GB2432890A

GB2432890A - Fluid driven electricity generator

Info

Publication number: GB2432890A
Application number: GB0623975A
Authority: GB
Inventors: Ivan Mendez
Original assignee: Individual
Current assignee: Individual
Priority date: 2005-12-02
Filing date: 2006-11-30
Publication date: 2007-06-06
Anticipated expiration: 2026-11-30
Also published as: GB0524592D0; GB2432890B; GB2432889A; GB0623975D0

Abstract

A fluid driven electricity generator comprises a magnetic stator 18 and a rotor assembly, the rotor assembly comprising a rotor cylinder 19 attached around a vertical rotor shaft 10 and which is arranged to rotate within the magnetic stator 18, the generator also comprising rotor blades 24 which act to drive the generator when impacted upon by the fluid in any direction. The generator also comprises cooling means to prevent it from overheating. The rotor cylinder 19 may also be magnetic and may comprise windings and laminated iron plates. Preferably the generator is air (wind) driven. Also disclosed is a vehicle comprising the disclosed electricity generator, the generator being arranged to supply electricity to the vehicle (figures 11 and 12).

Description

A VERTICAL AXIS FLUID GENERATOR DEVICE AND VEHICLE

The present invention relates to fluid powered generators for generating electrical power and vehicles comprising such a device. The use of fluid turbines for the purpose of generating electricity to supply the national grid is well established.

BACKGROUND OF THE INVENTION

In particular, the present invention relates to a uniquely designed vertical axis fluid driven generator that utilises mechanical energy from the fluid stream to rotate the rotor assembly in order to generate electrical power.

For instance, the use of wind turbines for the purpose of generating electricity to supply the national grid is very well established. Wind turbines have also been used to provide electricity to outlying homes, caravans or any housing far from the grid.

All major industrial and developing countries have allocated huge resources towards researching wind turbines. Most of the research efforts have been directed towards producing e.g. better and stronger rotor blades, improved towers, increased gear ratios, better and improved designs of nacelles, brakes, yaw control mechanisms and controllers.

The main reason for its popularity is that the wind power is an environmentally friendly inexhaustible energy resource. It produces no emissions and does not damage the environment. In addition, it improves the public health and produces no waste such as those produced from emissions of conventional power stations and it is free from environmental costs associated with mining, drilling, refining, transportation, etc. Significant efforts have been expended in the siting of wind farms. A large number of wind farms are being sited off shore and are very costly. As the number of turbines in such farms has increased, these farms have proven unpopular with the general public. For example, the general public are loathing wind turbines situated in parks, in streets, near cities, villages, close to homes and in places of natural beauty.

There are two types of wind driven generators, namely those used in Horizontal Axis Wind turbines or Vertical Axis Wind turbines.

In the Horizontal Axis Wind turbines, the mechanical power of the wind acts on a set of rotor blades, generally three, which rotate on a low-speed rotating shaft attached to gears in a gear box which step up the rotation of a high-speed rotating shaft to which the armature is attached. Generators used in these turbines are "off-the-shell" generators, which generally produce sixty cycles AC electricity. All of the important parts in these turbines such as the gear box, low and high speed shafts, generator, controller, brake, yaw drive and yaw motor are housed in a nacelle which sits atop a tower.

For instance, the patent application US 4398096 discloses wind turbines to be placed on rooftops using a wind concentrator, in which the "off-the-shelf' generators are situated outside the wind collector.

A more complex design is explained in the patent application US 4074951, where the turbine is situated on a rotatable turn table with two turbines, side by side, with each spinning in the opposite direction to the other.

The majority of the existing commercial wind turbines are Horizontal Axis Wind turbines.

The disadvantage of this type of wind turbines is that they need to be aligned periodically as the wind changes direction, an operation known as "yawing". This demands a control system, although some machines yaw passively, also called free yaw.

A number of Vertical Axis wind turbine designs have emerged over the years. There are two basic types of vertical axis rotors, the Darrieus type which has curved blades and is designed so that there are no bending forces in the blades due to centrifugal forces.

