On 02/01/2016 10:31, The Natural Philosopher wrote:
That's a real shame but there are enough other models out there that
take "slip" into account. You do know what "slip" is?
You seem to be deliberately misunderstanding that reactive components do
not vary significantly, but we are talking of reactive currents. These
are two entirely different quantities, one measured in Henrys and the
other in Amps.
An example of what I assume are real motor characteristics
You can do your own sums, but if you calculate reactive current at 50%,
75% and 100% loads they will be around 127A, 136A and 150A respectively.
At one extreme the reactive current at stall is 4.8 x full load current.
At full load the reactive current would be 0.6 x full load current. That
is a range of 8:1 in reactive current.
I can assure you reactive current does change over motor load.
On Thu, 31 Dec 2015 13:51:44 -0800, tabbypurr wrote:
I doubt anyone with any sense would waste their time with you. You have
already demonstrated that:
A) electronics is not your field (to put it politely)
B) when things are patiently explained to you at great length by several
well-meaning people you persist in clinging to your erroneous notions of
how things work.
If you're not a troll you certainly have a sub-standard IQ.
the E6 range is 1, 1.5, 2.2, 3.3, 4.7, 6.8 ....
So either a 47uF or a 68uF would be likely choices.
56 is part of the E12 series and 62 would be E24
It's possible you could get a high voltage tight tolerance AC capacitor,
but mostly in this game its all about 'near enough'
If you tell a lie big enough and keep repeating it, people will
eventually come to believe it. The lie can be maintained only for such
You seem to have an association in your mind between 440V and 3-phase
since all the 440Vs you've ever seen have probably been 3-phase. But that
doesn't mean that you can't have 440V single phase. You can also have
230V 3-phase, too, which I believe is the standard in the US.
I know I'm not a power engineer - but I thought it was 240V phase-ground
(which is what we all have in our houses) and 415v phase-phase?
AIUI the US uses two phase 220V for power equipment like tumble driers.
Each is 110V from earth, and opposite.
To be pedantic, the voltage within the Eurozone is now 230V and 400V
That is my understanding as well except they are derived from a single
phase. Each property or set of properties are supplied with 220v
balanced either side of earth, much like a 110v tool isolating
transformer that is -55V / +55V either side of earth.
It is of course possible to have any supply voltage if it suits a
On Fri, 01 Jan 2016 20:14:27 +0000, Vir Campestris wrote:
I'm getting a bit long in the tooth and out of date with all the various
standards, to be honest. ISTR, though, that back in the 1970s, a lot of
3ph machinery ran off 440V - but that was 40 years ago so it may well be
a bit lower today.
It completely slipped my mind, but I've got an industrial, 3ph lathe out
in the workshop that runs off 240V 3ph. Since I don't have 3ph here I had
to buy a single-to-3ph converter to run it. Works like a charm, though!
Very civilised having soft starts and infinitely variable speeds with no
noticeable loss of torque (which was a big surprise).
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