Rotator with non-continuous shaft, rotor arrangement, rotor with multiple magnetic masses and corresponding electrically rotating machine

Description

[0001] The present invention relates to rotating electrical machines and more particularly to an electrical machine rotor comprising a non-through shaft.

[0002] The present invention also relates to an assembly of several rotors, a rotor with multiple magnetic masses and a rotating electrical machine comprising such an assembly of rotors or such a rotor.

[0003] There figure 1 illustrates an example of an industrial installation according to the prior art comprising a rotating electrical machine 1 comprising a rotor 2 with a through shaft or a monobloc rotor comprising a shaft and a magnetic body made of the same material, connected on the one hand to a gas turbine 3 by a coupling device 4 and, on the other hand, to a compressor 5 by a coupling device 6.

[0004] For example, the gas turbine produces and transmits to the rotor 2 a mechanical power of 130 MW and the electric machine 1 generates an electrically generated power of 45 MW.

[0005] Compressor 5 receives via rotor 2 a total power of 175 MW resulting from the sum of mechanical and electrical power.

[0006] Therefore, the coupling device 6 is sized to transmit a power of at least 175 MW.

[0007] Depending on the operating modes of the industrial installation, the torque transmitted via coupling devices 4 and 6 is, for example, greater than one million Nm (Newton-meters) at a low rotational speed of less than 200 revolutions per minute, or the transmitted torque is, for example, less than 200,000 Nm at a high rotational speed of more than 3,000 revolutions per minute.

[0008] Document EP0609645 describes a laminated rotor comprising a non-through shaft for an asynchronous electric motor.

[0009] The ends of the rotor are cylindrical and each is equipped with a coupling device.

[0010] Document US2014097721 relates to a similar rotor.

[0011] The US9450470B2 document describes a rotor comprising two magnetic masses without an opening connected by a half-shaft, each magnetic mass comprising at one free end a cylindrical non-through half-shaft.

[0012] Documents EP3048701 and EP3048703 disclose a rotor with a non-through shaft comprising two half-shafts.

[0013] The end of one of the half-shafts comprises a one-piece coupling sleeve and the free end of the other half-shaft is cylindrical, supporting the mass of the rotor via a bearing located at that same end.

[0014] The cylindrical half-shaft has no coupling function.

[0015] The coupling joint is fixed to another coupling joint in one piece, arranged for example at the end of the compressor shaft 5 to transmit the required torque.

[0016] It is therefore also necessary to add a coupling device to the end of the second shaft to transmit torque to that end.

[0017] Generally, an added coupling coupling is mounted on the cylindrical end of the half-shaft, for example a coupling sleeve including a coupling coupling.

[0018] The coupling flange is mounted on the shaft, for example by shrink fitting, by keying or by hydraulic shrink fitting of the coupling flange onto a conical end of the shaft.

[0019] Coupling the rotor first requires making the coupling sleeve including a coupling sleeve and then mounting the assembly onto the shaft.

[0020] The production of the cake and its mounting on the shaft require specific machining phases for both the cake and the shaft.

[0021] These operations require costly fine manufacturing tolerances on the added coupling flange and on the end of the shaft receiving the coupling flange.

[0022] In addition, the shaft must be lengthened to accommodate a shrink-fit interface including the cover.

[0023] As it is an added part, the torque transferred by the added coupling joint is limited to prevent it from separating from the shaft and rotating on itself.

[0024] To increase the value of the torque transmitted by the added coupling coupling, the coupling coupling has splines cooperating with splines located at the end of the shaft.

[0025] However, the production of the splined shaft and associated coupling flange entails additional complex, time-consuming and costly machining operations.

[0026] We know from document US9190879 of a rotor comprising two half-shafts compacting magnetic sheets through which a central shaft connected to the half-shafts passes, the shaft holding the magnetic sheets compacted.

[0027] The free end of each half-shaft comprises a one-piece coupling coupling.

[0028] However, as magnetic sheets include a central recess, and at high peripheral rotational speeds, for example 300 m / s, mechanical stresses are concentrated around the recess and are likely to damage the magnetic sheets.

[0029] We also know from the prior art a single-piece rotor comprising two shaft ends, a magnetic mass and coupling sleeves connected to the shaft ends made of the same material.

[0030] However, such a rotor cannot be disassembled, as the magnetic mass and the shaft are solid and one-piece.

[0031] Consequently, large rotors are difficult to transport.

[0032] Furthermore, if a component of the rotor, for example an end of the shaft breaks, it is not possible to repair the rotor.

[0033] It is therefore proposed to overcome the disadvantages of rotors including a non-through shaft according to the state of the art, in particular by increasing the value of the torque transmissible through the rotor while limiting the number of elements of the rotor to limit the complexity of manufacturing the rotor, the size of the rotor and by facilitating its dismantling.

