Electrostatic Turbine: Basic & Enhanced Versions

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Static electricity is high voltage (HV) at low current. That unexpected ZAP! occurring when you walk across a carpet and touch a metal object demonstrates HV conduction by ionized air particles. Ion wind turbines use electrostatic forces acting between these particles to produce mechanical movement.

I decided to go green by making this desk-top project from mostly dollar-store hardware; re-purposed plastic, cardboard and aluminum disposables from my kitchen recycling bin as well as some curbside junk from the neighbors next door. The turbine uses foil electrodes that encircle a plastic, tubular rotor. Each electrode has a sharp edge that sprays a stream of positive or negative ions on the rotor's surface. When these electrodes are arranged so they alternate in polarity around the rotor, each electrode repels a rotor segment carrying the same charge and simultaneously attracts that rotor segment carrying charges deposited by the preceding electrode.

Many sources of static electricity --from old CRT screens that "crackle and pop" when powered up, to room air ionizers -- will spin a reasonably well constructed turbine. You can view an enhanced version, constructed from better components and featured on this page w/the basic version, in operation here:

http://il.youtube.com/watch?v=cXD9W1LtG7A



TOOLS
The tools required for this project are a(n): marking pencil; felt tip pen; ruler; compass; protractor; utility scissors; metal saw; desktop paper punch; high speed electric drill with 1/32,” 1/8 “ and 1/4 “ bits; assorted grit sandpapers; sanding block; miniature hobby file and some Gorilla Glue. In addition to the parts listed in STEP 1 you will need a rubber band as well as rolls of paper and cellophane tapes.

CAUTIONS
Unlike many DIY electrostatic motors that creep along at hundreds of RPM, this bad boy can spool up to thousands of RPM in only seconds when sufficiently powered. Work carefully and don’t forget the safety glasses! Also, operate the turbine in a ventilated area if you smell ozone gas. So let's begin...

Step 1: Parts List for Basic Version

Here is a list of the parts (there's plenty of opportunity to improvise if a specific part is not available).

A. Rotor Assembly
1. Cylinder (1)               3 oz plastic container of Pounce Cat Treats
2. Conductive Liner     2-1/4 x 7” aluminum strip cut from soda can
3. Disks (2)                   2-1/4” dia disks with 1/8” center hole cut from 1/8” cardstock
4. Shafts (2)                  1/8” dia x 6” metal rod; #6 x 1-1/2“ metal bolt with lock washer & nut
5. Collars (2)                 #6 de-threaded nylon nuts


B. Rotor Cage Assembly
1. Floor & Roof Disks (4)       3-3/4” dia disks with 1/4” center hole cut from 1/8” cardstock
2. Bearings (2)                         #6 nylon flat washers
3. Hubs & Insulators (10)      1/4“ dia x 1/8” flanged, nylon screw insulators
                                                    (http://www.smallparts.com)
4. Support Columns (4)          1/4” dia x 2-7/8” wood dowels


C. HV Electrode Assembly
1. Power Rods (4)                     1/4” dia x 2-7/8” wood dowels
2. Conductive Jackets (4)         foil chewing gum wrappers
3. Ionizers (4)                              2-1/4” x 2-1/2“ strips cut from aluminum pie pans
4. Connecting Leads (2)           4” of #20 AWG insulated wire
5. Lead Clamps (8)                   plastic push pins
6. Input Terminals (2)                ring connectors w/#20 AWG insulated input leads


D. Final Assembly
1. Fly wheel (1)                           2-1/4” dia disk with 1/8” center hole cut from 1/8” cardstock
2. Flywheel Spinner (1)             metal tip from ballpoint pen
3. Project Base (1)                     1/8“ cardstock
4. Turbine Shroud (1)                cardboard peanut container (4" dia x 3-1/8")
5. HV Rim Insulators (1)           plastic, snap-on, peanut container lids
6.Mounting Stand-offs (2)         empty plastic or styro thread spools
7. Power Source (1)                   DIY HV X-former w/multiplier or a commercial HVDC source (example:  
                                                       http://www.techkits.com


 
 

Step 2: Make & Line Rotor Cylinder

   Construct rotor by removing the top and bottom ends of a cat food container to form a 2” long cylinder. Remove label and sand edges with fine paper until level.

   Cut aluminum strip to specified size and line inside of cylinder. Trim width as needed to minimize overlap. Strip will serve as a conductor to attract ions to the rotor and also provide a seat for the rotor disks.

Step 3: Prepare Rotor & Flywheel Disks

   Covers from 3-ring binders are perfect sources for 1/8” cardstock used for this project. First, remove the plastic sheathing from the binder. Cut and drill three disks as specified for the rotor and flywheel.
  
