Generator shaft current monitoring device
By introducing a displacement sensor and adjustment mechanism into the generator shaft current detection device, the problem of misalignment between the induction coil and the motor shaft was solved, achieving high-precision concentricity adjustment and improving detection accuracy and equipment stability.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-24
- Publication Date
- 2026-03-24
AI Technical Summary
Existing generator shaft current detection devices lack detection and adjustment structures during installation, which makes it easy for the motor shaft and induction coil to misalign, resulting in different shaft centers and affecting detection accuracy and equipment stability.
The design includes a shaft current detection induction coil, a controller, a fixing component, and an adjustment mechanism. The gap between the induction coil and the motor shaft is detected by a displacement sensor, and the horizontal and vertical positions of the induction coil are adjusted by the adjustment mechanism to make it concentric with the motor shaft, thereby improving assembly accuracy.
It improves the accuracy of shaft current detection, reduces detection errors and mechanical vibration, and enhances the stability and lifespan of the motor shaft.
Smart Images
Figure CN224035487U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of motor shaft current monitoring technology, and relates to a generator shaft current monitoring device. Background Technology
[0002] The main hazards of shaft current are the generation of small electric arcs that erode the oil film between the journal and the bearing, leading to increased bearing temperature and carbonization of the lubricating oil. If the shaft current exceeds a certain value, the sliding surfaces of the generator shaft journal and the bearing may be damaged, rendering the bearing unusable or significantly shortening its lifespan. Therefore, shaft current detection is crucial. Existing generator shaft current detection devices generally use the principle of electromagnetic induction. This type of device mounts an induction coil around the generator shaft and detects the shaft current through electromagnetic inductance. Compared to traditional carbon brush contact detection methods, this improves detection accuracy and reduces mechanical wear. However, existing generator shaft current detection devices typically use a fixed bracket to mount the induction coil on the generator shaft. This installation method, lacking appropriate detection and adjustment structures, allows the generator shaft and induction coil to shift during rotation due to mechanical vibration. This misalignment results in an asymmetrical magnetic field distribution, affecting the accuracy of current detection and potentially introducing errors. Furthermore, misalignment leads to mechanical imbalance, causing vibration and impacting the stability and lifespan of the equipment.
[0003] Therefore, this utility model provides a generator shaft current monitoring device to solve the above problems. Utility Model Content
[0004] In view of the problems existing in the prior art, this utility model discloses a generator shaft current monitoring device. The technical solution adopted includes a shaft current detection induction coil and a controller matched with the shaft current detection induction coil. The outer circumferential wall of the shaft current detection induction coil is provided with four first fixing ears arranged in a circumferential array. The first fixing ears are fixedly connected to the inner ring of the fixing component. The fixing component includes a fixing ring. The inner circumferential wall of the fixing ring is provided with second fixing ears corresponding to the first fixing ears arranged in a circumferential array. The second fixing ears are fixedly connected to the first fixing ears by bolts. The circumferential side wall of the fixing ring is also provided with four mounting holes arranged in a circumferential array. Displacement sensors are inserted into the mounting holes. The left and right sides of the outer circumferential side wall of the fixing ring are respectively fixedly connected to the first guide posts. The middle of the left and right first guide posts is fixedly fitted with a reinforcing plate. The center of the reinforcing plate is provided with a threaded hole. The lower part of the fixing component is movably connected to the adjustment mechanism through the first guide posts.
[0005] In a preferred embodiment of this utility model, the displacement sensors are located on the front side of the shaft current detection induction coil, and the detection ports of the displacement sensors are respectively facing the center of the shaft current detection induction coil.
[0006] In a preferred embodiment of this utility model, the adjustment mechanism includes an inverted first U-shaped bracket. The upper sides and middle of the first U-shaped bracket have through holes. The left and right through holes are respectively movably fitted with first guide posts. A first motor is installed at the lower part of the middle through hole. The output shaft of the first motor is fixedly connected to a first lead screw, which is inserted into the central threaded hole of the reinforcing plate. The lower end of the first U-shaped bracket is fixedly connected to an inverted second U-shaped bracket. The controller is installed at the upper right end of the second U-shaped bracket. Second through holes are symmetrically opened on the left and right sidewalls of the second U-shaped bracket. A slider is fixedly installed at the front middle part of the second U-shaped bracket. The second through holes on the left and right sides movably pass through the second guide post. The lead screw, with its rear left and right through holes, movably passes through the second guide post. The left and right ends of the second lead screw and second guide post are rotatably mounted on left and right fixed plates, respectively. The left and right fixed plates are fixedly mounted on the base plate, and the right side wall of the right fixed plate is fixedly mounted on the right side of the base plate. By employing an adjustment mechanism, the detection device can be mounted on the generator shaft. A displacement sensor on the fixed ring detects the gap between the shaft current detection coil and the motor shaft, thereby determining whether the shaft current detection coil and the motor shaft are concentric. If the concentricity exceeds the installation specifications, the shaft current detection coil can be adjusted horizontally and vertically using the adjustment mechanism, thus improving the concentricity between the shaft current detection coil and the motor shaft and increasing the detection accuracy.
