CDROM Spindle Stepper motor

[fritz]

Has anyone tried using a stepper motor from a CDROM ?

I have one, it was used to drive the spindle i.e. spin the disk
of a Sony CDROM.
It has 9 windings (coils) on the stator and 6 magnetic poles on the rotor.
(North poles only - 12 N+S in total)
The 9 stator windings are connected to only 3 terminals.

 

[Phil Allison]

"fritz"

Has anyone tried using a stepper motor from a CDROM ?

** They are all " brushless DC " motors.

I have one, it was used to drive the spindle i.e. spin the disk
of a Sony CDROM.
It has 9 windings (coils) on the stator and 6 magnetic poles on the rotor.
(North poles only - 12 N+S in total)
The 9 stator windings are connected to only 3 terminals.

** Google will supply you countless sites about how to modify and use a CR
rom motor in model aeroplanes.

The three wires go to a dedicated, variable frequency speed controller.



....... Phil

 

[Clint Sharp]

In message <g059au$6oh$02$1@news.t-online.com>, fritz
<fritz@address.com> writes

Has anyone tried using a stepper motor from a CDROM ?

I have one, it was used to drive the spindle i.e. spin the disk
of a Sony CDROM.
It has 9 windings (coils) on the stator and 6 magnetic poles on the rotor.
(North poles only - 12 N+S in total)
The 9 stator windings are connected to only 3 terminals.
You'll find a lot of information about controlling them in the RC aero

modelling groups, they modify them for flight. Other than that, look out
for hard disk motor control and brushless dc motor control.
--
Clint Sharp

 

[fritz]

Phil Allison <philallison@tpg.com.au> wrote in message news:68ndngF2se6l7U1@mid.individual.net...

"fritz"

Has anyone tried using a stepper motor from a CDROM ?

** They are all " brushless DC " motors.

The one I have is clearly a stepper motor. You could say all stepper motors
are 'brushless DC' motors if you think about it.....
You apply a current to the motor terminals and it moves to a fixed position.

I have one, it was used to drive the spindle i.e. spin the disk
of a Sony CDROM.
It has 9 windings (coils) on the stator and 6 magnetic poles on the rotor.
(North poles only - 12 N+S in total)
The 9 stator windings are connected to only 3 terminals.


** Google will supply you countless sites about how to modify and use a CR
rom motor in model aeroplanes.

...... Phil

I haven't had much luck in searching for such sites using Google. (including groups)
Perhaps you could post a few relevant URLs, I must be using the wrong
search terms

 

[fritz]

Clint Sharp <clint@clintsmc.demon.co.uk> wrote in message news:E+dOy4ZJ6rJIFwhd@clintsmc.demon.co.uk...

In message <g059au$6oh$02$1@news.t-online.com>, fritz
fritz@address.com> writes
Has anyone tried using a stepper motor from a CDROM ?

I have one, it was used to drive the spindle i.e. spin the disk
of a Sony CDROM.
It has 9 windings (coils) on the stator and 6 magnetic poles on the rotor.
(North poles only - 12 N+S in total)
The 9 stator windings are connected to only 3 terminals.
You'll find a lot of information about controlling them in the RC aero
modelling groups, they modify them for flight. Other than that, look out
for hard disk motor control and brushless dc motor control.





--
Clint Sharp

I haven't had much luck in searching for such sites using Google. (including groups)
Perhaps you could post a few relevant URLs, I must be using the wrong
search terms

 

[Phil Allison]

"fritz"

I haven't had much luck in searching for such sites using Google.
(including groups)
Perhaps you could post a few relevant URLs, I must be using the wrong
search terms

** Just use " cd rom motor " in Google.

Gets thousands of hits - the first page should keep you busy for hours.



..... Phil

 

[fritz]

Phil Allison <philallison@tpg.com.au> wrote in message news:68pevbF2t6ktmU1@mid.individual.net...

"fritz"


I haven't had much luck in searching for such sites using Google.
(including groups)
Perhaps you could post a few relevant URLs, I must be using the wrong
search terms


** Just use " cd rom motor " in Google.

Gets thousands of hits - the first page should keep you busy for hours.

