Evaluation device and evaluation method
By arranging the winding section with an open gap on the column of the magnetic core and using a measuring device, the problem of difficult measurement of column vibration was solved, and accurate measurement of column vibration and noise reduction were achieved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- NIPPON STEEL CORPORATION
- Filing Date
- 2024-07-16
- Publication Date
- 2026-05-12
AI Technical Summary
In the prior art, the column portion of the magnetic core may generate particularly large vibrations due to the magnetization and current action of the winding portion, leading to noise problems, but it is difficult to effectively measure these vibrations.
An evaluation device was designed, including a magnetic core, multiple winding sections, and a measuring device. The winding sections are arranged with open gaps along the axial direction of the column, and the vibration of the column is measured by the measuring device. The vibration in the out-of-plane, in-plane, and depth directions is measured by utilizing the gaps between the winding sections.
It can accurately measure the vibration of the column where the winding section is installed, helping to reduce equipment noise, and can reproduce the vibration measurement under actual use conditions.
Smart Images
Figure CN122029409A_ABST
Abstract
Description
Technical Field
[0001] This disclosure relates to an evaluation apparatus and method for evaluating the vibration of magnetic materials. Background Technology
[0002] It is known that when magnetic materials are magnetized, a phenomenon called magnetostriction occurs, where the dimensions of the magnetic material change according to the strength of the magnetic field. For example, in equipment such as transformers, an alternating magnetic field is generated in the magnetic core made of magnetic material due to the alternating current flowing in the excitation coil, causing the magnetostriction (stretching) in the core to vary periodically. This magnetostriction phenomenon can be a major cause of core vibration. Core vibration can lead to vibration and noise in equipment containing the core. By evaluating the vibration of the magnetic material constituting the core, it is possible to propose devices that reduce noise.
[0003] For example, Non-Patent Document 1 discloses measuring the vibration of a magnetic core in order to analyze the effect of magnetic materials on the noise of a transformer. In Non-Patent Document 1, for a model transformer with a three-phase, three-column magnetic core, the vibration of the magnetic core's yoke and the joint between the yoke and the column is measured using a laser Doppler vibration meter.
[0004] Patent Document 1 also discloses the measurement of vibration of magnetic materials using a laser Doppler vibrometer. In Patent Document 1, for example, the displacement of the magnetic material is measured by irradiating a reflector on the magnetic material with a laser beam from the laser Doppler vibrometer. The reflector is positioned on the magnetic material adjacent to the winding portion.
[0005] Existing technical documents
[0006] Patent documents
[0007] Patent Document 1: Japanese Patent Application Publication No. 7-270509
[0008] Non-patent literature
[0009] Non-Patent Document 1: Seiji Okabe and two others, “Transformer Characteristic Analysis Technology of JFE Steel”, JFE Technical Bulletin, JFE Steel Corporation, August 2015, No. 36, pp. 17-23 Summary of the Invention
[0010] The problem the invention aims to solve
[0011] In both Non-Patent Document 1 and Patent Document 1, the vibration of the magnetic core is measured on the outside of the winding section. In both documents, vibration is not measured at the column section of the magnetic core, i.e., the portion where the winding section is mounted. However, it is speculated that particularly large vibrations may occur in the column section, for example, due to the magnetization of the winding section and the interaction between the current flowing in the winding section and the magnetic field generated in the column section. Therefore, it is believed that if the vibration of the column section could be measured, it would be easier to propose a device that reduces noise.
[0012] The subject of this disclosure is to provide an evaluation device capable of measuring the vibration of a column on which a winding section is installed.
[0013] Solution for solving the problem
[0014] The evaluation apparatus disclosed herein evaluates the vibration of magnetic materials. The evaluation apparatus includes a magnetic core, multiple winding sections, and a first measuring device. The magnetic core is made of a magnetic material. The magnetic core includes a post section. The winding sections are arranged with gaps along the axial direction of the post section and are mounted to the post section in a manner that exposes the post section from the gaps. The winding sections are configured to excite the magnetic core by energizing it. The first measuring device measures the vibration of the post section.
[0015] The effects of the invention
[0016] According to the evaluation device disclosed herein, it is possible to measure the vibration of the column portion on which the winding portion is installed. Attached Figure Description
[0017] Figure 1 This is a top view showing the main structure of the evaluation device for the implementation method.
[0018] Figure 2 yes Figure 1 Side view of the evaluation device shown.
[0019] Figure 3 It means Figure 1 and Figure 2 An exploded perspective view of the structure of the evaluation device, including the magnetic core, winding section, and support frame.
[0020] Figure 4 This is a flowchart illustrating the evaluation method for implementing the method.
[0021] Figure 5 This is a top view showing the main structure of the evaluation device for the modified example.
[0022] Figure 6 This is a top view showing the main structure of the evaluation device for the modified example.
[0023] Figure 7 This is a perspective view showing the structure of the winding section included in the evaluation device of the modified example. Detailed Implementation
[0024] An evaluation apparatus according to an embodiment evaluates the vibration of a magnetic material. The evaluation apparatus includes a magnetic core, multiple winding sections, and a first measuring device. The magnetic core is made of a magnetic material. The magnetic core includes a post section. The winding sections are arranged with gaps along the axial direction of the post section and are mounted to the post section in a manner that exposes the post section from the gaps. The winding sections are configured to excite the magnetic core by energizing it. The first measuring device measures the vibration of the post section (first technical solution).
[0025] In the evaluation apparatus of the first technical solution, multiple winding sections are mounted relative to the column section of the magnetic core with gaps between them. The column section is exposed through the gaps between the winding sections. Therefore, for example, when measuring vibrations in the out-of-plane and in-plane directions (directions perpendicular to the axis of the column section) of the column section, the gaps between the winding sections can be utilized. Thus, the vibration of the column section on which the winding sections are mounted can be measured.
