
To anyone who has used PL's Force-Feedback Motor or Erv,

I'm looking at putting one of the PL motors in my next saber but have never delt with anything other then a lux driven by a driver board before.  I'm slightly confused with the resister requirements.

Is there a chart for what kind of resister is needed for each type of Lux?

I'm working on making my next saber as "slow change" vintage graflex.  What I mean is that I will make up a bunch of different GraflexShop adaptors with different Luxeons (3, K2 and V) and pair a CF SD card with config to each.  This should allow me to show off different Lux types and modify my power needs to the situation.

The biggest problem with this is that I want a feed-back motor installed.

The Big Question: Will this require interchangeable resisters or can I get away with one set "large" resister that will work with all the fully driven Lux?

I don't mind the motor running slower or less powerful (within reason) on a Lux 3 and faster/more powerful on a Lux V.


~Blair

Offline Luke S.

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Re: Plecter Lab Force-Feedback Motor Question
« Reply #1 on: August 28, 2007, 04:32:18 AM »
Here you go man check this out from TCSS.  I don't have much experience here but this should help you out.



http://www.thecustomsabershop.com/t-resistors.aspx

Offline Blair

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Re: Plecter Lab Force-Feedback Motor Question
« Reply #2 on: August 28, 2007, 06:13:25 AM »
That helps a lot with the first part... :)

Now the question still remains...

The Big Question: Will this require interchangeable resisters or can I get away with one set "large" resister that will work with all the fully driven Lux?

I don't mind the motor running slower or less powerful (within reason) on a Lux 3 and faster/more powerful on a Lux V.

Offline Blair

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Re: Plecter Lab Force-Feedback Motor Question
« Reply #3 on: August 28, 2007, 06:20:08 AM »
I've just noticed the following in the 2.1 CF manual regarding Feedback motors:

>Be sure to use at least a ½ watt resistor in all cases.
>An easy workaround is to use a multiturn trimming potentiometer of 100Ω or 1kΩ.

Does anyone know if I added a multiturn trimming Potentiometer with enough range... do I need a resistor at all?

Can't I just set the Potentiometer to the general desired resistance and adjust slightly for each LED config?

Or am I miss-understanding the purpose of a Potentiometer?

The confused as always...

~Blair

Offline erv

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Re: Plecter Lab Force-Feedback Motor Question
« Reply #4 on: August 28, 2007, 12:57:17 PM »
sorry to be late on that  :)
mmm... It's going to be "hard" if you want to get something working with 3 different luxeons.
- Lux III & K2 : about 3.7V for white/blue/green/cyan, 2.85V for the other redish
- Lux V : about 6.8 V

In this case, the potentiometer / trimmer / adjustable multiturn resistor is strongly advise. Well, actually, I'm using that on ALL my designs, so great to tune the feed back and adapt it to how the hilt transmits vibrations etc.
To get the required value of the potentiometer, make the calculation using the lux V, since it has the biggest forward voltage.

For instance, my motor is doing great vibrations at .9V and takes 50 mA.
Lux V : (6.8 - .9) / 0.05 = 118 ohm

If you want to get a nice trimming span, take a 220 ohm adjustable resistor, preferably a multiturn trimmer to get an accurate selection of the speed of the motor. It will also work with a 1kohm adjustable resistor, I've done it too.
And then... you'll need a hole or something to get an access to the trimmer's screw to change the speed depending on the luxeon you're using.

Hope this helps !
Erv'(

Offline Blair

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Re: Plecter Lab Force-Feedback Motor Question
« Reply #5 on: August 29, 2007, 12:53:15 AM »
Thanks erv...

That's exactly what I wanted to hear.  ;D Boy that doesn't happen often.

Anyways, I'm assuming that with one 220 ohm adjustable resistor I shouldn't need another resistor in line with it.  Just the one adjustable resistor should be plenty.

Again... thanks to everyone. I'm useless with these electrical matters.

~Blair