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WO2015181841A1 - Apparatus for converting mechanical energy into electric energy - Google Patents

Apparatus for converting mechanical energy into electric energy Download PDF

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Publication number
WO2015181841A1
WO2015181841A1 PCT/IT2015/000057 IT2015000057W WO2015181841A1 WO 2015181841 A1 WO2015181841 A1 WO 2015181841A1 IT 2015000057 W IT2015000057 W IT 2015000057W WO 2015181841 A1 WO2015181841 A1 WO 2015181841A1
Authority
WO
WIPO (PCT)
Prior art keywords
electric energy
rotors
pair
rotor
hub
Prior art date
Application number
PCT/IT2015/000057
Other languages
French (fr)
Inventor
Massimo IPPOUTO
Original Assignee
Kite Gen Research S.R.L.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Kite Gen Research S.R.L. filed Critical Kite Gen Research S.R.L.
Publication of WO2015181841A1 publication Critical patent/WO2015181841A1/en

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
    • H02K7/10—Structural association with clutches, brakes, gears, pulleys or mechanical starters
    • H02K7/1004—Structural association with clutches, brakes, gears, pulleys or mechanical starters with pulleys
    • H02K7/1008—Structural association with clutches, brakes, gears, pulleys or mechanical starters with pulleys structurally associated with the machine rotor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03D—WIND MOTORS
    • F03D5/00—Other wind motors
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K16/00—Machines with more than one rotor or stator
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K5/00—Casings; Enclosures; Supports
    • H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
    • H02K5/16—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields
    • H02K5/173—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields using bearings with rolling contact, e.g. ball bearings
    • H02K5/1735—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields using bearings with rolling contact, e.g. ball bearings radially supporting the rotary shaft at only one end of the rotor
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
    • H02K7/18—Structural association of electric generators with mechanical driving motors, e.g. with turbines
    • H02K7/1807—Rotary generators
    • H02K7/1853—Rotary generators driven by intermittent forces
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
    • H02K7/18—Structural association of electric generators with mechanical driving motors, e.g. with turbines
    • H02K7/1892—Generators with parts oscillating or vibrating about an axis
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/70—Wind energy

