Motor shaft voltage detection device, method and electric drive assembly

Abstract

The application provides a motor shaft voltage detection device, method and electric drive assembly, wherein the motor shaft voltage detection device comprises a sensor and a conductive part. The sensor and the conductive part are arranged in the interior of a casing respectively, the sensor is connected with a signal waveform display, outputs a shaft voltage signal of a rotating shaft, and sends the shaft voltage signal to the signal waveform display. An insulation structure is arranged between the conductive part and the casing, the output end of the conductive part protrudes from the insulation structure, penetrates through the casing and protrudes outside the casing. The output end of the conductive part is in a suspended state, the sensor outputs an original signal of the shaft voltage signal to the signal waveform display; the output end of the conductive part is in a grounded state, the sensor outputs a signal of the shaft voltage signal which takes a countermeasure against weakening of the shaft voltage signal to the signal waveform display.

Description

Technical Field

[0001] This invention relates to the field of motor testing technology, and in particular to a motor shaft voltage detection device, method, and electric drive assembly. Background Technology

[0002] When the shaft voltage is high or the oil film has not yet stabilized at the moment of motor start-up, the shaft voltage will cause the lubricating oil film to discharge and break down, forming a circuit and generating shaft current. The high temperature generated by the partial discharge energy release of the shaft current can melt many tiny areas on the inner ring, outer ring, or balls of the bearing, forming grooves, thereby generating noise and vibration.

[0003] There are several ways to reduce the shaft voltage of a motor rotor. One method is to weaken the shaft current signal by diverting current. This diversion method is implemented as follows: by disassembling the motor housing, installing a grounding ring between the rotor and the housing (used for grounding), and then grounding the housing through the grounding ring to divert the shaft current. The motor after this shaft current signal reduction measure can then be tested to obtain the improved shaft voltage.

[0004] When testing a motor after countermeasures to the undiminished shaft voltage signal are required, the rotor shaft voltage should be tested without using the aforementioned grounding ring.

[0005] Therefore, when comparing the test results of a motor after the reduction of shaft electrical signal with the test results of a motor without the reduction of shaft electrical signal, repeated disassembly and assembly are required, which increases the complexity and labor intensity of the test operation. Summary of the Invention

[0006] This application provides a motor shaft voltage detection device, method, and electric drive assembly. The test comparison does not require repeated disassembly and assembly, reducing the complexity and labor intensity of the test operation.

[0007] This application provides a motor shaft voltage detection device applied to an electric drive assembly. The electric drive assembly includes a motor, the motor including a housing and a rotor disposed within the housing, the rotor including a shaft and a bearing connected to the shaft. The motor shaft voltage detection device includes:

[0008] Sensors and conductive components are respectively disposed within the housing and connected to the rotating shaft, and are positioned close to the bearing; wherein, the sensor is used to connect to a signal waveform display, output the shaft electrical signal of the rotating shaft, and send the shaft electrical signal to the signal waveform display;

[0009] An insulating structure is provided between the conductive component and the housing;

[0010] The conductive element includes an output terminal that protrudes from the insulating structure, passes through the housing, and protrudes from the outside of the housing; when the output terminal of the conductive element is in a suspended state, the sensor outputs the original signal of the axial electrical signal to the signal waveform display; when the output terminal of the conductive element is in a grounded state, the sensor outputs a signal to the signal waveform display indicating that measures are taken to weaken the axial electrical signal.

[0011] Furthermore, the insulating structure includes an insulating shell;

[0012] The sensor and the conductive component are integrally formed and enclosed in the insulating shell, and the sensor and the conductive component are separate from each other. A connection port for the rotating shaft to pass through is formed between the sensor and the conductive component, and the sensor and the conductive component are respectively connected to the rotating shaft through the connection port.

[0013] Furthermore, the sensor is a first conductive element, and the conductive element is a second conductive element. The first conductive element and the second conductive element are separate from each other, and the first conductive element and the second conductive element are integrally formed on the insulating shell.

[0014] The sensor is externally connected to the signal waveform display via its signal output terminal;

[0015] The insulating shell has a first port for connecting the signal output terminal and a second port for connecting the output terminal of the conductive component. The signal output terminal and the output terminal of the conductive component pass through the housing and protrude from the outside of the housing.

[0016] The output terminal of the conductive element is in a floating state and is connected to the signal waveform display. The original signal is output to the signal waveform display. Alternatively, the output terminal of the conductive element is in a grounded state and is connected to the signal waveform display. The signal output terminal outputs the signal that takes measures to weaken the axial electrical signal to the signal waveform display.

[0017] Furthermore, the signal output terminal includes a first output wire, and the output terminal of the conductive element includes a second output wire. The first output wire and the second output wire include a conductive core and an insulating layer wrapped around the conductive core. The insulating layer of the first output wire is different from the insulating layer of the second output wire.

[0018] And / or,

[0019] The motor shaft voltage detection device includes an end cap near the conductive element. The end cap matches the housing. The housing and the end cap each include a shaped groove. The signal output terminal and the output terminal of the conductive element are respectively pressed and fixed to the shaped groove.

[0020] Furthermore, the first conductive element and the second conductive element are each in the form of a block structure, and the first conductive element and the second conductive element form the connection port;

[0021] The first conductive element includes a first non-closed annulus and a first non-closed opening, and a second non-closed annulus and a second non-closed opening that are opposite to the second conductive element. The first non-closed opening and the second non-closed opening are directly opposite each other and are spaced apart.

[0022] Furthermore, the first ring and the second ring are both circular rings, and the insulating shell is a circular ring block structure;

[0023] or,

[0024] The first ring and the second ring are respectively square on the outside and round on the inside, and the insulating shell is a block structure.

[0025] Furthermore, the area of ​​the radial cross-section of the first conductive element is less than or equal to the area of ​​the radial cross-section of the second conductive element.

