Electromagnetic shielding structure of motor shaft system component and test equipment

Abstract

The invention discloses an electromagnetic shielding structure of a motor shaft system component and test equipment. The electromagnetic shielding structure comprises a motor, an output shaft of the motor is connected with an insulating shaft, the insulating shaft is connected with a connecting shaft through a coupler, the connecting shaft is sleeved with a rotating hub, and the motor drives the rotating hub to rotate through the insulating shaft, the coupler and the connecting shaft; a first shielding case covers the motor, a second shielding case covers the output shaft of the motor, a third shielding case covers the insulating shaft and the coupling, and the first shielding case, the second shielding case and the third shielding case are connected to form a shielding layer and cover the whole motor shaft system part so as to prevent electromagnetic noise generated by the motor from being emitted outwards. The electromagnetic noise shielding device can perform comprehensive electromagnetic noise shielding processing on the whole motor and related rotating parts, can completely shield electromagnetic noise emitted by a motor shaft system part, and effectively prevents the electromagnetic noise from leaking outwards through any possible way, so that the test precision and reliability of EMC test equipment are remarkably improved.

Description

Technical Field

[0001] The invention relates to an electromagnetic shielding structure and testing equipment for a motor shaft system component, belonging to the technical field of vehicle testing. Background Art

[0002] In recent years, with the rapid development of new energy and driverless car technologies, the market demand for dynamometers that support electromagnetic compatibility (EMC) performance testing has increased, and the requirements for reducing the residual electromagnetic noise leaked from the dynamometer itself into the laboratory have also become increasingly higher.

[0003] The main motor, which is the power source of the dynamometer, is the main source of electromagnetic noise. Therefore, it is particularly important to effectively shield the main motor shaft system components. However, as a rotating component, the main motor shaft system is difficult to achieve comprehensive electromagnetic shielding due to its complex mechanical structure. The existing technology mostly adopts a simple way of wrapping the main motor, which can only shield electromagnetic noise in some specific bands. There must be a certain gap between the rotating main shaft output by the main motor and the fixed shielding cover, resulting in residual electromagnetic noise leaking into the laboratory space along the gap and the main shaft, thereby affecting the accuracy and reliability of the EMC dynamometer. Summary of the invention

[0004] To solve the above problems, the present invention provides an electromagnetic shielding structure and test equipment for motor shaft system components, which can perform comprehensive electromagnetic noise shielding treatment on the entire motor and its associated rotating parts, and completely shield all bands of electromagnetic noise that affect the test performance of the equipment. It can completely shield the electromagnetic noise emitted by the motor shaft system components, and ensure that the electromagnetic noise generated by the motor shaft system components is completely blocked inside the shielding cover, effectively preventing the electromagnetic noise from leaking outward through any possible channels, thereby greatly improving the accuracy of the EMC test equipment during the test process and ensuring the reliability of the test results.

[0005] Specifically, the technical solution of the present invention is as follows:

[0006] On the one hand, the present invention provides an electromagnetic shielding structure of a motor shaft system component, comprising a motor, wherein the output shaft of the motor is connected to an insulating shaft, the insulating shaft is connected to a connecting shaft through a coupling, a hub is provided outside the connecting shaft, and the motor drives the hub to rotate through the insulating shaft, the coupling and the connecting shaft; the motor outer cover is provided with a first shielding cover, the output shaft outer cover of the motor is provided with a second shielding cover, the insulating shaft and the coupling outer cover are provided with a third shielding cover, the first shielding cover, the second shielding cover and the third shielding cover are connected to form a shielding layer and cover the entire motor shaft system component to block the electromagnetic noise generated by the motor from being emitted outward.

[0007] In one embodiment of the present invention, the insulating shaft is connected between the output shaft of the motor and the coupling to cut off the conduction of residual shaft current between the motor and the connecting shaft to block the electromagnetic noise emitted outward by the coupling.

[0008] In one embodiment of the present invention, the insulating shaft is made of insulating material.

[0009] In one embodiment of the present invention, the third shielding cover is disposed on the outer periphery of the rotatable coupling and has a gap with the coupling, and a first carbon brush is disposed in the gap between the third shielding cover and the coupling.

[0010] In one embodiment of the present invention, the first carbon brush is arranged in a ring shape in the gap between the third shielding cover and the coupling, and forms a shielding wall to block the residual electromagnetic noise emitted outward through the gap between the third shielding cover and the coupling.

