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Old 04-27-2011, 05:12 PM   #16
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Originally Posted by gubbs3 View Post
???
The octawinds are smoother and run a bit cooler. The original X12s are pretty brutal. If you read the original release notes...

LRP have introduced the 2nd generation of their XTEC X12 technology, which feature an 8 time (Octa) winding instead of the previous 4 time winding, the effect is a different power characteristic resulting in much higher performance. The LRP R&D team has increased the number of copper wires used in the motor, resulting in lower resistance and thanks to the lower heat development of the octa wind less energy is lost resulting in higher efficiency. The end result is more power.
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Old 04-28-2011, 03:06 AM   #17
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useless....Internet drunkards who think they possess the ultimate in knowledge.
This is like shooting apples in a barrel...

That would not be the ultimate in knowledge, it would be the ultimate in Physics. No one possess it, everyone has access to it and it governs all our lives every day. If I'm drunk on knowledge, I hope I never get sober.

Now, where's my drinking buddy Wingracer - he owes me a Newton's Third Law of Motion, on the rocks!!
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Old 04-28-2011, 10:56 AM   #18
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Now, where's my drinking buddy Wingracer - he owes me a Newton's Third Law of Motion, on the rocks!!
I'm all out, but how about some of Albert's Relativity with a dash of quantum bitters
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Old 04-28-2011, 03:15 PM   #19
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I'm all out, but how about some of Albert's Relativity with a dash of quantum bitters
Great! We could drink that the day before yesterday and still be home for dinner tomorrow!

(I think we'd better stop this before they think we are... well, whatever they think we are!! )
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Old 05-05-2011, 12:12 AM   #20
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Firstly i would like to say sorry to WingRacer for being rude..

But you can`t trow out formulas without mentioning the units its measured in.
It happens all the time and it is frustrating.

time + distance = timetravel.

It doesn`t work like that..

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For an electric motor, the instantaneous electrical power P delivered to a component is given by P (t) = V (t) x I (t)
That would be correct if its a DC motor.. it aint..

Pin= U x I x Rot of 3 x cos fi. add Efficency to get Power out.

CraigM said whats needed to be said.. they are supposed to have a higher efficency++

Last edited by MatsNorway; 05-05-2011 at 12:26 AM.
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Old 05-05-2011, 01:11 PM   #21
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Sorry Mats, but not correct. Our motors are DC motors - they are powered by a DC power source, not AC. The switching of the coils by the speed controller is no different to the switching perviously carried out by a commutator on a BR motor. Check it out - these are DC electric motors!

And the power calculation for that is actually here, as well as in my fine reference book!

http://en.wikipedia.org/wiki/Power_(physics)
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Old 05-06-2011, 03:42 AM   #22
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Finally.. thanks.

"Although BLDC motors are practically identical to permanent magnet AC motors"

So it lacks the cos fi.. but it still got overlap and three phase..

Below sentence explains why the newer motor gets lower and lower Kv ratings..

"To achieve full rated torque, the coils in a stepper motor must reach their full rated current during each step. Winding inductance and reverse EMF generated by a moving rotor tend to resist changes in drive current, so that as the motor speeds up, less and less time is spent at full current — thus reducing motor torque. As speeds further increase, the current will not reach the rated value, and eventually the motor will cease to produce torque."


I asked Venom and Trinity but for some reason they all said 3 phase motor.. but they were not sure.. Trinity said its probably a syncron type, who now seems close but no cigar.

Seems hard to get trough too the tech guys at the respective manufacturers.

Last edited by MatsNorway; 05-06-2011 at 04:10 AM.
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Old 05-06-2011, 08:48 PM   #23
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If a tree falls in the woods and no one is around to run an octa wind..

Which one will be faster if both winds are equal...
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Old 05-07-2011, 02:42 AM   #24
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To octa wind or not octa wind?
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Old 05-07-2011, 02:16 PM   #25
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Octa-wind... LRP would not have made it if the did not think it was better.
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Old 05-07-2011, 05:16 PM   #26
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Better indeed.
For more sales.
I think the valuable thing to take away from reading all of this, is that 90% of what is written is crap. 5% is made up. The other 10% is bollocks.
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Old 05-09-2011, 01:28 PM   #27
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Which means 3.5 of your words are bollocks. I'll take "better indeed. For mo" Which seems to conform to the 90% Rule... But then I'm missing the other 5% that makes up the 105% of your post... No, you're right, that post falls into the 90%...
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Old 05-18-2011, 02:54 PM   #28
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