(19)
(11)EP 3 257 143 B1

(12)EUROPEAN PATENT SPECIFICATION

(45)Mention of the grant of the patent:
29.04.2020 Bulletin 2020/18

(21)Application number: 16703136.8

(22)Date of filing:  05.02.2016
(51)International Patent Classification (IPC): 
B61F 15/00(2006.01)
H02K 7/18(2006.01)
H02K 21/44(2006.01)
B61D 43/00(2006.01)
(86)International application number:
PCT/EP2016/052513
(87)International publication number:
WO 2016/128321 (18.08.2016 Gazette  2016/33)

(54)

POWER GENERATOR ASSEMBLY FOR ROTATING APPLICATIONS

STROMGENERATORBAUGRUPPE FÜR ROTIERENDE ANWENDUNGEN

ENSEMBLE GÉNÉRATEUR DE PUISSANCE POUR APPLICATIONS ROTATIVES


(84)Designated Contracting States:
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

(30)Priority: 09.02.2015 GB 201502097

(43)Date of publication of application:
20.12.2017 Bulletin 2017/51

(73)Proprietor: Aktiebolaget SKF
415 50 Göteborg (SE)

(72)Inventors:
  • ANGELIS, Georgo
    5342 NJ Oss (NL)
  • KUIJPERS, Toon
    5211 HB Den Bosch (NL)
  • MCGOOGAN, Gerard
    Taynuilt Scotland GA35 1AG (GB)
  • VAN DER HAM, Andreas Clemens
    3521 BE Utrecht (NL)

(74)Representative: Kohl, Thomas et al
SKF GmbH Gunnar-Wester-Strasse 12
97421 Schweinfurt
97421 Schweinfurt (DE)


(56)References cited: : 
EP-A1- 2 323 242
WO-A1-89/07362
EP-A2- 1 033 296
DE-A1- 19 756 904
  
      
    Note: Within nine months from the publication of the mention of the grant of the European patent, any person may give notice to the European Patent Office of opposition to the European patent granted. Notice of opposition shall be filed in a written reasoned statement. It shall not be deemed to have been filed until the opposition fee has been paid. (Art. 99(1) European Patent Convention).


    Description

    Background of the Invention



    [0001] Power generator assemblies including a rotating part and a non-rotating part are widely known. A stator as a non-rotating part is then usually configured such that it encompasses the rotor as a rotating part completely.

    [0002] One type of generator assembly is a so-called variable reluctance generator wherein a magnetic circuit powered by a permanent magnet and passing through a coil is periodically opened and closed. The AC voltage induced in the coil as a result of the oscillating magnetic field may be used to generate energy or to drive other devices.

    [0003] An example of a variable reluctance generator for powering direct ignition in an internal combustion engine is disclosed in WO 89/07362.

    [0004] In some applications, the room for a stator encompassing the rotor may be limited and be available only on one side. For example in train bogies with saddle type suspension, it may be possible to arrange additional structures on or in a saddle adapter, whereas structures arranged below the axle may be excluded for security reasons and extreme environmental conditions.

    [0005] An example of a variable reluctance generator assembly for an axle of a train bogie is disclosed in DE 19756904. The assembly comprises a rotor mounted to an end of the axle and a stator mounted to the bogie. The stator comprises a permanent magnet, stator windings and first and second spaced apart magnetically permeable elements having pole ends adjacent the outer peripheral surface of the rotor. The outer peripheral surface of the rotor comprises a series of spaced apart reluctance poles separated by a dielectric material.

    Summary of the Invention



    [0006] The invention seeks to provide a versatile generator assembly suitable for use in situations where an amount or a quality of available space in different radial directions of a rotating part is inhomogeneous.

    [0007] The invention relates to a power generator assembly according to claim 1, which includes a rotating part and a non-rotating part, in particular to a power generator assembly for use in a train axlebox, wherein the rotating part is configured to be mounted on an end cap.

