Maker Pro
Maker Pro

CDROM Spindle Stepper motor

F

fritz

Jan 1, 1970
0
Phil Allison said:
"fritz"


** You clearly are a narcissistic, nit picking idiot who cannot take being
corrected.

ROTFLMFHO !!!
You are obviously describing yourself there, Philthy !!!!!

Brushless DC motors and stepper motors are the NOT the SAME - each type
is suited to particular applications and they have very different
characteristics.

They both have a multi-pole rotor and several stator coils, both will move
the rotor to a fixed position when a coil is energised by DC. They have far
more in common than you realise.


QUOTES from YOUR link above :
'Brushless DC electric motor......'
'Two subtypes exist:
The stepper motor type may have more poles on the stator.
The reluctance motor. '
 
P

Phil Allison

Jan 1, 1970
0
"fritz the 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




....... Phil
 
P

Phil Allison

Jan 1, 1970
0
" fritz the 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


Then FOAD.


....... Phil
 
F

fritz

Jan 1, 1970
0
Phil Allison said:
"fritz the 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


QUOTES from YOUR link above :
'Brushless DC electric motor......'
'Two subtypes exist:
The stepper motor type may have more poles on the stator.
The reluctance motor. '
 
F

fritz

Jan 1, 1970
0
Phil Allison said:
" fritz the 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
QUOTES from YOUR link above :
'Brushless DC electric motor......'
'Two subtypes exist:
The stepper motor type may have more poles on the stator.
The reluctance motor. '
 
P

Phil Allison

Jan 1, 1970
0
" 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





....... Phil
 
P

Phil Allison

Jan 1, 1970
0
" 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



**** off and Die - you MORON !!



....... Phil
 
F

fritz

Jan 1, 1970
0
geoff said:
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......

geoff wrote...
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.

So what has the tracking of the 'groove' (sic) got to do with the spindle motor,
which always was the obvious subject ?
 
F

fritz

Jan 1, 1970
0
Phil Allison said:
" 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



**** off and Die - you MORON !!

YOU really are the pathetic little nit-picker that you imagine in everyone else.
Your abusive posts are clear evidence that you have serious mental problems.
The evidence is clear from your previous posts, anyone can see your bad
behaviour by simply searching Google Groups aus-electronics.
You should be ashamed of yourself.
 
F

fritz

Jan 1, 1970
0
Phil Allison said:
" 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.
Your abusive posts are clear evidence that you have serious mental problems.
The evidence is clear from your previous posts, anyone can see your bad
behaviour by simply searching Google Groups aus-electronics.
You should be ashamed of yourself.
 
P

Phil Allison

Jan 1, 1970
0
" 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

**** off and Die - you MORON !!





....... Phil
 
P

Phil Allison

Jan 1, 1970
0
" 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


**** off and Die - you MORON !!






....... Phil
 
P

Phil Allison

Jan 1, 1970
0
" 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


**** off and Die - you MORON !!





....... Phil
 
F

fritz

Jan 1, 1970
0
Phil Allison said:
" 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


**** off and Die - you MORON !!





...... Phil

YOU really are the pathetic little nit-picker that you imagine in everyone else.
Your abusive posts are clear evidence that you have serious mental problems.
The evidence is clear from your previous posts, anyone can see your bad
behaviour by simply searching Google Groups aus-electronics.
You should be ashamed of yourself.
 
F

fritz

Jan 1, 1970
0
Phil Allison said:
" 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

**** off and Die - you MORON !!





...... Phil

YOU really are the pathetic little nit-picker that you imagine in everyone else.
Your abusive posts are clear evidence that you have serious mental problems.
The evidence is clear from your previous posts, anyone can see your bad
behaviour by simply searching Google Groups aus-electronics.
You should be ashamed of yourself.
 
F

fritz

Jan 1, 1970
0
Phil Allison said:
" 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


**** off and Die - you MORON !!






...... Phil

YOU really are the pathetic little nit-picker that you imagine in everyone else.
Your abusive posts are clear evidence that you have serious mental problems.
The evidence is clear from your previous posts, anyone can see your bad
behaviour by simply searching Google Groups aus-electronics.
You should be ashamed of yourself.
 
C

Clint Sharp

Jan 1, 1970
0
geoff said:
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,
they all seem to manage fine.
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
stepper?
Could 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,
I'm also fairly sure I know what a brushless DC motor is and how that
works. Where I'm unsure is in what the difference between the two types
is because they both operate in the same way, albeit one has far less
poles than the other (which may be the difference!).
They 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
lies. AFAIK the type of motor you think is exclusively used in CD and
CD-ROM devices is a multipole brushed DC motor but I could be wrong,
please enlighten us.
FWIW, 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.
 
C

Clint Sharp

Jan 1, 1970
0
fritz said:
geoff wrote...
Easily, the multiple CD-DVD-ROM writers and readers in my PCs are fine
examples.Umm, yes, as far as I know they are. So is the sled, so are the focus
coils on the lens assembly. What, exactly does that have to do with the
type of motor?
So 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
stepper to position the sled. I am still no more enlightened as to what
the difference between a brushless DC motor and a stepper is though.
Apart from a 'traditional' stepper motor having many more poles I see no
differences in terms of operation.

I think he is generally correct in stating that domestic CD players
don't use stepper or brushless motors for the spindle and laser sled but
almost all the CD-ROM/DVD-ROM drives I have ever disassembled do. Indeed
if he were to do a little research on CD/DVd drive spindle motors he
will find a *huge* amount of information about their operation and
drive.

Another mistake Geoff makes is that he assumes that a stepper has to
have jerky motion, using phase drive on a stepper you can achieve very
smooth motion and the rotating mass of the driven parts makes a nice
flywheel. He appears not to understand how a worm driven sled can have a
much higher resolution than the discrete steps would suggest.
 
C

Clint Sharp

Jan 1, 1970
0
Clint Sharp said:
FWIW, 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
drive today to find three brushed DC motors, one for the spindle, one
for tracking and one to open the tray.
 
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