Rotating shaft, rotor assembly, motor and vehicle

Abstract

The utility model relates to a rotating shaft, a rotor assembly, a motor and a vehicle, and relates to the technical field of automobiles. The rotating shaft comprises a shaft body, a first end plate and a sensing rotor; the first end plate is fixed on the shaft body; the sensing rotor is fixed on the shaft body; the sensing rotor and the first end plate are integrally formed with the shaft body. According to the motor, the sensing rotor and the first end plate are integrally formed with the shaft body, so that the shaft body, the sensing rotor and the first end plate are integrated, the number and types of parts of the motor can be reduced, the assembly steps of the motor can be simplified, and the production efficiency of the motor is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of automobiles, in particular to a rotating shaft, a rotor assembly, an electric machine and a vehicle. BACKGROUND

[0002] The electric machine, which is a general term for electric motor and generator, is an electromagnetic device that converts electrical energy into mechanical energy or vice versa according to the laws of electromagnetic induction and electromagnetic force. The electric machine includes many components, such as a housing, a stator assembly fixed in the housing, a rotor assembly rotatably arranged in the housing, and a position sensor for collecting position information of the rotor assembly. The rotor assembly includes a rotating shaft, a rotor core sleeved on the rotating shaft, and two end plates for fixing the rotor core on the rotating shaft. The sensing rotor is fixed on the rotating shaft to rotate synchronously with the rotating shaft. The two end plates are respectively located at the two ends of the rotor core to limit the movement of the rotor core along the axial direction of the rotating shaft.

[0003] Due to the large number of components of the electric machine, the assembly steps of the electric machine are relatively large, thereby reducing the production efficiency of the electric machine. CONTENT OF THE INVENTION

[0004] The embodiment of the present application provides a rotating shaft, which can reduce the number of components of the electric machine, thereby reducing the assembly steps of the electric machine, and improving the production efficiency of the electric machine to at least solve the above technical problems.

[0005] In order to achieve the above-mentioned purpose, according to the first aspect of the present application, a rotating shaft is provided, which comprises a shaft body, a first end plate and a sensing rotor; the first end plate is fixed on the shaft body; the sensing rotor is fixed on the shaft body; wherein the sensing rotor and the first end plate are integrally formed with the shaft body.

[0006] Optionally, the two ends of the shaft body are respectively a first end and a second end, the first end plate and the sensing rotor are arranged close to the first end, and the sensing rotor is located on the side of the first end plate away from the second end.

[0007] Optionally, the opposite surfaces of the first end plate and the sensing rotor are connected to each other.

[0008] Optionally, the surface of the first end plate facing the sensing rotor is provided with an end ring, the end ring extends around the axis of the shaft body, and the end ring is sleeved on the sensing rotor.

[0009] Optionally, the outer peripheral surface of the sensing terminal is connected to the inner peripheral surface of the end ring.

[0010] Optionally, the radial edge and the circumferential edge of the sensing rotor intersect to form a corner, an auxiliary groove is arranged at the part of the inner peripheral surface of the end ring close to the corner, and the radial edge of the sensing terminal smoothly transitions to the inner wall of the auxiliary groove.

[0011] Optionally, the first end plate and the sensing rotor are arranged in the axial direction of the shaft body.

[0012] Optionally, the rotating shaft further comprises a second end plate, the first end plate and the second end plate are respectively located at two ends of the shaft body, and the second end plate is integrally formed with the shaft body; wherein the sensing rotor is located on a side of the first end plate away from the second end plate, or the sensing rotor is located on a side of the second end plate away from the second end plate.

[0013] Optionally, the first end plate extends in a ring shape around the axis of the shaft body.

[0014] According to a second aspect of the present application, a rotor assembly is provided, which comprises a rotor core and the aforementioned rotating shaft; the rotor core is sleeved on the shaft body, one end of the rotor core abuts against the first end plate, and the sensing rotor is located on a side of the first end plate away from the rotor core or on a side of the rotor core away from the first end plate.

