Generator, extended-range power assembly and extended-range electric vehicle

Abstract

The invention provides a generator, an extended-range power assembly and an extended-range electric vehicle. The generator comprises a plurality of direct connection rotor punching sheets and a plurality of fin rotor punching sheets, and the inner diameter of each direct connection rotor punching sheet is smaller than that of each fin rotor punching sheet. Wherein each direct connection rotor punching sheet is fixedly sleeved on a motor shaft of the generator. The plurality of fin rotor punching sheets are divided into two groups and are respectively fixed on two sides of the plurality of direct connection rotor punching sheets along the axial direction of the generator, or the plurality of fin rotor punching sheets are fixed on the same side of the plurality of direct connection rotor punching sheets along the axial direction of the generator. For rotor cores with different lengths, different hubs do not need to be designed, and the motor shaft can drive the rotor cores to rotate by designing the direct-connection rotor punching sheets and the fin rotor punching sheets with different inner diameters, so that the normalized design of the rotor cores is realized, and the overall performance and reliability of the generator are ensured.

Description

Technical Field

[0001] This application relates to the technical field of motors, and particularly to a generator, an extended-range powertrain, and an extended-range electric vehicle. Background Art

[0002] Generally, the diameter of the rotor core of the motor rotor of the generator in the extended-range powertrain is relatively large. The design of the generator needs to comprehensively consider two factors of weight reduction and strength to ensure the overall performance and reliability of the generator. In the prior art, in order to be compatible with the two factors of weight reduction and strength, a hub is usually selected to connect the rotor core of the generator and the motor shaft. However, for rotor cores of different lengths, different hubs need to be designed, and it is difficult to achieve the normalized design of the rotor core. Summary of the Invention

[0003] This application provides a generator, an extended-range powertrain, and an extended-range electric vehicle, which can achieve the normalized design of the rotor core, ensure the overall performance and reliability of the generator. Thereby, it is beneficial to the high performance of the extended-range powertrain, and further improves the driving range of the electric vehicle.

[0004] In a first aspect, an embodiment of this application provides a generator, which includes a plurality of direct-connected rotor laminations and a plurality of finned rotor laminations. The inner diameter of each direct-connected rotor lamination is smaller than the inner diameter of each finned rotor lamination. Among them, each direct-connected rotor lamination is fixedly sleeved on the motor shaft of the generator. The plurality of finned rotor laminations are divided into two groups and respectively fixed on both sides of the plurality of direct-connected rotor laminations along the axial direction of the generator, or the plurality of finned rotor laminations are fixed on the same side of the plurality of direct-connected rotor laminations along the axial direction of the generator.

[0005] The generator provided by the embodiment of this application designs two types of rotor laminations with different inner diameters. The direct-connected rotor laminations with a smaller inner diameter are directly fixedly sleeved on the motor shaft, and the finned rotor laminations with a larger inner diameter are fixedly connected to the direct-connected rotor laminations. Thus, when the motor shaft rotates, it can drive the rotation of the direct-connected rotor laminations fixed on the motor shaft. Furthermore, the rotation of the direct-connected rotor laminations drives the rotation of the finned rotor laminations, realizing the rotation of the rotor core driven by the motor shaft.

[0006] It can be seen that for rotor cores of different lengths, there is no need to design different hubs. The rotation of the rotor core driven by the motor shaft can be realized by designing direct-connected rotor laminations and finned rotor laminations with different inner diameters, thereby achieving the normalized design of the rotor core and ensuring the overall performance and reliability of the generator.

[0007] In addition, since the fin rotor punching is fixed to the direct-connection rotor punching and not fixed to the motor shaft, the inner diameter of the fin rotor punching can be set larger than the diameter of the motor shaft. Thus, the structure of the fin rotor punching can not only achieve weight reduction but also save space along the axial direction of the generator for the rotor core. That is to say, even without using a hub, the rotor core provided by the embodiment of the present application can achieve the purpose of weight reduction and saving space along the axial direction of the generator for the rotor core by using a hub.

[0008] In one implementation, the shaft diameter of the section of the motor shaft extending into one set of fin rotor punchings is larger than the shaft diameter of the section of the motor shaft extending into another set of fin rotor punchings, and the number of fin rotor punchings in one set of fin rotor punchings is less than the number of fin rotor punchings in another set of fin rotor punchings.

[0009] For example, in order to achieve the axial positioning of the direct-connection rotor punching, the shaft diameters of the two sections of the motor shaft extending into the two sets of fin rotor punchings can be set larger than the shaft diameter of the section of the motor shaft extending into multiple direct-connection rotor punchings. However, the shaft diameters of the two sections of the motor shaft extending into the two sets of fin rotor punchings may be inconsistent. Thus, setting the number of fin rotor punchings in the set of fin rotor punchings into which the section of the motor shaft with a larger shaft diameter extends to be less, and setting the number of fin rotor punchings in the set of fin rotor punchings into which the other section of the motor shaft with a smaller shaft diameter extends to be more, can reduce the unbalance of the motor rotor, and further ensure the stable and efficient operation of the generator.

[0010] For example, the space sizes between the left and right sides of multiple direct-connection rotor punchings and the generator housing along the axial direction of the generator are inconsistent, such that the number of the two sets of fin rotor punchings that can be accommodated between the left and right sides of multiple direct-connection rotor punchings and the generator housing is inconsistent. Thus, setting the shaft diameter of the section of the motor shaft extending into the set of fin rotor punchings with a smaller number of fin rotor punchings to be larger, and setting the shaft diameter of the other section of the motor shaft extending into the set of fin rotor punchings with a larger number of fin rotor punchings to be smaller, can reduce the unbalance of the motor rotor, and further ensure the stable and efficient operation of the generator.

[0011] In one implementation, the number of fin rotor punchings in one set of fin rotor punchings is less than the number of fin rotor punchings in another set of fin rotor punchings, and the inner diameter of each fin rotor punching in one set of fin rotor punchings is smaller than the inner diameter of each fin rotor punching in another set of fin rotor punchings.

[0012] For example, the space sizes between multiple directly-connected rotor laminations and the generator housing on the left and right sides along the axial direction of the generator are inconsistent, such that the number of two sets of finned rotor laminations that can be accommodated between the left and right sides of the multiple directly-connected rotor laminations and the generator housing is inconsistent. Thus, by setting the inner diameter of the set of finned rotor laminations with a smaller number of finned rotor laminations to be smaller and the inner diameter of the other set of finned rotor laminations with a larger number of finned rotor laminations to be larger, the unbalance amount of the motor rotor can be reduced, thereby ensuring that the generator can operate stably and efficiently.