    [0008] It is proposed that the rotating part includes at least one generator unit. The generator unit is preferably of modular type and includes at least one coil, at least one permanent magnet and two pole shoes having pole surfaces facing radially outward. The non-rotating part includes an arc-shaped saddle adaptor of ferromagnetic material arranged with a radial gap to the pole surfaces. The saddle adaptor is configured to close a magnetic circuit passing via the pole shoes through the coil in at least one first rotational position where the saddle adaptor overlaps with the pole shoes of the generator unit, wherein the magnetic circuit is at least partially opened if the saddle adaptor does not overlap or does not overlap completely with both of the pole shoes.

    [0009] The configuration described above works based on a variable reluctance generator principle in that the oscillating magnetic field of the magnetic circuit being periodically opened and closed induces an oscillating voltage in the coil of each generator unit. This oscillating voltage can be used for driving electronic devices arranged on the rotating part as desired without external power supply.

    [0010] In the context of the invention, the expression arc-shaped means that the saddle adaptor does not extend over the entire circumference but only over a certain fraction thereof, wherein that fraction differs from both 0° and 360° by at least the angular length of a generator unit, i.e. the distance between the middle points or the outer edges of the pole surfaces.

    [0011] According to the invention, the circumferential lengths of a generator unit and of the saddle adaptor are such that at least one second rotational position exists where the saddle adaptor does not overlap with the pole shoes of a generator unit. In this configuration, the magnetic circuit should be at least partly open and the magnetic flux will be significantly lower. The magnetic flux therefore changes from minimum to maximum when the rotating part rotates from the second rotational position to the first rotational position and vice versa.

    [0012] In a preferred embodiment, the power generator assembly has at least first and second generator units. Additional units can be added to increase the output power if required. Preferably, the generator units are substantially identical to each other and are arranged adjacent to each other in circumferential direction.

    [0013] There is consequently a risk of magnetic flux leakage between the generator units, which might adversely affect the magnitude of the difference between the maximum and minimum magnetic flux through a generator coil as the rotating part rotates from the second rotational position to the first rotational position and vice versa.

    [0014] According to a further development, this problem is alleviated in that the direction of magnetization of adjacent generator units is oppositely oriented. In other words, adjacent pole shoes of adjacent generator units have the same magnetic polarity.

    [0015] In a further development, leakage of magnetic flux is further reduced in that an additional permanent magnet is arranged between the adjacent pole shoes of at least the first and second generator units. Suitably, the direction of magnetization of the additional permanent magnet is such that the magnetic flux is oriented in the same direction as that of the adjacent pole shoes. The additional permanent magnet will be referred to as a guide magnet and has the effect of repelling stray magnetic flux, so as to guide the flux to the saddle adapter.

    [0016] In a still further development, the power generating assembly comprises at least one shunt magnet which has the effect of increasing the net flux difference between maximum and minimum when a generator unit rotates between the first and second rotational positions. The at least one shunt magnet is arranged in proximity to at least one of the generator units and is configured to produce a magnetic field that is oppositely oriented from the magnetic field produced by the at least one generator unit. When the at least one generator unit is not underneath the saddle adaptor, i.e. in the "open" first rotational position, the shunt magnet reduces the net magnetic flux of the at least one generator unit. The magnetic flux may even become negative. When the generator unit is underneath the saddle adaptor, i.e. in the "closed", second rotational position, the shunt magnet also reduces the net magnetic flux. However, the reduction in flux is relatively less when the unit is in the closed position, meaning that a greater difference between the maximum and minimum flux is achieved. This improves the power output of the generator unit.

    [0017] The rotating part is configured to be mounted on an end cap configured to hold a bearing of a train axle and the saddle adaptor is configured to be mounted on a train bogie side frame.

    [0018] If necessary, the rotating part comprises at least one counterweight unit configured to compensate for imbalances created by the arrangement of at least two adjacent generator units.

    [0019] The counterweight unit may itself comprise a generator unit having at least one coil, at least one permanent magnet and two pole shoes having pole surfaces facing radially outward. For example, the rotating part of the power generating assembly may comprise a first generator device, having one or more circumferentially adjacent generator units, and comprise a second generator device, having one or more circumferentially adjacent generator units, whereby the second generator device is arranged at an angular interval from the first generator device, which interval is selected to rotationally balance the rotating part.

