Mechanical Drive Systems and Associated Motor Compressors

Abstract

To reduce the weight and dimensions of a mechanical system due to the latest technology, increase the rotating speed of an electrical rotating machine incorporated in the system, and increase the overall performance and power of the system, thereby overcoming all or some of disadvantages of the system.SOLUTION: A mechanical system (12) for a rotary electrical machine (20) comprises at least one rotor (15) and at least one transmission shaft (16) for a mechanical device (13). The rotor has a non-penetrating shaft and comprises a cylindrical magnetic block (21) clamped between first (22) and second (23) raised compaction elements forming a rotor shaft. One end of the transmission shaft is connected directly to the first compaction element.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a mechanical drive system including at least one rotor without a through shaft connected to a transmission shaft.

[0002] The invention also relates to a motor-compressor including such a drive system. [Background technology]

[0003] FIG. 1 shows an example of a motor-compressor 1 comprising a state-of-the-art mechanical drive system including a rotating electric machine 2 connected to a compression section 3 via a flexible coupling device 4 .

[0004] The flexible coupling device 4 comprises two coupling flanges 4a and 4b connected by a shaft 4c. Attached to the flanges 4a and 4b is a flexible lining 4d.

[0005] The rotating electric machine 2 includes a stator 5 in which a rotor 6 having a shaft 6a is inserted through a magnetic sheet 6b and connected to a flange 4a.

[0006] The compression section 3 includes a compression wheel 5 mounted on a shaft 7 of the section 3 .

[0007] The shaft 7 of section 3 is connected to a coupling flange 4b.

[0008] Bearings 8 and 9 keep rotor shaft 6 a of electric machine 2 rotating, and bearings 10 and 11 keep shaft 7 of section 3 rotating.

[0009] The flexible coupling device allows the unique modes of the rotor shaft 6 a and the shaft 7 of the compression section 3 to be decoupled.

[0010] Reference may be made to U.S. Pat. No. 7,144,226, U.S. Pat. No. 8,137,081, U.S. Pat. No. 3,874,823, British Patent No. 282113, and British Patent No. 1068004, which disclose motor-compressors including a flexible coupling device connecting a rotating electric machine to a compression section.

[0011] However, the flexible coupling device 4 increases the weight of the transmission line including the rotor shaft 6 a, the flexible device 4 and the shaft 7 and increases its length L with the axis of rotation A of the motor-compressor 1.

[0012] In addition, bearings 9 and 10 are sized to support the weight of device 4 , which increases with the weight and length of motor-compressor 1 .

[0013] The flexible coupling device 4 also dissipates thermal energy, reducing the overall performance of the motor-compressor 1.

[0014] In addition, if the rotating electric machine includes a rotor with a through shaft, the peripheral speed of the rotor is limited to 200 m / s in order to limit the concentration of binding of the magnetic sheets 6b that may be generated under the effect of centrifugal forces and damage the rotor. This limitation of the rotational speed reduces the performance of the motor-compressor.

[0015] Reference may be made to WO 2015 / 153081, US 2012 / 0164005, EP 1 392 981, EP 1 074 746 and US 2002 / 0037 772, which are documents disclosing motor-compressors including a rotating electric machine including a through shaft or integral rotor directly connected to the shaft of the compression section.

[0016] Because the rotor is one piece, it does not have a through shaft. As a result, the rotational speed of the rotor is not limited. The direct connection between the rotating electric machine and the compression section allows the bearings, such as the bearing 10 shown in FIG. 1 and the flexible coupling device 4 shown in FIG. 1, to be removable.

[0017] The one-piece rotor includes a squirrel cage, made for example of copper, that is inserted directly into a rotor made for example of carbon steel.

[0018] As a result, the currents induced in the squirrel cage circulate in the carbon steel rotor, causing it to heat up ("core losses") and reducing the performance of the rotating machine. Summary of the Invention

[0019] It is therefore proposed to overcome all or some of the disadvantages of state-of-the-art mechanical systems by reducing their weight and size, increasing the rotational speed of the rotating electric machines incorporated in said systems, and increasing the overall performance and power of said systems.

[0020] Based on the above, a mechanical system for a rotating electric machine is proposed, which includes at least one rotor and at least one transmission shaft for a machine.

[0021] The rotor has a blind shaft and has a cylindrical magnetic block enclosed between first and second raised compression elements which form the rotor shaft, with one end of the transfer shaft connected directly to the first compression element.

[0022] According to one feature, the mechanical system also includes a second transmission shaft for the mechanical device, the second transmission shaft being directly connected to the second compression element.

