Conductive structure and electric machine

Abstract

The application discloses a conductive structure and a motor. The conductive structure comprises a shell, a motor shaft and a conductive part. The motor shaft is rotatably installed in the shell through a motor bearing. The conductive part is arranged between the shell and the motor shaft. The conductive part is connected with the motor shaft and / or the shell through a conductive bearing, so as to electrically conduct the shell and the motor shaft. By arranging the conductive part and the conductive bearing, the electric charge on the motor shaft can be guided to the shell through the conductive part and the conductive bearing, so that the electric charge is prevented from flowing to the shell through the motor bearing, and the motor bearing is protected. In addition, the motor shaft and the shell are isolated, so that the torque of the motor shaft is prevented from being transmitted to the shell, and the rotation of the motor shaft is not affected.

Description

Technical Field

[0001] This invention relates to the field of motor corrosion technology, and in particular to a conductive structure and a motor. Background Technology

[0002] With the development of new energy vehicles, the general water-cooled motor solution is increasingly unable to meet the heat dissipation requirements of the vehicle's electric drive system. Oil-cooled motors are being used by more and more OEMs. As motor speeds increase and service life is required to be longer, the problem of electrical corrosion of motor bearings is becoming increasingly prominent. Due to the potential difference between the motor shaft and the housing, current flows from the motor shaft through the motor bearing to the housing, causing electrical corrosion of the bearing, which in turn leads to abnormal noise from the motor bearing and reduces the service life of the motor bearing. Summary of the Invention

[0003] The main objective of this invention is to propose a conductive structure and motor that aims to solve the problem of current flowing from the motor shaft to the housing through the motor bearing, thereby causing electro-corrosion of the motor bearing.

[0004] To achieve the above objectives, the present invention proposes a conductive structure comprising:

[0005] case;

[0006] The motor shaft is rotatably mounted within the housing via motor bearings; and,

[0007] A conductive part is disposed between the housing and the motor shaft. The conductive part is connected to the motor shaft and / or the housing through a conductive bearing to electrically conduct electricity between the housing and the motor shaft.

[0008] Optionally, the conductive part includes a conductive sleeve for supplying coolant to the motor shaft.

[0009] Optionally, the motor shaft is provided with a mounting hole extending along its axial direction;

[0010] The conductive sleeve passes through the mounting hole in the middle and is connected to the housing at both ends.

[0011] Optionally, the conductive bearing is disposed between the motor shaft and the conductive sleeve to form a cooling channel passing through the motor bearing outside the conductive sleeve;

[0012] The conductive sleeve is provided with an outlet that connects to the cooling channel.

[0013] Optionally, the liquid outlet is located at the end of the conductive sleeve away from its liquid inlet.

[0014] Optionally, a sealing ring is provided between the conductive sleeve and the motor shaft, and the sealing ring is located on the right side of the liquid outlet.

[0015] Optionally, the liquid outlet is located in the middle of the conductive sleeve.

[0016] Optionally, the two ends of the conductive sleeve are installed in the housing by interference fit.

[0017] Optionally, the motor shaft is provided with a mounting groove at one end corresponding to the conductive part;

[0018] The conductive bearing is disposed in the mounting groove.

[0019] In addition, the present invention also provides an electric motor, the electric motor including the above-described conductive structure.

[0020] In the technical solution of this invention, by providing the conductive part, the charge on the motor shaft is guided to the housing, so that the potential between the motor shaft and the housing is equal, preventing the charge from flowing to the housing through the motor bearing, which helps to prevent the motor bearing from being corroded. At the same time, by providing the conductive bearing, on the one hand, the charge on the motor shaft can be guided to the conductive part, and on the other hand, the motor shaft can be isolated from the housing to avoid affecting the rotation of the motor shaft. Thus, by providing the conductive part and the conductive bearing, the charge on the motor shaft can be guided to the housing through the conductive part and the conductive bearing, preventing the charge from flowing to the housing through the motor bearing, which helps to protect the motor bearing, and the motor shaft can be isolated from the housing to prevent the torque of the motor shaft from being transmitted to the housing, thus avoiding affecting the rotation of the motor shaft. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, 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 the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0022] Figure 1 A schematic diagram of an embodiment of the conductive structure provided by the present invention.

