Vertical axis variable geometry wind energy collection system

• US 20100092290A1
• Filed: 10/11/2008
• Published: 04/15/2010
• Est. Priority Date: 10/11/2008
• Status: Active Grant

• Current Assignee: Michael Scott Aaron
• Original Assignee: Michael Scott Aaron
• Inventors: Aaron, Michael Scott
• Granted Patent: US 8,004,101 B2
• Time in Patent Office: Days
• US Class Current: 416/9
• CPC Class Codes: F03D 13/10 Assembly of wind motors; Arrangements for erecting wind motors
• CPC Class Codes: F03D 3/005 the axis being vertical
• CPC Class Codes: F03D 3/0445 the shield being fixed with respect to the wind motor
• CPC Class Codes: F03D 9/25 the apparatus being an electrical generator F03D9/22 takes precedence
• CPC Class Codes: F05B 2220/7068 equipped with permanent magnets
• CPC Class Codes: F05B 2240/13 to collect or cause flow towards or away from turbines
• CPC Class Codes: Y02E 10/74 Wind turbines with rotation axis perpendicular to the wind direction

Abstract

A device to convert the kinetic energy of wind into kinetic energy in the form of a rotating mass (FIG. 9) and to then selectively harvest and convert the kinetic energy of the rotating mass into electrical energy using both permanent magnet and electromagnet generators (FIG. 33). The conversion of the kinetic energy of wind into mechanical kinetic energy of the rotating mass is maximized through mechanical means by varying the physical moment of inertia of the rotating mass programatically based upon real time sensor data (FIG. 27A,27B). The conversion of the kinetic energy of the rotating mass into electrical energy is maximized through the programatical control of the field coil current of the electromagnet generator based upon real time sensor data (FIG. 62).

Claims

1. A device that transforms the kinetic energy inherent in wind into kinetic energy in the form of mechanical rotation of a mass such that the maximum angular velocity attainable of said rotating mass for a given wind speed is obtained in the minimum time possible through the use of mechanical means comprising:

(a) a rigid shaft anchored to the earth or some fixed structure so that its orientation is such that its longitudinal axis is approximately vertical and having a plurality of cylindrical bearings attached so that the inner races of said bearings are affixed to the shaft with the outer races of said bearings allowed to rotate freely concentrically about the longitudinal axis of the shaft

(b) a hollow cylindrical structure serving as an outer rotor and another hollow cylindrical structure smaller in diameter serving as an inner rotor with the two connected to each other by a plurality of radial support structures serving as spokes between them with the inner rotor being attached to said rigid shaft via connection to a plurality of said outer races of said bearings

(c) a plurality of rigid planar surfaces attached to the outside circumference of the outer rotor to form a plurality of sails which when impacted by incident wind will exert a torque upon the outer rotor tangentially to cause the collective rotating mass of sails, cylinders, spokes, and outer bearing races to rotate about the longitudinal axis of said rigid shaft

(d) a windshield support structure comprised of a pair of identical circular structures with each having an outer circumferential structure connected to an inner hub by plurality of radial support structures serving as spokes between them with both said circular structures arranged so that the planar area bounded by each circle is oriented horizontally with the two structures some distance apart from each other vertically and being joined together with a plurality of vertical support members with the entire assemblage forming a cagelike structure that is attached to said rigid shaft via connection of said inner hubs to a plurality of said outer races of said bearings at points along the rigid shaft to allow the entire assemblage to rotate freely about the longitudinal axis of said rigid shaft independently of said rotating mass

(e) a windshield in the form of a curved planar structure attached to said windshield support structure via a plurality of said vertical support members so that the circular extent of said windshield encompasses 180 degrees of arc and is bounded vertically by the same linear dimension as that of said vertical support members'"'"' longitudinal axes

(f) a directional control structure in the form of a rigid planar surface oriented vertically and attached to one vertical edge of said windshield and extending radially outside of and perpendicular to the circumference of said windshield support structure to such extent necessary so as to provide such force as necessary to keep said windshield in a constant attitude with respect to wind direction so as to allow wind pressure to be applied to only one half the frontal area of said rotating mass that is facing into the wind whereby creating assymetric forces to be applied to said attached sails causing said rotating mass to turn in one direction only

