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Improved Electrostatic Turbine Made from Recyclables

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     This is a completely scratch-built, electrostatic turbine (EST) that converts high voltage direct current (HVDC) into high speed, rotary motion. My project was inspired by the Jefimenko Corona Motor which is powered by electricity from the atmosphere: 
http://blog.modernmechanix.com/the-amazing-motor-that-draws-power-from-the-air/

   The turbine was constructed from the following items: plastic tubes and drinking straws, nylon spacers, cardboard, sheet metal connecting and mounting hardware as well as a HVDC power source used in place of the earth's electric field. The turbine features a clear plastic housing that reduces the risk of accidental HV contact while permitting an inside view of the turbine for classroom and science fair demos. When operating the turbine in a darkened room, corona discharge produces a ghostly, blue-violet glow that illuminates the inside of the housing. A side-by-side comparison of an earlier version of the EST shows the smaller, more streamlined profile

   I used simple hand tools and an electric drill for construction. An earlier version of my EST is available for sale here:  http://www.ebay.com/itm/Home-Built-High-Voltage-Electrostatic-Turbine-/190977318203?pt=Educational_Toys_US&hash=item2c77229d3b
 
    Caution: This project can produce ozone gas and should be operated in areas with adequate ventilation. Work gloves are recommended when working with sheet metal due to sharp edges. Lastly, HVDC is not always user-friendly, so act accordingly!
 

 
 
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Step 1: How Does the EST-3 Work?

Picture of How Does the EST-3 Work?
    The EST has 6 foil electrodes with razor sharp edges that encircle a plastic rotor. There are 3 series-wired, hot electrodes that deposit charged particles on the rotor's surface. Hot electrodes alternate in polarity with 3 grounded rotors (in this case: Hot-Gnd-Hot-Gnd-Hot-Gnd). The hot electrodes spray the rotor with like charges, which the electrodes then repel, causing the rotor to spin. Through the process of induction, each hot electrode attracts the rotor segment that was electrically neutralized by the preceding ground electrode. The rotor has a sheet metal backing to optimize the electric field gradient between each electrode's leading edge and the rotor's surface.

   The action of hot electrodes spraying ions on the rotor coupled with ground electrodes on clean-up detail enabled the unloaded turbine to reach 3,500 RPM using an industrial grade ionizer. The sketch shows a prototype EST with 8 electrodes which was a miserable failure due to internal arcing between electrodes placed too closely together. Take-away Lesson: Make sure electrodes are properly insulated and/or spaced apart before using a high output power source; otherwise, your turbine could be reduced to a smoking hot mess!

Step 2: Locate Plastic Tubes for Housing & Rotor

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    I found these acrylic tubes in the scrap bin of a local plastics store. I used them to make the turbine housing and rotor. The exact dimensions don't matter. One tube should fit inside the other with several cms clearance all around. Rigid plastic bottles, such as vitamin containers, with the tops and bottoms cut off would also work.

Step 3: Cut Out Electrodes from a Turkey Pan

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   Six electrodes were cut from a discarded aluminum turkey basting pan left over from a dinner party. (Construction Tip: Use a pan for coking a large bird, metal is heavier and less likely to bend.) I cut the length of each electrode approximately equal to the rotor length while making an effort not to crush to rolled edges.

Step 4: Insert Electrode Support Rods

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  I inserted an 8-32, threaded rod segment through the hole of each electrode (fit was spot on!). Segments were 3.0 cms longer than the turbine housing. 

Step 5: Flatten Leading Edges of Electrodes

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     I removed corrugations and dings in the foil with a rolling pin.

Step 6: Trim & Round Off Electrode Edges

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      Leading edges of each electrode were trimmed to 1.0 cm using a paper cutter. The corners were rounded with a hobby file to reduce corona leakage.

Step 7: Cut Retainer Plates & End Caps for Housing & Rotor

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     I cut a set of 6 cardboard discs to make housing end caps (4 = housing OD); another set of discs for rotor end caps (6 = ID); and finally, I cut a third set of discs to make retainer plates for the bearings (2 = rotor OD). 