[0034] In view of the foregoing, the invention proposes a non-through shaft rotor for an electric machine according to claim 1.

[0035] Each half-shaft is made from a single piece and includes a coupling flange located opposite the mounting flange.

[0036] According to one characteristic, the mounting flange and the coupling sleeve of a half-shaft are connected by a median shaft.

[0037] Advantageously, the median trees have different lengths.

[0038] Preferably, the outside diameter of at least one coupling flange is less than or equal to the outside diameter of the magnetic mass.

[0039] Preferably, the half-trees are identical.

[0040] According to the invention, the coupling flange includes through holes distributed over at least one diameter to accommodate fastening means so as to transmit a torque.

[0041] According to another characteristic, the through holes are distributed in a staggered pattern over at least two different diameters of the cake.

[0042] The through holes are alternately smooth and threaded.

[0043] Advantageously, the magnetic mass comprises compacted magnetic sheets.

[0044] Preferably, the magnetic mass comprises a stack of metal plates.

[0045] According to another feature, the non-through shaft rotor further includes tie rods distributed evenly over at least one diameter of the magnetic mass so as to keep the magnetic mass compacted between the half-shafts, the diameter of at least one center shaft being greater than the diameter of the tie rod insertion, the outside diameter of the mounting flange of said half-shaft being equal to the diameter of the center shaft, one end of each tie rod being engaged in a tapped hole in the center shaft comprising as many tapped holes as tie rods.

[0046] Preferably, the magnetic mass comprises a single-piece metallic body.

[0047] Advantageously, the magnetic mass includes a central recess.

[0048] Preferably, the magnetic mass comprises conductive bars and two short-circuit rings so as to form a squirrel cage, the short-circuit rings not being compacted between the fixing flanges and the magnetic mass.

[0049] According to another aspect, a series rotor assembly is proposed comprising at least two non-through shaft rotors as defined previously, in which a coupling sleeve of one rotor is fixed to a coupling sleeve of the other rotor to transmit torque between the two rotors.

[0050] Preferably, the rotor coupling sleeves are fixed together via an intermediate shaft comprising two coupling sleeves.

[0051] Advantageously, the intermediate shaft is supported by a bearing.

[0052] According to yet another aspect, a multi-magnetic mass rotor is proposed, comprising a non-through shaft rotor as defined previously, and at least one cylindrical magnetic mass, one end of which is connected to the mounting flange of a third half-shaft in one piece and the second end is connected to a rotor coupling sleeve to transmit torque between the magnetic masses.

[0053] According to yet another aspect, a rotating electrical machine is proposed comprising a non-through shaft rotor, an assembly of rotors in series or a rotor with multiple magnetic masses as defined previously.

[0054] Other features and advantages of the invention will become apparent from the following description of embodiments of the invention, given solely by way of non-limiting examples and with reference to the drawings in which: there figure 1 , which has already been mentioned, illustrates an industrial installation comprising a rotating electrical machine according to the prior art; the figure 2 illustrates a first method of implementing an industrial installation; the figure 3 illustrates a first embodiment of a rotor with a non-through shaft; the figure 4 illustrates a second embodiment of a rotor with a non-through shaft; the figures 5 et 6 illustrate a third embodiment of the coupling nut; the figure 7 illustrates a fourth embodiment of the coupling nut; the figure 8 illustrates a third embodiment of the rotor with a non-through shaft; the figure 9 illustrates a fourth embodiment of the non-through shaft rotor; the figure 10 illustrates a fifth embodiment of the non-through shaft rotor; the figure 11 illustrates a sixth embodiment of the non-through shaft rotor; the figure 12 illustrates a seventh embodiment of the non-through shaft rotor; the figure 13 illustrates a first method of assembling rotors in series; the figure 14 illustrates a second embodiment of a series assembly of rotors; and the figure 15 illustrates an example of an embodiment of a rotor with multiple magnetic masses.

[0055] We refer to the figure 2 which illustrates a first embodiment of an industrial installation 10 comprising a rotating electrical machine 11 of which a first end of the rotor 15 is connected to a first mechanical system 12 and a second end of the rotor is connected to a second mechanical system 13.

[0056] The rotating electrical machine 11 further comprises a stator 14 in which is inserted a rotor 15 comprising a non-through shaft of a central axis (A).

[0057] The rotating electrical machine 11 can be a wound-rotor asynchronous machine, a squirrel-cage asynchronous machine or a synchronous machine whose rotor is preferably supplied via rings and brushes.

[0058] The first and second mechanical systems 12 and 13 each comprise a shaft 12a and 13a each comprising a coupling sleeve 12b and 13b.

