Paint damage detection device and method for motor winding

Abstract

The invention provides a paint damage detection device and method for a motor winding, the paint damage detection device comprises a detector and a detection part, the detection part is electrically connected with the detector, and the detection part comprises a plurality of conductive first detection sheets; the plurality of first detection sheets are arranged at intervals around an axis and are kept relatively static; the length direction of the first detection sheet is the extension direction of the axis, and the width direction of the first detection sheet is perpendicular to the extension direction of the axis. When the paint damage detection device is used for carrying out paint damage detection on the motor winding, each first detection sheet is inserted into one slot, so that the first detection sheets can be used for detecting whether the surface of the motor winding forming the corresponding slot is damaged or not at the slot.

Description

Technical Field

[0001] The present invention belongs to the technical field of motors, and in particular relates to a paint damage detection device and method for motor windings. Background Art

[0002] In a motor, a slot is formed between two adjacent motor windings. Currently, when inspecting the motor winding for paint damage, only the surfaces of the motor winding at both ends of the motor's axial direction can be detected to see if there is paint damage, but it is difficult to inspect the surface of the motor winding at the slot. Summary of the invention

[0003] The object of the present invention is to provide a paint damage detection device and method for motor windings, aiming to perform paint damage detection on at least the surface of the motor winding located at the slot gap.

[0004] To achieve the above-mentioned purpose, the present invention provides a paint damage detection device for motor windings, comprising a detector and a detection part; the detection part is electrically connected to the detector and comprises a plurality of conductive first detection pieces; the plurality of first detection pieces are arranged at intervals around an axis and remain relatively stationary; the length direction of the first detection piece is the extension direction of the axis, and the width direction of the first detection piece is perpendicular to the extension direction of the axis.

[0005] Optionally, the detection unit further includes a conductive substrate, and all of the first detection sheets are connected to the substrate.

[0006] Optionally, the paint damage detection device further comprises an insulating substrate, and all the first detection sheets are connected to the substrate.

[0007] Optionally, the detection unit further includes a plurality of conductive second detection pieces, and opposite ends of each of the second detection pieces are respectively connected to two adjacent first detection pieces.

[0008] Optionally, the second detection piece is a curved structure with a middle portion convex in a direction away from the first detection piece.

[0009] Optionally, the paint damage detection device further includes a protective structure, and the protective structure is wrapped around the edge of the first detection sheet.

[0010] Optionally, the paint damage detection device further comprises a display, which is communicatively connected to the detector and is configured to receive and display alarm information generated by the detector.

[0011] Optionally, the paint damage detection device includes a driving mechanism, which can be connected to the detection part and is used to drive the detection part to move.

[0012] To achieve the above object, the present invention further provides a method for detecting paint damage on motor windings, wherein a slot is formed between two adjacent motor windings; the method for detecting paint damage is performed based on the aforementioned device for detecting paint damage on motor windings, and comprises:

[0013] Inserting a plurality of the first detection sheets into the respective slots of the motor;

[0014] Power is supplied to the motor, and at least the first detection sheet is used to detect whether there is damage on the surface of the motor winding located at the slot.

[0015] Optionally, the paint damage detection method for the motor winding further includes:

[0016] When damage is detected on the surface of the motor winding, an alarm message is generated and displayed.

[0017] Compared with the prior art, the paint damage detection device and method for motor windings of the present invention have the following advantages:

[0018] The aforementioned paint damage detection device for motor windings comprises a detector and a detection part, wherein the detection part is electrically connected to the detector and comprises a plurality of conductive first detection pieces; the plurality of first detection pieces are arranged at intervals around an axis and remain relatively stationary; the length direction of the first detection piece is the extension direction of the axis, and the width direction of the first detection piece is perpendicular to the extension direction of the axis. When the paint damage detection device is used to detect paint damage on the motor windings, each of the first detection pieces is inserted into one of the slots, thereby the first detection piece can be used to detect whether the surface of the motor winding forming the corresponding slot at the slot is damaged.