Step 8: Check End Caps, Rotor & Housing

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   I slipped the rotor and housing end caps over a 1/4 inch diameter, hardwood dowel that served as the turbine shaft. Later in the construction, the dowel was upgraded to an acrylic rod for improved appearance. I verified end cap placement and checked that the rotor was concentrically positioned in the housing. (Construction Tip: Wrap paper tape smeared with wood glue around discs until they fit tightly in tubes.)

Step 9: Re-Drill Housing End Caps for Bearings

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   I used wood glue to assemble the housing and rotor end caps. Next, holes were drilled 60 deg apart along the outer circumference of the housing end caps so they could accept threaded support rods. A secnod ring of holes 120 deg apart was drilled midway between the outer ring and the center. A corresponding hole set was drilled through the retainer plates. Initially, I drilled out the centers of the housing end caps to accept metal bearings. However, they drew sparks from the tips of the electrodes as the turbine approached full power.

   I found a work-around that involved 1/4 inch ID, non-conducting nylon spacers as bearings. I secured them with three 8-32 nylon bolts inserted through the retainer plate. There was some rolling resistance when I hand spun the rotor, but the turbine probably wouldn't scorch and turn into a SHM (smoking hot mess).  :>D 

Step 10: Drill Mounting Holes in Housing

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   I drilled two, 1/4 inch mounting holes through each end of the housing tube. The holes accepted 1/4 inch nylon bolts with lock washers and hex nuts.

Step 11: Attach Connecting & Support Hardware to Electrodes

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   Two ring connectors were slipped over each ground rod as shown. I used rubber grommets (3/16" ID) as stand-offs. This procedure was repeated for the electrified end of the turbine. Everything was temporarily secured with nylon acorn nuts to check for a good fit. (Rotor was not installed at this point.)

Step 12: Prep Rotor Assembly

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   Initially, I covered the rotor tube with a metal sheet cut from a beer can and then spiral wound plastic tape around the tube. Later, when powering up the turbine, it wasn't long before internal arcing from the electrodes punctured the tape and ruined the rotor -- !@#$, another toasted turbine! (Three puncture arcs appear as starbursts in the low light picture). 

     A better idea was to remove the original tape and cover the sheet metal with a thicker insulating material possessing higher dielectric strength. I used a sheet of heavy duty plastic cut from a package of dog treats which I secured with tape.

Step 13: Install Rotor Assembly

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   I removed ground end hardware from the turbine and inserted the completed rotor until the shaft fully engaged the bearings. Ring connectors were added at the 5:00 and 7:00 o'clock positions for power input.

Step 14: Repair & Insulate Electrodes

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 The turbine was unlikely to work properly b/c several leading edges were bent while inserting the rotor assembly. My work-around was to disassemble the turbine and then epoxy a coffee stir stick to each electrode as a support beam. The sticks were prepped using med/fine sand paper and then colored with a silver paint pen.

     I used 12 color-coded straw sections (0.5 cm ID x 3.5 cm) to insulate the support rods. Each section slipped over a support rod, passing through both grommet and end cap holes.

Step 15: Reassemble Turbine & Adjust Gaps

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   After putting the turbine back together (again!) and series-wiring the hot and ground electrodes, I atached input wires to the binding posts. Gap distances were adjusted by torquing the acorn nuts at the end of each rod until leading edges were within 1 mm of the rotor's surface. I cut a sleeve from a 1/4 inch ID "Big Gulp" straw and slipped it over the axle ends to limit side-to-side rotor movement.