Thanks for that.

 

[Clint Sharp]

In message <g07vsr$9rt$00$2@news.t-online.com>, fritz
<fritz@address.com> writes

I haven't had much luck in searching for such sites using Google.
(including groups)
Perhaps you could post a few relevant URLs, I must be using the wrong
search terms


cd rom motor rc were the search terms I used...

--
Clint Sharp

 

[geoff]

fritz wrote:

Has anyone tried using a stepper motor from a CDROM ?

I have one, it was used to drive the spindle i.e. spin the disk
of a Sony CDROM.
It has 9 windings (coils) on the stator and 6 magnetic poles on the
rotor. (North poles only - 12 N+S in total)
The 9 stator windings are connected to only 3 terminals.

Stepper motor ?!!!

How would you servo control a stepper motor to track a CD pre-groove ?

geoff

 

[fritz]

geoff <geoff@nospam-paf.co.nz> wrote in message news:m_mdnXICIObeXLXVnZ2dnUVZ_obinZ2d@giganews.com...

fritz wrote:
Has anyone tried using a stepper motor from a CDROM ?

I have one, it was used to drive the spindle i.e. spin the disk
of a Sony CDROM.
It has 9 windings (coils) on the stator and 6 magnetic poles on the
rotor. (North poles only - 12 N+S in total)
The 9 stator windings are connected to only 3 terminals.

Stepper motor ?!!!

How would you servo control a stepper motor to track a CD pre-groove ?

geoff

Look up 'spindle'. i.e. it spins the disk
The motor I was talking about isn't part of the laser groove tracking system at all.....

 

[fritz]

Clint Sharp <clint@clintsmc.demon.co.uk> wrote in message news:4adB74BFGJKIFwcP@clintsmc.demon.co.uk...

In message <g07vsr$9rt$00$2@news.t-online.com>, fritz
fritz@address.com> writes

I haven't had much luck in searching for such sites using Google.
(including groups)
Perhaps you could post a few relevant URLs, I must be using the wrong
search terms


cd rom motor rc were the search terms I used...

Thanks for the help.

--
Clint Sharp

 

[geoff]

fritz wrote:

geoff <geoff@nospam-paf.co.nz> wrote in message
news:m_mdnXICIObeXLXVnZ2dnUVZ_obinZ2d@giganews.com...
fritz wrote:
Has anyone tried using a stepper motor from a CDROM ?

I have one, it was used to drive the spindle i.e. spin the disk
of a Sony CDROM.
It has 9 windings (coils) on the stator and 6 magnetic poles on the
rotor. (North poles only - 12 N+S in total)
The 9 stator windings are connected to only 3 terminals.

Stepper motor ?!!!

How would you servo control a stepper motor to track a CD pre-groove
?

geoff

Look up 'spindle'. i.e. it spins the disk
The motor I was talking about isn't part of the laser groove tracking
system at all.....

A stepper motor spinning the spindle - that doesn't sound very smooth !

I think you'll find it is a conventional brushless DC motor - not a stepper
motor.

geoff

 

[Fun Tyme]

geoff wrote:

fritz wrote:
geoff <geoff@nospam-paf.co.nz> wrote in message
news:m_mdnXICIObeXLXVnZ2dnUVZ_obinZ2d@giganews.com...
fritz wrote:
Has anyone tried using a stepper motor from a CDROM ?

I have one, it was used to drive the spindle i.e. spin the disk
of a Sony CDROM.
It has 9 windings (coils) on the stator and 6 magnetic poles on the
rotor. (North poles only - 12 N+S in total)
The 9 stator windings are connected to only 3 terminals.
Stepper motor ?!!!

How would you servo control a stepper motor to track a CD pre-groove
?

geoff
Look up 'spindle'. i.e. it spins the disk
The motor I was talking about isn't part of the laser groove tracking
system at all.....

A stepper motor spinning the spindle - that doesn't sound very smooth !