    [0020] As will be understood, the mass of and location of further components of the rotating part are taken into account when determining the angular position of the counterweight unit.

    [0021] According to a still further development, it is proposed that the saddle adaptor includes a main body part and at least one additional piece configured to increase the surface area of the saddle adaptor and/or decrease the air gap provided between the saddle adaptor and the pole shoes. In the case of a train axlebox, the main body may be integrated in the saddle or saddle adapter of a saddle type train bogie suspension.

    [0022] In one example, the at least one additional piece comprises a toothed radially inner surface, such that a varying radial gap is provided between the saddle adaptor and the pole shoes. This has the advantage of increasing flux change. In a further example, the radially inner surface of the saddle adapter is directly provided with such a toothed profile.

    [0023] The invention further proposes that the rotating part includes power harvesting electronics configured to accumulate AC power generated by the oscillating magnetic field passing through the coils.

    [0024] Further, it is proposed that the rotating part includes at least one condition monitoring sensor and a wireless transmitter configured to be driven by power generated by the at least one generator unit. The condition monitoring sensor may be a temperature sensor, a vibration sensor or other type of sensor for monitoring an operating parameter of interest.

    [0025] The invention further proposes that the rotating part comprises means for monitoring an output signal from at least one generator unit. Suitably, the generated voltage signal is monitored. The signal is necessarily cyclical in nature and may thus be used to determine rotational speed of the rotating part and, in the case of a train axle, the linear distance travelled.

    [0026] Signal amplitude may also be monitored. The amplitude varies depending on the radial gap between the pole shoes and the radially inner surface of the saddle adaptor and on a degree of axial overlap between the pole shoes and said surface.

    [0027] In the case of a train axle comprising a first and a second power generator assembly according to the invention at first and second ends of the axle respectively, the monitored voltage signal from the first and second assemblies may advantageously be compared with each other. If, for example, both signals exhibit a similar change in voltage, this may be used to detect a sideways movement of a train bogie that comprises the axle.

    [0028] A yet further aspect of the invention relates to a train bogie including a power generator assembly according to the invention.

    [0029] The above embodiments of the invention as well as the appended claims and figures show multiple characterizing features of the invention in specific combinations. The skilled person will easily be able to consider further combinations or sub-combinations of these features in order to adapt the invention as defined in the claims to his specific needs.

    Brief Description of the Figures



    [0030] 
    Fig. 1
    is a schematic view of an end part of a train axle equipped with a power generator assembly according to the invention;
    Figs. 2a and 2b
    are schematic illustrations of the principle of operation of the power generator assembly; and
    Fig. 3a
    is a schematic illustration of a power generator assembly comprising two adjacent generator units with magnetic fields oriented in the same direction;
    Fig. 3b
    is a schematic illustration of a preferred embodiment of the invention comprising adjacent generator units with oppositely oriented magnetic fields.
    Fig. 3c
    is a schematic illustration of a further embodiment of an assembly according to the invention.
    Figs. 4a and 4b
    are schematic illustrations of a generator unit of a still further embodiment of the invention, shown in first and second rotational positions respectively.

    Detailed Description of the Embodiments



    [0031] Fig. 1 is a schematic view of an end part of a train axle, wherein outer rings 10a, 10b of a double row tapered roller bearing configured to mount the axle 12 in the saddle type adapter 26 of a train bogie are visible.

    [0032] An end cap 14 is fastened to an end face of the axle 12 by means of three bolts and preloads a split inner ring of the bearing in an axial direction. A rotating part 16a of a power generator assembly according to the invention is provided on an outer rim of the end cap 14. The outer rim of the end cap 14 is substantially divided in two halves. One section 16c houses the electronics and the other half includes multiple generator units 18a - 18d. Four generator units 18a - 18d are provided in the embodiment illustrated.

    [0033] The power generator assembly includes the rotating part 16a and a non-rotating part 16b. The generator units 18a - 18d are of modular type and essentially identical in configuration. Each of the generator units 18a - 18d includes one coil 20 arranged between two permanent magnets 22a, 22b and first and second pole shoes having pole surfaces 24a, 24b facing radially outward each. In the embodiment illustrated, the first and second pole shoes are formed by first and second permanent magnets 22a, 22b which are arranged such that a first pole surface 24a has a first polarity and a second pole surface 24b has an opposite polarity. The pole shoes may also be formed by opposite poles of a single magnet.