[0007] In a preferred embodiment of this utility model, the output shaft of the second motor is fixedly connected to the second lead screw.
[0008] In a preferred embodiment of this utility model, the slider is mounted on the second lead screw.
[0009] As a preferred embodiment of this utility model, mounting holes are respectively opened at the four corners of the base plate, and a system controller is installed on the base plate on the front side of the second U-shaped bracket.
[0010] The beneficial effects of this utility model are as follows: By designing a displacement sensor on the circumferential sidewall of the shaft current detection induction coil, the distance to the motor shaft fitted inside the shaft current detection induction coil can be detected. The detection data of the displacement sensor is transmitted to the system controller. Through data processing by the system controller, the adjustment mechanism is controlled to adjust the horizontal and vertical positions of the shaft current detection induction coil relative to the generator shaft. This makes the shaft current detection induction coil and the generator shaft automatically concentric, improving the assembly accuracy of both. This reduces the detection error caused by uneven air gap between the induction coil and the motor shaft due to misalignment, which disrupts the symmetry of the annular magnetic field, thus improving the detection accuracy. At the same time, improving concentricity can further reduce the electromagnetic force imbalance caused by misalignment, which leads to power frequency vibration, reduces mechanical noise, and improves the stability of motor shaft operation. Attached Figure Description
[0011] Fig. 1 This is a schematic diagram of the overall structure of this utility model;
[0012] Fig. 2 This is a schematic diagram of the assembly of the shaft current detection inductor and the fixing assembly of this utility model;
[0013] Fig. 3 This is a schematic diagram of the adjustment mechanism of this utility model.
[0014] In the diagram: 1-Axis current detection induction coil, 2-Controller, 3-Fixing component, 4-Adjustment mechanism, 5-System controller, 11-First fixing ear, 31-Fixing ring, 32-Second fixing ear, 33-Displacement sensor, 34-First guide post, 35-Reinforcing plate, 41-First U-shaped bracket, 411-Through hole, 42-First motor, 43-First lead screw, 44-Second U-shaped bracket, 441-Second through hole, 442-Slider, 45-Second lead screw, 46-Second guide post, 47-Fixing plate, 48-Base plate, 481-Mounting hole, 49-Second motor. Detailed Implementation
[0015] Example 1
[0016] like Figs. 1 to 3As shown, the generator shaft current monitoring device of this utility model adopts the following technical solution: it includes a shaft current detection induction coil 1 and a controller 2 matched with the shaft current detection induction coil 1. The outer circumferential wall of the shaft current detection induction coil 1 is arranged with four first fixing ears 11 in a circumferential array. The first fixing ears 11 are fixedly connected to the inner ring of a fixing component 3. The fixing component 3 includes a fixing ring 31. The inner circumferential wall of the fixing ring 31 is arranged with second fixing ears 32 corresponding to the first fixing ears 11 in a circumferential array. The second fixing ears 32 are fixedly connected to the first fixing ears 11 by bolts. The circumferential sidewall of the fixing ring 31 is also circular. Four mounting holes are provided in the circumferential array. Displacement sensors 33 are inserted into these holes. The displacement sensors 33 are located on the front side of the shaft current detection induction coil 1, with their detection ports facing the center of the shaft current detection induction coil 1. First guide posts 34 are fixedly connected to the left and right sides of the outer circumferential wall of the fixing ring 31. A reinforcing plate 35 is fixedly fitted between the middle of the left and right first guide posts 34. A threaded hole is provided in the center of the reinforcing plate 35. The lower part of the fixing assembly 3 is movably connected to the adjustment mechanism 4 via the first guide posts 34. The adjustment mechanism 4 includes an inverted first U-shaped bracket 41. The upper end of the first U-shaped bracket 41... Through holes 411 are provided on both sides and in the middle. The first guide post 34 is movably inserted into the left and right through holes 411 respectively. A first motor 42 is installed at the lower part of the middle through hole 411. The output shaft of the first motor 42 is fixedly connected to a first lead screw 43, which is inserted into the central threaded hole of the reinforcing plate 35. The lower end of the first U-shaped bracket 41 is fixedly connected to an inverted second U-shaped bracket 44. The controller is installed on the upper right end of the second U-shaped bracket 44. Second through holes 441 are symmetrically opened on the left and right sidewalls of the second U-shaped bracket 44. A slider 442 is fixedly installed in the front middle part of the second U-shaped bracket 44. The slider 442 is mounted on the second lead screw 45. The second through holes 441 on the front left and right sides movably pass through the second lead screw 45, and the second through holes 441 on the rear left and right sides movably pass through the second guide post 46. The left and right ends of the second lead screw 45 and the second guide post 46 are respectively rotatably mounted on the left and right fixed plates 47. The left and right fixed plates 47 are respectively fixedly mounted on the base plate 48. The four corners of the base plate 48 are respectively provided with mounting holes 481. The right side wall of the right fixed plate 47 is fixedly mounted on the second motor 49. The output shaft of the second motor 49 is fixedly connected to the second lead screw 45. The system controller 5 is mounted on the base plate on the front side of the second U-shaped bracket 44.
