Test conducting bar, motor rotor and motor
By embedding a thin strip simulation block made of non-conductive and non-magnetic material into the conductor bar, the problems of thin strips and broken strips during the casting process are solved, enabling accurate testing and quality control of the motor rotor.
Patent Information
- Application Number
- CN202520269947.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-19
- Publication Date
- 2025-12-23
- Estimated Expiration
- 2035-02-19
AI Technical Summary
In the casting process, existing asynchronous motor rotors are prone to defects such as thin strips and broken strips, which leads to inaccurate waveform amplitude judgment and makes it difficult to obtain an accurate relationship between thin strip ratio and waveform amplitude.
The thin strip simulation block, made of non-conductive and non-magnetic material, is integrally formed with the guide strip body. Porosity defects are eliminated by casting or 3D printing technology, and it is embedded in a specific position to control the thin strip ratio, thus making a test guide strip for motor rotor testing.
It effectively obtains the accurate relationship between the leanness ratio and the waveform amplitude, provides accurate test criteria, and provides reliable quality control for the production of rotors in mass production.
Smart Images
Figure CN223713116U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of motor technology, and in particular to a test guide bar, a motor rotor, and a motor. Background Technology
[0002] There are generally two methods for manufacturing asynchronous motor rotors: insert-type and casting-type. Insert-type rotors use pre-machined guide bars inserted into the rotor slots, and end rings are welded together on both sides of the rotor. Casting-type rotors, on the other hand, involve pouring high-temperature molten metal into the rotor slots and casting the guide bars and end rings as a single piece. Insert-type rotors can have guide bars that are either cast or forged, and they rarely have defects such as porosity. However, the manufacturing process is complex and the cost is higher. Cast rotors, however, are prone to porosity in the guide bars, resulting in broken bars and thin bars. Thin bars indicate casting defects, such as internal porosity, causing the actual volume of a certain part of the guide bar to be smaller than the theoretical volume (i.e., thinner). In most cases, thin bars do not extend along the entire axial direction of the guide bar. Broken bars refer to localized fractures caused by casting defects, resulting in the guide bar splitting into two or more segments along the axial direction.
[0003] Because casting is a low-cost method, mass production is possible. After the motor rotor is machined, a broken / thin strip detector is used to check for unacceptable manufacturing defects in the rotor bars. When broken strips are present, a clear waveform change can be seen in the output waveform of the broken / thin strip detector; while when thin strips are present, only the amplitude of a few waveforms changes. Therefore, broken strips are relatively easy to identify because the detected waveforms will show obvious differences; however, thin strips are often judged based on experience, and it is impossible to truly obtain an accurate relationship between the thin strip ratio and the waveform amplitude, which may lead to misjudgment in actual production.
[0004] Therefore, a test guide bar, motor rotor, and motor are needed to solve the above problems. Utility Model Content
[0005] The purpose of this invention is to provide a test guide bar, motor rotor, and motor that can effectively obtain the accurate relationship between the leanness ratio and waveform amplitude. The collected waveform data can provide test criteria when the rotors are mass-produced.
[0006] To achieve this objective, the present invention adopts the following technical solution:
[0007] Test strips, including:
[0008] The guide bar body extends along the first direction;
[0009] The thin strip simulation block is made of non-conductive and non-magnetic material, and the melting point of the thin strip simulation block is higher than that of the conductor strip body. The thin strip simulation block is embedded in the conductor strip body and is integrally formed with the conductor strip body.
[0010] In some embodiments, the number of the thin strip simulation blocks is at least two, and the at least two thin strip simulation blocks are spaced apart and embedded in the guide strip body along the first direction.
[0011] In some embodiments, the thin strip simulation block is cylindrical, spherical, conical, or prismatic.
[0012] In some embodiments, the thin strip simulation block is integrally cast with the guide strip body.
[0013] In some embodiments, the material of the thin strip simulation block is ceramic.
[0014] The motor rotor includes a shaft, two end rings, and multiple guide bars. At least one of the multiple guide bars is a test guide bar as described above. The multiple guide bars are arranged on the shaft along its axial direction. The two end rings are sleeved on both ends of the shaft, and the end rings are electrically connected to the ends of the guide bars.
[0015] In some embodiments, the remaining bars besides the test bar are connecting bars, which are formed by casting or forging.
[0016] In some embodiments, the plurality of connecting strips and the plurality of test strips are arranged in a non-alternating manner.
[0017] In some embodiments, the circumferential surface of the rotating shaft is provided with a plurality of slots at equal intervals, and the connecting guide bar and the test guide bar are inserted into the slots.
