RE: Sync motor question

Hello List

What is the current wisdom on salient pole motor powered RSG's?

I understood John has shown no real advantage exists in the synchronous
system over say a normal fully controlled variable speed rotary. And that
this is based on actual tests with working coil systems, where a similar
non-synchronous gap is swapped out after the synchronous gap is run.  

Thanks in advance for your help,

Gavin Hubbard

At 09:53 PM 6/4/99 -0600, you wrote:
>Original Poster: "Basura, Brian" <brian.basura-at-unistudios-dot-com> 
>Can't answer you're question but remember you not only need a synchronous
>motor but it needs to be salient-pole.
>Brian D. Basura
>-----Original Message-----
>From: Tesla List [mailto:tesla-at-pupman-dot-com]
>Sent: Thursday, June 03, 1999 3:48 PM
>To: tesla-at-pupman-dot-com
>Subject: Sync motor question
>Original Poster: Gavin Hubbard <ghub005-at-xtra.co.nz> 
>Hello List
>I am building a RSG for a 5kVA TC.
>I have found a good 50Hz sync motor (single phase) in a second-hand parts
>outfit. The motor label reads "Dual speed hysteresis motor" and
>"1500rpm/3000rpm". The motor has 3 leads and a small circuit board
>containing a relay and motor cap etc. The quoted power is 1/14Hp and 1/7Hp
>depending on motor speed. 
>I know a little about the insides of induction motors, but I have never
>seen or heard about dual speed designs. Could someone explain how these
>motors operate? I am having trouble imagining the internal geometry.
>Thanks in advance for your help,
>Gavin Hubbard