[0011] In one embodiment of the present invention, a second carbon brush is arranged between the encoder arranged at the tail of the motor and the housing of the motor, and the second carbon brush is used to drain the residual shaft current of the encoder at the tail of the motor to the housing of the motor to block the electromagnetic noise emitted outward from the encoder end.

[0012] In one embodiment of the present invention, the second carbon brush and the housing of the motor are located in the first shielding cover.

[0013] In one embodiment of the present invention, the output shaft of the motor is fixedly connected to the insulating shaft, one end of the insulating shaft away from the output shaft of the motor is fixedly connected to the coupling, the coupling is fixedly connected to the connecting shaft, and the rotating hub is sleeved outside the connecting shaft and fixedly connected to the connecting shaft.

[0014] In one embodiment of the present invention, the output shaft, insulating shaft, coupling, connecting shaft and rotating hub of the motor are coaxial.

[0015] On the other hand, the present invention further provides a testing device, comprising the electromagnetic shielding structure and a frame, wherein the electromagnetic shielding structure is installed on the frame.

[0016] Beneficial effects of the present invention:

[0017] The electromagnetic shielding structure and test equipment of a motor shaft system component provided by the present invention, through the first shielding cover, the second shielding cover and the third shielding cover connected to form a shielding layer, the entire motor shaft system component is covered, and the electromagnetic noise generated by the motor is blocked from being emitted outward, and the entire motor and its associated rotating parts can be subjected to comprehensive electromagnetic noise shielding treatment, and all bands of electromagnetic noise that affect the test performance of the equipment are completely shielded, and the electromagnetic noise generated by the motor shaft system components is effectively blocked, thereby significantly improving the test accuracy and reliability of the EMC test equipment. In addition, the electromagnetic shielding structure is provided with an insulating shaft between the output shaft of the motor and the coupling, and the conduction path of the residual shaft current between the motor and the connecting shaft or the rotating hub is cut off by the insulating shaft, thereby being able to attenuate, weaken and block the electromagnetic noise emitted outward by the coupling, and prevent the residual electromagnetic noise from leaking into the laboratory space along the rotating parts associated with the motor. Since the electromagnetic shielding structure only has a gap between the rotating coupling and the fixed third shielding cover, in order to prevent electromagnetic noise from leaking from the gap, the electromagnetic shielding structure installs a first carbon brush in the gap between the third shielding cover and the coupling, and the first carbon brush is arranged in a ring shape in the gap to form a shielding wall, which can attenuate, weaken, and block the residual electromagnetic noise emitted outward through the gap. In addition, the electromagnetic shielding structure sets a second carbon brush between the encoder at the tail of the motor and the motor housing, and guides the residual shaft current at the encoder end to the motor housing by diverting the shaft current, thereby attenuating, weakening, and blocking the electromagnetic noise emitted outward from the encoder end, further improving the shielding effect of the motor electromagnetic noise, realizing all-round electromagnetic shielding of the motor, and being able to fully block the electromagnetic noise generated by the motor, ensuring the high accuracy of the EMC test equipment during the test process.

[0018] Therefore, the electromagnetic shielding structure and test equipment of the motor shaft system components provided by the present invention can perform all-round comprehensive electromagnetic noise shielding treatment on the entire motor and its associated rotating parts after the above comprehensive shielding treatment, and can completely shield all bands of electromagnetic noise that affect the test performance of the equipment. It can completely shield the electromagnetic noise emitted by the motor shaft system components, ensuring that the electromagnetic noise generated by the motor shaft system components is completely blocked inside the shielding cover, effectively preventing the electromagnetic noise from leaking outward through any possible path, thereby greatly improving the accuracy of the EMC test equipment during the test process and ensuring the reliability of the test results. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A three-dimensional diagram of the electromagnetic shielding structure of the motor shaft system component provided by the present invention.

[0020] Figure 2 for Figure 1 A three-dimensional diagram of the partial structure of the electromagnetic shielding structure.

[0021] Figure 3 A cross-sectional stereoscopic view of the electromagnetic shielding structure of the motor shaft system component provided by the present invention.

[0022] Figure 4 for Figure 3 A sectional stereoscopic view of a portion of the electromagnetic shielding structure.

[0023] Figure 5 A cross-sectional view of the electromagnetic shielding structure of the motor shaft system component provided by the present invention.