[0026] Another evaluation device according to the embodiment evaluates the vibration of magnetic materials. The evaluation device includes multiple winding sections and a first measuring device. The winding sections are arranged with open gaps in their axial direction and can be mounted on the column section of a magnetic core made of magnetic material. The first measuring device measures the vibration of the column section (second technical solution).
[0027] In the evaluation device of the first or second technical solution, multiple winding sections can each include an excitation coil through which an excitation current flows (third technical solution).
[0028] In the primary (input) side excitation coil, a larger current flows compared to the secondary (output) side detection coil, generating a larger Lorentz force. Consequently, the portion of the magnetic core where the excitation coil is located may experience significant vibration. In this regard, the third technical solution includes excitation coils in each winding section, thus the excitation coils are positioned with an open gap in the core's column section. This gap allows vibration to be measured at the location within the column section where the excitation coil is located, i.e., at the position where the large current flows through the excitation coil assembly.
[0029] The evaluation device of any of the first to third technical solutions may also include a jig. The jig can be disposed on the post in the gap between the winding sections to fix the post to the evaluation device (fourth technical solution).
[0030] For example, in a transformer, the magnetic core is used while fixed to a portion of the transformer. When the magnetic core is formed by stacking electromagnetic steel sheets, the stacked sheets are compressed and secured to the transformer. When measuring and evaluating the vibration of the magnetic core, it is preferable to reproduce the actual operating conditions as much as possible. In the fourth technical solution, a fixture is arranged in the gap between the winding sections, and the column portion of the magnetic core is fixed to the evaluation device by this fixture. Since the fixture is positioned on the column portion, a compressive force can be applied to the column portion from its surface. Therefore, the vibration of the column portion can be measured by reproducing the force applied to the column portion during actual use.
[0031] In the evaluation apparatus of the fourth technical solution, the fixture can have a notch. The notch is formed, for example, on the surface of the fixture opposite to the column portion, and extends through the fixture in the axial direction of the column portion (fifth technical solution).
[0032] In the fifth technical solution, a notch is provided in the fixture for fixing the column. This notch can also be used to measure the vibration of the column.
[0033] In the evaluation device of any of the first to fifth technical solutions, the first measuring device may also be a laser Doppler vibrometer (sixth technical solution).
[0034] The evaluation device of any of the first to sixth technical solutions can also include multiple first measuring devices. In this case, each of the first measuring devices can also be configured to adjust its position relative to the column (seventh technical solution).
[0035] The evaluation device for any of the first to seventh technical solutions can also be configured to adjust the excitation waveform based on pre-prepared output waveform information and energize the winding section according to the excitation waveform (eighth technical solution).
[0036] The evaluation device for any of the first to eighth technical solutions may also include a second measuring device. The second measuring device is capable of measuring information from the magnetic core that differs from the information measured by the first measuring device (ninth technical solution).
[0037] The evaluation device for any of the first to ninth technical solutions can also be configured to excite the magnetic core while changing the excitation conditions, and measure the vibration of the column by the first measuring device under each excitation condition (tenth technical solution).
[0038] The evaluation device for any of the first to tenth technical solutions can also include two first measuring devices. In this case, the first measuring devices can irradiate the measuring point of the column with laser light from different directions. A light-shielding plate is provided adjacent to the measuring point between the irradiation path of the laser light from one of the first measuring devices to the measuring point and the irradiation path of the laser light from the other of the first measuring devices to the measuring point. The light-shielding plate prevents interference between the laser light irradiated from one of the first measuring devices and the laser light irradiated from the other of the first measuring devices (eleventh technical solution).
[0039] The evaluation device of the eleventh technical solution includes two first measuring devices. To prevent interference between the laser beams irradiated from these first measuring devices onto the measuring points of the column, a light-shielding plate is provided between the irradiation paths of the laser beams of one and the other. This improves the measurement accuracy of the column vibration by each of the first measuring devices.
[0040] The evaluation method of the embodiment evaluates the vibration of magnetic materials. The evaluation method includes the following steps: preparing a magnetic core including a post and multiple winding sections; energizing the magnetic core by energizing the winding sections; and measuring the vibration of the post using a measuring device. The magnetic core is made of magnetic material. The winding sections are arranged with gaps along the axial direction of the post, and are installed on the post in such a way that the post is exposed from the gaps (twelfth technical solution).
[0041] In the evaluation method of the twelfth technical solution, during the above-mentioned measurement process, the vibration of the column can also be measured from the gap between the windings using a measuring device (the thirteenth technical solution).
[0042] In the evaluation method of the twelfth or thirteenth technical solution, the magnetic core can include three posts. In this case, multiple winding sections are respectively installed on the three posts. The wiring method of the winding sections between the posts can be changed (fourteenth technical solution).
[0043] The following is a reference to the appendix. Figure 1 The embodiments of this disclosure will be described below. In each figure, the same or equivalent structures are labeled with the same reference numerals, and the same descriptions are not repeated.
[0044] [Evaluation Device]
[0045] Figure 1 This is a top view showing the main structure of the evaluation device 100 in this embodiment. Figure 2 yes Figure 1 The evaluation device 100 is shown as a side view. The evaluation device 100 is used to evaluate the vibration of magnetic materials. (Refer to...) Figure 1 and Figure 2The evaluation device 100 includes a magnetic core 10 as the evaluation object, multiple winding sections 20, and multiple first measuring devices 31, 32, and 33. The evaluation device 100 may also include a support frame 40, a fixture 50 or 60, a control device 70, and a second measuring device 80.
