Re: Oriental motor

["Tesla list" <tesla@xxxxxxxxxx>]

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
>  >
>  >
>
>