[0026] And / or,

[0027] The first conductive element and the second conductive element are conductive rings, and the input end of the conductive ring includes a conductive brush, which is in contact with the rotating shaft and is located close to the bearing.

[0028] Furthermore, the insulating structure includes an insulating shell;

[0029] The sensor includes a signal output terminal, which is used to connect to an oscilloscope; the sensor is externally connected to the signal waveform display through the signal output terminal.

[0030] The conductive element is enclosed within the insulating shell, and the sensor is located outside the insulating shell. The output terminal of the conductive element is a single output terminal, which is in a floating state. The signal output terminal is connected to the signal waveform display, and the signal output terminal outputs the original signal to the signal waveform display. Alternatively, the output terminal of the conductive element can be grounded, and the signal output terminal is connected to the signal waveform display, outputting the signal for implementing the strategy of weakening the axial electrical signal to the signal waveform display.

[0031] Furthermore, the insulating structure is interference-fitted with the housing.

[0032] This application provides a method for detecting motor shaft voltage, applied to the motor shaft voltage detection device described in any of the above claims, the method comprising:

[0033] Determine the connection state of the output terminal of the conductive component so that at least a portion of the shaft voltage of the motor shaft forms a circulating current through the bearing, oil film and housing;

[0034] The sensor outputs the shaft electrical signal and sends the shaft electrical signal to the signal waveform display.

[0035] Furthermore, determining the connection state of the output terminal of the conductive component includes:

[0036] Determine that the output terminal of the conductive component is set to a floating state;

[0037] The sensor outputs an axial electrical signal of the rotating shaft and sends the axial electrical signal to the signal waveform display, including:

[0038] The sensor outputs the original signal of the shaft's electrical signal and sends the original signal to the signal waveform display.

[0039] Furthermore, determining the connection state of the output terminal of the conductive component includes:

[0040] It is determined that the output terminal of the conductive element is set to a grounded state;

[0041] The sensor outputs the raw signal of the shaft's electrical signal and sends the raw signal to the signal waveform display, including:

[0042] The sensor outputs a signal that takes measures to weaken the shaft electrical signal, and sends the signal to the signal waveform display.

[0043] This application provides an electric drive assembly, which includes a motor shaft voltage detection device as described in any of the preceding claims.

[0044] This application provides a new energy vehicle, including the electric drive assembly described above.

[0045] In some embodiments, the motor shaft voltage detection device of this application includes a sensor and a conductive element. The sensor and conductive element are respectively disposed inside the housing. The sensor is connected to a signal waveform display, outputting the shaft electrical signal and sending the shaft electrical signal to the signal waveform display. An insulating structure is provided between the conductive element and the housing. The output end of the conductive element protrudes from the insulating structure, passes through the housing, and protrudes from the outside of the housing. When the output end of the conductive element is in a suspended state, the sensor outputs the raw shaft electrical signal to the signal waveform display; when the output end of the conductive element is in a grounded state, the sensor outputs a signal to the signal waveform display indicating measures to weaken the shaft electrical signal. Thus, the output end of the conductive element, protruding from the insulating structure, passing through the housing, and protruding from the outside of the housing, can be in a suspended state or a grounded state. With the output terminal of the conductive component suspended, it is possible to test the motor without any measures to weaken the shaft electrical signal. With the output terminal of the conductive component grounded, it is possible to test the motor with measures to weaken the shaft electrical signal. This allows for a comparison between the tests of the motor with and without the measures to weaken the shaft electrical signal, eliminating the need for repeated disassembly and reassembly, and reducing the complexity and labor intensity of the testing operation. Attached Figure Description

[0046] Figure 1 The image shown is an axial view of the motor shaft voltage detection device provided in an embodiment of this application;

[0047] Figure 2 As shown Figure 1 The schematic cross-sectional view of the motor shaft voltage detection device shown;

[0048] Figure 3 As shown Figure 1 A plan view of the sensor and conductive components of the motor shaft voltage detection device shown;

[0049] Figure 4 As shown Figure 1 Axial view of the sensor and conductive components of the motor shaft voltage detection device shown;

[0050] Figure 5 As shown Figure 1 A first-view plan view of the sensor, conductive components, and insulation structure of the motor shaft voltage detection device shown.

[0051] Figure 6 As shown Figure 5 A second-view plan view of the sensor, conductive components, and insulating structure shown.

[0052] Figure 7 As shown Figure 6 The cross-sectional view of the sensor, conductive component, and insulation structure at point AA is shown.

[0053] Figure 8As shown Figure 5 Axial view of the sensor, conductive parts and insulation structure of the motor shaft voltage detection device shown;

[0054] Figure 9 As shown Figure 5 Axial view of the sensor, conductive parts and insulation structure of the motor shaft voltage detection device shown;

[0055] Figure 10 As shown Figure 5 A shaft view of another embodiment of the motor shaft voltage detection device shown;

[0056] Figure 11 As shown Figure 10 A partial schematic diagram of the end cover of the motor shaft voltage detection device shown;

[0057] Figure 12 The image shown is another axial view of the sensor, conductive component, and insulation structure of the motor shaft voltage detection device provided in an embodiment of this application.

[0058] Figure 13 The diagram shown is a flowchart of the shaft voltage detection method provided in an embodiment of this application. Detailed Implementation

[0059] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numerals in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with one or more embodiments of this specification. Rather, they are merely examples of apparatuses and methods consistent with some aspects of one or more embodiments of this specification as detailed in the appended claims.

[0060] It should be noted that the steps of the corresponding methods are not necessarily performed in the order shown and described in this specification in other embodiments. In some other embodiments, the methods may include more or fewer steps than described in this specification. Furthermore, a single step described in this specification may be broken down into multiple steps in other embodiments; and multiple steps described in this specification may be combined into a single step in other embodiments.

