WO2020079836A1 - Transformateur rotatif pour détecteur de défauts ultrasonore et détecteur de défauts ultrasonore - Google Patents

Transformateur rotatif pour détecteur de défauts ultrasonore et détecteur de défauts ultrasonore Download PDF

Info

Publication number
WO2020079836A1
WO2020079836A1 PCT/JP2018/039039 JP2018039039W WO2020079836A1 WO 2020079836 A1 WO2020079836 A1 WO 2020079836A1 JP 2018039039 W JP2018039039 W JP 2018039039W WO 2020079836 A1 WO2020079836 A1 WO 2020079836A1
Authority
WO
WIPO (PCT)
Prior art keywords
holding member
conductor
substrate
floating conductor
rotary transformer
Prior art date
Application number
PCT/JP2018/039039
Other languages
English (en)
Japanese (ja)
Inventor
拓真 西村
秀憲 湯川
智英 西川
俊明 鴨居
Original Assignee
三菱電機株式会社
菱電湘南エレクトロニクス株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 三菱電機株式会社, 菱電湘南エレクトロニクス株式会社 filed Critical 三菱電機株式会社
Priority to PCT/JP2018/039039 priority Critical patent/WO2020079836A1/fr
Priority to JP2019529659A priority patent/JP6669313B1/ja
Publication of WO2020079836A1 publication Critical patent/WO2020079836A1/fr

Links

Images

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
    • G01N29/22—Details, e.g. general constructional or apparatus details
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
    • G01N29/22—Details, e.g. general constructional or apparatus details
    • G01N29/24—Probes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F38/00—Adaptations of transformers or inductances for specific applications or functions
    • H01F38/18—Rotary transformers