However, this means that it is more difficult to provide control surfaces for power limitations. The second type of vertical axis wind turbines is the straight-bladed model.

These turbines can overcome the control problem by pivoting the rotor blades so that they can be inclined at an angle to their normal vertical attitude in high winds. The rotor blades do not need in this type of turbines to be rotated towards the wind.

One example of a Vertical Axis wind turbine is disclosed in the German patent application DE 19719114 which is aligned side by side with a wind director focusing the wind Onto the blades.

The most significant disadvantage of the existing Horizontal and Vertical Axis wind turbines, apart from their size, shape and length of rotor blades, is the need to transmit the energy derived from the air stream on the rotor lades along a low-speed rotor shaft and then to a gear system in a gear box. From the gearbox, the energy is transmitted along a high-speed shaft, which supplies the mechanical energy to rotate the generator armature to produce the electricity.

Another disadvantage is the fact that the electricity this produces has to be transmitted over long distances which requires huge expenditures in the provision of high-tension wires, pylons, substations and the high maintenance cost these require. Further, the gearbox, which is essential to stepping up the rotation required for electricity generation, is very heavy and costly.

Other disadvantages are that a significant percentage of the mechanical power of the wind stream and the electricity generated is expended to control parts of the wind turbine such as the yaw mechanism and the brakes to prevent the rotor blades from being damaged in very high winds. Further, the turbines have to be shut down in high wind speeds, above sixty -five miles per hour, because of the potential of the generators overheating at or above those speeds and damage caused to the blades. In all these examples, the generators are highly sensitive to variations in the wind speed.

Most, if not all, of the conventional wind driven generators utilise variations on Horizontal and Vertical Axis Wind Turbines which are connected to generators which feed the resultant power output from the generators to batteries. These are "off-the-shelf" generators.

Both of the Horizontal and Vertical Wind turbines may be linked via rotor shafts and gears to generators. These generators are known as constant speed generators. This type of generators is noisy and has a high percentage of wear and tear on the moving parts. The rotor has to be kept at a constant speed, which cannot be increased once the turbine is producing maximum power.

In most of the above mentioned examples of conventional wind driven turbines, controls have to be incorporated in turbine designs in order to solve particular problems such as the need to slow or stop the rotor to prevent wind gusts from suddenly producing too much power in order to prevent the turbine from vibrating during operation and to reduce damage from turbulent winds.

Moreover, the energy derived from the wind acting on the "wind turbine" is not fully utilised as a significant percentage of that energy is used to power the rotor blades, the low-speed and high -speed shafts, gears, yaw mechanism and motor, the controller and the armature of the generator. Normally, the controller is the mechanism which starts up the turbines at wind speeds between eight and sixteen miles per hour and shuts them down when the wind speed between is over sixty-five miles per hour so a high percentage of this wind energy is lost through spillage around the turbine blades.

When theoretically it is possible to extract a maximum of over 59.3 % of the power in the wind, in practice the power extraction is normally not greater than 40% and sometimes even as low as 10%. In comparison, an internal combustion engine has only 24 to 25% efficiency depending on whether it is gasoline or diesel fuelled.

Accordingly, the present invention is designed to overcome all of the above-mentioned problems and to achieve a higher percentage of the maximum potential extraction of the power than those presently achieved.

SUMMARY OF THE INVENTION

According to the first embodiment of the present invention, there is provided a fluid driven variable-speed generator for providing electricity comprising a stationary part having a magnetic stator and a moving part having a rotor assembly; the rotor assembly is configured to spin inside the magnetic stator with a clearance and comprises a rotor cylinder attached around a vertical rotor shaft; rotor blades exposed to fluid stream and supported by supporting means; and a cooling means for cooling the generator to avoid overheating; where the generator is driven by the fluid stream impacting on the rotor blades from any direction.

This fluid driven variable speed generator can respond to wide variations in the fluid stream speed. It can keep operating and maintain maximum efficiency irrespective of fluid stream speed as the rotor assembly is free to spin as fast as the fluid stream can power it.