[0019] Furthermore, the first detection unit also includes a conductive substrate, and all the first detection pieces are connected to the substrate; when each of the first detection pieces is inserted into a slot, the substrate is located at one end of the motor, so that the substrate can be used to detect whether the surface of the motor winding at the end of the motor is damaged. Alternatively, the detection unit also includes a plurality of conductive second detection pieces, and the opposite ends of each second detection piece are respectively connected to two adjacent first detection pieces; when each of the first detection pieces is inserted into a slot, all of the second detection pieces are located at one end of the motor, and each of the second detection pieces is arranged corresponding to one of the motor windings, so each of the second detection pieces can detect whether the surface of the corresponding motor winding at the end of the motor is damaged.

[0020] Furthermore, when the detection part includes the second detection piece, and the second detection piece is a curved surface, so that each of the second detection pieces forms a U-shaped structure together with the two first detection pieces connected thereto, the distance from each part of the second detection piece to the surface of the corresponding motor winding is basically constant and meets the requirements, thereby more accurately detecting whether there is damage on the surface of the corresponding motor winding at the end of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The accompanying drawings are used to better understand the present invention and do not constitute an improper limitation of the present invention.

[0022] Figure 1 1 is a schematic structural diagram of a paint damage detection device for motor windings provided according to an embodiment of the present invention, wherein a protective structure is not shown in the figure;

[0023] Figure 2 1 is a partial structural schematic diagram of a paint damage detection device for motor windings provided by an embodiment of the present invention, wherein a protective structure is shown;

[0024] Figure 3 1 is a partial structural schematic diagram of a paint damage detection device for motor windings provided by an embodiment of the present invention, wherein a protective structure is not shown in the figure;

[0025] Figure 4 FIG. 1 is a partial structural diagram of a paint damage detection device for motor windings provided by an embodiment of the present invention, wherein a protective structure is shown, and Figure 4 The first test piece shown is Figure 2 Different.

[0026] [Description of reference numerals is as follows]:

[0027] 10-detector, 20-detection part, 100-first detection piece, 200-substrate, 300-protection structure, 400-second detection piece, 01-axis line. DETAILED DESCRIPTION

[0028] The following is an explanation of the embodiments of the present invention by specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the illustrations provided in the present embodiment only illustrate the basic concept of the present invention in a schematic manner, and only the components related to the present invention are shown in the figure instead of being drawn according to the number, shape and size of the components in the actual implementation. The type, quantity and proportion of each component in the actual implementation can be a random change, and the component layout type may also be more complicated.

[0029] In addition, each embodiment of the following description has one or more technical features, but this does not mean that the user of the present invention must implement all the technical features in any embodiment at the same time, or can only implement part or all of the technical features in different embodiments separately. In other words, under the premise that implementation is possible, those skilled in the art can selectively implement part or all of the technical features in any embodiment according to the disclosure of the present invention and according to the design specifications or implementation requirements, or selectively implement a combination of part or all of the technical features in multiple embodiments, thereby increasing the flexibility of the implementation of the present invention.

[0030] As used in this specification, the singular forms "one", "an" and "the" include plural objects, and the plural form "multiple" includes more than two objects, unless the content clearly indicates otherwise. As used in this specification, the term "or" is usually used in the sense of including "and / or", unless the content clearly indicates otherwise, and the terms "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection. It can be a mechanical connection or an electrical connection. It can be directly connected or indirectly connected through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. Relational terms such as the terms "first", "second", etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations, nor do they indicate or imply relative importance or implicitly indicate the number of technical features indicated. 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] The object of the present invention is to provide a paint damage detection device for motor windings, which can at least detect paint damage on the surface of the motor winding located at the slot.

[0032] In order to make the purpose, advantages and features of the present invention more clear, the present invention is further described in detail below with reference to the accompanying drawings. It should be noted that the drawings are all in very simplified form and in non-precise proportions, and are only used to conveniently and clearly assist in explaining the purpose of the embodiments of the present invention. The same or similar reference numerals in the drawings represent the same or similar components.