Definitions

  • the present invention relates to a rotary transformer for an ultrasonic flaw detector, which includes a fixed body and a rotating body.
  • the present invention also relates to an ultrasonic flaw detector equipped with a rotary transformer.
  • Patent Document 1 discloses a rotary transformer for an ultrasonic flaw detector, which includes a fixed body and a rotating body.
  • the fixed body includes a substrate on which a plurality of one-turn coils (hereinafter, referred to as “first one-turn coil”) are concentrically formed (hereinafter, referred to as “first substrate”) and a first substrate.
  • a holding member (hereinafter, referred to as “first holding member”) that holds the holding member.
  • the rotating body is a substrate (hereinafter, referred to as “second unit”) in which the same number of one-turn coils (hereinafter, referred to as “second one-turn coil”) formed in the fixed unit are concentrically formed.
  • second holding member that holds the second substrate (hereinafter, referred to as “second holding member”). Air is present between the first substrate and the first holding member included in the fixed body. Further, air is present between the second substrate and the second holding member included in the rotating body.
  • the first and second holding members are formed of a conductor. Therefore, when an electric signal flows through the first and second one-turn coils, an electromagnetic induction phenomenon may cause eddy current loss or hysteresis loss in the first and second holding members. Since the eddy current loss, the hysteresis loss, and the like are generated in the first and second holding members, the transmission characteristics of the electric signal are deteriorated, and thus the flaw detection accuracy of the inspected material is deteriorated. The air between the first and second substrates and the first and second holding members acts to reduce the influence of the electromagnetic induction phenomenon.
  • the present invention has been made to solve the above-described problems, and in order to eliminate the influence of the electromagnetic induction phenomenon, the first and second substrates and the first and second holding members are provided between the first and second substrates.
  • An object of the present invention is to obtain a rotary transformer for an ultrasonic flaw detector and an ultrasonic flaw detector that can eliminate the influence of an electromagnetic induction phenomenon without increasing the distance.
  • a plurality of first one-turn coils are concentrically formed on a first plane, and a first floating conductor is formed on a second plane.
  • a fixed body having a first substrate and a first holding member that holds the first substrate so as to surround the first floating conductor, and to face each of the plurality of first one-turn coils.
  • the second holding member and the plurality of ultrasonic probes include a rotating body that rotates around the material to be inspected. Those were Unishi.
  • the fixed body has the first holding member that holds the first substrate so as to surround the first floating conductor, and the rotating body surrounds the second floating conductor. It has the 2nd holding member holding the 2nd substrate. Therefore, in the rotary transformer for the ultrasonic flaw detector according to the present invention, in order to eliminate the influence of the electromagnetic induction phenomenon, the distance between the first and second substrates and the first and second holding members is reduced. The effect of the electromagnetic induction phenomenon can be eliminated without increasing the length.
  • FIG. 3 is a cross-sectional view showing a C-C ′ cross section of the outer ring 10 shown in FIG. 2. It is a plan view of the inner ring 20 from the x 2 direction in FIG. 1 in the rotating transformer 1 for ultrasonic flaw detection apparatus.
  • FIG. 5 is a cross-sectional view showing a D-D ′ cross section of the inner ring 20 shown in FIG. 4. It is explanatory drawing which shows a part of 1st conductor 16 and the columnar conductor 17 currently formed in the 1st plane 11a.
  • FIG. 3 is a cross-sectional view showing a C-C ′ cross section of the outer ring 10 shown in FIG. 2.
  • FIG. 5 is a cross-sectional view showing a D-D ′ cross section of the inner ring 20 shown in FIG. 4.
  • FIG. 6 is a plan view of another example of the outer ring 10 in the rotary transformer 1 for an ultrasonic flaw detector as seen from the x 1 direction in FIG. 1.
  • FIG. 7 is a plan view of another example of the inner ring 20 in the rotary transformer 1 for the ultrasonic flaw detector, viewed from the x 2 direction in FIG. 1.
  • FIG. 6 is a plan view of another example of the outer ring 10 in the rotary transformer 1 for an ultrasonic flaw detector as seen from the x 1 direction in FIG. 1.
  • FIG. 15 is a cross-sectional view showing a C-C ′ cross section of the outer ring 10 shown in FIG. 14.
  • FIG. 7 is a plan view of another example of the inner ring 20 in the rotary transformer 1 for the ultrasonic flaw detector, viewed from the x 2 direction in FIG. 1.
  • FIG. 17 is a cross-sectional view showing a D-D ′ cross section of the inner ring 20 shown in FIG. 16. It is explanatory drawing which shows the rotary transformer 1 provided with four outer rings and four inner rings.
  • FIG. 1 is a configuration diagram showing an ultrasonic flaw detector according to the first embodiment.
  • FIG. 2 is a plan view of the outer ring 10 in the rotary transformer 1 for an ultrasonic flaw detector as viewed from the x 1 direction in FIG.
  • FIG. 3 is a cross-sectional view showing a CC ′ cross section of the outer ring 10 shown in FIG.
  • FIG. 4 is a plan view of the inner ring 20 in the rotary transformer 1 for an ultrasonic flaw detector as viewed from the x 2 direction in FIG. 1.
  • FIG. 5 is a sectional view showing a DD ′ section of the inner ring 20 shown in FIG.
  • the rotary transformer 1 includes a fixed body 5 and a rotary body 6.
  • the outer frame 2 is a housing of the rotary transformer 1 and holds the fixed body 5.
  • the inner wall 3 is in contact with the outer frame 2 via the rotation mechanism 4.
  • the inner wall 3 holds the inner ring 20 so that the inner ring 20 faces the outer ring 10.
  • the rotation mechanism 4 is a mechanism that relatively rotates the inner wall 3 with respect to the outer frame 2. As the inner wall 3 rotates, the inner ring 20 and the ultrasonic probes 32a, 32b, 32c, 32d rotate around the inspected material 7.
  • the inspected material 7 is an inspection target of the ultrasonic flaw detector.
  • the fixed body 5 includes an outer ring 10.
  • the outer ring 10 is attached to the outer frame 2 and has a first substrate 11 and a first holding member 14.
