Electric motor, electric drive device, electric drive system and electric apparatus

Abstract

An electric motor (10), an electric drive device (1), an electric drive system and an electric apparatus. The electric motor (10) comprises a housing (11), a bearing (15), a rotor (12), a stator (13) and an anti-electrocorrosion assembly (14), wherein the housing (11) has an accommodating cavity (1111); the rotor (12) is mounted on the housing (11); the rotor (12) comprises a rotor body (121) and a rotating shaft (122), with the rotating shaft (122) being connected to the rotor body (121); the stator (13) is mounted in the accommodating cavity (1111); and the anti-electrocorrosion assembly (14) is mounted on the housing (11), and comprises a magnetic ring (141) and a grounding conductive member (142), with the magnetic ring (141) being sleeved on the rotating shaft (122), and the grounding conductive member (142) being mounted on the magnetic ring (141) and electrically connected to the rotating shaft (122).

Description

Electric motors, electric drive units, electric drive systems and electric equipment

[0001] Cross-references

[0002] This application incorporates Chinese Patent Application No. 202410993773.8, filed on July 23, 2024, entitled “Electric Machine, Electric Drive Device, Electric Drive System and Electric Equipment”, which is incorporated herein by reference in its entirety. Technical Field

[0003] This application relates to the field of motor technology, specifically to a motor, an electric drive device, an electric drive system, and an electric equipment. Background Technology

[0004] An electric motor is a power device used to convert electrical energy into mechanical energy. An electric motor typically consists of a housing, a stator, a rotor, and bearings. The stator is fixedly mounted on the housing, while the rotor is rotatably mounted on the housing via bearings. During motor operation, current flows through the rotor's shaft and is transmitted to the bearings, causing electrolytic corrosion, which negatively impacts the motor's performance. Summary of the Invention

[0005] The purpose of this application is to provide an electric motor, electric drive device, electric drive system, and electric equipment to solve the technical problem that electric motor bearings are prone to electrolytic corrosion in related technologies.

[0006] To achieve the above objectives, the technical solution adopted in this application embodiment is: to provide a motor, comprising:

[0007] The outer shell has a cavity;

[0008] The bearing is mounted on the housing;

[0009] The rotor is rotatably mounted on the housing via bearings. The rotor includes a rotor body and a shaft, which is connected to the rotor body.

[0010] The stator is fixedly installed in the cavity and is magnetically coupled to the rotor body to drive the rotor to rotate.

[0011] An anti-electro-optical corrosion assembly is installed on the housing. The anti-electro-optical corrosion assembly includes a magnetic ring and a grounding conductive component. The magnetic ring is sleeved on the rotating shaft, and the grounding conductive component is installed on the magnetic ring and electrically connected to the rotating shaft.

[0012] The motor provided in this application embodiment has at least the following beneficial effects: By sleeved a magnetic ring on the shaft and electrically connected a grounding conductive component to the shaft, the magnetic ring can reduce the frequency of common-mode current change on the shaft and delay the change time of common-mode current through its inductive characteristics, thereby suppressing common-mode current. At the same time, the grounding conductive component can introduce the shaft current on the shaft to the ground. In this way, the current flowing through the bearing can be effectively reduced, the risk of bearing erosion can be effectively reduced, and the working performance of the motor can be effectively improved.

[0013] In some embodiments of this application, the grounding conductive element includes a first connecting portion, which abuts against the rotating shaft to make the grounding conductive element electrically connected to the rotating shaft.

[0014] By adopting the above technical solution, the grounding conductive component can remain in contact with the shaft during the rotation of the shaft, so as to continuously introduce the shaft current on the shaft into the ground, further reducing the risk of bearing erosion and thus further improving the working performance of the motor.

[0015] In some embodiments of this application, the first connecting portion abuts against the outer peripheral wall of the rotating shaft to form a contact point, and the cross-section of the outer peripheral wall of the rotating shaft through the contact point is inclined to the first connecting portion.

[0016] By adopting the above technical solution, the contact force between the first connecting part and the rotating shaft can be reduced, thereby effectively reducing the wear of the first connecting part during the rotation of the rotating shaft.

[0017] In some embodiments of this application, the angle α formed by the first connecting portion and the tangent is: 30°≤α<90°.

[0018] By adopting the above technical solution, not only can the wear caused by the first connecting part during the rotation of the shaft be reduced, but the space occupied by the first connecting part can also be reduced, making the internal structure of the motor more compact and thus effectively reducing the size of the motor.

[0019] In some embodiments of this application, the first connecting portion is a flexible component.

[0020] By adopting the above technical solution, the wear caused by the first connecting part during the rotation of the shaft is effectively reduced.

[0021] In some embodiments of this application, the outer casing is electrically connected to the ground, and the grounding conductive element further includes a second connecting portion connected to the outer casing, and a first connecting portion connected to the second connecting portion, so that the grounding conductive element is electrically connected to the outer casing.

[0022] By adopting the above technical solution, the structure of the motor can be effectively simplified by connecting the grounding conductive component to the earth.

[0023] In some embodiments of this application, the second connecting portion is pressed against the outer peripheral wall of the magnetic ring and the outer shell.

[0024] By adopting the above technical solution, the structure of the motor is further simplified so that the second connecting part can be connected to the outer casing.

[0025] In some embodiments of this application, the outer casing is electrically connected to the ground, and the grounding conductive element is electrically connected to the outer casing through a magnetic ring.

[0026] By adopting the above technical solution, the structure of the motor can be effectively simplified by connecting the grounding conductive component to the earth.

[0027] In some embodiments of this application, the anti-electro-erosion component further includes an elastic element disposed between the magnetic ring and the grounding conductive element, so that the grounding conductive element presses against the rotating shaft.

[0028] By adopting the above technical solution, the elastic element can provide the grounding conductive element with an elastic force to press against the rotating shaft, so that the grounding conductive element can maintain contact with the rotating shaft, thereby reducing the risk of the grounding conductive element separating from the rotating shaft and further improving the working performance of the motor.

[0029] In some embodiments of this application, the magnetic ring has a mounting hole, and the elastic element is disposed in the mounting hole.

[0030] By adopting the above technical solutions, the internal structure of the motor can be made more compact, thereby effectively reducing the size of the motor.