Definitions

  • the present invention deals with an apparatus for converting mechanical energy into electric energy, in particular of the type in which the mechanical energy is transmitted by means of traction forces applied to tethers connected to a moving load through a winch.
  • winches for transmitting energy has become important in the field of managing wind energy, in which winches connected to alternators and electronic power apparatuses are used to extract the wind kinetic energy and to convert the produced mechanical energy into electric energy.
  • the pulley or the drum onto which a tether is wound rotates due to the unwinding force induced by such tether.
  • the wind kinetic energy is first of all converted into mechanical energy, due to the friction effect between tether and contact surface of the pulley or the drum, and is then converted into electric energy through alternators connected to such winch.
  • An apparatus for converting mechanical energy into electric energy comprises a drum belonging to a winch connected to a motored pulley adapted to rotate with respect to a fixed axis. At least one tether is wound by about of a revolution onto such motored pulley, transmitting a mechanical load onto the drum adapted to translate along its own rotation axis to allow winding several coils of such tether. The unwinding of the tether with respect to the pulley allows accumulating electric energy through a stator-rotor motor connected to the pulley adapted also to dampen the axial force acting on the winch.
  • the pulley behaves as an idle wheel.
  • Object of the present invention is providing an apparatus for converting mechanical energy into electric energy capable of combining different solutions for increasing the energetic efficiency.
  • a further object is providing an apparatus for converting mechanical energy into electric energy, wherein the drum belonging to the winch is subjected to a lower load due to the dampening effect induced by the motored pulley.
  • a further object is providing a motored pulley in contact with air, allowing a self-cooling action due to the absence of an external liner on the stator-rotor motor, favouring a greater energy production and a reduction of power losses due to friction phenomena, and enabling a reduced wear of the tethers.
  • FIG. 1 shows an axonometric view of an embodiment of the apparatus for converting mechanical energy into electric energy according to the present invention
  • FIG. 2 shows an axonometric view of an embodiment of a stator belonging to the apparatus of the previous Figure
  • FIG. 3 shows an axonometric view of an embodiment of a rotor generator belonging to the apparatus of Figure 1;
  • Figure 4 shows a front projection view of the apparatus of Figure 1;
  • Figure 6 shows an enlarged partially sectioned view along a portion VI of the previous Figure
  • FIG. 7 shows a front projection view of the stator of Figure 2;
  • Figure 9 shows an enlarged partially sectioned view along a portion IX of the previous Figure
  • FIG. 10 shows a front projection view of the rotor generator of Figure 3;
  • an apparatus 1 for converting mechanical energy into electric energy comprises at least one stator-type generator composed of a pair of stators 10 and at least one rotor-type generator composed of a pair of rotors 20 connected to a hub 30; such pair of stators 10 is placed inside the respective pair of rotors 20, while the stator-type generator and the rotor-type generator form an electric motor.
  • the hub 30 carries at least one pulley in contact with at least one section of tether, wherein the section of tether has an inlet section connected to a working load and an outlet section connected to a resisting load, and wherein the rotor-type generator adapted to coaxially rotate outside the stator-type generator is supported by a single sliding support 40.
  • the peculiarity of the inventive apparatus 1 are :
  • the apparatus 1 is a wind generator based on power wing profiles, or kites (not shown) , operating based on the alternate winding / unwinding of two tethers which connect each of the kites to one of the stator-type generators and of the rotor-type generators;
  • the two tethers are wound around a respective pulley of the hub 30, and the pulleys are composed of a winding drum of a winch, the pulleys being directly guided by the two electric motors of the stators 10-rotors 20 type, the rotors 20 being integrated with every pulley;
  • the sections of the electric motors are independently guided one from the other by multiple supplies (not shown) , which operate as motors or generators;
  • the single bearing 40 supports both axial and radial loads of both pulleys
  • each stator of the pair of stators 10 comprises an internal carrier cylinder 11 fastened to an internal ring 41.
  • Each rotor of the pair of rotors 20 comprises an external carrier cylinder 21 fastened to an external ring 42 through the hub 30.
  • the internal ring 41 and the external ring 42 belong to the single sliding rotary support 40.
  • the hub 30 is composed of a pair of flanges 31.
  • Each of the flanges 31 comprises a coaxial annular groove 32 adapted to house and block a magnetic ring (not shown) .
  • the internal carrier cylinder 11 comprises a bracket (not shown) projecting from a radial hole 12.
  • the bracket allows supporting and blocking an encoder (not shown) adapted to interact with the magnetic ring.
  • the single sliding support 40 is a ball bearing with four points with slanted contact.
  • the apparatus for converting mechanical energy into electric energy 1 does not comprise any type of external covering.
  • the apparatus for converting mechanical energy into electric energy 1 is made with a symmetrical shape with respect to the sliding support 40

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)

Abstract

A kite powered wind generator comprising two independently controlled outer rotor-type electric motor generators axially aligned on a single central support, each rotor carrying a winch pulley in contact with a section of a tether holding the kite; both rotors and pulleys are coaxially connected to a single hub (30), said hub (30) is supported and journaled by a single central bearing (40) between the two rotors.