  • First 1-turn coils 12a, 12b, 12c, 12d are concentrically formed on the first plane 11a of the first substrate 11.
  • One end of each of the first one-turn coils 12a, 12b, 12c, 12d is connected to one end of each of the stationary signal lines 43a, 43b, 43c, 43d, and the other end is connected to the ground.
  • the first floating conductor 13 is formed on the second plane 11 b of the first substrate 11.
  • the first floating conductor 13 is a non-magnetic metal such as copper.
  • the first holding member 14 holds the first substrate 11 in a non-contact state with the first floating conductor 13 so as to surround the first floating conductor 13.
  • the first holding member 14 is a metal such as iron or aluminum and is grounded.
  • the first holding member 14 may be non-metallic, but when the first holding member 14 is non-metallic, the first floating conductor 13 needs to be grounded.
  • the first conductor 16 and the first floating conductor 13 are electrically connected, and the first conductor 16 is grounded.
  • the inside of the first holding member 14 is air 15.
  • the inside of the first holding member 14 may be an insulator having a relative magnetic permeability substantially equal to 1 instead of the air 15.
  • the first conductor 16 is provided between the first 1-turn coil 12a and the first 1-turn coil 12b and between the first 1-turn coil 12b and the first 1-turn coil 12c on the first plane 11a. And the first 1-turn coil 12c and the first 1-turn coil 12d, respectively.
  • the first conductor 16 is grounded.
  • the columnar conductor 17 is, for example, a via, and the columnar conductor 17 electrically connects the first conductor 16 and the first floating conductor 13.
  • FIG. 6 is an explanatory diagram showing a part of the first conductors 16 and the columnar conductors 17 formed on the first plane 11a. In the example of FIG. 6, the first conductor 16 is electrically connected to the first floating conductor 13 by the two columnar conductors 17.
  • the through hole 18 is a hole into which the inspection target material 7 to be inspected is inserted.
  • the rotating body 6 includes an inner ring 20 and ultrasonic probes 32a, 32b, 32c, 32d and the like.
  • the inner ring 20, the ultrasonic probes 32a, 32b, 32c, 32d, etc. are rotated around the inspection target material 7 by the rotating mechanism 4.
  • the inner ring 20 is attached to the inner wall 3, and includes a second substrate 21 and a second holding member 24.
  • Second one-turn coils 22a, 22b, 22c, 22d are concentrically formed on the third plane 21a of the second substrate 21.
  • One end of each of the second one-turn coils 22a, 22b, 22c, 22d is connected to one end of each of the rotation-side signal lines 33a, 33b, 33c, 33d, and the other end is connected to the ground.
  • the second floating conductor 23 is formed on the fourth plane 21 b of the second substrate 21.
  • the second floating conductor 23 is a non-magnetic metal such as copper.
  • the second holding member 24 holds the second substrate 21 in a non-contact state with the second floating conductor 23 so as to surround the second floating conductor 23.
  • the second holding member 24 is a metal such as iron or aluminum and is grounded.
  • the second holding member 24 may be non-metallic, but when the second holding member 24 is non-metallic, the second floating conductor 23 needs to be grounded.
  • the second conductor 26 and the second floating conductor 23 are electrically connected, and the second conductor 26 is grounded.
  • the inside of the second holding member 24 is air 25.
  • the inside of the second holding member 24 may be an insulator having a relative magnetic permeability substantially equal to 1 instead of the air 25.
  • the second conductor 26 is provided between the second 1-turn coil 22a and the second 1-turn coil 22b and between the second 1-turn coil 22b and the second 1-turn coil 22c on the third plane 21a. And the second 1-turn coil 22c and the second 1-turn coil 22d, respectively.
  • the second conductor 26 is grounded.
  • the columnar conductor 27 is, for example, a via similar to the columnar conductor 17.
  • the columnar conductor 27 electrically connects the second conductor 26 and the second floating conductor 23.
  • the through hole 28 is a hole into which the inspection target material 7 to be inspected is inserted.
  • the ultrasonic probe holder 31 holds the ultrasonic probes 32a, 32b, 32c, 32d, and is rotated together with the inner wall 3.
  • the ultrasonic probe 32a is connected to the second one-turn coil 22a via the rotation-side signal line 33a.
  • the ultrasonic probe 32b is connected to the second one-turn coil 22b via the rotation-side signal line 33b.
  • the ultrasonic probe 32c is connected to the second one-turn coil 22c via the rotation-side signal line 33c.
  • the ultrasonic probe 32d is connected to the second one-turn coil 22d via the rotation-side signal line 33d.
  • the rotation-side signal lines 33a, 33b, 33c, 33d are signal lines for transmitting electric signals.
  • One end of each of the rotation-side signal lines 33a, 33b, 33c, 33d is connected to one end of each of the second one-turn coils 22a, 22b, 22c, 22d.
  • the other end of each of the rotation side signal lines 33a, 33b, 33c, 33d is connected to each of the ultrasonic probes 32a, 32b, 32c, 32d.
  • Each of the ultrasonic probes 32a, 32b, 32c, 32d receives an electric signal from each of the second one-turn coils 22a, 22b, 22c, 22d via the rotation side signal lines 33a, 33b, 33c, 33d. Then, the ultrasonic wave corresponding to the electric signal is emitted to the inspection object 7.
  • each of the ultrasonic probes 32a, 32b, 32c, 32d receives the ultrasonic wave reflected by the material 7 to be inspected, it receives the ultrasonic wave through the rotation side signal lines 33a, 33b, 33c, 33d. The corresponding electric signal is output to the second one-turn coils 22a, 22b, 22c, 22d.
  • the signal input / output unit 40 includes transmitting units 41a, 41b, 41c, 41d and receiving units 42a, 42b, 42c, 42d, and outputs an electric signal to the first 1-turn coils 12a, 12b, 12c, 12d. Input and output.
  • Each of the transmitter 41a and the receiver 42a is connected to the first one-turn coil 12a via the stationary signal line 43a.
  • Each of the transmitter 41b and the receiver 42b is connected to the first one-turn coil 12b via the stationary signal line 43b.
  • Each of the transmitter 41c and the receiver 42c is connected to the first one-turn coil 12c via the stationary signal line 43c.
  • Each of the transmitter 41d and the receiver 42d is connected to the first one-turn coil 12d via the stationary side signal line 43d.