[0023] According to another feature, the mechanical system further includes a second rotor having a blind shaft, the second compression element of the second rotor being directly connected to the second end of the transmission shaft.

[0024] Preferably, the first and second compression elements have the same construction.

[0025] Advantageously, the first or second compression element includes a fixed flange in contact with the magnetic block and integral with the first or second transmission shaft.

[0026] According to one feature, the first or second compression element includes a fixed flange in contact with the magnetic block, and a free end of the first or second compression element includes a coupling sleeve, and the first or second shaft enters the coupling sleeve such that the mechanical torque is transmitted through one of the transmission shaft and the fixed flange.

[0027] Preferably, one end of the first or second transmission shaft includes a first coupling flange, the first or second compression element includes a fixed flange in contact with the magnetic block, and a free end of the first or second compression element includes a second coupling flange connected to the coupling flange of the first or second transmission shaft such that the mechanical torque is transmitted through one of the transmission shaft and the fixed flange.

[0028] According to one feature, the mechanical system also includes a central shaft connecting the fixed flange and the second coupling flange.

[0029] Advantageously, the mechanical system further comprises screws, each screw passing through an open smooth hole in the first coupling flange and held in a threaded hole in the second coupling flange, the threaded holes being uniformly distributed across an embedment diameter of the second flange, the open smooth holes being uniformly distributed across an embedment diameter of the first flange, and the embedment diameters of the holes in the first and second flanges being equal or substantially equal.

[0030] Preferably, the mechanical system further includes tie rods uniformly distributed across a diameter of the magnetic block to maintain the magnetic block compressed between two compression elements, the ends of the tie rods of the first or second compression element being embedded in said compression element, the embedded diameter of the tie rods being smaller than the embedded diameters of the first and second flanges.

[0031] According to one feature, the mechanical system also includes tie rods uniformly distributed over the diameter of the magnetic block so as to maintain the magnetic block compressed between the two compression elements, the ends of the tie rods of the first or second compression element being embedded in said compression element, the embedment diameter of the tie rods being equal or substantially equal to the embedment diameters of the first and second flanges, and the threaded holes alternating with the embedment holes of the tie rods.

[0032] According to yet another feature, the first flange includes a central blind hole and the second flange includes a central pin that receives the blind hole to transmit torque between the first and second flanges.

[0033] Advantageously, the first and second flanges include blind holes uniformly distributed over the same diameter, and the system also includes pins inserted into the blind holes of the first and second flanges to transmit torque between the first and second flanges.

[0034] Preferably, the first or second compression element includes a fixed flange in contact with the magnetic block, a free end of the first or second compression element includes a central through hole, and one end of the first or second transmission shaft enters the through hole such that the mechanical torque is transmitted through one of the shafts and the fixed flange.

[0035] According to another aspect, a motor-compressor is proposed comprising a mechanical drive system as defined above, as many rotating electric machines as there are rotors, and as many mechanical devices as there are transmission shafts, each rotor being inserted into a different electric machine and each transmission shaft being connected to a different mechanical device comprising a compression section.

[0036] Other characteristics and advantages of the invention will become apparent on reading the following description of embodiments of the invention, given by way of non-limiting example only and with reference to the following drawings, in which: [Brief description of the drawings]

[0037] [Figure 1]FIG. 1 shows the motor-compressor, already mentioned, including a mechanical system according to the state of the art. [Diagram 2] FIG. 1 illustrates a first embodiment of a mechanical system. [Diagram 3] FIG. 2 illustrates a second embodiment of a mechanical system. [Figure 4] FIG. 13 illustrates a third embodiment of a mechanical system. [Diagram 5] FIG. 13 illustrates a fourth embodiment of a mechanical system. [Figure 6] FIG. 5 illustrates a fifth embodiment of a mechanical system. [Figure 7] FIG. 13 illustrates a sixth embodiment of a mechanical system. [Figure 8] FIG. 13 illustrates a sixth embodiment of a compression element. [Figure 9] FIG. 13 illustrates a sixth embodiment of a compression element. [Figure 10] FIG. 13 shows a seventh embodiment of a compression element. [Figure 11] FIG. 13 shows a seventh embodiment of a compression element. [Figure 12] FIG. 13 shows an eighth embodiment of a compression element. [Figure 13] FIG. 13 shows an eighth embodiment of a compression element. [Figure 14] FIG. 13 illustrates a ninth embodiment of a compression element. [Figure 15] FIG. 13 illustrates a ninth embodiment of a compression element. [Figure 16] FIG. 13 illustrates a ninth embodiment of a mechanical system. [Figure 17] FIG. 13 illustrates a ninth embodiment of a mechanical system. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0038] Reference is now made to FIG. 2, which shows a cross section of a mechanical system 12 connected to a compression section 13 of a first embodiment of a motor-compressor 14, the mechanical system 12 being integrated into the motor-compressor 14.