[0015] According to a third aspect of the present application, an electric machine is provided, which comprises a housing, a stator assembly, a sensing stator and the aforementioned rotor assembly; the rotor assembly is arranged in the housing, the shaft body is rotationally coupled with the housing; the stator assembly is arranged in the housing and sleeved on the rotor assembly; and the sensing stator is located on a side of the sensing rotor away from the rotor core.

[0016] According to a fourth aspect of the present application, a vehicle is provided, which comprises the aforementioned electric machine.

[0017] In the rotating shaft of the embodiments of the present application, the sensing rotor and the first end plate are both integrally formed with the shaft body, so that the shaft body, the sensing rotor and the first end plate are integrated, which can reduce the number and types of components of the electric machine, thereby simplifying the assembly steps of the electric machine and improving the production efficiency of the electric machine.

[0018] Other features and advantages of the present application will be described in detail in the following specific embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiment description. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without any creative effort on the basis of these drawings.

[0020] In order to more completely understand the present application and its beneficial effects, the following will be described in conjunction with the drawings, wherein the same reference numerals in the following description represent the same parts.

[0021] Figure 1 is a structural schematic view of a first rotating shaft provided in an exemplary embodiment of the present disclosure;

[0022] Figure 2 is a longitudinal sectional structure schematic view of a first rotating shaft provided in the exemplary embodiment of the present disclosure;

[0023] Figure 3 is a structure schematic view of a second rotating shaft provided in the exemplary embodiment of the present disclosure;

[0024] Figure 4 is a structure schematic view of a third rotating shaft provided in the exemplary embodiment of the present disclosure; Figure 3 is a sectional view of A-A in FIG. 1;

[0025] Figure 5 is a sectional view of B in FIG. 1; Figure 3 is an enlarged view of B in FIG. 1;

[0026] Figure 6 is a longitudinal sectional structure schematic view of a fourth rotating shaft provided in the exemplary embodiment of the present disclosure;

[0027] Figure 7 is a structure schematic view of a rotor assembly provided in the exemplary embodiment of the present disclosure;

[0028] Figure 8 is a structure schematic view of a motor provided in the exemplary embodiment of the present disclosure;

[0029] Figure 9 is a partial structure schematic view of a motor provided in the exemplary embodiment of the present disclosure;

[0030] Figure 10 is a position schematic view of a sensing rotor and a sensing stator provided in the exemplary embodiment of the present disclosure.

[0031] Explanation of Reference Signs:

[0032] 1-rotating shaft; 11-first end; 12-second end; 13-shaft body; 14-first end plate; 15-sensing rotor; 151-vane; 152-corner; 16-end ring; 161-assistant groove; 162-cutting groove; 17-second end plate;

[0033] 2-rotor assembly; 21-rotor core; 3-motor; 31-housing; 32-stator assembly; 33-sensing stator. DETAILED DESCRIPTION

[0034] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the present application.

[0035] Before introducing the shaft 1, the rotor assembly 2, the motor 3 and the vehicle provided by the embodiments of the present application, the related technologies of the present application are introduced.