  • the stationary signal lines 43a, 43b, 43c, 43d are signal lines for transmitting electric signals.
  • One end of each of the stationary signal lines 43a, 43b, 43c, 43d is connected to one end of each of the first one-turn coils 12a, 12b, 12c, 12d.
  • the other end of each of the stationary-side signal lines 43a, 43b, 43c, 43d is connected to each of the transmitters 41a, 41b, 41c, 41d and each of the receivers 42a, 42b, 42c, 42d. There is.
  • each of the transmitters 41a, 41b, 41c, 41d receives the control signal for instructing the transmission of the electric signal from the flaw detector 44
  • the transmitter 41a, 41b, 41c, 41d transmits the electric signal to the first via the stationary side signal lines 43a, 43b, 43c, 43d. 1 turn coil 12a, 12b, 12c, 12d.
  • each of the transmission units 41 a, 41 b, 41 c, 41 d outputs the same electric signal as the above electric signal to the flaw detection unit 44.
  • Each of the receivers 42a, 42b, 42c, 42d receives the electric signal output from the first one-turn coil 12a, 12b, 12c, 12d via the stationary side signal lines 43a, 43b, 43c, 43d. , And outputs an electrical signal to the flaw detection unit 44.
  • the flaw detection unit 44 is realized by dedicated hardware such as a flaw detection circuit.
  • the flaw detection circuit is, for example, a single circuit, a composite circuit, a programmed processor, a parallel programmed processor, an ASIC (Application Specific Integrated Circuit), an FPGA (Field-Programmable Gate Array), or a combination thereof. To do.
  • the flaw detection unit 44 outputs a control signal instructing the transmission of the electric signal to each of the transmission units 41a, 41b, 41c, 41d.
  • the flaw detection unit 44 detects a flaw on the inspected material 7 based on the electric signals output from the transmission units 41a, 41b, 41c, 41d and the electric signals output from the reception units 42a, 42b, 42c, 42d.
  • the flaw detection circuit is not limited to being realized by dedicated hardware, but may be realized by software, firmware, or a combination of software and firmware.
  • the rotation mechanism 4 rotates the inner wall 3 relative to the outer frame 2 when detecting the material to be inspected 7.
  • the inner ring 20 and the ultrasonic probes 32a, 32b, 32c, 32d rotate around the inspected material 7.
  • the flaw detection unit 44 outputs a control signal instructing the transmission of the electric signal to each of the transmission units 41a, 41b, 41c, 41d.
  • each of the transmission units 41a, 41b, 41c, 41d Upon receiving the control signal from the flaw detection unit 44, each of the transmission units 41a, 41b, 41c, 41d sends a pulse signal, for example, as a first electric signal via the stationary signal lines 43a, 43b, 43c, 43d. It transmits to 1 turn coil 12a, 12b, 12c, 12d.
  • each of the transmission units 41 a, 41 b, 41 c, 41 d outputs the same electric signal as the above electric signal to the flaw detection unit 44.
  • the first 1-turn coil 12a is arranged so as to face the second 1-turn coil 22a, and the first 1-turn coil 12b is connected to the second 1-turn coil 22b. It is arranged to face each other.
  • the first 1-turn coil 12c is arranged so as to face the second 1-turn coil 22c, and the first 1-turn coil 12d is arranged so as to face the second 1-turn coil 22d.
  • FIG. 7 is an explanatory diagram showing non-contact transmission between the first 1-turn coils 12a, 12b, 12c, 12d and the second 1-turn coils 22a, 22b, 22c, 22d.
  • the electric signal flowing through the first 1-turn coil 12a is contactlessly transmitted to the second 1-turn coil 22a, and the electric signal flowing through the first 1-turn coil 12b is not transmitted to the second 1-turn coil 22b.
  • Contact is transmitted.
  • the electric signal flowing through the first 1-turn coil 12c is contactlessly transmitted to the second 1-turn coil 22c, and the electric signal flowing through the first 1-turn coil 12d is not transmitted to the second 1-turn coil 22d.
  • Contact is transmitted.
  • the contactless transmission of the electric signal is transmitted, for example, by capacitive coupling between the first 1-turn coils 12a, 12b, 12c, 12d and the second 1-turn coils 22a, 22b, 22c, 22d. It is a thing.
  • the electric signal transmitted to the second 1-turn coil 22a in a non-contact manner is transmitted to the ultrasonic probe 32a via the rotation-side signal line 33a and transmitted to the second 1-turn coil 22b in a non-contact manner.
  • the signal is transmitted to the ultrasonic probe 32b via the rotation-side signal line 33b.
  • the electric signal non-contactly transmitted to the second one-turn coil 22c is transmitted to the ultrasonic probe 32c via the rotation side signal line 33c, and the non-contact electric signal is transmitted to the second one-turn coil 22d.
  • the signal is transmitted to the ultrasonic probe 32d via the rotation side signal line 33d.
  • Each of the ultrasonic probes 32a, 32b, 32c, 32d converts the transmitted electric signal into an ultrasonic wave and radiates the ultrasonic wave to the inspection object 7. Since each of the ultrasonic probes 32a, 32b, 32c, 32d rotates around the inspected material 7, the emission position of the ultrasonic wave with respect to the inspected material 7 changes with the passage of time. The ultrasonic waves emitted from each of the ultrasonic probes 32a, 32b, 32c, 32d are reflected by the inspection object 7. The echo height of the ultrasonic wave reflected by the material 7 to be inspected changes depending on whether the ultrasonic wave is radiated or not.
  • each of the ultrasonic probes 32a, 32b, 32c, 32d When each of the ultrasonic probes 32a, 32b, 32c, 32d receives the ultrasonic wave reflected by the inspected material 7, it converts the received ultrasonic wave into an electric signal. Each of the ultrasonic probes 32a, 32b, 32c, 32d outputs the electric signal to the second one-turn coils 22a, 22b, 22c, 22d via the rotation side signal lines 33a, 33b, 33c, 33d. To do.
  • the electrical signal transmitted to the second 1-turn coil 22a is contactlessly transmitted to the first 1-turn coil 12a, and the electrical signal transmitted to the second 1-turn coil 22b is It is transmitted in a non-contact manner to the first one-turn coil 12b.
  • the electric signal transmitted to the second one-turn coil 22c is contactlessly transmitted to the first one-turn coil 12c, and the electric signal transmitted to the second one-turn coil 22d is the first one-turn coil. It is transmitted to the coil 12d in a non-contact manner.
  • Each of the electric signals transmitted to the first one-turn coil 12a, 12b, 12c, 12d in a non-contact manner is transmitted to the receivers 42a, 42b, 42c, 42d via the stationary signal lines 43a, 43b, 43c, 43d. Is transmitted.
