Stator Slot Wedge Looseness Simulation Device

Abstract

The present invention relates to a stator slot wedge loosening simulation device, comprising: a fixing component, on which the slot wedge is fixed; a lifting component, which matches the slot wedge and is used to drive the slot wedge to deform; and a measuring component, which is used to measure the deformation of the slot wedge. The above scheme provided by the present application gradually applies a force to the slot wedge through the lifting component, and then uses the measuring component to measure and read the deformation of the center point of the slot wedge, so that the deformation of the slot wedge can be easily achieved to various standards, thereby facilitating the calibration of the motor stator slot wedge loosening detector.

Description

Technical Field

[0001] The present invention relates to the technical field of electrical maintenance, and particularly to a stator slot wedge loosening simulation device. Background Art

[0002] During the operation of a motor, especially during a sudden short circuit, the interaction between the current in the stator coil and the transverse magnetic field in the stator slot causes the wire bars in the slot to bear a considerable electromagnetic force. The stator slot wedges will loosen under the long-term mechanical stress. During the long-term operation, due to the vibration of the iron core, the slight thermal expansion and contraction of the main insulation material, the mechanical vibration of the stator, the cooling air during the rotation of the rotor, and affected by various factors such as the material, process, and installation quality of the slot wedges, the slot wedges will become severely loose and partially fall off. To ensure the safe operation of the motor, the detection of slot wedge loosening is an important part of the regular maintenance of the motor.

[0003] Currently, the detection of stator slot wedge loosening at home and abroad is mainly carried out through a stator slot wedge loosening detector for a motor. For example, for an intelligent robot and a method for testing the tightness of a slot wedge with the application number 201710765655.1, it mainly detects by hitting the slot wedge with a hitting hammer.

[0004] As the number of detections increases, that is, as the number of times the hitting hammer hits the slot wedge increases, it will inevitably cause a decrease in the detection accuracy of the stator slot wedge loosening detector for the motor. To calibrate the detection accuracy of the stator slot wedge loosening detector for the motor, as shown in Figure 3 and Figure 4 traditionally, a spacer 02 is manually driven between the slot wedge 01 and the coil 03, and then a dial indicator 04 is used to measure the deformation of the center point of the slot wedge 01. When the center deformation is 0, the slot wedge loosening amount is unqualified. When the deformation is 0.22 mm, the slot wedge loosening amount is qualified. When the deformation is 0.29 mm, the slot wedge loosening amount is fully tightened. At this time, the three loosening amounts of the slot wedge are used to calibrate the hitting hammer, so that when the stator slot wedge loosening detector for the motor detects the corresponding deformation, it can accurately determine whether the slot wedge is loose.

[0005] However, since the force of manually driving the spacer is difficult to control, it will cause the deformation of the center point of the slot wedge to be inconvenient to accurately reach the above three standards, thus bringing inconvenience to the calibration of the stator slot wedge loosening detector for the motor. Summary of the Invention

[0006] Based on this, in view of the problem that when a spacer is manually driven, the deformation of the center point of the slot wedge is inconvenient to reach the calibration standard, it is necessary to provide a stator slot wedge loosening simulation device.

[0007] The present invention provides a stator slot wedge loosening simulation device, including:

[0008] A fixing assembly, on which the slot wedge is fixed;

[0009] A lifting member, the lifting member matches the slot wedge and is used to drive the slot wedge to deform;

[0010] A measuring piece is used to measure the deformation of the slot wedge.

[0011] The above-mentioned stator slot wedge loosening simulation device gradually applies force to the slot wedge through the lifting part, and then uses the measuring part to measure and read the deformation of the center point of the slot wedge, so that the deformation of the slot wedge can easily meet various standards, which is beneficial to the calibration of the motor stator slot wedge loosening detector.

[0012] In one of the embodiments, the fixing assembly includes a base plate and a dovetail groove, and the dovetail groove is fixed above the base plate;

[0013] The slot wedge and the lifting member are arranged in the dovetail slot in sequence from top to bottom, and the lower end of the lifting member abuts against the bottom plate, and the upper end of the lifting member abuts against the slot wedge.

[0014] In one embodiment, the dovetail groove is provided with a through trapezoidal groove and a square groove in sequence from top to bottom along the lifting direction of the lifting member;

[0015] The slot wedge is arranged in the trapezoidal slot, and the upper end of the lifting member abuts against the slot wedge after passing through the square slot.