[0059] The coupling sleeves 12b and 13b are connected to respective ends of the rotor 15 to transmit mechanical torque between the rotor 15 and the mechanical systems 12 and 13.

[0060] The first mechanical system 12 is, for example, a gas turbine and the second mechanical system 13 is, for example, a compressor consuming the torque supplied by the gas turbine.

[0061] If the rotating electrical machine 11 operates in motor mode, the second mechanical system 13 receives on its shaft 13a a torque equal to the sum of the torques generated by the machine 11 and the first mechanical system 12, the rotor 15 being sized to transmit the torques generated by the machine and the gas turbine, for example a torque of up to one million Nm

[0062] If the rotating electrical machine 11 operates in generator mode, the torque generated by the first mechanical system 12 is transmitted to the second mechanical system 13 via the rotor 15.

[0063] We will refer to the figure 3 which illustrates an axial cross-sectional view of a first embodiment of the rotor 15 with non-through shaft for a squirrel cage asynchronous rotating electrical machine.

[0064] The rotor 15 with non-through shaft comprises a cylindrical magnetic mass 16 enclosed by two half-shafts 17 and 18.

[0065] The magnetic mass 16 has an outer diameter d16.

[0066] The half-shafts 17 and 18 each comprise a mounting flange 17a and 18a connected to one end of the magnetic mass 16, and a coupling sleeve 17b and 18b located opposite the mounting flange 17a and 18a and connected to the corresponding mechanical system 12 or 13.

[0067] Each half-shaft 17 and 18 is made in one piece. The coupling flange 17b and 18b is not attached to the half-shaft 17 and 18.

[0068] Therefore, each coupling flange can transmit by continuity of material a higher value torque than in the case of a half-shaft comprising a coupling flange added and secured to the half-shaft for example by shrink fitting or keying.

[0069] The half-shafts 17 and 18 are obtained for example by forging or casting and are for example made of steel.

[0070] Each half-shaft 17 and 18 further comprises a median shaft 17c and 18c between the mounting flange 17a or 18a and the coupling flange 17b or 18b.

[0071] Each median shaft 17c and 18c can be supported in rotation by a bearing (not shown) or without a bearing if each shaft 12a and 13a is supported by a bearing.

[0072] The coupling swages 17b and 18b are cylindrical and comprise an outside diameter d17 and d18 respectively.

[0073] The outside diameter d17 and d18 of at least one coupling sleeve 17 and 18 is less than or equal to the outside diameter d16 of the magnetic mass 16 so that the rotor 15 can be inserted into the stator 14 of the electrical machine 11 without dismantling the stator or without inserting the rotor 15 into a stator comprising several assembled and detachable parts.

[0074] Half-trees 17 and 18 are identical.

[0075] Therefore, the rotor 15 is symmetrical with respect to a plane (P1) perpendicular to the axis of rotation (A) and passing through a plane of symmetry of the magnetic mass 16.

[0076] The eigenmodes of rotor 15 are not duplicated, rotor 15 having fewer eigenmodes than in the case of different half-shafts, thus increasing the range of usable rotational speeds without damaging rotor 15.

[0077] Furthermore, the rotating electrical machine 11 can be angularly displaced by an angle of 180°, for example, to optimize the routing of cables connecting the stator to a power supply device. Since the rotor 15 is symmetrical, the two couplings 17b and 18b are in the same position, allowing coupling to the mechanical systems 12 and 13 when the machine 11 has been angularly displaced by 180°.

[0078] Furthermore, the magnetic mass 16 comprises two short-circuit discs 19 enclosing compacted magnetic sheets 20 and conductive bars 21 housed in the magnetic sheets 20 and the short-circuit discs 19 so that the short-circuit discs 19 and the conductive bars 21 form a squirrel cage.

[0079] Tie rods 22 are evenly distributed over a diameter of the magnetic mass 16 so as to keep the magnetic sheets 20 compacted between the half-shafts 17 and 18.

[0080] The tie rods 22 pass through smooth holes arranged in the half-shafts 17 and 18, and include at each end a nut so as to keep the magnetic sheets 20 compacted.

[0081] According to a second embodiment of the rotor 15 shown in the figure 4 The diameter d17c of the median shaft 17c is chosen so that it is greater than the mounting diameter of the tie rods 22 so that one end of each tie rod 22 is engaged in a thread of the median shaft 17c, the median shaft 17c comprising as many threads distributed over a diameter of the median shaft as there are tie rods 22. The outside diameter d17a of the mounting flange 17a is equal to the diameter d17c of the median shaft 17c.

[0082] Alternatively, the magnetic mass 16 comprises compacted metal plates replacing the compacted magnetic sheets.

