This is a continuation of a thread I started in a different forum, but I think it belongs here now. The old thread is here: http://forum.allaboutcircuits.com/showthread.php?t=76395
Basically what I am attempting to do is transform a hard drive into a cheap Tesla turbine generator that can put out enough power to drive a mcu and some other components. I have about 24 hours of research invested in this so far, so I decided to just take apart my drive and go for it.
A Tesla turbine is a fin-less rotor design. It makes use of a stack of thin plates stacked closely to one another. When high speed air is blown tangentially across the edge, the air interacts with the rotors via viscosity and skin friction to accelerate them. As the air loses momentum, it travels towards the center of the rotor where it is exhausted out of drilled ports. This design is very simple and very stable at high RPMs.
I am using a hard drive because the platters are already closely spaced (not ideally spaced, but good enough) and are already attached to a high speed bearing. The drive motor should be able to be coaxed into working like a generator as well, which eliminates adding additional hardware to the build.
To try it out, I found an old SCSII server drive that has been kicking around my house for a few years. I completely gutted it, then re-installed the platter assembly. You can see the backside in the first picture where I have attached some hook up wires.
I am running two of the contacts through a 1 Ohm resistor to place a load on the motor. The other two clips in the picture are running to my O-scope so I can take a look at the waveform and get a voltage measurement out of it.
To spin the plates up to speed, I'm using a 20 psi air source and just holding the tip of the tube near the plates. This is not optimal and I am losing quite a bit of power doing this. The plates are also not vented yet, so the turbine is running at a small fraction of its potential output...but for a proof of concept, it gets the job done.
Picture #2 is the Oscilloscope screen. You can see here the motor is producing a nice sine wave at 1.65V. With a 1 Ohm load, this is 1.65A or about 2.7W of power. I didn't have a helper to take this picture, so I had to set the air supply down. This let the drive spin down for a few seconds before I could snap the shot. Before setting the air down, the drive was up to just north of 3V (9W).
In the next few weeks I'm going to vent the rotor, smooth out the pocket for the platters, make a real nozzle and try running higher pressures. I'm hoping these modifications will let me hit between 15 and 20W of power which should be plenty to run a small project.
Basically what I am attempting to do is transform a hard drive into a cheap Tesla turbine generator that can put out enough power to drive a mcu and some other components. I have about 24 hours of research invested in this so far, so I decided to just take apart my drive and go for it.
A Tesla turbine is a fin-less rotor design. It makes use of a stack of thin plates stacked closely to one another. When high speed air is blown tangentially across the edge, the air interacts with the rotors via viscosity and skin friction to accelerate them. As the air loses momentum, it travels towards the center of the rotor where it is exhausted out of drilled ports. This design is very simple and very stable at high RPMs.
I am using a hard drive because the platters are already closely spaced (not ideally spaced, but good enough) and are already attached to a high speed bearing. The drive motor should be able to be coaxed into working like a generator as well, which eliminates adding additional hardware to the build.
To try it out, I found an old SCSII server drive that has been kicking around my house for a few years. I completely gutted it, then re-installed the platter assembly. You can see the backside in the first picture where I have attached some hook up wires.
I am running two of the contacts through a 1 Ohm resistor to place a load on the motor. The other two clips in the picture are running to my O-scope so I can take a look at the waveform and get a voltage measurement out of it.
To spin the plates up to speed, I'm using a 20 psi air source and just holding the tip of the tube near the plates. This is not optimal and I am losing quite a bit of power doing this. The plates are also not vented yet, so the turbine is running at a small fraction of its potential output...but for a proof of concept, it gets the job done.
Picture #2 is the Oscilloscope screen. You can see here the motor is producing a nice sine wave at 1.65V. With a 1 Ohm load, this is 1.65A or about 2.7W of power. I didn't have a helper to take this picture, so I had to set the air supply down. This let the drive spin down for a few seconds before I could snap the shot. Before setting the air down, the drive was up to just north of 3V (9W).
In the next few weeks I'm going to vent the rotor, smooth out the pocket for the platters, make a real nozzle and try running higher pressures. I'm hoping these modifications will let me hit between 15 and 20W of power which should be plenty to run a small project.
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