  • Each of the receivers 42a, 42b, 42c, 42d receives the electrical signal output from the first one-turn coil 12a, 12b, 12c, 12d and outputs the electrical signal to the flaw detector 44.
  • the flaw detection unit 44 detects a flaw on the inspected material 7 based on the electric signals output from the transmission units 41a, 41b, 41c, 41d and the electric signals output from the reception units 42a, 42b, 42c, 42d. To do.
  • the method of detecting a flaw in the material 7 to be inspected is a known technique, and thus detailed description thereof will be omitted.
  • the flaw detection unit 44 can use the following detection method. [Detection method]
  • the presence or absence of scratches at the ultrasonic wave radiation position is detected from the difference.
  • the flaw detection unit 44 is configured such that the rotation speed of the inner wall 3 by the rotation mechanism 4 and the time interval of the pulse signal which is the electric signal transmitted from the transmission units 41a, 41b, 41c, 41d. In, it is known. Therefore, in the flaw detection unit 44, the position where the ultrasonic waves are radiated from the ultrasonic probes 32a, 32b, 32c, 32d to the inspection object 7 is known.
  • the distance between the first and second substrates and the first and second holding members is It secures 5 to 10 times the gap between one 1-turn coil and the second 1-turn coil.
  • the first floating conductor 13 is formed on the second plane 11b of the first substrate 11, and the second floating conductor 23 is formed on the fourth plane 21b of the second substrate 21. Has been formed.
  • the first floating conductor 13 acts so as to shield the magnetic flux between the first one-turn coil 12a, 12b, 12c, 12d and the first holding member 14.
  • the second floating conductor 23 acts so as to shield the magnetic flux between the second one-turn coils 22a, 22b, 22c, 22d and the second holding member 24. Therefore, even if an electric signal flows through the first one-turn coils 12a, 12b, 12c, and 12d to generate magnetic flux, the magnetic flux almost reaches the first holding member 14 due to the shield effect of the first floating conductor 13. Will not do. Since the magnetic flux hardly reaches the first holding member 14, the eddy current loss, the hysteresis loss, and the like generated in the first holding member 14 are significantly suppressed.
  • the magnetic flux almost reaches the second holding member 24 due to the shield effect of the second floating conductor 23. Will not do. Since the magnetic flux hardly reaches the second holding member 24, the eddy current loss or the hysteresis loss generated in the second holding member 24 is significantly suppressed.
  • the distance W between the second flat surface 11b of the first substrate 11 and the first holding member 14 is between the first one-turn coil 12a and the second one-turn coil 22a. Even if the gap is shorter than 5 to 10 times, the influence of the electromagnetic induction phenomenon can be eliminated. Therefore, in the rotary transformer 1 shown in FIG. 1, the outer ring 10 can be made thinner than the rotary transformer disclosed in Patent Document 1. Further, the distance W between the fourth flat surface 21b of the second substrate 21 and the second holding member 24 is the gap between the first 1-turn coil 12a and the second 1-turn coil 22a. Even if it is shorter than 5 to 10 times, it is possible to eliminate the influence of the electromagnetic induction phenomenon. Therefore, in the rotary transformer 1 shown in FIG. 1, the inner ring 20 can be made thinner than the rotary transformer disclosed in Patent Document 1. By making the outer ring 10 thinner and the inner ring 20 thinner, the physical strength of the rotary transformer 1 is increased.
  • FIG. 8 is an explanatory diagram showing the occurrence of crosstalk.
  • 51 is the crosstalk that the electric signal output from the second 1-turn coil 22d exerts on the second 1-turn coil 22c
  • 52 is the output from the second 1-turn coil 22d. This is the crosstalk that the electric signal exerts on the first one-turn coil 12c.
  • the electric signal output from the second one-turn coil 22d serves as a crosstalk generation source.
  • FIG. 9 is an explanatory diagram showing suppression of crosstalk.
  • x indicates that the crosstalks 51 and 52 are suppressed.
  • the fixed body 5 has the first holding member 14 that holds the first substrate 11 so as to surround the first floating conductor 13, and the rotating body 6 is the second holding member 14.
  • the rotary transformer 1 is configured so as to have the second holding member 24 that holds the second substrate 21 so as to surround the floating conductor 23. Therefore, the rotary transformer 1 includes the distance W between the first substrate 11 and the first holding member 14 and the second substrate 21 and the second holding member 24 in order to eliminate the influence of the electromagnetic induction phenomenon. It is possible to eliminate the influence of the electromagnetic induction phenomenon without increasing each of the distances W between them. Therefore, in comparison with the rotary transformer disclosed in Patent Document 1, the rotary transformer 1 has a distance W between the first substrate 11 and the first holding member 14, and the second substrate 21 and the second holding member 14. Each of the distances W with the holding member 24 becomes shorter, and the thickness of each of the fixed body 5 and the rotating body 6 becomes thinner.
  • the first conductor 16 and the first floating conductor 13 are electrically connected, and the second conductor 26 and the second floating conductor 23 are electrically connected,
  • the rotary transformer 1 is configured such that the first conductor 16 and the second conductor 26 are grounded. Therefore, each of the first floating conductor 13 and the second floating conductor 23 is electrically grounded without individually electrically grounding each of the first floating conductor 13 and the second floating conductor 23. It will be in a state of being.
  • the first holding member 14 holds the first substrate 11 in a state of not contacting the first floating conductor 13 so as to surround the first floating conductor 13.
  • the second holding member 24 holds the second substrate 21 in a state of not contacting the second floating conductor 23 so as to surround the second floating conductor 23.
  • FIG. 10 is a cross-sectional view showing a CC ′ cross section of the outer ring 10 shown in FIG. Further, in the inner ring 20, as shown in FIG. 11, the second floating conductor 23 is formed on the entire surface of the fourth plane 21b, and the second holding member 24 contacts the second floating conductor 23. You may make it hold
