JP4328326B2 - Magnetic field generation method - Google Patents

Description

  The present invention relates to a magnetic field generation method, and more particularly to a magnetic field generation method for generating a desired wavelength magnetic field by supplying a current to a coil.

  Conventionally, a superconducting magnet (SCM) used in a superconducting magnetic levitation railway is a cart that is running by configuring an N-shaped short coil (levitation coil) and null flux arrangement continuously arranged on the side wall of the guideway. In response to this displacement, a restoring force (levitation force) to a magnetic neutral position is generated, and at the same time, it is used as a field pole of a propulsion system by facing the armature coil.

  Here, since both the levitation system and the propulsion system use concentrated air cores for the ground coil, the magnetic field from the ground coil observed on the superconducting magnet is accompanied by harmonic components in addition to the fundamental wave that proceeds synchronously. This causes AC loss, vibration, and heat generation due to vibration of the superconducting magnet. Durability and reliability against these vibrations and heat loads are important evaluation items for superconducting magnets, and many tests have been conducted so far. One of them is an electromagnetic excitation test, which uses a magnetic excitation coil placed opposite to a superconducting magnet to generate a harmonic magnetic field that simulates running while stationary, and evaluates the above performance of the superconducting magnet. Is. Not only can the basic performance be confirmed before the running test, but it can also play a complementary role for items that cannot be completely evaluated by running tests, such as elucidating vibration phenomena using changes in the excitation force condition. In the future, its usefulness is expected to increase like a bogie tester in an iron wheel-rail system.

On the other hand, with regard to recent efforts related to test equipment, the study of the equivalence between electromagnetic excitation and actual running is still ongoing, and the method of supporting the load on the carriage is the same as the actual running by magnetically supporting the carriage. A method of performing electromagnetic excitation under conditions and reproducing the vibration characteristics of a bogie vehicle is known (Patent Document 1).
JP2004-282956

  However, since the excitation method described in Patent Document 1 only simulates one type of spatial harmonic, it is necessary to newly manufacture a coil in order to simulate another harmonic component. was there.

  The present invention has been made to solve the above-described problems, and an object thereof is to provide a magnetic field generation method capable of generating a magnetic field having a plurality of wavelengths.

  In order to achieve the above object, a magnetic field generation method according to a first aspect of the present invention includes a first inverter that generates a first three-phase current, and a phase difference with respect to the first three-phase current, A second inverter for generating a second three-phase current having a phase difference for generating a current in a phase between one three-phase current and a phase opposite to the first three-phase current; and an even number of three A plurality of coils adjacent to each other, and a first coil group arranged such that the direction of the magnetic field passing through the center of the coil faces the direction intersecting the coil arrangement direction, and the coils of the first coil group Each of the even number of coils corresponding to each of the three is made adjacent to each other while being shifted in the coil arrangement direction by an amount corresponding to the phase difference at the generated magnetic field wavelength, and the direction of the magnetic field passing through the center of the coil is the coil. Arranged to face the direction that intersects the array direction A magnetic field generating method of a magnetic field generator comprising: a second coil group; a connection state between each of the coils of the first coil group and the first inverter; and the second coil group. A connection state between each of the coils and the second inverter is changed to generate a plurality of combined magnetic fields having different wavelengths.

  According to the magnetic field generation method according to the first invention, the first inverter is connected to the positive terminal of the coil of the first coil group in accordance with the phase of the current supplied to each of the coils of the first coil group. To supply the first three-phase current. In addition, the first inverter is connected to the negative terminal instead of the positive terminal of the coil, and a current having a phase opposite to the first three-phase current is supplied to the coil. Similarly, the second inverter is connected to the positive terminal of the coil of the second coil group in accordance with the phase of the current supplied to each of the coils of the second coil group. And a second inverter is connected to the negative terminal of the coil to supply a reverse phase of the second three-phase current.

  At this time, each of the coils of the first coil group and each of the corresponding coils of the second coil group are coils by an amount corresponding to the phase difference between the first three-phase current and the second three-phase current. The first coil group generates a magnetic field corresponding to the first three-phase current and the current opposite to the first three-phase current from the first coil group. A magnetic field is generated according to the current in the opposite phase of the three-phase current and the second three-phase current. Then, the magnetic field from the first coil group and the magnetic field from the second coil group are combined, the magnetic field having a predetermined wavelength is increased, and a combined magnetic field having a predetermined wavelength is generated.

  Further, the connection state between each of the coils in the first coil group and the first inverter is changed, the connection state between each of the coils in the second coil group and the second inverter is changed, and the first The phase difference of the current supplied to the coil of the coil group and the corresponding coil of the second coil group is changed. Then, the magnetic field from the first coil group and the magnetic field from the second coil group are combined, the magnetic field having a wavelength different from the above is increased, and a combined magnetic field having a wavelength different from the above is generated.

  Similarly, the connection state between each of the coils of the first coil group and the first inverter is further changed, and the connection state between each of the coils of the second coil group and the second inverter is further changed, The phase difference of the current supplied to the coil of the first coil group and the corresponding coil of the second coil group is further changed to generate a plurality of synthesized magnetic fields having different wavelengths.