[0018] An electric motor, including an electric motor rotor as described above.
[0019] The beneficial effects of this utility model are:
[0020] This invention provides a test guide bar, in which the guide bar body extends along a first direction, and a thin strip simulation block made of non-conductive and non-magnetic material is embedded within the guide bar body. The thin strip simulation block is integrally formed with the guide bar body. Since the melting point of the thin strip simulation block is higher than that of the guide bar body, the thin strip simulation block will not melt during the casting process of the test guide bar. Moreover, by adopting an integral molding process, defects such as porosity in the guide bar body can be eliminated. Only the thin strip simulation block simulates thin strips in the test guide bar, allowing the thin strip ratio of the test guide bar to be controlled as needed. Furthermore, the thin strip simulation block can be embedded at any position in the guide bar body during the manufacturing process, so that the entire test guide bar, except for the thin strip simulation block, can be considered to be a metal material with a good filling rate. The shape and volume of the thin strip simulation block can be artificially processed as needed, thus obtaining a special guide bar with a specific thin strip ratio. These test guide bars can then be used to manufacture test motor rotors for testing. This effectively obtains the accurate relationship between the thin strip ratio and the waveform amplitude, and the collected waveform data can provide testing criteria for rotors manufactured in batches.
[0021] The present invention provides a motor rotor, including a shaft, two end rings and multiple guide bars. By testing the motor rotor with a strip breakage detector, the accurate relationship between strip breakage rate and waveform amplitude can be effectively obtained. The collected waveform data can provide testing criteria when rotors manufactured in batches are off the production line.
[0022] The present invention provides an electric motor, including the motor rotor as described above. By testing the motor rotor with a strip breakage detector, the accurate relationship between strip breakage rate and waveform amplitude can be effectively obtained. The collected waveform data can provide a criterion for testing when rotors manufactured in batches are off the production line. Attached Figure Description
[0023] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the content of the embodiments of this utility model and these drawings without creative effort.
[0024] Figure 1 This is a schematic diagram of a test guide bar according to the present invention;
[0025] Figure 2 This is a cross-sectional view of a test guide bar according to this utility model;
[0026] Figure 3 This is a cross-sectional view of another test guide bar of this utility model;
[0027] Figure 4This is a schematic diagram of a test guide bar in which the thin strip simulation block is conical in shape.
[0028] Figure 5 This is a schematic diagram of a cylindrical simulated thin strip block in a test guide bar according to this utility model;
[0029] Figure 6 This is a schematic diagram of a test guide bar in which the thin strip simulation block is spherical in shape.
[0030] Figure 7 This is a schematic diagram of a rectangular parallelepiped-shaped simulated thin strip in a test guide bar according to this utility model;
[0031] Figure 8 This is a schematic diagram of an irregularly shaped thin strip simulation block in a test guide bar according to this utility model;
[0032] Figure 9 This is a schematic diagram of a test guide bar in which the thin strip simulation block has another irregular shape;
[0033] Figure 10 This is a schematic diagram of a test guide bar in which the thin strip simulation block has another irregular shape;
[0034] Figure 11 This is a front view of the rotating shaft of a motor rotor according to this utility model.
[0035] In the picture:
[0036] 1. Test guide bar; 11. Guide bar body; 12. Thin bar simulation block; 2. Shaft; 21. Slot. Detailed Implementation
[0037] Before explaining any embodiment of the present invention in detail, it should be understood that the present invention is not limited to its application to the structural details and component arrangements set forth in the following description or shown in the above drawings.
[0038] In this invention, the terms "comprising," "including," "having," or any other variations thereof are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.
[0039] In this utility model, the terms "connection," "combination," and "installation" can refer to direct connection, combination, or installation, or indirect connection, combination, or installation. For example, a direct connection refers to two parts or components being connected together without the need for an intermediary, while an indirect connection refers to two parts or components each being connected to at least one intermediary, with the connection achieved through the intermediary.
[0040] In this invention, those skilled in the art will understand that the function performed by a component can be performed by one component, multiple components, one part, or multiple parts. Similarly, the function performed by a part can be performed by one part, one component, or a combination of multiple parts.
[0041] In this utility model, the directional terms "upper," "lower," "left," "right," "front," and "rear" are used to describe the orientation and positional relationships shown in the accompanying drawings and should not be construed as limiting the embodiments of this utility model. Furthermore, in the context, it should be understood that when one element is mentioned as being connected "upper" or "lower" to another element, it can be directly connected to the other element "upper" or "lower," or indirectly connected through an intermediate element. It should also be understood that directional terms such as upper side, lower side, left side, right side, front side, and rear side not only represent the direct orientation but can also be understood as the lateral orientation. For example, "below" can include directly below, lower left, lower right, lower front, and lower rear.