In the above embodiment, all the mechanical power derived from the fluid stream, which interfaces with the rotor blades, is utilised directly in electricity production, which is provided at very low rotational speeds.

Since the above-mentioned generator consists mainly of a magnetic stator and a rotor assembly, the remaining parts are stationary and designed to provide stability for the moving part and the stationary part. Therefore, this embodiment of the present invention is not attached to an external generator, namely a "stand alone generator".

Unlike the generators in the prior art where the turbine blades are exposed to the elements, all of the components of this embodiment including rotor blades are protected from the elements and placed within the generator unit.

The rotor blades of this embodiment is exposed to the fluid stream due to the variable pitch alignment of the rotor blades on the supporting means.

Further, in order to maintain the temperature necessary for optimising the efficiency of the generator of the present invention, cooling means such as air ducts are located on the supporting means. This cooling means also contributes to decrease the weight of the rotor assembly so that less air power is required to rotate it.

Preferably, the magnetic stator is a magnetic cylinder. In order to maximize electricity production, the magnetic stator cylinder does not come into contact with the rotor cylinder or the supporting means. The clearance between these parts allows unimpeded rotation of the rotor assembly.

Preferably, the rotor cylinder includes windings and laminated iron plates.

Preferably, the rotor assembly further includes slip rings attached to the rotor shaft The rotor cylinder is fused around the shall, which is bonded to a rotor assembly support plate.

Preferably, the fluid is air, and the supporting means comprises a rotor blades upper support disc, a rotor blades support cylinder and a rotor assembly support plate. The rotor assembly support plate may be bonded to the rotor blades, the rotor blades support cylinder and the rotor shaft.

Preferably, the slip rings, rotor shaft, rotor cylinder, rotor blades, rotor blades support cylinder, rotor blades upper support disc form one complete unit, the rotor assembly.

According to the second embodiment of the present invention, there is provided an electrical driven vehicle comprising the wind driven generator described above for providing electrical energy to the vehicle.

The electrical driven vehicle further comprising an air compressing system, which concentrates air stream flow resulting from the forward motion of the vehicle into a jet stream acting directly on the rotor blades and causing the rotor assembly to rotate.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a detailed view of the generator of the present invention.

FIG. 2 is a closer view of Fig 1.

FIG. 3 is a cross-section of the generator.

FIG 4 shows a perspective view of the generator.

FIG. 5 shows a detailed view of the rotor assembly.

FIG.6 shows a detailed view of the rotor cylinder.

FIG.7 shows a detailed view of the rotor blades assembly.

FIG.8 shows a detailed view of the stator magnetic cylinder.

FIG.9 shows a detailed view of the stator assembly.

FIG. 10 is a view of one of the applications of the generator e.g. on a building.

FIG. 11 shows a view of the second embodiment of the present invention.

FIG 12 shows a side elevation of the second embodiment.

FIG 13 shows a view of air siream flow through the vehicle from compressor to exhaust.

FIG 14 shows view of the air compressor, air filter, air compressor throat, rotor blades, rotor blades support cylinder and the air heating chamber.

DESCRIPTION OF THE PREFERRED EMBODIMENTS

Below, preferred embodiments of the present invention are explained with reference to the accompanying drawings.

The first embodiment of the present invention, which is an air-cooled vertical axis wind driven generator, is illustrated in FIG. 1.

In the present invention, the vertical axis wind powered generator has two principal parts, the rotor and stator assemblies Figs. 5 &. 9. They are located in the generator chamber, which is contained in the generator housing I, FIGS. I & 4. The generator housing has a cylindrical shape with a lid 2, and a base 34, FIGS. I & 3. When the generator is located on a building FIG. 10, or in open spaces it is protected from the elements in an open sided house 37 with a roof 38. When installed in a vehicle FIG. 11, the generator is covered by a generator bonnet 39, to protect it from the elements, which can be opened to gain access for servicing and maintenance purposes by the operator.