  Accordingly, the connection state between each of the coils of the first coil group and the first inverter that generates the first three-phase current is changed, and each of the coils of the second coil group and the first three-phase current is changed. By changing the connection state with the second inverter that generates a three-phase current having a phase difference, the phase difference of the current supplied to the coil of the first coil group and the corresponding coil of the second coil group Can be changed to generate magnetic fields of a plurality of wavelengths.

  A magnetic field generation method according to a second aspect of the present invention includes a first inverter that generates a first three-phase current, a phase difference with respect to the first three-phase current, the first three-phase current and the first three-phase current A second inverter for generating a second three-phase current having a phase difference for generating a phase current between the negative phase of the first three-phase current and an inverse of the first three-phase current A third inverter that generates a third three-phase current that is a phase, a fourth inverter that generates a fourth three-phase current that is opposite to the second three-phase current, and an even number of 3 A plurality of coils adjacent to each other, and a first coil group arranged such that the direction of the magnetic field passing through the center of the coil faces the direction intersecting the coil arrangement direction, and the coils of the first coil group Corresponding to each of the number of coils corresponding to each of the even number multiples of 3 in the phase difference at the generated magnetic field wavelength. And a second coil group arranged so that the direction of the magnetic field passing through the center of the coil faces the direction intersecting with the coil arrangement direction. The method of generating a magnetic field in which each of the coils of the first coil group is connected to the first inverter and the third inverter, and each of the coils of the second coil group is connected to the second coil. The connection state between the inverter and the fourth inverter is changed to generate a plurality of combined magnetic fields having different wavelengths.

  According to the magnetic field generation method according to the second invention, the first inverter is connected to the coil of the first coil group in accordance with the phase of the current supplied to each of the coils of the first coil group, and the first The first three-phase current is supplied, the third inverter is connected to the coil of the first coil group, and the third three-phase current that is opposite in phase to the first three-phase current is supplied to the coil. . Similarly, according to the phase of the current supplied to each of the coils of the second coil group, the second inverter is connected to the coil of the second coil group to supply the second three-phase current. The fourth inverter is connected to the coils of the second coil group to supply a fourth three-phase current having a phase opposite to that of the second three-phase current.

  At this time, each of the coils of the first coil group and each of the corresponding coils of the second coil group are coils by an amount corresponding to the phase difference between the first three-phase current and the second three-phase current. A magnetic field corresponding to the first three-phase current and the third three-phase current is generated from the first coil group, and the second three-phase current and the second three-phase current are generated from the second coil group. 4 generates a magnetic field according to the three-phase current. Then, the magnetic field from the first coil group and the magnetic field from the second coil group are combined, the magnetic field having a predetermined wavelength is increased, and a combined magnetic field having a predetermined wavelength is generated.

  In addition, the connection state between each of the coils of the first coil group and the first inverter and the third inverter is changed, and each of the coils of the second coil group, the second inverter, and the fourth inverter The connection state is changed, and the phase difference between the currents supplied to the coils of the first coil group and the corresponding second coil group is changed. Then, the magnetic field from the first coil group and the magnetic field from the second coil group are combined, the magnetic field having a wavelength different from the above is increased, and a combined magnetic field having a wavelength different from the above is generated.

  Similarly, the connection state between each of the coils of the first coil group and the first inverter and the third inverter is further changed to each of the coils of the second coil group, the second inverter, and the fourth inverter. The phase difference of the current supplied to the coil of the first coil group and the corresponding coil of the second coil group is further changed to generate a plurality of combined magnetic fields having different wavelengths. Let

  Therefore, the connection state between each of the coils of the first coil group and the first inverter that generates the first three-phase current and the third inverter that generates the reverse phase of the first three-phase current is changed, A connection state between each of the coils of the second coil group and a second inverter that generates a three-phase current having a phase difference with respect to the first three-phase current, and a fourth inverter that generates a reverse phase of the three-phase current Is changed, the phase difference of the current supplied to the coil of the first coil group and the corresponding coil of the second coil group can be changed to generate magnetic fields of a plurality of wavelengths.

  According to a third aspect of the present invention, there is provided a magnetic field generation method comprising: a first inverter that generates a first three-phase current and a third three-phase current having a phase opposite to the first three-phase current; A second phase difference for generating a current of a phase between the first three-phase current and a phase opposite to the first three-phase current. A second inverter that generates a three-phase current and a fourth three-phase current that is opposite in phase to the second three-phase current; and an even number multiple of three connected to the first inverter. A first coil group arranged adjacent to each other so that the direction of the magnetic field passing through the center of the first coil faces the direction intersecting the coil arrangement direction, and the second inverter. And each of an even multiple of 3 corresponding to each of the coils of the first coil group is generated. A second coil that is arranged so that the direction of the magnetic field passing through the center of the coil faces the direction intersecting with the coil arrangement direction while being shifted in the coil arrangement direction by an amount corresponding to the phase difference at the magnetic field wavelength to be applied A magnetic field generating method of a magnetic field generating device including a group, wherein a combination of currents supplied to each of the coils of the first coil group is changed by the first inverter, and the second inverter A combination of currents supplied to each of the coils of the second coil group is changed to generate a plurality of combined magnetic fields having different wavelengths.