[0046] The magnetic core 10 and the winding section 20 are supported, for example, by a support frame 40. Figure 3 This is an exploded perspective view showing the structure of the magnetic core 10, the winding section 20, and the support frame 40.
[0047] Reference Figure 3 The magnetic core 10 includes at least one post 11. In this embodiment, the magnetic core 10 includes three posts 11. These posts 11 are arranged side by side and connected by a yoke 12.
[0048] The magnetic core 10 is made of magnetic material. For example, the magnetic core 10 is a laminated iron core formed by stacking multiple steel plates. More specifically, in each layer, the steel plate for the column 11 and the steel plate for the yoke 12 are separate structures, and the steel plates are stacked in a manner that varies for each layer or each layer, with the seams between them varying. For the magnetic core 10, directional electromagnetic steel plates are typically used. However, non-directional electromagnetic steel plates or amorphous alloy plates can also be used for the magnetic core 10. Furthermore, the magnetic core 10 is not limited to a laminated iron core; for example, it can also be a wound iron core. Alternatively, the magnetic core 10 can also be a powder-pressed iron core.
[0049] At least one column 11 is equipped with a plurality of winding sections 20. Figure 3 In the example shown, multiple winding portions 20 are mounted on each of the post portions 11. In this embodiment, each winding portion 20 includes a winding bobbin 21 and a coil 22. The winding bobbin 21 is made of a non-conductive material. The winding bobbin 21 has a cylindrical shape. The post portion 11 is inserted into the winding bobbin 21. Figure 3 In the example shown, multiple independent winding sections 20 are formed by independently winding coils 22 on multiple winding bobbins 21 arranged with open intervals. These multiple winding sections 20 (winding bobbins 21) are the parts without winding sections, which are set as gaps G.
[0050] The coil 22 is made of a conductive material. The coil 22 is configured to be wound around the post portion 11. In this embodiment, the coil 22 is wound around the winding drum 21. The coil 22 includes at least one of a primary-side excitation coil and a secondary-side detection coil. The coil 22 may also include both an excitation coil and a detection coil. For example, the coil 22 may include an excitation coil and a detection coil wound concentrically relative to the winding drum 21. In this case, the detection coil may be arranged on the excitation coil, or the excitation coil may be arranged on the detection coil. In the coil 22, the excitation coil and the detection coil are electrically insulated. Although not shown in the figure, the coil 22 may also be covered with a known insulating paper.
[0051] At least one column 11 is provided with a plurality of winding sections 20. In this embodiment, each column 11 is provided with a plurality of winding sections 20. For example, three or more winding sections 20 are provided for each column 11. In the column 11, where each of the plurality of winding sections 20 includes an excitation coil in the coil 22, these excitation coils are electrically connected in series. Similarly, in the column 11, where each of the plurality of winding sections 20 includes a detection coil in the coil 22 in addition to the excitation coil, these detection coils are electrically connected in series. As in this embodiment, the magnetic core 10 and the winding sections 20 can also constitute a model of a three-phase, three-column transformer.
[0052] In at least one column 11, the winding portion 20 is open-circuited G along the axial direction of the column 11 (the length direction of the column). Figure 3 The winding portions 20 are arranged in the Y direction. At least one gap G exists between the winding portions 20 arranged axially along the column portion 11. The winding portions 20 are mounted to the column portion 11 in such a way that the column portion 11 is exposed through the gap G between the winding portions 20. In this embodiment, since three or more winding portions 20 are provided for each column portion 11, multiple gaps G exist in the rows of winding portions 20 of the column portion 11. The number of gaps G for each column portion 11 can be, for example, two or more, or five or more. The size of each gap G in the axial direction of the column portion 11 is preferably 1 mm or more. The size of each gap G in the axial direction of the column portion 11 can be, for example, 50 mm or less. Furthermore, the size of each gap G can also be 30 mm or less, and even 10 mm or less. Hereinafter, for ease of explanation, the axial direction of the column portion 11 will sometimes be referred to as the Y direction. Additionally, sometimes... Figure 3 The vertical direction of the paper is called the Z direction, and the width direction of the column 11 (the direction perpendicular to the Y direction and the Z direction) is called the X direction.
[0053] The magnetic core 10 and the winding portion 20 are mounted on the support frame 40. The magnetic core 10 is preferably fixed to the support frame 40 by fixtures 50 and 60.
[0054] When the magnetic core 10 is fixed to the evaluation device 100 by the fixture 50, the fixture 50 is provided with at least one post portion 11 having a gap G between the winding portions 20. The fixture 50 is disposed on the post portion 11 in the gap G between the winding portions 20. The fixture 50 has a shape corresponding to the gap G between the winding portions 20. The fixture 50 is disposed in the gap G between the winding portions 20 in a manner that traverses the post portion 11 in the X direction.
[0055] The fixture 50 is fixed relative to the support frame 40, for example. More specifically, the fixture 50 is mounted on the column 11 and fastened to the support frame 40 on both sides in the X direction by fastening members 51 such as bolts. Thus, the column 11 is fixed to the evaluation device 100 by the fixture 50. That is, the column 11 is compressed between the support frame 40 and the fixture 50, and the column 11 is fastened relative to the support frame 40.
[0056] The jig 50 may have at least one notch 52. Figure 3 In the example shown, the fixture 50 includes a plurality of notches 52. These notches 52 are formed on the surface of the fixture 50 opposite to the post portion 11. Each notch 52 extends through the fixture 50 in the Y direction. Each notch 52 has a groove shape extending from one winding portion 20 toward the other winding portion 20 when the fixture 50 is positioned in the gap G between two adjacent winding portions 20.
