CN117706139A - Shaft current probe fixing device and shaft current testing system - Google Patents
Shaft current probe fixing device and shaft current testing system Download PDFInfo
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- CN117706139A CN117706139A CN202311759583.1A CN202311759583A CN117706139A CN 117706139 A CN117706139 A CN 117706139A CN 202311759583 A CN202311759583 A CN 202311759583A CN 117706139 A CN117706139 A CN 117706139A
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- 239000002923 metal particle Substances 0.000 description 1
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- 238000003466 welding Methods 0.000 description 1
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Abstract
The invention relates to the technical field of driving motor systems, and discloses a shaft current probe fixing device and a shaft current testing system, which comprise the following components: the probe clamp comprises an arm rod assembly, a first connecting piece, a second connecting piece, a magnetic base for adsorbing a metal surface and a probe clamp for clamping a shaft current probe; the arm rod assembly comprises at least two arm rods, each arm rod is sequentially connected in a rotating mode, the magnetic attraction base is connected with one end of the arm rod assembly in a rotating mode through the first connecting piece, and the other end of the arm rod assembly is connected with the probe clamp in a rotating mode through the second connecting piece. The invention can solve the problems of fixing and testing safety of the current probe in the shaft current testing process of the driving motor system, can improve the testing precision, enlarge the frequency range of the test, reduce the risk of the test operation, and has the characteristics of convenient operation, simplicity and reliability.
Description
Technical Field
The invention relates to the technical field of driving motor systems, in particular to a fixing device of a shaft current probe and a shaft current testing system.
Background
With the rapid development of new energy automobiles, a driving motor system is continuously updated and iterated, researchers start to develop related researches on the shaft current of a bearing of the driving motor system, but a corresponding test standard system is not formed yet. At present, part of enterprises have not definitely required shaft current, and the limiting value requirements of the part of enterprises with the requirements on the shaft current are not uniform.
When the driving motor runs, shaft current exists in the bearing of the motor, and when the shaft current is large to a certain extent, the bearing of the motor is overheated, the bearing or the bearing position is burnt, even the bearing is damaged, and meanwhile, fine metal particles possibly enter bearing lubricating grease (oil), so that the bearing is worn and even the bearing is scattered due to heating. The external shaft current also can radiate electromagnetic waves to the space through the transmission shaft to generate additional disturbance paths, so that the normal work of other electronic components of the automobile is influenced, the radiation emission test of the driving motor system and the whole automobile is influenced, and the expected requirements of the radiation emission test results of the driving motor system and the whole automobile cannot be met.
How to perform the drive motor shaft current test is the key and difficult point of current research. At present, engineers can acquire shaft voltage by adopting an oscilloscope, but the method cannot see the result of the shaft current frequency domain and cannot reasonably evaluate electromagnetic disturbance; the method only evaluates electromagnetic disturbance of the shaft current in a narrow-band range, and has the most important point that the method cannot be used for testing on the whole automobile and a tester cannot drill under the automobile to test by means of a handheld device instrument except that the instability factor is large; the problems with both of the above methods are: testing while the drive motor system is running at high speed presents a significant safety risk.
Disclosure of Invention
The purpose of the invention is that: an axial current probe fixing device and an axial current testing system capable of solving the problems are designed.
In order to achieve the above object, the present invention provides a shaft current probe fixing device comprising: the probe clamp comprises an arm rod assembly, a first connecting piece, a second connecting piece, a magnetic base for adsorbing a metal surface and a probe clamp for clamping a shaft current probe;
the arm rod assembly comprises at least two arm rods, each arm rod is sequentially connected in a rotating mode, the magnetic attraction base is connected with one end of the arm rod assembly in a rotating mode through the first connecting piece, and the other end of the arm rod assembly is connected with the probe clamp in a rotating mode through the second connecting piece.
Further, the magnetic base comprises a first universal ball, the first connecting piece comprises a screw rod and a pair of clamping pieces, the two clamping pieces are connected through the screw rod, the distance between the two clamping pieces can be adjusted by rotating the screw rod, and the first universal ball is arranged between the two clamping pieces so that the first connecting piece is connected with the magnetic base.
Further, the arm rod assembly further comprises an arm rod connecting piece, second universal balls are arranged at two ends of the arm rod, and two adjacent arm rods are connected with the arm rod connecting piece through the second universal balls.
Further, a rubber layer is arranged on the outer wall of the second universal ball.
Further, a plastic gasket is arranged on the clamping inner wall of the probe clamp.
Further, the magnetic attraction base comprises a magnetic piece and a switch, and the switch is used for controlling the magnetic force of the magnetic piece to be turned on or turned off.