[0016] In one of the embodiments, a spacer block is further included, and the spacer block is located between the lifting member and the slot wedge.

[0017] In one of the embodiments, the lifting member comprises a jack, and the jack is disposed on the base plate, and a lifting end of the jack abuts against a side of the cushion block away from the slot wedge.

[0018] In one of the embodiments, a slot is provided on a side of the base plate facing the cushion block, and the jack is disposed in the slot.

[0019] In one of the embodiments, a fixing seat is further included, and the measuring member is fixed above the dovetail groove through the fixing seat.

[0020] In one of the embodiments, the fixing base includes a magnetic base, and the measuring piece is fixed above the dovetail groove through the magnetic base.

[0021] In one of the embodiments, the measuring member is a dial indicator, and the lower end of the measuring rod on the dial indicator abuts against a side of the slot wedge facing away from the lifting member.

[0022] In one embodiment, the dovetail groove is fixed above the base plate by fastening bolts. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 FIG. 6 is a schematic structural diagram of a stator slot wedge loosening simulation device provided by an embodiment of the present invention;

[0024] Figure 2 is Figure 1 a schematic diagram of the dovetail groove in

[0025] Figure 3 FIG. 7 is a schematic diagram of an existing method for measuring slot wedge loosening;

[0026] Figure 4 is Figure 3 a schematic diagram of using a dial indicator to measure slot wedge loosening in DETAILED DESCRIPTION OF THE EMBODIMENTS

[0027] In order to make the above objects, features, and advantages of the present invention more apparent and understandable, the following detailed description of the specific embodiments of the present invention will be given with reference to the accompanying drawings. Many specific details are set forth in the following description in order to fully understand the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the spirit of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed below.

[0028] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention.

[0029] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present invention, "a plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0030] In the present invention, unless otherwise clearly defined or limited, terms such as "installed", "connected", "joined", "fixed", etc. shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the internal communication of two components or the interaction relationship between two components, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0031] In the present invention, unless otherwise clearly defined or limited, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0032] It should be noted that when an element is referred to as "fixed to" or "disposed on" another element, it may be directly on the other element or there may also be an intermediate element. When an element is considered to be "connected" to another element, it may be directly connected to the other element or there may be an intermediate element at the same time. The terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used herein are only for the purpose of illustration and do not represent the only implementation.

[0033] At present, the detection of the looseness of the motor stator slot wedge at home and abroad is mainly carried out by a motor stator slot wedge looseness detector. The motor stator slot wedge looseness detector uses a striking hammer to strike the slot wedge, and then a microphone acquires the sound wave generated when the striking hammer strikes the slot wedge, and converts the sound wave into an electrical signal. Finally, the electrical signal is subjected to spectral analysis, and the spectrum of the electrical signal is compared with the spectrum of a preset standard signal to determine whether the slot wedge is loose. However, with the increase in the number of detections, that is, the increase in the number of times the striking hammer strikes the slot wedge, it is inevitable that the detection accuracy of the motor stator slot wedge looseness detector will be reduced. In order to calibrate the detection accuracy of the motor stator slot wedge looseness detector, refer to Figure 3 and Figure 4As shown in the figure, the traditional method is to manually drive the spacer block 02 between the slot wedge 01 and the coil 03, and then use the dial indicator 04 to measure the deformation of the center point of the slot wedge 01. When the center deformation is 0, the looseness of the slot wedge is unqualified. When the deformation is 0.22 mm, the looseness of the slot wedge is qualified. When the deformation is 0.29 mm, the slot wedge is fully tightened. At this time, use the three looseness levels of the slot wedge to calibrate the striking hammer on the motor stator slot wedge looseness detector. That is, when the center deformation is 0, start the motor stator slot wedge looseness detector, so that the striking hammer on the motor stator slot wedge looseness detector strikes on the slot wedge 01. At this time, the electrical signal converted from the sound wave generated by the striking hammer striking on the slot wedge 01 is defined as the electrical signal with a center deformation of 0, and this electrical signal is saved. At this time, the looseness of the slot wedge is unqualified; when the center deformation is 0.22 mm, start the motor stator slot wedge looseness detector, so that the striking hammer on the motor stator slot wedge looseness detector strikes on the slot wedge 01. At this time, the electrical signal converted from the sound wave generated by the striking hammer striking on the slot wedge 01 is defined as the electrical signal with a center deformation of 0.22 mm, and this electrical signal is saved. At this time, the looseness of the slot wedge is qualified; when the center deformation is 0.29 mm, start the motor stator slot wedge looseness detector, so that the striking hammer on the motor stator slot wedge looseness detector strikes on the slot wedge 01. At this time, the electrical signal converted from the sound wave generated by the striking hammer striking on the slot wedge 01 is defined as the electrical signal with a center deformation of 0.29 mm, and this electrical signal is saved. At this time, the slot wedge is fully tightened.

