3.5 floppy motor wiring?

Forum 2005-2010 (read only) General Frequently-Asked Questions
1

I was wonder how to wire up an old 3.5 floppy drive motor. I'm I right in thinking that this motor is a small stepper motor? I have already taken the motor out and it only has four wires. I thought stepper motors had six??

??
I have no clue. noobie here. I just wanted to play around with one.

2

I also want to control my 3,5" floppy (bipolar) stepper motor. I already tried it but it doesn't turn, it only schockes from left to right.

I also have a unipolar stepper motor but I tried this:

I don't know how to connect te wires. When I connect the yellow, black, brown and orange to the digital ports and the red one to the ground, it turns. But when I disconnect the red wire it still turns, without a connection to the ground. It doesn't have much torgh too.

3

Ok first how many wires does your stepper have?

4

The floppy stepper motor has 4 wires and the unipolar stepper motor has 5 wires. I think the bipolar stepper motor doens't work because you also have to change current per coil.

For the unipolar stepper motor I found this website to find out wich wires is are wich:
http://www.doc.ic.ac.uk/~ih/doc/stepper/others/

5

The motor that I got was from an old floppy drive with four wires. what kind of motor is this??

6

nevermind it's bipolar. does any one want to share some sample code for a jump start?? thanks

7

hi

The Arduino can't directly drive motors, so you will first need a driver , to amplify the signals from the Arduino to a level useful for the motor.
All the exciting details about a good bipolar driver are here:
http://www.arduino.cc/cgi-bin/yabb2/YaBB.pl?num=1138310274

D

8

You can drive a floppy step motor directly from the arduino. BUT you need to keep the floppy controller board. The control has a 5V logic interface that controls the steps, the direction and the home position sensor. I had to read all 3 of these before I understood it.

http://www.doc.ic.ac.uk/~ih/doc/stepper/tm100/
http://jewel.morgan.edu/~tmalone/dskdrv/dskdrv.html

5.25 and 3.5 drives have the same wiring just a different connector style
You can also hack the disk motor and the sensors
Kirk

9

Has anyone tried harddrive motors? Will they work, too?