[0031] In some embodiments of this application, the magnetic ring has a first limiting part at the port of the mounting hole facing the rotating shaft, and the grounding conductive element includes a second limiting part disposed in the mounting hole, the second limiting part being engaged with the first limiting part.

[0032] By adopting the above technical solution, the risk of the grounding conductive component detaching from the magnetic ring is effectively reduced, thereby further improving the working performance of the motor.

[0033] In some embodiments of this application, the housing includes a shell, a cover, and a mounting base. The shell has a cavity, the cover is disposed on the shell to close the cavity, the mounting base is connected to the shell or the cover, and the anti-electro-erosion component is mounted on the mounting base.

[0034] By adopting the above technical solution, it is easy to install the anti-electro-erosion components on the housing.

[0035] In some embodiments of this application, there are multiple grounding conductive elements, which are distributed circumferentially along the axis of rotation.

[0036] By adopting the above technical solution, the shaft current on the rotating shaft can be introduced to the ground more effectively, further reducing the current flowing through the bearing, further reducing the risk of bearing erosion, and thus further improving the working performance of the motor.

[0037] In some embodiments of this application, the magnetic ring is coaxially arranged with the rotating shaft.

[0038] By adopting the above technical solution, not only can the magnetic ring more effectively block or weaken the common-mode current on various coupling capacitors inside the motor, but the magnetic flux generated by the magnetic ring under the action of the common-mode current can also be superimposed to form a stronger magnetic field, so as to further suppress the common-mode current on the shaft, further reduce the current flowing through the bearing, further reduce the risk of bearing erosion, and thus further improve the working performance of the motor.

[0039] In some embodiments of this application, the magnetic ring is a circular ring.

[0040] By adopting the above technical solution, the magnetic flux generated by the magnetic ring under the action of common mode current can be more effectively superimposed to form a stronger magnetic field, which further suppresses the common mode current on the shaft, further reduces the current flowing through the bearing, further reduces the risk of bearing erosion, and thus further improves the working performance of the motor.

[0041] This application also provides an electric drive device, including the motor described in any of the above embodiments.

[0042] The electric drive device provided in this application embodiment has at least the following beneficial effects: the electric drive device provided in this application embodiment effectively improves the working performance of the electric drive device by using the motor described in any of the above embodiments.

[0043] This application also provides an electric drive system, including a battery and the above-mentioned electric drive device, wherein the battery is electrically connected to a motor.

[0044] The electric drive system provided in this application embodiment has at least the following beneficial effects: the electric drive system provided in this application embodiment effectively improves the working performance of the electric drive system by adopting the above-mentioned electric drive device.

[0045] This application also provides an electric device, including the above-described electric drive device or the above-described electric drive system.

[0046] The electric equipment provided in this application embodiment has at least the following beneficial effects: the electric equipment provided in this application embodiment effectively improves the working performance of the electric equipment by adopting the above-mentioned electric drive device or the above-mentioned electric drive system. Attached Figure Description

[0047] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0048] Figure 1 is a structural schematic diagram of the vehicle provided in an embodiment of this application;

[0049] Figure 2 is a schematic diagram of the exploded structure of the battery provided in an embodiment of this application;

[0050] Figure 3 is a schematic diagram of the structure of the electric drive device provided in an embodiment of this application;

[0051] Figure 4 is a schematic diagram of the structure of a motor provided in an embodiment of this application;

[0052] Figure 5 is a schematic diagram of the anti-electro-erosion component in the motor shown in Figure 4;

[0053] Figure 6 is an enlarged structural diagram of point A of the motor shown in Figure 4;

[0054] Figure 7 is a schematic diagram of the structure of a motor provided in another embodiment of this application;

[0055] Figure 8 is an enlarged structural diagram of point B of the motor shown in Figure 7;

[0056] Figure 9 is a schematic diagram of the structure of a motor provided in another embodiment of this application;

[0057] Figure 10 is an enlarged structural diagram of the motor at point C shown in Figure 9;

[0058] Figure 11 is a schematic diagram of the structure of a motor provided in another embodiment of this application;

[0059] Figure 12 is an enlarged structural diagram of the motor at point D shown in Figure 11;

[0060] Figure 13 is a schematic diagram of the structure of a motor provided in another embodiment of this application;

[0061] Figure 14 is an enlarged structural diagram of the motor at point E shown in Figure 13.

[0062] In the figures, the following are the reference numerals: 1. Electric drive device; 10. Motor; 11. Housing; 111. Shell; 1111. Cavity; 112. Mounting base; 12. Rotor; 121. Rotor body; 122. Shaft; 13. Stator; 14. Anti-electro-erosion component; 141. Magnetic ring; 1411. Mounting hole; 1412. First limiting part; 142. Grounding conductive element; 1421. First connecting part; 1422. Second connecting part; 1423. Third connecting part; 1424. Second limiting part; 143. Elastic element; 15. Bearing; 20. Controller; 30. Transmission mechanism; 2. Battery; 21. Housing; 211. First part; 212. Second part; 22. Battery cell; 3. Vehicle body. Detailed Implementation

[0063] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0064] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0065] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application 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 application.

[0066] Furthermore, the terms "first," "second," "third," "fourth," "fifth," "sixth," "seventh," "eighth," "ninth," and "tenth" 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. Therefore, a feature defined with "first," "second," "third," "fourth," "fifth," "sixth," "seventh," "eighth," "ninth," and "tenth" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0067] An electric motor is the power unit of an electrical device. It converts electrical energy into mechanical energy to drive the operation of the device. An electric motor typically consists of a housing, a stator, a rotor, and bearings. The stator is fixedly mounted inside the cavity of the housing, while the rotor is rotatably mounted on the housing via bearings.

[0068] In related technologies, during motor operation, current flows through the rotor shaft. This current is commonly referred to as shaft current. Shaft current mainly includes common-mode current and EDM (Electrostatic Discharge Machining Current). Common-mode current is mainly formed by the interaction between the common-mode voltage and the coupling capacitance existing between components such as the housing, stator core laminations, stator windings, and rotor shaft. EDM current is mainly caused by the high du / dt (voltage change rate) of the inverter output common-mode voltage, which induces high-frequency charging and discharging currents in the parasitic capacitance of the motor. Shaft current is transmitted to the bearings through the rotor shaft, causing electrolytic corrosion in the bearings, which is detrimental to improving motor performance.