  According to the third magnetic field generation method, the first three-phase current and the first three-phase current in the coils of the first coil group to which the first inverter is connected are reversed in phase with respect to the third three-phase current. Supply three-phase current to the coil. Similarly, each of the coils of the second coil group to which the second inverter is connected has a fourth three-phase current that is opposite in phase to the second three-phase current and the second three-phase current. Supply.

  At this time, each of the coils of the first coil group and each of the corresponding coils of the second coil group are coils by an amount corresponding to the phase difference between the first three-phase current and the second three-phase current. A magnetic field corresponding to the first three-phase current and the third three-phase current is generated from the first coil group, and the second three-phase current and the second three-phase current are generated from the second coil group. 4 generates a magnetic field according to the three-phase current. Then, the magnetic field from the first coil group and the magnetic field from the second coil group are combined, the magnetic field having a predetermined wavelength is increased, and a combined magnetic field having a predetermined wavelength is generated.

  In addition, the combination of the first three-phase current and the third three-phase current supplied by the first inverter to each of the coils of the first coil group is changed, and each of the coils of the second coil group is changed. On the other hand, the combination of the second three-phase current and the fourth three-phase current supplied by the second inverter is changed and supplied to the coil of the first coil group and the corresponding coil of the second coil group. Change the phase difference of the current. Then, the magnetic field from the first coil group and the magnetic field from the second coil group are combined, the magnetic field having a wavelength different from the above is increased, and a combined magnetic field having a wavelength different from the above is generated.

  Similarly, the combination of the first three-phase current and the third three-phase current supplied by the first inverter to each of the coils of the first coil group is further changed, and the coils of the second coil group are changed. The combination of the second three-phase current and the fourth three-phase current supplied by the second inverter to each is further changed, and the coil of the second coil group corresponding to the coil of the first coil group; The phase difference of the current supplied to is further changed to generate a plurality of synthesized magnetic fields having different wavelengths.

  Therefore, the combination of the first three-phase current supplied by the first inverter and the reverse current of the first three-phase current to each of the coils of the first coil group is changed, and the second coil group By changing the combination of the three-phase current having a phase difference with respect to the first three-phase current supplied by the second inverter to each of the coils and the current in the opposite phase of the three-phase current, the first coil group The phase difference of the current supplied to the second coil group and the corresponding coil of the second coil group can be changed to generate magnetic fields of a plurality of wavelengths.

  In addition, the second inverter can change the phase difference of the second three-phase current, and generates a plurality of combined magnetic fields having different wavelengths by changing the phase difference of the second three-phase current. Can be made. Thereby, magnetic fields of a plurality of wavelengths can be further generated by changing the phase difference.

  The plurality of synthesized magnetic fields may include a synthesized magnetic field having a fundamental wavelength and a synthesized magnetic field having a wavelength that is 1 / integer of the fundamental wavelength.

  Further, the phase difference can be set to an integral multiple of 30 ° according to the generated magnetic field wavelength.

  As described above, according to the magnetic field generation method of the present invention, the connection state between each of the coils of the first coil group and each of the coils of the second coil group and the inverter is changed, or the first By changing the combination of currents supplied to each of the coils of the coil group and each of the coils of the second coil group, the coil is supplied to the coil of the first coil group and the corresponding coil of the second coil group. An effect is obtained that a magnetic field having a plurality of wavelengths can be generated by changing the phase difference of the current.

  Hereinafter, a first embodiment of the present invention will be described in detail with reference to the drawings.

  As shown in FIG. 1, the electromagnetic excitation system 10 according to the first embodiment includes a magnetic field generator 12 and a superconducting coil unit 14.

  The magnetic field generator 12 includes a surface layer coil group 16 configured by arranging six excitation coils 16A to 16F, a back layer coil group 18 configured by arranging six excitation coils 18A to 18F, A surface layer inverter 20 that supplies a predetermined alternating current to each of the excitation coils 16A to 16F of the surface coil group 16, and a back that supplies a predetermined alternating current to each of the excitation coils 18A to 18F of the back layer coil group 18. A layer inverter 22 is provided, and the surface layer coil group 16 and the back layer coil group 18 are concentrated winding coils.

  In the surface coil group 16, the exciting coils 16A to 16F are adjacent to each other, and are arranged two-dimensionally so that the direction of the magnetic field passing through the centers of the exciting coils 16A to 16F faces the direction orthogonal to the coil arrangement direction. Moreover, in the back layer coil group 18, the excitation coils 18A to 18F are provided so as to correspond to the excitation coils 16A to 16F, respectively, and the excitation coils 18A to 18F are adjacent to each other to correspond to the excitation coils. 16A-16F is shifted in the coil arrangement direction by τ / 6 (τ is ½ of the fundamental wavelength of the generated magnetic field), and the direction of the magnetic field passing through the center of the excitation coils 18A-18F is the coil They are arranged in a two-dimensional manner so as to face the direction orthogonal to the arrangement direction.