[0039] The mechanical system 12 includes a rotor 15 including a blind shaft of a central axis B directly connected to a transmission shaft 16 of the compression section 13 .

[0040] The diameter of the transmission shaft 16 is dimensioned according to the torque value to be transmitted.

[0041] The rotor 15 and the transmission shaft 16 are maintained in rotation by two bearings 17 and 18 arranged at the free ends of the rotor 15 and the transmission shaft 16, respectively.

[0042] The bearings 17 and 18 are, for example, bearings on an oil film, on a gas film or with magnetic levitation.

[0043] The rotor 15 is inserted into a stator 19 of an asynchronous squirrel-cage type rotating electrical machine 20 .

[0044] Alternatively, the rotating electrical machine 20 may be a wound rotor machine of the asymmetric or symmetric type, preferably having a wound rotor in which the rotor power supply preferably operates through rings and brushes.

[0045] The blind shaft rotor 15 includes a cylindrical magnetic block 21 enclosed between first and second raised compression elements 22 and 23 which form the rotor shaft.

[0046] One end of the transmission shaft 16 is directly connected to the first compression element 22 .

[0047] The first and second compression elements 23 and 24 have different structures.

[0048] According to the first embodiment, the first compression element 22 is in contact with the magnetic block 21 and comprises a fixed flange 22 a integral with the transmission shaft 16 .

[0049] The fixing flange 22a and the transmission shaft 16 are obtained, for example, by molding or forging.

[0050] According to the second embodiment, the second compression element 23 includes a fixed flange 23a in contact with the magnetic block 21 and an end shaft 23b connected to a free surface of the fixed flange 23a.

[0051] The magnetic block 21 includes two shorting disks 24 and 25 surrounding a compressed magnetic sheet 26, and a conductive bar 27 housed within the magnetic sheet 26 and the shorting disks 24 and 25, such that the shorting disks 24 and 25 and the conductive bar 27 form a squirrel-cage.

[0052] The magnetic sheet 26 is preferably less than 2 mm thick, for example 0.65 mm or 0.5 mm.

[0053] Alternatively, the magnetic block 21 comprises a stack of metal plates, the thickness of which is preferably greater than 5% of the outer diameter of the magnetic block 21 .

[0054] According to yet another variant, the magnetic block 21 comprises a monolithic steel body.

[0055] The tie rods 28 are evenly distributed across the diameter D of the magnetic block 21 so that the magnetic sheet 26 remains compressed between the compression elements 22 and 23 .

[0056] The tie rod 28 passes through smooth holes 43b disposed in the compression elements 22 and 23 and includes a nut on each end to maintain the magnetic sheet 26 in compression.

[0057] The compression section 13 includes a compression wheel 28a mounted on the transmission shaft 16 such that the rotor 15 drives the wheel 28 to rotate to compress the gas.

[0058] Because the rotor 15 has a blind shaft, the peripheral speed of the rotor 15 is not limited to 200 m / s, allowing to improve the performance of the electric machine 20. The higher the rotation speed of the rotor 15, the more power can be generated by the rotating electric machine 20.

[0059] The mechanical system 12 does not have a flexible coupling device between the rotor shaft and the transmission shaft 16, and the bearings that hold the coupling device can be removed.

[0060] The elimination of the flexible coupling device and the bearings that hold said device allows for an improvement in the overall performance of the mechanical power transmission of the mechanical system 12, particularly between the rotor 15 and the compression section 13.

[0061] In addition, removing the flexible coupling device and the bearings that hold said device allows for a reduction in the weight of the mechanical system 12 and a reduction in the length L1 along the axis B of the mechanical system 12, thereby reducing the critical speed of the mechanical system.

[0062] More precisely, the mechanical system 12 may operate at a supercritical rotational speed that is multiple or more than the critical rotational speed, for example two or three times the critical speed.

[0063] Since the length L1 of the mechanical system 12 is shorter than that of state-of-the-art mechanical systems, the number of reduced critical speeds within the operating speed range facilitates the operation of the mechanical system 12.

[0064] For example, the rotor 15 can operate at a peripheral speed of 300 m / s, thereby improving the energy performance of the mechanical system 12 .

[0065] In addition, because the compression element 22 and the transmission shaft 16 are integral, the maximum torque transmitted by the rotor 15 to the compression section 13 is greater than the maximum torque transmitted by known mechanical systems in the state of the art, including flexible devices.