In the embodiment shown in FIG 1, all of the parts of the vertical axis wind driven generator including the rotor and stator assemblies are contained within the generator housing, which comprises the side 1, lid 2 and the base 34. Securing screws 6 and 35 seal the lid 2 and base 34 to the side 1 thus forms a complete unit. The basic principle of this embodiment is that it generates electricity as the rotor cylinder 79 revolves within the stator magnetic cylinder 78, it cuts through its electromagnetic field and produces alternating current. The electrical energy, the electromagnetic force, is thus produced in the rotor cylinder and, therefore, the current which flows through its windings 21 is transmitted to the slip rings 12, then the brushes 11, and along the conductors attached to the brushes 11 through the slots 6, in the lid 2, FIG.3, for distribution to where the electrical power load is required, e.g. a battery.

in order for the generator rotor assembly to rotate and commence producing electricity, the minimum mechanical power required from the prime mover, air, has to be equal to the "rotor assembly mass" plus what is necessary to provide minimum "rotor assembly speed" at which the rotor cylinder revolves within the stator magnetic cylinder and begins to produce electricity. The rotor assembly mass (RAM) + rotor assembly speed (RAS) = minimum air speed (MAS). The weight of the rotor assembly, dependent upon the design, materials used and generator size, should be as light weight as possible.

It is to be anticipated that the design and size of this embodiment would alter as its condition of use and its function change and improvements in materials used in its manufacture develops.

Before this embodiment is positioned in any given location research should be conducted over a period at the intended site to ascertain the minimum wind speed for that site and its suitability in providing the minimum air speed (MAS) required to rotate the rotor assembly in order to generate electricity, the design rotational speed.

In FIGS I &3 a rotor plate assembly unit rotates on its axis, a rotor shaft 10, as the air stream impacts on the rotor blades 24. The weight of the rotor assembly should be as light as possible so the minimum air speed (MAS) required to rotate it and generate electricity is low.

The rotor assembly including the rotor shaft.10 is supported and held in a fixed position relative to the stator by two bearings; the upper bearing 9, and lower bearing 32, FIGS. 1 & 2, to which it is bonded. The rotor assembly support plate 30 is bonded to the rotor shaft 10. The rotor assembly revolves on its vertical axis, the rotor shaft 10.

The two ends of the rotor shaft 11, which are bonded to the bearings brace are situated in wells 7 & 33 in the upper 8 and lower 32 rotor bearings support blocks. The rotor shaft bonded to brace is thus free to rotate.

The generated output is picked up from the slip rings 12, via the brushes 11 and then conducted through slots 6 in the lid 2, to the various loads on the outside of the generator.

When installed in the vehicle in Fig. 11, the electrical energy is stored in various battery banks, which power the drive motor.

FIG 4 shows a rotor cylinder 19, which rotates within the stator magnetic cylinder 18. The stator magnetic cylinder 18, surrounds the rotor cylinder 19, FIGS. 1 & 4. The stator support plate 14, is fixed at the top of the magnetic cylinder 18 by securing screws 16 to prevent any movement of the magnetic cylinder 18. The stator support plate 14 is fixed to the wall of the generator housing 1, by securing screws 15, and is given added support by resting on the stator support plate rib 17, which is itself bonded to the housing of the generator. Although the rotor cylinder 19 occupies the space within the stator magnetic cylinder 18 in order to provide the maximum generated electrical output, the clearance 22, between the rotor cylinder and the inner wall of the stator cylinder should be.as small as possible.

The clearance 22 between the rotor cylinder and the magnetic stator cylinder 18 separate these two principal parts of the generator, thus enabling the rotor cylinder to spin freely within the magnetic stator cylinder 18. The rotor cylinder's circumference is influenced by the need to maximise the electromagnetic force and, therefore, the current induced in the rotor cylinder as a result of its rotation within the magnetic stator cylinder.

