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Directory:Gemini Electric Motor

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Inventor John Patrick Ettridge says Gemini Electric Motor -- though not a purely magnetic motor, nor an over unity motor -- has the potential to greatly improve the conventional electric motor.

"Most people see my invention as two motors in one. The motor can work with just one of the rings of magnets, but when both rings are used, it does not draw any additional electric current, but produces more torque or power."

See Directory:Ettridge Wind Turbine


Official Websites

How does it work?

Stage of development 25 - 30 pre-production prototypes built.

Monday, August 23, 2004; Australia:

"I have had working prototypes for the last three and a half years. back then I was happy to have them revolving at about 400 r.p.m.using 12 volts. Then about three years ago I had them working at 1000 r.p.m. using 12 volts, and they have steadily increased r.p.m. the latest ones have achieved 2400 r.p.m. on 12 volts, and I have had them at over 6000 r.p.m. on 36 volts. the motor dimensions are 220mm out side diameter by 100mm wide. I have 25 -30 motors, all with slightly different windings. I even have them with rare earth magnets, the specially curved magnets. I had the early motors run for one hour on a 12 volt 7 amp hour battery, not under load. I have not tested them in the normal manner as the motors are still continuing to improve, as the commutator is refined. I have tested them on a bike, with speeds of 27 km per hour, and they will move off from a standing start with out assistance. The motor is getting very close to a production prototype, at which time proper testing data will be taken, and you can post that information." John Patrick Ettridge, Inventor

Gemini electric motor by John Patrick Ettridge
Gemini electric motor by John Patrick Ettridge
Quoting from their home page:

Gemini Motor "The GEMINI produces optimum rotational power and torque by using BOTH sides of the energised coil, and it does so without consuming any additional energy.

"The GEMINI achieves its outstanding performance by providing in its ingenious design of three separate energy fields; Two fields contribute to rotational power and torque, while the third produces independent electricity from normally unused electromagnetic fields within the motor.

"The electricity generated by this third field could be used to recharge the GEMINI's battery power source or be fed back into the motor, thus reducing the energy demand from the power source. On electric vehicles this additional power generation could be used to run devices such as lights and horns."

Figure 2 from the patent illustrates the H-shaped stator instead of the usual T shape. Thus both ends of an energized coil impart motion to the rotor section.


list here

Additional Details

Figure 1
Figure 1

The following information was received by e-mail from the inventor in December 2006:

Announcing the discovery of a new magnet phenomenon, we have all learnt that like magnetic poles repel each other, and that unlike magnetic poles attract each other. This new discovery caught my interest as like many inventors from around the world the thought of making a magnetic motor using permanent magnets, and no electricity or batteries has taken up a lot of my time. I do not use those horrible words, " perpetual motion ", as the source would be a known force, namely magnetism. The discovery in 2002, that there is a particular configuration where two unlike magnetic poles will repel each other, and not the usual attract each other, was made by Mr. Washington Lucero, originally from Colombia South America, but who has lived in New York, U.S.A. for the last 23 years. He described a simple experiment to prove his discovery.

"You require two 1" (25mm) diameter or square magnet, with 0.250" (4mm) thickness with the magnetic flux through the thickness. The experiment works better if neodymium magnets are used. On a shiny smooth flat surface, put one magnet with the "North" pole facing up. Either side of this magnet, and about 6" from the magnet put a pencil. Position a flat ruler across the top of the pencils, over the magnet. Place the second magnet on top of either end of the ruler with the "South" pole facing down. There should be a gap between the bottom magnet and the ruler to allow it to move, Figure 1.

Figure 2
Figure 2

Slowly move the top magnet towards the bottom magnet. You would expect that as opposite magnetic poles attract, the two magnets would come together, but the opposite occurs, the bottom magnet is repelled. Why? Sure if you stop the bottom magnet from moving, there is a point that it will be attracted to the top magnet. In case you are thinking it is the ruler stopping the bottom magnet from flipping, the same experiment works if you place the top magnet on a rubber, no pencils or ruler, and move it towards the bottom magnet, it will initially repel the bottom magnet.

Figure 2 shows the magnetic flux lines of the magnets placed in this position. It is now hoped this new discovery with unconventional magnetic properties will get inventors and those who can think outside the square to come up with a practical application for this discovery. Another unconventional discovery is the Halbach array, which is a special arrangements of permanent magnets that increases the magnetic flux field on one side of the device while reducing the magnetic flux field to near zero on the other side.

Figure 3
Figure 3

This effect was first discovered by Mallinson in 1973, but it was not until the 1980s, that the late Klaus Halbach, a physicist at Lawrence Berkeley National Laboratory, invented the Halbach array to focus accelerator particle beams. Other applications raging from a refrigerator magnet, industrial applications include the brushless AC motor and magnetic couplings, while high-tech applications such as the wiggler magnets are used in particle accelerators, free electron lasers and the Inductrack maglev, which is a levitating train that requires no power to levitate, only electrical power to move forward. Another recent discovery is the movement of magnetic fluxes in the conventional electric motor.

Figure 4
Figure 4

Figure 4 shows the accepted direction of the back EMF ( Electro Magnetic Force ) in a conventional electric motor.

Figure 5
Figure 5

Figure 5 Shows the real direction of the Back EMF in a conventional electric motor.

