Re: [CAD_CAM_EDM_DRO] Simple DRO new idea

ok thanks
i think u have also tried to using stepper motor or stepper rooter magnet.


shabbir


At 10:46 PM 9/3/01 +0000, you wrote:0

>"M. SHABBIR" wrote:
>
>> hi
>> u can find ring magnet in back of audio speaker.
>>
>> shabbir
>>
>> At 02:26 PM 9/2/01 -0600, you wrote:
>> >Scott
>> >I am working on a very simple dro using a special purpose Hall effect

sensor

>> >and a simple up down counter connected to a 8 digit led. It would work as
>> >follows
>> >a linear magnet strip or a ring magnet with alternating north and south
>
>The ring shaped magnet it a speaker has one pole in the center, and one pole
>on the OD (some fold the design, so each face is a pole). This won't work
>as a magnetic encoder, since the poles don't move when it is rotated.
>A 2-pole motor with a ring magnet only has 2 poles for one revolution,
>so that may still not work well for your application. Floppy drive motors
>from the ones with the motor in the hub usually have more poles, and may
>have a tach ring that has many poles per rev. These are pretty large
>diameter, however.
>
>Jon
>
>
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