[0024] Figure 6 for Figure 5 A cross-sectional view of a partial structure of an electromagnetic shielding structure.

[0025] Figure 7 for Figure 4 A partial enlarged view of B in FIG.

[0026] Figure 8 for Figure 6 A partial enlarged view of C in FIG.

[0027] Fig. 9 for Figure 6 A partial enlarged view of D in FIG.

[0028] In the figure: 1. first shielding cover; 2. second shielding cover; 3. third shielding cover; 4. insulating shaft; 5. first carbon brush; 6. second carbon brush; 7. motor; 8. hub; 9. coupling; 10. connecting shaft; 11. frame. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] In the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0031] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0032] Please refer to Figures 1 to 9 An embodiment of the present invention provides an electromagnetic shielding structure of a motor shaft system component. In some embodiments, the electromagnetic shielding structure includes a motor 7, wherein the output shaft of the motor 7 is connected to an insulating shaft 4, wherein the insulating shaft 4 is connected to a connecting shaft 10 through a coupling 9, wherein a hub 8 is provided on the outer sleeve of the connecting shaft 10, and the motor 7 drives the hub 8 to rotate through the insulating shaft 4, the coupling 9, and the connecting shaft 10; the outer cover of the motor 7 is provided with a first shielding cover 1, the outer cover of the output shaft of the motor 7 is provided with a second shielding cover 2, and the outer covers of the insulating shaft 4 and the coupling 9 are provided with a third shielding cover 3, wherein the first shielding cover 1, the second shielding cover 2, and the third shielding cover 3 are connected to form a shielding layer and cover the entire motor shaft system component to prevent the electromagnetic noise generated by the motor 7 from being emitted outward.

[0033] The electromagnetic shielding structure provided in this embodiment of the present application has a first shielding cover 1 which is arranged outside the motor 7 and is a shielding cover of the motor 7, which is used to shield the electromagnetic noise generated by the motor 7; a second shielding cover 2 which is arranged outside the output shaft of the motor 7 and is a shielding cover of the output shaft of the motor 7 and is used to shield the electromagnetic noise of the output shaft of the motor 7, and the second shielding cover 2 can be used as an intermediate transition shielding cover to connect the first shielding cover 1 and the third shielding cover 3; the third shielding cover 3 which is arranged outside the insulating shaft 4 and the coupling 9 and is a shielding cover of part of the motor shaft system components and is used to shield the electromagnetic noise of part of the motor shaft system components composed of the insulating shaft 4 and the coupling 9.

[0034] Therefore, the electromagnetic shielding structure forms a shielding layer by connecting the first shielding cover 1, the second shielding cover 2 and the third shielding cover 3, covering the entire motor shaft system components, blocking the electromagnetic noise generated by the motor 7 from being emitted outward, and can perform comprehensive electromagnetic noise shielding treatment on the entire motor 7 and its associated rotating parts, shielding all bands of electromagnetic noise that affect the test performance of the equipment, and effectively blocking the electromagnetic noise generated by the motor shaft system components, thereby significantly improving the test accuracy and reliability of the EMC test equipment.

[0035] It should be noted that the motor 7 is the main power source of the EMC test equipment, the main motor of the EMC test equipment, drives the entire system to operate, is the main source of electromagnetic noise, and needs special shielding. The coupling 9 connects the insulating shaft 4 and the connecting shaft 10 to ensure smooth power transmission.

[0036] In some embodiments, the insulating shaft 4 is connected between the output shaft of the motor 7 and the coupling 9 to cut off the conduction of residual shaft current between the motor 7 and the connecting shaft 10 to block the electromagnetic noise emitted outward by the coupling 9.

[0037] Furthermore, the insulating shaft 4 is made of insulating material.

[0038] In this embodiment, the electromagnetic shielding structure cuts off the conduction path of the residual shaft current between the motor 7 and the connecting shaft 10 or the hub 8 through the insulating shaft 4, thereby being able to attenuate, weaken and block the electromagnetic noise emitted outward by the coupling 9, preventing the residual electromagnetic noise from leaking into the laboratory space along the rotating parts associated with the motor 7, thereby ensuring the accuracy and reliability of the EMC test equipment.

