GREEN ENGINE PROJECT




IN THREE STAGES :

1) keeping the current in-line configuration of a wind turbine and inserting just ONE moving part between the propeller shaft and the generator shaft, achieving an overall transmission ratio 1:150

2) keeping only the propeller shaft and the brakes on the rotating nacelle and relocating the generator on the top of the stationary tower, inserting just FOUR moving parts between the propeller shaft and the generator shaft and achieving an overall transmission ratio 1:150

3) continuing the Stage 2 by relocating the generator as far from the top of the tower as to achieve the optimal situation for construction, installation and maintenance costs and overall efficiency



ELEUTHERO ON WIND TURBINE



ELEUTHERO ON WIND TURBINE





SYNISON , a Hellenic (Greek) Laboratory has developed TWO INNOVATIVE MECHANISMS:

The first of them, named "EXTREME" (EXtreme Transmission Ratio Efficient MEchanism) for the convenience of this presentation, refers to a Mechanism that transmits power with a very high transmission ratio*, inserting ONE only additional moving part between its input and its output, while the patent application for it has already been published with the publication number: WO/2021/165707, receiving an excellent search report and written opinion.

WO/2021/165707 - Front Page

* transmission ratios of the level of 1:10,000 for speed reduction is a really quite easy situation, while for speed increasing there is the need of further research and development for structural details, for transmission ratios much higher than 1:100.

MORE FOR THIS AMAZING DIGITIZED DIFFERENTIAL WINCH: EXTREME


However, the GREAT CHALLENGE is the second Mechanism, named "ELEUTHERO" ("ELEUTHERO-STROPHE", that means an independently rotating hub, is the proposed full name for this brand new Mechanism) for the convenience of this presentation, referring to a configuration which transmits endless rotation from a shaft onto a stationary frame to a shaft onto an endlessly rotating carrier, or vice versa, PURELY MECHANICALLY and INDEPENDENTLY (KINEMATICALLY and DYNAMICALLY) of the rotation of the carrier, inserting THREE only additional moving parts between its input and its output.

The patent application for this Mechanism has just been published with the publication number: WO/2021/260400, receiving an excellent search report and written opinion, as well.

WO/2021/260400 - Front Page

In order to understand the operation of this Mechanism, one has to imagine how the adjustment of the propeller pitch for a helicopter take place.
The crucial differences are that for the "ELEUTHERO" there are robust gears in a planar arrangement, instead of delicate rods in a spatial arrangement for the helicopter, and the adjustment stroke for the helicopter is finite, while all the angular strokes are endless for the "ELEUTHERO".
The configuration is such as to allow an isolated rotation of the carrier and an isolated rotation of a shaft onto the carrier: these two different rotations are absolutely independent with respect to each other, exactly as it happens for the helicopter mechanism.
Besides, there is an unexpected bonus: since a subtraction takes place between the two rotations, the signs of the torques due to the friction are opposite and since the difference of the diameters of the larger gear and the smaller one is very small, the "undesired" torque due to the friction is a very small, also, portion of the transmitted torque, while with a special construction -high precision, special coatings etc- can be literally negligible.

The "ELEUTHERO" has a similar structural concept as the "EXTREME" and -which is more important- it can be perfectly combined with it, so as to achieve an INDEPENDENT POWER TRANSMISSION with a VERY HIGH TRANSMISSION RATIO.

So, one can just imagine a wind turbine where there is a purely mechanical mechanism, which -independently of the rotation of the nacelle- transmits power, with a very high transmission ratio, directly from the propeller shaft to a generator shaft which stands onto the stationary tower, on its top or even on its base; and this is a result of using FOUR only additional moving parts between the propeller shaft and the generator shaft.

The relocation of the gearbox and the electric generator from the rotating nacelle to the stationary tower, even at its top, lowers the costs of construction, installation and maintenance, allowing the approach for inspection and maintenance to the majority of the components of the whole configuration, even without stopping the operation of the wind turbine.

Besides these, the nacelle, having only the propeller shaft and its brakes, can be aerodynamically shaped in the best way, lowering the horizontal wind force onto the top of the stationary tower to the minimum possible.

However, a significant advantage is the deliverance from the "too complicated and too inefficient 'cable unwinding' technique" or the traditional slip-rings and the other components for the transmission of the electric power from the rotating nacelle to the stationary tower.

THE NACELLE IS FREE TO ROTATE ENDLESSLY WITHOUT SLIP-RINGS AND OTHER RELATED COMPONENTS.


The objection to such a proposal is usually summarized in the following three points:

a) the simplest way to transmit power from the rotating nacelle to the ground is to use an electric cable,

b) there is no a mechanical mechanism for this transmission, which is simple, efficient and of low construction cost, and

c) even if the above reasons were not met, the weight of the gearbox and the generator is required to balance the weight of the propeller shaft with the blades and the wind forces.