[0083] The thickness of the magnetic sheets 20 is preferably less than 2 mm, preferably 0.65 mm, for example 0.5 mm.

[0084] The thickness of the metal plates is preferably greater than 5% of the outside diameter d16 of the magnetic mass 16.

[0085] According to another variant, the metal plates are connected to each other by screws embedded in the plates, and the metal plates at the ends are connected to the half-shafts 17 and 18 by screws embedded in the end plates.

[0086] Each coupling flange 17b and 18b includes through holes 23 and 24 distributed over a diameter to accommodate fastening means to transmit torque.

[0087] Preferably, the through holes 23 and 24 are evenly distributed over the diameter and / or each coupling flange 17b and 18b comprises an even number of through holes 23 and 24.

[0088] Each coupling 17b and 18b preferably includes between 6 and 48 through holes.

[0089] The centers of the through holes 23, 24 are evenly distributed over the same diameter d23a, d24a less than or equal to 0.9 times the outside diameter d17, d18 of the coupling flange 17, 18.

[0090] The through holes 23 and 24 preferably have a diameter d23 and d24 less than or equal to 0.1 times the outside diameter d17 and d18 of the corresponding coupling flange 17 and 18.

[0091] The coupling swages 17 and 18 preferably have a thickness e17 and e18 less than or equal to 0.2 times the outside diameter d17 and d18 of the corresponding coupling swage 17 and 18.

[0092] The fastening means include bolts or threaded rods having at each end a nut so that the coupling flanges of the half-shafts 17 and 18 are secured to the coupling flanges of the mechanical torque transmission systems 12 and 13.

[0093] According to a second embodiment, the through holes 23 and 24 comprise tapped holes, while the through holes in the mechanical system housings are smooth. Screws passing through the smooth holes cooperate with the tapped holes to transmit torque between the rotor 15 and the mechanical systems 12 and 13.

[0094] According to a third embodiment of the through holes 23 shown in figures 5 et 6 , the coupling flange 17b includes through holes 23 alternately smooth 25 and tapped 26, and the coupling flange 13b of the second mechanical system 13 includes through holes alternately smooth 27 and tapped 28 arranged so that a smooth hole 25 of the flange 17b is coaxial with a tapped hole 28 of the flange 13b, and a tapped hole 26 of the flange 17b is coaxial with a smooth hole 27 of the flange 13b.

[0095] Screws 29 each pass through a smooth hole 27, 25 of a 13b, 17b coupling and each screw is engaged in a tapped hole 26, 28 of a 17b, 13b coupling.

[0096] Of course, the coupling coupling 18b can include through holes 24 according to the third embodiment cooperating with the coupling coupling 12b of the first mechanical system 12.

[0097] There figure 5 illustrates a partial view of the half-shaft 17 including the coupling flange 17b and the central shaft 17c, the shaft 13a including the coupling flange 13b and the screws 29, and the figure 6 illustrates a partial section along an axial direction of the figure 5 .

[0098] The heads of the screws 29 are arranged alternately on the side of the median shaft 17c and the shaft 13a allowing to reduce the angular distance separating two adjacent through holes so as to increase the number of screws 29 to increase the maximum torque transmitted through the coupling sleeves 13b and 17b.

[0099] According to other embodiments, the two coupling sleeves may have through holes of different types or of the same type, the two coupling sleeves 17b and 18b being designed to cooperate with the coupling sleeves 13b and 12b of the mechanical systems 13 and 12, or vice versa if the rotor 15 is symmetrical and angularly displaced by an angle of 180°.

[0100] For example, coupling coupling 17b may have smooth holes and coupling coupling 18b may have tapped holes or smooth and tapped holes, as described previously.

[0101] According to a fourth embodiment of the coupling coupling 17b, 18b illustrated in the figure 7 , the centers of the through holes 23, 24 of the coupling flange 17b, 18b are distributed uniformly in a staggered pattern over two different diameters D1 and D2 of the coupling flange 17b, 18b, the diameter D2 being greater than the diameter D1, the through holes 23, 24 being arranged preferably in even numbers on each of the diameters D1 and D2.

[0102] Preferably, the diameter D2 is less than or equal to 0.9 times the outside diameter d17, d18 of the coupling flange 17b, 18b, and the diameter D1 of the second row of through holes 23, 24 is preferably less than or equal to 0.8 times the outside diameter d17, d18 of the coupling flange 17b, 18b.

[0103] The diameter of each through hole d23, d24 is preferably less than or equal to 0.1 times the outside diameter d17, d18 of the coupling flange 17b, 18b.

[0104] Of course, the through holes 23, 24 can be distributed over at least three different diameters of the coupling flange 17b, 18b, to transmit more torque.

