EEVblog Electronics Community Forum
Electronics => Beginners => Topic started by: THATguy on April 21, 2017, 04:15:53 am
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I have two motors from a CD-ROM drive. One has 4 wires, the other 11 wires.
Are these motors DC?
I can put the drive back together to test if necessary, though I'll need some advice on which wires to test.
I wish to make X & Y drive rails for a mini CNC drill. So the first smaller motor can already do this job.
The second motor I wish to use to get different rotation degrees. It does not need to be fast, I could easily replace this 11 wire motor with a simple DC fan motor if you think that would be less hassle?
These motors do not appear to show any voltage ratings on them.
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The motors that move the head in an optical (or floppy) drive are typically small stepper motors. There are hundreds of references how to drive small stepper motors by applying a voltage (typically 5V) to different windings in sequence.
The spindle motors of floppy, optical, and hard drives are typically multi-pole "DC-brushless" motors. Again, they are actuated by applying power sequentially to the various windings. There are special chips designed specifically to drive those kinds of multi-pole motors. They typically don't work very well at low speeds. They are optimized for smooth operation at a few hundred RPM.
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The first one looks like a stepper motor and the second, a brushless motor, as mentioned above. They both need different, driver circuitry and won't work directly of a DC supply.