[0036] In the related technologies, the motor 3 comprises a housing 31, a stator assembly 32 fixed in the housing 31, a rotor assembly 2 rotatably arranged in the housing 31 and a position sensor for collecting position information of the rotor assembly 2. The rotor assembly 2 comprises a shaft 1, a rotor core 21 sleeved on the shaft 1 and two end plates for fixing the rotor core 21 on the shaft 1. The two end plates are respectively arranged at two ends of the rotor core 21 to limit the movement of the rotor core 21 along the axial direction of the shaft 1. The position sensor is an eddy current sensor, which comprises a sensing rotor 15 fixed on the shaft 1 and a sensing stator 33 fixed relative to the housing 31. The sensing rotor 15 comprises a plurality of blades 151 arranged at intervals in the circumferential direction of the shaft 1. The sensing stator 33 mainly comprises an excitation winding and a signal winding. When the eddy current sensor works, the excitation winding generates an excitation magnetic field through a high-frequency alternating current signal. The excitation magnetic field generates an eddy current on the rotor. The eddy current generates a stimulating magnetic field. The size of the eddy current generated by the sensing rotor 15 is positively correlated with the radius of the eddy current. That is, the eddy current generated by the outer periphery of the sensing rotor 15 is the largest, and the closer to the axis of the shaft 1, the smaller the eddy current generated by the sensing rotor 15. The signal winding is used to receive the signal generated by the eddy current. Usually, each signal winding is composed of two series-connected sub-windings, one of which is wound in the clockwise direction and the other is wound in the counterclockwise direction. Therefore, the voltages generated by the two sub-windings of each signal winding are in opposite directions. The sensing rotor 15 comprises a plurality of blades 151 arranged at intervals in the circumferential direction, the blades 151 rotate with the shaft 1 and generate a periodically changing stimulating magnetic field to the signal winding, so that the signal winding receives a periodically changing signal. For example, when the blade 151 of the sensing rotor 15 is aligned with the radially outward protruding part of the signal winding, the maximum positive voltage signal is generated. When the blade 151 is aligned with the radially inward protruding part of the signal winding, the maximum negative voltage signal is generated. When the interval between the blades 151 is aligned with the protruding part of the signal winding, the voltage signal is 0. In this way, when the sensing rotor 15 rotates with the shaft 1, a periodically changing voltage signal, usually a periodically alternating sinusoidal voltage signal, can be generated. When the motor 3 has N pole pairs, there are N blades 151. Correspondingly, when the sensing rotor 15 rotates one revolution, N periodic signals are generated. In order to avoid the influence of signal strength on angle acquisition and improve signal accuracy, usually N signal windings are also provided for signal acquisition.

[0037] However, the sensing rotor 15, the end plate and the shaft 1 are discrete parts, resulting in a large number of components of the motor 3. In addition, during assembly, the sensing rotor 15 and the end plate need to be fixed on the shaft 1. Therefore, the motor 3 has more assembly steps, which leads to a low production efficiency of the motor 3.

[0038] Based on this, the embodiment of the present application provides a rotating shaft 1, a rotor assembly 2, a motor 3 and a vehicle to reduce the number of parts of the motor 3 and simplify the assembly steps of the motor 3, so as to improve the production efficiency of the motor 3.

[0039] The following will be described in detail Figures 1 to 10 The rotating shaft 1, the rotor assembly 2, the motor 3 and the vehicle provided by the present application will be described in detail.

[0040] Please refer to Figure 1 Or Figure 3 Or Figure 6 , Figure 1 is a structural schematic diagram of a first rotating shaft 1 provided in an exemplary embodiment of the present disclosure, Figure 3 is a structural schematic diagram of a second rotating shaft 1 provided in an exemplary embodiment of the present disclosure, Figure 6 is a longitudinal sectional structural schematic diagram of a third rotating shaft 1 provided in an exemplary embodiment of the present disclosure. In a first aspect, the embodiment of the present application provides a rotating shaft 1. The rotating shaft 1 comprises a shaft body 13, a first end plate 14 and a sensing rotor 15. The first end plate 14 is fixed on the shaft body 13. The sensing rotor 15 is fixed on the shaft body 13. Wherein, the sensing rotor 15 and the first end plate 14 are integrally formed with the shaft body 13.

[0041] It can be understood that the sensing rotor 15 and the first end plate 14 can be arranged at the same end of the shaft body 13. In this way, when the rotor core 21 is installed on the shaft body 13, the rotor core 21 can be directly sleeved on the shaft body 13. Then the second end plate 17 is installed on the side of the shaft body 13 away from the first end plate 14, so as to fix the rotor core 21 on the shaft body 13 through the first end plate 14 and the second end plate 17.

[0042] It can be understood that the sensing rotor 15 and the first end plate 14 can be arranged at the two ends of the shaft body 13 respectively, and the position between the sensing rotor 15 and the first end plate 14 is used to install the rotor core 21. In this way, the rotor core 21 is a segmented core structure. When the rotor core 21 is installed on the shaft body 13, each part of the rotor core 21 is installed between the sensing rotor 15 and the first end plate 14 in turn, and each part of the rotor core 21 is fastened to be integrated. Then the second end plate 17 is installed on the side of the shaft body 13 away from the first end plate 14, so as to fix the rotor core 21 on the shaft body 13 through the first end plate 14 and the second end plate 17.

[0043] It can be understood that the integrally formed sensing rotor 15 and the first end plate 14 with the shaft body 13 can be formed by cutting.