Figure 6
Figure 6

Figure 6 Shows the magnetic flux lines in opposing same pole magnets, it is clear that the flux lines radiate from the center of the two same pole magnets.

Figure 7
Figure 7

Figure 7 shows the correct magnetic flux lines. This discovery in its simplest form consists of two small stacks of laminations of a suitable steel strip, with a suitable number laminated together (Figure 6), say 20 strips of 0.5mm thick by 25mm wide by 65mm long. The actual dimensions are not critical. These stacks of laminations have two rare earth permanent magnets the dimensions on the cross section of the laminated stack positioned at the ends of one of the laminated stack, again it is not critical to be a rare earth magnet, but it does give better results. The permanent magnets are through magnetized. The second stack of laminations, is positioned at the outer face of the permanent magnet which joins both stacks of laminations. The photo's Figure 5 and Figure 6 with the position of the laminates and magnets superimposed on the photos clearly indicate the arrangement above. The photos also show tiny magnet fragments which have been sprinkled over the magnets and lamination assembly, this arrangement allows that the magnetic flux paths can be seen and tracked. Looking at the photo Figure 5, which shows the permanent magnets with same magnetic poles facing each other, it can be seen that the popular belief that the magnetic flux will travel straight through the laminations and through the other permanent magnet, is in fact wrong. The center of the laminations appears as strong in flux density as the ends. It can also be seen that the magnetic flux paths radiate to the opposite magnetic poles in the permanent magnets. In the other photo Figure 6, showing the permanent magnets, with opposite magnetic poles facing each other, the magnetic flux path is quite different. The magnetic flux path in the center permanent magnet appears as expected, with the magnetic flux lines going from opposite magnetic poles. The big difference is that the magnetic flux lines go right across the laminated piece to the inner facing magnetic pole, ignoring the North, South Magnetic lines rule, as shown by the center magnet.

This is fundamentally important when looking at the drawing Figure 4 of a conventional electric motor. Remembering the magnetic flux path rule, that the path will always be of least line of resistance. In the drawing Figure 4, the direction of the rotation of the rotor is illustrated by arrows close to the center of the rotor. The darker arrows indicate the popular thought of path of the magnetic flux lines. The magnetic poles are indicated by N for North magnetic pole, and S for South magnetic pole. It can be seen by using the magnetic principle the like magnetic poles repel, and unlike magnetic poles attract that all the magnetic poles at the inner ends of the energized coils would be South magnetic poles. The magnetic poles on energized coil number 3. are about to change, but at the stage in the drawing would still be a South magnetic pole. From the photo Figure 4, with the like magnetic poles facing each other, it would suggest that the actual magnetic flux path is through the center of the energized coil 1. then between the energized coils 1. & 2. This would be a radical change in thinking, and can be easily demonstrated by this new apparatus. It would also confirm that the conventional electric motor can not be using both sides of the energized coil effectively, as the inner magnetic pole at the center of the rotor has to travel through a large air gap to complete the magnetic flux lines. While in the Gemini Electric Motor described in the October - November 2004, NEXUS magazine and covered by U.S. patent number US6,812,615 B1 both ends of the energized coil are only an air gap from the permanent magnets in the stator with which they react to produce rotational movement, which explains the very high torque obtained by these electric motors, whilst not consuming any additional electric current.

Patents and Trademarks

  • Site list of Patents and Trademarks
    • PCT applications filed: U.S., European, Chinese, Japanese, British, Australian, Indian
    • Trademarks: Gemini Power, Gemini Energy...
  • International Patent Application number, PCT/AU01/00707, 13 June 2001 (according to separate document by Tim Harwood)


  • Gemini Electric Motor: "Gold Medal for Innovation Excellence" - INPEX; Pittsburgh, U.S.A.; May 2004.
  • Ettridge Commutator: "Gold Medal" - International Exhibition for Inventions and New Products; Geneva, Switzerland; March 2004.

Inventor: John Patrick Ettridge


In the News

  • Featured: Wind > Vertical Axis > Ettridge >
    Ettridge Wind Turbine seeks manufacturer - John Patrick Ettridge has had many inquiries about purchasing and marketing his technology, but he's not had success finding a manufacturer for his vertical axis turbine design that could be cheaper than coal power. It's attributes include low visual impact, pollution-free, negligible noise, wider range of operable wind speeds, no bird kill. (PESWiki; April 13, 2010)
  • Adelaide Electric Motor Invention - "Seen on "Today Tonight" on Channel 7 was a story on John Ettridge from Dovar Gardens who claims he has invented an electric motor that uses half the power of conventional electric motors. The motor was demonstrated on a motorised pushbike that John rode down the street. The motor was built into the hub of the front wheel of the bike and is apparently going to be for sale as an electric motor kit for around $300 from Gemini Motors" (Alternative Science & Technology Research Organisation; June 2001)

Other Coverage

  • A review by Tim Harwood is scheduled for publication in Nexus magazine.
  • An article on the Gemini Electric motor was published in the October- November 2004 Nexus.


See Discussion page


John Patrick Ettridge
John Patrick Ettridge

John Patrick Ettridge
53 Branksome Terrace
Dover Gardens
South Australia 5048
Phone: 61-8-82981698

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