CN218848228U - Motor shaft voltage measuring tool - Google Patents
Motor shaft voltage measuring tool Download PDFInfo
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- CN218848228U CN218848228U CN202223022317.4U CN202223022317U CN218848228U CN 218848228 U CN218848228 U CN 218848228U CN 202223022317 U CN202223022317 U CN 202223022317U CN 218848228 U CN218848228 U CN 218848228U
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- carbon brush
- measuring
- motor shaft
- arc
- measuring rod
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/64—Electric machine technologies in electromobility
Abstract
The utility model discloses a motor shaft voltage measuring tool, which comprises a measuring rod, a carbon brush and an universal meter; one end of the measuring rod is provided with a soft handle end which is convenient to grasp, and the other end of the measuring rod is provided with an arc-shaped bent end; the carbon brush is arranged at the arc-shaped bent end of the measuring rod, can be contacted with a motor shaft rotating at a high speed, and has an arc-shaped curved surface; the universal meter is connected with the carbon brush through a measuring lead. This motor shaft voltage measuring tool is through changing the shape of carbon brush and the motor shaft contact of high-speed rotation to and change the shape of measuring stick, thereby reduce the contact resistance of the motor shaft of high-speed rotation to carbon brush and measuring stick, avoid survey crew to lose the control to the measuring stick, avoid causing the threat for the personal and equipment safety in motor shaft voltage measurement process.
Description
Technical Field
The utility model relates to a voltage measurement field, in particular to motor shaft voltage measuring tool.
Background
During operation of the steam turbine generator, an electromotive force existing on the rotating shaft is induced in the axial direction of the rotor due to the unbalanced magnetic flux. This type of unbalanced flux is caused by non-uniformity of the air gap between the stator and the rotor. The electromotive force of the non-uniform shaft will form a closed loop along the rotor shaft, bearings and base, and generate a shaft current in the loop. This current can cause overheating of the bearing rings through the bearings, reducing the quality of the lubricating oil, even burning the bearing rings, or causing the bearings to break due to accelerated mechanical wear, forcing the generator to shut down and causing an accident. Therefore, an insulating bearing is used at one end of the generator rotor to prevent current from flowing out of the shaft; and the generator shaft voltage is measured during overhaul and when necessary.
Currently, a shaft voltage measuring tool of a motor mostly adopts a measuring rod, a carbon brush and a multimeter to perform measurement in a matching way, for example, a motor shaft voltage measuring tool disclosed in a patent document with a patent application number of CN201620956438.1, a generator shaft voltage measuring device disclosed in a patent document with a patent application number of CN201820993644.9, and a turbogenerator shaft voltage measuring device disclosed in a patent document with a patent application number of CN 202221262415.2; however, since the measuring rod of the motor shaft voltage measuring device adopts the long straight rod body, the carbon brush is installed at the end of the measuring rod, and in the shaft voltage measuring process of the motor, in order to ensure that the carbon brush is constantly contacted with the motor shaft rotating at a high speed, personnel need to overcome the contact resistance of the motor shaft to the carbon brush and the measuring rod, so that the measuring personnel can easily lose control over the measuring rod due to friction force, even lose balance, and cause great threat to personal and equipment safety.
SUMMERY OF THE UTILITY MODEL
In order to solve the problem, the utility model provides a motor shaft voltage measuring tool can avoid the carbon brush when contacting with the motor shaft of high-speed rotation through this motor shaft voltage measuring tool, makes survey crew lose the control to the measuring stick because of frictional force to guarantee personal and equipment safety among the motor shaft voltage measurement process.
The utility model adopts the technical proposal that:
a motor shaft voltage measuring tool comprises a measuring rod, a carbon brush and a universal meter; one end of the measuring rod is provided with a soft handle end which is convenient to grasp, and the other end of the measuring rod is provided with an arc-shaped bent end; the carbon brush is arranged at the arc-shaped bent end of the measuring rod and can be contacted with a motor shaft rotating at a high speed, and the contact surface is an arc-shaped curved surface; the universal meter is connected with the carbon brush through the measuring wire.
Further, the carbon brush is mounted at the end of the arc-shaped bent end of the measuring rod, a carbon brush mounting groove is formed in the end of the bent end, the bottom of the carbon brush is inserted into the carbon brush mounting groove, the position of the carbon brush relative to the measuring rod is fixed through a screw rod penetrating through the measuring rod and the carbon brush, and an inward-concave arc-shaped curved surface is formed at the top of the carbon brush exposed in the carbon brush mounting groove; one end of the measuring wire penetrates through the measuring rod to be connected with the bottom of the carbon brush in the carbon brush mounting groove.