  The surface layer inverter 20 generates a three-phase (symmetric 120 °) alternating current of U phase, V phase, and W phase, and vibrates any alternating current of U phase, V phase, and W phase. It supplies to each of the coils 16A-16F.

  Further, the back layer inverter 22 has three phases of R phase, S phase, and T phase (symmetric 120 °) having a phase difference of an integral multiple of 30 ° with respect to the three-phase alternating current generated by the surface layer inverter 20. ), And any one of the R-phase, S-phase, and T-phase AC currents is supplied to each of the excitation coils 18A to 18F. For example, a phase synchronization circuit (PLL circuit) for controlling the phase difference between the system 50 Hz voltage and the inverter output current to be constant is incorporated in the inverter 22 for the surface, and the inverter 20 for the surface layer is used by using the phase synchronization circuit. And the back layer inverter 22 are controlled in absolute phase difference.

  Each of the excitation coils 16A to 16F and 18A to 18F is bipolarly connected to either one of the surface layer inverter 20 and the back layer inverter 22 at the positive electrode and the negative electrode.

  The superconducting coil section 14 is configured by arranging two superconducting coils 14A and 14B.

  Next, the operation in the first embodiment will be described.

  First, a case where a moving magnetic field having a fundamental wave (having a wavelength of 2τ) is generated will be described with reference to FIG. The U-phase current output terminal of the surface layer inverter 20 and the positive terminal of the excitation coil 16A of the surface layer coil group 16 are connected, and the negative terminal of the excitation coil 16A and the negative terminal of the excitation coil 16D are connected.

  Further, the W-phase current output terminal of the surface layer inverter 20 and the negative terminal of the excitation coil 16B are connected, and the positive terminal of the excitation coil 16B and the positive terminal of the excitation coil 16E are connected. Further, the V-phase current output terminal of the surface layer inverter 20 and the positive terminal of the excitation coil 16C are connected, and the negative terminal of the excitation coil 16C and the negative terminal of the excitation coil 16F are connected.

  Then, the positive terminal of the exciting coil 16D that is the terminal of the U-phase current, the negative terminal of the exciting coil 16E that is the terminal of the W-phase current, and the positive terminal of the exciting coil 16F that is the terminal of the V-phase current. Connect the wires so that they are collected as one neutral point.

  Further, the R-phase current output terminal of the back layer inverter 22 and the positive terminal of the excitation coil 18A of the back layer coil group 18 are connected, and the negative terminal of the excitation coil 18A and the negative terminal of the excitation coil 18D are connected. To do.

  Further, the T-phase current output terminal of the back layer inverter 22 and the negative terminal of the excitation coil 18B are connected, and the positive terminal of the excitation coil 18B and the positive terminal of the excitation coil 18E are connected. Further, the S-phase current output terminal of the back layer inverter 22 and the positive terminal of the excitation coil 18C are connected, and the negative terminal of the excitation coil 18C and the negative terminal of the excitation coil 18F are connected.

  Then, the positive terminal of the exciting coil 18D that is the terminal of the R phase current, the negative terminal of the exciting coil 18E that is the terminal of the T phase current, and the positive terminal of the exciting coil 18F that is the terminal of the S phase current. Connect the wires so that they are collected as one neutral point.

  Then, as shown in FIG. 3A, the U-phase current is an AC current having a phase of 0 °, the V-phase current is an AC current having a phase of 120 °, and the W-phase current is a phase of 240 °. AC current. Further, in the back layer inverter 22, the phase difference with respect to the three-phase current generated by the surface layer inverter 20 is set to 30 °, and the R phase current is 30 ° phase shifted from the U phase current by 30 °. An AC current having a phase of 150 ° with a phase shift of 30 ° from the phase V current and an AC current having a phase of 270 ° with a phase shift of 30 ° from the phase W current; To do.

  Supply the three-phase currents of the U phase, V phase, and W phase and the three-phase currents of R phase, S phase, and T phase shifted by 30 ° to the excitation coils 16A to 16F and 18A to 18F. The excitation coil 16B is supplied with a W-phase current from a negative terminal, the excitation coil 16D is supplied with a U-phase current from a reverse-phase terminal, and the excitation coil 16F has a V-phase current. Is supplied from the negative electrode terminal, currents in opposite phases of the W phase, the U phase, and the V phase are supplied to the excitation coils 16B, 16D, and 16F.

  The excitation coil 18B is supplied with a T-phase current from a negative terminal, the excitation coil 18D is supplied with an R-phase current from a reverse-phase terminal, and the excitation coil 18F is supplied with an S-phase current. Current is supplied from the negative terminal, currents in opposite phases of the T phase, R phase, and S phase are supplied to the excitation coils 18B, 18D, and 18F.

  Therefore, as shown in FIG. 4, in each of the exciting coils 16A to 16F of the surface layer coil group 16, the phase becomes 0 °, 60 °, 120 °, 180 °, 240 °, 300 °, and the back layer coil group 18 In each of the exciting coils 18A to 18F, the phases are 30 °, 90 °, 150 °, 210 °, 270 °, and 330 °. Here, since the arrangement of the back layer coil group 18 is advanced by an amount (τ / 6) corresponding to 30 ° in the traveling direction with respect to the surface layer coil group 16, and simultaneously the phase of the supply current is advanced 30 °, In the back layer, the fundamental waves are overlapped and increased in phase, and a fundamental magnetic field as shown in FIG. 12A is generated.

