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Sorry - slip of the keyboard. The Denon, Sony, and NADs are not, of course,fritz wrote:
You don't understand what a spindle motor does, obviously.
It just spins the disk, it has nothing to do with the tracking of the
laser, which I
have already explained. The spindle motor has feedback to spin the CD
at
the right speed, usually with Hall effect sensors. The coarse
tracking is controlled
by a separate motor with position feedback, and fine tracking is
controlled with
a 'voice coil' suspension connected to the laser lens.
Dude, I think I know eactly what a spindle motor does - I fix Denon,
Sony, and Nad ones every week and have don for decades. Also DVD and
DVD/CD-ROM/RWs.
Maybe you just have a problem with expressing technical English clearly......fritz wrote:
You don't understand what a spindle motor does, obviously.
It just spins the disk, it has nothing to do with the tracking of the
laser, which I
have already explained. The spindle motor has feedback to spin the CD
at
the right speed, usually with Hall effect sensors. The coarse
tracking is controlled
by a separate motor with position feedback, and fine tracking is
controlled with
a 'voice coil' suspension connected to the laser lens.
Dude, I think I know eactly what a spindle motor does - I fix Denon, Sony,
and Nad ones every week and have don for decades. Also DVD and
DVD/CD-ROM/RWs.
So what has the tracking of the 'groove' (sic) got to do with the spindle motor,Are you sure ? How can a stepper motor, with it's "quantised' discrete
stepped positions track a continuous spiral groove ? My understanding is
that all CD spindle motors are servo-controlled , to enable accurate
tracking.
None of these contain stepper motors, and I can't see how any other CD
could, given the pusly buzzy motion that a stepper can only supply. I have
never seen a CD with a spindle motor or a sled motor, that is a stepper. I
have seen stepper motors in telex machines,printers, and iindustrial process
machines.
Stepper motors move one discrete finite 'step' (surprisingly ?) for each
discrete DC pulse that is sent to drive it. All CD motors I have ever seen
are driven by a continuous DC, the voltage of which is finely varied to
control the speed of the spindle, or the position of the sled.
Grateful you specify which make/model CD contains a stepper motor.
by DC. To get either type to spin requires a controller to drive the
coils
in the correct sequence. The main difference is the coil
terminations, steppers
bring out all coils separately while so-called 'DC brushless' motors
usually have
the coils connected in star or delta (for 3-phase types).
So now you are trying to fudg the distinction between stepper motors and the
type you really mean. OK, I concede the I can therefore never 'win'.....
geoff
YOU really are the pathetic little nit-picker that you imagine in everyone else." fritz the ASD fucked fuckhead "
** You clearly are a narcissistic, nit picking idiot who cannot take being
corrected.
Brushless DC motors and stepper motors are the NOT the SAME - each type
is suited to particular applications and they have very different
characteristics.
http://en.wikipedia.org/wiki/Brushless_DC_electric_motor
Fuck off and Die - you MORON !!
YOU really are the pathetic little nit-picker that you imagine in everyone else." fritz the ASD fucked fuckhead "
** You clearly are a narcissistic, nit picking idiot who cannot take being
corrected.
YOU really are the pathetic little nit-picker that you imagine in everyone else." fritz the ASD fucked fuckhead "
** You clearly are a narcissistic, nit picking idiot who cannot take being
corrected.
Brushless DC motors and stepper motors are the NOT the SAME - each type
is suited to particular applications and they have very different
characteristics.
http://en.wikipedia.org/wiki/Brushless_DC_electric_motor
Fuck off and Die - you MORON !!
...... Phil
YOU really are the pathetic little nit-picker that you imagine in everyone else." fritz the ASD fucked fuckhead "
** You clearly are a narcissistic, nit picking idiot who cannot take being
corrected.
Brushless DC motors and stepper motors are the NOT the SAME - each type
is suited to particular applications and they have very different
characteristics.
http://en.wikipedia.org/wiki/Brushless_DC_electric_motor
Fuck off and Die - you MORON !!
...... Phil
YOU really are the pathetic little nit-picker that you imagine in everyone else." fritz the ASD fucked fuckhead "
** You clearly are a narcissistic, nit picking idiot who cannot take being
corrected.
Brushless DC motors and stepper motors are the NOT the SAME - each type
is suited to particular applications and they have very different
characteristics.
http://en.wikipedia.org/wiki/Brushless_DC_electric_motor
Fuck off and Die - you MORON !!
...... Phil
they all seem to manage fine.Clint Sharp wrote:
In message <6Z-dna1E4eoSD7bVnZ2dnUVZ_hSdnZ2d@giganews.com>, geoff
geoff@nospam-paf.co.nz> writes
fritz wrote:
Why have you got 'steper motors' stuck in your 'brain' ?
CD players and CD-ROMs do NOT use stepper motors. None. Never.
Well, with respect Geoff, I have disassembled probably far too many
and an awful lot of them use a stepper to move the laser sled. As to
the definition of the spindle motor, I don't really see the difference
between a stepper and a brushless but I admit I'm not sure how you
define the two types to see the difference, maybe you can clarify
that?
Are you sure ? How can a stepper motor, with it's "quantised' discrete
stepped positions track a continuous spiral groove ?
Easily if the multiple CD/DVD-ROM drives I own are anything to go by,
stepper?My understanding is
that all CD spindle motors are servo-controlled , to enable accurate
tracking.
So what? Do you think you can't achieve high enough resolution with a
I'm also fairly sure I know what a brushless DC motor is and how thatCould it be that people are not aware of what stepper-motors are.
Well, I'm fairly sure I know what a stepper motor is and how it works,
lies. AFAIK the type of motor you think is exclusively used in CD andThey are
NOT the same as a multi-pole DC motor, as the OP seems to think, from his
description ...
OK, so define a multipole DC motor and let's see where the difference
long time is the one used to open and close the tray.geoff
FWIW, the only brushed DC motor I have seen in a CD-ROM drive for a very
examples.geoff wrote...
Are you sure ? How can a stepper motor, with it's "quantised' discrete
stepped positions track a continuous spiral groove ?
Easily, the multiple CD-DVD-ROM writers and readers in my PCs are fine
coils on the lens assembly. What, exactly does that have to do with theMy understanding is
that all CD spindle motors are servo-controlled , to enable accurate
tracking.
Umm, yes, as far as I know they are. So is the sled, so are the focus
stepper to position the sled. I am still no more enlightened as to whatSo what has the tracking of the 'groove' (sic) got to do with the
spindle motor,
which always was the obvious subject ?
I raised that subject I'm afraid, lots of CD/DVD-ROM drives use a
drive today to find three brushed DC motors, one for the spindle, oneFWIW, the only brushed DC motor I have seen in a CD-ROM drive for a
very long time is the one used to open and close the tray.
And having said that, I gutted a *very* old Toshiba XM-5401 SCSI CD-ROM