Further, the magnetic attraction base further comprises a shell and a magnet, the magnetic piece is made of soft magnetic materials and is arranged at the bottom of the shell, the magnet is arranged in the shell and is movably connected with the shell, the switch is connected with the magnet, and the switch is controlled to move up and down in the shell through controlling the magnet to control the magnetic force of the magnetic piece to be opened or closed.
Further, the arm lever assembly comprises three arm levers and two arm lever connecting pieces, and two adjacent arm levers are connected through the arm lever connecting pieces.
The invention also provides a shaft current testing system, which comprises: the current probe fixing device comprises a receiver, an attenuator, a current probe and the shaft current probe fixing device, wherein the current probe is clamped by a probe clamp, and the current probe, the attenuator and the receiver are electrically connected in sequence.
Further, the motor drive device further comprises a drive motor and a base, wherein the drive motor comprises a bearing, the magnetic attraction base is magnetically connected with the base, and the current probe faces towards the bearing.
Compared with the prior art, the shaft current probe fixing device and the shaft current testing system have the beneficial effects that:
according to the shaft current probe fixing device, the fixing problem and the testing safety problem of the current probe in the shaft current testing process of the driving motor system can be solved through the magnetic base, the arm rod assembly and the probe clamp, the testing precision can be improved, the frequency range of a test can be enlarged, the testing operation risk is reduced, and meanwhile the shaft current probe fixing device has the characteristics of being convenient to operate, simple and reliable.
The shaft current testing system of the embodiment of the invention provides a mode of a current probe, a receiver and an attenuator for shaft current testing, adopts a newly designed shaft current probe fixing device, fixes the current probe on a motor bearing, and connects the current probe with the receiver through the attenuator by using a coaxial cable so as to measure the magnitude of motor shaft current.
Drawings
FIG. 1 is a perspective view of a shaft current probe fixture according to an embodiment;
FIG. 2 is a perspective view of the shaft current probe fixture according to an embodiment;
FIG. 3 is a perspective view of the shaft current probe fixture according to an embodiment;
FIG. 4 is a perspective view of the shaft current probe fixture according to an embodiment;
fig. 5 is a schematic diagram of a shaft current test system structure according to an embodiment.
In the figure, 1, an arm lever assembly; 11. an arm lever; 111. a second universal ball; 12. an arm link; 2. a first connector; 21. a clamping piece; 22. a screw; 3. a second connector; 4. a magnetic base; 41. a first universal ball; 42. a housing; 43. a magnetic member; 44. a switch; 5. a probe clip; 6. a driving motor; 7. a base; 81. a receiver; 82. a current probe; 83. an attenuator; 84. protecting the preventive device; 9. shaft current probe fixing device.
Detailed Description
The following describes in further detail the embodiments of the present invention with reference to the drawings and examples. The following examples are illustrative of the invention and are not intended to limit the scope of the invention.
In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. in the present invention are based on the orientation or positional relationship shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention.
In the description of the present invention, it should be understood that the terms "connected," "fixed," and the like are used in the present invention in a broad sense, and for example, may be fixedly connected, detachably connected, or integrated; the mechanical connection can be realized, and the welding connection can be realized; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
The terms "first", "second", etc. are used in the present invention to describe various information, but the information should not be limited to these terms, which are only used to distinguish the same type of information from each other. For example, a "first" message may also be referred to as a "second" message, and similarly, a "second" message may also be referred to as a "first" message, without departing from the scope of the invention.
Referring to fig. 1 and 2, a shaft current probe fixing apparatus according to an embodiment of the present invention includes: the magnetic attraction base 4 is used for attracting the metal surface, and the probe clamp 5 is used for clamping the shaft current probe 82; the arm rod assembly 1 comprises at least two arm rods 11, the arm rods 11 are sequentially connected in a rotating mode, the magnetic attraction base 4 is connected with one end of the arm rod assembly 1 in a rotating mode through the first connecting piece 2, and the other end of the arm rod assembly 1 is connected with the probe clamp 5 in a rotating mode through the second connecting piece 3. The magnetic base 4 is used for fixing the whole fixing device, the arm rod assembly 1 plays a supporting role, the number of the arm rods 11 can be increased or decreased specifically according to the height of the current probe 82, the probe clamp 5 is used for fixing the current probe 82 and is provided with a handle, and the opening and closing degree of the clamp can be controlled by rotating the handle at the upper end of the probe clamp 5.