[0039] Please refer to Figure 3 , Figure 4 , Figure 5 , Figure 6 and Fig. 9 In some embodiments, the third shielding cover 3 is disposed on the outer periphery of the rotatable coupling 9 and has a gap with the coupling 9 , and a first carbon brush 5 is disposed in the gap between the third shielding cover 3 and the coupling 9 .

[0040] Furthermore, the first carbon brush 5 is arranged in a ring shape in the gap between the third shielding cover 3 and the coupling 9, and forms a shielding wall to block the residual electromagnetic noise emitted outward through the gap between the third shielding cover 3 and the coupling 9.

[0041] In this embodiment, the first shielding cover 1, the second shielding cover 2 and the third shielding cover 3 of the electromagnetic shielding structure are connected to each other and cover the entire motor shaft system, and there is only a gap between the rotating coupling 9 and the fixed third shielding cover 3. Therefore, in order to prevent electromagnetic noise from leaking from the gap, the electromagnetic shielding structure installs the first carbon brush 5 in the gap between the third shielding cover 3 and the coupling 9, and the first carbon brush 5 is arranged in the gap in an annular shape to form a shielding wall, which can attenuate and weaken and block the residual electromagnetic noise emitted outward through the gap.

[0042] Please refer to Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 and Figure 8In some embodiments, a second carbon brush 6 is provided between the encoder at the tail of the motor 7 and the housing of the motor 7. The second carbon brush 6 is used to guide the residual shaft current of the encoder at the tail of the motor 7 to the housing of the motor 7 to block the electromagnetic noise emitted outward from the encoder end.

[0043] Furthermore, the housings of the second carbon brush 6 and the motor 7 are located inside the first shielding cover 1, so that the first shielding cover 1 fully seals the motor 7, ensuring that there is no gap and preventing leakage of electromagnetic noise.

[0044] The tail of the motor 7 refers to the end of the motor 7 away from the rotating hub 8. In this embodiment, the electromagnetic shielding structure is provided with a second carbon brush 6 between the encoder at the tail of the motor 7 and the housing of the motor 7, and the shaft current remaining at the encoder end is guided to the housing of the motor 7 by diverting the shaft current, thereby attenuating and weakening, and blocking the electromagnetic noise emitted from the encoder end, further improving the shielding effect of the electromagnetic noise of the motor 7, realizing all-round electromagnetic shielding of the motor 7, being able to fully block the electromagnetic noise generated by the motor 7, and ensuring the high accuracy of the EMC test equipment during the test process.

[0045] Furthermore, the output shaft of the motor 7 is fixedly connected to the insulating shaft 4, the end of the insulating shaft 4 away from the output shaft of the motor 7 is fixedly connected to the coupling 9, the coupling 9 is fixedly connected to the connecting shaft 10, and the rotating hub 8 is sleeved outside the connecting shaft 10 and fixedly connected to the connecting shaft 10.

[0046] Furthermore, the output shaft of the motor 7, the insulating shaft 4, the coupling 9, the connecting shaft 10 and the rotating hub 8 are coaxial.

[0047] In addition, the present invention also provides a test device, including the electromagnetic shielding structure of a motor shaft system component, the test device is used to test a vehicle, and the test device also includes a frame 11, and the electromagnetic shielding structure is installed on the frame 11.

[0048] In summary, the electromagnetic shielding structure and test equipment of the motor shaft system components provided by the present invention, through the first shielding cover, the second shielding cover and the third shielding cover connected to form a shielding layer, the entire motor shaft system components are covered, and the electromagnetic noise generated by the motor is blocked from being emitted outward, and the entire motor and its associated rotating parts can be subjected to comprehensive electromagnetic noise shielding treatment, and all bands of electromagnetic noise that affect the test performance of the equipment are completely shielded, and the electromagnetic noise generated by the motor shaft system components is effectively blocked, thereby significantly improving the test accuracy and reliability of the EMC test equipment. In addition, the electromagnetic shielding structure sets an insulating shaft between the output shaft of the motor and the coupling, and cuts off the conduction path of the residual shaft current between the motor and the connecting shaft or the rotating hub through the insulating shaft, thereby being able to attenuate, weaken and block the electromagnetic noise emitted outward by the coupling, and prevent the residual electromagnetic noise from leaking into the laboratory space along the rotating parts associated with the motor. Since the electromagnetic shielding structure only has a gap between the rotating coupling and the fixed third shielding cover, in order to prevent electromagnetic noise from leaking from the gap, the electromagnetic shielding structure installs a first carbon brush in the gap between the third shielding cover and the coupling, and the first carbon brush is arranged in a ring shape in the gap to form a shielding wall, which can attenuate, weaken, and block the residual electromagnetic noise emitted outward through the gap. In addition, the electromagnetic shielding structure sets a second carbon brush between the encoder at the tail of the motor and the motor housing, and guides the residual shaft current at the encoder end to the motor housing by diverting the shaft current, thereby attenuating, weakening, and blocking the electromagnetic noise emitted outward from the encoder end, further improving the shielding effect of the motor electromagnetic noise, realizing all-round electromagnetic shielding of the motor, and being able to fully block the electromagnetic noise generated by the motor, ensuring the high accuracy of the EMC test equipment during the test process.

