Using disk drive motors. Written by Tomi Engdahl. Why to use components from old disk drives. You might ask why use components from old disk drives. Small stepper motors and controllers. Optical sensors or microswitches. Accurately speed- regulated DC- motor 4.

Creating A PWM Signal Using A PIC 16F84. There are many small mechanisms, particularly servo motors, that use PWM coding as a means of input. PWM signals can also be.

• Pulse-width modulation (PWM) is the ground for control in power electronics. The vast majority of semiconductor power devices.
• Why is there a need for a motor driver circuit? Normal DC gear-head motors requires current greater than 250mA. ICs like 555 timer, ATmega16 Microcontroller, 74.
• This be power motor controller 12V circuit. It can motor control turn advance or walk go backwards all right.

Useful accurate mechanic parts for small projects Disk drive interface description. Power connector pinout. Normal floppy disk drives use normally +1. V and +5. V power supplies.

That depens on the model of the disk drive. The pinout is somehow de- facto. This interface is used in both PC and Amiga computers. Usually PC and AT systems use a special cable which.

Circuit to control RC servos using 0-10V control voltage. 0-10V control for RC servos. This circuit takes standard 0-10V control voltage (for example from. Electronic Circuit Schematics. Note that all these links are external and we cannot provide support on the circuits or offer any guarantees to their accuracy.

A and B motor on and select signals. This makes it possible to have. A and one drive works in this. A and another as B.

Even early hard disk drives also used steppers, but. According one informatin source those stepper motors used in. High- density floppy- drives have 8. Stepper motors usually use.

V power, but some new low- power drives use +5. V power source. for driving steppers. Those motors are usually driven from +5. V source, because. Stepper motors are accurate way of making.

Stepper- motors are not very. You just have to identify the type, wiring and operating voltage of.

Unfortunately stepper motors are. If you want to make your own controller for a stepper.

You are right that there is a controller. It is quite easy to send signals. PC parallel port and small program. The electronics needs +5.

V to operate and usually +1. V for motors. 2. If the disk- drive has function to automatically got to track zero on. This option. can be found from modern disk- drives, but old drives does not have it. Sometimes there is jumper for enabling and disabling this option.

Make sure that the electronics does not need to detect the disk in the. This sensor can be easily. Icono De Microsoft Office Para Rocketdock For Windows. You can also accomplish this. Use drive select signal to select the drive electronics. Then use. direction and step pulse signals to control the steper motor. Disk drive interface stepper motor control signals. The following signals are used to control the disk drive.

First you have to select the. The stepping is controlled using. One low going pulse.

Make sure. that pulse signals are longer than 1 microsecond and you are not sending. I expect that the drive is jumpered to. A. The parallel port pin numbers are according the. PC. Those. pins can be easily controlled in your software by directly writing. You can't use the DOS, BIOS or other operating. LPT1 I/O address is the 1.

Then you simply. write the data you want send to parallel port data pins to this I/O address. Then all you need is to send constant. Suitable. oscillator can be quite easily made using for example 5. IC or. from oscillator built out of TTL logic gates. No big deal. No code needed! The following signals will make the stpper motor. To get the motor to run to other direction.

Jones. has put a a project on the web how to control stepper motors using printer. A Worked Stepping Motor Example. It a part of Control of Stepping Motors tutorial.

Disk drive motors rotate the disk at 3. Standard drives use 3. This can be easily done by connecting both signals.

Usually there are optical sensors or microswiches. Those components are. This can be quite useful component if you can figure. Many modern disk drive drive motors. The modern ATA/IDE drives are basically.

You can use those differents componens. Stepper motors are same types as used in floppy.

The. drive rotating motor is same type of drushless DC motor as used in modern. The physical interface in ST5. The controller cable goes.

Each pulse moved. Each step represented a track location and. Nowadays the. hard disks use voice coil actuators which are harder to use. The stepper motor. The only. difference to disk drive system is that the disk drive electronics. The direction signals works. Step signal is active low pulse signal.

Deactivate the WRITE GATE line (pin 6). Activate the DRIVE SELECT line (pin 2. Wait for READY and SEEK COMPLETE signal to be true. Select the direction with DIRECTION signal. Send the movement pulses using STEP line.

Voice coil actuators used in hard disk systems. Servo controlled voicecoil actuator a very precise method, but. Any variation in the current can. Inherently this is. Precise location of the data track (of. When the servo. informatioin is read, a Position Error Signal (POS) is generated.

A complex feedback. Voice coil positioners always need feedback.

But there is one experiment you can make. First find the wires going to. The check the resistance of the voice. If it is. 4 ohms or more, then you can try to drive it directly using an. Replace the speaker with the voice coil and.

The voice coil will move back and forth. Be careful with. the experimenting, because the voice coil can be burhed down easily.

And remeber also that you can. A direct drive, brushless DC. The spindle and the platters, are rotated at a constant. RPM, though newer models have. The spindle motor receives control signals through a. Control signals come from.

Older drives have used magnetic hall or coil type. First they accelerate the spindle to the full speed. I have also used some reference books to check. The ideas how to. I have used. parts from old disk drives in many of my electronics projects (most.

That paper. is available at http: //www.