  • FIG. 11 is a sectional view showing a DD ′ section of the inner ring 20 shown in FIG.
  • the shield effect of the first floating conductor 13 can be enhanced more than in the case where the first substrate 11 is held in a state of not being in contact with the floating conductor 13.
  • the second holding member 24 holds the second substrate 21 in a state where the second holding member 24 is in contact with the second floating conductor 23 formed on the entire surface of the fourth flat surface 21b.
  • the shield effect of the second floating conductor 23 can be enhanced more than in the case where the second substrate 21 is held in a state of not being in contact with the floating conductor 23.
  • the first conductor 16 is grounded, but the grounding method of the first conductor 16 is not specified.
  • the conductor 61 whose one end is connected to the first holding member 14 is connected to the first plane 11a of the first substrate 11 as shown in FIG.
  • the plurality of first conductors 16 may be connected to the conductor 61.
  • one ends of the first one-turn coils 12 a, 12 b, 12 c, 12 d are also connected to the conductor 61.
  • FIG. 12 is a plan view of another example of the outer ring 10 in the rotary transformer 1 for an ultrasonic flaw detector as seen from the x 1 direction in FIG. 1.
  • FIG. 13 is a plan view of another example of the inner ring 20 in the rotary transformer 1 for the ultrasonic flaw detector as seen from the x 2 direction in FIG. 1.
  • the outer ring 10 shown in FIG. 2 has a structure in which a part of the first holding member 14 is visible when the outer ring 10 is viewed from the x 1 direction in FIG.
  • the inner ring 20 shown in FIG. 4 has a structure in which a part of the second holding member 24 is visible when the inner ring 20 is viewed from the x 2 direction in FIG.
  • FIGS. 14 and 15 when the outer ring 10 is viewed from the x 1 direction in FIG. 1, the first holding member 14 is not visible. It may be a structure.
  • FIG. 14 is a plan view of another example of the outer ring 10 in the rotary transformer 1 for an ultrasonic flaw detector as seen from the x 1 direction in FIG. 1.
  • FIG. 14 is a plan view of another example of the outer ring 10 in the rotary transformer 1 for an ultrasonic flaw detector as seen from the x 1 direction in FIG. 1.
  • FIG. 14 is a plan view of another example of the outer ring 10 in the rotary transformer 1 for an ultras
  • FIG. 15 is a sectional view showing a CC ′ section of the outer ring 10 shown in FIG.
  • the inner ring 20 may have a structure in which the second holding member 24 is not visible when the inner ring 20 is viewed from the x 2 direction in FIG. 1.
  • FIG. 16 is a plan view of another example of the inner ring 20 in the rotary transformer 1 for the ultrasonic flaw detector as seen from the x 2 direction in FIG. 1.
  • FIG. 17 is a sectional view showing a DD ′ section of the inner ring 20 shown in FIG.
  • each of the other ends of the first one-turn coils 12a, 12b, 12c, 12d is connected to the ground. Further, each of the other ends of the second one-turn coils 22a, 22b, 22c, 22d is connected to the ground.
  • the present invention is not limited to this, and the other ends of the first 1-turn coils 12a, 12b, 12c, 12d are opened, and the other ends of the second 1-turn coils 22a, 22b, 22c, 22d are opened. It may be open.
  • each of the transmitters 41a, 41b, 41c, 41d transmits an electric signal to the stationary side signal lines 43a, 43b, 43c, 43d, the first one-turn coil 12a, A voltage is applied to 12b, 12c and 12d.
  • a voltage is applied to the first 1-turn coils 12a, 12b, 12c, 12d
  • a voltage is applied to the second 1-turn coils 22a, 22b, 22c, 22d by capacitive coupling, and the rotation-side signal line 33a
  • Electrical signals are transmitted to the ultrasonic probes 32a, 32b, 32c, 32d via 33b, 33c, 33d.
  • the second 1-turn coils 22a, 22b, 22c, 22d output the signals. Is applied with a voltage.
  • the voltage is applied to the second one-turn coils 22a, 22b, 22c, 22d
  • the voltage is applied to the first one-turn coils 12a, 12b, 12c, 12d by capacitive coupling, and the stationary side signal line 43a
  • An electric signal is transmitted to the receiving units 42a, 42b, 42c, 42d via 43b, 43c, 43d.
  • Embodiment 2 In the ultrasonic flaw detector shown in FIG. 1, the rotary transformer 1 includes one outer ring 10 and one inner ring 20. In the second embodiment, an ultrasonic flaw detector will be described in which the rotary transformer 1 includes a plurality of outer rings and a plurality of inner rings.
  • the ultrasonic flaw detector may be equipped with a large number of ultrasonic probes 32a and the like in order to enable flaw detection at many points on the material 7 to be inspected at the same time.
  • the ultrasonic flaw detector mounts more ultrasonic probes 32a than the number of second one-turn coils 22a, 22b, 22c, 22d formed on one inner ring 20, the rotary transformer 1
  • FIG. 18 is an explanatory diagram showing the rotary transformer 1 including four outer rings and four inner rings.
  • FIG. 18 illustrates an example in which the rotary transformer 1 includes four outer rings and four inner rings. However, this is only an example, and the rotary transformer 1 may be provided with two or three outer rings and two or three inner rings. Further, the rotary transformer 1 may include five or more outer rings and five or more inner rings.
  • the outer frame 2, the inner wall 3, the rotation mechanism 4, the ultrasonic probe holder 31, the ultrasonic probes 32a, 32b, 32c, 32d and the rotation side signal lines 33a, 33b. , 33c, 33d, etc. are omitted. 18, the same reference numerals as those in FIG. 3 and FIG.
  • the outer ring 10 is an outer ring having the same configuration as the outer ring 10 shown in FIG.
  • the outer ring 10 a includes two outer rings corresponding to the outer ring 10.
  • the first holding member 14a holds the two first substrates 11 so that the respective second planes 11b of the two first substrates 11 face each other.
  • the inner ring 20a includes two inner rings corresponding to the inner ring 20.
  • the second holding member 24a holds the two second substrates 21 so that the respective fourth planes 21b of the two second substrates 21 face each other.
  • each outer ring is thinned and each inner ring is thin similarly to the rotary transformer 1 of the first embodiment. Can be realized.
  • the present invention is suitable for a rotary transformer for an ultrasonic flaw detector that includes a fixed body and a rotating body. Further, the present invention is suitable for an ultrasonic flaw detector equipped with a rotary transformer.