[0057] When the magnetic core 10 is fixed to the evaluation device 100 by the fixture 60, the fixture 60 is respectively provided corresponding to the magnetic yoke 12 of the magnetic core 10. The fixture 60, for example, fixes the magnetic yoke 12 relative to the support frame 40. Figure 3 In this example, jig 60 includes a jig body 61 and one or more pressure plates 62. The jig body 61 is disposed on the magnetic yoke 12. Figure 3 As shown, the fixture body 61 can also be divided into multiple parts. A pressure plate 62 is disposed on the fixture body 61. The pressure plate 62 is fastened to the support frame 40 at multiple locations by fastening members 63 such as bolts. Thus, the magnetic yoke 12 is fixed to the evaluation device 100 via the fixture 60. That is, the magnetic yoke 12 is compressed between the support frame 40 and the fixture 60, and the magnetic yoke 12 is fastened relative to the support frame 40.
[0058] The jig 60 may have at least one notch 64. Figure 3 In the example shown, the jig 60 includes a plurality of notches 64. The notches 64 are formed, for example, in the jig body 61 on the surface opposite to the yoke 12. Each notch 64 penetrates the jig body 61 in the Y direction. That is, each notch 64 has a groove-like shape extending from the yoke 12 side toward the post 11 side. Each notch 64 is, for example, positioned corresponding to any of the notches 52 provided on the jig 50 on the post 11 side.
[0059] exist Figure 1 and Figure 2 In this design, the first measuring devices 31, 32, and 33 are measuring devices used to measure the vibration of the column portion 11 of the magnetic core 10. The first measuring devices 31, 32, and 33 can measure the vibration (displacement) of the column portion 11 when the magnetic core 10 is energized. Typically, the first measuring devices 31, 32, and 33 are laser Doppler vibrometers. However, the first measuring devices 31, 32, and 33 can also be other vibrometers. For example, the first measuring devices 31, 32, and 33 can be non-contact vibrometers such as white light interferometric displacement meters, electrostatic capacitance displacement meters, or laser displacement meters, or they can be contact vibrometers. The first measuring devices 31, 32, and 33 can be appropriately selected from known vibrometers. Furthermore, in Figure 2 The first measuring device 32 is omitted in the text.
[0060] In this embodiment, the first measuring device 31 is disposed above the magnetic core 10, which is the object of evaluation. The first measuring device 31 is configured to be able to adjust the position of the post portion 11 relative to the magnetic core 10. More specifically, the relative positional relationship between the first measuring device 31 and the post portion 11 can be adjusted in the X and Y directions.
[0061] Reference Figure 2 The first measuring device 31 is mounted on the traveling platform 312 by means of a mounting member 311. The first measuring device 31 can also be attached to and detached relative to the mounting member 311. The traveling platform 312 is movable in the Y direction. The traveling platform 312 travels, for example, near the support frame 40 along a track 313 extending in the Y direction. Accompanying the movement of the traveling platform 312 in the Y direction, the first measuring device 31 moves relative to the column 11 ( Figure 1 and Figure 3 The position of ) in the Y direction changes.
[0062] Reference Figure 1 The traveling platform 312 is arranged across the support frame 40 supporting the magnetic core 10 in the X direction. A track 312a is provided on the traveling platform 312. The track 312a is positioned above the magnetic core 10 and extends in the X direction. The mounting member 311 moves along the track 312a in the X direction. As the mounting member 311 moves in the X direction, the position of the first measuring device 31 relative to the column 11 in the X direction changes.
[0063] Continue to refer to Figure 1The first measuring device 32 is configured to be adjustable in position relative to the column 11 of the magnetic core 10. More specifically, in the Y direction, the relative positional relationship between the first measuring device 32 and the column 11 can be adjusted. The first measuring device 32 is mounted on the traveling platform 321. The first measuring device 32 can also be attached to and detached relative to the traveling platform 321. The traveling platform 321 is movable in the Y direction. The traveling platform 321 travels, for example, near the support frame 40 along a track 322 extending in the Y direction. As the traveling platform 321 moves in the Y direction, the position of the first measuring device 32 relative to the column 11 in the Y direction changes.
[0064] The first measuring device 33 is configured to adjust the position of the post 11 relative to the magnetic core 10. More specifically, in the X direction, the relative positional relationship between the first measuring device 33 and the post 11 can be adjusted. Figure 1 and Figure 2 As shown, the first measuring device 33 is mounted on the traveling platform 331. The first measuring device 33 can also be attached to and detached relative to the traveling platform 331. The traveling platform 331 is movable in the X direction. The traveling platform 331 travels, for example, near the support frame 40 along a track 332 extending in the X direction. As the traveling platform 331 moves in the X direction, the position of the first measuring device 33 relative to the column 11 in the X direction changes.
[0065] Reference Figure 1 and Figure 2 The control device 70 is, for example, a computer including a central processing unit (CPU), main memory, auxiliary memory, input devices, and output devices. The control device 70 is directly or indirectly connected to the first measuring devices 31, 32, and 33 in a communicative manner. The control device 70 may also be connected to the first measuring devices 31, 32, and 33 via, for example, an A / D converter (not shown).
[0066] The control device 70 is also communicatively connected to the excitation power supply (not shown). The excitation power supply supplies excitation current to the excitation coils included in the winding section 20 of each column 11 of the magnetic core 10. For example, an AC voltage is applied to the excitation coils by the excitation power supply, thereby causing an excitation current to flow through the excitation coils. The excitation power supply may include, for example, an arbitrary waveform generator and a power amplifier.
[0067] In each column portion 11 of the magnetic core 10, a voltmeter (not shown) may be connected to a detection coil included in the winding portion 20. In this case, the control device 70 may also be connected to the voltmeter directly or indirectly in a communicative manner.