[0034] After saving the above three standard electrical signals, then use the motor stator slot wedge looseness detector to detect the motor stator slot wedge to be detected, and compare the detection result with the above three standards to determine whether the slot wedge is loose.

[0035] However, the force of manually driving the spacer block is not easy to control, which will cause the deformation of the center point of the slot wedge to be inconvenient to accurately reach the above three standards, thus bringing inconvenience to the calibration of the motor stator slot wedge looseness detector.

[0036] To solve the above problems, as Figure 1 shown, in an embodiment of the present invention, a stator slot wedge looseness simulation device is provided, including a fixing component, a lifting member 30 and a measuring member 70. Among them, the slot wedge is fixed on the fixing component, the lifting member 30 is matched with the slot wedge and is used to drive the slot wedge to deform, and the measuring member 70 is used to measure the deformation of the slot wedge.

[0037] Adopting the above technical solution, by gradually applying a force to the slot wedge 60 through the lifting member 30 and then using the measuring member 70 to measure and read the deformation of the center point of the slot wedge 60, the deformation of the slot wedge 60 can be easily made to reach each standard, which is beneficial to the calibration of the motor stator slot wedge looseness detector.

[0038] In some embodiments, the above-mentioned fixing component includes a bottom plate 10 and a dovetail groove 20. Among them, the measuring member 70 is a dial indicator. The dovetail groove 20 is fixed above the bottom plate 10. The groove wedge 60 and the lifting member 30 are arranged in the dovetail groove 20 from top to bottom in sequence. The lower end of the lifting member 30 abuts against the bottom plate 10, and the upper end of the lifting member 30 abuts against the groove wedge 60. The measuring member 70 is arranged above the dovetail groove 20, and the lower end of the measuring rod on the dial indicator abuts against the side of the groove wedge 60 away from the lifting member 30.

[0039] Specifically, first start the lifting member 30 so that the upper end of the lifting member 30 acts on the groove wedge 60. When the measuring member 70 measures that the deformation amount of the center point of the groove wedge 60 is 0, the lifting member 30 stops moving. At this time, start the motor stator slot wedge looseness detector, so that the striking hammer on the motor stator slot wedge looseness detector strikes on the groove wedge 60. At this time, the electric signal converted from the sound wave generated when the striking hammer strikes on the groove wedge 60 is defined as the electric signal with a center deformation amount of 0, and this electric signal is saved. At the same time, define the slot wedge looseness amount at this time as unqualified;

[0040] After a standard calibration of the motor stator slot wedge looseness detector is completed, start the lifting member 30 again so that the upper end of the lifting member 30 continues to act on the groove wedge 60. When the measuring member 70 measures that the deformation amount of the center point of the groove wedge 60 is 0.22 mm, the lifting member 30 stops moving. At this time, start the motor stator slot wedge looseness detector, so that the striking hammer on the motor stator slot wedge looseness detector strikes on the groove wedge 60. At this time, the electric signal converted from the sound wave generated when the striking hammer strikes on the groove wedge 60 is defined as the electric signal with a center deformation amount of 0.22 mm, and this electric signal is saved. At the same time, define the slot wedge looseness amount at this time as qualified;

[0041] After the above two standard calibrations of the motor stator slot wedge looseness detector are completed, start the lifting member 30 again so that the upper end of the lifting member 30 continues to act on the groove wedge 60. When the measuring member 70 measures that the deformation amount of the center point of the groove wedge 60 is 0.29 mm, the lifting member 30 stops moving. At this time, start the motor stator slot wedge looseness detector, so that the striking hammer on the motor stator slot wedge looseness detector strikes on the groove wedge 60. At this time, the electric signal converted from the sound wave generated when the striking hammer strikes on the groove wedge 60 is defined as the electric signal with a center deformation amount of 0.29 mm, and this electric signal is saved. At the same time, define the slot wedge looseness amount at this time as fully tightened;

[0042] After saving the above three standard electric signals, then use the motor stator slot wedge looseness detector to detect the motor stator slot wedge to be detected, and compare the detection result with the above three standards to determine whether the slot wedge is loose.