[0069] To reduce the risk of bearing erosion, the motor provided in this application provides a magnetic ring fitted onto the shaft and a grounding conductive element electrically connected to the shaft. The magnetic ring can reduce the frequency of common-mode current changes on the shaft and delay the change time of common-mode current through its inductive characteristics, thereby suppressing common-mode current. At the same time, the grounding conductive element can introduce the shaft current on the shaft to the ground. In this way, the current flowing through the bearing can be effectively reduced, the risk of bearing erosion can be effectively reduced, and the working performance of the motor can be effectively improved.

[0070] The technical solutions described in this application are applicable to electric drive devices using motors and electric equipment using electric drive devices. The electric equipment can be, but is not limited to, vehicles, ships, spacecraft, and electric toys, etc. Vehicles can be gasoline-powered vehicles, natural gas-powered vehicles, or new energy vehicles; new energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. Spacecraft include airplanes, rockets, space shuttles, and spacecraft, etc. Electric toys include stationary or mobile electric toys, such as electric car toys, electric ship toys, and electric airplane toys, etc.

[0071] For ease of explanation, the following embodiments will use a vehicle as an example of the electric device in one embodiment of this application.

[0072] Please refer to Figure 1, which is a structural schematic diagram of the vehicle provided in this embodiment. The vehicle includes a body 3, a battery 2, and an electric drive unit 1. The body 3 is the main supporting component of the vehicle, and has an engine compartment and a passenger compartment. The engine compartment is used to house the electric drive unit 1, and the passenger compartment provides operating and seating space for the driver and passengers. When the vehicle is a front-wheel drive vehicle, the engine compartment is located at the front of the body 3, i.e., the engine compartment is the front engine compartment; when the vehicle is a rear-wheel drive vehicle, the engine compartment is located at the rear of the body 3, i.e., the engine compartment is the rear engine compartment; when the vehicle is a four-wheel drive vehicle, the engine compartment is divided into a front engine compartment and a rear engine compartment, with the front engine compartment located at the front of the body 3 and the rear engine compartment located at the rear of the body 3. There can be two electric drive units 1, one in the front engine compartment and one in the rear engine compartment. The battery 2 and the electric drive unit 1 together constitute the electric drive system of the vehicle. Battery 2 can be located at the bottom, front, or rear of the vehicle. Battery 2 can supply power to electric drive unit 1 to drive electric drive unit 1. Electric drive unit 1 is used to convert the electrical energy provided by battery 2 into mechanical energy and output the mechanical energy to the wheels of the vehicle to drive the vehicle.

[0073] Please refer to Figure 2, which is an exploded view of the battery 2 provided in an embodiment of this application. The battery 2 includes a housing 21 and a battery cell 22, with the battery cell 22 housed within the housing 21. The housing 21 provides a space for the battery cell 22, and can have various structures. In some embodiments, the housing 21 may include a first portion 211 and a second portion 212, which overlap each other, jointly defining a space for accommodating the battery cell 22. The second portion 212 may be a hollow structure with one open end, and the first portion 211 may be a plate-like structure, covering the open side of the second portion 212 so that the first portion 211 and the second portion 212 jointly define the space. Alternatively, the first portion 211 and the second portion 212 may both be hollow structures with one open side, with the open side of the first portion 211 covering the open side of the second portion 212 so that the first portion 211 and the second portion 212 jointly define the space. Of course, the box 21 formed by the first part 211 and the second part 212 can be of various shapes, such as cylinder, cuboid, etc., and no specific limitation is made here.

[0074] In some embodiments, the housing 21 may be part of the vehicle's chassis structure. For example, a portion of the housing 21 may be at least a portion of the vehicle's floor, or a portion of the housing 21 may be at least a portion of the vehicle's crossbeams and longitudinal beams.

[0075] Of course, in some embodiments, the battery 2 may not include the housing 21, but rather multiple battery cells 22 are electrically connected and assembled into the vehicle after being formed into a whole by necessary fixing structures.

[0076] In battery 2, there can be multiple battery cells 22, which can be connected in series, parallel, or in a mixed manner. A mixed connection means that multiple battery cells 22 are connected in both series and parallel configurations. Multiple battery cells 22 can be directly connected in series, parallel, or in a mixed manner, and then the entire assembly of the multiple battery cells 22 is housed within the casing 21. Alternatively, battery 2 can also consist of multiple battery cells 22 first connected in series, parallel, or in a mixed manner to form a battery module, and then multiple battery modules connected in series, parallel, or in a mixed manner to form a whole, which is also housed within the casing 21. Battery 2 may also include other functional components; for example, it may include a busbar for electrical connection between the multiple battery cells 22.

[0077] Each battery cell 22 can be a secondary battery cell or a primary battery cell. A secondary battery cell refers to a battery cell 22 that can be recharged to activate its active materials and continue to be used after being discharged. A primary battery cell refers to a battery cell 22 that cannot be recharged to activate its active materials and continue to be used after its electrical energy is depleted. The battery cell 22 can also be a lithium-ion battery cell, a sodium-ion battery cell, a sodium-lithium-ion battery cell, a lithium metal battery cell, a sodium metal battery cell, a lithium-sulfur battery cell, a magnesium-ion battery cell, a nickel-metal hydride battery cell, a nickel-cadmium battery cell, a lead-acid battery cell, etc., but is not limited thereto. The battery cell 22 can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or a battery cell 22 of other shapes. Prismatic battery cells include prismatic battery cells, blade-shaped battery cells, and multi-prismatic battery cells, such as hexagonal prismatic battery cells, etc. This application does not have any particular limitations.

