Re: comparative efficiency test


"CWatters" <colin.watters@xxxxxxxxxxxxxxxxxxx> wrote in message
news:13jeno2c8be05b7@xxxxxxxxxxxxxxxxxxxxx
:
: "Androcles" <Engineer@xxxxxxxxxxxxxxxxx> wrote in message
: news:g_IZi.106460$vI1.58477@xxxxxxxxxxxxxxxxxxxxxxxxxxxx
: >
: > "CWatters" <colin.watters@xxxxxxxxxxxxxxxxxxx> wrote in message
: > news:13jemn3gavl4q54@xxxxxxxxxxxxxxxxxxxxx
: > :
: > : "Androcles" <Engineer@xxxxxxxxxxxxxxxxx> wrote in message
: > : news:DlCZi.254476$lV4.92995@xxxxxxxxxxxxxxxxxxxxxxxxxxxx
: > : > Do not quote me unless I actually said it, you prat.
: > :
: > : I will if you remember to mark text you quote.
: >
: > There was nothing of mine to mark, you moron, but ok,
: > quote this:
:
: Not your own text dumbo.
:
: Look, several posts back you replied to a post by Camilo and appended this
: one liner...
:
: "Cheap test, cheap result."
:
: Go back an look at that post you made. Note how you quoted Camilo's text
: without marking it. When I replied OE assumed you had written the lot.
THAT
: is the cause of the error you accuse me of. If that's my error so be it.
I'm
: sure I've made worse.
:

If I'm in error then I apologise. However, this is the offending post:

"CWatters" <colin.watters@xxxxxxxxxxxxxxxxxxx> wrote in message
news:13jdmq721b0id9d@xxxxxxxxxxxxxxxxxxxxx
:
.... My name here
: >
: > "Camilo" <camilogil@xxxxxxxxxxxxxx> wrote in message
: > news:1194730566.552533.72740@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
: >
: > > Sounds like a daft method if you ask me - unless your motor is very
low
: > > rpm.
: >
: > is daft but cheaper, I have no money to buy a dynamometer
:
: You do not need to buy a dynamometer...


Now,
CWatters wrote: You do not need to buy a dynamometer...
Camel low wrote: is daft but cheaper...
Unknown_1 wrote: Sounds like a daft method if you ask me...
because Unknown_2 snipped.

Where am I supposed to mark my own text if I haven't written
any?, and, if I had, that too would be snipped?

The oddest thing of all is the title, nobody has mentioned
measuring the damned power drawn from the supply
(except JM Albuquerque), only ways to measure the frigging
mechanical horsepower!

The efficiency depends on the heat wasted in the motor
windings and not just the energy transferred in doing
mechanical work.

The question was correctly answered by JM Albuquerque
"Camel low" <camilo...@xxxxxxxxxxxxxx> escreveu na mensagem
news:1194656959.306840.108850@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx


hi everybody. From your experience or knowledge ¿how would you
prepare a comparative efficiency test between two similar DC motor?
(I mean, suppose you invent a new kind of electric motor and you need
to know and probe if it´s better than existing others, ¿how would
you do that?)



Efficiency = Power out / Power in

Power out = Torque * angular velocity
(Torque in Nm and angular velocity in rad/s)


Power in = Voltage * Current



and the low camel then snipped like a troll without marking
text and said

"Camel low" <camilogil@xxxxxxxxxxxxxx> wrote in message
news:1194661752.692980.217570@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx

Power out = Torque * angular velocity
(Torque in Nm and angular velocity in rad/s)

well but without using a torque meter ¿how would you measure motor´s
torque?

So I added
quote:
well but without using a bathroom scale ¿how would you weigh yourself?
well but without using a ruler ¿how would you measure a meter?
well but without using a clock or sundial ¿how would you know the time?
well but...
unquote.

Later the low camel writes
"that´s the right answer... I really had thought about that method
but I was unsure of it, but you confirmed to me. "

That's a fuckin' smart-arse troll if ever there was one.
First he's pretending he's invented a new kind of motor, then
he's pretending he invented the fuckin' windlass.
There's a pic of him here on the left, pulling the wrong way.
http://www3.shropshire-cc.gov.uk/roots/images/ind_J03a.jpg



.