[0061] To address the aforementioned technical problem of requiring repeated disassembly and assembly, which increases the complexity and labor intensity of testing operations, this application provides a motor shaft voltage detection device, including a sensor and conductive components.

[0062] The system includes a sensor and a conductive component housed inside the casing. The sensor connects to a signal waveform display, outputting and transmitting the shaft's electrical signal. An insulating structure separates the conductive component from the casing. The output end of the conductive component protrudes from this insulating structure, passing through the casing and extending beyond its outer side. When the output end of the conductive component is suspended, the sensor outputs the raw shaft electrical signal to the signal waveform display. When the output end is grounded, the sensor outputs a signal to the signal waveform display indicating measures to weaken the shaft electrical signal.

[0063] In this embodiment, the output terminal of the conductive element protrudes from the insulating structure, passes through the housing, and protrudes from the outside of the housing. It can be in a suspended state or a grounded state. With the output terminal of the conductive element suspended, testing of the motor without shaft signal attenuation measures is possible. With the output terminal of the conductive element grounded, testing of the motor with shaft signal attenuation measures is possible. This allows for comparison between motor tests without and with attenuated shaft signal attenuation measures, eliminating the need for repeated disassembly and reassembly, thus reducing the complexity and labor intensity of the testing operation.

[0064] The motor shaft voltage detection device described in this application embodiment can be applied to, but is not limited to, electric drive assemblies. The electric drive assembly can include, but is not limited to, one or more of an oil-cooled motor and a reducer. For example, but not limited to, the oil-cooled motor can be a single-bearing oil-cooled motor, a double-bearing oil-cooled motor, or a three-bearing oil-cooled motor. Further examples will not be provided here.

[0065] Figure 1 The image shown is an axial view of the motor shaft voltage detection device provided in an embodiment of this application. Figure 2 As shown Figure 1 The diagram shows a schematic cross-sectional view of the motor shaft voltage detection device.

[0066] like Figure 1 and Figure 2 As shown, this application embodiment provides a motor shaft voltage detection device applied to an electric drive assembly 100. The electric drive assembly 100 includes a motor 110. The motor 110 includes a housing 111 and a rotor 112 disposed within the housing 111. The rotor 112 includes a rotating shaft 1121 and a bearing 1122 connected to the rotating shaft 1121. Thus, the rotor 112 is enclosed within the housing 111 outside the rotor 112, ensuring the safety of the rotor 112's rotation.

[0067] Continue as Figure 2As shown, the aforementioned motor shaft voltage detection device includes a sensor 200, a conductive element 300, and an insulating structure 400 between the conductive element 300 and the housing 111. The sensor 200 is used to connect to a signal waveform display, outputting the shaft electrical signal of the rotating shaft 1121 and sending the shaft electrical signal to the signal waveform display. The conductive element 300 is used to weaken the shaft electrical signal, serving as a signal for subsequent measurement of the shaft electrical signal to implement measures to weaken the shaft electrical signal. The insulating structure 400 is used to physically isolate the conductive element 300 from the housing 111, preventing the conductive element 300 from directly contacting the housing 111 and thus preventing electrical connection.

[0068] The aforementioned shaft electrical signals may include shaft voltage and shaft current. When the motor 110 is running, the potential difference generated between the two ends of the shaft 1121, or between the shaft 1121 and the bearing 1122, is called shaft voltage. If the two ends of the shaft 1121 form a circuit through the motor 110 frame, etc., then shaft current is generated under the action of the shaft voltage.

[0069] Specifically, shaft current is generated by the shaft voltage forming a closed circuit through the rotating shaft 1121, bearing 1122, stator frame, or auxiliary devices. Under normal circumstances, the shaft voltage is low, and the lubricating oil film in the bearing 1122 can act as insulation to suppress the generation of shaft current. However, when the shaft voltage is high, or when the oil film has not stabilized at the moment the motor 110 starts, the shaft voltage will cause the lubricating oil film to discharge and break down, forming a circuit and generating shaft current.

[0070] The sensor 200 and conductive element 300 are respectively disposed within the housing 111 and connected to the rotating shaft 1121, located near the bearing 1122. The sensor 200 is used to connect to a signal waveform display (not shown in the figure) to realize the external signal waveform display of the sensor 200 (not shown in the figure). Of course, the entire motor shaft voltage detection device may include a signal waveform display, or it may not include a signal waveform display; both are within the protection scope of this application embodiment. The sensor 200 is assembled near the bearing 1122 and contacts the rotating shaft 1121. The sensor 200 is externally connected to the signal waveform display to realize the testing of shaft electrical signals. The signal waveform display is used to display the shaft electrical signals. Exemplarily, the signal waveform display may be, but is not limited to, an oscilloscope, a spectrum analyzer, or a software module for displaying signal waveforms.

[0071] Next, the conductive element 300 includes an output terminal protruding from the insulating structure 400, passing through the housing 111, and protruding from the outside of the housing 111. The output terminal 330 of the aforementioned conductive element penetrates the housing 111 from inside the housing 111 and extends to the outside of the housing 111. This allows the output terminal to be controlled from the outside of the housing 111, for example, by having the output terminal floating (also known as ungrounded) or grounded.

[0072] The output terminal 330 of the aforementioned conductive component can be in the following two states:

[0073] 1) When the output terminal 330 of the aforementioned conductive component is in a floating state, the sensor 200 outputs the raw shaft electrical signal to the signal waveform display. The output terminal 330 of the conductive component in a floating state is used to reflect the detection state when the conductive component 300 is not grounded. At this time, the shaft electrical signal output by the sensor 200 to the signal waveform display is called the raw shaft electrical signal.

[0074] 2) When the output terminal 330 of the aforementioned conductive component is in a grounded state, the sensor 200 outputs a signal to the signal waveform display indicating a measure to weaken the axial electrical signal. The output terminal 330 of the conductive component in a grounded state is used to reflect the detection state when the conductive component 300 is grounded. At this time, the axial electrical signal output by the sensor 200 to the signal waveform display is called the signal indicating a measure to weaken the axial electrical signal.