Landscapes

  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)

Abstract

L'invention concerne un transformateur rotatif (1) qui est configuré pour comprendre : un corps fixe (5) ayant un premier substrat (11) dans lequel des premières bobines à spire unique (12a) à (12d) sont formées de manière concentrique sur un premier plan (11a), et un premier conducteur flottant (13) est formé sur un deuxième plan (11b), et un premier élément de maintien (14) maintenant le premier substrat (11) de manière à entourer le premier conducteur flottant (13) ; et un corps rotatif (6) qui possède un second substrat (21) dans lequel des secondes bobines à spire unique (22a) à (22d) sont formées de manière concentrique sur un troisième plan (21a) de façon à faire face aux premières bobines à spire unique (12a) à (12d), respectivement, et un second conducteur flottant (23) est formé sur un quatrième plan (21b), un second élément de maintien (24) qui maintient le second substrat (21) de manière à entourer le second conducteur flottant (23), et des sondes ultrasonores (32a) à (32d) connectées aux secondes bobines à spire unique (22a) à (22d), respectivement, et le second substrat (21), le second élément de maintien (24) et les sondes ultrasonores (32a) à (32d) tournent autour d'un matériau à inspecter (7).
PCT/JP2018/039039 2018-10-19 2018-10-19 Transformateur rotatif pour détecteur de défauts ultrasonore et détecteur de défauts ultrasonore WO2020079836A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
PCT/JP2018/039039 WO2020079836A1 (fr) 2018-10-19 2018-10-19 Transformateur rotatif pour détecteur de défauts ultrasonore et détecteur de défauts ultrasonore
JP2019529659A JP6669313B1 (ja) 2018-10-19 2018-10-19 超音波探傷装置用の回転トランス及び超音波探傷装置

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2018/039039 WO2020079836A1 (fr) 2018-10-19 2018-10-19 Transformateur rotatif pour détecteur de défauts ultrasonore et détecteur de défauts ultrasonore

Publications (1)

Publication Number Publication Date
WO2020079836A1 true WO2020079836A1 (fr) 2020-04-23

Family

ID=70000693

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2018/039039 WO2020079836A1 (fr) 2018-10-19 2018-10-19 Transformateur rotatif pour détecteur de défauts ultrasonore et détecteur de défauts ultrasonore