    [0034] The non-rotating part 16b includes an arc-shaped saddle adaptor 26 of ferromagnetic material, in particular iron, arranged with a radial gap to the pole surfaces 24a, 24b.

    [0035] The saddle adaptor is configured to close a magnetic circuit passing via the pole shoes 22a, 22b through the coil in a rotational position where the saddle adaptor 26 overlaps with the pole shoes 22a, 22b of one of the generator units 18a - 18d, wherein the magnetic circuit is at least partially opened if the saddle adaptor 26 does not overlap or does not overlap completely with both of the pole shoes 22a, 22b.

    [0036] When the axle is rotating, the saddle adaptor 26 periodically passes the generator unit 18a such that the magnetic flux will be periodically varying. The oscillating magnetic field of the magnetic circuit being periodically opened and closed induces an oscillating voltage in the coil of the generator unit. This oscillating voltage can be then used for driving electronic devices arranged in the electronics section 16c of the assembly as desired without external power supply.

    [0037] The circumferential lengths of the first generator unit 18a and of the saddle adaptor 26 are such that at least one rotational position exists where the saddle adaptor 26 does not overlap with the pole shoes 22a, 22b of the first generator unit. Specifically, the circumferential length of the saddle adaptor 26 is a multiple of the circumferential length and the pitch of the generator units 18a - 18d such that these are closed in a first rotational position and open in a second rotational position.

    [0038] The principle of operation is illustrated in Figs. 2a and 2b, wherein the saddle adaptor 26 and a first generator unit 18a are illustrated without curvature for the sake of simplicity. Fig. 2a illustrates the case where the saddle adaptor 26 does not overlap with the pole shoes 22a, 22b of the generator unit. Mainly, magnetic flux passes from the North pole to the South pole of each permanent magnet 22a, 22b, as shown by the dashed magnetic field lines at the second pole shoe 22b. There may also be a weak magnetic flux passing between the two magnets 22a, 22b and through the coil, as illustrated by the dashed line extending between the pole surfaces 24a, 24b of the generator unit 18a.

    [0039] In the presence of a ferromagnetic material, i.e. when the saddle adaptor 26 overlaps with the pole shoes 22a, 22b of the generator unit 18a, the majority of magnetic flux is guided through the saddle adapter 26, as illustrated by the dashed lines in Fig. 2b, and a magnetic circuit is formed that causes a strong magnetic flux to pass through the coil. The arrows 34 in Fig. 2b show the direction of the principle magnetic circuit that is generated. The associated magnetic field will be referred to as the generator field.

    [0040] When two or more generators are arranged next to each other, there is a risk of flux leakage between adjacent units. Consider the situation depicted in Fig. 3a, in which a first generator unit 18a and a second generator unit 18b' are schematically shown. Again, the pole shoes of the generator units are formed by permanent magnets. The second pole shoe 22b of the first generator unit 18a and the adjacent first pole shoe 22a' of the second generator unit have opposite magnetic polarity. The dashed magnetic field lines indicate the magnetic flux that is generated between the two units 18a and 18b'. This flux represents leakage and will be generated when the units are in an "open" first rotational position and in a "closed" second rotational position. Consequently, the flux through the coil 20 of each generator unit will be less and the change in flux will be less, leading to lower power generation.

    [0041] In a preferred embodiment of the invention, wherein the power generating assembly comprises at least first and second generator units, flux leakage between adjacent units is reduced, as illustrated in Fig. 3b. Here, the second pole shoe 22b of the first generator unit 18a and the adjacent first pole shoe 22a of the second generator unit 18b have the same magnetic polarity. Consequently, the creation of a magnetic circuit between adjacent units is avoided. Some magnetic flux is still generated between the North and South poles of each permanent magnet, which represents a flux leakage within each generator unit 18a, 18b.

