Shaft voltage measuring device

Abstract

A shaft voltage measuring device relates to a measuring device, a carbon brush (10) is slidably connected in a slide hole (49), the other end of a wire (22) passes through a threading hole B (48) and a threading hole A (44), then is fixed on a fixed block (20) and is connected with a conductive connecting sheet (18), and one end of a support rod (8) passes into a through hole (26) along the other end of the through hole (26), so that a half of a plane (4) and a half of an external thread (7) are positioned in the through hole (26); the carbon brush is elastically arranged at one end of the supporting rod, the conductive connecting piece connected with the carbon brush through the wire is arranged at the other end of the supporting rod, the supporting seat is arranged at the bottom of the supporting rod, one end of each telescopic rod is in spherical hinge connection with the supporting seat, and the other end of each telescopic rod is in spherical hinge connection with the magnet block. The purpose that the telescopic rod and the magnet block are matched to be stably connected to the exterior of the motor in a multi-angle mode when the voltage of the motor shaft is measured, and measurement stability is kept is achieved.

Description

Technical Field

[0001] The utility model relates to a measuring device, in particular to a shaft voltage measuring device. Background Art

[0002] Shaft voltage refers to the potential generated on the shaft of a rotating motor or generator due to various reasons. This phenomenon can lead to the formation of shaft currents, which can harm the normal operation of the motor. The main causes of shaft voltage are: large local magnetic resistance of the stator core, uneven air gap between the stator and rotor, uneven armature reaction in fractional-slot motors, and the influence of high-order harmonics in the excitation system.

[0003] Shaft voltage measurement technology, a key component of power equipment maintenance, is crucial for ensuring proper motor operation, extending equipment life, and improving safety. It has a wide range of practical applications. First, during motor manufacturing and maintenance, shaft voltage measurement can be used to assess the insulation performance and stability of the motor, providing a basis for product quality control. Second, during motor operation, shaft voltage measurement can be used to monitor the motor's electrical status in real time, enabling the timely identification of potential faults and the implementation of appropriate maintenance measures. Furthermore, shaft voltage measurement can be applied to power system fault diagnosis and preventive maintenance.

[0004] Since motors of different models vary in size and appearance, if the contact between the measuring device and the part of the motor where the shaft voltage needs to be measured is unstable, data fluctuations will occur. Therefore, when actually measuring the shaft voltage at different parts of the motor, the stable placement of the shaft voltage measuring device becomes a problem. If the shaft voltage measuring device is not set firmly, it will also cause some safety hazards. Utility Model Content

[0005] In order to overcome the shortcomings of the background technology, the utility model discloses a shaft voltage measuring device, which elastically sets a carbon brush at one end of a support rod, sets a conductive connecting piece connected to the carbon brush through a wire at the other end of the support rod, and sets a support seat at the bottom of the support rod. Each end of the three telescopic rods is connected to the support seat by a ball joint, and the other end of each of the three telescopic rods is connected to a magnet block by a ball joint, thereby achieving the purpose of maintaining measurement stability by using the telescopic rods and the magnet blocks to be stably connected at multiple angles to the outside of the motor when measuring the motor shaft voltage.

[0006] In order to achieve the above-mentioned purpose, the present invention adopts the following technical solutions:

[0007] A shaft voltage measuring device comprises a measuring rod and a support, the measuring rod comprises a sleeve, an adjusting hand wheel, a support rod, a support tube and a carbon brush, a support rod is provided with a threading hole A passing through both ends thereof, a plane is provided on the outer edge surface of one end of the support rod, an external thread is provided on the outer edge surface of the support rod adjacent to the plane, a fixing block is provided at the end of one end of the support rod, an internal thread is provided at the end of the other end of the threading hole A, a sliding hole passing through both ends thereof is provided in the support tube, a screw rod A is provided at one end of the support tube, a threading hole B passing through the sliding hole is provided in the screw rod A, a through hole is provided in the sleeve, a fan-shaped stopper is provided at one end of the through hole, a screw rod B is provided in the middle of the outer wall of the sleeve, a screw hole B is provided in the adjusting hand wheel, a wire is provided at one end of the carbon brush, the screw A and the inner thread are fixed to the support rod. The threaded connection makes the wire hole A and the wire hole B pass through, and the carbon brush is slidably connected in the sliding hole. The other end of the wire passes through the wire hole B and the wire hole A and is fixed on the fixed block and connected to the conductive connecting piece. A spring is provided between the carbon brush and the bottom of the sliding hole. One end of the support rod is inserted into the through hole along the other end of the through hole so that half of the plane and half of the external thread are located in the through hole. The screw hole B is screwed to the external thread on the outside of the other end of the sleeve. The support includes a telescopic rod, a support seat and a magnet block. There are at least three telescopic rods. Each end of the three telescopic rods is connected to the bottom ball hinge of the support seat, and the other end of the three telescopic rods is connected to the top ball hinge of the three magnet blocks respectively. A screw hole C is provided at the center position of the top of the support seat, and the screw rod B is screwed to the screw hole C.