[0066] According to one embodiment, the mechanical system 12 may be integrated with or coupled to any mechanical device, including a transmission shaft.

[0067] In a variant not shown, the fixing flange 22a includes a threaded hole for receiving the tie rod 28 and the fixing flange 23a includes a counterbore for receiving a nut on the other end of the tie rod 28.

[0068] According to yet another variation, the fixing flange 22a includes a counterbore that receives a nut recessed within the fixing flange and secured to the threaded end of the tie rod 28.

[0069] FIG. 3 shows a partial cross-sectional view of a second embodiment of a mechanical system 12 integrated with a second embodiment of a motor-compressor 14 .

[0070] It shows a rotor 15 including a magnetic block 21 enclosed between first and second compression elements 22 and 23 , and the compression section 13 includes a transmission shaft 16 .

[0071] This embodiment differs from the embodiment shown in FIG. 2 in that the second compression element 23 is of identical structure to the first compression element 22 .

[0072] The second compression element 23 includes a fixed flange 23a directly connected to the second transmission shaft 30, and the fixed flange 23a and the second transmission shaft 30 are integral.

[0073] The second transmission shaft 30 is integrated into a second compression section 29 which is identical to the first compression section 13 .

[0074] A rotating electrical machine 20 incorporating the rotor 15 is dimensioned to drive the two compression sections 13 and 29 .

[0075] Generally, the performance of a rotating electrical machine is superior to that of a high-output machine.

[0076] As a result, mechanical system 12 has better overall performance than a system including two rotating electrical machines, each driving a single mechanical device with the same power consumption.

[0077] Additionally, the use of a single rotating electric machine may reduce the overall size and weight of the mechanical system 12.

[0078] FIG. 4 shows a partial cross-sectional view of a third embodiment of a mechanical system 12 integrated with a third embodiment of a motor-compressor 14 .

[0079] It shows a rotor 15 that includes two compression elements 22 and 23 .

[0080] This embodiment differs from the first and second embodiments shown in Figures 2 and 3 above in that it includes a second rotor 31 and a mechanical device 32 having the same structure as rotor 15, the second rotor 31 being incorporated in a second rotating electric machine (not shown) having the same architecture as rotating electric machine 20.

[0081] The second rotor 31 includes a magnetic block 33 having the same structure as the magnetic block 21 of the rotor 15 surrounded by first and second compression elements 35 and 34 .

[0082] According to another embodiment, the architecture of the second rotating electric machine may be different from the architecture of the rotating electric machine 20 .

[0083] According to yet another embodiment, the magnetic blocks 33 of the second rotor 31 may be of a different construction than the magnetic blocks 21 of the rotor 15 .

[0084] For example, the magnetic block 33 may include a thick plate replacing the magnetic sheet.

[0085] The first and second compression elements 23 and 35 of rotors 15 and 31 are of identical structure, with the second compression element 23 including a fixed flange 23a in contact with the magnetic block 21 and an end shaft 23b connected to the free surface of the fixed flange 23a, and the first compression element 35 including a fixed flange 35a in contact with the magnetic block 33 and an end shaft 35b connected to the free surface of the fixed flange 35a.

[0086] The diameters of shafts 23b and 35b may be the same or different.

[0087] The machine 32 includes a transmission shaft 32a.

[0088] The first compression element 22 of the rotor 15 includes a fixed flange 22a in contact with the magnetic block 21 and integral with a first end of the transmission shaft 32a, and the second compression element 34 of the rotor 31 includes a fixed flange 34a in contact with the magnetic block 33 and integral with a second end of the transmission shaft 32a.

[0089] According to alternative embodiments, the compression elements of rotors 15 and 31 may be of different construction.

[0090] The mechanical system 12 including two rotating electric machines connected to the transmission shaft 32a makes it possible to drive a very high power mechanical device 32 that cannot be driven by a single rotating electric machine.

[0091] Thus, mechanical system 12 is more compact, has reduced weight, and provides better overall performance than a system having two mechanical devices, each coupled to a rotating electric machine.

[0092] Thanks to its compact size and reduced number of bearings, the mechanical system described in Figures 3 and 4 allows operation at supercritical rotational speeds or multiples of the critical rotational speed.

[0093] The two small diameter rotors 15 and 31 coupled to the mechanical device 32 allow operation at peripheral speeds of more than 200 m / s, for example 300 m / s, improving the overall performance of the mechanical system 12 .

[0094] Additional embodiments of compression elements 22, 23, 34, and 35 are now detailed.