[0068] The control device 70 may also be directly or indirectly connected to the second measuring device 80 in a communicative manner. The second measuring device 80 is configured to measure information from the magnetic core 10. The second measuring device 80 acquires information different from that of the first measuring devices 31, 32, and 33. Examples of the second measuring device 80 include a temperature sensor, an accelerometer, or a strain gauge. The second measuring device 80 simply needs to be positioned appropriately relative to the magnetic core 10 based on the measured information. The evaluation device 100 may include one or more second measuring devices 80.
[0069] [Evaluation Method]
[0070] Next, further reference Figure 4 The evaluation method using evaluation device 100 is explained. Figure 4 This is a flowchart illustrating the evaluation method of this embodiment. In the evaluation method of this embodiment, the vibration of the magnetic material constituting the magnetic core 10 is evaluated. Figure 4 The flowchart includes not only the procedures performed by the evaluation device 100, but also the procedures performed by the personnel evaluating the vibration of the magnetic material. For example... Figure 4 As shown, the evaluation method includes a preparation step S1 and a measurement step S2.
[0071] (Preparation process)
[0072] In the preparation step S1, the magnetic core 10 and multiple winding sections 20 are prepared. Figure 3 The magnetic core 10 and winding sections 20 are prepared by the evaluator. As described above, in the magnetic core 10, which is the object of evaluation, two or more winding sections 20 are installed in at least one column 11. In the example of this embodiment, the magnetic core 10 and winding sections 20 constitute a model of a three-phase AC transformer.
[0073] (Measurement process)
[0074] In measurement step S2, the magnetic core 10 is energized by energizing the winding section 20, and the vibration of the column section 11 is measured by one or more of the first measuring devices 31, 32, and 33. In this embodiment, for ease of understanding, the vibration measurement step is described focusing on one of the multiple columns 11 included in the magnetic core 10.
[0075] At the start of measurement step S2, the evaluator adjusts the position of one or more of the first measuring devices 31, 32, and 33 relative to the column 11 being measured (step S21). The first measuring devices 31, 32, and 33 can be moved manually by the evaluator or automatically by the control device 70 controlling the moving mechanism. For example, the first measuring devices 31, 32, and 33 are moved to a position corresponding to the gap G of the winding section 20.
[0076] Next, the evaluation device 100 begins to energize the winding section 20 mounted on the column section 11, thus energizing the magnetic core 10 (step S22). Specifically, the control device 70 outputs a command signal to the excitation power supply (not shown) according to the operation of the evaluation personnel, and the excitation power supply supplies excitation current to the excitation coil of the winding section 20. The excitation power supply generates an excitation waveform based on the command signal from the control device 70, and causes the excitation coil to generate an excitation current according to this excitation waveform. For example, an AC voltage of the excitation waveform generated by the excitation power supply can also be applied to the excitation coil, thereby causing an excitation current to flow through the excitation coil. The excitation waveform applied to the excitation coil may not be a sine wave.
[0077] For example, the control device 70 reads pre-prepared output waveform information and adjusts the excitation waveform based on this output waveform information. The output waveform information may be, for example, the magnetic flux waveform information of the magnetic core 10, or the waveform information of the current or voltage in the detection coil (detection waveform information). The output waveform information can be pre-stored in an auxiliary storage device of the control device 70, etc. The control device 70 outputs the adjusted excitation waveform information to the excitation power supply. The excitation power supply energizes the winding section 20 according to the excitation waveform indicated by the control device 70. By energizing the winding section 20, a magnetic flux is generated in the column section 11 of the magnetic core 10 with a waveform corresponding to the pre-stored magnetic flux waveform information, or a current is generated in the detection coil of the winding section 20 with a waveform corresponding to the pre-stored detection waveform information. The excitation waveform can also be derived from the output waveform information, such as the magnetic flux waveform information or the detection waveform information, using known calculation methods.
[0078] The vibration of the column 11 is measured while the magnetic core 10 is energized to generate an alternating magnetic field (step S23). The vibration measurement is performed using one or more of the first measuring devices 31, 32, and 33.
[0079] The first measuring device 31 can measure the out-of-plane (Z-direction) vibration of the column portion 11 through the gap G between the winding portions 20. No fixture 50 is provided in the gap G used for measurement by the first measuring device 31. For example, if the first measuring device 31 is a laser Doppler vibrometer, the first measuring device 31 can irradiate a laser beam onto the surface of the column portion 11 through the gap G between the winding portions 20 and measure the Z-direction displacement of the column portion 11 by detecting the reflected light.
[0080] The first measuring device 32 can measure the in-plane (X-direction) vibration of the column portion 11 through the gap G between the winding portions 20. No fixture 50 is provided in the gap G used for measurement by the first measuring device 32. For example, if the first measuring device 32 is a laser Doppler vibrometer, the first measuring device 32 irradiates a laser beam toward the column portion 11 from the gap G between the winding portions 20. In this case, it is preferable to attach a reflector (not shown) made of, for example, plastic to the column portion 11. The first measuring device 32 can measure the X-direction displacement of the column portion 11 by detecting the laser beam reflected by the reflector.
[0081] The first measuring device 33 is capable of measuring the in-plane vibration (Y direction) of the column 11. For example, if the first measuring device 33 is a laser Doppler vibrometer, the first measuring device 33 irradiates a laser towards the column 11. In this case, it is preferable to attach a reflector (not shown) made of, for example, plastic to the column 11. The laser can pass through the notches 52 and 64 of the fixtures 50 and 60 to reach the reflector. The first measuring device 33 can detect the laser reflected by the reflector to measure the displacement of the column 11 in the Y direction.
