Are these small enough? Bipolar stepper, pretty good torque for it's size. I didn't use their circuit, just something quick and dirty, wasn't real smooth, but probably my fault... Worth a buck a piece to try. Was going to use them on a tiny robot, never got around to it.
Are these small enough? Bipolar stepper, pretty good torque for it's size. I didn't use their circuit, just something quick and dirty, wasn't real smooth, but probably my fault... Worth a buck a piece to try. Was going to use them on a tiny robot, never got around to it.
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
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.
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?.
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.