Controlling Floppy Drive Stepper Motor via Parallel Port. Warning The PC parallel port can be damaged quite easily if you make incorrect connections. If the parallel port is integrated to the motherboard, repairing a damaged parallel port may be expensive, and in many cases, it is cheaper to replace the whole motherboard than to repair that port. Your safest bet is to buy an inexpensive I/O card which has a parallel port and use it for your experiment. If you manage to damage the parallel port on that card, replacing it will be easy and inexpensive. Disclaimer While every effort has been made to make sure the information in this article is correct, the author cannot be made liable for any damages, whatsoever, for loss relating to use or implementation of this article. Introduction In this article, we will connect a 3½ inch floppy drive to our computer's parallel port and write a program to control its stepper motor. We will not have to worry about making the electronics for controlling the stepper motor.
Stepper Motors What they are? Pin-out Note. (Howto) Walz a Hard Drive Spindle Motor | Let's Make Robots! This is a continuation of my blog on the same subject. Please continue your commenting here. I am the proud owner of a stack of scavenged hard drives. I hoped to find really fast, torqueless motors inside. But instead I found myself a project for my new found 555 knowledge. The logic chip 74164 is a "Serial In Parallel Out bit shift register" (datasheet). S1 acts as a reset button. The motor driver is the well known L293D.
The EN/able pins apparently do not need pulling down to work. The video lasts as long as 10 minutes. Avenues of improvement It has been suggested (by oddbot and robologist) that the shape of these square/block wave can be improved upon. Also the control method can be improved a lot. Furthermore a decent feedback mechanism could make the driver much more intelligent. Practical issues Finding the right leads. Just as in a stepper motor, measure the resistance through the coils. The resistance through any connection from a colour to a colour would be about twice as much. 8ik. HDD motor driver. Brushless DC Motors - a knol by Arun Kumar Reddy Kothapally. In a conventional (brushed) DC motor, the brushes make mechanical contact with a set of electrical contacts on the rotor (called the commutator ), forming an electrical circuit between the DC electrical source and the armature coil-windings. As the armature rotates on axis, the stationary brushes come into contact with different sections of the rotating commutator.
The rotor assembly may be internal or external to the stator in a DC brushless motor. The combination of an inner permanent magnet rotor and outer windings offers the advantages of lower rotor inertia and more efficient heat dissipation than DC brush-type construction. The elimination of brushes reduces maintenance, increases life and reliability and reduces noise and EMI generation. The possible number of phases and winding arrangements for the DC brushless stator are quite varied. As in the case of brush type DC motors, increasing the number of phases reduces torque.
Conventional motors brushless motors rotor Similar to AC i. Solarbotics.net -- Home page.