[0075] The aforementioned measures to weaken shaft electrical signals may include measures to weaken shaft voltage or measures to weaken shaft current.

[0076] Furthermore, the aforementioned grounding state includes the output terminal 330 of the conductive element being grounded or the output terminal 330 of the conductive element being connected to the housing 111 to achieve grounding.

[0077] In this embodiment, the two motor test states are distinguished by whether the output terminal 330 of the conductive component is grounded or not. This allows for the comparison of testing a motor 110 of the electric drive assembly 100 after implementing measures to weaken the shaft electrical signal with testing a motor 110 without such measures, eliminating the need for repeated disassembly and reassembly, thus reducing the complexity and labor intensity of the testing operation. Furthermore, the absence of vulnerable parts during disassembly reduces the risk of rework, significantly improving efficiency and saving costs.

[0078] Continue as Figure 2 As shown, there are various connection structures between the insulation structure 400 and the housing 111: In some embodiments, the insulation structure 400 and the housing 111 are interference-fitted. This interference-fitted connection ensures a secure fixation between the insulation structure 400 and the housing 111, and since the insulation structure 400 is interference-fitted within the housing 111, they share space, resulting in a compact design that facilitates product miniaturization. In other embodiments, the insulation structure 400 and the housing 111 are in-situ connected. This avoids gaps between the insulation structure 400 and the housing 111, reducing the space occupied.

[0079] Figure 3 As shown Figure 1 The diagram shows a plan view of the sensor 200 and conductive component 300 of the motor shaft voltage detection device. Figure 4 As shown Figure 1 Axial view of the sensor 200 and conductive component 300 of the motor shaft voltage detection device shown. Figure 5 As shown Figure 1 The first-view plan view of the sensor 200, conductive element 300 and insulating structure 400 of the motor shaft voltage detection device shown. Figure 6 As shown Figure 5 The second-view plan view of the sensor 200, conductive element 300 and insulating structure 400 shown. Figure 7 As shown Figure 6 The cross-sectional view of sensor 200, conductive element 300 and insulating structure 400 at point AA is shown. Figure 8 As shown Figure 5 Axial view of the sensor 200, conductive element 300 and insulating structure 400 of the motor shaft voltage detection device shown.

[0080] like Figure 5 , Figure 6 and Figure 7 As shown, the insulating structure 400 includes an insulating shell 410. The insulating shell 410 is used to house the sensor 200 and the conductive component 300. The insulating shell 410 can be manufactured by injection molding or 3D printing followed by press-fitting.

[0081] Continue as Figure 3 , Figure 4 and Figure 8 As shown, the sensor 200 and the conductive element 300 are integrally formed and enclosed within the insulating shell 410, and the sensor 200 and the conductive element 300 are separate from each other. There is a gap between the sensor 200 and the conductive element 300; they are not connected and do not conduct electricity. A connection port 500 is formed between the sensor 200 and the conductive element 300 for the rotating shaft 1121 to pass through. The sensor 200 and the conductive element 300 are connected to the rotating shaft 1121 through the connection port 500.

[0082] In such Figures 3 to 8 In the illustrated embodiment, the sensor 200 and the conductive element 300 are integrally molded and enclosed within the insulating shell 410, and are not directly electrically connected to the housing 111. The conductivity can be controlled by adjusting the output terminal 330 of the conductive element to allow for connection or disconnection with the housing 111, making it convenient and controllable. Furthermore, the integral molding of the sensor 200 and the conductive element 300 within the insulating shell 410, along with the modular design, saves space. In other embodiments, the insulating structure 400 is an insulating layer.

[0083] continue Figures 3 to 8As shown, sensor 200 is the first conductive element 210, and conductive element 300 is the second conductive element 320. The first conductive element 210 and the second conductive element 320 are separate from each other, and the first conductive element 210 and the second conductive element 320 are integrally formed on the insulating shell 410.

[0084] continue Figure 8 As shown, sensor 200 is connected to an external signal waveform display via signal output terminal 220. This signal output terminal 220 is connected between sensor 200 and signal waveform display and is used to transmit the axial electrical signal of sensor 200.

[0085] continue Figure 3 As shown, the insulating shell 410 has a first port 420 for connecting the signal output terminal 220 and a second port 430 for connecting the output terminal 330 of the conductive component. The first port 420 serves as the connection port to the signal output terminal 220. The second port 430 serves as the connection port to the output terminal 330 of the conductive component. In some embodiments, the first port 420 and the second port 430 are respectively welding holes. The welding holes serve to avoid the signal output terminal 220 and the output terminal 330 of the conductive component, and facilitate welding. The signal output terminal 220 can be welded to the first port 420, and the output terminal 330 of the conductive component can be welded to the second port 430. In other embodiments, the first port 420 and the second port 430 are respectively adhesive holes. The signal output terminal 220 can be adhesively bonded to the first port 420, and the output terminal 330 of the conductive component can be adhesively bonded to the second port 430.

[0086] Combination Figure 1 and Figure 8 As shown, the signal output terminal 220 and the output terminal 330 of the conductive element pass through the housing 111 and protrude from the outside of the housing 111. The signal output terminal 220 and the output terminal 330 of the conductive element also protrude from the outside of the end cover 150. When the output terminal 330 of the conductive element is in a suspended state, the signal output terminal 220 is connected to a signal waveform display, and the signal output terminal 220 outputs the aforementioned original signal to the signal waveform display. When the output terminal 330 of the conductive element is in a grounded state, the signal output terminal 220 is connected to a signal waveform display, and the signal output terminal 220 outputs the aforementioned signal for weakening the axial electrical signal countermeasure to the signal waveform display.