(g) a hollow cylindrical structure forming a duct with the same inner diameter as that of said outer rotor and a length of approximately four times the diameter of said duct with said duct bent in the middle of said length to form a 90 degree elbow with one half of said duct oriented with its longitudinal axis horizontal and the other half of said duct oriented with its longitudinal axis vertical with the top of the vertical portion of said duct connected to the bottom of said windshield support structure via attachments to said windshield support structure radial support structures with the horizontal portion of said duct having a flared funnel attached to its open end with the horizontal portion of said duct connected to said rigid shaft via connection to said outer race such that the entire duct rotates about the longitudinal axis of said rigid shaft in unison with said windshield support structure whereby the open end of the funnel is always pointed into the wind

(h) a plurality of rigid planar structures attached to the outer rotor to inner rotor radial support structures so as to form a plurality of impellor vanes oriented in such a manner so as to provide an additive component of torque to said rotating mass by virtue of the wind being redirected through said funnel and duct and impinging upon said impellor vanes before being exhausted through the open top of said rotating mass.

2. The plurality of sails of claim 1 wherein said sails are formed from the connection of individual rigid planar structures to each other so as to form articulated structures whereby maximum collective surface area is afforded to capture wind energy in one direction of rotation of said rotating mass but in the opposite direction of rotation of said rotating mass the profile of said articulated sails afford relatively minimal collective surface area whereby ensuring through assymetric forces that the rotating mass will always initiate and sustain rotation in one direction only.

3. The plurality of sails of claim 1 wherein said sails are mounted to the structure of said outer rotor in such a manner so as to allow the connecting masts of said sails to pivot radially about their longitudinal axes through an angle determined by physical limits imposed through structural contact with said outer rotor structure whereby allowing said sails to produce a greater torque in one direction of pivot travel and to produce a lesser torque in the opposite direction pivot travel whereby ensuring through assymetric forces that the rotating mass will rotate in one direction only.

4. A device to maximize the transformation of kinetic energy derived from wind into electrical energy by mechanically manipulating physical moments of inertia of a rotating mass to optimum physical positions based upon wind speed values derived from sensor data and through selective harvest of such electrical energy through means of electrically controlling the amount excitation current applied to electromagnets of an electromagnetic generator based upon the available kinetic energy value of rotating mass that is being used as the prime mover of said electromagnetic generator with said kinetic energy value being derived mathematically as the product of the measured rotational velocity of said rotating mass multiplied by the square of the real time calculation of the physical moment of inertia of said rotating mass using means comprising:

(a) a rigid shaft anchored to the earth or some fixed structure so that its orientation is such that its longitudinal axis is approximately vertical and having a plurality of cylindrical bearings attached so that the inner races of said bearings are affixed to said shaft with the outer races of said bearings allowed to rotate freely concentrically about the longitudinal axis of said shaft

(b) a hollow cylindrical structure serving as an outer rotor and another hollow cylindrical structure smaller in diameter serving as an inner rotor with the two connected to each other by a plurality of radial support structures serving as spokes between them with the inner rotor being attached to said rigid shaft via connection to a plurality of said outer races of said bearings

(c) a plurality of rigid planar surfaces attached to the outside circumference of the outer rotor to form a plurality of sails which when impacted by incident wind will exert a torque upon the outer rotor tangentially to cause the collective rotating mass of sails, cylinders, spokes, all components attached to said cylinders, and outer bearing races to rotate about the longitudinal axis of said rigid shaft

(d) a wind speed measuring device capable of providing an electrical output representative of such speed that is compatible to be used as a sensory input to data processing circuitry

(e) a power supply device capable of providing necessary power for electronic circuitry used to power and monitor sensory devices as well as power circuitry used to control electromechanical and electronic regulatory devices

(f) a plurality of devices attached to said radial support structures with each comprised of a mass and mechanical components that position said mass at variable physical positions along the longitudinal axis of said radial support structure with the shifting masses each controlled by their individual electromechanical mechanisms

(g) electronic circuit elements comprising counters, nonvolatile memory devices, a central processing unit, and amplifiers with these elements used to accept as inputs real time wind speed and shifting mass positional data and in turn use predetermined formulae stored in said nonvolatile memory to provide the necessary controls to amplifiers to provide corresponding drive signals to said shifting masses'"'"' electromechanical mechanisms in order to optimize the position of said shifting masses for a given wind speed

(h) an electromagnetic generator comprising a plurality of disklike rotor subassemblies mounted on said inner rotor with a plurality of disklike stator subassemblies mounted on static structures attached to said rigid shaft with said electromagnetic generator stator subassemblies constructed and mounted in such a manner so as to allow mounting of said electromagnetic generator stator subassemblies between said electromagnetic generator rotor subassemblies with no resultant physical interference with said inner rotor'"'"'s rotation about the longitudinal axis of said rigid shaft with each electromagnetic rotor subassembly including a plurality of electromagnets that will create magnetic fields when subjected to electric current flowing through their field coils and with each electromagnetic generator stator subassembly including a plurality of armature windings which when subjected to motion relative to and in close proximity to said magnetic fields will produce an alternating current voltage.