[0078] Please refer to Figure 3, which is a schematic diagram of the structure of the electric drive device 1 provided in an embodiment of this application. The electric drive device 1 includes a motor 10, which converts the electrical energy provided by the battery 2 into mechanical energy. The motor 10 can be, but is not limited to, an axial flux motor, a radial flux motor, a servo motor, a brushed motor, a brushless motor, etc. In some embodiments, there are two motors 10, which are coaxially arranged, that is, the central axes of the two motors 10 coincide. The "central axis" of the motor 10 refers to the axial center line of the rotating shaft 122 (or "rotor shaft") of the motor 10. As an example, the rotating shaft 122 of one motor 10 is connected to one of the left front wheel and the right front wheel of the vehicle, and the rotating shaft 122 of the other motor 10 is connected to the other of the left front wheel and the right front wheel of the vehicle; or, the rotating shaft 122 of one motor 10 is connected to one of the left rear wheel and the right rear wheel of the vehicle, and the rotating shaft 122 of the other motor 10 is connected to the other of the left rear wheel and the right rear wheel of the vehicle. During the operation of the electric drive device 1, the two motors 10 can rotate at the same speed or at different speeds.

[0079] Of course, in other embodiments, the number of motors 10 may also be one.

[0080] In some embodiments, the electric drive device 1 may further include a controller 20. The controller 20 is used to convert the direct current output by the battery 2 into alternating current and transmit the alternating current to the motor 10. The controller 20 may also be used to control the operation of the motor 10, for example, to control the start / stop, speed, torque, etc. of the motor 10. In other words, both the motor 10 and the battery 2 are electrically connected to the controller 20. The direct current output by the battery 2 can be transmitted to the controller 20 through the current transmission path between the battery 2 and the controller 20. After the controller 20 converts the direct current into alternating current, the alternating current can be transmitted to the motor 10 through the current transmission path between the controller 20 and the motor 10 to drive the motor 10 to operate. At the same time, the control signal of the controller 20 can be transmitted to the motor 10 through the current transmission path between the controller 20 and the motor 10, and the operating status signal of the motor 10 can be transmitted to the controller 20 through the current transmission path between the controller 20 and the motor 10 to realize the controller 20 controlling the operation of the motor 10.

[0081] In some embodiments, the electric drive device 1 may further include a transmission mechanism 30, which transmits the mechanical energy to the vehicle wheels by changing the rotational speed and torque of the motor 10. For example, the transmission mechanism 30 transmits the mechanical energy to the vehicle wheels by decreasing the rotational speed of the motor 10 and increasing the torque of the motor 10; or, for instance, the transmission mechanism 30 transmits the mechanical energy to the vehicle wheels by increasing the rotational speed of the motor 10 and decreasing the torque of the motor 10. The transmission mechanism 30 may be, but is not limited to, a gear transmission mechanism, a worm gear transmission mechanism, a planetary gear transmission mechanism, a continuously variable transmission mechanism, etc.

[0082] To illustrate the technical solutions provided in this application, the following detailed description is provided in conjunction with specific drawings and embodiments.

[0083] Firstly, referring to Figures 4 to 6, this application provides an embodiment of a motor 10, including a housing 11, a bearing 15, a rotor 12, a stator 13, and an anti-electro-erosion assembly 14. The housing 11 has a cavity 1111, and the bearing 15 is mounted on the housing 11. The rotor 12 is rotatably mounted on the housing 11 via the bearing 15. The rotor 12 includes a rotor body 121 and a shaft 122, with the shaft 122 connected to the rotor body 121. The stator 13 is fixedly mounted within the cavity 1111 and is magnetically coupled to the rotor body 121 to drive the rotor 12 to rotate. The anti-electro-erosion assembly 14 is mounted on the housing 11 and includes a magnetic ring 141 and a grounding conductive element 142. The magnetic ring 141 is sleeved on the shaft 122, and the grounding conductive element 142 is mounted on the magnetic ring 141 and electrically connected to the shaft 122.

[0084] The housing 11 is a component for providing an internal mounting environment for the motor 10, wherein at least a portion of the internal mounting environment of the motor 10 constitutes the aforementioned cavity 1111, and at least a portion of the stator 13, rotor body 121, and shaft 122 are housed within the cavity 1111. The housing 11 can be a one-piece molded component or an assembled component composed of multiple parts. In some embodiments, to facilitate the assembly of the stator 13 and rotor 12 into the cavity 1111, the housing 11 may include a shell 111 and an end cap. The shell 111 defines the internal mounting environment of the motor 10. The stator 13 and rotor 12 can be placed in the cavity 1111 first, and then the stator 13 and rotor 12 can be assembled within the cavity 1111. After the assembly of the stator 13 and rotor 12 is completed, the end cap is placed over the opening of the shell 111 to isolate the internal mounting environment of the motor 10 from the external environment of the motor 10. The material of the housing 11 can be, but is not limited to, copper, iron, aluminum, stainless steel, aluminum alloy, etc.

[0085] In some embodiments, the housing 11 further includes a mounting base 112, which is connected to the housing 111 or the cover, and the anti-electro-erosion component 14 is mounted on the mounting base 112. As an example, the mounting base 112 has a ring-shaped structure, and the anti-electro-erosion component 14 is mounted in the inner ring space of the mounting base 112. For example, the magnetic ring 141 can be interference-fitted with the mounting base 112, that is, the outer peripheral wall of the magnetic ring 141 is tightly fitted with the inner peripheral wall of the mounting base 112, so that the anti-electro-erosion component 14 is fixed on the mounting base 112.

[0086] The stator 13 is the fixed part of the motor 10 and is used to drive the rotor 12 to rotate. The stator 13 may include a first iron core and a first winding. The first iron core is fixedly installed in the cavity 1111, and the first winding is wound on the first iron core. In some embodiments, the first iron core has a first winding slot, and the first winding is wound in the first winding slot.

[0087] The rotor 12 is the rotating part of the motor 10. The rotor body 121 is magnetically coupled to the stator 13, and the rotating shaft 122 is coaxially connected to the rotor body 121. The rotor body 121 may include a second iron core and a second winding, with the second winding wound around the second iron core. In some embodiments, the second iron core has a second winding slot, and the second winding is wound within the second winding slot.

[0088] During the operation of the motor 10, current can be input to the first winding to generate an electromagnetic field. The first iron core is used to conduct the electromagnetic field so that the electromagnetic field acts on the rotor body 121. Under the action of the electromagnetic field, the rotor body 121 rotates, thereby driving the rotating shaft 122 to rotate.