[0023] Explanation of icon numbers:

[0024]

[0025]

[0026] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0027] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0028] It should be noted that if the embodiments of the present invention involve directional indication, the directional indication is only used to explain the relative positional relationship and movement of the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0029] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. If the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0030] With the development of new energy vehicles, the general water-cooled motor solution is increasingly unable to meet the heat dissipation requirements of the vehicle's electric drive system. Oil-cooled motors are being used by more and more OEMs. As motor speeds increase and service life is required to be longer, the problem of electrical corrosion of motor bearings is becoming increasingly prominent. Due to the potential difference between the motor shaft and the housing, current flows from the motor shaft through the motor bearing to the housing, causing electrical corrosion of the bearing, which in turn leads to abnormal noise from the motor bearing and reduces the service life of the motor bearing.

[0031] In view of this, the present invention provides a conductive structure aimed at solving the problem that current from the motor shaft flows through the motor bearing to the housing, causing electro-corrosion of the motor bearing. Wherein, Figure 1 A schematic diagram of an embodiment of the conductive structure provided by the present invention.

[0032] Please see Figure 1 The conductive structure 100 includes a housing 1, a motor shaft, and a conductive part 4. The motor shaft is rotatably mounted in the housing 1 via a motor bearing 3. The conductive part 4 is disposed between the housing 1 and the motor shaft. The conductive part 4 is connected to the motor shaft 2 and / or the housing 1 via a conductive bearing 5 to electrically conduct electricity between the housing 1 and the motor shaft 2.

[0033] In the technical solution of the present invention, by providing the conductive part 4, the charge on the motor shaft 2 is guided to the housing 1, so that the potential between the motor shaft 2 and the housing 1 is equal, thus preventing the charge from flowing to the housing 1 through the motor bearing 3, which helps to prevent the motor bearing 3 from being corroded. At the same time, by providing the conductive bearing 5, on the one hand, the charge on the motor shaft 2 can be guided to the conductive part 4, and on the other hand, the motor shaft 2 can be isolated from the housing 1 to avoid affecting the rotation of the motor shaft 2. Thus, by providing the conductive part 4 and the conductive bearing 5, the charge on the motor shaft 2 can be guided to the housing 1 through the conductive part 4 and the conductive bearing 5, preventing the charge from flowing to the housing 1 through the motor bearing 3, which helps to protect the motor bearing 3, and the motor shaft 2 can be isolated from the housing 1 to prevent the torque of the motor shaft 2 from being transmitted to the housing 1, thus avoiding affecting the rotation of the motor shaft 2.

[0034] It should be noted that the conductive bearing 5 is only used to isolate the housing 1 from the motor shaft 2 to prevent the torque of the motor shaft 2 from being transmitted to the housing 1. Compared with the motor bearing 3, its requirements are lower, which makes its manufacturing cost lower.

[0035] It is understood that, in order to drive the motor shaft 2 to rotate, the conductive structure 100 also includes a stator 7 and a rotor 8 disposed in the housing 1, the stator 7 being fixedly connected to the housing 1, and the rotor 8 being fixedly connected to the motor shaft 2.

[0036] Furthermore, the conductive part 4 can be of various types, such as a conductive post or a conductive sleeve. The present invention does not limit the type of conductive part 4. Specifically, in this embodiment, the conductive part 4 includes a conductive sleeve for supplying coolant to the motor shaft 2. Thus, by providing the conductive sleeve, it can both supply coolant to the motor shaft 2 and guide the charge of the motor shaft 2 to the housing 1.

[0037] In order to connect the conductive sleeve to the motor shaft 2, specifically, in one embodiment, the motor shaft 2 is provided with a mounting hole 31 extending along its axial direction. The middle part of the conductive sleeve passes through the mounting hole 31, and both ends are connected to the housing 1. In this way, by providing the mounting hole 31, the conductive sleeve can be inserted into the motor shaft 2 to connect both ends of the motor shaft 2 to the conductive sleeve. This facilitates the guidance of the charge at both ends of the conductive sleeve to the housing 1, and also allows for the simultaneous cooling of both ends of the motor shaft 2.

[0038] In another embodiment, the motor shaft 2 has a mounting groove at one end corresponding to the conductive part 4, and the conductive bearing 5 is disposed in the mounting groove. Thus, by providing the mounting groove, the conductive sleeve is installed on the motor shaft 2, thereby electrically connecting one end of the motor shaft 2 to the conductive sleeve. Further, the conductive part 4, the conductive bearing 5, and the mounting groove are respectively configured as conductive groups, with two conductive groups provided, each corresponding to one end of the motor shaft 2.