The rotor cylinder 19 is made from a laminated iron core 20 and copper windings 21. The rotor blades 24, the rotor blades support cylinder 25, the rotor blades upper support disc 23, the rotor assembly support plate 30, are formed from lightweight, durable and strong materials capable of withstanding the forces exerted by the air stream on the blades necessary to spin the rotor assembly in order to produce electricity.

FIG.5 shows the rotor assembly unit including the wind-engaging parts of the wind generator; the rotor blades 24, rotor blades support cylinder 25 rotor blades upper support disc 23, rotor or rotor cylinder 19 comprising the laminated iron stack core 20 and rotor windings 21, rotor cylinder lower support disc 28, rotor shaft 10, slip rings 12, and the rotor assembly support plate 30. The rotor assembly support plate 30 is bonded to the rotor blades 24, the rotor blades support cylinder 25, and the rotor shaft 10.

The air acting upon the rotor blades should be clean and free from any foreign matter such as debris, insects, heavy dust particles, snow, rain, grit, which can impede the smooth rotation of the rotor assembly and thus the efficiency of the generator. The air stream is filtered through an air filter before it comes in contact with the rotor blades. The air filter is removable and washable and could be made form a very fine wire or nylon type mesh. When it is installed in on e.g. buildings, the air filter is stretched across the support frame around the generator house. In application where an air compressor is used, the air is forced through a removable for cleaning purposes, an air filter before it becomes concentrated through the air compressor throat, which acts as a nozzle, into a high power air jet stream.

The rotor blades 24 are bonded to the rotor blades support cylinder 25, the rotor blades upper support disc 23 and the rotor assembly support plate 30. The rotor shaft 10 is fused to the rotor cylinder 19, slip rings 12, rotor assembly support plate 30, and the brace of the upper 9, and lower 32, bearings.

The fixing of the rotor shaft 10 in position by the upper bearing support block 8 and the lower bearing support block 31 prevents lateral movement and minimizes oscillation of the rotor assembly as it rotates. The oscillation tolerance of the rotor cylinder is calibrated so as not to exceed the clearance 21 between rotor and stator cylinders. Thus the rotor cylinder is fixed in such a manner so as to remain in position against centrifugal forces and locked against radial movement while allowing slight relative axial movement.

The stator magnetic cylinder 18 in FIG.8 comprises a mild steel cylinder to which magnets are bonded to its inside surface. The type of magnetic material used in forming the stator would be dependant upon its cost. Rear earth magnets, neodymium, are considered to be best suited for the purpose of this example.

The stator magnetic cylinder 18 is held in position and suspended by the stator support plate 14. It has clearances 22 between the rotor cylinder 19 on its inside, 26 between the rotor blades support cylinder 25 on its outside and 29 the rotor assembly support plate, FIGS. 1&3. The stator magnetic cylinder, therefore, cannot impede the free rotation of the rotor assembly.

A clearance 27 between the rotor blades 24 and the generator housing 1 is such so as to minimize air spillage around the rotor blades 24. This is for instance illustrated in FIG. 11, showing the position of the generator 40 in relation to the air jet stream 41 emanating from the air compressor throat 42.

This is only an example of the design of the present invention as it can be designed and adapted easily to suit different applications and situations and customer specifications. For example, the rotor blades can be designed to fit on the outside of the generator housing when it is to be installed in liquid streams. The generator can be sited offshore, installed in sailing crafts, aeroplanes and placed in streams, rivers, ocean currents and operated by the tides, etc. The highest level of aesthetic quality in the design of the generator is another aspect of this present invention.

in accordance with the second embodiment of the present invention, an electrically powered vehicle 1, with the vertical axis wind driven generator 52 described above, includes a body 13 mounted on wheels 35. The vehicle can be either a front or a rear wheel drive is illustrated in FIGS. 1I&12.

In this embodiment to gain access to the interior of the vehicle the operator has to place a personal identification card in the personal identification card slot which is in the key pad 44 located on the central support stanchion 43 on the operator' side of the vehicle, FIGS 11 & 12. Once the card has been verified, the operator enters the operator's personal identification number. When the correct PIN number has been entered, entry to the vehicle can be gained. Use of the wrong card or failure to enter the correct PIN number would result in the total shutdown of all the electrical systems; the card will not be returned, no entry could be gained and the vehicle cannot be driven.