    [0042] In a further development of the invention, the power generating assembly comprises a guide magnet arranged between adjacent pole shoes 22b, 22a of at least one set of adjacent generating units 18a, 18b. The effect of the guide magnet 28 is shown in Figure 3c, where the first and second units 18a, 18b are shown in a situation where both are underneath the saddle adapter 26. The guide magnet 28 is magnetized in the same direction as the adjacent pole shoes of the first and second generator units. As a result, "stray" magnetic flux is guided through the saddle adaptor and through the coil 20 of each unit, to enhance the desired magnetic circuit and generator field of each generator. Preferably, a guide magnet 28 is arranged between each set of adjacent generator units, as shown in Figure 1.

    [0043] In a still further development of the invention, at least one generator unit comprises a shunt magnet, which has the effect of enhancing the power efficiency of the unit. This will be explained with reference to Figures 2a, 2b, 4a and 4b.

    [0044] The power output of the generator unit 18a is dependent of the magnitude of the change in magnetic flux when the unit rotates between the first and second rotational positions. In the first rotational position, as depicted in Fig. 2a, a weak flux Φ1 passes between the pole shoes 22a, 22b and through the coil 20. A much stronger flux Φ2 passes between the pole shoes 22a, 22b and through the coil 20 in the second rotational position, as depicted in Fig. 2b. This gives rise to a first change in flux Δ Φ1, whereby Δ Φ1 = Φ2 - Φ1.

    [0045] In the embodiment depicted in Figures 4a and 4b, the generator unit comprises first and second shunt magnets 30a, 30b arranged radially inward of the first and second pole shoes 22a, 22b respectively and radially outward of the end cap 14. Apart from the shunt magnets, the unit of Figures 4a and 4b is identical to that of Figures 2a and 2b. The shunt magnets 30a, 30b and the end cap 14, which is made of a ferromagnetic material, produce a magnetic circuit, whereby the associated flux passing though the coil will be referred to as the shunt flux, and is represented by arrows 32 in Fig. 4a. The flux passing between the pole shoes 22a, 22b and through the coil 20, illustrated by the arrows 33, will be referred to as the generator flux. The shunt flux is oppositely oriented from the generator flux and, in the open first position, shown in Fig. 4a, is stronger than the generator flux. The net flux Φ3 is therefore relatively weaker and may even be negative compared to the flux Φ1 of the configuration shown in Fig. 2a.

    [0046] In the closed position shown in Fig. 4b, the generator flux indicated by arrows 34 is significantly stronger than in the open position. The oppositely oriented shunt flux interacts with the generator flux such that a net flux Φ4 passes through the coil 20. The net flux Φ4 is smaller than the initial flux Φ2 generated in the Fig. 2b configuration; however, the reduction is relatively less compared with the reduction in the open position. This is particularly the case when the initial flux Φ2 would result in saturation. Consequently, the resulting change in flux ΔΦ2, given by Φ4 - Φ3, is larger than the change in flux ΔΦ1 for the configuration without shunt magnets, leading to improved power output.

    [0047] Further embodiments of the invention include cases where the rotating part comprises at least one counterweight unit configured to compensate for imbalances created by the arrangement of generator units 18a - 18d. In addition, the saddle adaptor 26 may include a main body part and at least one additional piece configured to increase the surface area of the saddle adaptor 26 and/or decrease the air gap provided between the saddle adaptor 26 and the pole shoes 22a, 22b.

    [0048] The electronics section 16c of the rotating part 16a includes power harvesting electronics configured to accumulate AC power generated by the oscillating magnetic field passing through the coils and at least one condition monitoring sensor such as a temperature sensor, an acoustic emission sensor or a vibration sensor for measuring operating parameters of the bearing and/or of the axle. Further, the electronics section includes a wireless transmitter configured to be driven by power generated by the generator units 18a - 18d.