[0042] In the manufacturing process of motor rotors using casting technology, in order to effectively obtain the accurate relationship between the leanness ratio and waveform amplitude, the collected waveform data can provide testing criteria for the batch-manufactured rotors before they leave the production line. Figures 1-11 As shown, this utility model provides a test guide bar. The test guide bar 1 includes a guide bar body 11 and a thin bar simulation block 12.
[0043] The conductor body 11 extends along the first direction, the thin strip simulation block 12 is made of non-conductive and non-magnetic material, and the melting point of the thin strip simulation block 12 is higher than the melting point of the conductor body 11. The thin strip simulation block 12 is embedded in the conductor body 11, and the thin strip simulation block 12 and the conductor body 11 are integrally formed.
[0044] Because the melting point of the thin strip simulation block 12 is higher than that of the guide bar body 11, the thin strip simulation block 12 will not melt during the casting process of the test guide bar 1. Furthermore, by employing a one-piece molding process, such as casting or 3D printing, defects such as porosity in the guide bar body 11 can be eliminated. Only the thin strip simulation block 12 simulates thin strips in the test guide bar 1, allowing for control of the thin strip ratio as needed. Moreover, the thin strip simulation block 12 can be embedded at any position in the guide bar body 11 during the manufacturing process, thus ensuring that the entire test guide bar 1, except for the thin strip simulation block 12, is composed of well-filled metal material. The shape and volume of the thin strip simulation block 12 can be customized to obtain a special guide bar with a specific thin strip ratio. These test guide bars 1 can then be used to fabricate test motor rotors for testing. This effectively obtains the accurate relationship between the thin strip ratio and the waveform amplitude, and the collected waveform data can provide testing criteria for mass-produced rotors.
[0045] In some embodiments, at least two thin strip simulation blocks 12 are provided, and these at least two thin strip simulation blocks 12 are spaced apart and embedded in the guide strip body 11 along a first direction. Specifically, the volume of the thin strip simulation blocks 12 located at different positions in the guide strip body 11 can be controlled according to actual needs, thereby simulating the state of different sized pores at different positions in the guide strip body 11. In other embodiments, only one thin strip simulation block 12 can be arranged to simulate the state of the guide strip body 11 having only one pore.
[0046] like Figures 4-7 As shown, in some embodiments, the thin strip simulation block 12 is cylindrical, spherical, conical, or prismatic. By designing the thin strip simulation block 12 as cylindrical, spherical, conical, or prismatic, it is possible to simulate that the guide strip body 11 has pores similar to those in cylindrical, spherical, conical, or prismatic shapes. Through subsequent testing, the accurate relationship between the thin strip ratio and waveform amplitude of the test guide strip 1 with cylindrical, spherical, conical, or prismatic shapes can be obtained. Moreover, according to the needs of the testers, thin strip simulation blocks 12 with cylindrical, spherical, conical, or prismatic shapes can be mixed and used to further simulate test guide strips 1 with different pore shapes.
[0047] like Figures 8-10 As shown, in some embodiments, the thin strip simulation block 12 has an irregular shape. Since guide bars can have irregular pores during the casting process, by designing the thin strip simulation block 12 as an irregular shape and embedding it into the guide bar body 11, guide bars with irregular pores can be effectively simulated. The shape of the thin strip simulation block 12 can be arbitrary, and its volume and position within the guide bar body 11 can be configured as needed.
[0048] In some embodiments, the thin strip simulation block 12 is integrally cast with the guide strip body 11. By employing casting, the thin strip simulation block 12 can be embedded at any position on the guide strip body 11 as needed, and defects such as pores in the guide strip body 11 can be eliminated, ensuring the accuracy of subsequent tests. In other embodiments, it can also be manufactured using 3D printing technology; no further limitations are imposed here.
[0049] In some embodiments, the thin strip simulation block 12 is made of ceramic. Because ceramics are heat-resistant, non-conductive, and non-magnetic, and are easy to manufacture, they are well-suited for use as the thin strip simulation block 12. In other embodiments, the thin strip simulation block 12 can also be made of heat-resistant, non-conductive, and non-magnetic materials such as polytetrafluoroethylene; no further limitations are imposed here.
