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Re: Oriental motor



Original poster: "Terry Blake" <tb3@xxxxxxx>

Hi Scott,

Here is a webpage where I do some tests on motors to check for being
synchronous.
http://www.tb3.com/tesla/sparkgaps/sync/index.html

To that page, I have just added a short video of my testing with an Oriental
Motor.
http://www.tb3.com/tesla/sparkgaps/sync/syncmotor.mpg

We can't all have our own stroboscope, so a flourescent light is the best
thing I had.
It looks like it works fine.  The motor clearly locks up at the same
position all the time.

If you feel this is not a valid test, please explain what I am missing.

Terry Blake
http://www.tb3.com/



----- Original Message -----
From: "Tesla list" <tesla@xxxxxxxxxx>
To: <tesla@xxxxxxxxxx>
Sent: Sunday, May 01, 2005 5:42 PM
Subject: Re: Oriental motor


> Original poster: "Scott Hanson" <huil888@xxxxxxxxxxxx> > > Christoph - > > To the best of my knowledge (& the knowledge of the Oriental Motor Co. > technical sales office in the US), Oriental does not make nor has ever made > salient-pole synchronous AC induction motors. (If anyone can demonstrate > otherwise, please let me know!) > > They make a multitude of different models of synchronous AC induction > motors, but none of these are of salient pole construction. As discussed at > length on this list, standard synchronous AC induction motors can be > modified for salient-pole operation by machining flats on the rotor. > > For standard AC "synchronous" induction motors, "synchronous" just means > that the rotor locks into an operating speed that is dictated by the AC line > frequency and the number of magnetic poles the motor is built with (physical > magnetic poles on the rotor and stator lamination stack). Standard > synchronous induction motors will have multiple possible rotor positions > when the motor achieves "lock up" & synchronizes with line frequency. > > For 60Hz line frequency, 3600 RPM salient pole motors will have only two > possible rotor positions at lockup (180 degrees apart); 1800 RPM motors will > have four possible rotor positions (90 degrees apart). If you build your RSG > disk with electrodes in multiples of (2) or (4), the (2) or (4) possible > "lock-up" positions won't matter because you will always have a > flying/stationary electrode pair coming into alignment. > > I believe that if Terry Blake checked his motor with a real stroboscope > synchronized to the AC line, he would find that it was NOT a salient-pole > motor. > > Regards, > Scott Hanson > ----- Original Message ----- > From: "Tesla list" <tesla@xxxxxxxxxx> > To: <tesla@xxxxxxxxxx> > Sent: Sunday, May 01, 2005 2:09 PM > Subject: Oriental motor > > > > Original poster: "Christoph Bohr" <cb@xxxxxxxxxxxxxxx> > > > > Hello everyone. > > > > I want to build another small SRSG. > > I have a small oriental motor, just like the one > > Terry Blake used in his 12BPS gap. > > http://www.tb3.com/tesla/sparkgaps/1800srsg/1800srsg.html > > I just have the 220V version as far as I can see. > > I made a small 11cm disk with 4 spinning electrodes > > traveling on a 9cm diameter. > > I attached a white strip to the disk an checked for > > sync operation but the only flourescent light I have is > > a streetlamp in front of my window... just too weak. > > TV seems not to be too stable to be used and computer > > monitor just won't accept 50 or 100Hz as rep frequency. > > > > However, my impression was, that the motor locks into > > different positions each time I turn it on. Looks to me > > as if there are 8 possible positions, but this might be > > a wrong ebservation due to the very limited light... > > > > Or am I messing things up? I think there might be several > > possible positions in which the electrodes would still align > > properly.... > > Maybe someone can help here... > > > > Thanks in advance > > > > Christoph Bohr > > > > > >