SRSG motor anomoly

• To: tesla-at-pupman-dot-com
• Subject: SRSG motor anomoly
• From: "Mark Broker" <broker-at-uwplatt.edu> (by way of Terry Fritz <twftesla-at-uswest-dot-net>)
• Date: Tue, 21 Mar 2000 07:55:54 -0700
• Approved: twftesla-at-uswest-dot-net
• Delivered-To: fixup-tesla-at-pupman-dot-com-at-fixme

Hey,

I finished machining 4 flats into the armature of a 1725 RPM 1/4 HP (or
something close) motor recently.  Today, I attached my G-LE rotor (no
electrodes yet :-(  )  to the motor and fired it up.  Ran pretty smooth
after balancing.  I grabbed an old stroboscope and clocked it at 1800RPM!
I was happy, despite there being no way with this scope to test for rotor
position vs. the AC cycle.

Then, I applied a little load to the rotor by gently pressing on it with my
hand.  The rotor position rotated about 10 degrees, then a full 90 degrees
(to the next pole).  It took surprisingly little pressure to cause this.  I
was wondering if I need to grind a little more off the armature?  I
machined 4 flats .675" across, which is the distance between the two "dead"
poles in the winding.  That is according to the directions I found on
Terry's site.  Is it possible that the motor is crap?  It was replaced in a
furnace.

Thanks

Mark B.

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