Author Topic: The Annals Of Improbable Research  (Read 4427 times)

Doktor Howl

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Re: The Annals Of Improbable Research
« Reply #30 on: November 25, 2014, 01:01:10 am »
It was explained to me today that low-volting a motor won't burn it up, it will just "make it go slower".

I kinda had one of those Mesozoic Nigel grins going on, and the fact that anyone got out alive is a testament to my kind & peaceful nature.

Whaaaaat

 :lulz: :lulz: :lulz:

Which?  The ignorance of my coworkers or your smile?

Mesozoic Mister Nigel

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Re: The Annals Of Improbable Research
« Reply #31 on: November 25, 2014, 06:31:39 am »
It was explained to me today that low-volting a motor won't burn it up, it will just "make it go slower".

I kinda had one of those Mesozoic Nigel grins going on, and the fact that anyone got out alive is a testament to my kind & peaceful nature.

Whaaaaat

 :lulz: :lulz: :lulz:

Which?  The ignorance of my coworkers or your smile?

Your co-workers.

I rather like the bit about my smile.
“I’m guessing it was January 2007, a meeting in Bethesda, we got a bag of bees and just started smashing them on the desk,” Charles Wick said. “It was very complicated.”


rong

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Re: The Annals Of Improbable Research
« Reply #32 on: November 25, 2014, 09:39:37 am »
I believe that is true of DC motors...
"he was a smart feller who felt smart"

Doktor Howl

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Re: The Annals Of Improbable Research
« Reply #33 on: November 25, 2014, 01:01:05 pm »
I believe that is true of DC motors...

We don't have a single DC motor in the plant, and my coworkers aren't aware of their existence.

Doktor Howl

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Re: The Annals Of Improbable Research
« Reply #34 on: November 25, 2014, 01:03:55 pm »
Here's some stuff, Rong:  http://www.electrical4us.com/speed-control-of-dc-motor/

But we don't have those.  We have 3 phase t-frame motors.  Bog standard shit.  A few VFDs, which seem to be causing the confusion, as my colleagues are having trouble distinguishing between voltage and frequency.

rong

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Re: The Annals Of Improbable Research
« Reply #35 on: November 25, 2014, 02:21:25 pm »
yeah - we have almost exclusively 3 Phase AC motors and use VFD's where speed control is needed.  We do have a few DC motors in some high torque applications, I don't mess with them much, but they are also on drives (albeit not Frequency drives) - I thought they controlled speed by varying the field voltage, but maybe it is field current?  Honestly, as long as the motor does what I tell it to do, I don't really care how the controller gets it done.
"he was a smart feller who felt smart"

Doktor Howl

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Re: The Annals Of Improbable Research
« Reply #36 on: November 25, 2014, 02:49:23 pm »
yeah - we have almost exclusively 3 Phase AC motors and use VFD's where speed control is needed.  We do have a few DC motors in some high torque applications, I don't mess with them much, but they are also on drives (albeit not Frequency drives) - I thought they controlled speed by varying the field voltage, but maybe it is field current?  Honestly, as long as the motor does what I tell it to do, I don't really care how the controller gets it done.

The link I posted shows how it's done on DC motors.

An inverter or VFD changes the frequency, which has the same effect but doesn't cause the amps to climb.

Reginald Ret

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Re: The Annals Of Improbable Research
« Reply #37 on: November 26, 2014, 10:16:00 pm »
Ok, I'm not an engineer, but even I know that can't possibly be right.

 :weary:

Lower voltage, amps go up.  Resistance follows amps, heat follows resistance, motor goes crispy.

Ohm's Law, 1st year apprentice shit. 

However, These People didn't do an apprenticeship.  The people in question have 1) chemistry and 2) marketing degrees.  Which means they're smarter and know everything, while we oafs step on our knuckles and make grunting and whistling noises.
I get the impression you don't have a lot of fans there.

I hate them and they hate me.  It works for everyone.   :lulz:
Heh, but I meant the cool kind of fans. The kind that make anything they focus on automatically cooler...
Hint hint, wink wink.
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Billiam Poster

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Re: The Annals Of Improbable Research
« Reply #38 on: May 12, 2015, 01:26:00 am »
Sorry i'm late, did someone say Annal?  :fnord:
Joseph K.: I don't pretend to be a martyr, no.
Hastler: Not even a victim of society?
Joseph K.: I am a member of society.
Hastler: Do you think you can persuade the court that you're not responsible by reason of lunacy?
Joseph K.: I think that's what the court wants me to believe. Yes, that's the conspiracy: to persuade us all that the whole world is crazy, formless, meaningless, absurd. That's the dirty game. So I've lost my case. What of it? You, you're losing too. It's all lost, lost. So what? Does that sentence the entire universe to lunacy?

Doktor Howl

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Re: The Annals Of Improbable Research
« Reply #39 on: May 12, 2015, 01:45:42 am »
Sorry i'm late, did someone say Annal?  :fnord:

You're gonna go far, kid.