Step 16: Test Run

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   The turbine was humming at 13.5 kV with a 1.0 mAmp draw; higher potentials caused arcing and power loss. Here are several videos showing two versions of the EST operating at high speed:

http://www.flickr.com/photos/87819267@N03/10427274846/
http://www.flickr.com/photos/87819267@N03/10427367055/

Stay tuned for updates on what the EST can do!




  
de4th983 months ago
I can not tell if it creates power or needs power?
brazilero2008 (author)  de4th983 months ago
The turbine requires a high voltage DC power source. A room air ionizer should work if rotor bearings have low friction.
de4th983 months ago
I can not tell if it takes power or creates power?
rrodríguez494 months ago
Just one more thing, how did you take the DC? Do you think a cellphone charger works? Thank you , amazing work!!
brazilero2008 (author)  rrodríguez494 months ago
You would need a high voltage DC source. A negative ion generator should work if rolling friction of rotor is low; but a better choice would be an oil burner transformer w/a voltage multiplier: http://www.instructables.com/id/Build-a-Variable-High-Voltage-Power-Supply/. I used an industrial air ionizer, which is similar. Good Luck!
rrodríguez494 months ago
Do the electrodes are in contact with the rotor? Or they are separated?
brazilero2008 (author)  rrodríguez494 months ago
There is a gap of about 1 mm between the rotor surface & the electrode. The smaller the gap, the faster the rotor spins.
Carlos Marmo5 months ago
Muiiito Legal!!!
brazilero2008 (author)  Carlos Marmo5 months ago
Obrigado!
zygomatic5 months ago
Amazing work! What kind of torque or output power can you get out of that thing?
brazilero2008 (author)  zygomatic5 months ago
Project requires some tweeking. I will post specs in the next update. Thanks for your interest!
Nicola Tesla6 months ago
Skimming through the tutorial, i may have missed it; but what did you happen to use as a power supply? I would love to make this Turbine, i really do love things that work with high voltage, but my main issue tends to be me not being able to get my hands on such high voltage generators capable of powering such marvelous machines. And by the way, amazing tutorial!
brazilero2008 (author)  Nicola Tesla6 months ago
My bad! A Van de Graaff or Wimshurst generator would work; or, try using a DIY, HV X-former w/multiplier. Here's a picture of one that I used.
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OK, so I was looking up hv xformer power supplies, and this was the only thing that came up! Am I looking up the wrong thing, or...? It doesn't seem too difficult to make... And would love to try and make one... If you could send me a link on the tutorial on hpow you made yours, or even make a able on how you made it?
Cheers!
brazilero2008 (author)  Nicola Tesla6 months ago
Try searching Youtube for "High Voltage Power Supply." Here's an example:
http://www.youtube.com/watch?v=GEuK1OdYxHk

Good Luck! 
Ah, ok. Thanks for the link! If i can ever make one of these that actually works, this turbine will be one of my first projects!
adillbeck6 months ago
Could this be used to generate electricity if you spun the turbine?
brazilero2008 (author)  adillbeck5 months ago
It won't generate electricity if operated in reverse. A hand-cranked Wimshurst machine (or something similar) would be a better choice to produce electricity.
rimar20006 months ago
Could you add a video?

Anyway, great work!
brazilero2008 (author)  rimar20006 months ago
Here's a vid from an earlier version of the project; check back later for the update. Thanks for watching!

Http://www.youtube.com/watch?v=skgFyaGE5hA
Awesome, really. Thanks for your response.
dtpit6 months ago
how to rotate inner cylinder
brazilero2008 (author)  dtpit6 months ago
Electrostatic attraction/repulsion turns the rotor.
petercd6 months ago
Fantastic use for HV ionizers and great construction too, a tip on the bearings for lower friction is to wash them in spirits or thinners to get rid of the original lube and dry them out with compressed air. Now add just one drop of light oil, I used Reflo68APetro Canada (fridge compressor oil, very thin), on my Bedini motors and the difference is amazing, even when spun just by hand.

Nice one... eagerly awaiting updates or video even.
brazilero2008 (author)  petercd6 months ago
It's a good idea to clean the bearings w/thinner; I washed the nylon parts w/soapy water, which probably left a residue. Vid is coming.
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