Furthermore, the measuring wire is connected with the carbon brush and the universal meter through wiring inside the rod body of the measuring rod; the universal meter passes through clamp detachable and installs on the measuring stick, and is close to soft handle end.
Further, the carbon brush is installed in the arc section of the arc bending end of the measuring rod, a carbon brush installation groove is formed in the arc section of the arc bending end, the bottom of the carbon brush is inserted into the carbon brush installation groove, the position of the carbon brush relative to the measuring rod is fixed through a screw rod penetrating through the measuring rod and the carbon brush, and an inward-concave arc-shaped curved surface is formed at the top of the carbon brush exposed in the carbon brush installation groove.
Further, the carbon brush is installed in the arc section of the arc bending end of the measuring rod, and a carbon brush installation groove is formed in the arc section of the arc bending end; the carbon brush comprises a plurality of cylindrical graphite rollers, the cylindrical graphite rollers are rotatably arranged between two conductive metal sheets through metal shafts, the conductive metal sheets are arc-shaped plate bodies, the conductive metal sheets are fixedly arranged in carbon brush mounting grooves, and roller bodies of the cylindrical graphite rollers are partially exposed out of the carbon brush mounting grooves; one end of the measuring lead is connected with the conductive metal sheet.
Furthermore, this motor shaft voltage measuring tool still includes the earth connection, earth connection one end is connected with soft handle end, and the other end ground connection.
The utility model has the advantages that:
this motor shaft voltage measuring tool is through changing the shape of carbon brush and the motor shaft contact of high-speed rotation to and change the shape of measuring stick, thereby reduce the contact resistance of the motor shaft of high-speed rotation to carbon brush and measuring stick, avoid survey crew to lose the control to the measuring stick, avoid causing the threat for the personal and equipment safety in motor shaft voltage measurement process.
Drawings
Fig. 1 and fig. 2 are schematic structural views of embodiment 1 of the present invention;
fig. 3 is an enlarged view of a partial structure of embodiment 1 of the present invention;
fig. 4 is a schematic structural diagram of embodiment 2 of the present invention;
fig. 5 and 6 are schematic structural views of embodiment 3 of the present invention;
in fig. 1-6, 1-measuring rod, 2-carbon brush, 3-multimeter, 4-soft handle end, 5-arc bending end, 6-measuring wire, 7-carbon brush mounting groove, 8-screw rod, 9-arc curved surface, 10-clamp, 11-cylindrical graphite roller, 12-metal shaft, 13-conductive metal sheet, 14-grounding wire, 15-motor shaft.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings of the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
Example 1
As shown in fig. 1, the present embodiment provides a motor shaft voltage measuring tool including a measuring rod 1, a carbon brush 2, and a multimeter 3. The length of the measuring rod 1 is 110-120cm, one end of the measuring rod 1 is provided with a soft handle end 4 which is convenient to grasp, the length of the soft handle end 4 is 20-25cm, and the surface of the soft handle end 4 is provided with an anti-skid and insulating protective material; the other end of the measuring rod 1 is formed with an arc-shaped bent end 5. As shown in fig. 1 and 3, the carbon brush 2 is installed at the end of the arc-shaped bent end 5 of the measuring rod 1, a carbon brush installation groove 7 is formed at the end of the bent end, the bottom of the carbon brush 2 is inserted into the carbon brush installation groove 7, the carbon brush 2 fixes the position of the carbon brush 2 relative to the measuring rod 1 by a screw rod 8 penetrating through the measuring rod 1 and the carbon brush 2, and after the screw rod 8 is removed, different carbon brushes 2 can be replaced; the carbon brush 2 is exposed out of the top of the carbon brush mounting groove 7 to form an inward concave arc-shaped curved surface 9, and the radians of the arc-shaped curved surfaces 9 of different carbon brushes 2 are different, so that the carbon brush 2 can be attached to the motor shaft 15 through the inward concave arc-shaped curved surface 9 at the top by replacing different carbon brushes 2. The universal meter 3 is connected with the carbon brush 2 through the measuring wire 6, and one end of the measuring wire 6 penetrates through the measuring rod 1 to be connected with the bottom of the carbon brush 2 in the carbon brush mounting groove 7.
