Electric machine and vehicle having the same

Abstract

The application provides a motor and a vehicle with the same, comprising a rotating shaft, a bearing and a Hall sensor, the bearing comprising an inner ring, an outer ring and rolling elements, the rolling elements being arranged between the inner ring and the outer ring, the inner ring being fixed on the rotating shaft in a sleeving mode, wherein the inner ring is a magnetic body, and / or the rotating shaft comprises a magnetic segment, the Hall sensor is used for cooperating with the magnetic body or the magnetic segment to detect the rotating speed of the rotating shaft. According to the motor provided by the application, the rotating speed of the motor can be calculated through the cooperation of the magnetic body or the magnetic segment and the Hall sensor, so that the accuracy of the movement of the motor driving part can be ensured, meanwhile, the use of parts can be reduced, the production cost can be effectively reduced, and the volume of the motor can be reduced.

Description

Technical Field

[0001] This invention relates to the field of vehicle manufacturing technology, and in particular to an electric motor and a vehicle having the same. Background Technology

[0002] In existing vehicle motor solutions, magnetic rings and Hall sensors are commonly installed on the motor to identify its speed. The magnetic ring and Hall sensor work together to detect the motor speed and shaft position. However, this type of motor has a complex structure and many parts, which cannot effectively reduce production costs. Summary of the Invention

[0003] The present invention aims to at least solve one of the technical problems existing in the prior art. To this end, the present invention provides an electric motor that can effectively reduce production costs.

[0004] This application also proposes a vehicle having the aforementioned motor.

[0005] According to an embodiment of the present invention, a motor includes: a rotating shaft, a bearing, and a Hall sensor. The bearing includes: an inner ring, an outer ring, and rolling elements. The rolling elements are disposed between the inner ring and the outer ring. The inner ring is sleeved and fixed on the rotating shaft. The inner ring is a magnetic material, and / or the rotating shaft includes a magnetic segment. The Hall sensor is used to cooperate with the magnetic material or the magnetic segment to detect the rotational speed of the rotating shaft.

[0006] According to the present invention, by setting a magnetic body or magnetic segment, and the magnetic body or magnetic segment cooperating with a Hall sensor, the rotational speed of the motor can be calculated, thereby ensuring the accuracy of the movement of the motor drive components. At the same time, it can reduce the use of parts, effectively reduce production costs, and also reduce the size of the motor.

[0007] According to some embodiments of the present invention, at least one of the magnetic body and the magnetic segment includes a magnetic ring, the magnetic ring including a first magnetic pole region and a second magnetic pole region, the first magnetic pole region and the second magnetic pole region being arranged alternately along the circumference of the magnetic ring, the first magnetic pole region and the second magnetic pole region being equal in number and having opposite magnetic properties.

[0008] According to some optional embodiments of the present invention, the number of magnetic rings is at least one. When the number of magnetic rings is multiple, the multiple magnetic rings are arranged sequentially along the radial direction of the inner ring. In two adjacent magnetic rings in the radial direction of the inner ring, the first magnetic pole region of one magnetic ring corresponds one-to-one with the second magnetic pole region of the other magnetic ring and is directly opposite to it in the radial direction of the inner ring.

[0009] According to some embodiments of the present invention, a portion of the rotating shaft is formed as the magnetic segment, and the magnetic segment is disposed close to the Hall sensor, or the entire rotating shaft is formed as the magnetic segment.

[0010] According to some embodiments of the present invention, the radially outer surface of the inner ring is provided with a first groove recessed radially inward along the inner ring, and the radially inner surface of the outer ring is provided with a second groove recessed radially outward along the outer ring, and the rolling element is fitted into the first groove and the second groove.

[0011] According to some embodiments of the present invention, the inner ring is a magnetic body, and the rolling element is a magnetic attractant and is configured to magnetically attract the inner ring.

[0012] According to some embodiments of the present invention, the Hall sensor includes: a Hall element; a fixing plate having a through hole, the rotating shaft being rotatably inserted through the through hole, and the Hall element being fixed to the fixing plate.

[0013] According to some alternative embodiments of the present invention, the inner ring is a magnetic material, and the Hall element and the inner ring are arranged opposite each other in the axial direction of the rotating shaft.

[0014] According to some embodiments of the present invention, the device includes: a housing; a rotor located inside the housing and fixedly mounted on a rotating shaft, the rotor and the bearing being arranged at an axial distance along the rotating shaft; and a stator fixed to the inner wall of the housing and mounted radially outside the rotor.