The first point is refuted by a careful study of what is required for the transmission of electrical power from a rotating frame to a stationary one:
a too complicated and too inefficient "cable unwinding" technique that "sometimes forces the nacelle to oscillate as if it was drunk" or the traditional slip-rings and other components, their lifespan and the ease or not of their replacement.

The third point appears to be the strongest to date, but with the advent of the wind turbine type with direct drive technology (Siemens Gamesa for example), it is obvious that it does not exist in substance.
There is also another way to compensate for the weight of the propeller shaft with the blades, such as the one proposed mainly by Air Genesis.

The second point was probably reinforced by persistently repeated proposals such as TWI572779 or even JP3157729.

However, a brand new Mechanism, the "ELEUTHERO", is now coming to the fore, to overturn this point, while the introduction of this Mechanism is a major breakthrough in the core of the operation of a wind turbine, turning the evolution path of its design to a totally new direction, resulting in the next generation of wind turbines.

In this first phase the proposal is to relocate the speed increaser and the electric generator on the top of the stationary tower; however, for the power transmission, mechanically, from the top to the base of the tower of the wind turbine, except the classic full-section long marine propeller shaft, today there are also solid but more sophisticated, light and yet strong structures, while the vertical direction of transmission (comparing with the horizontal one in the case of a marine transmission) facilitates the situation.

There are already fully operational Prototypes for both Mechanisms, in scale.
However, in close collaboration with the National Technical University of Athens , a Project is running for:
- the designing (being in the last stage) and construction of a fully operational Prototype, where power is transmitted from the propeller shaft, onto the rotating nacelle, to the shaft of an electric generator, onto the stationary tower, independently of the endless rotation of the nacelle, with an overall transmission ratio 1:150, using FOUR only additional moving parts and -what is very important, as well- using STANDARD GEARS only,
- the standardization of all critical parameters involved in the configuration of all the proposed wind turbines, while the final goal is to be these configurations the standard references for the wind turbines of the next generation.



Beyond the just described application on wind turbines, there are plenty of other applications, while examples for the most significant ones are:



APPLICATION ON A TURRET-CARRYING VEHICLE


- on a turret-carrying excavator or a crane or a battle tank, in order to transmit endless rotation from the chassis to the turret independently of the rotation of the turret; among the many advantages of having the engine on the chassis and the hydraulic pump on the turret, is the pure mechanical transmission for the movement of the vehicle, per se, in space, instead of the hydraulic transmission currently in use, the unlimited (purely endless) rotation of the turret with respect to the chassis and the lowering of the center of gravity:

ELEUTHERO ON EXCAVATOR



ELEUTHERO ON EXCAVATOR

MORE FOR THE APPLICATION ON A TURRET-CARRYING VEHICLE




APPLICATION ON A STEERING BRACKET OF A VEHICLE


- on the steering bracket of a vehicle; and it is obvious what a wild thing is A WHEEL THAT PROPELS AND STEERS at the same time (via robust gears instead of the delicate balls of the current constant-velocity joint) for any vehicle, especially for a 8x8x8 or 6x6x6 military or fire-fighting vehicle with very high ground clearance, or even for a 4x4x2 SUV or super-car or a simple 4x2x2 family or smaller car:

ELEUTHERO ON VEHICLE



ELEUTHERO ON VEHICLE

MORE FOR THE APPLICATION ON A STEERING BRACKET OF A VEHICLE




APPLICATION ON A PROPELLER HUB TO ADJUST THE PROPELLER PITCH


- on the rotating propeller-hub of a helicopter or other propeller-powered craft, on air or water, or even of a wind turbine (see all the related Drawings of the PCT application), in order to adjust their propeller or blade pitch, via the most compact and robust way, even with an endless angular travel of the final actuator with everything which this entails:

ELEUTHERO ON WIND TURBINE: TWIN APPLICATION



ELEUTHERO ON WIND TURBINE: TWIN APPLICATION



APPLICATION ON A ROBOT TO TRANSMIT POWER FROM AN ARM TO THE NEXT ONE


- on the arms of a robot: for example, on the first arm in order to transmit power from the base to the first arm, independently of the rotation of the first arm, on the second arm in order to transmit power from the first arm to the second arm, independently of the rotation of the second arm with respect to the first arm, and so on:

ELEUTHERO ON ROBOTICS





These MECHANISMS are Patent Pending
and until the next phase of their publication this website is under construction;
so, if you want more information, please, write directly to the address:

GREEN ENGINE PROJECT







SYN ISON Laboratory



National Motor Company International AG



Institute of Mechanics of Materials & Geostructures SA



National Technical University of Athens



PHASE MORPHING MECHANISM and APPLICATIONS



TRISKELION BICYCLE MECHANISM



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