[0087] In this embodiment, the signal output terminal 220 and the output terminal 330 of the conductive element, which are either suspended or grounded, extend from the same insulating shell 410 outside the housing 111 and are connected to the signal waveform display. This allows users to operate the signal output terminal 220 and the output terminal 330 of the conductive element from outside the housing 111 without disassembling the housing 111, thus improving testing efficiency. Furthermore, the modular design of the sensor 200, conductive element 300, insulating shell 410, and the signal output terminal 220 and the output terminal 330 of the conductive element facilitates modular manufacturing and use.

[0088] In some embodiments, the "first" in "first conductive element 210" and the "second" in "second conductive element 320" are used to distinguish between two conductive elements 300. The conductive element 300 may be, but is not limited to, a conductive ring or a conductive sheet. For example, the conductive ring is made of copper, and the conductive ring is made of aluminum.

[0089] The sensor 200 described above has several embodiments. In one embodiment, the sensor 200 can be a modified conductive ring sensor 200 used to detect shaft electrical signals. This sensor 200 is mounted near the bearing 1122, the first conductive brush 211 of the first conductive element 210 contacts the rotating shaft 1121, the housing 111 is insulated, and the shaft electrical signal is led out through the signal output terminal 220. The shaft electrical signal is then tested using an oscilloscope.

[0090] In other embodiments, the sensor 200 is a Hall current sensor or a Rokowski current sensor. Of course, other sensors used for shaft current detection are also within the protection scope of this application, and will not be listed here.

[0091] like Figure 5 and Figure 8 As shown, signal output terminal 220 includes a first output wire 2210. The output terminal 330 of the conductive component includes a second output wire 3310. The first output wire 2210 serves as a test wire for outputting shaft electrical signals. The second output wire 3310 serves as a ground wire for outputting grounded electrical signals. Thus, the two wires have different functions, which can be distinguished later.

[0092] The first output wire 2210 and the second output wire 3310 each include a wire core 2211 and an insulating layer wrapped around the wire core 2211. Exemplarily, the wire core 2211 may be, but is limited to, a copper core, an aluminum core, or a metal alloy. The aforementioned insulating layer serves to protect signal transmission and prevent harm to the human body. Exemplarily, the insulating layer is made of plastic or rubber. Simultaneously, the insulating layer serves as an identifier to distinguish the first output wire 2210 and the second output wire 3310. Various embodiments for distinguishing the first output wire 2210 and the second output wire 3310 are detailed below.

[0093] exist Figure 5 and Figure 8 In the illustrated embodiment, the insulation layer 2212 of the first output wire is different from the insulation layer 3312 of the second output wire. In some embodiments, the color of the insulation layer 2212 of the first output wire is different from the color of the insulation layer 3312 of the second output wire.

[0094] In other embodiments, the shape and pattern of the insulation layer 2212 of the first output conductor are different from the shape and pattern of the insulation layer 3312 of the second output conductor.

[0095] In some other embodiments, the shape of the insulation layer 2212 of the first output wire is different from the shape of the insulation layer 3312 of the second output wire.

[0096] Any method that can distinguish the insulation layer 2212 of the first output wire from the insulation layer 3312 of the second output wire is within the protection scope of the embodiments of this application, and will not be listed here.

[0097] continue Figure 3 and Figure 4 As shown, the first conductive element 210 and the second conductive element 320 are each a block structure, forming a connection port 500. The first conductive element 210 includes a first non-closed annulus and a first non-closed opening, and the second conductive element 320 has a second non-closed annulus and a second non-closed opening. The first non-closed opening and the second non-closed opening are directly opposite each other and spaced apart. This arrangement of the first conductive element 210 and the non-closed opening of the second conductive element 320 opposite each other to form the connection port 500, and the block structure of the first conductive element 210 and the second conductive element 320, facilitates the miniaturization of the structure.

[0098] Continue as Figures 3 to 8 As shown, the first and second rings are circular rings, and the insulating shell 410 is a circular block structure. This design of the insulating shell 410 matches the integrated structure of the sensor 200 and the conductive element 300, and achieves insulation of the housing 111 while occupying less space. In other embodiments, the first and second rings are respectively square on the outside and circular on the inside, and the insulating shell 410 is a square block structure.

[0099] In this configuration, the radial cross-sectional area of ​​the first conductive element 210 is less than or equal to the radial cross-sectional area of ​​the second conductive element 320. This arrangement ensures that the grounding conductive area of ​​the second conductive element 320 is greater than the axial electrical signal conductive area of ​​the first conductive element 210, thus better attenuating the axial electrical signal. For example, the second ring of the second conductive element 320 is greater than or equal to the first ring of the first conductive element 210. This configuration further attenuates the axial electrical signal and facilitates its acquisition.

[0100] In a first example of some applications, the first ring of the first conductive element 210 occupies 1 / 4, and the second ring of the second conductive element 320 occupies 3 / 4.

[0101] In a second example of some applications, the first ring of the first conductive element 210 occupies 1 / 5, and the second ring of the second conductive element 320 occupies 1 / 2.

[0102] Of course, the above is just an example. As long as the axial electrical signal can be collected through the first ring of the first conductive element 210, any way in which the second ring of the second conductive element 320 weakens the axial electrical signal is within the protection scope of the embodiments of this application, and is not limited here.

[0103] The aforementioned conductive element 300 includes an input end (not shown in the figure) that contacts the rotating shaft 1121. The input end is disposed in contact with the rotating shaft 1121 and close to the bearing 1122. The first conductive element 210 and the second conductive element 320 are conductive rings, and the input end of each conductive ring includes a conductive brush, which contacts the rotating shaft 1121 and is disposed close to the bearing 1122.

[0104] Continue as Figure 3 , Figure 4 and Figure 8 As shown, the first conductive element 210 is a first conductive ring, and the input end of the first conductive ring includes a first conductive brush 211. The first conductive brush 211 contacts the rotating shaft 1121 and is disposed near the bearing 1122.