[0013] In one implementation, each finned rotor lamination includes a plurality of magnet through-holes, and the plurality of magnet through-holes of each finned rotor lamination are arranged at intervals along the circumferential direction of the generator. Among them, the cross-sectional area of each magnet through-hole of each finned rotor lamination in one set of finned rotor laminations is smaller than the cross-sectional area of each magnet through-hole of each finned rotor lamination in the other set of finned rotor laminations.

[0014] By adjusting the sizes of the magnet through-holes of the two sets of finned rotor laminations on the left and right sides of the multiple directly-connected rotor laminations, the unbalance amount of the generator can be adjusted again, further ensuring that the generator can operate stably and efficiently.

[0015] In one implementation, one end plate of the generator is distributed on one side of one set of finned rotor laminations facing away from the multiple directly-connected rotor laminations, and the other end plate of the generator is distributed on one side of the other set of finned rotor laminations facing away from the multiple directly-connected rotor laminations, and the inner diameter of one end plate is smaller than the inner diameter of the other end plate.

[0016] By adjusting the sizes of the inner diameters of the two end plates on the left and right sides of the two sets of finned rotor laminations, the unbalance amount of the generator can be adjusted again, further ensuring that the generator can operate stably and efficiently.

[0017] In one implementation, the shaft diameters of the two sections of the motor shaft extending into the two sets of finned rotor laminations are equal, and the number of finned rotor laminations in the two sets of finned rotor laminations is equal.

[0018] For example, in order to achieve the axial positioning of the directly-connected rotor laminations, compared with the shaft diameter of the section of the motor shaft extending into the multiple directly-connected rotor laminations, the shaft diameters of the two sections of the motor shaft extending into the two sets of finned rotor laminations can be set to be larger. However, there may be a situation where the shaft diameters of the two sections of the motor shaft extending into the two sets of finned rotor laminations are the same. Thus, the number of finned rotor laminations in the two sets of finned rotor laminations is set to be the same to ensure the dynamic balance of the motor rotor, thereby ensuring that the generator can operate stably and efficiently.

[0019] For example, there is sufficient space between the multiple directly-connected rotor laminations and the generator housing on both the left and right sides along the axial direction of the generator, such that the number of two sets of finned rotor laminations that can be accommodated between the left and right sides of the multiple directly-connected rotor laminations and the generator housing can be kept consistent. Thus, the shaft diameters of the two sections of the motor shaft extending into the two sets of finned rotor laminations are set to be the same to ensure the dynamic balance of the motor rotor, and further ensure that the generator can operate smoothly and efficiently.

[0020] In one implementation, the number of finned rotor laminations in the two sets of finned rotor laminations is equal, and the inner diameters of each finned rotor lamination in the two sets of finned rotor laminations are equal.

[0021] For example, there is sufficient space between the multiple directly-connected rotor laminations and the generator housing on both the left and right sides along the axial direction of the generator, such that the number of two sets of finned rotor laminations that can be accommodated between the left and right sides of the multiple directly-connected rotor laminations and the generator housing can be kept consistent. Thus, the inner diameters of the two sets of finned rotor laminations are set to be the same to ensure the dynamic balance of the motor rotor, and further ensure that the generator can operate smoothly and efficiently.

[0022] In one implementation, each finned rotor lamination includes a plurality of magnet through-holes, and the plurality of magnet through-holes of each finned rotor lamination are arranged at intervals along the circumferential direction of the generator. Among them, the cross-sectional areas of each magnet through-hole of each finned rotor lamination in the two sets of finned rotor laminations are equal.

[0023] The cross-sectional areas of the magnet through-holes of the two sets of finned rotor laminations on the left and right sides of the multiple directly-connected rotor laminations are set to be the same to further ensure the dynamic balance of the motor rotor, and further ensure that the generator can operate smoothly and efficiently.

[0024] In one implementation, one end plate of the generator is distributed on one side of a set of finned rotor laminations facing away from the multiple directly-connected rotor laminations, and the other end plate of the generator is distributed on one side of the other set of finned rotor laminations facing away from the multiple directly-connected rotor laminations, and the inner diameter of one end plate is equal to the inner diameter of the other end plate.

[0025] The inner diameters of the two end plates on the left and right sides of the two sets of finned rotor laminations are set to be the same to further ensure the dynamic balance of the motor rotor, and further ensure that the generator can operate smoothly and efficiently.

[0026] In one implementation, the shaft diameter of a section of the motor shaft extending into multiple finned rotor laminations on the same side of the multiple directly-connected rotor laminations is greater than the shaft diameter of another section of the motor shaft extending into the multiple directly-connected rotor laminations.

[0027] Since the inner diameter of the finned rotor punching is larger than that of the direct-connected rotor punching, fixing multiple finned rotor punchings on the same side of multiple direct-connected rotor punchings will cause uneven mass of the rotor core of the motor rotor, resulting in dynamic imbalance of the motor rotor. Compared with the shaft diameter of the other shaft of the motor shaft extending into multiple direct-connected rotor punchings, setting the shaft diameter of the shaft of the motor shaft extending into multiple finned rotor punchings larger can reduce the unbalance amount of the motor rotor, thereby ensuring that the generator can operate smoothly and efficiently.

[0028] In one implementation, each direct-connected rotor punching and each finned rotor punching respectively include a plurality of magnet through-holes, and the plurality of magnet through-holes of each direct-connected rotor punching and the plurality of magnet through-holes of each finned rotor punching are arranged at intervals along the circumferential direction of the generator. Among them, the cross-sectional area of each magnet through-hole of each direct-connected rotor punching is larger than the cross-sectional area of each magnet through-hole of each finned rotor punching.

[0029] Compared with the magnet through-holes of the direct-connected rotor punching, setting the cross-sectional areas of the magnet through-holes of multiple finned rotor punchings smaller can adjust the unbalance amount of the generator again, further ensuring that the generator can operate smoothly and efficiently.

[0030] In one implementation, one end plate of the generator is distributed on the side of multiple direct-connected rotor punchings facing away from multiple finned rotor punchings, and the other end plate of the generator is distributed on the side of multiple finned rotor punchings facing away from multiple direct-connected rotor punchings, and the inner diameter of one end plate is smaller than the inner diameter of the other end plate.

[0031] Compared with one end plate arranged adjacent to multiple direct-connected rotor punchings, setting the inner diameter of the other end plate arranged adjacent to multiple finned rotor punchings larger can adjust the unbalance amount of the generator again, further ensuring that the generator can operate smoothly and efficiently.

