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Micro low rpm/stepper motors

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Altanore

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Anyone know where I could find very small low RPM motors or very small stepper motors?

The only perfect ones I found were from companies that do distribution only.

Thanks!
 
Anyone know where I could find very small low RPM motors or very small stepper motors?

The only perfect ones I found were from companies that do distribution only.

Thanks!

It would help if you could define what you mean by "very small" and "low RPM". Your hoped-for dimensions and speeds would be good. :)


Torben
 
Hi HarveyH42:
Ican't make the G14197 motor to work. I,m new on this, can you provide your schematics? I will really apreciate your help.
Please reply to: usache@yahoo.com

Gracias!
 
Can be used as a turbine/generator?

Also it is a permanant magnet motor?
It is a motor and does not include a turbine.

If you do mount a suitable wind turbine or fan to it, you probably could light a few LEDs in a high wind.

It is not a DC motor. It requires circuitry to run. Read carefully at the Goldmine website for suggested circuits.
 
Altanore, a good place for small steppers is DVD/CD and old floppy drives. The motor that drives the pickup assembly back and forth is a stepper, very small.
 
Altanore, a good place for small steppers is DVD/CD and old floppy drives. The motor that drives the pickup assembly back and forth is a stepper, very small.

To clarify, you get steppers in old floppy drives, usually uni-polar in 5.25 inch ones, and bi-polar (and mechanically not very useful) in 3.5 inch ones.

You don't get steppers in DVD drives, CD drives, or HDD's - steppers would be far too slow, and unable to track the fine data.
 
HDD's probably not, but the motors that drive the average CD/DVD optical head are small steppers, I've taken several dozen apart.
 
HDD's probably not, but the motors that drive the average CD/DVD optical head are small steppers, I've taken several dozen apart.

I've taken various ones apart, and never seen a stepper in one - has anyone else?.

A stepper isn't very suitable for that use, DC motors are used in every one I've ever seen, and the VERY oldest CD Players even used linear motors for the job - but that didn't last long, much too expensive.

EDIT: - just had a thought, are you sure you're not been confused by brushless DC motors?.
 
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I Google CD/DVD drives and find many references to steppers in them. Why aren't they accurate enough? Feeding a stepper from a decent sine wave source and they're smooth as glass. I'm really pretty sure they're steppers. I don't think I have any floating around right now but I might have a junk CD floating around I can scrap to find out. Should only take a few seconds with a multimeter to figure out if it's DC brushless or a stepper. I could be mistaken though, I never noticed any feedback from the brushless motors though how would you accuratly control their position, I don't recall seeing encoders anywhere, but I usually just gut them for the spindle motors.
 
I Google CD/DVD drives and find many references to steppers in them. Why aren't they accurate enough? Feeding a stepper from a decent sine wave source and they're smooth as glass.

A stepper moves in a series of discrete steps, no matter what you feed it, you certainly couldn't call then 'as smooth as glass'.

I'm really pretty sure they're steppers. I don't think I have any floating around right now but I might have a junk CD floating around I can scrap to find out. Should only take a few seconds with a multimeter to figure out if it's DC brushless or a stepper.

You don't need a meter (and I don't see how that would tell the difference anyway?), just rotate the motor with your fingers, a stepper will go round in a series of distinct steps, a brushless motor will go round smoothly.

I could be mistaken though, I never noticed any feedback from the brushless motors though how would you accuratly control their position, I don't recall seeing encoders anywhere, but I usually just gut them for the spindle motors.

There is no encoder, and no need for one, it's positioned by feedback from the actual disk from the laser assembly.
 
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