The vehicle has all the modem safety and luxury features including, for example; air bags, anti-lock breaking system, electric door locks, power windows, de-icing, defogger, headlights, entertainment systems, etc. In the present embodiment, the vertical axis air driven generator 52, FIG. I &l I is located at the top of the vehicle in the generator chamber 36, which is covered by a generator bonnet 6. The bonnet 6 can be opened by the operator to gain easy access to the generator and the top battery storage area 12. When closed the bonnet 6 forms a homogenous whole with the air compressor 3 to form a sealed unit, which protects the generator 52 from the elements and is uniform with the general aesthetic design of the vehicle.

A number of battery banks of 12 Volt batteries are located in the vehicle battery storage areas 12, FIG. 11 & 13. The battery banks can be located throughout (he vehicle, for example, under the rear seat and in the boot, and can be made in varying shapes to fit into fit specific areas.

The entire wiring system, not shown, for the wind powered electric vehicle is conducted through insulated wiring conduits, which are situated, for the most part, away from the passenger compartment and where the circuits can be easily maintained.

The air compressor 3 is located at the front and top of the vehicle. Its length conforms to the width of the vehicle; its height is dependant on that of the rotor blades 8 and its depth on the vehicles' design. The vehicle air compressor 3 is concave in shape and has in its centre an air filter 4 and an air compressor throat 5, which acts as a nozzle. The compressor throat has a lip 39 through which the air stream exits to act on the rotor blades.

The compressor throat 5 tapers towards the rotor blades 8 and its height corresponds to that of the rotor blades 8. The air compressor lip 39 interfaces directly with the rotor blades 8, FIGS. 11 & 14.

Occupying the full width of the vehicle, the air compressor 3 compresses the air stream 1 7 channelled to it via the air guide 2, FIG. 11. The angle of fetch at the front of the vehicle, as suggested by the air guide 2, is best illustrated in FIG.12. The compressed air stream 1 7 is scrubbed clean from foreign matter by the air filter 4 and is compressed further in the air compressor throat 5 where it emerges into the generator chamber 36 as a high powered jet stream from the air compressor throat lip 39 to interface directly with the rotor blades 8 of the generator, FIGS. 11 & 14.

In FIG 13 & 14, the rotation of the generator transports the body of air contained within the rotor blades outlet towards the interconnecting heating chamber 14, where it combines with the spent air form the air cooling ducts 23 to undergo further expansion and compression before it emerges as a re-energised air stream to be applied as the motive power for the second generator.

The air stream 17 having been applied to the rotor in the second generator chamber 36 is then expelled through the air exhaust 9, FIGS 11 and 13, at the rear of the vehicle into the outside atmosphere where it expands creating a low negative pressure area which acts as an "air suction". The air pressure differential between the outside rear of the vehicle at the air exhaust 9 and the internal generator chambers 36 results in a force similar to aereodynamic lift. Since the rotor blades of the generator are constrained to move in a vertical plane with the rotor shaft 11 at its centre, the lift force causes rotation about the rotor shaft. Thus this negative low pressure area at the rear of the vehicle, acting as an air suction, contributes further to the speed of the air stream flowing through the generator chambers and improves the rotor blades performance.

The above-mentioned embodiments can be scaled up or down. Various electrical conducting materials can be used. The design of the vehicle can influence the product and manufactured to customer choice.

The examples of this present invention are, therefore, subject to variations, modifications, and alterations as to detail. It is designed to be easily manufactured, having only one moving part, the rotor assembly,and at an economical cost. It can be assembled without difficulty, requires low maintenance and service charges should be minimal. The wind driven generator of the present invention is user friendly and it is conceived with a very high aesthetic value so as not to offend the sensibilities of the general public.