[0032] In one implementation, the inner diameter of each direct-connected rotor punching is less than or equal to the diameter of the shaft of the motor shaft extending into multiple direct-connected rotor punchings. Thus, the motor shaft and each direct-connected rotor punching are fixed by an interference fit method, thereby simplifying the fixing method between the motor shaft and each direct-connected rotor punching.

[0033] In a second aspect, a range-extended powertrain is provided. The range-extended powertrain includes an engine and a generator as described in any one of the first aspect and any of its implementations, and the engine is used for drivingly connecting to the generator and for driving the generator to generate electricity.

[0034] The overall performance and reliability of the generator provided by the embodiments of the present application are good, which is beneficial to the high performance of the range-extended powertrain.

[0035] In a third aspect, a range-extended electric vehicle is provided. The range-extended electric vehicle includes wheels, a battery pack, and a range-extended powertrain as described in the second aspect. The generator is configured to supply power to the battery pack or the drive motor of the range-extended powertrain.

[0036] The overall performance and reliability of the generator provided in the embodiments of the present application are relatively good, which is conducive to increasing the cruising range of the electric vehicle and improving the driving and riding experience of the electric vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 FIG. is a schematic diagram of a range-extended electric vehicle provided by an embodiment of the present application.

[0038] Figure 2 FIG. is a schematic diagram of a generator provided by an embodiment of the present application.

[0039] Figure 3 FIG. is a schematic diagram of a motor stator of a generator provided by an embodiment of the present application.

[0040] Figure 4 FIG. is a schematic diagram of a rotor core provided by an embodiment of the present application.

[0041] Figure 5 FIG. is a schematic diagram of a directly-connected rotor punching provided by an embodiment of the present application.

[0042] Figure 6 FIG. is a schematic diagram of a finned rotor punching provided by an embodiment of the present application.

[0043] Figure 7 FIG. is a schematic diagram of a generator provided by an embodiment of the present application.

[0044] Figure 8 FIG. is a schematic diagram of a generator provided by an embodiment of the present application.

[0045] Figure 9 FIG. is another schematic diagram of a rotor core provided by an embodiment of the present application.

[0046] Figure 10 FIG. is another schematic diagram of a generator provided by an embodiment of the present application.

[0047] Figure 11 FIG. is another schematic diagram of a generator provided by an embodiment of the present application.

[0048] Figure 12 FIG. is another schematic diagram of a rotor core provided by an embodiment of the present application.

[0049] Figure 13 FIG. is another schematic diagram of a generator provided by an embodiment of the present application.

[0050] Figure 14Another schematic diagram of the rotor core provided by the embodiment of the present application.

[0051] Figure 15 Another schematic diagram of the generator provided by the embodiment of the present application.

[0052] Figure 16 Another schematic diagram of the rotor core provided by the embodiment of the present application.

[0053] Figure 17 Another schematic diagram of the generator provided by the embodiment of the present application.

[0054] Figure 18 and Figure 19 Another schematic diagrams of the generator provided by the embodiment of the present application respectively.

[0055] Figure 20 Another schematic diagram of the direct-connected rotor punching provided by the embodiment of the present application.

[0056] Figure 21 Another schematic diagram of the finned rotor punching provided by the embodiment of the present application.

[0057] Figure 22 and Figure 23 Another schematic diagrams of the generator provided by the embodiment of the present application respectively. Detailed implementation manners

[0058] Next, the technical solutions in the present application will be described with reference to the accompanying drawings.

[0059] The "equal / to be equal to" involved in the present application is not strictly equal / to be equal to, but within the allowable error range.

[0060] In the embodiments of the present application, the same reference numeral represents the same component or the same part. In the embodiments of the present application, for multiple identical parts, only one of the parts may be marked with a reference numeral in the drawings. For other identical parts or components, the reference numeral is equally applicable. In addition, the sizes and dimensions of the parts shown in the drawings are only exemplary.

[0061] Figure 1 A schematic diagram of a range-extended electric vehicle provided by the embodiment of the present application. The range-extended electric vehicle provided by the embodiment of the present application is also called range extended electric vehicle, or simply referred to as REEV.

[0062] Such as Figure 1As shown, the range-extended electric vehicle 1 includes a range-extended power assembly 10 and a power battery 20. Among them, the range-extended power assembly 10 is used to receive power supply from the power battery 20 and convert electrical energy into mechanical energy to drive the wheels of the range-extended electric vehicle 1.

[0063] As Figure 1 shown, the range-extended power assembly 10 includes a generator 100, an engine 400, and a drive motor 500. The engine 400 is used for transmission connection with the generator 100 and driving the generator 100 to generate electricity. The range-extended electric vehicle 1 can switch between two working modes: pure electric mode and range-extended mode. When the range-extended electric vehicle 1 is in the pure electric working mode, the power battery 20 supplies power to the drive motor 500 to drive the range-extended electric vehicle 1. When the power of the power battery 20 is low or exhausted, the engine 400 can be started to switch the range-extended electric vehicle 1 to the range-extended working mode. When the range-extended electric vehicle 1 is in the range-extended working mode, the engine 400 drives the generator 100 to generate electricity, and the generated electrical energy can be used to charge the power battery 20 or supply it to the drive motor 500.

[0064] In one embodiment, the range-extended power assembly 10 further includes at least one of a speed reducer 600 and a speed reducer 700. Among them, the engine 400 is used to drive the generator 100 through the speed reducer 600. The drive motor 500 is used to drive the wheels of the range-extended electric vehicle 1 through the speed reducer 700.

[0065] Figure 2 This is a schematic diagram of the generator provided by the embodiment of the present application. As Figure 2 shown, the generator 100 includes a motor stator 110, a motor rotor 120, and a motor shaft 130. Among them, the central hole of the motor stator 110 is used to accommodate the motor rotor 120. The motor rotor 120 is used for transmission connection with the motor shaft 130, and the motor shaft 130 is used for transmission connection with the engine 400. When the engine 400 controls the rotation of the motor shaft 130 of the generator 100, the motor shaft 130 drives the motor rotor 120 to rotate. The motor rotor 120 rotates relative to the motor stator 110 to generate a magnetic field, so that the motor stator 110 generates an induced electromotive force to realize the power generation of the generator 100.

