Re: variable leslie speed with variable resistor

["A. B. Bonds" <ab@vuse.vanderbilt.edu>]

In <9607011709.AA17601@eldec.com>, Frank Grabner wrote:
>
>With all due respect, Mr. Bond has misled you a bit.  The only synchronous 
>motor used in the world of Hammond is the tone generator run motor that 
>synchronizes itself to the line frequency.  The Leslie motors are 
>induction motors who care only about an AC source and a voltage.  

Whoa, there, hoss.  The clock motor in the tone generator is a
hysteresis synchronous motor.  As pointed out, this must lock at
line frequency or it doesn't go.  The Leslie motors, at least in mine,
are a 4-pole General Industries type and a two-pole kinda generic 
shaded pole unit.  While there is some slip (depending on shaft
loading) they are formally classed as synchronous (from a pedagogical
standpoint) because the rotational speed (for 60 Hz, 1750-1800 rpm) is
_primarily_ determined by the line frequency.  In any event, when they
are run on 50 Hz they'll be slower (1450-1500 rpm).

                        A. B. Bonds