[0105] The embodiments of the through holes of the coupling spars 17b and 18b described above can of course be combined.

[0106] There figure 8 illustrates a view of a third embodiment of the rotor 15 with a non-through shaft.

[0107] We find the magnetic mass 16 enclosed by the half-trees 17 and 18.

[0108] This embodiment differs from the first embodiment of the rotor 15 in that the outside diameter d18 of the coupling flange 18b is less than the outside diameter d17 of the coupling flange 17b, the outside diameter d17 of the coupling flange 17b being greater than the outside diameter d16 of the magnetic mass 16.

[0109] The outer diameter d18 of the coupling sleeve 18b is less than the outer diameter d16 of the magnetic mass 16 so as to insert the rotor 15 into the stator 14 without dismantling the stator.

[0110] There figure 9 illustrates a view of a fourth embodiment of the rotor 15 with a non-through shaft.

[0111] We find the magnetic mass 16 enclosed by the half-trees 17 and 18.

[0112] This embodiment differs from the first embodiment of the rotor 15 in that the median shafts 17c and 18c connecting respectively the fixing flanges 17a and 18a and the coupling sleeves 17b and 18b are of different lengths L17 and L18.

[0113] Of course, the second and third embodiments of rotor 15 can be combined.

[0114] There figure 10 illustrates a partial section along an axial direction of a fifth embodiment of the rotor 15.

[0115] This embodiment differs from the first embodiment illustrated in the figure 3 in that the magnetic mass 16 comprises a one-piece metallic body 30 and the fixing flanges 17a and 18a further comprise counterbores 31.

[0116] The rotor 15 also includes screws 32 distributed evenly over a diameter of each half-shaft 17 and 18.

[0117] Each screw 32 is engaged in a threaded hole 33 in the one-piece metal body 30 so as to keep the short-circuit discs 19 and the metal body 30 compacted between the half-shafts 17 and 18.

[0118] Each screw head 32a is housed in a counterbore 31 of the half-shaft 17 and 18.

[0119] In the variant not shown, the fixing flanges 17a and 18a do not include a counterbore.

[0120] The one-piece metal body 30 further includes housings 34 accommodating the conductive bars 21 distributed uniformly over a diameter of the one-piece metal body 30 forming with the short-circuit discs 19 a squirrel cage.

[0121] According to a sixth embodiment of the rotor 15 illustrated in the figure 11 illustrating a section along an axial direction of the rotor 15, the magnetic sheets 20 and the short-circuit discs 19 include a central recess so that the magnetic mass 16 includes a central recess 34.

[0122] This embodiment of the magnetic mass 16 is permitted when the peripheral speed of the rotor 15 is less than 180 m / s so that the concentration of mechanical stresses generated during the rotation of the rotor 15 on the periphery of the central recess 34 of each of the magnetic sheets 20 is not likely to damage the magnetic mass 16.

[0123] The central recess 34 of the magnetic mass 16 makes it possible to lighten the mass of the rotor in order to increase the critical speed of the rotor 15.

[0124] The central recess does not have a through shaft or central tie rod to ensure the compaction of the magnetic mass 16.

[0125] Short-circuit discs 19 are preferably made of copper or copper alloy.

[0126] Short-circuit discs 19 generally have a lower elastic limit than magnetic sheets 20.

[0127] To prevent the short-circuit discs 19 from exceeding their elastic limit, in an alternative not shown, the short-circuit discs 19 do not include a central recess.

[0128] A seventh embodiment of the rotor 15 is illustrated in the figure 12 and differs from the sixth embodiment illustrated in the figure 11 in that the magnetic mass 16 does not include a short-circuit disk 19.

[0129] The rotor 15 has short-circuit rings 19a which are not compacted between the fixing flanges 17a and 18a and the magnetic mass 16.

[0130] The short-circuit rings referenced 19a and the conductive bars 21 form a squirrel cage.

[0131] In the variant not shown, the magnetic mass 16 does not include a central recess.

[0132] Although the embodiments of the non-through-shaft rotor 15 described above are squirrel-cage asynchronous rotors, the invention also applies to a wound asynchronous non-through-shaft rotor. In this case, the conductive bars are replaced by slots housing interconnected coils.

[0133] The invention also applies to a wound synchronous non-through-shaft rotor preferably powered by a slip ring and brush device. The conductive bars can then be replaced by slots housing coils connected, for example, to the slip rings.

[0134] We refer to the figure 13 which illustrates a first embodiment of a series rotor assembly 35 comprising two rotors 36 and 37 comprising a non-through shaft similar to rotor 15.

[0135] The first and second rotors 36 and 37 each comprise a magnetic mass 38 and 39 sandwiched between two half-shafts 40, 41 and 42, 43, each half-shaft being a single piece and similar to the half-shafts described previously.