[0008] The shaft voltage measuring device is provided with a screw hole A on the fixing block. After the screw A passes through the mounting hole provided on the conductive connecting piece, the other end of the wire and the conductive connecting piece are fixed to the fixing block.

[0009] The shaft voltage measuring device is provided with a clamping groove on the side wall of one end of the support rod, and a clamping spring and an adjusting hand wheel are clamped on the clamping groove and are used to limit the end of the support rod.

[0010] The shaft voltage measuring device is provided with anti-slip grooves on the side wall of the adjusting hand wheel.

[0011] The shaft voltage measuring device is provided with a connecting rod between the screw B and the sleeve.

[0012] The shaft voltage measuring device is provided with a ball head B screwed to the telescopic rod at each end of the three telescopic rods, three circular grooves B are provided around the center position of the bottom of the support seat, rubber pads A are provided in the three circular grooves B, ball sockets A are provided at the bottom of the three rubber pads A, screw holes D are provided between every two of the three circular grooves B, three through holes A are provided around the center position on the pressure plate B, through holes B are provided between every two of the three through holes A, three screws D pass through the three through holes B and are screwed to the three screw holes D, the three ball heads B are confined in the three through holes A and placed in the ball sockets A provided in the three rubber pads A respectively.

[0013] The shaft voltage measuring device is provided with a ball head A screwed to the telescopic rod at the other end of each of the three telescopic rods, screw holes E are provided at the four corners of the top of the three magnet blocks, through holes E are provided at the four corners of the three pressure blocks A, and circular grooves A are provided at the center of the tops of the three pressure blocks A. Screw holes F are provided between the circular grooves A and the four through holes E on the top of each pressure block A. The same number of screws C as the screw holes E pass through the through holes E and are screwed to the screw holes E to fix the three pressure blocks A to the tops of the three magnet blocks respectively. Rubber pads B are provided in the three circular grooves A, ball sockets B are provided on the tops of the three rubber pads B, through holes D are provided at the center positions of the three pressure plates A, through holes C are provided at the four corners of the three pressure plates A, and screws B with the same number as the through holes C pass through the four through holes C provided on each pressure plate A and are screwed to the screw holes F provided on each pressure block A to fix the three pressure plates A on the tops of the three pressure blocks A respectively. The three ball heads A are confined in the three through holes D and placed in the ball sockets B provided on the three rubber pads B respectively.

[0014] In the shaft voltage measuring device, the sleeve, support rod and support tube are all made of insulating materials.

[0015] Due to the adoption of the above technical solution, the utility model has the following beneficial effects:

[0016] The shaft voltage measuring device described in the present invention is characterized in that a carbon brush is elastically arranged at one end of a support rod, a conductive connecting piece connected to the carbon brush through a wire is arranged at the other end of the support rod, and a support seat is arranged at the bottom of the support rod. One end of each of the three telescopic rods is connected to the support seat by a ball joint, and the other end of each of the three telescopic rods is connected to a magnet block by a ball joint, so that when measuring the shaft voltage of the motor, the telescopic rod and the magnet block are used to connect stably at multiple angles to the outside of the motor to maintain the stability of the measurement. The utility model has a reasonable structure, is easy to operate, has a wide range of applications, and has high measurement accuracy. It is fully applicable to the on-site environment and has outstanding innovation. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural diagram of the utility model;

[0018] Figure 2 This is a schematic diagram of the assembly structure of the utility model;

[0019] Figure 3 This is a schematic diagram of the structure of the adjusting hand wheel of the utility model;

[0020] Figure 4 This is a schematic diagram of the internal structure of the support rod of the utility model;

[0021] Figure 5 This is a schematic structural diagram of the casing of the utility model;

[0022] Figure 6This is a schematic diagram of the internal structure of the casing of the utility model;

[0023] Figure 7 This is a schematic diagram of the internal structure of the support tube of the utility model;

[0024] Figure 8 This is a structural diagram of the support seat of the utility model.