[0066] Figure 3 This is a schematic diagram of the motor stator of the generator provided by the embodiment of the present application. As Figure 3As shown, the motor rotor 120 of the generator 100 includes a rotor core 121 and a plurality of magnets 122. The rotor core 121 includes a plurality of magnet through holes 123, and the plurality of magnet through holes 123 of the rotor core 121 are arranged at intervals along the circumferential direction of the generator 100. Each magnet through hole 123 of the rotor core 121 is used to accommodate one or more magnets 122. When the motor rotor 120 rotates relative to the motor stator 110, the magnets 122 in the magnet through holes 123 of the rotor core 121 will generate a magnetic field, so that the stator windings of the motor stator 110 generate induced electromotive force.

[0067] In the embodiments of the present application, the circumferential direction of the generator 100 can be understood as the circumferential direction of the motor rotor 120, the circumferential direction of the rotor core 121, the circumferential direction of the motor shaft 130, the circumferential direction of the motor stator 110, the circumferential direction of the direct-connected rotor punching sheet 200, the circumferential direction of the finned rotor punching sheet 300, the circumferential direction of the end plate 140 or 150.

[0068] Generally, the diameter of the rotor core 121 is relatively large. In order to balance the two factors of weight reduction and strength, a hub is used to connect the rotor core 121 of the generator 100 and the motor shaft 130. However, for rotor cores 121 of different lengths, different hubs need to be designed, making it difficult to achieve the normalized design of the rotor core 121.

[0069] Figure 4 It is a schematic diagram of a rotor core provided by an embodiment of the present application. Figure 5 It is a schematic diagram of a direct-connected rotor punching sheet provided by an embodiment of the present application. As Figure 4 shown, the rotor core 121 includes a plurality of direct-connected rotor punching sheets 200, and each direct-connected rotor punching sheet 200 is fixedly sleeved on the motor shaft 130 of the generator 100. As Figure 5 shown, the direct-connected rotor punching sheet 200 includes a central hole O1, and the hole wall of the central hole O1 of the direct-connected rotor punching sheet 200 is the inner circumferential surface of the direct-connected rotor punching sheet 200. The inner circumferential surface of the direct-connected rotor punching sheet 200 is in contact with the outer circumferential surface of the motor shaft 130.

[0070] In one embodiment, the inner diameter ID1 of each direct-connected rotor punching sheet 200 is less than or equal to the diameter D1 of a section of the motor shaft 130. Thus, the motor shaft 130 and each direct-connected rotor punching sheet 200 are fixed by an interference fit method, thus simplifying the fixing method between the motor shaft 130 and each direct-connected rotor punching sheet 200.

[0071] Figure 6 It is a schematic diagram of a finned rotor punching sheet provided by an embodiment of the present application. As Figure 4 shown, the rotor core 121 further includes a plurality of finned rotor punching sheets 300, and the inner diameter ID2 of each finned rotor punching sheet 300 is greater than the inner diameter ID1 of each direct-connected rotor punching sheet 200. As Figure 6As shown, each finned rotor punching 300 includes a central hole O2, and the hole wall of the central hole O2 of each finned rotor punching 300 is the inner peripheral surface of each finned rotor punching 300. Since the inner peripheral surface of the directly-connected rotor punching 200 is in contact with the outer peripheral surface of the motor shaft 130, the inner peripheral surface of each finned rotor punching 300 is spaced from the outer peripheral surface of the motor shaft 130.

[0072] As Figure 5 shown, each directly-connected rotor punching 200 further includes a plurality of magnet through-holes 12311, and the plurality of magnet through-holes 12311 of each directly-connected rotor punching 200 are arranged at intervals along the circumferential direction of the generator 100. As Figure 6 shown, each finned rotor punching 300 further includes a plurality of magnet through-holes 12312, and the plurality of magnet through-holes 12312 of each finned rotor punching 300 are arranged at intervals along the circumferential direction of the generator 100. The plurality of magnet through-holes 12311 of each directly-connected rotor punching 200 communicate with the plurality of magnet through-holes 12312 of each finned rotor punching 300 respectively to form a plurality of magnet through-holes 1231 of the rotor core 121.

[0073] A plurality of finned rotor punchings 300 are fixed to a plurality of directly-connected rotor punchings 200. In other words, a plurality of finned rotor punchings 300 are fixedly connected to a plurality of directly-connected rotor punchings 200.

[0074] In the generator 100 provided by the embodiment of the present application, two types of rotor punchings with different inner diameters are designed. The directly-connected rotor punching 200 with a smaller inner diameter is directly fixedly sleeved on the motor shaft 130, and the finned rotor punching 300 with a larger inner diameter is fixedly connected to the directly-connected rotor punching 200. Thus, the rotation of the motor shaft 130 drives the rotation of the directly-connected rotor punching 200 fixed on the motor shaft 130. Furthermore, the rotation of the directly-connected rotor punching 200 drives the rotation of the finned rotor punching 300, realizing the driving of the rotor core to rotate by the motor shaft 130.

[0075] It can be seen that for rotor cores of different lengths, without designing different hubs, the rotation of the rotor core can be driven by the motor shaft 130 by designing directly-connected rotor punchings 200 and finned rotor punchings 300 with different inner diameters, thereby realizing the normalized design of the rotor core 121 and ensuring the overall performance and reliability of the generator 100.

[0076] In addition, since the finned rotor punching 300 is fixed to the direct-connected rotor punching 200 and not fixed to the motor shaft 130, the inner diameter of the finned rotor punching 300 can be set larger than the diameter of the motor shaft 130. Thus, the structure of the finned rotor punching 300 can not only achieve weight reduction but also save space along the axial direction of the generator 100 for the rotor core. That is to say, even without using a hub, the rotor core provided by the embodiments of the present application can achieve the purpose of weight reduction and saving space along the axial direction of the generator 100 for the rotor core by using a hub.

[0077] In the embodiments of the present application, the axial direction of the generator 100 can be understood as the axial direction of the motor rotor 120, the axial direction of the rotor core 121, the axial direction of the motor shaft 130, the axial direction of the motor stator 110, the axial direction of the direct-connected rotor punching 200, the axial direction of the finned rotor punching 300, and the axial direction of the end plates 140 or 150.

[0078] In one embodiment, as Figure 4 shown, the multiple finned rotor punchings 300 of the generator 100 are divided into two groups of finned rotor punchings 300a and 300b, and the two groups of finned rotor punchings 300a and 300b are respectively fixed to both sides of the multiple direct-connected rotor punchings 200 along the axial direction of the generator 100. In other words, the multiple direct-connected rotor punchings 200 are arranged in sequence along the axial direction of the generator 100 to form a direct-connected rotor core 1211, a part of the multiple finned rotor punchings 300 are arranged in sequence along the axial direction of the generator 100 to form a finned rotor core 1212a, and the other part of the multiple finned rotor punchings 300 are arranged in sequence along the axial direction of the generator 100 to form another finned rotor core 1212b. The two finned rotor cores 1212a and 1212b are fixed to both sides of the direct-connected rotor core 1211 along the axial direction of the generator 100.