[0095] Compression elements 22, 23, 34, and 35 include one of the structures detailed in the following embodiments, and the first and second compression elements of the same rotor may be of the same or different structures.

[0096] FIG. 5 illustrates a partial view of a fourth embodiment of a mechanical system 12 including a third embodiment of a compression element 22.

[0097] This shows the rotor 15 including the first compression element 22 and the transmission shaft 16 .

[0098] The compression element 22 includes a fixed flange 22 a in contact with the magnetic block 21 .

[0099] The free end of the compression element 22 includes a coupling sleeve 36 into which the transmission shaft 16 is received such that mechanical torque is transmitted through the transmission shaft 16 and the fixed flange 22a.

[0100] The inner and outer diameters of the sleeve 36 are sized to correspond to the diameter of the shaft 16 .

[0101] The transmission shaft 16 is retained within the sleeve 36, for example by pinning, shrink fitting, or threading into a tapped hole.

[0102] According to another embodiment, the shaft 16 may include a groove that cooperates with a groove present around the inner diameter of the sleeve 36 .

[0103] The rotor 15 including the sleeve 36 and the mechanical device including the shaft 16 may be manufactured independently of each other and then assembled together.

[0104] This allows the mechanical system to be transported in several modules, including, for example, a first module including the electric machine 20 and a second module including the compression section 13 .

[0105] FIG. 6 illustrates a partial view of a fifth embodiment of a mechanical system 12 including a fourth embodiment of a compression element 22.

[0106] This embodiment of the compression element 22 differs from the third embodiment shown in FIG. 5 above in that the fixing flange 22a includes a central through hole 37 that extends into the coupling sleeve 36, defining a fourth embodiment of the compression element 22.

[0107] The third and fourth embodiments of the compression element 22 facilitate the implementation of the compression wheel 28 by allowing a smaller end to be manufactured for the transmission shaft 16, for example by allowing it to be implemented at two ends of the shaft 16.

[0108] Alternatively, the inner diameter of the sleeve 36 may be threaded, conical, or polygonal to transmit even greater torque.

[0109] The third embodiment allows operation at higher rotational speeds than the fourth embodiment, but transmits less torque than the fourth embodiment.

[0110] FIG. 7 illustrates a partial cross-sectional view of a sixth embodiment of a mechanical system 12 including a fifth embodiment of a compression element 22.

[0111] This shows the rotor 15 and the transmission shaft 16 .

[0112] One end of the transmission shaft 16 includes a first coupling flange 38 .

[0113] The compression element 22 includes a fixed flange 22 a in contact with the magnetic block 21 .

[0114] The free end of the compression element 22 includes a second coupling flange 39, and the first and second coupling flanges 38 and 39 are connected to one another such that mechanical torque is transmitted through the transmission shaft 16 and the fixed flange 22a.

[0115] The fixed flange 22 a and the second coupling flange 39 are connected by a central shaft 40 .

[0116] The coupling flanges are connected to one another, for example by means of screws 41 , each screw 41 passing through an open smooth bore 42 in the first coupling flange 38 and being held in a threaded bore 43 in the second coupling flange 39 .

[0117] The threaded holes 43 are uniformly distributed over the embedment diameter D2 of the second flange 39, and the open smooth holes 42 are uniformly distributed over the embedment diameter D1 of the first flange 38, and the embedment diameters D1 and D2 of the first and second flanges are equal or substantially equal.

[0118] According to another embodiment, the compression element 22 does not have a central shaft 40 .

[0119] According to yet another embodiment, when the compression element 22 includes a central shaft 40, the smooth bore 42 and the threaded bore 43 are inserted into the second and first coupling flanges 39 and 38, respectively.

[0120] Alternatively, the coupling flanges 39 and 38 include smooth holes 42 into which the coupling bolts are inserted, for example screws and nuts, or threaded studs with one nut held at the end of each stud.

[0121] The rotor 15 and the transmission shaft 16 can be easily separated by removing the screw 41 and easily connected by tightening the screw 41 .

[0122] 8 and 9 show a partial cross-sectional view and a side view of a sixth embodiment of a compression element 22 including a second embodiment of a second coupling flange 39.

[0123] This shows the rotor 15 including the compression element 22 .

[0124] This embodiment differs from the above embodiment shown in FIG. 7 in that the compression element 22 does not include a central shaft 40 and in that the compression element 22 includes a counterbore 44 that accommodates a nut 45 that holds the magnetic sheet 26 in a compressed state such that the end of the tie rod 28 of the compression element 22 is embedded in said compression element, the tie rod passing through a smooth hole 43b inserted in the fixing flange 22a.