[0089] The bearing 15 is a component used to support the rotor 12. In some embodiments, the housing 11 has a shaft hole, and the bearing 15 is installed in the shaft hole and sleeved on the rotating shaft 122. There can be two bearings 15, and correspondingly, there are also two shaft holes. The two bearings 15 are arranged in a one-to-one correspondence with the two shaft holes. One bearing 15 is sleeved on one end of the rotating shaft 122, and the other bearing 15 is sleeved on the other end of the rotating shaft 122.

[0090] In some embodiments, the motor 10 may further include a cooling medium, which is a medium used to absorb heat generated by the stator 13 and other heat-generating components. The cooling medium may be contained within a cavity 1111, and at least a portion of the stator 13 may be immersed in the cooling medium to cool the stator 13. The cooling medium may also enter the cavity 1111 during circulation, and may be in direct or indirect contact with the stator 13, thereby carrying away the heat generated by the stator 13 during operation and cooling the stator 13. The cooling medium may be, but is not limited to, cooling oil, cooling water, etc.

[0091] The anti-electrostatic corrosion component 14 is used to reduce or eliminate the shaft current flowing through the bearing 15. The number of anti-electrostatic corrosion components 14 can be one or more. In some embodiments, the number of anti-electrostatic corrosion components 14 is one, and the anti-electrostatic corrosion component 14 can be disposed on either end of the rotating shaft 122. In other embodiments, the number of anti-electrostatic corrosion components 14 is two, and the two anti-electrostatic corrosion components 14 can be disposed at opposite ends of the rotating shaft 122.

[0092] The magnetic ring 141 is made of a high-permeability material, which can be, but is not limited to, iron oxide, nickel-zinc, cobalt-iron, barium ferrite, and AlNiCo ferrite. The magnetic ring 141 is fitted onto the rotating shaft 122. During the operation of the motor 10, the magnetic ring 141 acts as a common-mode inductor. When a high-frequency common-mode current flows through the rotating shaft 122, the magnetic ring 141 utilizes its magnetic permeability to reduce the frequency and delay the change time of the common-mode current, thereby reducing the number of impacts of the common-mode current on the rotating shaft 122 and the bearing 15. Simultaneously, due to its high permeability, the magnetic ring 141 can effectively concentrate and guide the magnetic field. When a high-frequency common-mode current passes through the magnetic ring 141, its high permeability leads to energy loss, converting a portion of the high-frequency common-mode current's energy into heat energy, thus reducing the high-frequency common-mode current flowing through the rotating shaft 122. The shape of the magnetic ring 141 can be, but is not limited to, circular, square, or equilateral triangular shapes.

[0093] The grounding conductor 142 is used to introduce the shaft current on the rotating shaft 122 to the ground, thereby short-circuiting the bearing 15 and reducing or eliminating the shaft current flowing through the bearing 15. The grounding conductor 142 can be, but is not limited to, a carbon brush, braided copper strip, copper ring, etc. The grounding conductor 142 can be directly grounded or grounded through other conductive parts of the motor 10. The grounding conductor 142 is mounted on the magnetic ring 141; in other words, the grounding conductor 142 and the magnetic ring 141 are connected as a whole. The grounding conductor 142 can be fixedly connected to the magnetic ring 141, for example, by fastening it to the magnetic ring 141 with fasteners such as bolts or screws. The grounding conductor 142 can also be movably connected to the magnetic ring 141, meaning that after the grounding conductor 142 is mounted on the magnetic ring 141, the grounding conductor 142 can move relative to the magnetic ring 141; for example, the grounding conductor 142 can move relative to the magnetic ring 141 in a direction away from or towards the rotating shaft 122.

[0094] The motor 10 provided in this application embodiment uses a magnetic ring 141 sleeved on a rotating shaft 122 and a grounding conductive element 142 electrically connected to the rotating shaft 122. The magnetic ring 141 can reduce the frequency of change of common mode current on the rotating shaft 122 and delay the change time of common mode current through its inductive characteristics, thereby suppressing common mode current. At the same time, the grounding conductive element 142 can introduce the shaft current on the rotating shaft 122 to the ground. In this way, the current flowing through the bearing 15 can be effectively reduced, the risk of electrolytic corrosion of the bearing 15 can be effectively reduced, and the working performance of the motor 10 can be effectively improved.

[0095] In addition, by mounting the grounding conductive element 142 on the magnetic ring 141, the magnetic ring 141 can be used as a mounting bracket for the grounding conductive element 142, which effectively reduces the number of parts in the anti-electro-erosion component 14, making the structure of the anti-electro-erosion component 14 more compact, effectively optimizing the internal layout structure of the motor 10, and thus effectively improving the internal space utilization of the motor 10.

[0096] In some embodiments of this application, please refer to Figures 7 and 8 together. The grounding conductive member 142 includes a first connecting portion 1421, which abuts against the rotating shaft 122 to make the grounding conductive member 142 electrically connected to the rotating shaft 122.

[0097] The first connecting portion 1421 is a part for contacting the rotating shaft 122. The first connecting portion 1421 can be rod-shaped, sheet-shaped, or block-shaped. In some embodiments, the first connecting portion 1421 is disposed within the inner ring space of the magnetic ring 141, and the first connecting portion 1421 protrudes from the inner peripheral wall of the magnetic ring 141 to the outer peripheral wall of the rotating shaft 122, so that the structure of the anti-electro-erosion assembly 14 becomes more compact. Of course, in other embodiments, the first connecting portion 1421 can also be disposed on other parts of the magnetic ring 141, for example, the first connecting portion 1421 can be disposed on the end face of the magnetic ring 141.

[0098] By adopting the above technical solution, the grounding conductive component 142 can remain in contact with the rotating shaft 122 during the rotation of the rotating shaft 122, so as to continuously introduce the shaft current on the rotating shaft 122 into the ground, further reducing the risk of electrical erosion of the bearing 15, thereby further improving the working performance of the motor 10.

[0099] In some embodiments of this application, please refer to FIG8. The first connecting portion 1421 abuts against the outer peripheral wall of the rotating shaft 122 to form a contact point. The cross-section of the outer peripheral wall of the rotating shaft 122 passing through the contact point is inclined to the first connecting portion 1421.

[0100] Understandably, the axial section of the rotating shaft 122 is circular, that is, the rotating shaft 122 is a circular shaft. The tangent is a plane that passes through a generatrix of the rotating shaft 122 and is perpendicular to the radius of the rotating shaft 122. The contact point between the first connecting part 1421 and the outer peripheral wall of the rotating shaft 122 is located on the generatrix through which the tangent passes.