[0136] The magnetic masses 38 and 39 are identical, for example of the monobloc type and of the same dimensions.

[0137] The first half-shaft 40 of the first rotor 36 includes a mounting flange 40a connected to the magnetic mass 38 and a coupling sleeve 40b connected by a median shaft 40c to the mounting flange, the outside diameter d40 of the coupling sleeve 40b being greater than the outside diameter d38 and d39 of the magnetic masses 38 and 39 of the first and second rotors 36 and 37.

[0138] The second half-shaft 41 of the first rotor 36 includes a mounting flange 41a connected to the magnetic mass 38 and a coupling sleeve 41b connected by a median shaft 41c to the mounting flange, the outside diameter d41 of the coupling sleeve 41b being less than the outside diameter d38 and d39 of the magnetic masses 38 and 39 of the first and second rotors 36 and 37.

[0139] The first half-shaft 42 of the first rotor 37 includes a mounting flange 42a connected to the magnetic mass 39 and a coupling sleeve 42b connected by a median shaft 42c to the mounting flange, the outside diameter d42 of the coupling sleeve 42b being less than the outside diameter d38 and d39 of the magnetic masses 38 and 39 of the first and second rotors 36 and 37.

[0140] The coupling flanges 41b and 42b of the second half-shaft 41 of the first rotor 36 and of the first half-shaft 42 of the second rotor 37 are dimensioned to be joined, for example by bolts passing through the coaxial through holes 44 and 45 of the coupling flanges 41b and 42b to transmit a torque between the two rotors 36 and 37.

[0141] The second half-shaft 43 of the first rotor 37 includes a mounting flange 43a connected to the magnetic mass 39 and a coupling sleeve 43b connected by a median shaft 43c to the mounting flange, the outside diameter d43 of the coupling sleeve 43b being less than the outside diameter d38 and d39 of the magnetic masses 38 and 39 of the first and second rotors 36 and 37.

[0142] The outside diameters of the coupling sleeves d40, d41, d42, and d43 are chosen so that the series rotor assembly 35 can be inserted into a stator 14 comprising two sub-stators each cooperating with a rotor 36 and 37 without dismantling the stator 14 and so that each rotor 36 and 37 generates an electromagnetic torque.

[0143] For example, the referenced diameters d41, d42 and d43 are smaller than the referenced diameters d38 and d39, and the referenced diameter d40 is larger than the referenced diameters d38 and d39.

[0144] In the variant not shown, the reference diameters d40, d41 and d42 are smaller than the reference diameters d38 and d39, and the reference diameter d43 is larger than the reference diameters d38 and d39. The insertion direction of the series rotor assembly 35 in the stator is reversed compared to the previous example.

[0145] According to yet another variant not shown, the referenced diameters d40, d41, d42 and d43 are smaller than the referenced diameters d38 and d39 allowing the insertion of the series rotor assembly 35 into the stator in both directions.

[0146] According to other embodiments, the magnetic masses 36 and 37 can be of different dimensions and / or types, including for example magnetic sheets 20 or a stack of metal plates.

[0147] According to a second embodiment, the series rotor assembly 35 may further comprise an intermediate shaft 46 disposed between the coupling flanges 41b and 42b of the second half-shaft 41 of the first rotor 36 and the first half-shaft 42 of the second rotor 37 so as to transmit torque between the two rotors 36 and 37 as illustrated in the figure 14 .

[0148] The intermediate shaft 46 includes at each of its ends a coupling sleeve 47 and 48 cooperating with the coupling sleeves 41b and 42b of the rotors 36 and 37.

[0149] The coupling flanges 47 and 48 of the intermediate shaft 46 each include through holes 47a and 48a cooperating with the through holes 44 and 45 of the coupling flanges 41b and 42b to accommodate, for example, bolts.

[0150] The intermediate shaft 46 allows the rotors 36 and 37 to be moved away from each other in order to create a space which simplifies the maintenance of the rotating electrical machine 11.

[0151] Depending on the geometry and / or material of the intermediate shaft 46, it is possible to adjust the critical speed of the series rotor assembly 35 so as to modify the frequency of the natural modes in torsion and bending of the assembly 35.

[0152] Furthermore, since the critical speed can be modified by adjusting the geometric characteristics or the material of the intermediate shaft 46, it is sufficient to produce two identical rotors 36 and 37 and connect them with an intermediate shaft dimensioned to adjust the critical speed of the assembly 35 to the desired critical speed.

[0153] It is also easy to modify the critical speed of the assembly 35 during the life of the machine 11 by modifying the characteristics of the intermediate shaft 46.

[0154] The intermediate shaft can be supported in rotation by a bearing 49.

