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KB2VXA > INFO 05.07.02 20:59l 58 Lines 2399 Bytes #999 (0) @ WW
BID : 50697_WT3V
Read: DB0FHN GUEST
Subj: Re: VK3ABK > Tesla's motors
Path: DB0FHN<DB0ZWI<DB0CHZ<OK0PKL<OK0PPL<RZ6HXA<SP7MGD<ON0BEL<KD4GBA<KF9UG<
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Sent: 020701/1739Z @:WT3V.#JS.NJ.USA.NOAM #:50697 [Lakehurst] $:50697_WT3V
From: KB2VXA@WT3V.#JS.NJ.USA.NOAM
To : INFO@WW
Hello Dick and Tesla Coil enthusiasts,
This has turned into such a lively and informative discussion I am truely
amazed! I haven't seen the like in years.
Being unfamiliar with the mains frequency in Oz but recognizing the basic
British system I can venture a guess it is 50~. This leads to another
fairly educated guess that you should have no problem using American
equipment designed for a 230V (nominal) 60~ supply. The mains voltage
tolerance is + - 6% and everything is designed to comply. This MAY
compensate in MOST instances BUT because a 60~ bit such as a motor will
draw about the same amount MORE on a 50~ supply you may barely break even
and overheating may be a problem. The slight increas in transformer Ix
shouldn't be a problem however. Considering basic VAR, your gear should
work just fine here as does European equipment.
You mentioned "Tesla's motors" obviously referring to the standard
induction motor, so I have a question I would LOVE to see you guys answer
just for fun. Put your brains to work, this could get VERY interesting.
I can give you the US standard based on 60~ only because it's easier for
me to work with from memory. The exact figures are fairly unimportant and
supplied for reference only.
The rotational speed of an alternator shaft is held constant at 2400 RPM
to provide a highly regulated 60~ phase contant output so that
alternators can be ganged for more output and all equipment in the system
from alternator to motor will work properly.
The rotational speed of an induction motor shaft is 1700 RPM standard.
OK, why then does the alternator shaft turn at 2400 RPM while the motor
it drives turns at 1700 RPM instead of 2400? Shouldn't they turn at the
same speed? Since the motor spins SLOWER than the alternator, someone
tell us WHY.
That should give you something to chew on for a while. Like I said, the
numbers are there only for reference, just tell us why the motor turns
slower in SIMPLE terms please, for the benifit of those who don't read
Greek. BTW, don't you SVs feel proud your alphabet is the language of
electrical engineers?
*********************************
I'm a technician, not a magician!
*********************************
73 de Warren, KB2VXA
e-mail: kb2vxa@juno.com
Message timed: 17:39 on 01 Jul 02 UTC
[ Received via HF CLOVER at KB6LE ]
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