Country Status (2)

Country Link
JP (1) JP6669313B1 (fr)
WO (1) WO2020079836A1 (fr)

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5472423A (en) * 1977-11-21 1979-06-09 Mitsubishi Electric Corp Rotary transformer
JPS599906A (ja) * 1982-07-09 1984-01-19 Trio Kenwood Corp 回転変圧器
JPS59143012U (ja) * 1983-03-14 1984-09-25 日本フエライト株式会社 ロ−タリ−トランス
JPH01158707A (ja) * 1987-12-15 1989-06-21 Toshiba Corp 回転トランス及びその製造方法
JPH01154615U (fr) * 1988-04-15 1989-10-24
JP2002301081A (ja) * 2001-04-06 2002-10-15 Matsushita Electric Ind Co Ltd 超音波振動子駆動モータとそのモータを使用した超音波診断装置
WO2012141279A1 (fr) * 2011-04-15 2012-10-18 新日本製鐵株式會社 Transformateur rotatif pour dispositif rotatif de détection des défauts à ultrasons, et dispositif rotatif de détection des défauts à ultrasons utilisant ce transformateur
US20150145626A1 (en) * 2012-05-10 2015-05-28 Hispano-Suiza Magnetically shielded three phase rotary transformer having three magnetic cores

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5472423A (en) * 1977-11-21 1979-06-09 Mitsubishi Electric Corp Rotary transformer
JPS599906A (ja) * 1982-07-09 1984-01-19 Trio Kenwood Corp 回転変圧器
JPS59143012U (ja) * 1983-03-14 1984-09-25 日本フエライト株式会社 ロ−タリ−トランス
JPH01158707A (ja) * 1987-12-15 1989-06-21 Toshiba Corp 回転トランス及びその製造方法
JPH01154615U (fr) * 1988-04-15 1989-10-24
JP2002301081A (ja) * 2001-04-06 2002-10-15 Matsushita Electric Ind Co Ltd 超音波振動子駆動モータとそのモータを使用した超音波診断装置
WO2012141279A1 (fr) * 2011-04-15 2012-10-18 新日本製鐵株式會社 Transformateur rotatif pour dispositif rotatif de détection des défauts à ultrasons, et dispositif rotatif de détection des défauts à ultrasons utilisant ce transformateur
US20150145626A1 (en) * 2012-05-10 2015-05-28 Hispano-Suiza Magnetically shielded three phase rotary transformer having three magnetic cores

Also Published As

Publication number Publication date
JP6669313B1 (ja) 2020-03-18
JPWO2020079836A1 (ja) 2021-02-15

Similar Documents

Publication Publication Date Title
US11146892B1 (en) Magnetic field canceling audio devices
EP3514502B1 (fr) Capteur de position inductif
US8479577B2 (en) In-line inspection tool for pipeline integrity testing
JP6189870B2 (ja) 貫通コイル構成、貫通コイル構成を有する試験装置、及び試験方法
KR101061590B1 (ko) 자기 변형 트랜스듀서, 이를 이용한 구조 진단 장치 및 구조 진단 방법
US4727321A (en) Method and device for magnetic and ultrasonic testing of ferro-magnetic objects
AU2017235769B2 (en) Guided wave testing
US8806949B2 (en) Electromagnetic ultrasound transducer
WO2020079836A1 (fr) Transformateur rotatif pour détecteur de défauts ultrasonore et détecteur de défauts ultrasonore
US9664650B2 (en) Omni-directional shear-horizontal wave electromagnetic acoustic transducer
CN103207239A (zh) 一种一体化可调节磁致伸缩纵向导波探头
JP2009145056A (ja) 電磁超音波探触子および電磁超音波探傷装置
JP2012127752A (ja) 電磁流速計および電磁流速計部品ならびに流速測定方法
EP3525013A1 (fr) Détecteur et localisateur d'inclusions ferromagnétiques dans un milieu à passage continu
EP3388806A1 (fr) Dispositif de mesure de force circonférentielle
US20230352281A1 (en) Electromagnetic field signal acquisition system for high signal-to-noise ratios, and electrical noise immunity
US11460442B2 (en) Pipeline tool with composite magnetic field for inline inspection
JP7091963B2 (ja) 物体検知センサおよび物体検知システム
EP3798567A1 (fr) Procédé et système permettant de déterminer l'épaisseur d'un tuyau
JP2006071606A (ja) 磁性物体検出装置
RU2584274C1 (ru) Электромагнитно-акустический преобразователь для контроля ферромагнитных материалов
UA116248U (uk) Ультразвуковий роздільно-поєднаний електромагнітно-акустичний перетворювач для контролю феромагнітних металовиробів
JPH01139046A (ja) 核磁気共鳴を用いた検査装置
JP2010019802A (ja) 回転電機の回転検出装置

Legal Events

Date Code Title Description
ENP Entry into the national phase

Ref document number: 2019529659

Country of ref document: JP

Kind code of ref document: A

121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 18936926

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 18936926

Country of ref document: EP

Kind code of ref document: A1