[0125] The embedded diameter D of the tie rod 28 is smaller than the embedded diameters of the holes 43 and 42 of the first and second flanges 38 and 39 .

[0126] The fixing flange 22a and the coupling flange 39 form a single piece, and the threaded holes 43 are formed in the fixing flange 22a and are uniformly distributed over the embedment diameter D2.

[0127] In a variant not shown, the holes 43 are evenly distributed over two different diameters of the fixing flange 22a in order to transmit a greater torque to the coupling flange 38 of the shaft 16 provided with two rows of retaining screws 41.

[0128] 10 and 11 show partial cross-sectional and side views of a seventh embodiment of compression element 22. FIG.

[0129] These show a rotor 15 including a compression element 22 .

[0130] This embodiment differs from the above embodiment shown in FIG. 8 in that the embedment diameter D of the tie rod 28 is equal or substantially equal to the embedment diameter D2 of the threaded holes 43 in the second coupling flange 39, the threaded holes 43 alternating with the embedment holes 46 of the tie rod 28.

[0131] The ends of the tie rods 28 are retained within the threaded holes 46 such that the end of each tie rod 28 is embedded within the compression element 22 .

[0132] In a variant not shown, the embedding diameter D2 of the screw hole 43 is larger than the diameter D of the tie rod 28.

[0133] According to another variant not shown, the screw holes 43 are arranged at two different embedding diameters.

[0134] According to yet another variant not shown, the embedding diameter D2 of the threaded hole 43 is smaller than the diameter D of the tie rod 28.

[0135] The sixth and seventh embodiments of the compression element 22 allow the mechanical device including the rotor 15 and the transmission shaft 16 to be manufactured independently of each other and then assembled together, allowing the mechanical system to be transported in several separate modules.

[0136] 12 and 13 show partial cross-sectional views of a seventh embodiment of a mechanical system 12 including an eighth embodiment of a compression element 22. In FIG.

[0137] These show a rotor 15 including a compression element 22 including a third embodiment of a second flange 39 and a transmission shaft 16 including a second embodiment of a first flange 38 .

[0138] In this embodiment of the mechanical system 12, the first flange 38 differs from the first embodiment of the flange 38 shown in FIG. 7 in that the first flange 38 includes a countersink 47 into which a screw head 48 that connects the first and second flanges 38 and 39 is inserted, and in that the first flange 38 includes a central blind hole 50 including a central axis that is aligned or substantially aligned on the axis B.

[0139] Additionally, in this embodiment, the second flange 39 differs from the second embodiment of the flange 39 shown in FIG. 8 in that it includes a central pin 49 that fits within a blind hole 50 with or without clearance space to transmit torque between the first and second flanges 38 and 39.

[0140] The pins 49 may be, for example, square, polygonal, or triangular.

[0141] The pin 49 in the hole 50 allows for greater torque to be transmitted than previous embodiments that do not include an integral shaft and fixed flange or that do not include the pin 49 .

[0142] Alternatively, pin 49 may be an asymmetric polygon, allowing for angular indexing between flanges 38 and 39 .

[0143] According to another variant, the pin 49 is cylindrical, allowing radial blocking between the flanges 38 and 39 .

[0144] According to yet another embodiment, the pin 49 is disposed within the first flange 38 and the blind hole 50 is disposed within the second flange 39 .

[0145] 14 and 15 show partial cross-sectional views of an eighth embodiment of a mechanical system 12 including a ninth embodiment of a compression element 22. In FIG.

[0146] These show a rotor 15 including a compression element 22 including a fourth embodiment of the second flange 39 , and a transmission shaft 16 including a third embodiment of the first flange 38 and a pin 51 .

[0147] The pins 51 may have a variety of shapes, for example rectangular, polygonal, or circular.

[0148] In this embodiment, the first flange 38 differs from the first embodiment of the flange 38 shown in FIG. 7 in that the first flange 38 includes a counterbore 47 into which a nut 48a of a threaded stud 48b connecting the first and second flanges 38 and 39 is inserted, and in that the first flange 38 includes a central blind hole 52 that is uniformly distributed over the diameter D3.

[0149] In addition, in this embodiment, the second flange 39 differs from the second embodiment of the flange 39 shown in FIG. 8 in that it includes blind holes 53 that are uniformly distributed over the diameter D3 so that the pins 51 are inserted into the blind holes 52 and 53.

[0150] Pin 51 inserted into blind holes 52 and 53 allows for greater torque transmission than embodiments of the mechanical system that do not include a pin or an integral shaft and fixed flange.