[0105] The second conductive element 320 is a second conductive ring. The input end of the second conductive ring includes a second conductive brush 321, which contacts the rotating shaft 1121 and is positioned close to the bearing 1122. Thus, by internally mounting the sensor 200 and the conductive element 300 near the bearing 1122, and with the conductive brushes of both the sensor 200 and the conductive element 300 contacting the rotating shaft 1121, more data points can be collected, improving the accuracy of the test.

[0106] The terms "first" in "first conductive brush 211" and "second" in "second conductive brush 321" are used to distinguish between the two conductive brushes. The conductive brush may include a conductive fiber brush. For example, the conductive fiber brush is a carbon fiber brush. The motor rotor conducts the shaft electrical signal to the conductive ring via the carbon fiber brush through contact with the conductive ring. Subsequently, the second output wire is grounded to divert the shaft current.

[0107] The number of the aforementioned conductive brushes is greater than 1, and the number of the first conductive brush 211 and the second conductive brush 321 may be the same or different.

[0108] In some embodiments, the conductive brushes of the first conductive element 210 can be more densely packed than the conductive brushes of the second conductive element 320. The number of conductive brushes in the first conductive element 210 and the second conductive element 320 can be equal to the number of conductive brushes in a conventional conductive element. Of course, the conductive brushes of the second conductive element 320 can also be more densely packed than the conductive brushes of the first conductive element 210. The more conductive brushes there are, the more accurate the data acquisition, but the higher the setup cost. A balance between cost and data acquisition accuracy can be achieved selectively, and no limitation is made here.

[0109] In related technologies, the motors of new energy vehicles, including those with shafts or splines protruding from the outer side of the housing, are tested using rod-shaped probes. One end of the probe contacts the shaft, and the other end is connected to an oscilloscope probe. Another oscilloscope probe is clamped to the housing and grounded for testing. Since only one probe contacts the rotor, only one point is collected to determine the shaft voltage of the entire rotor. However, since two bearings in the rotor are connected in parallel, it is impossible to accurately detect the shaft voltage of the bearing branch.

[0110] In some application examples, the motor 110 in this embodiment may include one or more motors 110. "Multiple" means two or more. One motor 110 corresponds to one bearing 1122 or multiple bearings 1122, thus multiple motors 110 have multiple bearings 1122. In this embodiment, sensors 200 and conductive elements 300 of the aforementioned motor shaft voltage detection device can be respectively set at positions close to the shaft 1121 of each of the multiple bearings 1122 to test the shaft voltage of each branch of bearing 1122. Since the input terminal of each conductive element 300 includes a conductive brush, and the test points of the conductive brush are greater than one, compared to one probe per point, the conductive element 300 in this embodiment tests the shaft voltage of each branch of bearing 1122 more finely and accurately, enabling precise data testing, and making the test data more meaningful and valuable.

[0111] Figure 9 As shown Figure 5 Axial view of the sensor 200, conductive element 300 and insulating structure 400 of the motor shaft voltage detection device shown.

[0112] exist Figure 9 In the illustrated embodiment, the motor shaft voltage detection device includes an end cap 150 near the conductive element 300, which matches the housing 111. The housing 111 and the end cap 150 each include an end cap lead-out hole. The signal output terminal 220 and the output terminal 330 of the conductive element are respectively disposed within the end cap lead-out hole and fixed to the end cap lead-out hole. This improves the stability of the signal output terminal 220 and the output terminal 330 of the conductive element.

[0113] Continue as Figure 9 As shown, the signal output terminal 220 and the output terminal 330 of the conductive component are respectively matched with the lead-out holes of the end cover. In this way, the sealing performance of the signal output terminal 220, the output terminal 330 of the conductive component, and the housing 111 can be improved.

[0114] The lead-out hole 1501 of the signal output terminal can match the shape of the first output wire 2210 to improve sealing. The lead-out hole 1502 of the output terminal of the conductive component can match the shape of the second output wire 3310 to improve sealing. For example, the first output wire 2210 is a cylindrical wire, the lead-out hole 1501 of the signal output terminal can be circular, the second output wire 3310 is a cylindrical wire, and the output terminal 330 of the conductive component can be circular.

[0115] like Figure 1 As shown, combined with Figures 2 to 8 The assembly process is described below:

[0116] Sensor 200 is interference-fitted onto end cap 150, and the second conductive brush 321 of the second conductive element 320 contacts the rotating shaft 1121. The inner diameter of bearing 1122 is interference-fitted with the rotating shaft 1121, and the outer diameter of bearing 1122 is fitted with a small clearance in the bearing chamber of end cap 150. Sensor 200 is relatively close to bearing 1122. End cap 160 contacts and is bolted to housing 111. The first output wire 2210 and the second output wire 3310 are led out through end cap lead-out holes 1501 at the signal output end of end cap 150 and end cap lead-out holes 1502 at the output end of conductive element 150.

[0117] Figure 10 As shown Figure 5 A shaft view of another embodiment of the motor shaft voltage detection device shown. Figure 11 As shown Figure 10 A partial schematic diagram of the end cover 150 of the motor shaft voltage detection device shown.

[0118] Figure 10 and Figure 11 The embodiments are similar to Figures 1 to 9 The illustrated embodiment, compared to Figures 1 to 9 The illustrated embodiment, in Figure 10 and Figure 11 In this embodiment, the motor shaft voltage detection device includes an end cap 160 near the conductive element 300. The end cap 160 matches the housing 111. Both the housing 111 and the end cap 160 include irregularly shaped grooves 170. The signal output terminal 220 and the output terminal 330 of the conductive element are respectively pressed and fixed within the irregularly shaped grooves 170. Thus, by pressing the signal output terminal 220 and the output terminal 330 of the conductive element within the end cap 160 through the irregularly shaped grooves 170, the stability of the signal output terminal 220 and the output terminal 330 of the conductive element is improved.