It should be appreciated that the specific form of this present invention, as described and illustrated, is representative only as certain alterations and adaptations can be made during manufacture without departing from its simple description and ethical principle. Therefore, all subject matter described above and illustrated in the accompanying drawings should be interpreted as descriptive only and not limiting in any sense.

Claims

CLAIMS

What is claimed is: 1. A fluid driven variable-speed generator for providing electricity comprising: a stationary part having a magnetic stator and a moving part having a rotor assembly; the rotor assembly is configured to spin inside the magnetic stator with a clearance and comprises a rotor cylinder attached around a vertical rotor shaft; *rotor blades exposed to fluid stream and supported by supporting means; and a cooling means for cooling the generator to avoid overheating; where the generator is driven by the fluid stream impacting on the rotor blades from any direction.

2. The fluid driven variable-speed generator according to claim 1, wherein the rotor stator is a magnetic cylinder.

3. The fluid driven variable-speed generator according to claim 2, wherein the magnetic cylinder comprises windings and laminated iron plates.

4. The fluid driven variable-speed generator according to any of the previous claims, wherein the rotor assembly further comprises slip rings attached to the rotor shaft.

5. The fluid driven variable-speed generator according to any of the previous claims, wherein the supporting means comprises a rotor blades upper support disc, a rotor blades support cylinder and a rotor assembly support plate.

6. The fluid driven variable-speed generator according to claim 5, wherein the rotor assembly support plate is bonded to the rotor blades, the rotor blades support cylinder and rotor shaft.

7. The fluid driven variable-speed generator according to any of the previous claims, wherein the fluid is air.

8. A wind driven variable-speed generator as substantially herein described with reference to the accompanying drawings.

9. An electrical driven vehicle compriing the fluid driven variable-speed generator according to claim 7 for providing electrical energy to the vehicle.

10. The electrical driven vehicle according to claim 9 further comprising an air compressing system which concentrates air stream flow resulting from the forward motion of the vehicle into a jet stream acting directly on the rotor blades and causing the rotor assembly to rotate.

II. An electrical driven vehicle as substantially herein described with reference to the accompanying drawings. ..

Amendments to the claims have been filed as follows What is claimed is: 1. A fluid driven variable-speed generator for providing electricity comprising: a stationary part having a magnetic cylinder and a moving part having a rotor assembly; the rotor assembly having a rotor cylinder attached around a vertical rotor shaft which is configured to spin inside the magnetic cylinder with a clearance; rotor blades exposed to fluid stream and supported by supporting means; the generator is driven by the fluid stream impacting on the rotor blades from any direction; and a cooling means for cooling the generator to avoid overheating; wherein the rotor cylinder comprises windings and laminated iron plates and the magnetic cylinder consists of a non-magnetic material. S..

2. The fluid driven variable-speed generator according to Claim 1, wherein the magnetic cylinder is made of steel and is bonded by magnets to its inside surface. I..

* *. 3. The fluid driven variable-speed generator according to any of the previous claims wherein the rotor assembly further * comprises slip rings attached to the rotor shaft.

4. The fluid driven variable-speed generator according to any of the previous claims, wherein the supporting means comprises a rotor blades upper support disc, a rotor blades support cylinder and a rotor assembly support plate.

5. The fluid driven variable-speed generator according to Claim 4, wherein the rotor assembly support plate is bonded to the rotor blades, the rotor blades support cylinder and rotor shaft.

6. The fluid driven variable-speed generator according to any of the previous claims, wherein the fluid is air.

7. A wind driven variable-speed generator as substantially herein described with reference to the accompanying drawings.

8. An electrical driven vehicle comprising the fluid driven variable-speed generator according to Claim 6 for providing electrical energy to the vehicle.

9. The electrical driven vehicle according to Claim 8 further comprising an air compressing system which concentrates air stream flow resulting from the forward motion of the vehicle into a jet stream acting directly on the rotor blades and causing the rotor assembly to Se.

* rotate.

S *CSe

10. An electrical driven vehicle as substantially herein described with reference to the accompanying drawings. * S. * . S S.. S ** S *. * S.