[0025] Figure: 1, telescopic rod; 2, screw A; 3, retaining ring; 4, plane; 5, sleeve; 6, adjusting hand wheel; 7, external thread; 8, support rod; 9, support tube; 10, carbon brush; 11, magnet block; 12, screw B; 13, ball head A; 14, pressure plate A; 15, pressure block A; 16, screw C; 17, support seat; 18, connecting piece; 19, screw hole A; 20, fixing block; 21, slot; 22, wire; 23, screw A; 24, spring; 25, screw hole B; 26, through hole; 2 7. Screw B; 28. Screw hole C; 29. ​​Screw hole D; 30. Rubber pad A; 31. Through hole A; 32. Through hole B; 33. Pressure plate B; 34. Screw D; 35. Ball head B; 36. Through hole C; 37. Through hole D; 38. Rubber pad B; 39. Screw hole E; 40. Through hole E; 41. Screw hole F; 42. Circular groove; 43. Anti-slip pattern; 44. Threading hole A; 45. Internal thread; 46. Connecting rod; 47. Sector-shaped block; 48. Threading hole B; 49. Sliding hole; 50. Circular groove B. DETAILED DESCRIPTION

[0026] The present invention can be explained in more detail through the following examples. The present invention is not limited to the following examples. The purpose of disclosing the present invention is to protect all changes and improvements within the scope of the present invention.

[0027] A shaft voltage measuring device includes a measuring rod and a support. The measuring rod includes a sleeve 5, an adjusting handwheel 6, a support rod 8, a support tube 9 and a carbon brush 10. A threading hole A44 is provided in the support rod 8 and passes through both ends thereof. A plane 4 is provided on the outer edge surface of one end of the support rod 8. An external thread 7 is provided on the outer edge surface of the support rod 8 adjacent to the plane 4. A fixing block 20 is provided at the end of one end of the support rod 8. An internal thread 45 is provided at the end of the other end of the threading hole A44. A sliding hole 49 is provided in the support tube 9 and passes through both ends thereof. A screw A23 is provided at one end of the support tube 9. A threading hole B48 passing through the sliding hole 49 is provided in the screw A23. A through hole 26 is provided in the sleeve 5. A fan-shaped block 47 is provided at one end of the through hole 26. A screw B27 is provided in the middle of the outer wall of the sleeve 5. A screw hole B25 is provided in the adjusting hand wheel 6, an anti-slip pattern 43 is provided on the side wall of the adjusting hand wheel 6, a wire 22 is provided at one end of the carbon brush 10, the screw A23 and the internal thread 45 are screwed to make the threading hole A44 and the threading hole B48 pass through, the carbon brush 10 is slidably connected in the sliding hole 49, the other end of the wire 22 is fixed on the fixed block 20 after passing through the threading hole B48 and the threading hole A44 and connected to the conductive connecting piece 18, a screw hole A19 is provided on the fixing block 20, after the screw A2 passes through the mounting hole provided in the conductive connecting piece 18, the other end of the wire 22 and the conductive connecting piece 18 are fixed to the fixing block 20, a spring 24 is provided between the carbon brush 10 and the bottom of the sliding hole 49, one end of the support rod 8 is inserted into the through hole 26 along the other end of the through hole 26 so that the plane 4 and half of the external thread 7 are located in the through hole 26, the screw hole B25 is screwed on the external thread 7 on the outside of the other end of the sleeve 5, and a slot 21 is provided on the side wall of the end of one end of the support rod 8. A retaining spring 3 and an adjusting hand wheel 6 are clamped on the slot 21 and are used together to limit one end of the support rod 8. The support includes a telescopic rod 1, a support seat 17 and a magnet block 11. There are at least three telescopic rods 1, and each end of the three telescopic rods 1 is connected to the bottom ball hinge of the support seat 17. A ball head B35 screwed to the telescopic rod 1 is provided at each end of the three telescopic rods 1. Three circular grooves B50 are provided around the center of the bottom of the support seat 17. Rubber pads A30 are provided in the three circular grooves B50. Ball sockets A are provided at the bottom of the three rubber pads A30. There are screw holes D29 between each pair. Three through-holes A31 are provided around the center of the pressure plate B33. There are through-holes B32 between each pair of through-holes A31. Three screws D34 pass through the three through-holes B32 and are screwed to the three screw holes D29. The three ball heads B35 are confined within the three through-holes A31 and placed in the ball sockets A provided on the three rubber pads A30. The other ends of the three telescopic rods 1 are respectively connected to the tops of the three magnet blocks 11 with ball hinges. The other ends of the three telescopic rods 1 are provided with ball heads A13 that are screwed to the telescopic rods 1. Screw holes E39 are provided at the four corners of the tops of the three magnet blocks 11. There are through-holes E40 at the four corners of the three pressure blocks A15. There are circular grooves A42 at the center of the tops of the three pressure blocks A15.There are screw holes F41 between the circular groove A42 and the four through holes E40 on the top of each pressing block A15. The same number of screws C16 as the screw holes E39 pass through the through holes E40 and are screwed to the screw holes E39 to fix the three pressing blocks A15 on the top of the three magnet blocks 11 respectively. There are rubber pads B38 in the three circular grooves A42. There are ball sockets B on the tops of the three rubber pads B38. There are through holes D37 at the center of the three pressing plates A14. There are through holes C36 at the four corners of the three pressing plates A14. The same number of through holes C36 Screws B12 pass through the four through-holes C36 of each pressure plate A14 and are then screwed into the screw holes F41 of each pressure block A15, securing the three pressure plates A14 to the tops of the three pressure blocks A15. The three ball heads A13 are confined within the three through-holes D37 and placed within the ball sockets B of the three rubber pads B38. A screw hole C28 is located at the center of the top of the support seat 17, and screw rod B27 is screwed into screw hole C28. A connecting rod 46 is provided between screw B27 and the sleeve 5. The sleeve 5, support rod 8, and support tube 9 are all made of insulating material.