[0044] It can be understood that the sensing rotor 15 comprises a plate body extending annularly around the axis of the shaft body 13; a plurality of notches are provided on the plate body to form a plurality of blades 151 on the plate body.

[0045] In the embodiment, by integrally forming the sensing rotor 15 and the first end plate 14 with the shaft body 13, the shaft body 13, the sensing rotor 15 and the first end plate 14 are integrated, which can reduce the number and types of components of the motor 3, thereby simplifying the assembly steps of the motor 3 and improving the production efficiency of the motor 3.

[0046] In addition, by integrally forming the sensing rotor 15 and the first end plate 14 with the shaft body 13, the component assembly error during assembly of the motor 3 can be reduced, thereby improving the manufacturing precision of the motor 3 and facilitating the assembly quality of the motor 3.

[0047] Please refer to Figure 1 In some embodiments, the two ends of the shaft body 13 are respectively the first end 11 and the second end 12. The first end plate 14 and the sensing rotor 15 are arranged close to the first end 11. The sensing rotor 15 is located on the side of the first end plate 14 away from the second end 12. In this way, the rotor core 21 can be sleeved on the shaft body 13 from the second end 12, thereby facilitating the installation efficiency of the rotor core 21.

[0048] Please refer to Figure 2 , Figure 2 is a schematic view of a longitudinal cross-section structure of a first rotating shaft 1 provided in an exemplary embodiment of the present disclosure. In some embodiments, the opposite surfaces of the first end plate 14 and the sensing rotor 15 are connected to each other. In this way, the first end plate 14 and the sensing rotor 15 are combined into one, thereby improving the structural strength of the first end plate 14 and the sensing rotor 15, and improving the compactness between the first end plate 14 and the sensing rotor 15, thereby reducing the space occupied by the first end plate 14 and the sensing rotor 15 in the axial direction of the shaft body 13. In this way, the axial dimension of the rotating shaft 1 can be reduced, thereby facilitating the reduction of the volume of the motor 3 and improving the power density of the motor 3.

[0049] Please refer to Figure 3 In some embodiments, the surface of the first end plate 14 facing the sensing rotor 15 is provided with an end ring 16. The end ring 16 extends around the axis of the shaft body 13. The end ring 16 is sleeved on the sensing rotor 15.

[0050] It can be understood that the sensing terminal can be located in the inner ring of the end ring 16, or the sensing terminal can be located in the inner ring of the end ring 16 as a whole.

[0051] It can be understood that the end plate is internally provided with an oil channel. In order to improve the dynamic balance of the rotating shaft 1, a balance hole is arranged at a position close to the outer periphery of the end plate. In order to avoid the balance hole penetrating the oil channel and causing oil leakage, the outer periphery of the end plate needs to be thickened to ensure the structural integrity of the oil channel.

[0052] Based on this, in the embodiment, the end ring 16 is arranged and sleeved on the sensing rotor 15. On the one hand, the end ring 16 and the sensing rotor 15 share a part of the axial space, so as to reduce the space occupied by the end ring 16 and the sensing rotor 15 in the axial direction of the shaft body 13, facilitate the reduction of the axial size of the rotating shaft 1, and further reduce the volume of the motor 3 and improve the power density of the motor 3. On the other hand, the outer periphery of the first end plate 14 is thickened to facilitate the layout of the oil channel and the balance hole, which can not only facilitate the improvement of the dynamic balance of the rotating shaft 1 by arranging the balance hole, but also ensure the structural integrity of the oil channel and avoid oil leakage.

[0053] Please refer to Figure 4 , Figure 4 is Figure 3 A-A sectional view in some embodiments. The outer periphery of the sensing terminal is connected with the inner periphery of the end ring 16. In this way, the bonding surface between the sensing terminal and the first end plate 14 can be increased, so as to improve the reliability of the bonding between the sensing terminal and the first end plate 14 and facilitate the improvement of the structural strength of the rotating shaft 1.

