Re: variable leslie speed with variable resistor

["Frank Grabner" <fgrabner@eldec.com>]

> >Not much of an electrician.  The Leslies use synchronous motors, two
> >pole for slow and four pole for fast.  Their speed is determined by
> >the power line frequency.
> Snip....
> >                A. B. Bonds
> 
> 
> Does this mean the speed is different here (240V 50Hz)? I guess models for
> this market would have different belts to compensate? I know the Hz is a
> reason for NOT importing a 60Hz Hammond - didn't know it could work against
> a Leslie also...
> 
> Steve Blau
> blaumills@healey.com.au
> 

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.  The 
motor speed is essentially fixed though load dependent.  They're 
similar to the Hammond starter motor which has a lot of start-up torque 
but can run at slower speeds if loaded.  As you know, they start off slow 
and "wind-up" to speed.  A synchronous motor must be at speed to sync 
with the line frequency (properly).  All other things being equal, a 60Hz 
induction motor on a 50 Hz line will run 16% slower.   I think that's 
right.
 
Frank Grabner
Fgrabner@ELDEC.COM