play around with an old CD-ROM drive - Electronic Circuits Projects Diagrams Free

mdanh2002 · 11th May 2007, 02:56 PM

Hi

I have an old 8X IDE CD-ROM drive removed from my old 386 computer. The CD-ROM drive is still working mechanically and detectable by the computer, but the laser inside has been damaged. Now that I have removed it, I wonder if there are any ways to re-use the component inside? As for the motors, how do I make them move without the computers? I tried connecting it to a computer supply, search for IDE interface and tried trigerring it by feeding input to the IDE cable but did not succeed. I can only make the drive door open/close: the motor to do this was a normal DC motor an its +/- inputs are exposed.

(I could make a floppy drive motor move by feeding input to the cable)

Any ideas?

**Nigel Goodwin** · 11th May 2007, 03:01 PM

Connect directly to the motors, and feed them that way - they are probably all just normal DC motors, due to the low cost of the drives.

things · 11th May 2007, 09:58 PM

actually i have seen some motors in cd drives that have to have a pulsed current in a sequence to move them? because they have 3 connections and don't do much when you hook up dc to them

mdanh2002 · 12th May 2007, 01:41 AM

Only the motor that opens/closes the drive door is a normal DC motor and has 2 connections. There is another one responsible for rotating the disk and it has at least 5 connections - I don't know how to make it move. Maybe a stepper motor? The one with 3 connections you mention is probably a servo, just feed DC to 2 pins and a pulse to the 3rd pin and it should work, but I cannot find such a motor in my drive.

things · 12th May 2007, 02:43 AM

well the motor i mentioned was for spinning the disk. and my guess why it has many connections is because you have to get the right speed for it to read the disk so maybe one is a tacho.

**Nigel Goodwin** · 12th May 2007, 08:22 AM

Quote:

Originally Posted by things

well the motor i mentioned was for spinning the disk. and my guess why it has many connections is because you have to get the right speed for it to read the disk so maybe one is a tacho.

Unlikely, there's no need (or use) for a tacho, the feedback signal comes from the CD itself, and keeps it at a constant linear velocity.

It sounds like it might be a brush-less DC motor?, but these have become less common as prices of drives have fallen so much.

things · 12th May 2007, 09:42 PM

Quote:

Originally Posted by Nigel Goodwin

It sounds like it might be a brush-less DC motor?, but these have become less common as prices of drives have fallen so much.

yes, actually i just noticed,the windings are mounted on the board. and the top part sits over them and spins

.

ParkingLotLust · 14th May 2007, 03:45 AM

I have an old(er) Sony Discman that I tore apart to get the motor out of once... To my dismay, it ended up having four or five leads connected to it. If you listened really closely to it when it played a cd, you could hear it spin up, then spin down, then spin up, etc.

In short, Im wondering about the number of connections too

**Nigel Goodwin** · 14th May 2007, 08:57 AM

Quote:

Originally Posted by ParkingLotLust

I have an old(er) Sony Discman that I tore apart to get the motor out of once... To my dismay, it ended up having four or five leads connected to it. If you listened really closely to it when it played a cd, you could hear it spin up, then spin down, then spin up, etc.

In short, Im wondering about the number of connections too

Sounds like a DC brushless motor, in Discman's the size is obviously critical.

spiffitz · 16th May 2007, 05:53 AM

The disc spinner motors are brushless, hence the 3 wires. For a while the radio control plane guys were modifying these motors by re-winding them to use as a low-profile, lightweight aircraft motor. The aftermarket caught on and now make their own cdrom-type brushless motors, also known as "outrunners".

Example:
http://www.hobby-lobby.com/brushless-motors.htm

Sceadwian · 16th May 2007, 05:58 AM

They're the inverse of standard motors. The coils are stationary, the rest of the motor housing spins. High torque, low inertial mass because the coils aren't spinning.

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11th May 2007, 02:56 PM	(permalink)
mdanh2002	play around with an old CD-ROM drive Hi I have an old 8X IDE CD-ROM drive removed from my old 386 computer. The CD-ROM drive is still working mechanically and detectable by the computer, but the laser inside has been damaged. Now that I have removed it, I wonder if there are any ways to re-use the component inside? As for the motors, how do I make them move without the computers? I tried connecting it to a computer supply, search for IDE interface and tried trigerring it by feeding input to the IDE cable but did not succeed. I can only make the drive door open/close: the motor to do this was a normal DC motor an its +/- inputs are exposed. (I could make a floppy drive motor move by feeding input to the cable) Any ideas?

11th May 2007, 03:01 PM	(permalink)
Nigel Goodwin	Connect directly to the motors, and feed them that way - they are probably all just normal DC motors, due to the low cost of the drives. __________________ PIC programmer software, and PIC Tutorials at: http://www.winpicprog.co.uk

11th May 2007, 09:58 PM	(permalink)
things	actually i have seen some motors in cd drives that have to have a pulsed current in a sequence to move them? because they have 3 connections and don't do much when you hook up dc to them __________________ The 3 laws of science.... 1. If it smells bad, It's chemistry. 2. If it's mushy, It's biology. 3. If it doesn't work, It's physics. www.laserpointerforums.com A forum for disscusion of lasers and laser shows! www.laserchat.org IRC chat for laser and electronic related stuff.

12th May 2007, 01:41 AM	(permalink)
mdanh2002	Only the motor that opens/closes the drive door is a normal DC motor and has 2 connections. There is another one responsible for rotating the disk and it has at least 5 connections - I don't know how to make it move. Maybe a stepper motor? The one with 3 connections you mention is probably a servo, just feed DC to 2 pins and a pulse to the 3rd pin and it should work, but I cannot find such a motor in my drive.

12th May 2007, 02:43 AM	(permalink)
things	well the motor i mentioned was for spinning the disk. and my guess why it has many connections is because you have to get the right speed for it to read the disk so maybe one is a tacho. __________________ The 3 laws of science.... 1. If it smells bad, It's chemistry. 2. If it's mushy, It's biology. 3. If it doesn't work, It's physics. www.laserpointerforums.com A forum for disscusion of lasers and laser shows! www.laserchat.org IRC chat for laser and electronic related stuff.

14th May 2007, 03:45 AM	(permalink)
ParkingLotLust	I have an old(er) Sony Discman that I tore apart to get the motor out of once... To my dismay, it ended up having four or five leads connected to it. If you listened really closely to it when it played a cd, you could hear it spin up, then spin down, then spin up, etc. In short, Im wondering about the number of connections too

16th May 2007, 05:53 AM	(permalink)
spiffitz	The disc spinner motors are brushless, hence the 3 wires. For a while the radio control plane guys were modifying these motors by re-winding them to use as a low-profile, lightweight aircraft motor. The aftermarket caught on and now make their own cdrom-type brushless motors, also known as "outrunners". Example: http://www.hobby-lobby.com/brushless-motors.htm

16th May 2007, 05:58 AM	(permalink)
Sceadwian	They're the inverse of standard motors. The coils are stationary, the rest of the motor housing spins. High torque, low inertial mass because the coils aren't spinning. __________________ "Because I be what I be. I would tell you what you want to know if I could, mum, but I be a cat, and no cat anywhere ever gave anyone a straight answer, har har."