[0054] Please refer to Figure 5 , Figure 5 is Figure 3 the enlarged view of B in some embodiments. The radial edge and the circumferential edge of the sensing rotor 15 intersect to form a corner 152. The inner periphery of the end ring 16 is provided with an auxiliary groove 161 close to the corner 152. The radial edge of the sensing terminal smoothly transitions to the inner wall of the auxiliary groove 161.

[0055] It can be understood that after the sensing rotor 15 and the first end plate 14 are combined into one, a plurality of cutting grooves 162 are formed on the plate for forming the sensing rotor 15, the first end plate 14 and the end ring 16 by cutting processing, so as to form a plurality of blades 151 arranged along the circumferential direction of the rotating shaft 1. The corner 152 close to the outer periphery has a small angle, and the cutting tool cannot directly process the corner 152. Therefore, in order to facilitate the formation of the cutting groove 162, the auxiliary groove 161 is processed at the position where the corner 152 has a small angle, so as to facilitate the tool path.

[0056] In addition, by arranging the auxiliary groove 161, the effective radial length of the radial edge of the blade 151 can be ensured, which is beneficial to the magnetic field cutting and ensures the current amplitude.

[0057] Please refer to Figure 6In some embodiments, the first end plate 14 and the sensing rotor 15 are circumferentially spaced along the shaft body 13. In this way, the surface area of the first end plate 14 and the sensing rotor 15 can be increased, so that the heat dissipation area of the first end plate 14 and the sensing rotor 15 can be increased, thereby improving the heat dissipation efficiency of the shaft 1.

[0058] Referring to Figure 7 , Figure 7 is a longitudinal sectional view of a fourth shaft 1 according to an exemplary embodiment of the present disclosure. In some embodiments, the shaft 1 further comprises a second end plate 17. The first end plate 14 and the second end plate 17 are respectively located at the two ends of the shaft body 13. The second end plate 17 is integrally formed with the shaft body 13. The sensing rotor 15 is located on the side of the first end plate 14 away from the second end plate 17, or the sensing rotor 15 is located on the side of the second end plate 17 away from the second end plate 17. In this way, the reliability of the connection between the second end plate 17 and the shaft body 13 can be improved, and the second end plate 17 can be prevented from being separated from the shaft body 13.

[0059] Referring to Figure 1 or Figure 3 In some embodiments, the first end plate 14 extends around the axis of the shaft body 13 to form a ring shape. In this way, the axial symmetry of the shaft 1 can be improved, thereby improving the dynamic balance of the shaft 1.

[0060] Referring to Figure 8 , Figure 8 is a structure diagram of a rotor assembly 2 according to an exemplary embodiment of the present disclosure. In a second aspect, the present application provides a rotor assembly 2. The rotor assembly 2 comprises a rotor core 21 and the aforementioned shaft 1. The rotor core 21 is sleeved on the shaft body 13. One end of the rotor core 21 abuts against the first end plate 14. The sensing rotor 15 is located on the side of the first end plate 14 away from the rotor core 21, or the sensing rotor 15 is located on the side of the rotor core 21 away from the first end plate 14.

[0061] It can be understood that the rotor assembly 2 further comprises a rotor winding. The rotor winding is wound around the rotor core 21.

[0062] It can be understood that the rotor assembly 2 comprises the aforementioned shaft 1, and the rotor assembly 2 has all the beneficial effects of the aforementioned shaft 1, which will not be repeated herein.

[0063] Referring to Figure 9 and Figure 10 , Figure 9 is a partial structure diagram of an electric machine 3 according to an exemplary embodiment of the present disclosure, Figure 10is a position schematic view of the sensing rotor 15 and the sensing stator 33 provided in the example embodiment of the present disclosure. In a third aspect, the application also provides an electric machine 3. The electric machine 3 comprises a housing 31, a stator assembly 32, the sensing stator 33, and the aforementioned rotor assembly 2. The rotor assembly 2 is arranged in the housing 31. The shaft body 13 is rotatably coupled with the housing 31. The stator assembly 32 is arranged in the housing 31 and is sleeved on the rotor assembly 2. The sensing stator 33 is located on the side of the sensing rotor 15 away from the rotor core 21.

[0064] It can be understood that the shaft body 13 is rotatably coupled with the housing 31 through the bearing. The sensing stator 33 is fixed on the housing 31.