[0082] Vibration information of the column 11 is input to the control device 70 from one or more of the first measuring devices 31, 32, and 33. The vibration information is converted into a digital signal by an A / D converter and sent to the control device 70. The control device 70 stores the input vibration information.
[0083] When the magnetic core 10 is energized to generate an alternating magnetic field, the control device 70 can also acquire measurement information from the second measuring device 80 in addition to vibration information.
[0084] In the presence of multiple pre-prepared excitation conditions, the evaluation device 100 can also change the excitation conditions while maintaining the positions of the first measuring devices 31, 32, and 33, and then perform the aforementioned measurements again (steps S24, S22, and S23). Multiple excitation conditions may be pre-stored in, for example, an auxiliary storage device of the control device 70. By executing a predetermined program through the CPU of the control device 70, the excitation conditions can be automatically changed to perform vibration measurements. The excitation conditions include frequency and magnetic flux density. The control device 70 energizes the winding section 20 and the magnetic core 10 according to a pre-set combination of excitation conditions, such as frequency and magnetic flux density. One or more of the first measuring devices 31, 32, and 33 measure the vibration of the column section 11 for each excitation condition and send the measured information to the control device 70. For example, the evaluation device 100 can repeatedly measure the vibration of the column section 11 while changing the excitation conditions until all prepared excitation conditions are exhausted.
[0085] In this embodiment, the magnetic core 10, which is the object of evaluation, includes three columns 11, each with a plurality of winding sections 20 mounted thereon. The evaluator can also change the wiring configuration of the winding sections 20 to perform the measurement process S2. As in this embodiment, when each column 11 has an excitation coil and a detection coil mounted on its winding section 20, the evaluator can switch the wiring configuration of the excitation coil and the detection coil separately. In the case of a three-phase AC transformer model, the switching wiring configuration is typically a delta connection or a star connection. Regardless of the wiring configuration, the evaluation device 100 can measure the vibration of the columns 11.
[0086] [Effect]
[0087] Typically, winding portions are mounted without gaps on the posts (main posts) of a magnetic core. That is, the winding portions are usually arranged closely relative to the posts in a manner that prevents the posts from being exposed. In contrast, in this embodiment, a plurality of winding portions 20 are mounted relative to at least one post 11 of the magnetic core 10 with a gap G between them. The post 11 is exposed from the gap G between the winding portions 20. By utilizing this gap G, the vibration of the post 11 can be measured even within the area where the winding portions 20 are provided.
[0088] In this embodiment, the out-of-plane (Z-direction) vibration of the column portion 11 can be measured from the gap G between the winding portions 20 using the first measuring device 31. Furthermore, the in-plane (X-direction) vibration of the column portion 11 can be measured from the gap G between the winding portions 20 using the first measuring device 32. In addition, the in-plane (Y-direction) vibration of the column portion 11 can also be measured using the first measuring device 33.
[0089] In this embodiment, vibration (displacement) in the XYZ directions of the column 11 can be detected. Based on the displacement in the XYZ directions of the column 11, and taking into account the dimensions of the column 11, the magnetostriction (displacement per unit length) in the XYZ directions of the column 11 can be calculated. Therefore, the magnetostriction of the column 11 can also be obtained.
[0090] In this embodiment, the first measuring devices 31, 32, and 33 are each configured to be adjustable in position relative to the column 11, which is the object of measurement. Therefore, the first measuring devices 31, 32, and 33 can measure and acquire the vibration of the column 11 at various positions.
[0091] In this embodiment, in at least one column portion 11 of the magnetic core 10, multiple winding portions 20 each include an excitation coil. The excitation coils, electrically connected in series within the column portion 11, are arranged with a gap G between them. In this case, vibration can be measured at the position of the excitation coil group flowing with a large excitation current in the column portion 11 using the gap G between the excitation coils.
[0092] However, in the column portion 11, each winding portion 20 may not include an excitation coil. Each winding portion 20 may also include only one of an excitation coil and a detection coil. For example, it is also possible that one or more winding portions 20 arranged on one side of the column portion 11 in the axial direction may only include an excitation coil, and one or more winding portions 20 arranged on the other side of the column portion 11 in the axial direction may only include a detection coil.
[0093] In this embodiment, a jig 50 may be provided in at least one of the gaps G that expose the column 11. The jig 50 is disposed on the column 11 in the gap G and fixes the column 11 to the evaluation device 100. The jig 50 is capable of applying a compressive force to the column 11 from its surface. As a result, the vibration of the column 11 can be measured in a way that reproduces the force applied to the column 11 during actual use.
[0094] In this embodiment, the fixture 50 may also have at least one notch 52. The notch 52 extends through the fixture 50 in the Y direction, thus allowing, for example, laser light irradiated from the first measuring device 33 and its reflected light to pass through. Therefore, even when the fixture 50 is positioned in the gap G between the winding portions 20, the vibration of the column portion 11 in the Y direction at the position crossing the fixture 50 can be measured by the first measuring device 33.
[0095] In this embodiment, the magnetic core 10 can also be fixed to the evaluation device 100 by the fixture 60. This allows for the secure measurement of the vibration of the column portion 11. The fixture 60 may also have at least one notch 64. The notch 64 extends through the fixture 60 in the Y direction, thus, like the notch 52 of the fixture 50, allowing the laser light irradiated from the first measuring device 33 and its reflected light to pass through. Therefore, the vibration of the column portion 11 in the Y direction can be measured by the first measuring device 33 without obstruction from the fixture 60.