[0017] The working principle of this utility model is as follows: In use, the shaft current detection induction coil 1 of the device is roughly fitted onto the generator shaft. It is then fixed to the fixed plate of the generator shaft with bolts through the mounting holes 481 on the base plate 48. Then, the displacement sensor 33 on the fixing ring 31 is activated to align it with the generator shaft. The data detected by the four displacement sensors 33 is transmitted to the system controller 5 for calculation. The system controller 5 then controls the first motor 42 and the second motor 49 to operate. The first motor 42 drives the first lead screw 43 to rotate, adjusting the reinforcing plate 35 to move up and down, which in turn drives the left and right first guide columns 34 to move up and down, thereby adjusting the position of the shaft current detection induction coil 1 relative to the vertical direction of the motor shaft. The second motor 49 drives the second lead screw 45 to rotate, which in turn drives the slider 442 to move left and right, thereby adjusting the position of the shaft current detection induction coil 1 relative to the horizontal direction of the motor shaft. This ensures that the shaft current detection induction coil 1 is concentric with the central axis of the motor shaft, improving the detection accuracy and the stability of mechanical operation.
[0018] Electrical connection methods or structures not described in detail in this article are existing technologies.
[0019] While the specific embodiments of this utility model have been described in detail above, this utility model is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of this utility model. Modifications or variations that do not involve creative labor are still within the protection scope of this utility model.
Claims
1. A generator shaft current monitoring device, comprising a shaft current detection induction coil (1) and a controller (2) matched with the shaft current detection induction coil (1), characterized in that: The outer circumferential wall of the shaft current detection sensing coil (1) is provided with four first fixing ears (11) arranged in a circumferential array. The first fixing ears (11) are fixedly connected to the inner ring of the fixing component (3). The fixing component (3) includes a fixing ring (31). The inner circumferential wall of the fixing ring (31) is provided with a second fixing ear (32) corresponding to the first fixing ear (11). The second fixing ear (32) is fixedly connected to the first fixing ear (11) by bolts. The circumferential side wall of the fixing ring (31) is also provided with four mounting holes arranged in a circumferential array. The displacement sensor (33) is inserted into the mounting holes. The left and right sides of the outer circumferential wall of the fixing ring (31) are respectively fixedly connected with first guide posts (34). The middle of the left and right first guide posts (34) is fixedly fitted with a reinforcing plate (35). The center of the reinforcing plate (35) is provided with a threaded hole. The lower part of the fixing component (3) is movably connected to the adjustment mechanism (4) through the first guide posts (34).
2. The generator shaft current monitoring device according to claim 1, characterized in that: The displacement sensors (33) are located on the front side of the shaft current detection induction coil (1), and the detection ports of the displacement sensors (33) are respectively facing the center of the shaft current detection induction coil (1).
3. The generator shaft current monitoring device according to claim 1, characterized in that: The adjustment mechanism (4) includes an inverted first U-shaped bracket (41). The upper sides and middle of the first U-shaped bracket (41) have through holes (411). The left and right through holes (411) are respectively movably fitted with the first guide post (34). A first motor (42) is installed at the lower part of the middle through hole (411). The output shaft of the first motor (42) is fixedly connected to a first lead screw (43). The first lead screw (43) is inserted into the central threaded hole of the reinforcing plate (35). The lower end of the first U-shaped bracket (41) is fixedly connected to an inverted second U-shaped bracket (44). The controller is installed at the upper right end of the second U-shaped bracket (44). The second U-shaped bracket (44) has symmetrical second through holes (441) on its left and right side walls. A slider (442) is fixedly installed in the middle of the second U-shaped bracket (44). The second through holes (441) on the front left and right sides pass through the second lead screw (45). The second through holes (441) on the rear left and right sides pass through the second guide post (46). The left and right ends of the second lead screw (45) and the second guide post (46) are rotatably installed on the left and right fixed plates (47) respectively. The left and right fixed plates (47) are fixedly installed on the base plate (48) respectively. The right side wall of the right fixed plate (47) is fixedly installed with the second motor (49).
4. The generator shaft current monitoring device according to claim 3, characterized in that: The output shaft of the second motor (49) is fixedly connected to the second lead screw (45).
5. The generator shaft current monitoring device according to claim 3, characterized in that: The slider (442) is mounted on the second lead screw (45).
6. The generator shaft current monitoring device according to claim 3, characterized in that: Mounting holes (481) are opened at the four corners of the base plate (48), and the system controller (5) is installed on the base plate on the front side of the second U-shaped bracket (44).