[0151] Flanges 38 and 39 include at least two blind holes 52 and 53 each configured to receive a pin 51 .

[0152] In a variant not shown, the pin 51 is embedded in two different embedding diameters.

[0153] The pin 51 is inserted into the blind holes 52 and 53 with or without clearance space and may be bonded or fretting into one or both blind holes 52,53.

[0154] 16 and 17 show partial cross-sectional views of a ninth embodiment of a mechanical system 12 including a tenth embodiment of a compression element 22. FIG.

[0155] These show a rotor 15 including a compression element 22 including a fixed flange 22 a, and a transmission shaft 16.

[0156] The fixing flange 22a includes a smooth bore 43b topped by a counterbore 44 which receives a nut 45 to retain the compressed magnetic sheet 26, and a central open threaded bore 55.

[0157] The transfer shaft 16 includes a threaded central pin 56 .

[0158] A central pin 56 is held within the central threaded hole 55 such that mechanical torque is transmitted through the transmission shaft 16 and the fixed flange 22a.

[0159] The shaft 16 includes a shoulder that abuts against the fixed flange when the central pin 56 is fully threaded into the central threaded hole 55 .

[0160] In a variant, the transmission shaft 16 does not include a shoulder so that when the threaded end of the shaft 16 is fully screwed into the central threaded hole 55, the end of the shaft 16 rests against the magnetic block 21, for example against the shorting disk 24.

[0161] According to another embodiment, the central hole 55 and pin 56 do not include threading or tapping, but are entered by, for example, fretting, pinning, or soldering.

[0162] According to yet another embodiment, the transmission shaft 16 does not include a central pin 56 since the end of the shaft 16 is received within the central bore 55 .

[0163] Alternatively, the end of the pin 56 or shaft 16 may be conical or polygonal or include grooves to transmit greater torque.

[0164] The embodiment described in figures 5 to 17 allows the rotor 15, the transmission shaft 16 and the machine incorporating the shaft 16 to be manufactured independently, which facilitates in particular logistics and handling.

[0165] Of course, in the above embodiment, the tie rod 28 may be held within the compression element by a nut recessed within the compression element, or may be held within a thread inserted within the compression element such that the end of the tie rod does not extend beyond the compression element, particularly to ensure accurate contact between the fixing flange and the coupling flange of the shaft 16.

[0166] In the previously disclosed embodiments, the rotating electrical machine operates in a motor mode.

[0167] Of course, rotating electrical machines can be operated in a generator mode to generate electrical power.

[0168] In this mode of operation, the mechanical system 12 is driven by a mechanical power generating device, such as, for example, a gas or steam turbine, with a shaft or transmission shaft 16 driving a rotor(s).

[0169] According to another operating mode, the first fixed flange of the rotor 15 can drive a mechanical device that consumes mechanical power, such as a compressor, and the second fixed flange of the rotor 15 can be driven by a mechanical device that generates mechanical power, such as an electric motor, an internal combustion engine, especially a diesel engine, a gas turbine, or a steam turbine.

[0170] Of course, the rotor 15 may include identical or different fixing flanges 22a and 23a according to one of the embodiments described in Figures 2 to 17.

[0171] The embodiments of the mechanical system 12 described above allow for, among other things, reducing the weight and size of the mechanical system while increasing the rotational speed of the rotating electrical machines incorporated in the system in order to increase the overall performance and power transmitted through said system. [Explanation of symbols]

[0172] 1 Motor Compressor 2 Rotating Electric Machines 3. Compression Section 4 Flexible coupling device, flexible device 4a Coupling flange 4b Coupling flange 4c shaft 4d Flexible Lining 5 Stator, compression wheel 6 Rotor 6a rotor shaft 6b Magnetic sheet 7 Shaft 8. Bearings 9. Bearings 10. Bearings 11 Bearings 12 Mechanical Systems 13 First compression section 14 Motor Compressor 15 Rotor 16 Transmission shaft 17 Bearings 18 Bearings 19 Stator 20 Rotating motor, asynchronous squirrel cage type rotating motor 21 Magnetic Block 22 First compression element 22a Fixed flange 23 Second compression element 23a Fixed flange 23b End shaft 24 Shorting disc 25 Shorting disc 26 Magnetic Sheet 27 Conductive Bar 28 Tie rod, compression wheel 28a compression wheel 29 Second Compression Section 30 Second transmission shaft 31 Second rotor 32 Mechanical equipment 32a Transmission shaft 33 Magnetic Block 34 Second compression element 34a Fixed flange 35 First compression element 35a Fixed flange 35b End shaft 36 Coupling sleeve 37 Center through hole 38 First coupling flange 39 Second coupling flange 40 Central Shaft 41 Screw 42 Smooth Hole 43 Screw hole 43b Smooth hole 44 Counterbore 45 Nut 46 screw holes 47 Counterbore 48 Screw head 48a Nut 48b Stud 49 Center pin 50 Blind Hole 51 pin 52 Blind Hole 53 Blind Hole 55 screw hole 56 pin D Embedded diameter D1 Embedded diameter D2 Embedded diameter D3 diameter