[0096] The evaluation device 100 in this embodiment can also be configured to adjust the excitation waveform based on pre-prepared output waveform information, and energize the winding section 20 according to the adjusted excitation waveform. The evaluation device 100 can excite the winding section 20 not only with a sine wave, but also with a variety of desired excitation waveforms. For example, the excitation waveform applied to the excitation coil of the winding section 20 can be adjusted so that the magnetic flux waveform of the magnetic core 10, or the current or voltage waveform of the detection coil, becomes a sine wave.
[0097] In this embodiment, the second measuring device 80 can also measure information on the magnetic core 10 that differs from the information measured by the first measuring devices 31, 32, and 33. This information is stored, for example, in the control device 70. An evaluator can, for example, also consider the measurement information obtained by the second measuring device 80 to evaluate the vibration and magnetostriction of the column portion 11 of the magnetic core 10.
[0098] The evaluation device 100 of this embodiment can also be configured to excite the magnetic core 10 while changing the excitation conditions, and measure the vibration of the column 11 using one or more of the first measuring devices 31, 32, and 33 under each excitation condition. This information is stored, for example, in the control device 70. For example, the evaluation device 100 can measure the vibration of the column 11 while changing the excitation conditions while maintaining the positions of the first measuring devices 31, 32, and 33, thereby obtaining measurement information from the same measurement position under different excitation conditions. The evaluator can then synthesize the vibration information obtained under different excitation conditions to evaluate the vibration and magnetostriction of the column 11 of the magnetic core 10.
[0099] The embodiments of this disclosure have been described above, but this disclosure is not limited to the above embodiments and various changes can be made without departing from its spirit.
[0100] In the above embodiment, the evaluation device 100 includes multiple first measuring devices 31, 32, and 33 for measuring the vibration of the column 11 in three directions (X, Y, and Z directions). However, the evaluation device 100 only needs to include at least one of the first measuring devices 31, 32, and 33. For example, if the evaluation device 100 includes only one first measuring device 31, the first measuring device 31 can be used only for measuring the vibration of the column 11 in the out-of-plane direction (Z direction), or it can be used for measuring the vibration in the in-plane directions (X and Y directions) in addition to the out-of-plane direction. That is, the first measuring device 31 can be used, for example, by replacing the travel stage 312 with the travel stage 321 or 331. The same applies to the first measuring devices 32 and 33. The first measuring devices 32 and 33 can be used for measuring vibration in the X, Y, and Z directions.
[0101] When the evaluation device 100 includes two or more first measuring devices capable of measuring vibration like the first measuring devices 31, 32, and 33, the vibration of the column 11 can be measured simultaneously in two or more of the XYZ directions. For example, as Figure 5 As shown, the vibration of the column 11 at measurement point P can also be measured simultaneously using each of the first measuring devices 32 and 33. Figure 5 In order to avoid complicating the attached drawings, the winding part 20 and the fixtures 50 and 60 are omitted.
[0102] Reference Figure 5 The first measuring devices 32 and 33 can irradiate the measuring point P of the column 11 with laser light from different directions. Specifically, the first measuring device 32 can irradiate the measuring point P with laser light along the X direction, and the first measuring device 33 can irradiate the measuring point P with laser light along the Y direction. The measuring point P is the gap G between the column 11 and the winding section 20. Figures 1-3 The corresponding position. For example, a reflector is attached to the measuring point P of the column 11.
[0103] A light-shielding plate 23 may also be provided between the laser irradiation path R1 from the first measuring device 32 to the measuring point P and the laser irradiation path R2 from the first measuring device 33 to the measuring point P. The light-shielding plate 23 is arranged adjacent to the measuring point P. For example, the light-shielding plate 23 may be arranged next to the reflector on the column 11. Figure 5 In the example, when viewed along the Z-direction perpendicular to the laser irradiation paths R1 and R2 of the first measuring devices 32 and 33, the light-shielding plate 23 appears to be linear. However, as... Figure 6 As shown, when viewed along directions perpendicular to the illumination paths R1 and R2, the light-shielding plate 23 can also have a roughly L-shaped form. The light-shielding plate 23 is, for example, disposed in the winding bobbin 21 of the winding section 20. Figure 3The inner side of the measurement point P. In the evaluation device 100, a single light-shielding plate 23 or multiple light-shielding plates 23 can be set for the measurement point P.
[0104] The light shield 23 is a plate-shaped component used to prevent interference between the laser beams irradiated from the first measuring device 32 and the laser beams irradiated from the first measuring device 33. By preventing interference between the laser beams irradiated from the first measuring devices 32 and 33 toward the measuring point P, the measurement accuracy of the vibration of the column 11 by the first measuring devices 32 and 33 can be improved.
[0105] exist Figure 5 and Figure 6 In the example, the vibration of the column 11 at measurement point P is simultaneously measured in the X and Y directions using the first measuring devices 32 and 33. However, the vibration of the column 11 at measurement point P can also be simultaneously measured in the Z and Y directions using the first measuring devices 31 and 33, or simultaneously in the Z and X directions using the first measuring devices 31 and 32. Furthermore, the vibration of the column 11 at measurement point P can also be simultaneously measured in the Z, X, and Y directions using the first measuring devices 31, 32, and 33. Alternatively, in these cases, a light-shielding plate 23 can be provided between the laser irradiation paths of the two or more first measuring devices to prevent interference between the lasers irradiated from the two or more first measuring devices toward measurement point P.
[0106] Alternatively, the vibration of the column 11 can be measured at multiple locations in the same direction using multiple first measuring devices. For example, when measuring the vibration in the Y direction at multiple locations of the column 11, multiple first measuring devices are prepared, and reflectors are placed at different positions in the Y direction on the surface of the column 11. Then, a laser, for example, is irradiated onto each reflector from its corresponding first measuring device, thereby enabling the measurement of the vibration (displacement) of the column 11 in the Y direction at each location. For example, by obtaining the difference in vibration at multiple measurement locations, the elongation of the column 11 between measurement locations can be obtained. Similarly, vibration can also be measured at multiple measurement locations of the column 11 in the X and Z directions.