[0119] For example, the first output wire 2210 is a cylindrical wire, and the end cap lead hole 1501 of the signal output terminal can be square. The second output wire 3310 is a cylindrical wire, and the output terminal 330 of the conductive component can be square, with the distance between opposite sides of the square being less than or equal to the outer diameter of the cylindrical wire. Thus, the first output wire 2210 and the second output wire 3310 are respectively crimped into the end cap lead hole, improving the stability and fixation of the connection between the first output wire 2210 and the second output wire 3310. Of course, other structures such as rhomboid grooves 170 are also within the protection scope of this application.

[0120] In other embodiments, the signal output terminal 220 and the output terminal 330 of the conductive element are secured within the end cover 160 by tightening a variable screw. Exemplarily, the variable screw may be, but is not limited to, a plastic screw. This allows for an interference fit between the signal output terminal 220 and the output terminal 330 of the conductive element and the end cover 160, increasing the strength of the connection.

[0121] Another embodiment of this application is similar to... Figures 1 to 9 The illustrated embodiment, compared to Figures 1 to 9 In another embodiment of this application, the insulation structure 400 includes an insulation shell 410.

[0122] The sensor 200 includes a signal output terminal 220 for connection to an oscilloscope; the sensor 200 is connected to an external signal waveform display via the signal output terminal 220.

[0123] The conductive element 300 is enclosed within the insulating shell 410, while the sensor 200 is located outside the insulating shell 410. The conductive element has an output terminal 330, which is in a floating state. The signal output terminal 220 is connected to a signal waveform display, outputting the original signal. Alternatively, the conductive element's output terminal 330 can be grounded, and the signal output terminal 220, also connected to the signal waveform display, outputs a signal that weakens the axial electrical signal. This configuration encloses the conductive element 300 within the insulating shell 410, with one output terminal protruding from the insulating structure 400, passing through the housing 111 and protruding beyond its outer side. Correspondingly, the end cap 150 has a port, minimizing structural changes, reducing modification costs, improving product adaptability, and simplifying the structure.

[0124] Figure 12 The image shown is another axial view of the sensor 200, conductive element 300, and insulating structure 400 of the motor shaft voltage detection device provided in this embodiment of the application.

[0125] Figure 12 The embodiments are similar to Figures 1 to 9 The illustrated embodiment, compared to Figures 1 to 9 The embodiments shown are as follows: Figure 12 In this embodiment, the insulating structure 400 may include an insulating block 630. The shorter wire 610 is the input terminal of the conductive element 300, which is injection-molded into the insulating block 630 and collects shaft electrical signals after contacting the rotating shaft 1121. The longer wire 620 is the output terminal 330 of the conductive element. The output terminal 330 of the conductive element is connected to the input terminal of the conductive element 300 inside the insulating block 630, and the conductive element 300 has an insulating layer on its exterior. Exemplarily, the insulating block 630 may be, but is not limited to, a cube.

[0126] Figure 13 The diagram shown is a flowchart illustrating the voltage detection method for the rotating shaft 1121 provided in an embodiment of this application.

[0127] Based on the same application concept as the aforementioned device, such as Figure 13 As shown, the shaft 1121 voltage detection method provided in this application embodiment is applied to the motor shaft voltage detection device as described above. The shaft 1121 voltage detection method includes the following steps 71 to 72:

[0128] Step 71: Determine the connection state of the output terminal 330 of the conductive component so that at least a portion of the shaft voltage of the motor 110's shaft 1121 forms a circulating current through the bearing 1122, the oil film, and the housing 111. Further, at least a portion of the shaft voltage of the motor 110's shaft 1121 forms a circulating current through the inner ring oil film of the bearing 1122 and the inner ring housing 111.

[0129] Step 72: Sensor 200 outputs the shaft electrical signal of rotating shaft 1121 and sends the shaft electrical signal to the signal waveform display.

[0130] In some embodiments, step 71 may further include, but is not limited to, forming an open circuit when it is determined that the output terminal 330 of the conductive element is set to a floating state, so that all the shaft voltage of the shaft 1121 of the motor 110 forms a circulating current through the inner ring oil film of the bearing 1122 and the inner ring housing 111.

[0131] In conjunction with step 71 above, step 72 above may further include, but is not limited to, the original signal of the shaft electrical signal of the output shaft 1121 of the sensor 200, and send the original signal to the signal waveform display.

[0132] In some other embodiments, step 71 may further include, but is not limited to, forming a path when it is determined that the output terminal 330 of the conductive element 300 is set to a ground state, so that at least a portion of the shaft voltage of the rotating shaft 1121 of the motor 110 forms a circulating current through the inner ring oil film and inner ring housing 111 of the bearing 1122, and the remaining portion of the shaft voltage other than the at least portion is conducted to the bearing 1122 for voltage division through the conductive element 300.

[0133] In conjunction with step 71 above, step 72 may further include, but is not limited to, taking a signal to weaken the shaft electrical signal of the shaft 1121 output by sensor 200, and sending the signal to weaken the shaft electrical signal to a signal waveform display.

[0134] For details on the implementation process of the corresponding steps in the above method, please refer to the implementation process of the functions and roles of each structure in the above device, which will not be repeated here.

[0135] In some embodiments, an electric drive assembly 100 is also provided, which includes a motor shaft voltage detection device as described above.

[0136] In some embodiments, a new energy vehicle is also provided, including the motor shaft voltage detection device or electric drive assembly 100 as described above.

[0137] The above are merely preferred embodiments of this specification and are not intended to limit this specification. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this specification shall be included within the scope of protection of this specification.