Claims

1. A mechanical system (12) for a rotating electric machine (20), the mechanical system comprising: at least one rotor (15, 31), said rotor (15, 31) having a blind shaft and including a cylindrical magnetic block (21) enclosed between a first compression element (22, 35) and a second compression element (23, 34) forming a rotor shaft, said first compression element (22, 35) including a fixed flange (22a) in contact with said magnetic block (21), said first compression element (22, 35) further including a second coupling flange (39) at its free end; At least one transmission shaft (16, 30, 32a) for a machine (13, 29, 32), including a first transmission shaft (16, 30a); a plurality of tie rods (28), all of the plurality of tie rods (28) being uniformly distributed across an embedment diameter (D) of the tie rods (28) within the magnetic block (21) so as to maintain the magnetic block (21) compressed between the first compression element (22, 35) and the second compression element (23, 34); one end of the first transmission shaft (16, 30a) includes a first coupling flange (38) directly connected to the second coupling flange (39), the first transmission shaft (16, 30a) being directly connected to the first compression element (22, 35) of the at least one rotor (15, 31).

2. The mechanical system of claim 1, further comprising a second transmission shaft (30) for a mechanical device, said second transmission shaft (30) being directly connected to said second compression element (23).

3. 2. The mechanical system of claim 1, further comprising a second rotor (31) having a blind shaft, the second compression element (34) of the second rotor (31) being directly connected to a second end of the first transmission shaft (32a).

4. The mechanical system of claim 1 , wherein the first compression element (22, 35) and the second compression element (23, 34) are of identical construction.

5. The mechanical system of claim 1 , wherein the second compression element (23, 34) includes a fixed flange (23a) in contact with the magnetic block (21).

6. The mechanical system of claim 1, further comprising a central shaft (40) connecting the fixed flanges (22a, 23a) and a second coupling flange (39).

7. 2. The mechanical system of claim 1, further comprising screws (41, 48), each screw passing through an open smooth bore (42) of the first coupling flange (38) and held within a threaded bore (43) of the second coupling flange (39), the threaded bores (43) being uniformly distributed across an embedment diameter (D2) of the second coupling flange (39), the open smooth bores (42) being uniformly distributed across an embedment diameter (D1) of the first coupling flange (38), and the embedment diameters (D1, D2) of the first and second coupling flanges (38, 39) being equal or substantially equal.

8. 8. The mechanical system of claim 7, wherein ends of the plurality of tie rods (28) in the first or second compression element (22, 23) are embedded in the first or second compression element (22, 23), and the embedded diameters (D) of the plurality of tie rods (28) are smaller than the embedded diameters (D1, D2) of the first and second coupling flanges (38, 39).

9. 8. The mechanical system of claim 7, wherein ends of the tie rods (28) in the first or second compression element (22, 23) are embedded in the first or second compression element (22, 23), the embedded diameters (D) of the tie rods (28) are equal or substantially equal to the embedded diameters (D1, D2) of the first and second coupling flanges (38, 39), and the threaded holes (43) alternate with embedded holes (46) of the tie rods (28).

10. 2. The mechanical system of claim 1, wherein the first coupling flange (38) includes a central blind hole (50) and the second coupling flange (39) includes a central pin (49) that enters the blind hole (50) to transmit torque between the first and second flanges (38, 38).

11. 2. The mechanical system of claim 1, wherein the first and second coupling flanges (38, 39) include blind holes (52, 53) uniformly distributed over the same diameter (D3), and the mechanical system also includes pins (51) inserted into the blind holes of the first and second coupling flanges (38, 39) for transmitting torque between the first and second coupling flanges (38, 39).

12. 12. The mechanical system according to claim 1, a motor-compressor (14) comprising a rotating electric machine (20) in the same number as the rotors (15, 31) and a mechanical device (13, 29, 32) in the same number as the transmission shafts (16, 30, 32a), each rotor (15, 31) being inserted in a respective electric machine and each transmission shaft (16, 30, 32a) being connected to a respective mechanical device comprising a compression section.

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