Sync motor question

• To: tesla-at-pupman-dot-com
• Subject: Sync motor question
• From: Gavin Hubbard <ghub005-at-xtra.co.nz> (by way of Terry Fritz <twftesla-at-uswest-dot-net>)
• Date: Thu, 03 Jun 1999 16:47:59 -0600
• Approved: twftesla-at-uswest-dot-net
• Delivered-To: fixup-tesla-at-pupman-dot-com-at-fixme

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 

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