  Next, a case where a moving magnetic field (spatial secondary magnetic field) having a wavelength half that of the fundamental wave is generated will be described with reference to FIG.

  First, the U-phase current output terminal of the surface layer inverter 20 and the positive terminal of the excitation coil 16A of the surface layer coil group 16 are connected, and the negative terminal of the excitation coil 16A and the positive terminal of the excitation coil 16D are connected.

  Further, the V-phase current output terminal of the surface layer inverter 20 and the positive terminal of the excitation coil 16B are connected, and the negative terminal of the excitation coil 16B and the positive terminal of the excitation coil 16E are connected. Further, the W-phase current output terminal of the surface layer inverter 20 and the positive terminal of the excitation coil 16C are connected, and the negative terminal of the excitation coil 16C and the positive terminal of the excitation coil 16F are connected.

  The negative terminal of the exciting coil 16D that is the terminal of the U-phase current, the negative terminal of the exciting coil 16E that is the terminal of the V-phase current, and the positive terminal of the exciting coil 16F that is the terminal of the W-phase current. Connect the wires so that they are collected as one neutral point.

  Further, the R-phase current output terminal of the back layer inverter 22 and the positive terminal of the excitation coil 18A of the back layer coil group 18 are connected, and the negative terminal of the excitation coil 18A and the positive terminal of the excitation coil 18D are connected. To do.

  Further, the S-phase current output terminal of the back layer inverter 22 and the positive terminal of the excitation coil 18B are connected, the negative terminal of the excitation coil 18B and the positive terminal of the excitation coil 18E are connected, and the back layer inverter is connected. The T-phase current output terminal 22 and the positive terminal of the excitation coil 18C are connected, and the negative terminal of the excitation coil 18C and the positive terminal of the excitation coil 18F are connected.

  The negative terminal of the exciting coil 18D that is the terminal of the R-phase current, the negative terminal of the exciting coil 18E that is the terminal of the S-phase current, and the negative terminal of the exciting coil 18F that is the terminal of the T-phase current. Connect the wires so that they are collected as one neutral point.

  Then, as shown in FIG. 3B, the U-phase current is an AC current having a phase of 0 °, the V-phase current is a phase of 120 °, and the W-phase current is a phase of 240 °. Further, in the back layer inverter 22, the phase difference with respect to the three-phase current generated by the surface layer inverter 20 is changed to 60 °, and the R phase current is 60 ° phase shifted from the U phase current by 60 °. An AC current having a phase of 180 ° with a phase shift of 60 ° from the V-phase current, and an AC current having a phase of 300 ° with a phase shift of 60 ° from the W-phase current. To do. These R-phase current, S-phase current, and T-phase current are supplied from the surface layer inverter 20 as W-phase reverse-phase current, U-phase reverse-phase current, and V-phase reverse-phase current, respectively. Also good.

  The three-phase currents of the U-phase, V-phase, and W-phase and the three-phase currents of R-phase, S-phase, and T-phase shifted by 60 ° are supplied to the excitation coils 16A to 16F and 18A to 18F, respectively. As shown in FIG. 4, the phase is 0 °, 120 °, 240 °, 0 °, 120 °, and 240 ° in each of the excitation coils 16A to 16F of the surface layer coil group 16. Further, in each of the excitation coils 18A to 18F of the back layer coil group 18, the phases are 60 °, 180 °, 300 °, 60 °, 180 °, and 300 °. Here, the arrangement of the back layer coil group 18 is advanced by an amount (τ / 6) corresponding to 60 ° of ½ wavelength in the traveling direction with respect to the surface layer coil group 16, and simultaneously the phase of the supply current is advanced by 60 °. Therefore, the ½ wavelength wave is overlapped and increased in the same phase on the surface layer and the back layer, and a magnetic field having a ½ wavelength of the fundamental wave as shown in FIG. 12B is generated.

  Next, a case where a moving magnetic field (spatial tertiary magnetic field) having a wavelength of 1/3 of the fundamental wave is generated will be described with reference to FIG. The U-phase current output terminal of the surface layer inverter 20 and the positive terminal of the excitation coil 16A of the surface layer coil group 16 are connected, and the negative terminal of the excitation coil 16A and the negative terminal of the excitation coil 16B are connected. The positive terminal of the coil 16B and the positive terminal of the excitation coil 16C are connected, the negative terminal of the excitation coil 16C and the negative terminal of the excitation coil 16D are connected, and the positive terminal of the excitation coil 16D and the excitation coil 16E are connected. And the negative electrode terminal of the excitation coil 16E and the negative electrode terminal of the excitation coil 16F are connected.

  Then, the positive terminal of the excitation coil 16F, which is the end of the U-phase current, and the V-phase current output terminal are connected.

