Posted by vaughn on April 12, 2011, 12:09 am
>>Those two quite common examples seem to refute your
>>absolute determination that ALL rotating electric machinery
>>is operated with AC motors...
>>
>>How so?
> Look deeper in the motor. It's all AC on the inside. ;-)
Exactly!
Vaughn
Posted by sno on April 12, 2011, 6:21 am
On 4/11/2011 6:16 PM, krw@att.bizzzzzzzzzzzz wrote:
> wrote:
>>
>>>
>>> Not he's got it right except for the fact that allr otating electric
>>> lmachinary is AC.
>>
>> Those two quite common examples seem to refute your
>> absolute determination that ALL rotating electric machinery
>> is operated with AC motors...
>>
>> How so?
> Look deeper in the motor. It's all AC on the inside. ;-)
I think you are pushing it....the brushes on a dc motor "guide" the dc
to different windings.....it is still dc...
In an ac motor the windings are generally in parallel...all the ac is
applied at one time....
I think I got that right....is a long time since I covered motor
theory..<grin>...the ac is not "chopped up"....or guided anywhere....
You could say that all electric motors operate the same....as they all
depend on magnetism (all generally used motors...there are some operate
on static electricity, etc)
have fun...sno
--
Correct Scientific Terminology:
Hypothesis - a guess as to why or how something occurs
Theory - a hypothesis that has been checked by enough experiments
to be generally assumed to be true.
Law - a hypothesis that has been checked by enough experiments
in enough different ways that it is assumed to be truer then a theory.
Note: nothing is proven in science, things are assumed to be true.
Posted by krw@att.bizzzzzzzzzzzz on April 13, 2011, 4:00 am
>On 4/11/2011 6:16 PM, krw@att.bizzzzzzzzzzzz wrote:
>> wrote:
>>
>>>
>>>>
>>>> Not he's got it right except for the fact that allr otating electric
>>>> lmachinary is AC.
>>>
>>> Those two quite common examples seem to refute your
>>> absolute determination that ALL rotating electric machinery
>>> is operated with AC motors...
>>>
>>> How so?
>>
>>
>> Look deeper in the motor. It's all AC on the inside. ;-)
>I think you are pushing it....the brushes on a dc motor "guide" the dc
>to different windings.....it is still dc...
No, it most definitely is *not*. Turn the motor to the next commutator step
and you'll see that the current reverses in the winding.
>In an ac motor the windings are generally in parallel...all the ac is
>applied at one time....
>I think I got that right....is a long time since I covered motor
>theory..<grin>...the ac is not "chopped up"....or guided anywhere....
That's why there are no brushes in AC motors? ;-)
>You could say that all electric motors operate the same....as they all
>depend on magnetism (all generally used motors...there are some operate
>on static electricity, etc)
>have fun...sno
...and you need a rotating magnetic field. That is, you need AC. ;-)
Posted by David Nebenzahl on April 11, 2011, 10:29 pm
On 4/11/2011 2:42 PM Evan spake thus:
>
>> Not he's got it right except for the fact that allr otating
>> electric lmachinary is AC.
>
> I love how you can state that without any sort of qualification...
... especially when it's pure BS. But that's our Harry.
> You seem to have forgotten about higher end bathroom fans
> which use an inverter to operate a DC motor which is much
> quieter than an AC motor...
Welll, since this is a.h.r, and since you're picking a nit, let me pick
yours. I've installed several "higher-end" vent fans (Panasonic), all of
which use AC induction motors which are very quiet. Which bath fans use
the setup you described? (Besides which, why in the world would you need
an "inverter" to run a DC motor from an AC supply? Perhaps you meant
"rectifier"?)
--
The current state of literacy in our advanced civilization:
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wassup
nuttin
wan2 hang
k
where
here
k
l8tr
by
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Posted by krw@att.bizzzzzzzzzzzz on April 13, 2011, 4:02 am
wrote:
>> You're referring to steppers. Most spindle motors aren't steppers, but simple
>> DC motors (2-wire, no feedback sensors or additional windings). I know; I've
>> got a box full of 'em that I've removed from old CD and DVD drives. No
>> pulsating DC, no PWM (which in any case isn't AC anyhow).
>Wrong. Spindle motors either have brushes and commutators or else the solid
>state equivalent. Otherwise, they can't work. Just like the commutators &
>brush system, that electronic "stuff" may be built directly into the motor
where
>you can't see it, but it's still there.
Correct. David should refrain from any EE lectures. He hasn't got it in him.
>>absolute determination that ALL rotating electric machinery
>>is operated with AC motors...
>>
>>How so?
> Look deeper in the motor. It's all AC on the inside. ;-)