When the motor shaft voltage measuring tool is used, firstly, a proper carbon brush 2 is selected according to the diameter size of a motor shaft 15, then, one end of a measuring wire 6 is connected with the bottom of the carbon brush 2, then, the carbon brush 2 is inserted into a carbon brush mounting groove 7 of a measuring rod 1, and the position of the carbon brush 2 is fixed through a screw 8; the other end of measurement lead 6 is then connected to multimeter 3. A measurer holds the motor shaft voltage measuring tool by hand and stands on one side of the motor shaft 15 and is positioned on the insulating pad, the soft handle end 4 of the measuring rod 1 is held to enable the position of the carbon brush 2 to be in contact with the motor shaft 15 rotating at a high speed, the rotating direction of the motor shaft 15 is as shown by an arrow in the figure, the carbon brush 2 enables the inward sunken arc-shaped curved surface 9 to be in contact with the motor shaft 15 rotating at a high speed all the time by utilizing the self weight of the measuring rod 1, and therefore the voltage measurement of the motor shaft is achieved.
In the process of measuring the voltage of the motor shaft, because the carbon brush 2 is in contact with the motor shaft 15 rotating at a high speed by using the self weight of the measuring rod 1, a measurer does not need to overcome the contact resistance of the carbon brush 2 and the motor shaft 15 rotating at a high speed by using external force; meanwhile, the arc-shaped curved surface 9 with the inward concave carbon brush 2 can effectively reduce the contact resistance, prevent measuring personnel from losing control over the measuring rod 1, and prevent personal and equipment safety from being threatened in the process of measuring the voltage of the motor shaft.
Further, in order to avoid the winding phenomenon of the measuring wire 6 contacting with the motor shaft 15 during the voltage measurement process of the motor shaft, as shown in fig. 2, the measuring wire 6 in this embodiment is connected with the carbon brush 2 and the multimeter 3 through the internal routing of the measuring rod 1. In addition, in order to facilitate a measurer to observe the reading of the multimeter 3 in the process of measuring the voltage of the motor shaft, in this embodiment, the multimeter 3 is detachably mounted on the measuring rod 1 through a hoop 10 and is close to the soft handle end 4; the arrangement is convenient for observing the reading of the universal meter 3, the counter weight of the measuring rod 1 can be increased, and the contact between the position of the carbon brush 2 and the motor shaft 15 rotating at high speed is facilitated.
Example 2
On the basis of embodiment 1, another installation form of the carbon brush 2 is provided in this embodiment, as shown in fig. 4, in this embodiment, the carbon brush 2 is installed in an arc section of the arc-shaped bent end 5 of the measuring rod 1, the arc section of the arc-shaped bent end 5 is provided with a carbon brush installation groove 7, the bottom of the carbon brush 2 is inserted into the carbon brush installation groove 7, the position of the carbon brush 2 relative to the measuring rod 1 is fixed by a screw 8 penetrating through the measuring rod 1 and the carbon brush 2, and an inward concave arc-shaped curved surface 9 is formed at the top of the carbon brush 2 exposed in the carbon brush installation groove 7.
In the process of measuring the voltage of the motor shaft, the arc-shaped bent section of the measuring rod 1 can be used for driving the carbon brush 2 to be in contact with the motor shaft 15 rotating at a high speed, so that the influence of the axial force of the motor shaft 15 rotating at a high speed on the carbon brush 2 and the measuring rod 1 is reduced, and a measurer is safer and more labor-saving in the process of measuring the voltage of the motor shaft.
Example 3
On the basis of embodiment 2, this embodiment provides a new carbon brush 2 structure, and the structure of the carbon brush 2 can reduce the friction between the carbon brush 2 and the motor shaft 15 rotating at high speed while meeting the voltage measurement of the motor shaft, so as to avoid the discharge spark at the contact point.
Specifically, as shown in fig. 5 and 6, the carbon brush 2 is installed in an arc section of the arc-shaped bent end 5 of the measuring rod 1, and a carbon brush installation groove 7 is formed in the arc section of the arc-shaped bent end 5; the carbon brush 2 comprises four cylindrical graphite rollers 11, the four cylindrical graphite rollers 11 are rotatably installed between two conductive metal sheets 13 through metal shafts 12, the conductive metal sheets 13 are arc-shaped plate bodies, the conductive metal sheets 13 are fixedly installed in the carbon brush installation groove 7, the roller body of each cylindrical graphite roller 11 is partially exposed outside the carbon brush installation groove 7, the four cylindrical graphite rollers 11 form an inwards-sunken arc-shaped curved surface, and each cylindrical graphite roller 11 is in rolling contact with a high-speed rotating motor shaft 15. One end of the measuring lead 6 is connected with the conductive metal sheet 13, and the other end is connected with the multimeter 3.