  Further, the R-phase current output terminal of the back layer inverter 22 and the positive terminal of the excitation coil 18A of the back layer coil group 18 are connected, and the negative terminal of the excitation coil 18A and the negative terminal of the excitation coil 18B are connected. Then, the positive terminal of the excitation coil 18B and the negative terminal of the excitation coil 18C are connected, the positive terminal of the excitation coil 18C and the positive terminal of the excitation coil 18C are connected, and the negative terminal of the excitation coil 18C The negative terminal of the excitation coil 18D is connected, the positive terminal of the excitation coil 18D and the positive terminal of the excitation coil 18E are connected, and the negative terminal of the excitation coil 18E and the negative terminal of the excitation coil 18F are connected. To do.

  Then, the positive terminal of the exciting coil 18F, which is the terminal of the R-phase current, and the S-phase current output terminal are connected.

  Then, as shown in FIG. 3C, the U-phase current is an AC current having a phase of 0 °, and the phase difference with respect to the three-phase current generated by the surface layer inverter 20 is 90 ° in the back layer inverter 22. The R-phase current is changed to an alternating current having a phase of 90 ° with a phase shift of 90 ° from the U-phase current.

  The U-phase current and the R-phase current with a 90 ° phase shift are supplied to the exciting coils 16A to 16F and 18A to 18F, and the U-phase current is supplied to the exciting coil 16B from the negative electrode terminal. Since the U-phase current is supplied to the excitation coil 16D from the negative phase terminal and the U-phase current is supplied to the excitation coil 16F from the negative terminal, the excitation coils 16B, 16D, and 16F are supplied to the excitation coil 16D. Is supplied with a current in the opposite phase of the U phase.

  The excitation coil 18B is supplied with an R-phase current from a negative terminal, the excitation coil 18D is supplied with an R-phase current from a reverse-phase terminal, and the excitation coil 18F is supplied with an R-phase current. Current is supplied from the negative terminal, so that the reverse-phase current of the R-phase is supplied to the excitation coils 18B, 18D, and 18F.

  Therefore, as shown in FIG. 4, in each of the exciting coils 16A to 16F of the surface coil group 16, the phases are 0 °, 180 °, 0 °, 180 °, 0 °, and 180 °. Further, in each of the exciting coils 18A to 18F of the back layer coil group 18, the phases are 90 °, 270 °, 90 °, 270 °, 90 °, and 270 °. Here, the arrangement of the back layer coil group 18 is advanced by an amount (τ / 6) corresponding to 90 ° of the 1/3 wavelength in the traveling direction with respect to the surface coil group 16, and the phase of the supply current is advanced 90 ° at the same time. Therefore, the wave of 1/3 wavelength is superposed and increased in the same phase on the surface layer and the back layer, and a magnetic field of 1/3 wavelength of the fundamental wave as shown in FIG. 12C is generated.

  Next, a case of generating a ¼ wavelength moving magnetic field (spatial quaternary magnetic field) of the fundamental wave will be described with reference to FIG. In the connection method in the case of generating a half-wave magnetic field of the fundamental wave, the V-phase current output terminal and the W-phase current output terminal are interchanged, and the S-phase current output terminal and the T-phase current output terminal are interchanged. Correspondingly, the U-phase current output terminal of the surface layer inverter 20 and the positive terminal of the excitation coil 16A are connected, the negative terminal of the excitation coil 16A and the positive terminal of the excitation coil 16D are connected, and the W-phase current output The terminal and the positive terminal of the excitation coil 16B are connected, and the negative terminal of the excitation coil 16B and the positive terminal of the excitation coil 16E are connected.

  Further, the V-phase current output terminal of the surface layer inverter 20 and the positive terminal of the excitation coil 16C are connected, and the negative terminal of the excitation coil 16C and the positive terminal of the excitation coil 16F are connected.

  The negative terminal of the exciting coil 16D that is the terminal of the U-phase current, the negative terminal of the exciting coil 16E that is the terminal of the W-phase current, and the positive terminal of the exciting coil 16F that is the terminal of the V-phase current. Connect the wires so that they are collected as one neutral point.

  Further, the R-phase current output terminal of the back layer inverter 22 and the positive terminal of the excitation coil 18A of the back layer coil group 18 are connected, and the negative terminal of the excitation coil 18A and the positive terminal of the excitation coil 18D are connected. Then, the T-phase current output terminal of the back layer inverter 22 and the positive terminal of the excitation coil 18B are connected, and the negative terminal of the excitation coil 18B and the positive terminal of the excitation coil 18E are connected.

  Further, the S-phase current output terminal of the back layer inverter 22 and the positive terminal of the excitation coil 18C are connected, and the negative terminal of the excitation coil 18C and the positive terminal of the excitation coil 18F are connected.

  Then, the negative terminal of the exciting coil 18D that is the terminal of the R phase current, the negative terminal of the exciting coil 18E that is the terminal of the T phase current, and the negative terminal of the exciting coil 18F that is the terminal of the S phase current. Connect the wires so that they are collected as one neutral point.