[0015] A vehicle according to a second aspect of the present invention includes a motor according to a first aspect of the present invention.

[0016] According to the vehicle of the present invention, by providing a motor in the first aspect embodiment described above, and by providing a magnetic body or magnetic segment, which cooperates with a Hall sensor, the rotational speed of the motor can be calculated, thereby ensuring the accuracy of the movement of the motor drive components. At the same time, the use of parts can be reduced, production costs can be effectively reduced, and the size of the motor can be reduced.

[0017] According to some embodiments of the present invention, the vehicle includes a reduction mechanism connected to the shaft of the motor.

[0018] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of a motor according to an embodiment of the present invention;

[0020] Figure 2 yes Figure 1 A schematic diagram of part of the structure of the motor shown;

[0021] Figure 3 yes Figure 1 A schematic diagram of part of the structure of the motor shown;

[0022] Figure 4 yes Figure 3 A schematic diagram of the bearing shown;

[0023] Figure 5 yes Figure 4 A schematic diagram of the inner circle shown;

[0024] Figure 6 yes Figure 5 A schematic diagram of the first embodiment of the inner ring magnetic ring shown;

[0025] Figure 7 yes Figure 5 A schematic diagram of the second embodiment of the inner ring magnetic ring shown;

[0026] Figure 8 yes Figure 5 A schematic diagram of the third embodiment of the inner ring magnetic ring shown;

[0027] Figure 9 yes Figure 5 A schematic diagram of the fourth embodiment of the inner ring magnetic ring shown;

[0028] Figure 10 yes Figure 5 A schematic diagram of the fifth embodiment of the inner ring magnetic ring shown;

[0029] Figure 11 yes Figure 5 A schematic diagram of the outer ring shown;

[0030] Figure 12 yes Figure 1 The diagram shows a Hall sensor.

[0031] Figure label:

[0032] 100. Electric motor;

[0033] 10. Shaft;

[0034] 20. Bearing; 21. Inner ring; 211. Magnetic ring; 2111. First magnetic pole region; 2112. Second magnetic pole region; 212. First groove; 22. Outer ring; 221. Second groove; 23. Rolling element;

[0035] 30. Hall sensor; 31. Hall element; 32. Mounting plate; 321. Through hole;

[0036] 40. Housing;

[0037] 50. Rotor;

[0038] 60. Stator;

[0039] 71. Bearing clip; 72. Oil-impregnated bearing; 73. Wear-resistant gasket; 74. Rubber pad; 75. Commutator; 76. Winding. Detailed Implementation

[0040] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0041] The following is a reference appendix. Figure 1-12 A motor 100 according to an embodiment of the present invention is described.

[0042] Reference Figure 1 , Figure 4 , Figure 5 , Figure 11 and Figure 12 According to an embodiment of the present invention, the motor 100 includes: a rotating shaft 10, a bearing 20, and a Hall sensor 30.

[0043] Specifically, the bearing 20 includes an inner ring 21, an outer ring 22, and a rolling element 23. The rolling element 23 is disposed between the inner ring 21 and the outer ring 22. The inner ring 21 is sleeved and fixed on the rotating shaft 10. The inner ring 21 is a magnetic body, and / or the rotating shaft 10 includes a magnetic segment. The Hall sensor 30 is used to cooperate with the magnetic body or the magnetic segment to detect the rotational speed of the rotating shaft 10.

[0044] For example, such as Figure 1 , Figure 4 , Figure 5 , Figure 11 and Figure 12 As shown, the inner ring 21 is annular, and the outer ring 22 is annular and is fitted radially outside the inner ring 21. The rolling element 23 is disposed between the inner ring 21 and the outer ring 22, and rolls in the space between the inner ring 21 and the outer ring 22 to realize the rotation of the bearing 20. Preferably, both the magnetic body and the magnetic segment are permanent magnets, thereby ensuring the normal functioning of the Hall sensor 30.

[0045] When the motor 100 is running, if the shaft 10 includes a magnetic segment, the rotation of the shaft 10 causes a change in the magnetic field. The Hall sensor 30 detects the frequency of the magnetic field change in the magnetic segment to calculate the rotational speed and position of the shaft 10, thereby calculating the displacement of the object driven by the motor 100. For example, when the motor 100 is used in an electric vehicle door, the opening speed of the electric vehicle door can be calculated from the rotational speed of the motor 100. If the inner ring 21 is a magnetic body, the shaft 10 drives the inner ring 21 to rotate, causing a change in the magnetic field. The Hall sensor 30 detects the frequency of the magnetic field change in the magnetic body to calculate the speed of the object driven by the motor 100. The Hall sensor 30 also detects the number of pulses in the magnetic field change to calculate the displacement of the object driven by the motor 100.