[0043] It should be noted that the structure of the fixed component and the structure of the measuring piece including the dial indicator in the embodiment of the present application are only examples. In other alternative solutions, other structures can also be used. For example, the fixed component includes a clamp, and the slot wedge is clamped by the clamp. The measuring piece can also be an infrared measuring instrument, and the deformation of the slot wedge is measured by the infrared measuring instrument. The present application does not impose any special restrictions on the specific structure of the fixed component and the specific type of the measuring piece, as long as the above structure can achieve the purpose of the present application.

[0044] In some embodiments, Figure 2 As shown, the dovetail groove 20 in the present application is provided with a through trapezoidal groove 201 and a square groove 202 in sequence from top to bottom along the lifting direction of the lifting member 30; wherein, the slot wedge 60 is arranged in the trapezoidal groove 201, the lower end of the lifting member 30 abuts against the bottom plate 10, and the upper end of the lifting member 30 passes through the square groove 202 and abuts against the slot wedge 60.

[0045] Specifically, the side of the trapezoidal groove 201 away from the square groove 202 passes through the side of the dovetail groove 20 away from the bottom plate 10; the side of the square groove 202 away from the trapezoidal groove 201 passes through the side of the dovetail groove 20 toward the bottom plate 10, and the lifting member 30 is arranged on the bottom plate 10, and the upper end of the lifting member 30 passes through the square groove 202 and abuts against the slot wedge 60.

[0046] Further, the lifting member 30 is a jack, which is arranged on the bottom plate 10, and the lifting end of the jack passes through the square slot 202 and abuts against the slot wedge 60. When the lifting end of the jack rises, the center point of the slot wedge 60 can be changed.

[0047] It should be noted that the structure in which the center point of the slot wedge is moved by the jack in the embodiment of the present application is only an example. In other alternative solutions, other structures may also be used, for example, a motor-screw structure, in which the motor drives the screw to rotate, so that the screw nut on the screw acts on the slot wedge. The present application does not impose any special restrictions on the specific structure of the lifting member, as long as the above structure can achieve the purpose of the present application.

[0048] In some embodiments, since the side of the slot wedge 60 facing the lifting member 30 is an arc-shaped structure, in order to facilitate the lifting member 30, i.e., the upper end of the jack, to be pressed against the side of the arc-shaped structure on the slot wedge 60, the present application further includes a cushion block 50, such as Figure 1 As shown, the side of the pad 50 facing the slot wedge 60 is also an arc-shaped structure, and the side of the pad 50 facing away from the slot wedge 60 is a plane structure, and the arc-shaped structure on the pad 50 corresponds to the arc-shaped structure on the slot wedge 60. Therefore, by arranging the pad 50 between the lifting member 30 and the slot wedge 60, one side of the arc-shaped structure on the slot wedge 60 can be indirectly converted into a plane structure, which is beneficial for the lifting end on the jack to press against the slot wedge 60.

[0049] Furthermore, to facilitate the action of the jack on the groove wedge, the present application further includes a top block 40, which is arranged in the square groove 202 and is located between the spacer block 50 and the lifting member 30. When the lifting member 30 is activated, that is, when the jack works, its upper end can act on the groove wedge 60 after passing through the top block 40 and the spacer block 50.

[0050] In some embodiments, to facilitate placing the jack on the bottom plate 10, a card slot is provided on one side of the bottom plate 10 in the present application facing the top block 40, and the jack is arranged in the card slot.

[0051] It should be noted that the structure of fixing the jack on the bottom plate by providing a card slot in the embodiment of the present application is only an example. In other alternative solutions, other structures can also be adopted. For example, a magnetic base is fixed on the bottom plate, and the jack is fixed through the magnetic base. The present application does not impose special restrictions on the fixing structure of the jack and the bottom plate, as long as the above structure can achieve the purpose of the present application.

[0052] In some embodiments, as Figure 1 shown, to facilitate fixing the measuring member 70, that is, the dial indicator, on the dovetail groove 20, the present application further includes a fixing seat, and the measuring member 70 is fixed above the dovetail groove 20 through the fixing seat.

[0053] Specifically, the above fixing seat includes a magnetic dial gauge base 80. The dovetail groove 20 is an iron dovetail groove, and the magnetic dial gauge base 80 is fixed on the dovetail groove 20 by magnetism, and the measuring member 70 is fixed on the magnetic dial gauge base 80.

