Synchronous Induction Motor

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Stephen Mathieson" <s.mathieson-at-charter-dot-net> 

That is exactly what I have though I was not aware of this resynch. problem.
I chose not to use this motor as I have taken another approach which I feel
may be of interest to others.

I purchased a 3 phase 1 1/2 HP 3450 RPM induction motor and am driving it
with a variable speed AC drive. (These are usually available on e-bay for
reasonable prices.) Most drives will take a single phase input and create 3
phase output at up to 120Hz. I am planning on using feedback from my rotor
to close a PLL driving the speed control input. Ideally I will be able to
run the gap in synchronous mode and control the firing angle or open the
loop and run it async. up to 6900 RPM.

It is still under construction and I will post my results. I also welcome
comments from any others who may have tried this.

Stephen A. Mathieson

-----Original Message-----
From: Tesla list [mailto:tesla-at-pupman-dot-com]
Sent: Thursday, April 15, 2004 5:24 PM
To: tesla-at-pupman-dot-com
Subject: Re: Sync Motor Wanted

Original poster: "Eastern Voltage Research Corporation"
<dhmccauley-at-easternvoltageresearch-dot-com>

No.  If they are the same motors I purchased from Dr. Resonance over a year
ago, they are actually Hysteresis type
synchronous motors.  They have to be re-tuned during every run and will not
resynch to the same position every time.

Dan


  > I would think that if he is offering them for Tesla coil use that they
would
  > be salient pole and powerful enough for a SRSG... But 43$ is a tad more
then
  > I wanted to pay.   No one has any used ones?
  >
  > Regards - Jim Mitchell
  > ----- Original Message -----
  > From: "Tesla list" <tesla-at-pupman-dot-com>
  > To: <tesla-at-pupman-dot-com>
  > Sent: Thursday, April 15, 2004 12:20 AM
  > Subject: Re: Sync Motor Wanted
  >
  >
  >  > Original poster: Terry Fritz <teslalist-at-twfpowerelectronics-dot-com>
  >  >
  >  > Hi DC,
  >  >
  >  > Your's may not be salient pole though?  Also might not be very
powerful
  >  > depending on the rotor size?
  >  >
  >  > Cheers,
  >  >
  >  >          Terry
  >  >
  >  > At 09:55 PM 4/14/2004, you wrote:
  >  >
  >  > >Yes, I have some in stock.  1800 RPM at 120 VAC.  $35 plus $8.50
  > shipping.
  >  > >
  >  > >Dr. Resonance
  >  > >
  >  > >Resonance Research Corporation
  >  > >E11870 Shadylane Rd.
  >  > >Baraboo   WI   53913
  >  > >----- Original Message -----
  >  > >From: "Tesla list" <tesla-at-pupman-dot-com>
  >  > >To: <tesla-at-pupman-dot-com>
  >  > >Sent: Wednesday, April 14, 2004 5:37 PM
  >  > >Subject: Sync Motor Wanted
  >  > >
  >  > >
  >  > > > Original poster: "Jim Mitchell" <electrontube-at-sbcglobal-dot-net>
  >  > > >
  >  > > > Hello list,
  >  > > >
  >  > > > Does anyone have a Sync. motor for sale suitable for a SRSG?  I
didn't
  >  > >have
  >  > > > any luck grinding flats into my motor,  it just searches for sync
but
  > wont
  >  > > > lock on.
  >  > > >
  >  > > > Regards - Jim Mitchell
  >  > > >
  >  > > >
  >  > > >
  >  >
  >  >
  >
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