[0028] When implementing the shaft voltage measuring device described in the present invention, when using it, the end of the carbon brush 10 is vertically brought into contact with the part of the motor where the shaft voltage needs to be measured, and the length and angle of the three telescopic rods 1 are adjusted so that the three magnet blocks 11 are all stably attracted to the motor housing. The adjusting hand wheel 6 is twisted to slightly compress the spring 24, so that the carbon brush 10 elastically rests on the part of the motor where the shaft voltage needs to be measured. The coordinated setting of the plane 4 and the fan-shaped block 47 enables the support rod 8 to effectively move laterally without rotating. The coordinated setting of the ball head B35 and the ball socket A, and the ball head A13 and the ball socket B enables the ball head A13 and the ball head B35 to have a damping effect when rotating, thereby maintaining the stability of the support of the support rod 8. The conductive connecting piece 18 is electrically connected to the measuring instrument, the motor is started, and the shaft voltage of the motor is started.

[0029] The parts not described in detail in this utility model are prior art.

Claims

1. A shaft voltage measuring device, characterized in that: The measuring rod comprises a measuring rod and a support, wherein the measuring rod comprises a sleeve (5), an adjusting hand wheel (6), a support rod (8), a support tube (9) and a carbon brush (10), wherein a threading hole A (44) is provided in the support rod (8) and passes through both ends thereof, a plane (4) is provided on the outer edge surface of one end of the support rod (8), an external thread (7) is provided on the outer edge surface of the support rod (8) adjacent to the plane (4), a fixing block (20) is provided at the end of one end of the support rod (8), an internal thread (45) is provided at the end of the other end of the threading hole A (44), and a threading hole (45) is provided in the support tube (9). A sliding hole (49) is provided through both ends thereof, a screw rod A (23) is provided at one end of the support tube (9), a threading hole B (48) is provided in the screw rod A (23) and passes through the sliding hole (49), a through hole (26) is provided in the sleeve (5), a fan-shaped stopper (47) is provided at one end of the through hole (26), a screw rod B (27) is provided in the middle of the outer wall of the sleeve (5), a screw hole B (25) is provided in the adjusting hand wheel (6), a wire (22) is provided at one end of the carbon brush (10), and the screw rod A (23) and the internal thread (45) are screwed together. The threading hole A (44) and the threading hole B (48) are connected, the carbon brush (10) is slidably connected in the sliding hole (49), the other end of the wire (22) passes through the threading hole B (48) and the threading hole A (44) and is fixed on the fixed block (20) and connected to the conductive connecting piece (18), a spring (24) is provided between the carbon brush (10) and the bottom of the sliding hole (49), one end of the support rod (8) is passed through the through hole (26) along the other end thereof so that half of the plane (4) and half of the external thread (7) are located in the through hole (26) 6), the screw hole B (25) is screwed to the external thread (7) on the outside of the other end of the sleeve (5), and the support includes a telescopic rod (1), a support base (17) and a magnet block (11). There are at least three telescopic rods (1), one end of each of the three telescopic rods (1) is connected to the bottom ball hinge of the support base (17), and the other end of each of the three telescopic rods (1) is connected to the top ball hinge of the three magnet blocks (11). A screw hole C (28) is provided at the center position of the top of the support base (17), and the screw rod B (27) and the screw hole C (28) are screwed.

