RE: Sync motor question

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