Re: [TCML] SRSG Rotor Mods difficulty

[austin feathers <kartkid1@xxxxxxxxx>]

>From what little experience I have, I'd say that larger flats would provide
more intense polar flux in the rotor, and may make it easier for a higher
speed motor to lock, operating at one rotation per cycle. As stated in the
article you site, this will reduce the amount of torque the motor will
provide, and may heat it up a bit. Nothing I'd worry about too much unless
it starts smoking...

As for the "dead" pole, the author of the article seems to have utilized a
motor in which the layout of the windings is very clear. If you can't
identify the dead pole or the startup windings (nither could I, and I used
practically the same motor), I wouldnt worry about it. He seems to have
pointed it out to describe the theory of operation and nothing more.
On Sat, Aug 8, 2009 at 1:47 PM, Phil Tuck (hvtesla) <phil@xxxxxxxxxxx>wrote:

> Hello.
>
>
>
> Having successfully  machined a 1500rpm motor in the past, I now wish to do
> a (UK 50Hz 240v) 3000rpm one for my SRSG.
>
>
>
> Previously, with the 1500rpm and based on advice from this group, I
> measured
> the rotor diameter and used one quarter of the measurement as the width of
> the machined flat. Like  this:
> http://www.hvtesla.com/images/tesla%20coil%20modding_motor.jpg
>
> Yesterday I machined a 3000rpm bench grinder using the 0.25 formula and the
> motor just hunted afterwards without reaching a constant speed. Increasing
> the input to 270v did not help either. This motor was poor quality anyway
> so
> has now been discarded for other uses.
>
>
>
> I have since been advised however that the 3000rpm motors do not respond so
> well to machining as the 1500rpm, and may need more material removed.
>
> Unfortunately I am never able to correctly identify the 'dead' pole as
> illustrated  at http://evolve000.4hv.org/tesla/tc2srsg.html My motors
> always
> seem to differ to this.
>
>
>
>
>
> I have now acquired a second 3000rpm motor (bench grinder)  which is my
> last
> attempt for a while. This rotor is 2.128 inches diameter, the motor  itself
> being rated at 250Watts (1/5 HP maybe??)
>
> These are the windings of my second motor  that I wish to modify, in
> close-up:
>
> http://www.hvtesla.com/temp_images/DSCF0680.JPG
>
> http://www.hvtesla.com/temp_images/DSCF0682.JPG
>
> http://www.hvtesla.com/temp_images/DSCF0686.JPG
>
> http://www.hvtesla.com/temp_images/DSCF0687.JPG
>
>
>
> So any thoughts, do I still go for the 0.25 * diameter, or more, or even
> less? And have other people found the 3000rpm motors to be a bit trickier
>
>
>
>
>
>
>
> Phil
>
>
>
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>



-- 
^ Thats what she said. ^
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