[0033] <Example 1>

[0034] Figure 1 FIG. 2 is a schematic diagram showing the structure of the paint damage detection device for motor windings provided in this embodiment. Figure 1 As shown, the paint damage detection device includes an electrically connected detector 10 and a detection unit 20. The detection unit 20 includes a plurality of first detection sheets 100, which are arranged at intervals around an axis 01, and the plurality of first detection sheets 100 remain relatively stationary. The length direction of the first detection sheet 100 is the extension direction of the axis 01, and the width direction of the first detection sheet 100 is perpendicular to the extension direction of the axis 01. The first detection sheet 100 is made of conductive material.

[0035] The paint damage detection device provided in this embodiment can detect paint damage on the surface of the motor winding located at the slot (i.e., the area between two adjacent motor windings). During the detection, each of the first detection pieces 100 is first inserted into one of the slots of the motor, and the distance between the first detection piece 100 and the motor winding is not greater than a predetermined value, and then the motor is powered on. If there is damage on the surface of the motor winding located at the slot, the motor winding discharges at the damaged part, and the current is conducted to the first detection piece 100 and detected by the detector 10 connected to the detection part 20. In other words, in the case where the paint damage detection device only includes the first detection piece 100, when the detector 10 detects that current flows through the detection part 20, it can be determined that there is damage on the surface of the motor winding located at the slot.

[0036] It should be understood that when the first detection piece 100 is inserted into the slot, the axis 01 extends along the axial direction of the motor, and the width direction of the first detection piece 100 is approximately the radial direction of the motor. Therefore, the width direction of the first detection piece 100 also intersects with the extension direction of the axis 01. The above-mentioned predetermined value can be 3mm.

[0037] Optionally, the paint damage detection device also includes a driving mechanism (not shown in the figure), which can be connected to the detection part 20 and is used to drive the detection part 20 to move, so as to automatically insert each first detection piece 100 into one of the slots when the paint damage detection of the motor winding begins, and automatically pull the first detection piece 100 out of the slot after the paint damage detection is completed.

[0038] Preferably, the paint damage detection device further comprises a substrate 200. In this embodiment, the substrate 200 can be made of insulating material. All the first detection sheets 100 are fixedly connected to the substrate 200 so that all the first detection sheets 100 remain relatively still. At the same time, all the first detection sheets 100 can be connected to the detector 10 through wires respectively. The driving mechanism can be connected to the substrate 200.

[0039] It can be understood that when the detector 10 detects that current flows through the detection part 20 (i.e., detects that the surface of the motor winding is damaged), the detector 10 can generate an alarm message. As an optional solution, the paint damage detection device also includes a display (not shown in the figure), which is communicatively connected to the detector 10 and is configured to receive and display the alarm message.

[0040] In addition, in a further preferred embodiment, the paint damage detection device further comprises: Figure 2 The protective structure 300 shown in the figure is wrapped around the edge of the first detection sheet 100 to prevent the edge of the first detection sheet 100 from cutting the surface of the motor winding when the first detection sheet 100 is inserted into the slot. The protective structure 300 can be made of any suitable polymer material. In other embodiments, such as Figure 4 As shown, the first detection sheet 100 includes a plurality of sub-detection sheets 110, and all the sub-detection sheets 110 of the same first detection sheet 100 are arranged at intervals and embedded in the protective structure 300. It should be understood that each of the sub-detection sheets 110 is partially exposed outside the protective structure 300, and the edge of each of the sub-detection sheets 110 constitutes a part of the edge of the first sub-detection sheet 100. In addition, all the sub-detection sheets 110 are electrically connected to the detector 10.