  As shown in FIG. 3D, the U-phase current is an AC current having a phase of 0 °, the V-phase current is a phase of 120 °, and the W-phase current is a phase of 240 °. Further, in the back layer inverter 22, the phase difference with respect to the three-phase current generated by the surface layer inverter 20 is changed to 120 °, and the R phase current is 120 ° phase shifted from the U phase current by 120 °. An AC current having a phase of 240 ° that is 120 ° out of phase with the V phase current, and an AC current having a phase of 0 ° that is 120 ° out of phase with the W phase current. To do.

  In addition, you may make it supply V phase current, W phase current, and U phase current from the inverter 20 for surface layers as these R phase current, S phase current, and T phase current, respectively.

  The three-phase currents of the U-phase, V-phase, and W-phase and the three-phase currents of R-phase, S-phase, and T-phase shifted by 120 ° are supplied to the excitation coils 16A to 16F and 18A to 18F, respectively. As shown in FIG. 4, the phase is 0 °, 240 °, 120 °, 0 °, 240 °, and 120 ° in each of the exciting coils 16A to 16F of the surface layer coil group 16. In each of the excitation coils 18A to 18F of the back layer coil group 18, the phases are 120 °, 0 °, 240 °, 120 °, 0 °, and 240 °. Here, the arrangement of the back layer coil group 18 is advanced by an amount (τ / 6) corresponding to 120 ° of a quarter wavelength in the traveling direction with respect to the surface layer coil group 16, and simultaneously the phase of the supply current is advanced 120 °. Therefore, a wave having a quarter wavelength of the surface layer and the back layer is overlapped and increased in phase, and a magnetic field having a quarter wavelength of the fundamental wave as shown in FIG. 12D is generated.

  Next, a case where a moving magnetic field (spatial fifth-order magnetic field) having a wavelength of 1/5 of the fundamental wave is generated will be described with reference to FIG. This corresponds to the case where the V-phase current output terminal and the W-phase current output terminal are interchanged and the S-phase current output terminal and the T-phase current output terminal are interchanged in the connection method for generating the fundamental magnetic field. The U-phase current output terminal of the inverter 20 and the positive terminal of the excitation coil 16A of the surface coil group 16 are connected, the negative terminal of the excitation coil 16A and the negative terminal of the excitation coil 16D are connected, and a V-phase current output is obtained. The terminal and the negative terminal of the exciting coil 16B are connected, the positive terminal of the exciting coil 16B and the positive terminal of the exciting coil 16E are connected, and the W-phase current output terminal and the positive terminal of the exciting coil 16C are connected. Then, the negative electrode terminal of the excitation coil 16C and the negative electrode terminal of the excitation coil 16F are connected. The positive electrode terminal of the excitation coil 16D, the negative electrode terminal of the excitation coil 16E, and the positive electrode terminal of the excitation coil 16F are connected so as to be integrated into one point as a neutral point.

  Further, the R-phase current output terminal of the back layer inverter 22 and the positive terminal of the excitation coil 18A are connected, the negative terminal of the excitation coil 18A and the negative terminal of the excitation coil 18D are connected, and an S-phase current output is made. The terminal and the negative terminal of the excitation coil 18B are connected, the positive terminal of the excitation coil 18B and the positive terminal of the excitation coil 18E are connected, and the T-phase current output terminal and the positive terminal of the excitation coil 18C are connected. Then, the negative electrode terminal of the excitation coil 18C and the negative electrode terminal of the excitation coil 18F are connected. Further, the positive electrode terminal of the excitation coil 18D, the negative electrode terminal of the excitation coil 18E, and the positive electrode terminal of the excitation coil 18F are connected so as to be integrated into one point as a neutral point.

  Then, as shown in FIG. 3D, the U-phase current is an alternating current having a phase of 0 °, the V-phase current is an alternating current having a phase of 120 °, and the W-phase current is a phase of 240 °. AC current. Further, in the back layer inverter 22, the phase difference with respect to the three-phase current generated by the surface layer inverter 20 is changed to 150 °, and the R phase current is 150 ° phase shifted from the U phase current by 150 °. And an AC current having a phase of 270 ° shifted by 150 ° from the V phase current, an AC current having a phase of 30 ° shifted by 150 ° from the W phase current, To do.

  Supply the three-phase currents of the U-phase, V-phase, and W-phase, and the three-phase currents of R-phase, S-phase, and T-phase shifted by 150 ° to the excitation coils 16A to 16F and 18A to 18F, The excitation coil 16B is supplied with a V-phase current from a negative terminal, the excitation coil 16D is supplied with a U-phase current from a reverse-phase terminal, and the excitation coil 16F has a W-phase current. Is supplied from the negative electrode terminal, currents in opposite phases of the V-phase, U-phase, and W-phase are supplied to the excitation coils 16B, 16D, and 16F.

  The excitation coil 18B is supplied with S-phase current from the negative terminal, the excitation coil 18D is supplied with R-phase current from the reverse-phase terminal, and the excitation coil 18F is supplied with T-phase current. Current is supplied from the negative terminal, so that currents in the opposite phases of the S phase, the R phase, and the T phase are supplied to the excitation coils 18B, 18D, and 18F.