[0079] During the rotation of the motor rotor 120, if the mass distribution of the motor rotor 120 is uneven, unbalanced centrifugal forces will be generated, causing the motor rotor 120 to vibrate, and further resulting in the generator 100 not being able to operate smoothly and efficiently.

[0080] In one embodiment, the dynamic unbalance of the motor rotor 120 can be adjusted by at least two of the following: the intervals between the two groups of finned rotor punchings 300a and 300b and the corresponding two sections of the motor shaft 130, the sizes of the magnet through-holes 12132 of the two groups of finned rotor punchings 300a and 300b, the inner diameters of the two end plates 140 and 150, and the numbers of the finned rotor punchings of the two groups of finned rotor punchings 300a and 300b.

[0081] Figure 7A schematic diagram of the generator provided by the embodiment of the present application. As Figure 7 shown, the motor shaft 130 further includes two shafts 132 and 133 that respectively extend into two groups of fin rotor laminations 300a and 300b. In one example, the shaft diameter D2 of one shaft 132 of the motor shaft 130 is greater than the shaft diameter D3 of the other shaft 133 of the motor shaft 130, so that the interval between one shaft 132 of the motor shaft 130 and one group of fin rotor laminations 300a is smaller than the interval between the other shaft 133 of the motor shaft 130 and the other group of fin rotor laminations 300b. Additionally, as Figure 7 shown, the number N1 of the fin rotor laminations 300 of one group of fin rotor laminations 300a is less than the number N2 of the fin rotor laminations 300 of the other group of fin rotor laminations 300b.

[0082] It should be understood that Figures 7 to 10 in the number N1 of the fin rotor laminations 300 of one group of fin rotor laminations 300a shown is one, and the number N2 of the fin rotor laminations 300 of the other group of fin rotor laminations 300b shown is three. Figures 7 to 10 The numbers N1 and N2 of the fin rotor laminations 300 respectively included in the two groups of fin rotor laminations 300a and 300b shown in

[0083] are only examples of the size relationship between the two, and their specific values should not limit the present application.

[0084] For example, the spatial sizes between multiple direct-connection rotor laminations 200 and the housing of the generator 100 are inconsistent on the left and right sides along the axial direction of the generator 100, such that the numbers N1 and N2 of two sets of finned rotor laminations 300a and 300b that can be accommodated between the left and right sides of the multiple direct-connection rotor laminations 200 and the housing of the generator 100 are inconsistent. Thus, setting the shaft diameter D2 of a section of the motor shaft 130 extending into the set of finned rotor laminations 300a with a smaller number of finned rotor laminations 300 larger, and setting the shaft diameter D3 of another section of the motor shaft 130 extending into the other set of finned rotor laminations 300b with a larger number of finned rotor laminations 300 smaller can reduce the rotor core 121 of the motor rotor 120, and further ensure that the generator 100 can operate stably and efficiently.

[0085] Figure 8 A schematic diagram of a generator provided by an embodiment of the present application. In one example, as Figure 8 shown, the number N1 of finned rotor laminations 300 in a set of finned rotor laminations 300a is less than the number N2 of finned rotor laminations 300 in another set of finned rotor laminations 300b. The inner diameter ID2 of each finned rotor lamination 300 in the set of finned rotor laminations 300a is less than the inner diameter ID3 of each finned rotor lamination 300 in the other set of finned rotor laminations 300b, so that the gap between a section of the motor shaft 130 and the set of finned rotor laminations 300a is less than the gap between another section of the motor shaft 130 and the other set of finned rotor laminations 300b.

[0086] For example, the spatial sizes between multiple direct-connection rotor laminations 200 and the housing of the generator 100 are inconsistent on the left and right sides along the axial direction of the generator 100, such that the numbers of two sets of finned rotor laminations 300a and 300b that can be accommodated between the left and right sides of the multiple direct-connection rotor laminations 200 and the housing of the generator 100 are inconsistent. Thus, setting the inner diameter of the set of finned rotor laminations 300a with a smaller number of finned rotor laminations 300 smaller, and setting the inner diameter of the other set of finned rotor laminations 300b with a larger number of finned rotor laminations 300 larger can reduce the unbalance amount of the rotor core 121 of the motor rotor 120, and further ensure that the generator 100 can operate stably and efficiently.

[0087] Figure 9 Another schematic diagram of the rotor core provided by an embodiment of the present application. In one example, as Figure 9As shown, the number N1 of the finned rotor laminations 300 in a set of finned rotor laminations 300a is less than the number N2 of the finned rotor laminations 300 in another set of finned rotor laminations 300b. The cross-sectional area of each magnet through-hole 12132 of each finned rotor lamination 300 in a set of finned rotor laminations 300a is smaller than the cross-sectional area of each magnet through-hole 12132 of each finned rotor lamination 300 in another set of finned rotor laminations 300b. By adjusting the sizes of the magnet through-holes 12132 of the two sets of finned rotor laminations 300a and 300b and the number of the finned rotor laminations of the two sets of finned rotor laminations 300a and 300b, the unbalance amount of the rotor core 121 of the motor rotor 120 can be reduced, thereby ensuring that the generator 100 can operate smoothly and efficiently.

[0088] In the embodiment of the present application, the axial direction of the generator 100 can be understood as the circumferential direction of the motor rotor 120, the circumferential direction of the rotor core 121, the circumferential direction of the motor shaft 130, the circumferential direction of the motor stator 110, the circumferential direction of the directly-connected rotor lamination 200, and the circumferential direction of the finned rotor lamination 300.

[0089] In the embodiment of the present application, the cross-sectional area of the magnet through-hole refers to the area of the magnet through-hole on a plane perpendicular to the axial direction of the generator 100.

[0090] Figure 10 Another schematic diagram of the generator provided by the embodiment of the present application. As Figure 10 shown, the generator 100 includes two end plates 140 and 150. One end plate 140 of the two end plates 140 and 150 is distributed on one side of a set of finned rotor laminations 300a away from a plurality of directly-connected rotor laminations 200, and the other end plate 150 is distributed on one side of another set of finned rotor laminations 300b away from a plurality of directly-connected rotor laminations 200. In one example, as Figure 10 shown, the number N1 of the finned rotor laminations 300 in a set of finned rotor laminations 300a is less than the number N2 of the finned rotor laminations 300 in another set of finned rotor laminations 300b. The inner diameter ID4 of the end plate 140 is smaller than the inner diameter ID5 of the end plate 150. By adjusting the sizes of the inner diameters of the two end plates 140 and 150 and the number of the finned rotor laminations of the two sets of finned rotor laminations 300a and 300b, the unbalance amount of the motor rotor 120 can be reduced, thereby ensuring that the generator 100 can operate smoothly and efficiently.