    Claims

    1. Power generator assembly including a rotating part (16a) and a non-rotating part (16b), wherein the rotating part (16a) is mounted on an end cap (14) configured to hold a bearing of a train axle (12),
    characterized in that
    the rotating part (16a) includes at least one generator unit (18a- 18d) including at least one coil (20), at least one permanent magnet (22a, 22b) and two pole shoes having pole surfaces (24a, 24b) of opposite polarities facing radially outward, wherein the non-rotating part (16b) includes an arc-shaped saddle adaptor (26) in which the axle (12) is mounted via the bearing, the arc-shaped saddle adaptor (26) being made of ferromagnetic material and arranged with a radial distance to the pole surfaces (24a, 24b), wherein the saddle adaptor (26) is configured to close a magnetic circuit passing via the pole shoes, the at least one permanent magnet (22a, 22b) and through the coil in a rotational position where the saddle adaptor (26) overlaps with the pole shoes of the generator unit (18a - 18d), wherein the circumferential lengths of the at least one generator unit (18a - 18d) and of the saddle adaptor (26) are such that at least one rotational position exists where the saddle adaptor (26) does not overlap with the pole shoes of the generator unit (18a - 18d).
     
    2. Power generator assembly according to one of the preceding claims,
    characterized by
    comprising multiple generator units (18a - 18d) each having at least one coil (20), at least one permanent magnet (22a, 22b) and two pole shoes.
     
    3. Power generator assembly according to one of the preceding claims,
    characterized in that
    the rotating part (16a) comprises at least one counterweight unit configured to compensate for imbalances created by the at least one generator unit.
     
    4. Power generator assembly according to one of the preceding claims,
    characterized in that
    the saddle adaptor (26) includes a main body part and at least one additional piece configured to increase the surface area of the saddle adaptor (26) and/or decrease the air gap provided between the saddle adaptor (26) and the pole shoes.
     
    5. Power generator assembly according to one of the preceding claims,
    characterized in that
    a radially inner surface of the saddle adaptor (26), which faces the pole shoes, has a toothed profile such that varying radial gap exists between the pole surfaces (24a, 24b) and saddle adapter.
     
    6. Power generator assembly according to one of the preceding claims,
    characterized in that
    the rotating part (16a) includes power harvesting electronics configured to accumulate AC power generated by the oscillating magnetic field passing through the coils (20).
     
    7. Power generator assembly according to one of the preceding claims,
    characterized in that
    the rotating part (16a) includes at least one condition monitoring sensor and a wireless transmitter configured to be driven by power generated by the at least one generator unit.
     
    8. Power generator assembly according to one of the preceding claims,
    characterized in that
    the rotating part (16a) includes means for monitoring an output signal from the at least one generator unit (18a - 18d).
     
    9. Power generator assembly according to claim 8, further comprising means for processing the monitored signal in order to determine at least the rotational speed of the rotating part (16a).
     
    10. Railway bogie side frame including a power generator assembly according to one of the preceding claims.
     
    11. Railway bogie side frame according to claim 10, comprising an axle (12) with a first end and a second end which are respectively provided with a first and a second power generator assembly according to claim 9, further comprising means for comparing a first output signal from the first assembly with a second output signal from the second assembly, for detecting a sideways movement of the bogie side frame.
     


    Ansprüche

    1. Leistungsgeneratoranordnung, die einen Drehteil (16a) und einen Nichtdrehteil (16b) enthält, wobei der Drehteil (16a), auf einer Stirnkappe (14) montiert ist, die konfiguriert ist, ein Lager einer Zugachse (12) zu halten,
    dadurch gekennzeichnet, dass
    der Drehteil (16a) mindestens eine Generatoreinheit (18a-18d) enthält, die mindestens eine Spule (20), mindestens einen Permanentmagneten (22a, 22b) und zwei Polschuhe, die Polflächen (24a, 24b) entgegengesetzter Polaritäten besitzen, die radial nach außen weisen, enthält, wobei der Nichtdrehteil (16b) einen bogenförmigen Satteladapter (26) enthält, in dem die Achse (12) mittels des Lagers montiert ist, wobei der bogenförmige Satteladapter (26) aus einem ferromagnetischen Material hergestellt ist und mit einer radialen Distanz zu den Polflächen (24a, 24b) angeordnet ist, wobei der Satteladapter (26) konfiguriert ist, einen Magnetkreis, der über die Polschuhe, den mindestens einen Permanentmagneten (22a, 22b) und durch die Spule verläuft, in einer Drehposition, in der der Satteladapter (26) mit den Polschuhen der Generatoreinheit (18a-18d) überlappt, zu schließen,
    wobei die Umfangslängen der mindestens einen Generatoreinheit (18a-18d) und des Satteladapters (26) derart ausgelegt sind, dass mindestens eine Drehposition vorliegt, bei der der Satteladapter (26) nicht mit den Polschuhen der Generatoreinheit (18a-18d) überlappt.
     
