Re: [CAD_CAM_EDM_DRO] Minertia Motors

On Tue, 2 Sep 2003 23:54:54 -0600, you wrote:

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>> .
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>> Thanks. I bought 10 of these little things, and 8 appear to be in
>> good shape, the others rattle (might be something to do with the
>> encoder or bad brushes....)
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>I have some that have loose brushes maybe repairable. I have about 50 left
>maybe and I haven't gone through all of them yet.
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>>
>> I think that an Atmel 90S2313 running as a
>> phase lock loop based on the encoder, its internal timebase and the 16
>> bit counter should give me the possible design ratios, especially
>> since it is also designed to do PWM.
>> Should be an interesting project.
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>Let me know how this comes out I would be interested in something simular.

No problem. I'll probably be using a single chip bipolar motor
driver, which will be well within the ratings of the motor (I assume),
most that I will run it on is 12 to 18 volts.

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>> Will be running off 12 volts at the most, although I can have 18 volts
>> available at a higher drain from the battery (old compaq mobile
>> adaptor... 12 to 18 volts....)
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>I think this will work ok as they seem to like low voltages.

I have a larger minertia motor, and it has the same kind of "happy at
low voltages" kind of behavior.

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>> That 80 IPM runs out to what RPM or at what voltage supply?
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>I don't know the exact RPM but it is 20khz pulse from the computer at 24v. I
>haven't maxed it out yet maybe I will do that tonight.
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> The
>> company says that they run well up to 24 volts, and I will attest that
>> the torque at 3 volts is respectable.
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>The torque seems real good to run a small mill or anything else especially
>at 24v.

Now I would wonder if that is enough torque to really do the job.
I've got steppers that are far larger, and with the number of motors I
have, I'll be dedicating perhaps four to a telescope project, perhaps
6, hard to say. I'll have a few more that may be used for mills...
hmmm... perhaps I need to buy some more...

Anybody have any idea of how much torque we might expect out of these
motors? If I assume at least 4:1 gearing to a drive, it might just
work.

Harvey

>Derek