[0054] It should be noted that the structure of fixing the measuring member by the magnetic dial gauge base in the embodiment of the present application is only an example. In other alternative solutions, other structures can also be adopted. For example, a clamp is provided on the dovetail groove, and the measuring member is fixed on the clamp. The present application does not impose special restrictions on the connection structure for fixing the measuring member on the dovetail groove, as long as the above structure can achieve the purpose of the present application.

[0055] In some embodiments, as Figure 1 shown, the dovetail groove 20 in the present application is fixed above the bottom plate 10 through a fastening bolt 90.

[0056] Specifically, a threaded hole is provided on one side of the dovetail groove 20 facing the bottom plate 10, and a corresponding threaded hole is also provided on the bottom plate 10. After the bolt 90 passes through the threaded hole on the bottom plate 10 and the threaded hole on the dovetail groove 20 in sequence from below the bottom plate 10, the dovetail groove 20 can be fixed on the bottom plate 10.

[0057] It should be noted that the connection structure for fixing the dovetail groove to the bottom plate by bolts in the embodiments of the present application is only an example. In other alternative solutions, other structures can also be adopted. For example, a card slot can be provided on the bottom plate, and the dovetail groove is fixed in the card slot. The present application does not impose special restrictions on the connection structure between the dovetail groove and the bottom plate, as long as the above structure can achieve the purpose of the present application.

[0058] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered to be within the scope described in this specification.

[0059] The above-described embodiments only represent several implementation manners of the present invention. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the invention patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the invention patent should be subject to the appended claims.

Claims

1. A device for simulating the looseness of a stator wedge. It is characterized in that include: A fixing assembly, on which the slot wedge is fixed; A lifting member (30), the lifting member (30) matches the slot wedge and is used to drive the slot wedge to deform; A measuring member (70), the measuring member (70) being used to measure the deformation of the slot wedge; The lifting member (30) gradually applies a force to the slot wedge (60), and then the measuring member (70) is used to measure and read the deformation of the center point of the slot wedge (60), so that the deformation of the slot wedge (60) can easily meet various standards, thereby facilitating the calibration of the motor stator slot wedge loosening detector.

2. The stator wedge loosening simulation device according to claim 1, It is characterized in that The fixing assembly comprises a base plate (10) and a dovetail groove (20), wherein the dovetail groove (20) is fixed above the base plate (10); The slot wedge (60) and the lifting member (30) are arranged in the dovetail slot (20) in sequence from top to bottom, and the lower end of the lifting member (30) abuts against the bottom plate (10), and the upper end of the lifting member (30) abuts against the slot wedge (60).

3. The stator wedge loosening simulation device according to claim 2, It is characterized in that The dovetail groove (20) is provided with a through trapezoidal groove (201) and a square groove (202) in sequence from top to bottom along the lifting direction of the lifting member (30); The slot wedge (60) is arranged in the trapezoidal slot (201), and the upper end of the lifting member (30) passes through the square slot (202) and then abuts against the slot wedge (60).

4. The stator wedge loosening simulation device according to claim 3, It is characterized in that It also includes a cushion block (50), and the cushion block (50) is located between the lifting member (30) and the slot wedge (60).

5. The stator wedge loosening simulation device according to claim 4, It is characterized in that The lifting member (30) comprises a jack, which is arranged on the base plate (10), and the lifting end of the jack abuts against a side of the cushion block (50) facing away from the slot wedge (60).

6. The stator wedge loosening simulation device according to claim 5, It is characterized in that A slot is provided on one side of the bottom plate (10) facing the cushion block (50), and the jack is arranged in the slot.

7. The stator wedge loosening simulation device according to claim 2, It is characterized in that It also includes a fixing seat, through which the measuring piece (70) is fixed above the dovetail groove (20).

8. The stator wedge loosening simulation device according to claim 7, It is characterized in that The fixing seat comprises a magnetic seat (80), and the measuring piece (70) is fixed above the dovetail groove (20) via the magnetic seat (80).

9. The stator wedge loosening simulation device according to claim 8, It is characterized in that The measuring member (70) is a dial gauge, and the lower end of the measuring rod on the dial gauge abuts against a side of the slot wedge (60) facing away from the lifting member (30).

10. The stator slot wedge loosening simulation device according to claim 2, characterized in that, the dovetail groove (20) is fixed above the base plate (10) by fastening bolts (90).

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