    2. Leistungsgeneratoranordnung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass
    sie mehrere Generatoreinheiten (18a-18d) umfasst, die jeweils mindestens eine Spule (20), mindestens einen Permanentmagneten (22a, 22b) und zwei Polschuhe besitzen.
     
    3. Leistungsgeneratoranordnung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass
    der Drehteil (16a) mindestens eine Gegengewichtseinheit umfasst, die konfiguriert ist, Ungleichgewichte, die durch die mindestens eine Generatoreinheit erzeugt werden, zu kompensieren.
     
    4. Leistungsgeneratoranordnung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass
    der Satteladapter (26) einen Hauptkörperteil und mindestens ein zusätzliches Stück, das konfiguriert ist, den Oberflächenbereich des Satteladapters (26) zu erhöhen und/oder den Luftspalt, der zwischen dem Satteladapter (26) und den Polschuhen vorgesehen ist, zu verringern, enthält.
     
    5. Leistungsgeneratoranordnung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass
    eine radiale Innenfläche des Satteladapters (26), die den Polschuhen zugewandt ist, ein Zahnprofil besitzt, derart, dass ein variierender radialer Spalt zwischen den Polflächen (24a, 24b) und dem Satteladapter vorliegt.
     
    6. Leistungsgeneratoranordnung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass
    der Drehteil (16a) eine Leistungs-Harvesting-Elektronik enthält, die konfiguriert ist, Wechselstromleistung, die durch das oszillierende Magnetfeld, das durch die Spulen (20) verläuft, erzeugt wird, zu akkumulieren.
     
    7. Leistungsgeneratoranordnung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass
    der Drehteil (16a) mindestens einen Zustandsüberwachungssensor und einen drahtlosen Sender enthält, die dafür konfiguriert sind, durch die von der mindestens einen Generatoreinheit erzeugte Leistung angetrieben zu werden.
     
    8. Leistungsgeneratoranordnung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass
    der Drehteil (16a) ein Mittel zum Überwachen eines Ausgangssignals der mindestens einen Generatoreinheit (18a-18d) enthält.
     
    9. Leistungsgeneratoranordnung nach Anspruch 8, die ferner ein Mittel zum Verarbeiten des überwachten Signals umfasst, um mindestens die Drehzahl des Drehteils (16a) zu bestimmen.
     
    10. Eisenbahndrehgestellseitenrahmen, der eine Leistungsgeneratoranordnung nach einem der vorhergehenden Ansprüche enthält.
     
    11. Eisenbahndrehgestellseitenrahmen nach Anspruch 10, der eine Achse (12) mit einem ersten Ende und einem zweiten Ende, die mit einer ersten bzw. einer zweiten Leistungsgeneratoranordnung nach Anspruch 9 versehen sind, umfasst und ferner ein Mittel umfasst, um ein erstes Ausgangssignal der ersten Anordnung mit einem zweiten Ausgangssignal der zweiten Anordnung zu vergleichen, um eine seitliche Bewegung des Drehgestellseitenrahmens zu detektieren.
     