[0046] It should be explained that the Hall sensor 30 detects a N pole or a S pole and generates a pulse. The number of pulses can be used to detect the number of rotations of the shaft 10. The displacement of the object driven by the motor 100 can be calculated from the number of rotations of the shaft 10. The frequency of magnetic field change can be calculated from the number of pulses generated per second. The rotational speed of the shaft 10 can be calculated from the frequency of magnetic field change.

[0047] The motor 100 of the present invention, by setting a magnetic body or magnetic segment, which cooperates with the Hall sensor 30, can calculate the displacement of the component driven by the motor 100, thereby ensuring the accuracy of the component movement. At the same time, compared with the prior art, which sets a separate magnetic ring structure to ensure that the Hall sensor 30 can detect the rotation speed of the shaft 10 normally, the motor 100 of this application does not need to set a separate magnetic ring structure. It only sets the inner ring 21 as a magnetic body, or includes a magnetic segment in the shaft 10, thereby reducing the number of parts used, effectively reducing production costs, and also reducing the size of the motor 100.

[0048] According to an embodiment of the present invention, the motor 100 can calculate the rotational speed of the motor 100 by setting a magnetic body or magnetic segment, which cooperates with the Hall sensor 30. This can ensure the accuracy of the movement of the drive components of the motor 100, reduce the use of parts, effectively reduce production costs, and reduce the size of the motor 100.

[0049] According to some embodiments of the present invention, with reference to Figure 1 , Figure 3 , Figure 4 and Figure 6At least one of the magnetic body and the magnetic segment includes a magnetic ring 211. That is, the magnetic body may include a magnetic ring 211, the magnetic segment may include a magnetic ring 211, or both the magnetic body and the magnetic segment may include a magnetic ring 211. The magnetic ring 211 includes a first magnetic pole region 2111 and a second magnetic pole region 2112. The first magnetic pole region 2111 and the second magnetic pole region 2112 are arranged alternately along the circumference of the magnetic ring 211. The number of first magnetic pole regions 2111 and the number of second magnetic pole regions 2112 are equal and their magnetic properties are opposite.

[0050] In this way, by setting the first magnetic pole region 2111 and the second magnetic pole region 2112 in the circumferential direction of the magnetic ring 211, the Hall sensor 30 detects the magnetic field changes of the first magnetic pole region 2111 and the second magnetic pole region 2112, thereby enabling the Hall sensor 30 to accurately identify the rotational speed of the motor 100. At the same time, the magnetic body and / or magnetic segment including the magnetic ring 211 can be selected according to actual needs, so that the inner ring 21 or the rotating shaft 10 can be magnetic, thereby improving the versatility of the motor 100.

[0051] For example, such as Figure 1 , Figure 3 , Figure 4 and Figure 6 As shown, taking a magnetic body including a magnetic ring 211 as an example, the magnetic ring 211 includes a first magnetic pole region 2111 and a second magnetic pole region 2112. If the first magnetic pole region 2111 is the N pole, then the second magnetic pole region 2112 is the S pole, and vice versa. Thus, the first magnetic pole region 2111 and the second magnetic pole region 2112 can be magnetically attracted to each other. The first magnetic pole region 2111 and the second magnetic pole region 2112 are arranged at intervals along the circumference of the magnetic ring 211 to ensure the uniformity of the magnetic field strength of each magnetic pole region on the magnetic ring 211. The magnetic ring 211 structure arrangement of the magnetic body and the magnetic segment is the same.

[0052] According to some optional embodiments of the present invention, refer to Figure 6 , Figure 7 , Figure 8 and Figure 9 The number of magnetic rings 211 is at least one, that is, the number of magnetic rings 211 can be one, two, three or more. When there are multiple magnetic rings 211, the multiple magnetic rings 211 are arranged in sequence along the radial direction of the inner ring 21. In two adjacent magnetic rings 211 in the radial direction of the inner ring 21, the first magnetic pole region 2111 of one magnetic ring 211 corresponds one-to-one with the second magnetic pole region 2112 of the other magnetic ring 211 and is directly opposite to it in the radial direction of the inner ring 21.