Description

APPARATUS FOR CONVERTING MECHANICAL ENERGY INTO ELECTRIC ENERGY
The present invention deals with an apparatus for converting mechanical energy into electric energy, in particular of the type in which the mechanical energy is transmitted by means of traction forces applied to tethers connected to a moving load through a winch.
Recently, the application of winches for transmitting energy has become important in the field of managing wind energy, in which winches connected to alternators and electronic power apparatuses are used to extract the wind kinetic energy and to convert the produced mechanical energy into electric energy.
The pulley or the drum onto which a tether is wound rotates due to the unwinding force induced by such tether. During this process, the wind kinetic energy is first of all converted into mechanical energy, due to the friction effect between tether and contact surface of the pulley or the drum, and is then converted into electric energy through alternators connected to such winch.
An apparatus for converting mechanical energy into electric energy comprises a drum belonging to a winch connected to a motored pulley adapted to rotate with respect to a fixed axis. At least one tether is wound by about of a revolution onto such motored pulley, transmitting a mechanical load onto the drum adapted to translate along its own rotation axis to allow winding several coils of such tether. The unwinding of the tether with respect to the pulley allows accumulating electric energy through a stator-rotor motor connected to the pulley adapted also to dampen the axial force acting on the winch.
In this way, the reciprocating axial motion of the drum of the winch adapted to wind several coils of tether is made easier due to a reduced load of the tether by interposing the motored pulley.
In the winding step of the tether on such drum, the pulley behaves as an idle wheel.
The prior art of an apparatus for converting mechanical energy into electric energy is given by patents whose object is increasing the energy efficiency. According to patent US5898988, a direct current motor without brushes for automotive and HVAC applications uses a single bearing in slanted contact to connect an external rotor to an internal stator.
Documents EP-A2-1220426, WO-A1-2012/005597 , US-A1-2009/284104, EP-A1-1475340 , EP-A1-1178007 and US-A-5898988 disclose conversion apparatuses according to the preamble of Claim 1.
Object of the present invention is providing an apparatus for converting mechanical energy into electric energy capable of combining different solutions for increasing the energetic efficiency.
A further object is providing an apparatus for converting mechanical energy into electric energy, wherein the drum belonging to the winch is subjected to a lower load due to the dampening effect induced by the motored pulley.
A further object is providing a motored pulley in contact with air, allowing a self-cooling action due to the absence of an external liner on the stator-rotor motor, favouring a greater energy production and a reduction of power losses due to friction phenomena, and enabling a reduced wear of the tethers. The above and other objects and advantages of the invention, which will result from the following description, are obtained with an apparatus for converting mechanical energy into electric energy as claimed in claim 1. Preferred embodiments and non-trivial variations of the present invention are the subject matter of the dependent claims.
It is intended that all enclosed claims are an integral part of the present description.
It will be immediately obvious that numerous variations and modifications (for example related to shape, sizes, arrangements and parts with equivalent functionality) could be made to what is described, without departing from the scope of the invention as appears from the enclosed claims.
The present invention will be better described by some preferred embodiments thereof, provided as a non-limiting example, with reference to the enclosed drawings, in which:
- Figure 1 shows an axonometric view of an embodiment of the apparatus for converting mechanical energy into electric energy according to the present invention;
- Figure 2 shows an axonometric view of an embodiment of a stator belonging to the apparatus of the previous Figure;
- Figure 3 shows an axonometric view of an embodiment of a rotor generator belonging to the apparatus of Figure 1;
- Figure 4 shows a front projection view of the apparatus of Figure 1;
- Figure 5 shows a sectional view along line V-V of the previous Figure;
Figure 6 shows an enlarged partially sectioned view along a portion VI of the previous Figure;
- Figure 7 shows a front projection view of the stator of Figure 2;
- Figure 8 shows a sectional view along line VIII-VIII of the previous Figure;
Figure 9 shows an enlarged partially sectioned view along a portion IX of the previous Figure;
- Figure 10 shows a front projection view of the rotor generator of Figure 3;
- Figure 11 shows a sectional view along line XI-XI of the previous Figure; and
Figure 12 shows an enlarged partially sectioned view along a portion XII of the previous Figure . With reference to Figures 1 to 6, an apparatus 1 for converting mechanical energy into electric energy according to the invention comprises at least one stator-type generator composed of a pair of stators 10 and at least one rotor-type generator composed of a pair of rotors 20 connected to a hub 30; such pair of stators 10 is placed inside the respective pair of rotors 20, while the stator-type generator and the rotor-type generator form an electric motor.
The hub 30 carries at least one pulley in contact with at least one section of tether, wherein the section of tether has an inlet section connected to a working load and an outlet section connected to a resisting load, and wherein the rotor-type generator adapted to coaxially rotate outside the stator-type generator is supported by a single sliding support 40.
The peculiarity of the inventive apparatus 1 are :
- the apparatus 1 is a wind generator based on power wing profiles, or kites (not shown) , operating based on the alternate winding / unwinding of two tethers which connect each of the kites to one of the stator-type generators and of the rotor-type generators;
the two tethers are wound around a respective pulley of the hub 30, and the pulleys are composed of a winding drum of a winch, the pulleys being directly guided by the two electric motors of the stators 10-rotors 20 type, the rotors 20 being integrated with every pulley;
the sections of the electric motors are independently guided one from the other by multiple supplies (not shown) , which operate as motors or generators;
- the single bearing 40 supports both axial and radial loads of both pulleys;
- hubs 30, rotors 20 and stators 10 are assembled projecting on the central flange; so that the electric energy being generated arrives with bursts during the unwinding step of the tether separated by identical bursts of use of electric energy during the winding step of the tethers .
With reference to Figures 5, 6, 7, 8, 9, each stator of the pair of stators 10 comprises an internal carrier cylinder 11 fastened to an internal ring 41. Each rotor of the pair of rotors 20 comprises an external carrier cylinder 21 fastened to an external ring 42 through the hub 30.
The internal ring 41 and the external ring 42 belong to the single sliding rotary support 40.
With reference to Figures 5, 6, 10, 11, 12, the hub 30 is composed of a pair of flanges 31.
Each of the flanges 31 comprises a coaxial annular groove 32 adapted to house and block a magnetic ring (not shown) .
The internal carrier cylinder 11 comprises a bracket (not shown) projecting from a radial hole 12.
The bracket allows supporting and blocking an encoder (not shown) adapted to interact with the magnetic ring.
According to a preferred embodiment, the single sliding support 40 is a ball bearing with four points with slanted contact.
The apparatus for converting mechanical energy into electric energy 1 does not comprise any type of external covering.
According to a preferred embodiment, the apparatus for converting mechanical energy into electric energy 1 is made with a symmetrical shape with respect to the sliding support 40