[0155] The support of the intermediate shaft 46 by the bearing 49 makes it possible to increase the critical bending speed of the assembly 35 of rotors in series.

[0156] The assembly 35 of rotors in series may include more than two rotors in series, some adjacent rotors being connected by an intermediate shaft supported or not by a bearing, the stator comprising as many sub-stators as rotors and each cooperating with a rotor so as to generate an electromagnetic torque.

[0157] We refer to the figure 15 which illustrates an example of an embodiment of a rotor with multiple magnetic masses 50.

[0158] The multi-mass magnetic rotor 50 comprises a rotor 37 as previously described and a second cylindrical magnetic mass 51 whose ends are connected on one side to the coupling flange 42b of the first half-shaft 42 of the rotor 37 and, on the other side, to the fixing flange 52a of a third half-shaft 52 similar to the half-shafts 42 and 43.

[0159] Magnetic masses 39 and 51 are identical, but they may be of different types and / or different dimensions.

[0160] The outer diameter of the magnetic masses 39 and 51, and the outer diameter of the half-shafts 42, 43 and 52 are dimensioned so that the rotor 50 can be inserted into the stator 14 which includes as many sub-stators as magnetic masses in order to generate an electromagnetic torque.

[0161] In an alternative not shown, the multi-mass magnetic rotor 50 includes a support bearing to support the rotating median shaft 42c.

[0162] The support bearing allows the critical bending speed of the multi-mass magnetic rotor to be increased by 50.

[0163] For example, the multi-mass magnetic rotor may include more than two magnetic masses, the magnetic masses being separated by half-shafts supported or not by bearings.

[0164] The rotating electrical machine comprising the series assembly of rotors or the rotor with multiple magnetic masses makes it possible to develop a greater electrical power than that of a machine comprising a single rotor while respecting the maximum dimensioning values ​​of rotating electrical machines, for example by not exceeding a peripheral speed of the rotor of 300 m / s and by controlling the dimensional characteristics of the rotating electrical machine so that it is for example transportable and easily dismantled for easier maintenance.

[0165] Of course, the rotating electrical machine comprising the rotor 15, the series assembly of rotors 35 or the multi-mass magnetic rotor 50 can operate in motor or generator mode.

[0166] According to other embodiments not shown, the outside diameter of the coupling flanges of an element comprising the rotor 15, the series assembly of rotors 35, or the multi-mass rotor 50 is greater than the diameter of their magnetic mass. In these embodiments, the stator housing one of these elements comprises several parts assembled around the element so that the element is disposed in the stator without being disassembled, the stator and the element forming a rotating electrical machine.

[0167] The rotor 15, the series assembly of rotors 35 and the multi-mass magnetic rotor 50 allow the transfer of torque up to one million Nm

Claims

1. A non-through shaft rotor (15, 36, 37) for an electric machine, connected to a coupling flange (13b) of a mechanical system (13), the rotor comprising a cylindrical magnetic mass (16, 38, 39) sandwiched between two half shafts (17, 18, 40, 41, 42, 43) each comprising a fastening clamp (17a, 18a, 40a, 41a, 42a, 43a) connected to the magnetic mass, each half shaft is made as a single piece and comprises a coupling flange (17b, 18b, 40b, 41b, 42b, 43b) located opposite to the fastening clamp, the coupling flange (17b, 18b, 40b, 41b, 42b, 43b) of each half shaft comprising through-holes (23, 24, 44, 45) distributed over at least one diameter to accommodate fastening means so as to transmit a torque, characterised in that the through-holes of the flange (17b) of at least one half shaft (17) are alternately smooth (25) and tapped (26), and the coupling flange (13b) of the mechanical system (13) includes alternately smooth and threaded through-holes (28) arranged such that a smooth hole (25) of the flange (17b) of the at least one half shaft (17) is coaxial to a tapped hole (28) of the flange (13b) of the mechanical system (13) and a tapped hole (26) of the flange (17b) of the at least one half shaft (17) is coaxial to a smooth hole (27) of the flange (13b) of the mechanical system (13), screws (29) each passing through a smooth hole (27, 25) of a flange (13b, 17b) and each screw being engaged in a tapped hole (26, 28) of a flange (17b, 13b).

2. The non-through shaft rotor for an electric machine, connected to a coupling flange (13b) of a mechanical system (13), according to claim 1, wherein the fastening clamp (17a, 18a, 40a, 41a, 42a, 43a) and the coupling flange (17b, 18b, 40b, 41b, 42b, 43b) of a half shaft are connected by a middle shaft (17c, 18c, 40c, 41c, 42c, 43c).

3. The non-through shaft rotor for an electric machine, connected to a coupling flange (13b) of a mechanical system (13), according to claim 2, wherein the middle shafts (17c, 18c, 40c, 41c, 42c, 43c) have different lengths.

