[Sanghera]

Hi all,
I was just wondering if the Xylotex board can handle 2.5 amps continuous, and 35 Volts Continuous? What are the recommended amps and voltage for continuous use?
Thanks.

[boxwood]

hmmm That would probably be best answered by the manufacture

[email protected]

[ger21]

It can handle the 2.5a as long as you have a fan cooling it.

The 35V, on the other hand, is the total MAX V including EMF generated by the motors. Because the EMF can vary, usually 27 to 30V is the recommended MAX voltage. But, you're probably better off running at 24V to be safe, as there are no gaurantees that running at 30V will keep you under the 35V max.

[Sanghera]

Sorry to sound stupid, but what is EMF? Also, take a look at these motors, what do ya think about them for the Xylotex if you please.

http://cgi.ebay.ca/ws/eBayISAPI.dll?...EBWA%3AIT&rd=1

The seller says 2.9 Amps Unipolar, 1.45 Amps is Bipolar Series, and 5.8 Amps Bipolar Parallal. At 3.5 Volts. Are all the motors wirings at 3.5 Volts???
Would these work for the Xylotex.
Am I right when I say this, Bipolar Series gives you the same amount of torque as Bipolar Parallal, but Bipolar Series is slower? Could you give me an guesstimate on how much speed I lose if this is correct? That's a lot of questions, but any info. about this would help me out.
Thank you so much for your time.
I really appreciate it. :rainfro:

[ger21]

The specs you're listing are wrong. Bipolar parallel amps are exactly double bipolar series amps. Unipoal amps should be approximately 1.4 times bipolar series amps. Seems like it might be the following, but I'm not sure:

Bipolar series - 2.9a
Bipolar Parallel - 5.8a
Unipolar - 4a

The voltage varies according to the a. Bipolar series V is double bipolar parallel...

What are all the specs on the motor plate?


How much more torque bipolar parallel has over bipolar series has is dependent on speed. The faster you go, the greater the difference.

As for the Xylotex, I need to know the correct specs for the motor. But, if it is 2.9a bipolar series, you'll get about 86%, or about 170oz-in of torque from this motor and a Xylotex.

[Sanghera]

I don't have the motors yet, but when I do, I'll reply.
Thanks.

[Sanghera1]

The seller says that it is indeed the 2.9 Amps for Unipolar, the motor has 8 wires. So, what does this mean for other wiring possibilities? Does this mean that in Bipolar series I will probably get the full torque? So does it go like this:
Unipolar : 2.9 A
Bipolar Series: 2.07A
Bipolar Parallel: 4.14A
Is that what this should be if 2.9A is the Unipolar rating?
Is there any way that you can tell for certain? (without taking the motor to the max and blowing it)?
Thanks.

[Sanghera1]

Hello?
Thanks.

[ger21]

The seller says that it is indeed the 2.9 Amps for Unipolar, the motor has 8 wires. So, what does this mean for other wiring possibilities? Does this mean that in Bipolar series I will probably get the full torque? So does it go like this:
Unipolar : 2.9 A
Bipolar Series: 2.07A
Bipolar Parallel: 4.14A
Is that what this should be if 2.9A is the Unipolar rating?
Is there any way that you can tell for certain? (without taking the motor to the max and blowing it)?
Thanks.

If the 2.9a unipolatr is correct, then those should be close to the correct numbers. If you know the motors rated voltage, you can figure out the current by checking the coils resistance. V/R = A. But, with an 8 wire motor, I believe you need to check the resistance of 2 coils wired in series or parallel and use that #, not the resistance between 2 wires.

If they are 2.07a series, then yes, you'll get full torque with the Xylotex at low speeds, but you'll have less torque at higher speeds than if running them parallel @ 4a. (But you can't do that with a Xylotex)

[Sanghera1]

Hmm.... I will see when the motors arrive I guess.
Thanks for the help.

[Sanghera]

Yup, the 2.9 Unipolar Amps. It says 2.9 Amps at 1.16 Ohms. So if I want to run these motors in Bipolar series at 1.45 Amps, would the ohms be 0.58 Ohms? I want to know, how to run the motors at a higher voltage than rated with the Xylotex? I have heard that it is safe to run them at a higher voltage for more speed, how do you do this without increasing the Amps and blowing the motor? Is it possible?
Thanks.

[ger21]

volts = amps x ohms. 2.9x1.16=3.37V Look at the previous posts. Bipolar series should be 2.07a. Ohms would be 2.32. 2.07x2.32 = 4.8V Bipolar parallel would be 4.14a, .58ohms, 2.4volts.

The Xylotex runs at whatever voltage you hook up to it. you just set the current to the correct amount, and you're all set. Just use a 24V to 30V supply, that's all you have to do. The Xylotex regulates the current to no more than the set amount. More voltage helps the current stay constant at higher rpm's (simplified explanation). Too many amps will damage the motor, so don't set it to any higher than the rated value. Xylotex actually recommends you run it a little lower.

[Sanghera]

I mean, I have heard of people running their motors above rated voltage, so if I'm running at 4.8V Bipolar Series and I want more speed, how do I set this without turning up more amps?
Thanks for the information I really appreciate it.

[ger21]

I know what you're asking. As I've already said, you don't have to do anything. The amps stay the same (controlled by the Xylotex) and the motor runs at whatever voltage the power supply is providing. If you use a 24V power supply, the motor runs at 24V.

[Sanghera]

Oh cool, and I have a little adjuster for the voltage on the board, so If I have a 12 Volt supply, that means each motor gets about 4 Volts.
Thanks Gerry and others, you've been a great help to me, not only in this post.
I really appreciate it.

[ger21]

Originally posted by Sanghera
Oh cool, and I have a little adjuster for the voltage on the board, so If I have a 12 Volt supply, that means each motor gets about 4 Volts.
Thanks Gerry and others, you've been a great help to me, not only in this post.
I really appreciate it.

No, not exactly. Each motor will get 12V.Each motor will get whatever voltage the power supply is outputting. The "adjuster" (Vref) on the board is to set the current, 2.07 amps for your bipolar series. With a voltmeter, you need to set the the pot so the voltage measures about 2.9V (2.07x1.44). See the Instructions for more detailed info.

[lancedulak]

The xylotex board will handle 2.5a . Ive seen jeff and others reccomend you run both slightly under. I run mine at about 2.1-2.3 amps ( i forgot the exact number) and 31v with a fan. Its not risking the board because of spikes etc for that extra HAIR of speed or power (think volts=speed amps=power).

[Sanghera]

Thanks.

[Sanghera]

So I just need to do some fine tuning before I get started.
Thanks.

[Sanghera]

I have been playing with my motors for a while now, and was wanting to get some more speed out of them with a little more torque if I can. If I wired these Bipolar Parallel = 4.14 amps or so, and only set them at 2.3 amps, would I get better performace than if I wired them Bipolar Series = 2.07 amps, at 2 amps? Would I get more torque at higher rpm this way or does the +-1.5 amp loss for the Bipolar Parallel wiring tip the scale and make no improvement. Is this possible to calculate?
Thanks.