[0041] In practice, the length, width and thickness of the first detection sheet 100 are determined according to the size of the motor to be detected. In this embodiment, the length of the first detection sheet 100 is not less than the size of the motor winding in the axial direction of the motor. The width of the first detection sheet 100 is roughly equal to the size of the motor winding in the radial direction of the motor, and the thickness of the first detection sheet 100 is slightly smaller than the size of the slot in the direction perpendicular to the axial and radial directions of the motor. The thickness direction of the first detection sheet 100 is perpendicular to the length direction and width direction of the first detection sheet 100 at the same time. In addition, the number of the first detection sheets 100 is the same as the number of slots of the motor to be tested.

[0042] <Example 2>

[0043] The structure of the paint damage detection device of this embodiment can be referred to Figure 1 The difference between this embodiment and the first embodiment is that the substrate 200 in this embodiment is made of a conductive material, and the substrate 200 is connected to the detector 10. At this time, all the first detection sheets 100 can be indirectly connected to the detector 10 through the substrate 200. In addition, the detection unit 20 also includes the substrate 200.

[0044] In this embodiment, the substrate 200 can be used to detect paint damage on the surface of the motor winding at the end of the motor. The reason is that when each of the first detection sheets 100 is inserted into one of the slots, the substrate 200 is located at one end of the motor. As long as the distance between the substrate 200 and the surface of the motor winding at the corresponding end of the motor is not greater than the predetermined value, if there is damage on the surface of the motor winding at the corresponding end of the motor, when the motor is powered on, the motor winding discharges through the damaged position at the corresponding end of the motor, so that the current is transferred to the substrate 200 and can be detected by the detector 10.

[0045] That is to say, under the premise that the substrate 200 is conductive, the paint damage detection device can simultaneously detect the surface of the motor winding located at the end of the motor and the surface located at the slot, which greatly improves the detection rate of paint damage.

[0046] It should be noted that, in this embodiment, the driving mechanism is insulated from the substrate 200 to prevent the operation of the driving mechanism from being adversely affected by the current conducted from the damaged portion to the substrate 200 when the surface of the motor winding is damaged.

[0047] In this embodiment, the substrate 200 may be a circular or annular structure with the axis 01 as the axis, so that the width direction of the first detection sheet 100 is the radial direction of the substrate 200. The size of the substrate 200 and the size of the first detection sheet 100 are determined according to the size of the motor to be detected. For example, when the substrate 200 is an annular structure, the radius of the circle where the outer edge of the substrate 200 is located is not less than the distance from the side of the motor winding away from the axis of the motor to the axis of the motor, and the radius of the circle where the inner edge of the substrate 200 is located is not greater than the distance from the side of the motor winding close to the axis of the motor to the axis of the motor. The length of the first detection sheet 100 is not less than half of the size of the motor winding in the axial direction of the motor, the width of the first detection sheet 100 is approximately equal to the size of the motor winding in the radial direction of the motor, and the thickness of the first detection sheet 100 is slightly smaller than the size of the slot in the direction perpendicular to the axial and radial directions of the motor.

[0048] The two ends of the motor are respectively referred to as the first end and the second end. When the paint damage detection device provided in this embodiment is used to detect paint damage on the motor winding of the motor, the first detection piece 100 is first inserted into the slot from the first end of the motor, and the distance from the substrate 200 to the surface of the motor winding located at the first end of the motor is not greater than the predetermined value, and then the motor is powered to at least detect paint damage on the area of ​​the surface of the motor winding located at the slot close to the first end of the motor and the surface of the motor winding located at the first end of the motor. After that, the power supply to the motor is stopped, and the first detection piece 100 is pulled out of the slot, and then the first detection piece 100 is inserted into the slot from the second end of the motor, and the distance from the substrate 200 to the surface of the motor winding located at the second end of the motor is not greater than the predetermined value, and then the motor is powered to at least detect paint damage on the area of ​​the surface of the motor winding located at the slot close to the second end of the motor and the surface of the motor winding located at the second end of the motor.

[0049] <Example 3>

[0050] Please refer to Figure 3 The difference between this embodiment and the first embodiment is that the detection unit 20 further includes a plurality of second detection sheets 400, and the second detection sheets 400 are made of conductive materials. Each of the second detection sheets 400 has two opposite ends, and the opposite ends of the second detection sheets 400 are respectively connected to two adjacent first detection sheets 100. All the second detection sheets 400 are electrically connected to the detector 100.