[0101] In some embodiments, the first connecting portion 1421 has a rod-shaped structure, for example, the first connecting portion 1421 is a carbon rod, and the first connecting portion 1421 is inclined to the cut surface.

[0102] As an example, the first connecting part 1421 is inclined both to the cut surface and to the central axis of the rotating shaft 122.

[0103] As an example, the first connecting part 1421 is inclined to the cut surface and perpendicular to the central axis of the rotating shaft 122.

[0104] By adopting the above technical solution, the contact force between the first connecting part 1421 and the rotating shaft 122 can be reduced, thereby effectively reducing the wear of the first connecting part 1421 during the rotation of the rotating shaft 122.

[0105] In some embodiments of this application, please refer to FIG8, the angle α formed by the first connecting part 1421 and the cut surface is: 30°≤α<90°.

[0106] The angle α between the first connecting part 1421 and the cut surface can be determined according to the actual application needs, and can be 30°, 35°, 40°, 45°, 50°, 55°, 60°, 65°, 70°, 75°, 80°, 85°, etc.

[0107] By adopting the above technical solution, not only can the wear caused by the first connecting part 1421 during the rotation of the shaft 122 be reduced, but the space occupied by the first connecting part 1421 can also be reduced, making the internal structure of the motor 10 more compact, thereby effectively reducing the volume of the motor 10.

[0108] In some embodiments of this application, the first connecting portion 1421 is a flexible component.

[0109] Understandably, the first connecting part 1421 has a certain degree of flexibility and can deform under the action of external force.

[0110] In some embodiments, the first connecting part 1421 includes a carbon block and a conductive wire. The carbon block abuts against the rotating shaft 122, and the conductive wire is connected to the graphite block. The shaft current on the rotating shaft 122 is introduced to the ground through the carbon block and the conductive wire in sequence. Since the carbon block has good conductivity and wear resistance, the carbon block can stably contact the rotating shaft 122 and effectively conduct the shaft current of the rotating shaft 122 during high-speed friction.

[0111] Of course, in other embodiments, the first connecting part 1421 may also be a metal wire, a metal sheet, a metal strip, etc.

[0112] By adopting the above technical solution, the wear of the first connecting part 1421 during the rotation of the rotating shaft 122 is effectively reduced.

[0113] In some embodiments of this application, please refer to Figures 11 and 12 together. The outer casing 11 is electrically connected to the ground. The grounding conductive member 142 further includes a second connecting part 1422, which is connected to the outer casing 11. The first connecting part 1421 is connected to the second connecting part 1422, so that the grounding conductive member 142 is electrically connected to the outer casing 11.

[0114] The second connecting part 1422 is used to electrically connect the housing 11 to the first connecting part 1421. The shaft current on the rotating shaft 122 can be conducted to the housing 11 through the first connecting part 1421 and the second connecting part 1422 in sequence, and then introduced to the ground through the housing 11. The first connecting part 1421 can be directly connected to the second connecting part 1422, or it can be indirectly connected to the second connecting part 1422.

[0115] In some embodiments, the grounding conductive element 142 further includes a third connecting portion 1423, which is connected between the first connecting portion 1421 and the second connecting portion 1422. The first connecting portion 1421, the second connecting portion 1422, and the third connecting portion 1423 can be integrally formed components. For example, the first connecting portion 1421, the second connecting portion 1422, and the third connecting portion 1423 can be integrally formed using a die-casting process. The first connecting portion 1421, the second connecting portion 1422, and the third connecting portion 1423 can be formed separately and then connected into a whole.

[0116] By adopting the above technical solution, the structure of the motor 10 is effectively simplified so that the grounding conductive component 142 can be connected to the earth.

[0117] In some embodiments of this application, please refer to FIG12, the second connecting portion 1422 is pressed against the outer peripheral wall of the magnetic ring 141 and the outer shell 11.

[0118] In some embodiments, the second connecting portion 1422 has a sheet-like structure and fits against the outer peripheral wall of the magnetic ring 141. The mounting base 112 has a ring-like structure. During assembly, the magnetic ring 141 and the grounding conductive element 142 can be press-fitted onto the mounting base 112 as a whole, so that the second connecting portion 1422 is pressed against the outer peripheral wall of the magnetic ring 141 and the outer shell 11.

[0119] In some embodiments, the grounding conductive member 142 further includes a third connecting portion 1423. The magnetic ring 141 has a through hole that penetrates the outer peripheral wall and the inner peripheral wall of the magnetic ring 141. The second connecting portion 1422 is pressed against the outer peripheral wall of the magnetic ring 141 and the outer shell 11. The third connecting portion 1423 is disposed in the through hole. One end of the third connecting portion 1423 is connected to the first connecting portion 1421, and the other end of the third connecting portion 1423 is connected to the second connecting portion 1422.

[0120] By adopting the above technical solution, the structure of the motor 10 is further simplified so that the second connecting part 1422 can be connected to the housing 11.

[0121] In some embodiments of this application, please refer to Figures 4 to 6 together. The outer casing 11 is electrically connected to the ground, and the grounding conductive element 142 is electrically connected to the outer casing 11 through a magnetic ring 141.

[0122] In this embodiment, the magnetic ring 141 can be made of a material that has both good magnetic permeability and electrical conductivity, such as iron, cobalt, nickel, cobalt-iron alloy, iron-cobalt alloy, cobalt-nickel alloy, etc. The shaft current on the rotating shaft 122 can be conducted sequentially through the grounding conductive component 142 and the magnetic ring 141 to the outer casing 11, and then introduced into the ground through the outer casing 11.

[0123] By adopting the above technical solution, the structure of the motor 10 is effectively simplified so that the grounding conductive component 142 can be connected to the earth.

[0124] In some embodiments of this application, please refer to Figures 9, 10, 13 and 14 together. The anti-electro-erosion component 14 also includes an elastic element 143, which is disposed between the magnetic ring 141 and the grounding conductive element 142 so that the grounding conductive element 142 presses against the rotating shaft 122.