2. The shaft voltage measuring device according to claim 1 is characterized in that: The fixing block (20) is provided with a screw hole A (19), and after the screw A (2) passes through the mounting hole provided in the conductive connecting piece (18), the other end of the wire (22) and the conductive connecting piece (18) are fixed to the fixing block (20).

3. The shaft voltage measuring device according to claim 1, wherein: A clamping groove (21) is provided on the side wall of the end portion of one end of the support rod (8), and a clamping spring (3) and an adjusting hand wheel (6) are clamped on the clamping groove (21) and are used together to limit the position of one end of the support rod (8).

4. The shaft voltage measuring device according to claim 1, wherein: Anti-slip grooves (43) are provided on the side wall of the adjusting hand wheel (6).

5. The shaft voltage measuring device according to claim 1, characterized in that: A connecting rod (46) is provided between the screw B (27) and the sleeve (5).

6. The shaft voltage measuring device according to claim 1 is characterized in that: Each end of the three telescopic rods (1) is provided with a ball head B (35) screwed to the telescopic rod (1), three circular grooves B (50) are provided around the center position of the bottom of the support seat (17), rubber pads A (30) are provided in the three circular grooves B (50), ball sockets A are provided at the bottom of the three rubber pads A (30), screw holes D (29) are provided between each of the three circular grooves B (50), three through holes A (31) are provided around the center position on the pressure plate B (33), through holes B (32) are provided between each of the three through holes A (31), three screws D (34) pass through the three through holes B (32) and are screwed to the three screw holes D (29), and the three ball heads B (35) are confined in the three through holes A (31) and placed in the ball sockets A provided in the three rubber pads A (30).

7. The shaft voltage measuring device according to claim 1 is characterized in that: The other end of each of the three telescopic rods (1) is provided with a ball head A (13) screwed to the telescopic rod (1), screw holes E (39) are provided at the four corners of the top of the three magnet blocks (11), through holes E (40) are provided at the four corners of the three pressing blocks A (15), and circular grooves A (42) are provided at the center of the top of the three pressing blocks A (15). Screw holes F (41) are provided between the circular grooves A (42) provided on the top of each pressing block A (15) and the four through holes E (40). The same number of screws C (16) as the number of screw holes E (39) pass through the through holes E (40) and are screwed to the screw holes E (39) to fix the three pressing blocks A (15) to the top of the three magnet blocks (11) respectively. A (42) is provided with a rubber pad B (38), and a ball socket B is provided on the top of each of the three rubber pads B (38). A through hole D (37) is provided at the center of each of the three pressure plates A (14), and a through hole C (36) is provided at the four corners of the three pressure plates A (14). Screws B (12) with the same number as the through holes C (36) pass through the four through holes C (36) provided on each pressure plate A (14) and are screwed to the screw holes F (41) provided on each pressure block A (15) to fix the three pressure plates A (14) on the top of the three pressure blocks A (15). The three ball heads A (13) are confined in the three through holes D (37) and placed in the ball sockets B provided on the three rubber pads B (38).

8. The shaft voltage measuring device according to claim 1, characterized in that: The sleeve (5), the support rod (8) and the support tube (9) are all made of insulating materials.

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