4. The non-through shaft rotor for an electric machine, connected to a coupling flange (13b) of a mechanical system (13), according to any of claims 1 to 3, wherein the coupling flanges (17b, 18b, 40b, 41b, 42b, 43b) of the half shafts have a different diameter (d17, d18, d40, d41, d42, d43).

5. The non-through shaft rotor for an electric machine, connected to a coupling flange (13b) of a mechanical system (13), according to any of claims 1 to 4, wherein the outer diameter (d17, d18, d40, d41, d42, d43) from the coupling flange (17b, 18b, 40b, 41b, 42b, 43b) of at least one half shaft is less than or equal to the outer diameter (d16, d38, d39) of the magnetic mass (16, 38, 39).

6. The non-through shaft rotor for an electric machine, connected to a coupling flange (13b) of a mechanical system (13), according to one of claims 1 to 2, wherein the half shafts (17, 18, 40, 41, 42, 43) are identical.

7. The non-through shaft rotor for an electric machine, connected to a coupling flange (13b) of a mechanical system (13), according to claim 1, wherein the through-holes (23, 24, 44, 45) of the flange of a half shaft are distributed in a staggered manner over at least two different diameters (D1, D2) of the flange (17b, 18b, 40b, 41b, 42b, 43b).

8. The non-through shaft rotor for an electric machine, connected to a coupling flange (13b) of a mechanical system (13), according to any of claims 1 to 7, wherein the magnetic mass (16) comprises compacted magnetic sheets (20).

9. The non-through shaft rotor for an electric machine, connected to a coupling flange (13b) of a mechanical system (13), according to any of claims 1 to 7, wherein the magnetic mass (16) comprises a stack of metal plates.

10. The non-through shaft rotor for an electric machine, connected to a coupling flange (13b) of a mechanical system (13), according to one of claims 8 and 9, further comprising tie rods (22) evenly distributed over at least one diameter of the magnetic mass (16, 38, 39) so as to hold the compacted magnetic mass between the half shafts (17, 18), the diameter (d17c) of at least one middle shaft (17c) being greater than the implantation diameter of the tie rods, the outer diameter (d17a) of the fastening clamp (17a) of said half shaft (17) being equal to the diameter (d17c) of the middle shaft, one end of each tie rod being engaged in an internal thread of the middle shaft comprising as many internal threads as tie rods.

11. The non-through shaft rotor for an electric machine, connected to a coupling flange (13b) of a mechanical system (13), according to any of claims 1 to 7, wherein the magnetic mass comprises a one-piece metal body (30).

12. The non-through shaft rotor for an electric machine, connected to a coupling flange (13b) of a mechanical system (13), according to any of claims 1 to 11, wherein the magnetic mass (16, 38, 39) comprises a central recess (34).

13. The non-through shaft rotor for an electric machine, connected to a coupling flange (13b) of a mechanical system (13), according to any of claims 1 to 12, wherein the magnetic mass (16) comprises conductive bars (21) and two short-circuit rings (19a) so as to form a squirrel cage, the short-circuit rings (19a) not being compacted between the fastening clamps (17a, 18a) and the magnetic mass (16).

14. A series rotor assembly (35) comprising at least two non-through shaft rotors (36, 37), each rotor being connected to a coupling flange of a mechanical system and defined according to any of claims 1 to 13, wherein a coupling flange (41b) of a rotor (36) is fastened to a coupling flange (42b) of the other rotor (37) to transmit a torque between the two rotors.

15. The series rotor assembly, each rotor being connected to a coupling flange of a mechanical system, according to claim 14, wherein the coupling flanges (41b, 42b) of the rotors (36, 37) are fastened to each other via an intermediate shaft (46) comprising two coupling flanges (47, 48).

16. The series rotor assembly, each rotor being connected to a coupling flange of a mechanical system, according to claim 15, wherein the intermediate shaft (46) is supported by a bearing (49).

17. A multi-magnetic mass rotor (50), comprising a rotor (37) connected to a coupling flange of a mechanical system and defined according to any of claims 1 to 13, and at least one cylindrical magnetic mass (51) a first end of which is connected to the fastening clamp (52a) of a third half shaft (52) as one-piece and the second end is connected to a coupling flange (42b) of the rotor (37) to transmit a torque between the magnetic masses.

18. A rotary electric machine comprising a rotor (15) according to any of claims 1 to 13, connected to a coupling flange of a mechanical system or a series rotor assembly (35) according to any of claims 14 to 16, each rotor being connected to a coupling flange of a mechanical system or a multi-magnetic mass rotor (50) according to claim 17, connected to a coupling flange of a mechanical system.