Claims

Apparatus (1) for converting mechanical energy into electric energy, comprising at least one stator-type generator composed of a pair of stators (10) and at least one rotor-type generator composed of a pair of rotors (20) connected to a hub (30) , said pair of stators (10) being placed inside said respective pair of rotors (20) , said stator-type generator and said rotor-type generator forming an electric motor, said hub (30) carrying at least one pulley in contact with at least one section of tether, said section of tether having an inlet section connected to a working load and an outlet section connected to a resisting load, characterized in that:
said apparatus (1) is a wind generator based on power wing profiles, or kites, operating based on the alternate winding / unwinding of two tethers which connect each of said kites to one of said stator-type generators and rotor-type generators;
said two tethers are wound around a respective pulley of the hub (30), said pulleys being composed of a winding drum of a winch, said pulleys being directly guided by the two electric motors of the stators (10) -rotors (20) type, the rotors (20) being integrated in every pulley;
- the sections of the electric motors are independently guided one from the other by multiple supplies, which operate as motors or generators;
- the single bearing (40) supports both axial and radial loads of both pulleys;
- hubs (30), rotors (20) and stators (10) are assembled projecting on the central flange; said rotor-type generator adapted to coaxially rotate outside said stator-type generator is supported by a single sliding support (40); so that the electric energy being generated arrives with bursts during the unwinding step of the tether separated by identical bursts of use of electric energy during the winding step of the tethers.
Apparatus (1) for converting mechanical energy into electric energy according to the previous claim, characterized in that each stator of said pair of stators (10) comprises an internal carrier cylinder (11) fastened to an internal ring (41) and each rotor of said pair of rotors
(20) comprises an external carrier cylinder (21) fastened to an external ring (42) through said hub (30), said internal ring (41) and said external ring (42) both belonging to said single sliding rotary support (40) .
Apparatus (1) for converting mechanical energy into electric energy according to the previous claim, characterized in that said hub (30) is composed of a pair of flanges (31) , each one of said flanges (31) equipped with a coaxial annular groove (32) adapted to house and block a magnetic ring, said internal carrier cylinder (11) equipped with a bracket projecting from a radial hole (12), said bracket adapted to support and block an encoder adapted to interact with said magnetic ring.
Apparatus (1) for converting mechanical energy into electric energy according to any one of the previous claims, characterized in that said single sliding support (40) is a ball bearing with four points with slanted contact.
Apparatus (1) for converting mechanical energy into electric energy according to any one of the previous claims, characterized in that the apparatus does not comprise any type of external covering .
PCT/IT2015/000057 2014-05-28 2015-03-05 Apparatus for converting mechanical energy into electric energy WO2015181841A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITTO20140424 2014-05-28
ITTO2014A000424 2014-05-28