[0091] Figure 11 Another schematic diagram of the generator provided by the embodiment of the present application. In one example, as Figure 11 shown, the shaft diameters D2 and D3 of the two sections of the motor shaft 130, i.e., 132 and 133, are equal, and the number of the finned rotor laminations 300 in the two sets of finned rotor laminations 300a and 300b is equal.

[0092] For example, in order to achieve the axial positioning of the directly-connected rotor laminations 200, the diameters of the two sections of the motor shaft 130 extending into the two sets of finned rotor laminations 300, namely the shaft sections 132 and 133, can be set larger than the diameter of the section of the motor shaft 130 extending into the multiple directly-connected rotor laminations 200. However, there may be a situation where the diameters of the two sections of the motor shaft 130 extending into the two sets of finned rotor laminations 300 are the same. Therefore, by setting the number of finned rotor laminations 300 in the two sets of finned rotor laminations 300a and 300b to be the same, the unbalance of the motor rotor 120 can be reduced, and thus it can be ensured that the generator 100 can operate smoothly and efficiently.

[0093] For example, the space between the multiple directly-connected rotor laminations 200 and the housing of the generator 100 on the left and right sides along the axial direction of the generator 100 is sufficient, so that the number of the two sets of finned rotor laminations 300 that can be accommodated between the left and right sides of the multiple directly-connected rotor laminations 200 and the housing of the generator 100 can be kept the same. Therefore, by setting the diameters of the two sections of the motor shaft 130 extending into the two sets of finned rotor laminations 300a and 300b to be the same, the unbalance of the motor rotor 120 can be reduced, and thus it can be ensured that the generator 100 can operate smoothly and efficiently.

[0094] In one example, as Figure 4 shown, the number of finned rotor laminations 300 in the two sets of finned rotor laminations 300a and 300b is equal, and the inner diameters ID2 and ID3 of each finned rotor lamination 300 in the two sets of finned rotor laminations 300a and 300b are equal.

[0095] For example, the space between the multiple directly-connected rotor laminations 200 and the housing of the generator 100 on the left and right sides along the axial direction of the generator 100 is sufficient, so that the number of the two sets of finned rotor laminations 300a and 300b that can be accommodated between the left and right sides of the multiple directly-connected rotor laminations 200 and the housing of the generator 100 can be kept the same. Therefore, by setting the inner diameters of the two sets of finned rotor laminations 300a and 300b to be the same, the unbalance of the rotor core 121 of the motor rotor 120 can be reduced, and thus it can be ensured that the generator 100 can operate smoothly and efficiently.

[0096] It should be understood that Figure 4 、 Figures 11 to 13 the number of finned rotor laminations 300 in the two sets of finned rotor laminations 300a and 300b shown in Figure 4 、 Figures 11 to 13 is two for each. The number of finned rotor laminations 300 included in the two sets of finned rotor laminations 300a and 300b shown in

[0097] Figure 12 Another schematic diagram of the rotor core provided by the embodiment of the present application. In one example, as Figure 12 shown, the number of finned rotor laminations 300 of the two groups of finned rotor laminations 300a and 300b is equal, and the cross-sectional area of each magnet through-hole 12132 of each finned rotor lamination 300 in the two groups of finned rotor laminations 300a and 300b is equal. By setting the cross-sectional areas of the magnet through-holes 12132 of the two groups of finned rotor laminations 300a and 300b on the left and right sides of multiple direct-connected rotor laminations 200 to be the same, the unbalance amount of the rotor core 121 of the motor rotor 120 can be reduced, thereby ensuring that the generator 100 can operate smoothly and efficiently.

[0098] Figure 13 Another schematic diagram of the generator provided by the embodiment of the present application. In one example, as Figure 13 shown, the number of finned rotor laminations 300 of the two groups of finned rotor laminations 300a and 300b is equal, and the inner diameter ID4 of the end plate 140 is equal to the inner diameter ID5 of the end plate 150. By setting the inner diameters of the two end plates 140 and 150 on the left and right sides of the two groups of finned rotor laminations 300 to be the same, the unbalance amount of the motor rotor 120 can be reduced, thereby ensuring that the generator 100 can operate smoothly and efficiently.

[0099] Figure 14 Another schematic diagram of the rotor core provided by the embodiment of the present application. In one embodiment, as Figure 14 shown, multiple finned rotor laminations 300 of the rotor core 121 are fixed on the same side of multiple direct-connected rotor laminations 200 along the axial direction of the generator 100. Multiple direct-connected rotor laminations 200 are arranged in sequence along the axial direction of the generator 100 to form a direct-connected rotor core 1211, multiple finned rotor laminations 300 are arranged in sequence along the axial direction of the generator 100 to form a finned rotor core 1212, and the direct-connected rotor core 1211 and the finned rotor core 1212 are arranged adjacent to each other along the axial direction of the generator 100.

[0100] In one embodiment, the dynamic unbalance amount of the motor rotor 120 can be adjusted by at least one of the following: the intervals between multiple direct-connected rotor laminations 200 and multiple finned rotor laminations 300 and the corresponding two sections of the motor shaft 130, namely the shaft 131 and the shaft 134, the sizes of the magnet through-holes 12131 of multiple direct-connected rotor laminations 200 and the magnet through-holes 12132 of multiple finned rotor laminations 300, and the sizes of the inner diameters of the two end plates 140 and 150.

[0101] Figure 15Another schematic diagram of the generator provided by the embodiment of the present application. In one example, the shaft diameter D1 of a section of the shaft 131 of the motor shaft 130 is smaller than the shaft diameter D4 of another section of the shaft 134 of the motor shaft 130. Since the inner diameter ID2 of the finned rotor punching 300 is larger than the inner diameter ID1 of the directly connected rotor punching 200, compared with the shaft diameter D4 of the other section of the shaft 134 where the motor shaft 130 extends into multiple directly connected rotor punchings 200, setting the shaft diameter D1 of the section of the shaft 131 where the motor shaft 130 extends into multiple finned rotor punchings 300 to be larger can reduce the unbalance of the motor rotor 120, thereby ensuring that the generator 100 can operate smoothly and efficiently.

