The Steorn magnetic motor replication by JL Naudin
created on december 26, 2009 - JLN Labs - Last update January 5, 2010
Toutes les informations et schémas sont publiés gratuitement ( freeware ) et sont destinés ŕ un usage personnel et non commercial
All informations and diagrams are published freely (freeware) and are intended for a private use and a non commercial use.

Cliquez ici pour la version FRANCAISE

From the informations published on the Internet by Steorn, I have decided to reproduce this magnetic motor and, firstly, to check the observations and measurements presented in the video of December 15, 2009 by Sean McCarthy in Dublin.

1 - Experimental setup :

Regarding the mechanical part, the engine showed by Steorn had its axis of rotation set vertically. In my case, I have chosen to put the axis horizontally, only to simplify the construction. The rotor of the motor consists of 2 wheels, 15 cm diameter, these wheels are made of a plastic rim and a solid rubber tire. The 2 wheels are mounted on an aluminum shaft mounted on two ball bearings. Six holes, 22 mm in diameter and 10 mm deep, were drilled into the tire to contain 6 magnets NdFeB (Bremag 27) of 27 MGOe (208 kJ/m3). Two toroidal coils with ferrite cores are arranged symmetrically on either side and with a 5 mm gap from the rotor. The second wheel behind is not used yet, it will be used later for the generator. (See photos).

Regarding the electronics, I have made a control circuit using a Hall effect sensor Siemens TLE 4905L. This sensor can easily detect the position of the magnet when its leaves the toroidal coil and thus it controls the activation of the magnetic field of depolarization. With this sensor setup, the rotor rotates in counterclockwise (CCW) direction.

The Hall effect sensor controls a N-MOSFET power transistor (BUZ 11) which is in charge to power the 2 toroidal coils connected in series. I used 2 ferrite toroidal cores made by Philips (purple color), reference 4C65-RK190. Outer diameter: 23.6 mm, inner diameter: 13.4 mm, height: 7.6mm. Permeability: 120, specific inductance Al = 87. Each toroidal core is wound with 67 turns of enameled wire of 5/10 mm and has an average inductance of 390 µH. The electronic circuit is powered with a voltage between 9 and 12V. It can also be powered with batteries Lipo 11.1V (3S1P).

About the measurements, I have used a digital oscilloscope Fluke 123, the voltage is measured across the terminals of the coils and the current through a shunt of 0.01 ohm in series with the output transistor of the power control circuit.

2 - Tests results :

The rotation of the engine must be initialized with a small boost with the hand and counter clockwise. The increase of the speed is very surprising and the engine torque is strong. Within minutes the engine speed exceeds 1200 rpm. For security reasons, I added a fiberglass tape around the rotor to prevent a possible ejection of the magnets. The magnets are glued with cyanoacrylate glue in their holes.

Here, a short video of the running and the speed up of the Steorn motor.


I recall that the purpose of this experiment is firstly to check the proper functioning of the Steorn engine and the facts presented in his video of December 15, 2009 :

  1. A reversal of the polarity of the coils does not change the direction of rotation,

  2. When the rotor is manually braked, the supply current in the toroidal coils remains constant,

  3. There is no ElectroMotive Force (EMF) and counter electromotive force (Back EMF) induced in the stator coils when the rotor is turned manually.

Test 1:

Testing the reverse polarity of the coils:

When we reverse the polarity of the supply voltage, the rotor still turns counter clockwise and the speed remains identical.

This fact is confirmed experimentally, see the video below :

Test 2:

Braking the rotor rotation has no influence on the amplitude of the pulse current measured:

Indeed, when the rotor is braked by hand, the current amplitude measured remains constant, this fact is experimentally confirmed.

Test 3 :

There is no counter electromotive force (Back EMF) induced in the stator coils when the rotor is turned manually.

The toroidal coils of the stator are disconnected from the controller and connected directly to the input of the oscilloscope. When the rotor is being quickly rotated manually, there is no electromotive force and no counter electromotive force measured at the output of the coils.

This fact is confirmed experimentally, see the video below:

3 - To summarize

Today, the Steorn engine reproduced here confirms the observations and the measurements submitted on December 15, 2009 by Sean McCarthy in Dublin. This engine, an atypical configuration, is really very interesting and worth to be explored and developed because it presents a characteristic of non-reciprocity of the energy load on the power source through the breaking of the symmetry (regauging effect). Other experiments and tests will soon be conducted to better understand and improve this innovative principle.

Using the potential energy of magnets to produce a clean and free energy is really worth exploring and developing very seriously for the future of our planet ...

A very simple experiment to do...

4 - Recommendations and Improvements

After many successful tests of the replication of the Steorn's motor, it is strongly recommended to increase the number of the turns of the coils to reduce dramatically the required current for saturation of the ferromagnetic toroidal cores.

5 - The new Steorn motor v2 design

According to my comment above, I have decided to rebuild the toroidal coils with more turns so as to reduce dramatically the input current. Click on the picture below for more infos about the V2.

Interesting documents :

Technical datasheets :

Patents :

Email :

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