Publications (1)

Publication Number Publication Date
WO2015181841A1 true WO2015181841A1 (en) 2015-12-03

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Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5898988A (en) 1995-12-14 1999-05-04 Siemens Electric Ltd. Method of making a brushless motor with inside mounted single bearing
EP1178007A1 (en) 2000-08-02 2002-02-06 Schlumberger Technology B.V. Winch with 2 coaxial drums for well logging applications
EP1220426A2 (en) 2000-12-27 2002-07-03 Mitsubishi Denki Kabushiki Kaisha A rotary electromechanical device and a pulley driving system using the rotary electromechanical device
EP1475340A1 (en) 2003-03-11 2004-11-10 Rieter CZ a.s. Device for individual driving of rotary means for transport or winding a textile material in an operating unit of a textile machine
WO2007122650A1 (en) * 2006-04-24 2007-11-01 Kite Gen Research S.R.L. Aeolian system comprising power wing profiles and process for producing electric energy
US20090284104A1 (en) 2006-03-31 2009-11-19 Siemens Aktiengesellschaft Built-in motor, in particular a built-in torque motor
WO2009147692A2 (en) * 2008-06-04 2009-12-10 Massimo Ippolito Infrastructure for driving and assisted take-off of airfoils for tropospheric aeolian generator
CN201918837U (en) * 2011-01-07 2011-08-03 成都精密电机厂 Single-support assembled torque motor structure without end cover
WO2011121557A2 (en) * 2010-03-31 2011-10-06 Kitenergy S.R.L. Actuating systems for controlling the flight of a power wing profile for conversion of wind energy into electrical or mechanical energy
WO2012005597A1 (en) 2010-07-09 2012-01-12 Smartmotor As Electrical machine for submerged application and energy conversion system
WO2013147600A2 (en) * 2012-03-27 2013-10-03 E-Kite Holding B.V. Kite power system

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5898988A (en) 1995-12-14 1999-05-04 Siemens Electric Ltd. Method of making a brushless motor with inside mounted single bearing
EP1178007A1 (en) 2000-08-02 2002-02-06 Schlumberger Technology B.V. Winch with 2 coaxial drums for well logging applications
EP1220426A2 (en) 2000-12-27 2002-07-03 Mitsubishi Denki Kabushiki Kaisha A rotary electromechanical device and a pulley driving system using the rotary electromechanical device
EP1475340A1 (en) 2003-03-11 2004-11-10 Rieter CZ a.s. Device for individual driving of rotary means for transport or winding a textile material in an operating unit of a textile machine
US20090284104A1 (en) 2006-03-31 2009-11-19 Siemens Aktiengesellschaft Built-in motor, in particular a built-in torque motor
WO2007122650A1 (en) * 2006-04-24 2007-11-01 Kite Gen Research S.R.L. Aeolian system comprising power wing profiles and process for producing electric energy
WO2009147692A2 (en) * 2008-06-04 2009-12-10 Massimo Ippolito Infrastructure for driving and assisted take-off of airfoils for tropospheric aeolian generator
WO2011121557A2 (en) * 2010-03-31 2011-10-06 Kitenergy S.R.L. Actuating systems for controlling the flight of a power wing profile for conversion of wind energy into electrical or mechanical energy
WO2012005597A1 (en) 2010-07-09 2012-01-12 Smartmotor As Electrical machine for submerged application and energy conversion system
CN201918837U (en) * 2011-01-07 2011-08-03 成都精密电机厂 Single-support assembled torque motor structure without end cover
WO2013147600A2 (en) * 2012-03-27 2013-10-03 E-Kite Holding B.V. Kite power system

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