Re: [TCML] NST's and ARSG's

[FutureT@xxxxxxx]

In a message dated 6/11/2008 7:21:26 P.M. US Eastern Standard Time,  
pslawinski@xxxxxxxxx writes:

>This is what I'm describing.

>Sadly, my motor's speed  does not vary at all with voltage, unless the
>voltage is so low that  the rotor will not spin.
--------


I assume then that you tried varying the speed using a variac?  If  the
speed doesn't vary at all, then you must have a rather powerful  motor
relative to the rotor diameter.  Such a situation makes the  speed
relatively unresponsive to voltage changes.  Although induction  motor
speed is considered to be rather independent of voltage, a heavily
loaded motor will react to a change in voltage with a change in  speed.
 
It can be helpful also to lower the voltage after getting the motor  to 
spin up.  A lower voltage which can keep the motor spinning,  may
be too low to start the motor.  It's best to start the motor at full  voltage,
then lower it carefully, while monitoring the coil's operation for 
elimination of the unwanted surging, pulsing effect.
 
If none of this works, then you need a variable speed motor, or  change
the number of electrodes, or use a heavier rotor with more air  resistance,
or use a weaker induction motor, or use a special motor controller,  or
use a belt drive with pulleys, etc.
 
Cheers,
John








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