awarded to 


Details below



The Electric Motor is for either A.C. or D.C. current, and has the choice of a carbon brush on a flat copper commutator        ( which was specially developed for this motor ) and is ideally suited for a D.C. in the Hub Electric Wheel Motor for use on a Bicycle or Electric Car, and is used in area`s where low technical repairs are only available. Or there is an electronic commutator, best suited for stationary applications, where high technical repairs are available. This new electric motor is still being developed, although working prototypes have been made and are being tested, to establish how much more power has been obtained from the use of magnets both sides of the energized coil. This Electric Motor is initially intended for use in the front wheel of a Bicycle, to turn the normal push bike into an electric powered bicycle.
The electric motor will be used in electric cars, washing machines, refrigerators, in fact in any application that now uses a A.C. or D.C. electric motor, and energy consumption reductions are desirable.
Patents have been applied for, and the International Patent Organization`s first World Wide Patent Search has allowed all the main claims for this invention. This invention will make very good use of the improved fuel cells being developed, and enhance the introduction of the electric car and bicycle, because of the greatly increased mileage between battery charges. Ongoing development is bringing exciting improvements in performance every day.
For additional information contact :

In simple terms, to explain this invention : if we look at figure 1. which is the basic electric motor.

Figure 1.

This is made up of "T" shaped arms which are joined at the center. With copper wire wound around the stem of the "T" shape, and connected to a commutator ( which changes the direction of the electrical current ). An electric current is passed through the copper wire creating a north magnetic pole one side of the energized coil, and a south magnetic pole the other side. These magnetic poles alternate as the direction of the electric current is changed. The operation is that when the magnetic pole on the outside of the rotor comes in the vicinity of a magnetic field in the stator ( the outside magnetic casing ) the principle of like magnetic poles repel, and unlike magnetic poles attract comes into play to force the rotor to rotate. It is important to note that the magnetic poles either side of the energized coil are of equal strength, but the magnetic pole the side that forms the center of the rotor can not be used to rotate the rotor. 50% of the potential power of the energized coil is lost.

When we look at figure 2., which is a radial electric motor, again we see that only one side of the energized coil is used to provide rotation of the rotor. 50% of the potential power of the energized coil is lost.

Radial electric motor

Figure 2.

The Ettridge Electric Motor is shown in figure 3. The "T" shape has been changed to a "H" shape, and an additional ring of magnets is positioned on the inside of the "H" shape core, so that both sides of the energized coil are being used to rotate the rotor. 100% of the potential power of the energized coil is used to produce rotational movement of the rotor.

Ettridge Electric Motor

Figure 3.


Patent details.

PCT International application No. PCT/AU 99/00261

International Publication No. WO 99/54990

International Publication Date 28th October 1999.

U.S.A. Continuation-in-part application No.10/187632

European application No. 99913011.5

Chinese Patent No.ZL99805093.8

Japanese application No. 2000-545238

British application No.9906590.6

Australian Patent No.757966

Indian application No.2000/00307/DEL

Other Provisional Patent Applications pending.

Other PCT Applications pending.

Trade Mark applications:

GEMINI ELECTRIC MOTOR. No. 832845 Australia.

GEMINI ENERGY. No.858441. Australia.

GEMINI POWER : #78058533 U.S.A.

Gemini Electric Motor Company Pty. Ltd. is the Development and Marketing Company for this invention.
Marketed as the Gemini Electric Motor
their website is at :



                                   AWARDED to ETTRIDGE COMMUTATOR


At the International Exhibition of Inventions & New Products held in Geneva, Switzerland, from 31st  March to 4th April 2004. There were approximately 1000 Inventions Exhibited, with the GOLD MEDALS being awarded for the best inventions shown.


The Gemini Electric Motor uses three methods of commutation or controllers. The first two are carbon brush systems, and the third uses electronic controllers.

The first system is a flat base carbon brush commutator, this consists of a flat base with copper segments positioned in a circle, with the carbon brushes at 90 degrees to the flat base. The unique feature of this carbon brush system is that a neutral copper segment is positioned between the negatively charged copper segments, and the positively charged segments, so the carbon brushes can not touch both the negative and positive charged segments at the same time. Making it impossible to short the two electrical charges.

The animation below shows two carbon brushes A and B positioned on the flat base. If six energised coils are used, there are three sets of carbon brushes, but the animation only shows two for simplicity.

The inner and outer rings simply take the negative or positive electric current to the center segments, they may act as slip rings in some applications. Below is a picture of an actual flat base with only the center segments.

The carbon brush holder, ensures the carbon brushes are held in the correct positions in relationship to the flat base

The second carbon brush system works on the same principal as the first, but with the carbon brushes arranged radially around the armature. It would appear to be similar to the conventional carbon brush system, except that a neutral segment is positioned between the active negative and positive segments. It is important that the neutral segment is wider that the carbon brushes.

Below is an animation of the carbon brushes arranged radially around the armature.


The third system of commutation is an electronic controller, which electronically switches the electric currents, by use of a hall effect sensor to detect the position of the magnets in relationship to the energised coils. The electronic circuit also controls the speed of the electric motor.

Patent Details.

PCT International Application No. PCT/AU01/00032

International Publication No. WO 01/54235 A1

International Publication date. 26 July 2001.

U.S.A. Patent No.2003090165

British publication No. GB2376810

Australian Application No. 2001226546

Other Ettridge Inventions Check this out.