   Insert the #6 x 1-1/2” metal bolt through the holes. Clamp disks firmly against the bolt head with a lock washer and nut. Chuck assembly in an electric drill. Using a sanding block and medium grit paper carefully grind disks to a diameter of 2-1/4.” Rub a thin layer of glue on the surfaces and edges of the disks to strengthen the cardstock. Allow disks to dry and sand lightly with fine grit paper until surfaces are smooth.

Step 4: Assemble Rotor

   Press fit one disk into each end of the cylinder; they should fit snugly and rest against the aluminum liner installed in STEP 2. The outer disk surfaces should be flush with the edges of the cylinder. If the disk diameter is too small, just wrap some paper tape around the circumference to achieve the necessary diameter. Trim excess tape until disk surfaces are level.

   Bond the liner to the inner cylinder wall with a small amount of glue. Do not glue the end disks in place at this time — you will need to balance the rotor later. Place the third disk aside for later use in STEP 13.

   Cut the rotor shaft to size and slide it through the disk centers. Make shaft collars by removing threads from two #6 nylon nuts with round hobby file until they fit snugly over the shaft. Slide one collar to the end of the shaft and secure with glue. Place this assembly and remaining collar aside at this point.

Step 5: Cut, Mark & Punch Rotor Cage Disks

   Cut and drill center holes for the four disks to make the cage floor and roof. Remove 1/8” from the edges of the disks to make a flattened base for mounting your turbine. Sand edges until level.

   Mark placements on one of the disks with a protractor to accommodate four support columns and four power rods. The placements must be equally spaced at 45 degrees and 1/4” from the circumference. Use this disk as a template for the three remaining disks.

   Make the eight placement holes in each disk with a paper punch. Verify alignment of the holes as well as the flat edges of all disks. Apply glue sparingly to join two disks to make the cage floor. Repeat this step with the two remaining disks to make the roof.

Step 6: Construct Rotor Bearings

   Construct left and right rotor bearings from nylon insulators using a #6 nylon flat washer which is centered and glued to the flanged side of the insulator. Carefully enlarge the center hole of each disk pair with a hobby file. Press fit the bearing assembly through the hole so the flange seats firmly against each disk’s surface.

Step 7: Assemble Rotor Cage

   Assemble rotor cage by placing two insulators over each column with the flanged side facing outward and 1/4“ of the column protruding past the flange. If necessary, wrap a layer of cellophane tape around each column to keep the insulators from slipping. Insert columns into the 12, 3, 6 and 9 o’clock positions with respect to the flat edge of the floor disk.

   Before inserting columns into the corresponding roof holes, insert the axle assembly in the cage so the axle passes through both floor and roof bearings. Attach and adjust the roof so that both disks are parallel and rest solidly on the insulator flanges.

   Push the axle through until the shaft collar rests against the roof bearing. Slide the remaining collar on the opposite end of the axle. Hold everything together temporarily with a rubber band.

Step 8: Balance Rotor

Adjust the movable collar to allow rotor to spin freely when the cage is placed on its side. If the rotor stops in the same position, disassemble it and apply paper tape to the rotor’s inner wall to counter balance. Once the rotor is balanced, glue the end disks to the plastic cylinder. However, do not glue support columns to the floor and roof disks at this time.

Step 9: Power Rod Construction

   Because the turbine runs on little current, all metal surfaces (except ionizer edges!) must be smooth to reduce corona leakage. Begin power rod construction by drilling a 1/32” center hole about 1/2“ deep into both ends of each rod. Wrap the rods with chewing gum foil to make conductive jackets. Ensure that all edges are smooth.

Step 10: Fold & Wrap Ionizer Strips

   Make a 1/8“ lengthwise crease on both sides of each ionizer strip and fold inwards. Wrap a strip around each power rod so the fold is on the inside of the foil roll.

Step 11: Power Rod, Rotor & Cage Assembly

   Enlarge the remaining holes in the floor and roof disks slightly with a round file to accommodate the jacketed rods. Position the rods so that the folded edges of the ionizers face the rotor’s surface. Assemble the rotor-cage assembly using glue to secure the columns; but do not glue to power rods in place.

   Secure ionizers to the rods with glue allowing about a 1/8“ gap between each electrode edge and the rotor.

Step 12: Wiring the Turbine

   Select two rods at one end of the cage that are mutually opposite. Join them together with a connecting lead and two clamps by removing sufficient insulation from both lead ends. Wrap several turns of the bare wire around the metal shaft of each clamp. Place a ring connector with lead wire under the head of one clamp. Press clamp shafts firmly into the center holes that you drilled in the rods in STEP 9. Repeat this procedure for the other end of the cage.

   Insert remaining clamps into the free end of each power rod to secure them in the placement holes of the disks. Adjust the electrode-rotor gap by turning the clamps to achieve the correct distance

Step 13: Attach Flywheel & Spinner

Secure the flywheel and spinner on the rotor shaft with glue.