[0053] In this way, multiple magnetic rings 211 cooperate with Hall sensor 30. Hall sensor 30 can detect the magnetic field changes caused by each magnetic ring 211 and compare multiple sets of data to ensure the accuracy of Hall sensor 30 in detecting the speed of motor 100. At the same time, the magnetic pole regions of adjacent magnetic rings 211 are arranged reasonably to ensure that the first magnetic pole region 2111 and the second magnetic pole region 2112 adjacent in the radial direction are magnetically attracted to each other, thereby ensuring the rationality of the arrangement of magnetic rings 211.

[0054] For example, such as Figure 6 , Figure 7 and Figure 8 As shown, taking a magnetic body including a magnetic ring 211 as an example, the number of magnetic rings 211 is one. A magnetic ring 211 may include one first magnetic pole region 2111 and one second magnetic pole region 2112, or it may include two first magnetic pole regions 2111 and two second magnetic pole regions 2112, or it may include three first magnetic pole regions 2111 and three second magnetic pole regions 2112, as shown. Figure 9 As shown, there are two magnetic rings 211, which are arranged in sequence along the radial direction of the magnetic body. Each magnetic ring 211 includes three first magnetic pole regions 2111 and three second magnetic pole regions 2112. The magnetic segments have the same structure as the magnetic body.

[0055] Furthermore, such as Figure 10 As shown, there are two magnetic rings 211, which are arranged in sequence along the radial direction of the magnetic body. One magnetic ring 211 includes a first magnetic pole region 2111, and the other magnetic ring 211 includes a second magnetic pole region 2112.

[0056] Furthermore, such as Figure 6 , Figure 7 , Figure 8 , Figure 9 and Figure 10 As shown, when processing magnetic bodies or magnetic segments, magnetization can be performed along the axial direction of the magnetic ring 211 or along the radial direction of the magnetic ring 211.

[0057] According to some embodiments of the present invention, with reference to Figure 1 and Figure 3 A portion of the rotating shaft 10 is formed as a magnetic segment, and the magnetic segment is positioned close to the Hall sensor 30. This ensures that the Hall sensor 30 can detect changes in the magnetic field of the magnetic segment and thus ensures that the Hall sensor 30 can work normally.

[0058] Furthermore, the entire shaft 10 is formed as a magnetic segment. This facilitates the machining of the shaft 10 without needing to consider the magnetization position of the shaft 10.

[0059] According to some embodiments of the present invention, with reference to Figure 4 , Figure 5 and Figure 11 The inner ring 21 has a first groove 212 recessed radially inward along the inner ring 21 on its outer radially outer surface, and the outer ring 22 has a second groove 221 recessed radially outward along the outer ring 22 on its inner radial surface. The rolling element 23 is fitted into the first groove 212 and the second groove 221.

[0060] In this way, by setting the first groove 212 and the second groove 221, it is convenient to install the rolling element 23 in the space between the inner ring 21 and the outer ring 22, while ensuring that the rolling element 23 has sufficient rolling space, thereby ensuring the normal function of the bearing 20.

[0061] For example, such as Figure 4 , Figure 5 and Figure 11 As shown, the first groove 212 is recessed radially inward from the radially outer surface of the inner ring 21 along the inner ring 21, and the cross-section of the first groove 212 is arc-shaped. The second groove 221 is recessed radially outward from the radially inner surface of the outer ring 22, and the cross-section of the second groove 221 is arc-shaped. The rolling element 23 is spherical, with a portion of the rolling element 23 located in the first groove 212 and a portion of the rolling element 23 located in the second groove 221.

[0062] According to some embodiments of the present invention, with reference to Figure 3 , Figure 4 and Figure 5 The inner ring 21 is magnetic, and the rolling element 23 is a magnetic attractor configured to magnetically attract the inner ring 21. Therefore, the inner ring 21 always maintains a magnetic attraction to the rolling element 23, thereby creating a self-locking force on the bearing 20 and effectively preventing the bearing 20 from rotating on its own. This prevents the components driven by the motor 100 from moving with the shaft 10, thus ensuring the stability of the bearing 20 in a static state. Furthermore, compared to the existing technology that uses a worm gear to achieve self-locking of the shaft 10, this application has a simpler structure, lower cost, and does not affect the output power of the motor 100; therefore, it can be mass-produced.