[0107] In the above embodiment, the evaluation device 100 is equipped with a magnetic core 10, which is the object of evaluation, in order to explain its usage along with the structure of the evaluation device 100. However, at times when the evaluation of the vibration of the magnetic material is not performed, such as during the operation of the evaluation device 100, the magnetic core 10 may not be provided in the evaluation device 100. That is, the magnetic core 10, which is the object of evaluation, may not be pre-installed in the winding section 20. The evaluation device 100 may include at least one of a plurality of winding sections 20 and a first measuring device 31, 32, 33. In this case, in the evaluation device 100, the plurality of winding sections 20 are arranged with gaps in the axial direction of the winding sections 20.
[0108] In the above embodiment, the first measuring devices 31, 32, and 33 are moved in order to adjust the positional relationship between the column 11, which is the object of measurement, and the first measuring devices 31, 32, and 33. However, as long as the relative position of the first measuring devices 31, 32, and 33 with respect to the column 11 can be adjusted, for example, the support frame 40 supporting the magnetic core 10 can also be moved.
[0109] In the evaluation device 100 of the above embodiment, the winding portions 20 are arranged with a gap G in their axial direction. Therefore, when installing the winding portions 20 onto the post portions 11 of the magnetic core 10, sometimes the post portions 11 are stuck on the winding portions 20 at the gap G position, and the installation of the winding portions 20 onto the post portions 11 takes time. Therefore, as Figure 7 As shown, the evaluation device 100 may also include a pad 24. The pad 24 is inserted into the winding bobbin 21 of each winding section 20 and extends along the arrangement direction of the winding sections 20. In this case, the post section 11 of the magnetic core 10 ( Figure 1 The winding portion 20 is inserted into the pad 24. This prevents the post portion 11 from getting stuck in the winding portion 20 at the gap G position, and allows the winding portion 20 to be smoothly installed on the post portion 11.
[0110] Explanation of reference numerals in the attached figures
[0111] 100. Evaluation device; 10. Magnetic core; 11. Column; 20. Winding section; 22. Coil (excitation coil); 31, 32, 33. First measuring device; 50. Fixture; 52. Notch section; 80. Second measuring device.
Claims
1. An evaluation device for evaluating the vibration of a magnetic material, wherein, The evaluation device has the following features: A magnetic core, which is made of the magnetic material, includes pillars; A plurality of winding portions are arranged with gaps along the axial direction of the post portion and mounted on the post portion in such a manner that the post portion is exposed from the gaps. These multiple winding portions are configured to excite the magnetic core by energizing it. A first measuring device measures the vibration of the column.
2. An evaluation device for evaluating the vibration of a magnetic material, wherein, The evaluation device has the following features: Multiple winding sections are arranged with open gaps in the axial direction, and these multiple winding sections can be mounted on the column portion of a magnetic core made of the magnetic material; and A first measuring device is used to measure the vibration of the column.
3. The evaluation device according to claim 1 or 2, wherein, The plurality of winding sections each include an excitation coil through which an excitation current flows.
4. The evaluation device according to claim 1 or 2, wherein, The evaluation device also includes a fixture that is disposed on the column in the gap and fixes the column to the evaluation device.
5. The evaluation device according to claim 4, wherein, The fixture has a notch formed on the surface opposite to the column portion, which extends through the fixture in the axial direction.
6. The evaluation apparatus according to claim 1 or 2, wherein, The first measuring device is a laser Doppler vibrometer.
7. The evaluation apparatus according to claim 1 or 2, wherein, The evaluation device has multiple of the first measuring devices. Each of the first measuring devices is configured to be able to adjust its position relative to the column.
8. The evaluation apparatus according to claim 1 or 2, wherein, The evaluation device is configured to adjust the excitation waveform based on pre-prepared output waveform information and energize the winding section according to the excitation waveform.
9. The evaluation apparatus according to claim 1 or 2, wherein, The evaluation device also includes a second measuring device for information that differs from the information measured by the first measuring device.
10. The evaluation apparatus according to claim 1 or 2, wherein, The evaluation device is configured to excite the magnetic core while changing the excitation conditions, and the vibration of the column is measured by the first measuring device under each of the excitation conditions.
11. The evaluation apparatus according to claim 1 or 2, wherein, The evaluation device has two of the first measuring devices. The first measuring device can irradiate the measuring points of the column with laser light from different directions. A light-shielding plate is provided adjacent to the measurement point between the laser irradiation path from one of the first measuring devices to the measurement point and the laser irradiation path from the other of the first measuring devices to the measurement point. The light-shielding plate is used to prevent interference between the laser irradiated from one of the first measuring devices and the laser irradiated from the other of the first measuring devices.
12. An evaluation method for evaluating the vibration of magnetic materials, wherein, This evaluation method includes the following steps: Prepare a magnetic core made of the magnetic material and including a column portion, and a plurality of winding portions arranged axially with gaps in the column portion and mounted on the column portion in such a manner that the column portion is exposed from the gaps; and The magnetic core is energized by energizing the winding section, and the vibration of the column is measured by a measuring device.
13. The evaluation method according to claim 12, wherein, In the measurement process, the vibration of the column is measured through the gap using the measuring device.
14. The evaluation method according to claim 12, wherein, The magnetic core includes three column sections on which the plurality of winding sections are respectively mounted. The wiring method of the winding section between the columns is changed.