Step 14: Final Assembly

     Your turbine is almost ready to roll :>). Just peel off the label and carefully remove the bottom of the peanut container with a can opener without damaging the container rims. Insert the entire rotor-cage assembly from the bottom so that the top lip of the container serves as a backstop.

     Cut out a 3-1/2" diameter circle from both snap-on lids and use them to insulate the container rims from the HV leads and clamp shafts. These lids will also keep the turbine in place.

     Decorate the flywheel with a felt pen and glue two thread spool stand-offs to the container. Mount the everything on a cardstock base. I attached rubber feet and input terminals to the base for a more finished appearance.

Step 15: Powering the Turbine

    I powered my turbine with a DIY, 12-stage, Crockcroft-Walton multiplier. However, a blinged-out power source isn't essential; almost any commercial electronic ionizer rated at 6 kV or better is adequate. Even a large diameter CRT can provide momentary power for the turbine.

     Tape a large sheet of aluminum foil to the screen, fold the edges to reduce corona leakage and attach an insulated wire from the sheet to one of the turbine’s inputs. Connect the remaining terminal to a suitable ground.

Step 16: Troubleshooting Tips

     The following variables will affect your turbine’s performance: (a) electrode-rotor gap, (b) bearing friction, (c) rotor balance and (d) inter-electrode distance. The first three items are very important if you select weaker power sources for your turbine.

     Irregular gap distances will produce uneven electrostatic forces on the rotor causing the shaft to rattle in bearings with too much wiggle room (if the bearings that are too tight, the rotor will bind). Of course, an imbalanced rotor also will limit performance.

     Because the average breakdown voltage of air is ~3 kV /millimeter, non-insulated or closely spaced electrodes can arc causing a sudden power loss and a drop in speed.

     Construction Tip: A mini flourescent backlight from discarded handheld computer makes a great indicator of corona breakdown. Glue the lamp along the length of the shroud and attach one lead to ground; leave the other end unconnected as an antenna. The lamp will flicker if any flashover occurs in the turbine.
 

Step 17: Enhanced Version: Optimizing the Wow Factor

     Consider mounting your project on a wood cigar box with stand-offs. Place your preferred power supply inside the box. I used a DIY, HV X-former w/a multiplier potted in candle wax and then wired in an ON/OFF switch (left) as well as a DC power input connector (right). Next, I sprayed the shroud with high-gloss, metallic paint and replaced the cardstock flywheel with a plastic fan blade. I glued a plastic fruit smoothie cover on one of the snap-on lids to serve as a fan blade cover. Lastly, I used rub-on letters to identify the project. (The wording on the shroud should read: "Electrostatic Turbine," but I ran out of letters!)

     To optimize performance, I replaced the nylon bearings with oiled, stainless steel flat washers and added an extra pair of ionizing electrodes to increase torque (see sketch for details). When this maxed-out version was connected to an industrial ionizer w/an output of 12 kV @ 1.0 mA, it sounded like this: http://www.youtube.com/watch?v=skgFyaGE5hA&feature=related. Input voltage of this enhanced design should top off at 12 - 13 kV. Higher voltages may arc and could permanently toast your turbine :>O. This version of the project is available for purchase here: http://www.ebay.com/itm/Home-Built-High-Voltage-Electrostatic-Turbine-/190977318203?pt=Educational_Toys_US&hash=item2c77229d3b

That's all for now. Thanks for your interest in this project!

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    90 Discussions

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    Aneriah

    2 years ago

    Hey man awesome work, this is a great design. I just have a few questions...

    1. How hard is it to build?

    2. What is the total cost of everything, including a charger.

    3. Also if I were to hook this up to my bike what would be the effect? How fast would it go and how long would it last?

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    Zanderist

    4 years ago on Introduction

    I just want to put an idea out there, I looked into Jefimenko, and I was wondering if the concept of drawing electricity from the air could be applied to a hydrogen fuel cell. I know that this post isn't in spirit of what this build is about. But I'm thinking in terms of upping efficiency, as opposed to using electricity to directly run a motor use it to produce a better energy source and have it drive a small modified motor.

    Again I don't feel that this post relates totally to what this build is, but its an idea I want to put out there for anyone reading. I just want to see a successful build of a motor that's powered by the atmosphere. It would bridge the Gap between reality and science fiction.

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    Zanderistkristahiles

    Reply 4 years ago on Introduction

    I'm thinking maybe then have four units, replace the turbines with gears and have them turn a larger diameter in the middle.

    And from what I understand its very low current very high voltage so you can connect the motors in parallel to the circuit and probably maybe a small current draw of under 50mA. (I'm not certain of this)

    Probably a large flywheel just to give it initial starting kick that would be spun by hand.