Referring to fig. 3 and 4, in some improvements of the present application, the magnetic base 4 includes a first universal ball 41, the first connecting piece 2 includes a screw 22 and a pair of clamping pieces 21, the two clamping pieces 21 are connected by the screw 22, and a distance between the two clamping pieces 21 can be adjusted by rotating the screw 22, and the first universal ball 41 is disposed between the two clamping pieces 21 so that the first connecting piece 2 is connected with the magnetic base 4.
In some improvements of the present application, the arm assembly 1 further includes an arm connecting piece, two ends of the arm 11 are respectively provided with a second universal ball 111, and two adjacent arm 11 are connected by the second universal balls 111 and the arm connecting piece, so that two adjacent arm 11 can be fixed in 360 degrees in an omnibearing manner, and therefore the angle and the height of the arm 11 can be adjusted arbitrarily, and the probe clip 5 and the current probe 82 can be located at any positions.
Specifically, the arm rod connecting piece and the second connecting piece 3 can be designed to be identical to the first connecting piece 2, universal balls are clamped at two ends through the appearance design of the screw rod 22 and the clamping piece 21, and a screwing handle is arranged at the top of the screw rod 22. The position and direction of the arm 11 are adjusted by unscrewing the screw 22 to arbitrarily change the height and angle of the probe, thereby increasing the applicable occasions, and then the arm is fixed by screwing the screw 22.
In some improvements of the present application, a rubber layer is disposed on the outer wall of the second universal ball 111, so that friction between the second universal ball 111 and the arm connecting piece can be enhanced, and the arm connecting piece can better fix the arm 11, so that the arm connecting piece can work effectively.
In some improvements of the present application, the clamping inner wall of the probe clamp 5 is provided with a plastic gasket, which can ensure that the current probe 82 is not damaged when clamped.
In some improvements of the present application, the magnetic base 4 includes a magnetic member 43 and a switch 44, and the switch 44 is used for controlling the magnetic force of the magnetic member 43 to be turned on or off. The magnetic switch 44 is used, so that the size of the base is reduced, and the stability of the base is effectively improved; by opening the switch 44, the magnetic member 43 in the magnetic attraction base 4 can be magnetically opened so as to be attracted to the ferrous metal surface.
In some improvements of the present application, the magnetic base 4 further includes a housing 42 and a magnet, the magnetic member 43 is made of soft magnetic material and is disposed at the bottom of the housing 42, the magnet is disposed in the housing 42 and is movably connected with the housing 42, the switch 44 is connected with the magnet, and the switch 44 is controlled to be opened or closed by controlling the magnet to move up and down in the housing 42 so as to control the magnetic force of the magnetic member 43. Specifically, since the magnetic member 43 at the bottom of the casing 42 is made of soft magnetic material, the magnet is vertically installed inside the casing 42, the magnetic poles at the upper and lower ends of the magnet are opposite, the N or S poles of the magnet are opposite to the magnetic member 43 made of soft magnetic material, and when the knob of the switch 44 is rotated to the OFF position, the polarity of the magnet is the same as that of the magnetic member 43 at the bottom, and no magnetic force is generated; when the switch 44 is turned to the OFF position, the polarity of the magnet is opposite to the polarity of the magnetic member 43 at the bottom, and a magnetic force is generated.
In some improvements of the present application, the arm assembly 1 includes three arm rods 11 and two arm rod connectors, and two adjacent arm rods 11 are connected by the arm rod connectors.
Referring to fig. 5, the present application also provides a shaft current testing system, comprising: the probe clamp 5 clamps the current probe 82, and the current probe 82, the attenuator 83 and the receiver are electrically connected in sequence.
The current probe 82 is adopted for testing, so that the factors of unstable contact of the voltage probe and the spectrometer probe are solved, the precision of a test result can be improved to a great extent, the test range is 100 kHz-1 GHz, and the full-band non-stop test can be realized. Specifically, a protection and prevention device 84 is further arranged between the attenuator 83 and the receiver 81, and is matched with the attenuator 83, so that impedance matching and reflection reduction of the current probe 82 and the receiver are realized, and the problem of impedance mismatch is solved. The shaft current probe fixing device 9 is used for fixing the current probe 82, so that the safety risk problem is solved, and an engineer can complete the test without holding an instrument. Specifically, the protection and prevention device 84 may be a transformer, a capacitor, or the like made of prepreg.
In some improvements of the present application, the motor drive device further comprises a drive motor 6 and a base 7, wherein the drive motor 6 comprises a bearing, the magnetic attraction base 4 is magnetically connected with the base 7, and the current probe 82 is arranged towards the bearing. By utilizing the technical scheme of the application, engineers can fix the current probe 82 in the bearing of the whole vehicle by utilizing the fixing device, so that the current test of the 6-axis driving motor on the whole vehicle is realized, which cannot be realized by a voltage probe method and a spectrometer method.
