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Re: Teletype motor (fwd)
Original poster: List moderator <mod1@xxxxxxxxxx>
---------- Forwarded message ----------
Date: Tue, 15 May 2007 08:31:03 EDT
Subject: Re: Teletype motor (fwd)
In a message dated 5/15/07 8:21:49 A.M. Eastern Daylight Time,
>Are you sure then that it is a hysteresis motor? It sounds to me
>like it is *not* a hysteresis motor. A true hysteresis motor will lock
>into random phases, not phases that are 90 degrees separated.
>An 1800rpm motor that locks at only 90 degree positions is a typical
>pole or reaction type sync motor.
>I realize that folks often say that a salient pole or reaction motor
>always locks up in the same phase position. This however is not
>true. What is meant is that the motor always locks into a correct
>phase position. For an 1800 rpm motor, there are 4 correct phase
>positions, and for a 3600 rpm motor there are 2 correct phase positions.
>By *correct*, I mean correct for use in synchronous spark gaps
>for Tesla coil use.
Thanks for the clarification, John!
At least I know for certain now what it *does*, even if I don't know
what to call it! :)
This subtlety could actually be significant to some designs with
asymmetric electrode spacing.
>It sounds like you did a good job selecting your cap value for the
phase shifter circuit.
Thank you for inventing it, and thanks for your help troubleshooting it!
Center for the Advanced Study of Ballistic Improbabilities
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