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Re: Grinding flats into motor to make syncronous help!

Original poster: striker754@xxxxxxxxxxxxx

I did some measurements, using the rotor diameter to flat size. Your ratio is about 3.8 with a 3.22 diameter rotor, and .85 flat size. My rotor is about 3.5 inch diameter. With a 3.8 ratio, that works out to 0.92 inch wide flat.

0.944" is the distance from outside to outside on those poles where the blue d is marked. http://theflyingbullet.com/motor/IMG_1769.JPG Basically the outside to outside distance of 3 of those poles.

Center to center distance over 3 of those poles is about 0.7" or so.

Should I do the 0.92" flats?

Original poster: Vardan <vardan01@xxxxxxxxxxxxxxxxxxxxxxx>

Hi Aron,

See the notes here too:




At 12:55 PM 5/28/2006, you wrote:
>I'm trying to convert this motor to syncronous operation. I am not
>sure how big to cut the flats. Picture 3 in terrys zip file shows
>the flat going to the edge of the next pole. Yet the motors 2
>picture in the same zip file says measure to the middle of the next
>pole. What should I do?
>Here is a picture of the motor:
>Is the black area the dead pole? The red ones dont have direct run
>windings around them, but they are totally encased in the windings,
>which is what I think matters correct? The black one is inbetween
>the 2 loops of windings which is what I think I want...
>Is that the correct distance for the flat to be cut? Half way
>between the next active pole? The armature is ~ 3.5 in diameter.
>Thanks guys
>PS: Terry, can you email me your phone number, maybe we can get
>together sometime again.