[time-nuts] OXCO Spurious Output at Line Frequencies
bill.iaxs at pobox.com
Tue Jul 12 23:08:14 EDT 2016
Just to clarify - AC motors are either synchronous or induction.
Induction motors must slip away from line frequency to develop the
magnetic field they need to carry a load. The name plate speed is for
rated load and the number of magnetic poles in the rotor. A 2 pole motor
spins near line frequency - 4 poles at half. 1750 is for a 4 pole motor.
And so on ...
From: Hal Murray
Sent: Tuesday, July 12, 2016 7:24 PM
Most of the medium sized motors run at slightly below line rate, and
often at half of line rate. I'm thinking of the classic squirrel cage
induction motor vs a synchronous motor. A quick google search found
1725 and 1750 RPM.
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