[0063] It should be explained that both the first magnetic pole region 2111 and the second magnetic pole region 2112 have a magnetic attraction effect on the rolling element 23, thereby effectively ensuring the magnetic attraction force of the inner ring 21 on the rolling element 23 and effectively preventing the rolling element 23 from rotating relative to the outer ring 22. Preferably, the rolling element 23 is made of carbon steel, which facilitates the magnetic attraction of the inner ring 21 on the rolling element 23.

[0064] According to some embodiments of the present invention, with reference to Figure 1 and Figure 12The Hall sensor 30 includes a Hall element 31 and a mounting plate 32. The mounting plate 32 has a through hole 321, through which the rotating shaft 10 rotatably passes. The Hall element 31 is fixed to the mounting plate 32. Thus, the through hole 321 allows the rotating shaft 10 to easily pass through the mounting plate 32 and extend into the motor 100, facilitating the installation of the rotating shaft 10. Simultaneously, the mounting plate 32 provides a fixed position for the Hall element 31, facilitating its fixation.

[0065] For example, such as Figure 1 and Figure 12 As shown, the fixing plate 32 is an annular plate, and a circular through hole 321 is provided in the middle of the fixing plate 32. The rotating shaft 10 is rotatably inserted into the through hole 321. The Hall element 31 is fixed on the surface of the fixing plate 32. There can be multiple Hall elements 31, and multiple Hall elements 31 are arranged at intervals on the fixing plate 32. Each Hall element 31 corresponds to a corresponding magnetic ring 211.

[0066] According to some embodiments of the present invention, with reference to Figure 1 , Figure 2 and Figure 3 It includes: housing 40, rotor 50 and stator 60. Specifically, rotor 50 is located inside housing 40 and is fixed on rotating shaft 10. Rotor 50 and bearing 20 are arranged at intervals along the axial direction of rotating shaft 10. Stator 60 is fixed to the inner wall of housing 40 and is fitted on the radial outer side of rotor 50.

[0067] In this way, the housing 40 can provide space for the rotor 50 and stator 60, which facilitates the arrangement of the rotor 50 and stator 60. At the same time, the housing 40 can protect the rotor 50 and stator 60, preventing dust in the air from entering the housing 40 and affecting the normal operation of the motor 100, thereby ensuring the normal function of the motor 100.

[0068] For example, such as Figure 1 , Figure 2 and Figure 3 As shown, the housing 40 is a hollow cylindrical structure. The inner wall of the housing 40 is provided with a stator 60. The rotating shaft 10 is located inside the housing 40. The rotor 50 is sleeved on the rotating shaft 10 and is located on the radial inner side of the stator 60. The rotor 50 is wound with a winding 76. In the direction from left to right, the rotor 50, the bearing 20 and the Hall sensor 30 are arranged in sequence at intervals.

[0069] Furthermore, such as Figure 1 , Figure 2 and Figure 3As shown, the left end of the housing 40 is provided with a bearing clip 71, an oil-impregnated bearing 72, a wear-resistant pad 73, and a rubber pad 74. The bearing clip 71 is used to limit the left end of the rotating shaft 10. The oil-impregnated bearing 72 is used to lubricate the rotating shaft 10. The wear-resistant pad 73 is located at the left end of the rotating shaft 10 and between the rotating shaft 10 and the inner wall of the housing 40, thereby protecting the inner wall of the housing 40. The rubber pad 74 is used to absorb the vibration transmitted from the rotating shaft 10 to the housing 40, thereby further protecting the housing 40.

[0070] Furthermore, such as Figure 1 , Figure 2 and Figure 3 As shown, the surface of the winding 76 is coated with a protective layer, which can prevent the winding 76 from contacting other components, thereby ensuring the insulation effect of the winding 76 and improving the insulation and safety performance of the motor 100.

[0071] Furthermore, such as Figure 1 , Figure 2 and Figure 3 As shown, a commutator 75 is provided on the rotating shaft 10. The commutator 75 is located between the rotor 50 and the bearing 20. The commutator 75 is used to adjust the direction of rotation of the rotating shaft 10.

[0072] According to a second aspect embodiment of the vehicle, referring to Figure 1 , Figure 2 and Figure 3 This includes the motor 100 of the first aspect of this embodiment.

[0073] According to an embodiment of the present invention, by providing a motor 100 as described in the first aspect embodiment, and by providing a magnetic body or magnetic segment, which cooperates with a Hall sensor 30, the rotational speed of the motor 100 can be calculated, thereby ensuring the accuracy of the movement of the motor 100 driving components. At the same time, the use of parts can be reduced, production costs can be effectively reduced, and the size of the motor 100 can be reduced.