[0051] Those skilled in the art can understand that, when the first detection piece 100 is inserted into the slot of the motor, each of the second detection pieces 400 is located at the first end of the motor and is arranged corresponding to one of the motor windings between two adjacent first detection pieces 100. Therefore, each of the second detection pieces 400 can detect whether there is paint damage on the surface of the corresponding motor winding located at the end of the motor.

[0052] In some optional examples, the second detection sheet 400 is a planar sheet structure, and the structure formed by the second detection sheet 400 and the two first detection sheets 100 connected thereto is a П structure in a cross section parallel to the axis 01.

[0053] In some other optional examples, the second detection sheet 400 is a curved sheet structure with a central portion protruding in a direction away from the first detection sheet 100. The structure formed by the second detection sheet 400 and the two first detection sheets 100 connected thereto is U-shaped in a cross section parallel to the axis 01. The U-shape is adapted to the external shape of the enameled wire of the motor winding and maintains a certain interval. The advantage of the second detection sheet 400 of this structure is that it is more adaptable to the shape of the motor winding, so that the distance from each position of the second detection sheet 400 to the surface of the motor winding at the end of the motor is basically constant, which is conducive to improving the detection rate of paint damage.

[0054] In this embodiment, the sizes of the first detection sheet 100 and the second detection sheet 400 are determined according to the size of the motor to be detected. Specifically, the length of the first detection sheet 100 is not less than half of the size of the motor winding in the axial direction of the motor, the width of the first detection sheet 100 is approximately equal to the size of the motor winding in the radial direction of the motor, and the thickness of the first detection sheet 100 is slightly smaller than the size of the slot in the direction perpendicular to the axial and radial directions of the motor; the arc length of the second detection sheet 400 is determined according to the radius of the motor winding, and the width of the second detection sheet 400 is approximately equal to the size of the motor winding in the radial direction of the motor. The width direction of the second detection sheet 400 is the same as the width direction of the first detection sheet 100, that is, the width direction of the second detection sheet 400 is perpendicular to the extension direction of the axis 01 and intersects with the extension direction of the axis 01.

[0055] In addition, in this embodiment, when the paint damage detection device includes the substrate 200, the substrate 200 can be made of a conductive material or an insulating material.

[0056] The two axial ends of the motor are respectively referred to as the first end and the second end. When the paint damage detection device provided in this embodiment is used to detect paint damage on the motor winding of the motor, the first detection piece 100 is first inserted into the slot from the first end of the motor, and the distance between each second detection piece 100 and the surface of the corresponding motor winding located at the first end of the motor is not greater than the predetermined value, and then the motor is powered, so that at least the portion of the surface of the motor winding located at the slot close to the first end of the motor and the surface of the motor winding located at the first end of the motor can be tested for paint damage. After that, the power supply to the motor is stopped, and the first detection piece 100 is pulled out of the slot, and then the first detection piece 100 is inserted into the slot from the second end of the motor, and the distance between the second detection piece 400 and the surface of the corresponding motor winding located at the second end of the motor is not greater than the predetermined value, and then the motor is powered, so that at least the portion of the surface of the motor winding located at the slot close to the second end of the motor and the surface of the motor winding located at the second end of the lower level can be tested for paint damage.

[0057] <Example 4>

[0058] This embodiment provides a method for detecting paint damage on motor windings. The paint damage detection method is performed based on the paint damage detection device provided by any one of the aforementioned embodiments 1, 2, and 3, and includes at least the following steps:

[0059] Inserting a plurality of the first detection sheets 100 into the respective slots of the motor;

[0060] Power is supplied to the motor, and the first detection sheet 100 is used to detect whether there is any damage on the surface of the motor winding located at the slot.

[0061] It can be understood that when the paint damage detection device also includes the conductive substrate 200, or includes the second detection sheet 400, the paint damage detection method also includes using the conductive substrate 200 or the second detection sheet 400 to detect whether there is damage on the surface of the motor winding at the end of the motor.