[0049] Therefore, the electromagnetic shielding structure and test equipment of the motor shaft system components provided by the present invention can perform all-round comprehensive electromagnetic noise shielding treatment on the entire motor and its associated rotating parts after the above comprehensive shielding treatment, and can completely shield all bands of electromagnetic noise that affect the test performance of the equipment. It can completely shield the electromagnetic noise emitted by the motor shaft system components, ensuring that the electromagnetic noise generated by the motor shaft system components is completely blocked inside the shielding cover, effectively preventing the electromagnetic noise from leaking outward through any possible path, thereby greatly improving the accuracy of the EMC test equipment during the test process and ensuring the reliability of the test results.

[0050] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention, and should be included in the protection scope of the present invention.

Claims

1. An electromagnetic shielding structure of a motor shaft system component, characterized in that: It includes a motor, wherein the output shaft of the motor is connected to an insulating shaft, the insulating shaft is connected to a connecting shaft through a coupling, a hub is provided on the outer sleeve of the connecting shaft, and the motor drives the hub to rotate through the insulating shaft, the coupling and the connecting shaft; the motor cover is provided with a first shielding cover, the output shaft cover of the motor is provided with a second shielding cover, the insulating shaft and the coupling cover are provided with a third shielding cover, the first shielding cover, the second shielding cover and the third shielding cover are connected to form a shielding layer and cover the entire motor shaft system components to block the electromagnetic noise generated by the motor from being emitted outward.

2. The electromagnetic shielding structure according to claim 1, characterized in that: The insulating shaft is connected between the output shaft of the motor and the coupling, and is used to cut off the conduction of residual shaft current between the motor and the connecting shaft, so as to block the electromagnetic noise emitted outward by the coupling.

3. The electromagnetic shielding structure according to claim 2, characterized in that: The insulating shaft is made of insulating material.

4. The electromagnetic shielding structure according to claim 1, characterized in that: The third shielding cover is arranged on the outer periphery of the rotatable coupling and has a gap with the coupling. A first carbon brush is arranged in the gap between the third shielding cover and the coupling.

5. The electromagnetic shielding structure according to claim 4, characterized in that: The first carbon brush is arranged in a ring shape in the gap between the third shielding cover and the coupling, and forms a shielding wall to block the residual electromagnetic noise emitted outward through the gap between the third shielding cover and the coupling.

6. The electromagnetic shielding structure according to claim 1, characterized in that: A second carbon brush is arranged between the encoder arranged at the tail of the motor and the housing of the motor. The second carbon brush is used to guide the residual shaft current of the encoder at the tail of the motor to the housing of the motor to block the electromagnetic noise emitted outward from the encoder end.

7. The electromagnetic shielding structure according to claim 6, characterized in that: The second carbon brush and the motor housing are located in the first shielding cover.

8. The electromagnetic shielding structure according to any one of claims 1 to 7, characterized in that: The output shaft of the motor is fixedly connected to the insulating shaft, one end of the insulating shaft away from the output shaft of the motor is fixedly connected to the coupling, the coupling is fixedly connected to the connecting shaft, and the rotating hub is sleeved outside the connecting shaft and fixedly connected to the connecting shaft.

9. The electromagnetic shielding structure according to any one of claims 1 to 7, characterized in that: The motor comprises an output shaft, an insulating shaft, a coupling, a connecting shaft and a rotating hub coaxial line.

10. A testing device, characterized in that: It comprises the electromagnetic shielding structure according to any one of claims 1 to 9, and a frame, wherein the electromagnetic shielding structure is installed on the frame.

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