[0065] It can be understood that the electric machine 3 comprises the aforementioned rotor assembly 2, and the electric machine 3 has all the beneficial effects of the aforementioned rotor assembly 2, which will not be repeated here.

[0066] In a fourth aspect, the application also provides a vehicle comprising the aforementioned electric machine 3.

[0067] It can be understood that the vehicle can be a fuel automobile, a range-extended automobile, a plug-in hybrid electric vehicle, or a new energy vehicle, etc., which will not be specifically limited in the present disclosure.

[0068] It can be understood that the vehicle comprises the aforementioned electric machine 3, and the vehicle has all the beneficial effects of the aforementioned electric machine 3, which will not be repeated here.

[0069] In the description of the present application, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first", "second" can explicitly or implicitly include one or more features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise specifically limited.

[0070] In the above embodiments, the description of each embodiment has its own emphasis, and the parts not described in detail in a certain embodiment can be referred to the related description of other embodiments.

[0071] The embodiments, implementation manners and related technical features of the present application can be combined, replaced or modified without conflict.

[0072] The above is only the preferred embodiment of the present application, and does not limit the present application in any form. Any simple modification, equivalent change and modification made to the above embodiment according to the technical essence of the present application, without departing from the technical solution of the present application, still falls within the scope of the technical solution of the present application.

Claims

1. A rotating shaft (1), characterized in that, The shaft (13) comprises: a first end plate (14) fixed to the shaft (13); and a sensing rotor (15) fixed to the shaft (13). The sensing rotor (15) and the first end plate (14) are integrally formed with the shaft (13). The shaft (13) has a first end (11) and a second end (12), the first end plate (14) and the sensing rotor (15) are arranged close to the first end (11), and the sensing rotor (15) is located on a side of the first end plate (14) away from the second end (12). The opposite surfaces of the first end plate (14) and the sensing rotor (15) are connected to each other.

2. A pivot (1) according to claim 1, characterized in that The surface of the first end plate (14) facing the sensing rotor (15) is provided with an end ring (16) extending around the axis of the shaft (13), and the end ring (16) is sleeved on the sensing rotor (15).

3. A pivot (1) according to claim 2, characterized in that The outer circumferential surface of the sensing terminal is connected to the inner circumferential surface of the end ring (16).

4. A pivot (1) according to claim 3, characterized in that The radial edge and the circumferential edge of the sensing rotor (15) intersect to form a corner (152), and an auxiliary groove (161) is arranged on the inner circumferential surface of the end ring (16) close to the corner (152), and the radial edge of the sensing terminal smoothly transitions to the inner wall of the auxiliary groove (161).

5. A pivot (1) according to claim 4, characterized in that The first end plate (14) and the sensing rotor (15) are arranged in the axial direction of the shaft (13).

6. A pivot (1) according to claim 5, characterized in that The shaft (1) further comprises a second end plate (17), the first end plate (14) and the second end plate (17) are arranged at the two ends of the shaft (13), and the second end plate (17) is integrally formed with the shaft (13).

7. A pivot (1) according to claim 2, characterized in that The sensing rotor (15) is located on a side of the first end plate (14) away from the second end plate (17).

8. A pivot (1) according to any one of claims 1-7, characterized in that The first end plate (14) extends around the axis of the shaft (13) to form a ring shape. The shaft (1) according to any one of claims 1-9 comprises:

9. A pivot (1) according to any one of claims 1-7, characterized in that a rotor core (21) sleeved on the shaft (13), one end of the rotor core (21) abuts against the first end plate (14), and the sensing rotor (15) is located on a side of the first end plate (14) away from the rotor core (21).

10. A rotor assembly (2) characterized by, The shaft (1) according to any one of claims 1-9 comprises: a housing (31); the rotor assembly (2) according to claim 10 is arranged in the housing (31), the shaft (13) is rotationally connected with the housing (31); a stator assembly (32) arranged in the housing (31) and sleeved on the rotor assembly (2); and 11. An electric machine (3) characterized by a sensing stator (33) located on a side of the sensing rotor (15) away from the rotor core (21). The motor (3) according to claim 11. ​ ​ ​ 12. A vehicle characterized by comprising: ​

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