[0102] Figure 16 Another schematic diagram of the rotor core provided by the embodiment of the present application. In one example, as Figure 16 shown, the cross-sectional area of each magnet through-hole 12131 of each directly connected rotor punching 200 is larger than the cross-sectional area of each magnet through-hole 12132 of each finned rotor punching 300. Compared with the magnet through-hole 12131 of the directly connected rotor punching 200, setting the magnet through-holes 12132 of multiple finned rotor punchings 300 to be smaller can reduce the unbalance of the motor rotor 120, thereby ensuring that the generator 100 can operate smoothly and efficiently.

[0103] Figure 17 Another schematic diagram of the generator provided by the embodiment of the present application. In one embodiment, the generator 100 further includes two end plates 140 and 150. One of the two end plates 140 and 150, i.e., the end plate 140, is distributed on the side of multiple directly connected rotor punchings 200 away from multiple finned rotor punchings 300, and the other end plate 150 is distributed on the side of multiple finned rotor punchings 300 away from multiple directly connected rotor punchings 200. In one example, the inner diameter ID4 of the end plate 140 is smaller than the inner diameter ID5 of the end plate 150. Compared with the end plate 140 adjacent to multiple directly connected rotor punchings 200, setting the inner diameter of the end plate 150 adjacent to multiple finned rotor punchings 300 to be larger can reduce the unbalance of the motor rotor 120, thereby ensuring that the generator 100 can operate smoothly and efficiently.

[0104] In one embodiment, multiple finned rotor punchings 300 and multiple directly connected rotor punchings 200 of the generator 100 can be fixed by fixing means such as fixing parts, welding or bonding. Among them, the fixing parts include bolts, screws, rivets, etc.

[0105] The following describes in detail the method of fixing multiple finned rotor punchings 300 and multiple directly connected rotor punchings 200 of the generator 100 by fixing parts.

[0106] Refer to Figure 6As shown, the finned rotor punching sheet 300 includes a plurality of through holes T2. The plurality of through holes T2 of the finned rotor punching sheet 300 are arranged at intervals along the circumferential direction of the generator 100. Each through hole T2 of the finned rotor punching sheet 300 penetrates the finned rotor punching sheet 300. Refer to Figure 5 As shown, the direct-connected rotor punching sheet 200 includes a plurality of through holes T1. The plurality of through holes T1 of the direct-connected rotor punching sheet 200 are arranged at intervals along the circumferential direction of the generator 100. Each through hole T1 of the direct-connected rotor punching sheet 200 penetrates the direct-connected rotor punching sheet 200.

[0107] Figure 18 And Figure 19 are another schematic diagrams of the generator provided by the embodiments of the present application. As Figure 18 shown, the plurality of through holes T1 of the plurality of direct-connected rotor punching sheets 200 of the direct-connected rotor core 1211 and the plurality of through holes T2 of the plurality of finned rotor punching sheets 300 of each finned rotor core 1212 are axially communicated along the generator 100 to form a plurality of fixing holes T. Each fixing hole T is used to pass through a fixing member 160, and each fixing member 160 is used to fix the plurality of finned rotor punching sheets 300 to the plurality of direct-connected rotor punching sheets 200.

[0108] Figure 20 is another schematic diagram of the direct-connected rotor punching sheet provided by the embodiment of the present application. Figure 21 is another schematic diagram of the finned rotor punching sheet provided by the embodiment of the present application. Figure 22 And Figure 23 are another schematic diagrams of the generator provided by the embodiments of the present application. In one embodiment, as Figure 20 shown, the plurality of through holes T1 of each direct-connected rotor punching sheet 200 are divided into two groups of through holes T11 and T12. The diameter of each through hole T1 of one group of through holes T11 of each direct-connected rotor punching sheet 200 is larger than the diameter of each through hole T1 of the other group of through holes T12. As Figure 21 shown, the plurality of through holes T2 of each finned rotor punching sheet 300 are divided into two groups of through holes T21 and T22. The diameter of each through hole T2 of one group of through holes T21 of each finned rotor punching sheet 300 is larger than the diameter of each through hole T2 of the other group of through holes T22. As Figure 22 And Figure 23 shown, the plurality of through holes T1 of one group of through holes T11 of the plurality of direct-connected rotor punching sheets 200 of the direct-connected rotor core 1211 and the plurality of through holes T2 of one group of through holes T21 of the plurality of finned rotor punching sheets 300 are axially communicated along the generator 100 to form a group of fixing holes Ta, and the plurality of through holes T1 of the other group of through holes T12 of the plurality of direct-connected rotor punching sheets 200 and the plurality of through holes T2 of the other group of through holes T22 of the plurality of finned rotor punching sheets 300 are axially communicated along the generator 100 to form another group of fixing holes Tb.

[0109] In one embodiment, each fixing hole T in two sets of fixing holes Ta and Tb is respectively used to pass through two fixing members, and the diameter of the fixing member passed through by each fixing hole T in one set of fixing holes Ta is larger than that of the fixing member passed through by each fixing hole T in the other set of fixing holes Tb. Thus, compared with the fixing members passed through by each fixing hole T in the other set of fixing holes Tb, the contact areas of the fixing members passed through by each fixing hole T in one set of fixing holes Ta with each direct-connection rotor punching 200 and each finned rotor punching 300 are larger. Furthermore, the torque transmission function between the direct-connection rotor punching 200 and the finned rotor punching 300 can be strengthened through one set of fixing holes Ta of the rotor core 121.

[0110] In one embodiment, as Figure 22 and Figure 23 shown, each fixing hole T in one set of fixing holes Ta is used to pass through a hollow pin 170, and each hollow pin 170 is used to pass through a fixing member 160. Each fixing hole T in the other set of fixing holes Tb is used to pass through a fixing member 160. Thus, during the process of fixing multiple finned rotor punchings 300 to multiple direct-connection rotor punchings 200, first insert the hollow pins 170 into each fixing hole T in one set of fixing holes Ta of the rotor core 121 to achieve concentric positioning of the multiple finned rotor punchings 300 and the multiple direct-connection rotor punchings 200, and then insert each fixing member into each fixing hole T. Furthermore, the assembly cost of the multiple finned rotor punchings 300 and the multiple direct-connection rotor punchings 200 is reduced.

