sync motors

• To: tesla-at-pupman-dot-com
• Subject: sync motors
• From: Gary Lau 24-Apr-1999 0914 <lau-at-hdecad.ENET.dec-dot-com> (by way of Terry Fritz <twf-at-verinet-dot-com>)
• Date: Sat, 24 Apr 1999 17:10:07 -0600
• Approved: twf-at-verinet-dot-com

>Original Poster: "Reinhard Walter Buchner" <rw.buchner-at-verbund-dot-net>=20
>
>Hi All,
>
>I just wanted to give you an update on my RSG. I finally found
>the time to start construction on it (which is ONE of the reasons
>why I am "on and off" the list at the moment).  Anyway......

<SNIP>

>After machining the 4 flats to measured specs and exactly 90=B0 apart, I
>polished the shaft at both ends with 2000 grit sandpaper to remove minor
>blemishes. Next on the list was a thorough cleaning of the rotor. Then I
>reassembled the motor.

<SNIP>

>Having heard from a few coilers (Gary Lau being one of them),
>that induction motors, modified this way, might not always start
>up in every armature position, I turned the rotor in 10=B0
>incrediments and applied power. It started up every time.
>
>Gary:
>Are you using a capacitor start motor or a centrifugal
>switch start-up unit? Maybe cap start motors don=B4t
>apply enough juice to the starting windings on modified motors
>(this is the only difference I can think of) with the original cap.
>
>Coiler greets from germany,
>Reinhard

I'm not real familiar with motor terminology.  My modified motor has an
AC cap going to a 3rd lead, but there's no sort of starting relay or
centrifugal switch.  The motor that I will ultimately use is a 3600RPM
sync unit removed from a Teletype machine.  This unit has a kind of
starting relay that apparently switched in (or out?) the cap at startup.
Perhaps this is what was needed for my modified fussy-startup unit.

Regards, Gary Lau
Waltham, MA USA

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