Re: LED Dim brighten depending on rotational speed...
Quote:
Originally Posted by
Helix666
In a CD drive, the motors are not brushless.
(Just thought I'd let you know ;) )
Are you sure? I had a DVD drive that was apart and I could have sworn it had more than two wires going to it (a good indication that it could be brushless). I'll check on this later today. That fact that old CD/DVD drives with working motors are routinely taken apart to grab their brushless motors in model aircraft would lead me to assume that there is a good chance it is a brushless motor.
Re: LED Dim brighten depending on rotational speed...
I always thought that the spinning motor was brushless and the head movement motor was a stepper.
Re: LED Dim brighten depending on rotational speed...
That's more or less what I've seen. The motor driving the disk(s) is usually brushless, the "seeking" ones (move the reading head) are typically brushed motors (for removable disks, hard drives have their own coil/magnet thing).
Re: LED Dim brighten depending on rotational speed...
Well, in all the ones I've dismantled, both the motor driving the disc and the one moving the laser have brushes.
Although I can check a slightly more modern one. bear with me.
EDIT: hm, seems I was wrong. The newer CD drives do have stepper motors.