Since each cylindrical graphite roller 11 is in rolling contact with the motor shaft 15 rotating at a high speed, the influence of the axial force of the motor shaft 15 rotating at a high speed on the carbon brush 2 and the measuring rod 1 can be further reduced; secondly, the friction between the carbon brush 2 and the motor shaft 15 rotating at high speed can be reduced, and discharge sparks at contact points can be avoided; thirdly, damage to the motor shaft 15 can be reduced; thereby making the motor shaft voltage measurement process safer.
Further, on the basis of the above embodiments, in order to further ensure the personal safety of the measuring personnel, as shown in fig. 1, fig. 2 and fig. 4, the motor shaft voltage measuring tool further includes a grounding wire 14, one end of the grounding wire 14 is connected with the soft handle end 4, and the other end is grounded.
Above, only be the concrete implementation of the preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art is in the technical scope of the present invention, according to the technical solution of the present invention and the design of the present invention, equivalent replacement or change should be covered within the protection scope of the present invention.
Claims (6)
1. A motor shaft voltage measuring tool comprises a measuring rod, a carbon brush and a universal meter; the method is characterized in that: one end of the measuring rod is provided with a soft handle end which is convenient to grasp, and the other end of the measuring rod is provided with an arc-shaped bent end; the carbon brush is arranged at the arc-shaped bent end of the measuring rod and can be contacted with a motor shaft rotating at a high speed, and the contact surface is an arc-shaped curved surface; the universal meter is connected with the carbon brush through a measuring wire.
2. The motor shaft voltage measuring tool of claim 1, wherein: the carbon brush is arranged at the end head of the arc-shaped bent end of the measuring rod, a carbon brush mounting groove is formed in the end head of the bent end, the bottom of the carbon brush is inserted into the carbon brush mounting groove, the position of the carbon brush relative to the measuring rod is fixed through a screw rod penetrating through the measuring rod and the carbon brush, and an inward-sunken arc-shaped curved surface is formed on the top of the carbon brush exposed in the carbon brush mounting groove; one end of the measuring wire penetrates through the measuring rod and is connected with the bottom of the carbon brush in the carbon brush mounting groove.
3. The motor shaft voltage measuring tool of claim 2, wherein: the measuring lead is connected with the carbon brush and the universal meter through wiring inside the rod body of the measuring rod; the universal meter passes through clamp detachable and installs on the measuring stick, and is close to soft handle end.
4. The motor shaft voltage measuring tool of claim 1, wherein: the carbon brush is installed in the arc section of the arc bending end of the measuring rod, a carbon brush installation groove is formed in the arc section of the arc bending end, the bottom of the carbon brush is inserted into the carbon brush installation groove, the position of the carbon brush relative to the measuring rod is fixed through a screw rod penetrating through the measuring rod and the carbon brush, and an inward-sunken arc-shaped curved surface is formed at the top of the carbon brush installation groove.
5. The motor shaft voltage measuring tool of claim 1, wherein: the carbon brush is arranged in the arc section of the arc bending end of the measuring rod, and a carbon brush mounting groove is formed in the arc section of the arc bending end; the carbon brush comprises a plurality of cylindrical graphite rollers, the cylindrical graphite rollers are rotatably arranged between two conductive metal sheets through metal shafts, the conductive metal sheets are arc-shaped plate bodies, the conductive metal sheets are fixedly arranged in carbon brush mounting grooves, and roller bodies of the cylindrical graphite rollers are partially exposed out of the carbon brush mounting grooves; one end of the measuring lead is connected with the conductive metal sheet.
6. The motor shaft voltage measuring tool of claim 1, wherein: the motor shaft voltage measuring tool further comprises a grounding wire, one end of the grounding wire is connected with the soft handle end, and the other end of the grounding wire is grounded.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223022317.4U CN218848228U (en) | 2022-11-15 | 2022-11-15 | Motor shaft voltage measuring tool |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223022317.4U CN218848228U (en) | 2022-11-15 | 2022-11-15 | Motor shaft voltage measuring tool |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218848228U true CN218848228U (en) | 2023-04-11 |
Family
ID=87299250
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202223022317.4U Active CN218848228U (en) | 2022-11-15 | 2022-11-15 | Motor shaft voltage measuring tool |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN218848228U (en) |
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2022
- 2022-11-15 CN CN202223022317.4U patent/CN218848228U/en active Active
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