[0039] The conductive bearing 5 can be positioned in various ways. It can be positioned between the conductive sleeve and the housing 1, or between the conductive sleeve and the motor shaft 2. This invention does not limit the position of the conductive bearing 5. Specifically, in this embodiment, the conductive bearing 5 is positioned between the motor shaft 2 and the conductive sleeve to form a cooling channel passing through the motor bearing 3 outside the conductive sleeve. The conductive sleeve has an outlet 42 that connects to the cooling channel. Thus, by positioning the conductive bearing 5 between the motor shaft 2 and the conductive sleeve, a cooling channel is formed between the conductive sleeve and the motor shaft 2 to cool the motor bearing 3.

[0040] In order to ensure that the coolant can adequately cool the motor shaft 2, in this embodiment, the outlet 42 is located at the end of the conductive sleeve away from its inlet 41, so as to increase the flow path of the coolant and prolong the residence time of the coolant in the conductive sleeve, so that the coolant can fully exchange heat with the conductive sleeve.

[0041] The coolant outside the conductive sleeve can flow out from both ends of the motor shaft 2 or from one end of the motor shaft 2. The present invention does not limit this. Specifically, in this embodiment, a sealing ring 6 is provided between the conductive sleeve and the motor shaft 2. The sealing ring 6 is located on the right side of the outlet 42. In this way, the coolant can flow back outside the conductive sleeve, which can increase the residence time of the coolant in the cooling channel, so that the coolant can fully absorb the heat of the motor shaft 2, thereby helping to save coolant. It can also reduce the outflow path of the coolant, avoiding the need to set two outflow paths at both ends of the motor shaft 2, thereby helping to simplify the structure of the housing 1.

[0042] To improve the cooling effect of the coolant, in this embodiment, the outlet 42 is located in the middle of the conductive sleeve. This allows the coolant to enter the cooling channel from the middle of the conductive sleeve, flow through both ends of the motor shaft 2 and the two motor bearings 3, and then flow out. This allows for rapid injection of coolant into the motor shaft 2, reducing the coolant's residence time and maintaining a large temperature difference between the coolant and the motor shaft 2, thereby ensuring that the coolant can adequately cool the motor shaft 2.

[0043] To connect the conductive sleeve to the housing 1, specifically in this embodiment, both ends of the conductive sleeve are installed to the housing 1 via an interference fit to fix both ends of the conductive sleeve to the housing 1, preventing relative movement between the conductive sleeve and the housing 1, thereby sealing the conductive sleeve to the housing 1. Of course, in other embodiments, the conductive sleeve can also be installed to the housing 1 via a conductive bearing 5.

[0044] Furthermore, to achieve the above objectives, the present invention also provides an electric motor, which includes the aforementioned conductive structure 100. It should be noted that the structure of the conductive structure 100 in the electric motor can be referred to in the embodiments of the conductive structure 100 described above, and will not be repeated here. Since the conductive structure 100 is used in the electric motor provided by the present invention, the embodiments of the electric motor provided by the present invention include all the technical solutions of all embodiments of the conductive structure 100, and the achieved technical effects are completely the same, and will not be repeated here.

[0045] The above description is only a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformations made under the concept of the present invention using the description and drawings of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A conductive structure, characterized in that, include: case; The motor shaft is rotatably mounted inside the housing via motor bearings; as well as, A conductive part is disposed between the housing and the motor shaft. The conductive part is connected to the motor shaft and / or the housing through a conductive bearing to electrically conduct electricity between the housing and the motor shaft. The conductive part includes a conductive sleeve for supplying coolant to the motor shaft; The motor shaft is provided with a mounting hole extending along its axial direction. The conductive sleeve passes through the mounting hole in the middle and is connected to the housing at both ends; The conductive bearing is disposed between the motor shaft and the conductive sleeve to form a cooling channel passing through the motor bearing outside the conductive sleeve; The conductive sleeve is provided with a liquid outlet that connects to the cooling channel; The conductive structure also includes a stator and a rotor disposed within the housing, the stator being fixedly connected to the housing and the rotor being fixedly connected to the motor shaft.

2. The conductive structure as described in claim 1, characterized in that, The liquid outlet is located at the end of the conductive sleeve away from its liquid inlet.

3. The conductive structure as described in claim 2, characterized in that, A sealing ring is provided between the conductive sleeve and the motor shaft, and the sealing ring is located on the right side of the liquid outlet.

4. The conductive structure as described in claim 1, characterized in that, The liquid outlet is located in the middle of the conductive sleeve.

5. The conductive structure as described in claim 1, characterized in that, The two ends of the conductive sleeve are installed in the housing by interference fit.

6. The conductive structure as described in claim 1, characterized in that, The motor shaft is provided with a mounting groove at one end corresponding to the conductive part; The conductive bearing is disposed in the mounting groove.

7. An electric motor, characterized in that, Includes the conductive structure as described in any one of claims 1 to 5.

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