[0138] It should also be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus. Without further limitations, an element qualified by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

Claims

1. A motor shaft voltage detection device, characterized in that, An electric drive assembly, comprising a motor, the motor including a housing and a rotor disposed within the housing, the rotor including a shaft and a bearing connected to the shaft, the motor shaft voltage detection device comprising: Sensors and conductive components are respectively disposed within the housing and connected to the rotating shaft, and are positioned close to the bearing; wherein, the sensor is used to connect to a signal waveform display, output the shaft electrical signal of the rotating shaft, and send the shaft electrical signal to the signal waveform display; An insulating structure is provided between the conductive component and the housing; The conductive element includes an output terminal that protrudes from the insulating structure, passes through the housing, and protrudes from the outside of the housing; when the output terminal of the conductive element is in a suspended state, the sensor outputs the original signal of the axial electrical signal to the signal waveform display; when the output terminal of the conductive element is in a grounded state, the sensor outputs a signal to the signal waveform display indicating that measures are taken to weaken the axial electrical signal.

2. The motor shaft voltage detection apparatus of claim 1, wherein The insulating structure includes an insulating shell; The sensor and the conductive component are integrally formed and enclosed in the insulating shell, and the sensor and the conductive component are separate from each other. A connection port for the rotating shaft to pass through is formed between the sensor and the conductive component, and the sensor and the conductive component are respectively connected to the rotating shaft through the connection port.

3. The motor shaft voltage detection apparatus of claim 2, wherein The sensor is a first conductive element, and the conductive element is a second conductive element. The first conductive element and the second conductive element are separate from each other, and the first conductive element and the second conductive element are integrally formed on the insulating shell. The sensor is externally connected to the signal waveform display via its signal output terminal; The insulating shell has a first port for connecting the signal output terminal and a second port for connecting the output terminal of the conductive component. The signal output terminal and the output terminal of the conductive component pass through the housing and protrude from the outside of the housing. The output terminal of the conductive element is in a floating state and is connected to the signal waveform display. The original signal is output to the signal waveform display. Alternatively, the output terminal of the conductive element is in a grounded state and is connected to the signal waveform display. The signal output terminal outputs the signal that takes measures to weaken the axial electrical signal to the signal waveform display.

4. The motor shaft voltage detection apparatus of claim 3, wherein The signal output terminal includes a first output wire, and the output terminal of the conductive element includes a second output wire. The first output wire and the second output wire include a conductive core and an insulating layer wrapped around the conductive core. The insulating layer of the first output wire is different from the insulating layer of the second output wire. And / or, The motor shaft voltage detection device includes an end cap near the conductive element. The end cap matches the housing. The housing and the end cap each include a shaped groove. The signal output terminal and the output terminal of the conductive element are respectively pressed and fixed to the shaped groove.

5. The motor shaft voltage detection apparatus of claim 3, wherein The first conductive element and the second conductive element are each in the form of a block structure, and the first conductive element and the second conductive element form the connection port; The first conductive element includes a first non-closed annulus and a first non-closed opening, and a second non-closed annulus and a second non-closed opening that are opposite to the second conductive element. The first non-closed opening and the second non-closed opening are directly opposite each other and are spaced apart.

6. The motor shaft voltage detection apparatus of claim 5, wherein The first ring and the second ring are both circular rings, and the insulating shell is a circular ring block structure; or, The first ring and the second ring are respectively square on the outside and round on the inside, and the insulating shell is a block structure.

7. The motor shaft voltage detection apparatus of claim 5, wherein The area of ​​the radial cross-section of the first conductive element is less than or equal to the area of ​​the radial cross-section of the second conductive element; And / or, The first conductive element and the second conductive element are conductive rings, and the input end of the conductive ring includes a conductive brush, which is in contact with the rotating shaft and is located close to the bearing.

8. The motor shaft voltage detection apparatus of claim 1, wherein The insulating structure includes an insulating shell; The sensor includes a signal output terminal, which is used to connect to an oscilloscope; the sensor is externally connected to the signal waveform display through the signal output terminal. The conductive element is enclosed within the insulating shell, and the sensor is located outside the insulating shell. The output terminal of the conductive element is a single output terminal, which is in a floating state. The signal output terminal is connected to the signal waveform display, and the signal output terminal outputs the original signal to the signal waveform display. Alternatively, the output terminal of the conductive element can be grounded, and the signal output terminal is connected to the signal waveform display, outputting the signal for implementing the strategy of weakening the axial electrical signal to the signal waveform display.

9. The motor shaft voltage detection apparatus of claim 1 or 8, wherein The insulating structure is interference-fitted to the housing.

10. A method of detecting motor shaft voltage, the method comprising: The motor shaft voltage detection method, applied to the motor shaft voltage detection device as described in any one of claims 1 to 9, comprises: Determine the connection state of the output terminal of the conductive component so that at least a portion of the shaft voltage of the motor shaft forms a circulating current through the bearing, oil film and housing; The sensor outputs the shaft electrical signal and sends the shaft electrical signal to the signal waveform display.

11. The motor shaft voltage detection method of claim 10, wherein, The determination of the connection state of the output terminal of the conductive component includes: Determine that the output terminal of the conductive component is set to a floating state; The sensor outputs an axial electrical signal of the rotating shaft and sends the axial electrical signal to the signal waveform display, including: The sensor outputs the original signal of the shaft's electrical signal and sends the original signal to the signal waveform display.

12. The motor shaft voltage detection method of claim 10, wherein, The determination of the connection state of the output terminal of the conductive component includes: It was determined that the output terminal of the conductive component was set to a grounded state; The sensor outputs the raw signal of the shaft's electrical signal and sends the raw signal to the signal waveform display, including: The sensor outputs a signal that takes measures to weaken the shaft electrical signal, and sends the signal to the signal waveform display.

13. An electric drive assembly, comprising: The electric drive assembly includes a motor shaft voltage detection device as described in any one of claims 1 to 9.

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