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    These motors suffer from serious power loss due to corona leakage as voltage is increased. Four of them connected in parallel would probably require more than 50 mA to run.

    I'm working on getting a ES motor to spin a flywheel.

    There is an updated version of the project here: https://www.instructables.com/id/Improved-Electrostatic-Turbine-Made-from-Recyclabl/
    Good Luck.

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    Zanderist

    4 years ago on Introduction

    I thought this type of motor was science fiction.

    Anyways I just wanted to say that maybe you could develop more torque if you added smaller cylinders along the outside circumference of the main rotor like a planetary gear drive.

    Plantary gear.jpg
    1 reply
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    A knife edge is still required to produce a corona discharge between each HV electrode and the rotor's surface; otherwise, you're correct. There is too much stray leakage from the ends of the electrodes which caused the internal arcing in this demo vid:
    http://www.flickr.com/photos/87819267@N03/10427367055/
    .

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    KimberlyPmobuto

    Reply 6 years ago on Introduction

    Yes!

    Check out the Oxford Bell
    http://en.wikipedia.org/wiki/Oxford_Electric_Bell

    Also check out http://en.wikipedia.org/wiki/Atmospheric_electricity

    Just like a hydro electric dam taps into the energy produced by the condensation cycle and gravity we can tap into the electric field potential and drive a capacitor motor or a Tank Circuit coupled to a motor which drives a gen set, or think piezoelectric transformer.

    The biggest challenge to make it practical is new materials. Air is a great conductor at high voltages.

    A neat idea would to build off the ideas using modern materials and thinking.

    For example: Harvest the potential and use it to oscillate a piezoelectric stack inside a tubed ring with a pressurized gas such as helium, and then embed heat pipes in a porous stack which has pyroelectric sensors or you could go the magnetostrictive route and use terfenol D. This would work much like the accoustic refrigeration. The vibration would cause changes in temperature and if you also had small slat plate heat exchangers connected to the thermal stacks which have the pyroelectric sensors embeded in them. Then you could have a small package which harvested both the electric field and thermal variations simultaneously. You want it in a ring so the resonance synchronizes all the thermal stacks with the pyroelectric sensors.

    Try it out and you will be surprised.

    Like any type of Stirling engine the higher the pressure the more mechanical energy per stroke, the temp difference sets how many strokes in a given time.

    So whereas with piezoelectric we want to be in the ultrasound region for best power harvesting, with terfenol D you will want higher pressure and a bit lower frequency. If you had a constant source of temperature say the ground at 60 feet then you could couple a heat pipe to the ground and insulate it to an insulated container with a thermal fluid and attache a heat pipe from there to your ring. Then use a refrigerant like ethane and have it at rest at the pressure and temp where one K condense or vaporizes it. This would set you up for the greatest changes in pressure and frequency and rate changes in temperature.

    Pyroelectric like piezo electric want high rates of change. Where as the Seebeck effect wants a large temp differential. With conventional stirling engines we want the highest pressure which yields the greatest mechanical force per stroke and aids in the speed of thermal transport through the gas, and the greatest temp differential so we can have a high number of strokes in a given time period.

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    Good ideas; so I'll just respond to one. I'm planning to use a box kite to lift 200 m of HV cable into the air. The voltage gradient from an earth ground to a point above ground is ~100 V/m. A cable suspended at that height should supply ~20 kV (on a good day), which is sufficient to power the motor. Will post results as an i'ble when available. Ck out this site for more details:

    http://www.rexresearch.com/jefimenko/jefimenko.htm

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    Remember to bias the tips of your antenna, and ground it.

    Jefimenko achieved 1/4 hp it would be interesting to see what you or others achieve using modern materials and different approaches to harvesting the same field.

    As Feynman used to say, attack the problem from a different angle!

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    I plan to try this on the shore with one lead attached to the HV cable, the other grounded in wet sand (can't get closer to earth than that!).

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    Khwartz

    4 years ago on Introduction

    Hello Again, dear brazilero2008.

    After having go though near all comments, still would like to know how much power you get with the motor; what would be its efficiency?

    Cheers.

    1 reply
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    brazilero2008Khwartz

    Reply 4 years ago on Introduction

    I calculated power & efficiency for a similar turbine here: https://www.instructables.com/id/Finishing-Details-for-the-Electrostatic-Turbine-1/.
    Low quality rotor bearings used in this project wasted energy; also, taping the rotor made the surface uneven causing the electrode gap to be too large. (I think of the design as a nice piece of art, despite its poor performance. :>D)

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    WoW !!
    great work.
    Made one. works as per your specs
    thanks.
    (now for some experiments)

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    Edgar

    6 years ago on Introduction

    Good job, as usual.
    Oddly enough, a couple of Brazilian Teachers asked me for ideas for School Projects, going to send them this Link, too! :)