[0062] When the paint damage detection device does not include a conductive substrate and does not include a second detection sheet, the paint damage detection method may further include using a paint damage detection device in the prior art to detect whether there is damage on the surface of the motor winding at the end of the motor.

[0063] Furthermore, in the case where the paint damage detection device also includes a display, the paint damage detection method also includes generating and displaying an alarm message when damage is detected on the surface of the motor winding.

[0064] It is estimated that when the paint damage detection device provided in Example 1 is used in combination with the paint damage detection device in the prior art, or the paint damage detection device provided in one of Example 2 and Example 3 is directly used to detect paint damage on the surface of the motor winding located at the slot and the surface of the motor winding at the end of the motor, the paint damage detection rate can be increased by more than 70% compared with the prior art that only detects paint damage on the surface of the motor winding at the end of the motor. For example, if the motor is applied to a compressor and 300 units of the compressor are returned inside and outside the factory per month, the increase in the paint damage detection rate can reduce the manufacturer's machine scrapping amount by 70%*300 ((unit)*compressor price), which can greatly reduce losses such as off-site customer returns.

[0065] In addition, in the prior art, in order to solve the problem of difficulty in detecting whether there is paint damage on the surface of the motor winding located at the slot gap, manufacturers generally set a slot wedge at the slot gap to electrically isolate the possible paint damage. The application of the paint damage detection device provided in the embodiment of the present invention realizes the paint damage detection on the surface of the motor winding located at the slot gap, so that the slot wedge can be eliminated, which further reduces the production cost of the motor.

[0066] Although the present invention is disclosed as above, it is not limited thereto. Those skilled in the art may make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A paint damage detection device for motor windings, characterized in that: It includes a detector and a detection part; the detection part is electrically connected to the detector and includes a plurality of first conductive detection pieces; the plurality of first detection pieces are arranged at intervals around an axis and remain relatively still; the length direction of the first detection piece is the extension direction of the axis, and the width direction of the first detection piece is perpendicular to the extension direction of the axis.

2. The paint damage detection device for motor windings according to claim 1, characterized in that: The detection part also includes a conductive substrate, and all the first detection sheets are connected to the substrate.

3. The paint damage detection device for motor windings according to claim 1, characterized in that: The paint damage detection device also includes an insulating substrate, and all the first detection sheets are connected to the substrate.

4. The paint damage detection device for motor windings according to any one of claims 1 to 3, characterized in that: The detection unit further includes a plurality of conductive second detection pieces, and opposite ends of each of the second detection pieces are respectively connected to two adjacent first detection pieces.

5. The paint damage detection device for motor windings according to claim 4, characterized in that: The second detection piece is a curved structure with a middle portion convex in a direction away from the first detection piece.

6. The paint damage detection device for motor windings according to claim 1, characterized in that: The paint damage detection device further includes a protection structure, which is wrapped around the edge of the first detection sheet.

7. The paint damage detection device for motor windings according to claim 1, characterized in that: The paint damage detection device also includes a display, which is communicatively connected to the detector and is configured to receive and display alarm information generated by the detector.

8. The paint damage detection device for motor windings according to claim 1, characterized in that: The paint damage detection device comprises a driving mechanism, which can be connected to the detection part and is used to drive the detection part to move.

9. A method for detecting paint damage on motor windings, wherein a slot is formed between two adjacent motor windings; characterized in that: The paint damage detection method is performed based on the paint damage detection device for motor windings according to any one of claims 1 to 8, and comprises: Inserting a plurality of the first detection sheets into the respective slots of the motor; Power is supplied to the motor, and at least the first detection sheet is used to detect whether there is damage on the surface of the motor winding located at the slot.

10. The paint damage detection method for motor windings according to claim 9, characterized in that: The paint damage detection method for the motor winding also includes: When damage is detected on the surface of the motor winding, an alarm message is generated and displayed.

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