[0050] This embodiment also provides a motor rotor, which includes a rotating shaft 2, two end rings, and multiple guide bars. At least one of the multiple guide bars is a test guide bar 1 as described above. The multiple guide bars are arranged axially on the rotating shaft 2. The two end rings are sleeved on both ends of the rotating shaft 2, and the end rings are electrically connected to the ends of the guide bars. With the above arrangement, the number of test guide bars 1 can be configured according to actual testing needs. Subsequent testing can effectively obtain the accurate relationship between the leanness ratio and the waveform amplitude. The collected waveform data can provide testing criteria when the rotors are mass-produced.
[0051] like Figure 11 As shown, in some embodiments, the remaining guide bars besides test guide bar 1 are connecting guide bars, which are made by casting or forging. Because the connecting guide bars are cast or forged, they are virtually free of defects such as porosity. During the testing of the motor rotor using a thin strip detector, the test guide bar 1 with a pre-set thin strip ratio can be tested, effectively obtaining the accurate relationship between the thin strip ratio and the waveform amplitude. The collected waveform data can provide testing criteria for rotors manufactured in batches.
[0052] In some embodiments, the multiple connecting guides and multiple test guides 1 are arranged in a non-alternating manner. Alternating arrangement of connecting guides and multiple test guides 1 means arranging them in a sequence of connecting guides, test guides 1, connecting guides, test guides 1. Since such an alternating arrangement is almost impossible, the non-alternating arrangement of multiple connecting guides and multiple test guides 1 used in this application more realistically simulates actual conditions. Specifically, the multiple connecting guides and multiple test guides 1 are arranged in a non-alternating manner according to the needs of the testers. Through this method, motor rotors with different numbers of test guides 1 and different arrangement forms can be effectively simulated.
[0053] In some embodiments, a plurality of slots 21 are equally spaced on the circumferential surface of the rotating shaft 2, and the connecting guide bar and the test guide bar 1 are inserted into the slots 21. In this embodiment, the cross-sections of the connecting guide bar and the test guide bar 1 are both isosceles trapezoidal, and the slots 21 on the rotating shaft 2 are also trapezoidal grooves, which facilitates the installation of the connecting guide bar and the test guide bar 1, and can limit the connecting guide bar and the test guide bar 1 in the radial direction.
[0054] This embodiment also provides an electric motor, which includes the motor rotor as described above. The motor manufactured using the above-described motor rotor can be tested for output torque and rotor rotational smoothness, providing testing criteria for mass-produced rotors.
[0055] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.
Claims
1. A test guide strip, characterized in that, include: The guide bar body (11) extends along the first direction; The thin strip simulation block (12) is made of non-conductive and non-magnetic material, and the melting point of the thin strip simulation block (12) is higher than the melting point of the conductor body (11). The thin strip simulation block (12) is embedded in the conductor body (11), and the thin strip simulation block (12) and the conductor body (11) are integrally formed.
2. The test guide bar according to claim 1, characterized in that, The number of the thin strip simulation blocks (12) is at least two, and at least two of the thin strip simulation blocks (12) are embedded in the guide strip body (11) at intervals along the first direction.
3. The test strip according to any one of claims 1-2, characterized in that, The thin strip simulation block (12) is cylindrical, spherical, conical or prismatic.
4. The test strip according to any one of claims 1-2, characterized in that, The thin strip simulation block (12) and the guide strip body (11) are cast as a single unit.
5. The test strip according to any one of claims 1-2, characterized in that, The material of the thin strip simulation block (12) is ceramic.
6. An electric motor rotor, characterized in that, It includes a rotating shaft (2), two end rings and multiple guide bars, at least one of the multiple guide bars is a test guide bar as described in any one of claims 1-5, the multiple guide bars are arranged on the rotating shaft (2) along the axial direction of the rotating shaft (2), the two end rings are sleeved on both ends of the rotating shaft (2), and the end rings are electrically connected to the ends of the guide bars.
7. The motor rotor according to claim 6, characterized in that, Apart from the test guide bar (1), the other guide bars are connecting guide bars, which are formed by casting or forging.
8. The motor rotor according to claim 7, characterized in that, The multiple connecting strips and the multiple test strips (1) are arranged in a non-alternating manner.
9. The motor rotor according to any one of claims 7-8, characterized in that, The circumference of the rotating shaft (2) is provided with a plurality of slots (21) at equal intervals, and the connecting guide bar and the test guide bar are inserted into the slots (21).
10. An electric motor, characterized in that, Includes the motor rotor as described in any one of claims 6-9.