[0111] In one embodiment, as Figure 20 shown, the number of through holes T1 of one set of through holes T11 of each direct-connection rotor punching 200 is less than the number of through holes T1 of the other set of through holes T12. As Figure 21 shown, the number of through holes T2 of one set of through holes T21 of each finned rotor punching 300 is less than the number of through holes T2 of the other set of through holes T22. Thus, concentric positioning of the multiple finned rotor punchings 300 and the multiple direct-connection rotor punchings 200 can be achieved with fewer hollow pins 170, simplifying the assembly process of the multiple finned rotor punchings 300 and the multiple direct-connection rotor punchings 200.

[0112] In one embodiment, in combination with Figure 20 and Figure 21 , the number of through holes T1 of one set of through holes T11 of each direct-connection rotor punching 200 and the number of through holes T2 of one set of through holes T21 of each finned rotor punching 300 are both two. In addition, in combination with Figure 20 and Figure 21, the centers of the two through-holes T1 of a set of through-holes T11 of each direct-connection rotor punching sheet 200 and the center of each direct-connection rotor punching sheet 200 are almost on a straight line, and the centers of the two through-holes T2 of a set of through-holes T21 of each finned rotor punching sheet 300 and the center of each finned rotor punching sheet 300 are almost on a straight line. Thus, through the two hollow pins 170, concentric positioning of multiple finned rotor punching sheets 300 and multiple direct-connection rotor punching sheets 200 can be accurately achieved.

[0113] As described above, the above is only the specific implementation manner of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present application can easily think of changes or substitutions, which should all be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A generator, characterized in that, The generator includes a plurality of direct-connected rotor laminations and a plurality of finned rotor laminations, and the inner diameter of each of the direct-connected rotor laminations is smaller than the inner diameter of each of the finned rotor laminations, wherein: Each of the direct-connected rotor laminations is fixedly sleeved on the motor shaft of the generator; The plurality of finned rotor laminations are divided into two groups and are respectively fixed on both sides of the plurality of direct-connected rotor laminations along the axial direction of the generator, or the plurality of finned rotor laminations are fixed on the same side of the plurality of direct-connected rotor laminations along the axial direction of the generator.

2. The generator according to claim 1, wherein, The shaft diameter of a section of the motor shaft extending into one group of the finned rotor laminations is larger than the shaft diameter of another section of the motor shaft extending into the other group of the finned rotor laminations, and the number of the finned rotor laminations in the one group of finned rotor laminations is less than the number of the finned rotor laminations in the other group of finned rotor laminations.

3. The generator according to claim 1, wherein The number of the finned rotor laminations in the one group of finned rotor laminations is less than the number of the finned rotor laminations in the other group of finned rotor laminations, and the inner diameter of each of the finned rotor laminations in the one group of finned rotor laminations is smaller than the inner diameter of each of the finned rotor laminations in the other group of finned rotor laminations.

4. The generator according to claim 2 or 3, characterized in that, Each of the finned rotor laminations includes a plurality of magnet through-holes, and the plurality of magnet through-holes of each of the finned rotor laminations are arranged at intervals along the circumferential direction of the generator, wherein: The cross-sectional area of each of the magnet through-holes of each of the finned rotor laminations in the one group of finned rotor laminations is smaller than the cross-sectional area of each of the magnet through-holes of each of the finned rotor laminations in the other group of finned rotor laminations.

5. The generator according to any one of claims 2 to 4, characterized in that, One end plate of the generator is distributed on one side of the one group of finned rotor laminations away from the plurality of direct-connected rotor laminations, and the other end plate of the generator is distributed on one side of the other group of finned rotor laminations away from the plurality of direct-connected rotor laminations, and the inner diameter of the one end plate is smaller than the inner diameter of the other end plate.

6. The generator according to claim 1, characterized in that, The shaft diameters of the two sections of the motor shaft extending into the two groups of finned rotor laminations are equal, and the number of the finned rotor laminations in the two groups of finned rotor laminations is equal.

7. The generator according to claim 1, characterized in that, The number of the finned rotor laminations in the two groups of finned rotor laminations is equal, and the inner diameters of each of the finned rotor laminations in the two groups of finned rotor laminations are equal.

8. The generator according to claim 6 or 7, characterized in that, Each of the finned rotor laminations includes a plurality of magnet through-holes, and the plurality of magnet through-holes of each of the finned rotor laminations are arranged at intervals along the circumferential direction of the generator, wherein: The cross-sectional areas of each of the magnet through-holes of each of the finned rotor laminations in the two groups of finned rotor laminations are equal.

9. The generator according to any one of claims 6 to 8, characterized in that, One end plate of the generator is distributed on one side of the one group of finned rotor laminations away from the plurality of direct-connected rotor laminations, and the other end plate of the generator is distributed on one side of the other group of finned rotor laminations away from the plurality of direct-connected rotor laminations, and the inner diameter of the one end plate is equal to the inner diameter of the other end plate.

10. The generator according to claim 1, characterized in that, The shaft diameter of a section of the motor shaft extending into the plurality of finned rotor laminations distributed on the same side of the plurality of direct-connected rotor laminations is larger than the shaft diameter of another section of the motor shaft extending into the plurality of direct-connected rotor laminations.

11. The generator according to claim 10, characterized in that, Each of the direct-connected rotor laminations and each of the finned rotor laminations includes a plurality of magnet through-holes, and the plurality of magnet through-holes of each of the direct-connected rotor laminations and the plurality of magnet through-holes of each of the finned rotor laminations are arranged at intervals along the circumferential direction of the generator, wherein: The cross-sectional area of each magnet through-hole of each direct-connected rotor lamination is larger than the cross-sectional area of each magnet through-hole of each finned rotor lamination.

12. The generator according to claim 10 or 11, characterized in that, One end plate of the generator is distributed on one side of the plurality of direct-connected rotor laminations facing away from the plurality of finned rotor laminations, and the other end plate of the generator is distributed on one side of the plurality of finned rotor laminations facing away from the plurality of direct-connected rotor laminations, and the inner diameter of the one end plate is smaller than the inner diameter of the other end plate.

13. The generator according to any one of claims 1 to 12, characterized in that The inner diameter of each direct-connected rotor lamination is less than or equal to the diameter of a section of the motor shaft extending into the plurality of direct-connected rotor laminations.

14. An extended-range powertrain, characterized in that, The range-extended powertrain includes an engine and a generator as claimed in any one of claims 1 to 13, and the engine is used for drivingly connecting to the generator and for driving the generator to generate electricity.

15. An extended-range electric vehicle, characterized in that, The range-extended electric vehicle includes wheels, a battery pack, and a range-extended powertrain as claimed in claim 14, and the generator is used for supplying power to the battery pack or a drive motor of the range-extended powertrain.

Images