Re: [TCML] SRSG Rotor Mods difficulty

[austin feathers <kartkid1@xxxxxxxxx>]

I might also add that only two flats need be milled for operation at one
rotation per cycle!

On Sun, Aug 9, 2009 at 3:48 AM, austin feathers <kartkid1@xxxxxxxxx> wrote:

> 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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>> Tesla@xxxxxxxxxxxxxx
>> http://www.pupman.com/mailman/listinfo/tesla
>>
>
>
>
>
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