In summary, the embodiment of the invention provides a shaft current probe fixing device and a shaft current testing system, which have the following advantages:
1. compared with the original shaft current test mode of the voltage probe and the spectrometer, the test range of a wider frequency domain is realized, and the attenuator 83 is adopted to realize impedance matching, so that the test precision can be improved to a great extent;
2. the shaft current probe fixing device 9 is designed to randomly adjust the horizontal and vertical positions of the current probe 82, so that the bearing is more easily positioned at the center of the current probe 82, the accuracy of a test result is improved, and errors of the test result caused by hand shaking of a person are avoided;
3. compared with the original test mode that engineers hold a voltage probe and a frequency spectrograph, the scheme is safer, the condition that the test position is changed along with the vibration of a motor is avoided, the engineers cannot threaten life safety due to the rotation of the motor, and personal safety accidents are completely avoided;
4. the fixing device has the advantages of simplicity in operation, convenience in installation, small size and the like.
The foregoing is merely a preferred embodiment of the present invention, and it should be noted that modifications and substitutions can be made by those skilled in the art without departing from the technical principles of the present invention, and these modifications and substitutions should also be considered as being within the scope of the present invention.
Claims (10)
1. A shaft current probe fixing apparatus, comprising: the probe clamp comprises an arm rod assembly, a first connecting piece, a second connecting piece, a magnetic base for adsorbing a metal surface and a probe clamp for clamping a shaft current probe;
the arm rod assembly comprises at least two arm rods, each arm rod is sequentially connected in a rotating mode, the magnetic attraction base is connected with one end of the arm rod assembly in a rotating mode through the first connecting piece, and the other end of the arm rod assembly is connected with the probe clamp in a rotating mode through the second connecting piece.
2. The shaft current probe fixing device according to claim 1, wherein the magnetic attraction base comprises a first universal ball, the first connecting piece comprises a screw rod and a pair of clamping pieces, the two clamping pieces are connected through the screw rod, the distance between the two clamping pieces can be adjusted by rotating the screw rod, and the first universal ball is arranged between the two clamping pieces so that the first connecting piece is connected with the magnetic attraction base.
3. The shaft current probe mount of claim 1, wherein the arm assembly further comprises an arm connector, wherein the two ends of the arm are provided with second universal balls, and two adjacent arms are connected with the arm connector through the second universal balls.
4. A shaft current probe mount as in claim 3, wherein the outer wall of the second ball is provided with a rubber layer.
5. The shaft current probe mount of claim 1, wherein the clamping inner wall of the probe clamp is provided with a plastic spacer.
6. The shaft current probe mount of claim 1, wherein the magnetically attractable base includes a magnetic member and a switch for controlling magnetic force of the magnetic member to be turned on or off.
7. The shaft current probe fixing device according to claim 6, wherein the magnetic attraction base further comprises a shell and a magnet, the magnetic piece is made of soft magnetic materials and is arranged at the bottom of the shell, the magnet is arranged in the shell and is movably connected with the shell, the switch is connected with the magnet, and the switch is controlled to be opened or closed by controlling the magnet to move up and down in the shell so as to control the magnetic force of the magnetic piece.
8. A shaft current probe fixation device as in claim 3, comprising: the arm rod assembly comprises three arm rods and two arm rod connecting pieces, and two adjacent arm rods are connected through the arm rod connecting pieces.
9. A shaft current testing system, comprising: receiver, attenuator, current probe and the axle current probe fixing device of any one of claims 1-8, the probe clamp centre gripping the current probe, attenuator and receiver are electric connection in proper order.
10. The shaft current testing system of claim 9, further comprising a drive motor and a base, wherein the drive motor comprises a bearing, wherein the magnetically attractable base is magnetically coupled to the base, and wherein the current probe is disposed toward the bearing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311759583.1A CN117706139A (en) | 2023-12-20 | 2023-12-20 | Shaft current probe fixing device and shaft current testing system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311759583.1A CN117706139A (en) | 2023-12-20 | 2023-12-20 | Shaft current probe fixing device and shaft current testing system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117706139A true CN117706139A (en) | 2024-03-15 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311759583.1A Pending CN117706139A (en) | 2023-12-20 | 2023-12-20 | Shaft current probe fixing device and shaft current testing system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117706139A (en) |
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2023
- 2023-12-20 CN CN202311759583.1A patent/CN117706139A/en active Pending
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