I think you'll find it is a conventional brushless DC motor - not a stepper
motor.

geoff

The spindle motors I have replaced are 2-wire motors with brushes, it's
these brushes wearing out that causes motor failure. It's rare to find a
bearing failure as a fault condition.

 

[Phil Allison]

"Fun Tyme"

The spindle motors I have replaced are 2-wire motors with brushes,

** You replace the motors in CD-rom players ????

Bet ya don't.

it's these brushes wearing out that causes motor failure.

** Doubt you will find brush motors in a many CR-rom player / burner.

Specially not the ones that do 48 and 52 times speed.



....... Phil

 

[Bob Parker]

On 14/05/2008 09:37 geoff wrote:

A stepper motor spinning the spindle - that doesn't sound very smooth !

I think you'll find it is a conventional brushless DC motor - not a stepper
motor.

geoff

Strange - that's exactly what I was thinking too. I always had the
idea that the disc rotates at a very constant velocity, which stepping
motors don't do.

Bob

 

[Clint Sharp]

In message
<482a5e0d$0$22170$5a62ac22@per-qv1-newsreader-01.iinet.net.au>, Bob
Parker <bobp.deletethis@bluebottle.com> writes

On 14/05/2008 09:37 geoff wrote:
A stepper motor spinning the spindle - that doesn't sound very
smooth !
I think you'll find it is a conventional brushless DC motor - not a
stepper motor.
geoff

Strange - that's exactly what I was thinking too. I always had the
idea that the disc rotates at a very constant velocity, which stepping
motors don't do.
CD-ROM spindle motors are generally brushless hall effect sensor types

(at least all the ones I've seen recently are) but isn't that just a
variant of stepper motor? Not trying to be argumentative, I'm just not
sure where the lines are drawn.

Bob

--
Clint Sharp

 

[Fun Tyme]

Phil Allison wrote:

"Fun Tyme"

The spindle motors I have replaced are 2-wire motors with brushes,


** You replace the motors in CD-rom players ????

Bet ya don't.


it's these brushes wearing out that causes motor failure.


** Doubt you will find brush motors in a many CR-rom player / burner.

Specially not the ones that do 48 and 52 times speed.



...... Phil








You are correct of course, I meant CD players as in shitbox consumer

"HiFi". I didn't read properly - a combination of age, general stupidity
and drugs.
Now I will have to wreck a CD-ROM unit and find out what spins ...

 

[Phil Allison]

"Fun Tyme"

** Doubt you will find brush motors in a many CR-rom player / burner.

Specially not the ones that do 48 and 52 times speed.


You are correct of course, I meant CD players as in shitbox consumer
"HiFi". I didn't read properly - a combination of age, general stupidity
and drugs.

** LOL !!

Now I will have to wreck a CD-ROM unit and find out what spins ...

** Just had a peek at old one of mine, stored away because it still works
and I never chuck out a " goer" .

The thing that " spins " look far to simple to even work.

Bit like a small jet turbine - I fancy.



.... rgds, Phil

 

[Phil Allison]

"Phil Allison"


** Typo....

The thing that " spins " look far too simple to even work.

...... Phil

 

[geoff]

Clint Sharp wrote:

In message
482a5e0d$0$22170$5a62ac22@per-qv1-newsreader-01.iinet.net.au>, Bob
Parker <bobp.deletethis@bluebottle.com> writes
On 14/05/2008 09:37 geoff wrote:
A stepper motor spinning the spindle - that doesn't sound very
smooth !
I think you'll find it is a conventional brushless DC motor - not a
stepper motor.
geoff

Strange - that's exactly what I was thinking too. I always had the
idea that the disc rotates at a very constant velocity, which
stepping motors don't do.
CD-ROM spindle motors are generally brushless hall effect sensor types
(at least all the ones I've seen recently are) but isn't that just a
variant of stepper motor? Not trying to be argumentative, I'm just not
sure where the lines are drawn.

No. CD motors spin continuously.

Stepper motors action is to , surprising, step, one distinct step for every
driving pulse. Would not give a very nice clan smooth spin, even at high
speed.


geoff