[0125] The elastic element 143 is a component used to provide an elastic force for the grounding conductive element 142 to press against the rotating shaft 122. Understandably, the elastic extension / retraction direction of the elastic element 143 is from the magnetic ring 141 towards the rotating shaft 122. The elastic extension / retraction direction of the elastic element 143 can be perpendicular to the central axis of the rotating shaft 122, or it can be inclined to the central axis of the rotating shaft 122. When the assembly operation of the anti-electro-erosion assembly 14 is completed, the elastic element 143 is in an elastically compressed state to continuously provide an elastic force for the grounding conductive element 142 to press against the rotating shaft 122.

[0126] In some embodiments, the elastic element 143 is a spring, with one end of the elastic element 143 abutting against the magnetic ring 141 and the other end of the elastic element 143 abutting against the grounded conductive element 142. Of course, in other embodiments, the elastic element 143 can also be a sheet, a rubber block, etc.

[0127] In some embodiments, referring to Figures 13 and 14 together, the outer casing 11 is electrically connected to the ground. The grounding conductive element 142 includes a first connecting portion 1421, a second connecting portion 1422, and a third connecting portion 1423. One end of the elastic element 143 abuts against the magnetic ring 141, and the other end of the elastic element 143 abuts against the first connecting portion 1421, so that the first connecting portion 1421 presses against the rotating shaft 122. The second connecting portion 1422 is connected to the outer casing 11, and the third connecting portion 1423 is connected between the first connecting portion 1421 and the second connecting portion 1422. As an example, in order for the first connecting portion 1421 to move towards the rotating shaft 122 under the elastic action of the elastic element 143, the third connecting portion 1423 can be a flexible element, which can be, but is not limited to, a conductive sheet, a conductive wire, a conductive strip, etc.

[0128] By adopting the above technical solution, the elastic element 143 can provide the grounding conductive element 142 with an elastic force for pressing against the rotating shaft 122, so that the grounding conductive element 142 can maintain contact with the rotating shaft 122, thereby reducing the risk of the grounding conductive element 142 separating from the rotating shaft 122 and further improving the working performance of the motor 10.

[0129] In some embodiments of this application, please refer to FIG10. The magnetic ring 141 has a mounting hole 1411 and the elastic element 143 is disposed in the mounting hole 1411.

[0130] In some embodiments, the mounting hole 1411 forms an opening through the inner peripheral wall of the magnetic ring 141, and the elastic member 143 is fitted into the mounting hole 1411 through the opening.

[0131] In some embodiments, at least a portion of the grounding conductive member 142 is inserted into the mounting hole 1411 via the opening. For example, one end of the first connecting portion 1421 of the grounding conductive member 142 away from the rotating shaft 122 is inserted into the mounting hole 1411 via the opening to abut against the elastic member 143.

[0132] By adopting the above technical solution, the internal structure of the motor 10 can be made more compact, thereby effectively reducing the size of the motor 10.

[0133] In some embodiments of this application, please refer to Figures 10 and 14 together. The magnetic ring 141 has a first limiting part 1412 at the port of the mounting hole 1411 facing the rotating shaft 122. The grounding conductive member 142 includes a second limiting part 1424 disposed in the mounting hole 1411. The second limiting part 1424 and the first limiting part 1412 are engaged.

[0134] In some embodiments, the first limiting portion 1412 protrudes from the wall of the mounting hole 1411. The grounding conductive member 142 further includes a first connecting portion 1421. One end of the first connecting portion 1421 away from the rotating shaft 122 is inserted into the mounting hole 1411. The second limiting portion 1424 is connected to the end of the first connecting portion 1421 away from the rotating shaft 122 and protrudes from the outer peripheral wall of the first connecting portion 1421. When the first limiting portion 1412 and the second limiting portion 1424 abut against each other, the first connecting portion 1421 cannot continue to move towards the rotating shaft 122 under the elastic action of the elastic member 143.

[0135] In some embodiments, the length direction of the mounting hole 1411 can be parallel to the elastic extension direction of the elastic member 143. The first limiting part 1412 has an annular structure and is arranged around the grounding conductive member 142. The inner peripheral wall of the first limiting part 1412 is in clearance fit with the grounding conductive member 142. The width of the gap between the inner peripheral wall of the first limiting part 1412 and the grounding conductive member 142 is only required to allow the grounding conductive member 142 to move towards the rotating shaft 122 under the elastic action of the elastic member 143. Specifically, it can be 0.01mm, 0.02mm, 0.03mm, 0.04mm, 0.05mm, 0.06mm, 0.07mm, 0.08mm, 0.09mm, 0.1mm, etc., to provide guidance for the movement of the grounding conductive member 142 and improve the stability of the movement of the grounding conductive member 142.

[0136] By adopting the above technical solution, the risk of the grounding conductive component 142 detaching from the magnetic ring 141 is effectively reduced, thereby further improving the working performance of the motor 10.

[0137] In some embodiments of this application, please refer to Figures 4 and 5 together. There are multiple grounding conductive elements 142, and the multiple grounding conductive elements 142 are distributed circumferentially along the rotating shaft 122.

[0138] In some embodiments, a plurality of grounding conductive elements 142 are evenly distributed along the circumference of the rotating shaft 122, that is, the spacing between each adjacent grounding conductive element 142 is equal in the circumference of the rotating shaft 122.

[0139] In some embodiments, the grounding conductive member 142 includes a first connecting portion 1421, which abuts against the outer peripheral wall of the rotating shaft 122 to form a contact. The cross-section of the outer peripheral wall of the rotating shaft 122 passing through the contact is inclined to the first connecting portion 1421. The first connecting portion 1421 of each grounding conductive member 142 is inclined to the central axis of the rotating shaft 122. The end of the first connecting portion 1421 of each grounding conductive member 142 near the rotating shaft 122 is on the same plane perpendicular to the central axis of the rotating shaft 122, and the end of the first connecting portion 1421 of each grounding conductive member 142 away from the rotating shaft 122 is on another plane perpendicular to the central axis of the rotating shaft 122.

[0140] In some other embodiments, the grounding conductive element 142 includes a first connecting portion 1421, which abuts against the outer peripheral wall of the rotating shaft 122 to form a contact. The tangent plane of the contact point to the outer peripheral wall of the rotating shaft 122 is inclined to the first connecting portion 1421. The first connecting portion 1421 of each grounding conductive element 142 is perpendicular to the central axis of the rotating shaft 122, and the first connecting portion 1421 of each grounding conductive element 142 is located on the same plane perpendicular to the central axis of the rotating shaft 122.