    Revendications

    1. Ensemble générateur d'énergie comportant une pièce rotative (16a) et une pièce non rotative (16b), la pièce rotative (16a) étant montée sur un embout (14) configuré pour maintenir un palier d'un essieu de train (12),
    caractérisé en ce que
    la pièce rotative (16a) comporte au moins une unité génératrice (18a - 18d) comportant au moins une bobine (20), au moins un aimant permanent (22a, 22b) et deux épanouissements polaires présentant des surfaces polaires (24a, 24b) de polarités opposées tournées radialement vers l'extérieur, la pièce non rotative (16b) comportant un adaptateur selle de cheval en arc de cercle (26) dans lequel l'essieu (12) est monté par le biais du palier, l'adaptateur selle de cheval en arc de cercle (26) étant constitué d'un matériau ferromagnétique et agencé avec une distance radiale par rapport aux surfaces polaires (24a, 24b), l'adaptateur selle de cheval (26) étant configuré pour fermer un circuit magnétique passant par les épanouissements polaires, l'au moins un aimant permanent (22a, 22b) et à travers la bobine dans une position de rotation dans laquelle l'adaptateur selle de cheval (26) chevauche les épanouissements polaires de l'unité génératrice (18a - 18d),
    les longueurs circonférentielles de l'au moins une unité génératrice (18a - 18d) et de l'adaptateur selle de cheval (26) étant telles qu'il existe au moins une position de rotation dans laquelle l'adaptateur selle de cheval (26) ne chevauche par les épanouissements polaires de l'unité génératrice (18a - 18d).
     
    2. Ensemble générateur d'énergie selon l'une des revendications précédentes,
    caractérisé par le fait qu'il
    comprend plusieurs unités génératrices (18a - 18d), chacune comportant au moins une bobine (20), au moins un aimant permanent (22a, 22b) et deux épanouissements polaires.
     
    3. Ensemble générateur d'énergie selon l'une des revendications précédentes,
    caractérisé en ce que
    la pièce rotative (16a) comprend au moins une unité contrepoids configurée pour compenser des déséquilibres créés par l'au moins une unité génératrice.
     
    4. Ensemble générateur d'énergie selon l'une des revendications précédentes,
    caractérisé en ce que
    l'adaptateur selle de cheval (26) comporte une pièce formant corps principal et au moins un élément additionnel configuré pour accroître l'aire de surface de l'adaptateur selle de cheval (26) et/ou réduire l'entrefer ménagé entre l'adaptateur selle de cheval (26) et les épanouissements polaires.
     
    5. Ensemble générateur d'énergie selon l'une des revendications précédentes,
    caractérisé en ce que
    une surface radialement intérieure de l'adaptateur selle de cheval (26), tournée vers les épanouissements polaires, présente un profil denté de façon à ménager un intervalle radial variable entre les surfaces polaires (24a, 24b) et l'adaptateur selle de cheval.
     
    6. Ensemble générateur d'énergie selon l'une des revendications précédentes,
    caractérisé en ce que
    la pièce rotative (16a) comporte de l'électronique de récupération d'énergie configurée pour accumuler de l'énergie en courant alternatif générée par le passage du champ magnétique oscillant au travers des bobines (20).
     
    7. Ensemble générateur d'énergie selon l'une quelconque des revendications précédentes,
    caractérisé en ce que
    la pièce rotative (16a) comporte au moins un capteur de surveillance d'état et un émetteur sans fil configuré pour être entraîné par la puissance générée par l'au moins une unité génératrice.
     
    8. Ensemble générateur d'énergie selon l'une des revendications précédentes,
    caractérisé en ce que
    la pièce rotative (16a) comporte des moyens de surveillance d'un signal de sortie issu de l'au moins une unité génératrice (18a - 18d).
     
    9. Ensemble générateur d'énergie selon la revendication 8, comprenant en outre des moyens de traitement du signal surveillé dans le but de déterminer au moins la vitesse de rotation de la pièce rotative (16a) .
     
    10. Longeron de bogie ferroviaire comportant un ensemble générateur d'énergie selon l'une des revendications précédentes.
     
    11. Longeron de bogie ferroviaire selon la revendication 10, comprenant un essieu (12) dont une première extrémité et une deuxième extrémité sont respectivement pourvues d'un premier et d'un deuxième ensemble générateur d'énergie selon la revendication 9, comprenant en outre des moyens de comparaison d'un premier signal de sortie issu du premier ensemble à un deuxième signal de sortie issu du deuxième ensemble pour la détection d'un mouvement latéral du longeron de bogie.
     




    Drawing

















    Cited references

    REFERENCES CITED IN THE DESCRIPTION



    This list of references cited by the applicant is for the reader's convenience only. It does not form part of the European patent document. Even though great care has been taken in compiling the references, errors or omissions cannot be excluded and the EPO disclaims all liability in this regard.

    Patent documents cited in the description