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Re: [TCML] NST's and ARSG's
My rotor weighs nothing, it's made from a polyethelene cutting board.
I have eight 1" brass bolts with acorn nuts. I just don't have enough
load for the speed to vary with voltage. The gap has very poor
quenching for a rotary gap. If I run the coil for any more than than
a minute I have to break out the shop vac and turn it into a rotary
sucker gap. At any rate, I'm getting rid of the gap for a
synchronous, or I have a vacuum motor for a sucker gap.
On Wed, Jun 11, 2008 at 7:30 PM, <FutureT@xxxxxxx> wrote:
> 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.
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