[0141] By adopting the above technical solution, the shaft current on the rotating shaft 122 can be introduced to the ground more effectively, further reducing the current flowing through the bearing 15, further reducing the risk of electrical erosion in the bearing 15, and thus further improving the working performance of the motor 10.

[0142] In some embodiments of this application, the magnetic ring 141 is coaxially arranged with the rotating shaft 122.

[0143] The coaxial arrangement of the magnetic ring 141 and the rotating shaft 122 means that the central axis of the magnetic ring 141 coincides with the central axis of the rotating shaft 122.

[0144] By adopting the above technical solution, not only can the magnetic ring 141 more effectively block or reduce the common-mode current on various coupling capacitors inside the motor 10, but the magnetic flux generated by the magnetic ring 141 under the action of the common-mode current can also be superimposed to form a stronger magnetic field, so as to further suppress the common-mode current on the rotating shaft 122, further reduce the current flowing through the bearing 15, further reduce the risk of the bearing 15 experiencing electrolytic corrosion, and thus further improve the working performance of the motor 10.

[0145] In some embodiments of this application, please refer to FIG5, the magnetic ring 141 is a circular ring.

[0146] In some embodiments, the rotating shaft 122 is a circular shaft, and the magnetic ring 141 is sleeved on the rotating shaft 122 and coaxially arranged with the rotating shaft 122.

[0147] By adopting the above technical solution, the magnetic flux generated by the magnetic ring 141 under the action of common mode current can be more effectively superimposed to form a stronger magnetic field, so as to further suppress the common mode current on the rotating shaft 122, further reduce the current flowing through the bearing 15, further reduce the risk of electrical erosion of the bearing 15, and thus further improve the working performance of the motor 10.

[0148] Secondly, referring to FIG3, this application provides an electric drive device 1, including the motor 10 described in any of the above embodiments.

[0149] The electric drive device 1 provided in this application embodiment effectively improves the working performance of the electric drive device 1 by adopting the motor 10 described in any of the above embodiments.

[0150] Thirdly, referring to Figure 1, this application embodiment provides an electric drive system, including a battery 2 and the aforementioned electric drive device 1, wherein the battery 2 is electrically connected to the motor 10.

[0151] The electric drive system provided in this application embodiment effectively improves the working performance of the electric drive system by adopting the above-mentioned electric drive device 1.

[0152] Fourthly, referring to Figure 1, this application embodiment provides an electric device, including the above-described electric drive device 1 or the above-described electric drive system.

[0153] The electric equipment provided in this application embodiment effectively improves the working performance of the electric equipment by adopting the above-mentioned electric drive device 1 or the above-mentioned electric drive system.

[0154] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. An electric machine characterized in that, The motor comprises: a housing having a cavity; a bearing mounted on the housing; a rotor rotatably mounted on the housing via the bearing, the rotor comprising a rotor body and a rotating shaft connected with the rotor body; a stator fixedly mounted in the cavity, the stator being magnetically coupled with the rotor body to drive the rotor to rotate; an anti-electric corrosion assembly mounted on the housing, the anti-electric corrosion assembly comprising a magnetic ring and a grounding conductive piece, the magnetic ring being sleeved on the rotating shaft, and the grounding conductive piece being mounted on the magnetic ring and electrically connected with the rotating shaft.

2. The electric machine of claim 1, wherein, The grounding conductive piece comprises a first connecting portion abutting against the rotating shaft to electrically connect the grounding conductive piece with the rotating shaft.

3. The electric machine of claim 2, wherein, The first connecting portion abuts against the peripheral wall of the rotating shaft to form a contact point, and the peripheral wall of the rotating shaft is obliquely arranged with respect to the first connecting portion at the contact point.

4. The electric machine of claim 3, wherein, An included angle α between the first connecting portion and the peripheral wall of the rotating shaft is 30°≤α<90°.

5. The electric machine of claim 2, wherein, The first connecting portion is a flexible piece.

6. The electric machine of claim 2, wherein, The housing is electrically connected with the ground, the grounding conductive piece further comprises a second connecting portion connected with the housing, and the first connecting portion is connected with the second connecting portion to electrically connect the grounding conductive piece with the housing.

7. The electric machine of claim 6, wherein, The second connecting portion is pressed between the peripheral wall of the magnetic ring and the housing.

8. The electric machine of any of claims 1-5, wherein, The housing is electrically connected with the ground, and the grounding conductive piece is electrically connected with the housing via the magnetic ring.

9. The electric machine of any of claims 1-8, wherein, The anti-electric corrosion assembly further comprises an elastic piece arranged between the magnetic ring and the grounding conductive piece to press the grounding conductive piece against the rotating shaft.

10. The electric machine of claim 9, wherein, The magnetic ring is provided with a mounting hole, and the elastic piece is arranged in the mounting hole.

11. The electric machine of claim 10, wherein, The magnetic ring is provided with a first limiting portion at a port of the mounting hole facing the rotating shaft, and the grounding conductive piece comprises a second limiting portion arranged in the mounting hole, the second limiting portion being snap-fitted with the first limiting portion.

12. The electric machine of any of claims 1-11, wherein, The housing comprises a shell, a cover and a mounting seat, the shell has the cavity, the cover is arranged on the shell to close the cavity, the mounting seat is connected with the shell or the cover, and the anti-electric corrosion assembly is mounted on the mounting seat.

13. The electric machine of any of claims 1-12, wherein, The number of the grounding conductive pieces is plural, and the plural grounding conductive pieces are distributed along the circumference of the rotating shaft.

14. The electric machine of any of claims 1-13, wherein, The magnetic ring is coaxially arranged with the rotating shaft.

15. The electric machine of claim 14, wherein, The magnetic ring is a circular ring.

16. An electric drive device, characterized by The electric drive device comprises the motor according to any one of claims 1-15.

17. An electric drive system, characterized by The electric drive system comprises a battery and the electric drive device according to claim 16, and the battery is electrically connected with the motor.

18. An electrically powered device, characterized by The electric device comprises the electric drive device according to claim 16 or the electric drive system according to claim 17.

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