(i) an angular velocity measuring device capable of providing an electrical output representative of angular velocity of said rotating mass that is compatible to be used as a sensory input to data processing circuitry

(j) electronic circuit elements comprising counters, nonvolatile memory devices, a central processing unit, a zero crossing voltage detector, analog-to-digital converters, and amplifiers with these elements used to accept as inputs real time rotating mass angular velocity and shifting mass positional data and in turn use predetermined formulae stored in said memory devices to provide the necessary controls to amplifiers to provide corresponding drive signals to regulate the amount of current flowing through the field coils of said electromagnets in said electromagnetic generator in order to optimize the amount of electrical power harvested for a given amount of kinetic energy produced by said rotating mass

(k) a power supply mounted on said rigid shaft which accepts as input alternating current voltages produced by said electromagnetic generator and in turn rectifies, filters, and regulates these input voltages to produce a direct current voltage as an output to be used to supply external loads.

5. The wind speed sensing device of claim 4 wherein said device is mounted in such a manner so as to be exposed to an airstream devoid of turbulence caused by airflow being deviated by contact with associated structures with said device being comprised of:

(a) a hollow cylindrical structure oriented vertically serving as an anemometer support structure with a photoelectric sensor attached that is comprised of a planar surface emitting some wavelength of light with another planar surface parallel to the other serving to detect said light and capable of producing an electrical signal corresponding to the detection of said light whereby said signal varies in magnitude when some solid object passes between the emitter and detector surfaces

(b) a hollow cylindrical structure oriented vertically serving as an anemometer rotor shaft with a plurality of cylindrical bearings attached so that the inner races of the bearings are affixed to the shaft with the outer races of the bearings allowed to rotate freely concentrically about the longitudinal axis of the shaft

(c) an anemometer rotor structure comprised of a hollow cylindrical structure closed on one end serving as the inner hub of the anemometer rotor structure with a plurality of cuplike structures attached to the outer circumference of the inner hub with a plurality of radial support structures serving as spokes with the orientation of the cuplike structures being such that they have their openings pointed in the same direction circumferentially so that when subjected to wind they will afford physical profiles resulting in assymetric forces being applied to said anemometer rotor structure with the entire anemometer rotor structure mounted on the top end of said anemometer rotor shaft such that when this assemblage is inserted into said anemometer support structure the anemometer rotor shaft and anemometer rotor structure are free to rotate about the longitudinal axis of said anemometer support structure and secured to said anemometer support structure by connection of the outer races of said cylindrical bearings of said anemometer rotor shaft to the inner circumferential surface of said anemometer support structure

(d) a plurality of rectangular standoffs emanating from the inner circumference of said anemometer rotor inner hub projecting physically toward said anemometer rotor shaft with each standoff having a cross sectional dimension and situated vertically on the inside circumference of said anemometer rotor inner hub such that when the hub is rotated the standoffs will pass between the sensor plates of said photoelectric sensor resulting in an electrical output signal whose frequency is representative of the rotational velocity of said anemometer rotor structure whereby said electrical output signal is compatible to be used by digital signal processing circuitry to calculate windspeed.

6. The power supply device of claim 4(e) wherein said power supply device is comprised of a permanent magnet generator that supplies an alternating current voltage to a DC power supply affixed to said inner rotor of claim 4 that uses electronic circuit elements comprising diodes, capacitors, and voltage regulators to rectify, filter, and regulate said alternating current voltage into a stable direct current voltage to be used to power electronic circuitry with said permanent magnet generator comprising:

(a) a disklike stator subassembly mounted on static structures attached to said rigid shaft of claim 4 with said permanent magnet generator stator subassembly including a plurality of permanent magnets

(b) a disklike rotor subassembly mounted on said inner rotor of claim 4 with said permanent magnet generator rotor subassembly including a plurality of armature windings which when exposed in close proximity to and with relative motion to said permanent magnets associated with said permanent magnet generator stator subassembly will cause alternating current voltages to be induced in said armature windings which will be supplied as inputs to said DC power supply.