[0074] According to some embodiments of the present invention, with reference to Figure 1 and Figure 2 The vehicle includes a reduction mechanism connected to the rotating shaft 10 of the motor 100. The reduction mechanism limits the reduction ratio of the rotating shaft 10, thereby adjusting the speed of the motor 100. Simultaneously, the self-locking force of the inner ring 21 on the rolling element 23 is amplified by the reduction mechanism, effectively ensuring the reduction effect of the reduction mechanism on the rotating shaft 10.

[0075] It should be noted that the self-locking force of the reduction mechanism on the motor 100 is the product of the self-locking force of the inner ring 21 on the rolling element 23 and the reduction ratio of the reduction mechanism.

[0076] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0077] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0078] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a communication connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0079] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0080] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. An electric motor (100), characterized in that, include: The device comprises a rotating shaft (10), a bearing (20), and a Hall sensor (30). The bearing (20) includes an inner ring (21), an outer ring (22), and rolling elements (23). The rolling elements (23) are disposed between the inner ring (21) and the outer ring (22). The inner ring (21) is sleeved and fixed on the rotating shaft (10). Wherein, the inner ring (21) is a magnetic body, and / or, the rotating shaft (10) includes a magnetic segment, and the Hall sensor (30) is used to cooperate with the magnetic body or the magnetic segment to detect the rotational speed of the rotating shaft (10).

2. The motor (100) according to claim 1, characterized in that, At least one of the magnetic body and the magnetic segment includes a magnetic ring (211), the magnetic ring (211) including a first magnetic pole region (2111) and a second magnetic pole region (2112), the first magnetic pole region (2111) and the second magnetic pole region (2112) are arranged alternately along the circumference of the magnetic ring (211), the first magnetic pole region (2111) and the second magnetic pole region (2112) are equal in number and have opposite magnetic properties.

3. The motor (100) according to claim 2, characterized in that, The number of magnetic rings (211) is at least one. When the number of magnetic rings (211) is multiple, the multiple magnetic rings (211) are arranged sequentially along the radial direction of the inner ring (21). In two adjacent magnetic rings (211) in the radial direction of the inner ring (21), the first magnetic pole region (2111) of one magnetic ring (211) corresponds one-to-one with the second magnetic pole region (2112) of the other magnetic ring (211) and is directly opposite to each other in the radial direction of the inner ring (21).

4. The motor (100) according to claim 1, characterized in that, A portion of the rotating shaft (10) is formed as the magnetic segment, and the magnetic segment is located close to the Hall sensor (30), or the entire rotating shaft (10) is formed as the magnetic segment.

5. The motor (100) according to claim 1, characterized in that, The outer radial surface of the inner ring (21) is provided with a first groove (212) that is recessed inward along the inner ring (21) and the inner radial surface of the outer ring (22) is provided with a second groove (221) that is recessed outward along the outer ring (22) and the rolling element (23) is fitted into the first groove (212) and the second groove (221).

6. The motor (100) according to claim 1, characterized in that, The inner ring (21) is a magnetic body, and the rolling body (23) is a magnetic attractor and is configured to magnetically attract the inner ring (21).

7. The motor (100) according to any one of claims 1-6, characterized in that, The Hall sensor (30) includes: Hall element (31); A fixing plate (32) is provided with a through hole (321), the rotating shaft (10) is rotatably inserted into the through hole (321), and the Hall element (31) is fixed on the fixing plate (32).

8. The motor (100) according to claim 7, characterized in that, The inner ring (21) is a magnetic material, and the Hall element (31) and the inner ring (21) are arranged opposite each other in the axial direction of the rotating shaft (10).

9. The motor (100) according to any one of claims 1-6, characterized in that, include: Casing (40); The rotor (50) is located inside the housing (40), and the rotor (50) is sleeved and fixed on the rotating shaft (10). The rotor (50) and the bearing (20) are arranged at intervals along the axial direction of the rotating shaft (10). The stator (60) is fixed to the inner wall of the housing (40) and is sleeved on the radial outer side of the rotor (50).

10. A vehicle, characterized in that, Includes the motor (100) according to any one of claims 1-9.

11. The vehicle according to claim 10, characterized in that, include: A speed reduction mechanism is connected to the shaft (10) of the motor (100).

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