7. The permanent magnet generator of claim 6 wherein the actuation of said permanent magnet generator is delayed until a predetermined angular velocity of the rotating mass has been attained with the actuation of said permanent magnet generator accomplished through mechanical means comprising:

(a) a disklike rotor subassembly mounted on said inner rotor of claim 4 in such a manner so as to allow said disklike rotor subassembly to move up and down along the longitudinal axis of said inner rotor to such extent so as to allow a variable air gap between said disklike rotor subassembly and said disklike stator subassembly of claim 4 whereby until such time as the air gap between them reaches a predetermined distance no magnetic interaction of consequence will occur whereby no generation of power will occur

(b) a cylindrical structure serving as a mounting collar attached to the top of said disklike rotor subassembly with an inside diameter the same as that of said disklike rotor subassembly with a plurality of radial alignment wheels attached to said collar with the wheels'"'"' axes of rotation tangent to the inner circumference of said collar and with the radii of said radial alignment wheels such that they allow the wheels to fit into corresponding vertical channels that are formed in the substrate of said inner rotor thereby allowing the disklike rotor subassembly to maintain positive linkage with said inner rotor to limit radial movement of said disklike rotor subassembly relative to said inner rotor irregardless of vertical movement of said disklike rotor subassembly relative to said inner rotor

(c) a plurality of hollow cylindrical structures attached to and radiating from said inner rotor serving as flyweight housings with each typical flyweight housing including a dense piece of material serving as a flyweight that is placed inside said flyweight housing so that said flyweight is free to move along the longitudinal axis and within the confines of said flyweight housing with said flyweight'"'"'s travel limited in the direction toward said inner rotor by placement of a structural bulkhead within said flyweight housing and said flyweight'"'"'s travel limited in the direction away from said inner rotor by connection to said disklike rotor subassembly via cable whereby centrifugal force generated by the rotating mass causes said flyweight to move away from said inner rotor and by virtue of said connection to said disklike rotor subassembly causes said disklike rotor subassembly to move upwards along the longitudinal axis of said inner rotor to a point along the inner rotor where there exists superstructure along the outer circumference of said inner rotor that serves as a physical stop limiting further travel by disklike rotor subassembly and in turn said flyweight'"'"'s travel away from said inner rotor

(d) a plurality of pulleys corresponding to the plurality of said flyweight housings with a typical pulley including an axle, and wheel, with the axle mounted horizontally spanning the inner diameter of said flyweight housing and said wheel rotating about the axle with said pulley mounted between said structural bulkhead and said inner rotor with each typical pulley serving as a point of redirection of travel to a cable that is connected to said flyweight with said cable then passing through an opening in said structural bulkhead then riding around 90 degrees of outer circumferential surface afforded by said pulley wheel then passing through an opening in the bottom of said flyweight housing finally connecting to the top of said disklike rotor subassembly

(e) a plurality of springs mounted with their axes of extension parallel to said inner rotor with one end of said springs affixed to said inner rotor and the other end of said springs affixed to the bottom of said disklike rotor subassembly whereby said springs exert forces that oppose the movement of said disklike rotor subassembly upwards along the longitudinal axis of said inner rotor toward said disklike stator subassembly until a predetermined angular velocity is reached by said rotating mass that will produce sufficient centrifugal forces to cause said flyweights to move said disklike rotor subassembly toward said disklike stator subassembly until a predetermined physical dimension of airgap is reached to enable magnetic interaction of said disklike rotor subassembly with said disklike stator subassembly.

8. The plurality of devices of claim 4(f) wherein each said device is typically comprised of a direct current driven motor housed within the confines of said radial support structure where said radial support structure connects to said inner rotor with said direct current driven motor connected to a threaded shaft that extends along the longitudinal axis of said radial support structure with said direct current driven motor being under electrical control of said electronic circuit elements of claim 4(g) and able to rotate in either direction in order to move a captive mass threaded upon said threaded shaft to a position along said threaded shaft whereby changing the physical moment of inertia of said rotating mass to an optimum position with travel of said captive mass limited in the direction toward said inner rotor by virtue of the threaded mass completing a physical electrical circuit that includes two electrical contacts placed at a predetermined position whereby an electrical signal is propagated to said electronic circuit elements of claim 4(g) to stop driving said direct current motor upon receipt of the electrical position signal.

9. The angular velocity measuring device of claim 4 wherein said angular velocity measuring device is comprised of a permanent magnet generator whereby the alternating current voltage output of said permanent magnet generator is used as an input to electronic circuitry whereby the frequency of said alternating current voltage is representative of angular velocity.