  Therefore, as shown in FIG. 4, in each of the exciting coils 16A to 16F of the surface layer coil group 16, the phases are 0 °, 300 °, 240 °, 180 °, 120 °, and 60 °. Moreover, in each of the exciting coils 18A to 18F of the back layer coil group 18, the phases are 150 °, 90 °, 30 °, 330 °, 270 °, and 210 °. Here, the arrangement of the back layer coil group 18 is advanced by an amount corresponding to 150 ° of the 1/5 wavelength in the traveling direction with respect to the surface layer coil group 16, and the phase of the supply current is simultaneously advanced by 150 °. In the back layer, waves of 1/5 wavelength are overlapped and increased in phase, and a magnetic field having a wavelength of 1/5 of the fundamental wave as shown in FIG. 12E is generated.

  Next, a case where an alternating magnetic field (spatial sixth magnetic field) having a wavelength of 1/6 of the fundamental wave is generated will be described with reference to FIG. The U-phase current output terminal of the surface layer inverter 20 and the positive terminal of the excitation coil 16A of the surface layer coil group 16 are connected, and the negative terminal of the excitation coil 16A and the positive terminal of the excitation coil 16B are connected. The negative terminal of the coil 16B and the positive terminal of the excitation coil 16C are connected, the negative terminal of the excitation coil 16C and the positive terminal of the excitation coil 16D are connected, and the negative terminal of the excitation coil 16D and the excitation coil 16E are connected. Are connected to each other, and the negative electrode terminal of the excitation coil 16E is connected to the positive electrode terminal of the excitation coil 16F.

  Then, the negative terminal of the excitation coil 16F, which is the end of the U-phase current, is connected to the V-phase current output terminal.

  Further, the R-phase current output terminal of the back layer inverter 22 and the positive terminal of the excitation coil 18A of the back layer coil group 18 are connected, and the negative terminal of the excitation coil 18A and the positive terminal of the excitation coil 18B are connected. Then, the negative terminal of the excitation coil 18B and the positive terminal of the excitation coil 18C are connected, the negative terminal of the excitation coil 18C and the positive terminal of the excitation coil 18C are connected, and the negative terminal of the excitation coil 18C The positive terminal of the exciting coil 18D is connected, the negative terminal of the exciting coil 18D and the positive terminal of the exciting coil 18E are connected, and the negative terminal of the exciting coil 18E and the positive terminal of the exciting coil 18F are connected. To do.

  Then, the negative terminal of the exciting coil 18F, which is the terminal of the R phase current, and the S phase current output terminal are connected.

  Then, as shown in FIG. 3F, the U-phase current is an AC current having a phase of 0 °, and the back layer inverter 22 has a phase difference of 180 with respect to the three-phase current generated by the surface layer inverter 20. And the R-phase current is changed to an alternating current having a phase of 180 ° shifted from the U-phase current by 180 °. The R-phase current may be supplied from the surface layer inverter 20 as a U-phase reverse-phase current.

  The U-phase current and the R-phase current whose phase is shifted by 180 ° are supplied to the excitation coils 16A to 16F and 18A to 18F, respectively, and as shown in FIG. 4, each of the excitation coils 16A to 16F of the surface coil group 16 Then, the phase is 0 °. Moreover, in each of the exciting coils 18A to 18F of the back layer coil group 18, the phase is 180 °. Here, the arrangement of the back layer coil group 18 is advanced by an amount corresponding to 180 ° of the 1/6 wavelength in the traveling direction with respect to the surface coil group 16, and the phase of the supply current is simultaneously advanced by 180 °. In the back layer, waves of 1/6 wavelength are overlapped and increased in phase, and a magnetic field of 1/6 wavelength of the fundamental wave is generated.

  In this way, the connection state between the excitation coils 16A to 16F and 18A to 18F and the surface layer inverter 20 and the back layer inverter 22 is changed, and the U phase, V phase, W phase, R phase, S phase, and Supply alternating current of T phase and change the phase difference between three phases of U phase, V phase and W phase and three phases of R phase, S phase and T phase to have different spatial harmonics A magnetic field is generated, and the superconducting coils 14A and 14B of the superconducting coil unit 14 are electromagnetically excited.

  As described above, according to the electromagnetic excitation system according to the first embodiment, each of the coils in the surface coil group and the inverter for the surface layer that generates the three-phase currents of the U phase, the V phase, and the W phase. For the back layer that changes the connection state and generates R-phase, S-phase, and T-phase three-phase currents that have a phase difference with respect to the three-phase currents of the U-phase, V-phase, and W-phase with each of the coils By changing the connection state with the inverter, the phase difference of the current supplied to the coil of the surface layer coil group and the coil of the corresponding back layer coil group can be changed to generate a plurality of magnetic fields having different wavelengths. it can.

  Further, in the back layer inverter, a plurality of magnetic fields having different wavelengths can be further generated by changing the phase difference with respect to the three-phase currents of the U phase, the V phase, and the W phase.

  Further, a moving magnetic field and an alternating magnetic field having a plurality of wavelengths can be generated from one type of concentrated winding coil composed of a surface layer coil group and a back layer coil group.

  In addition, when the magnetic field generator according to the present embodiment is applied to a magnetically supported electromagnetic vibration device in a superconducting magnet of a superconducting magnetic levitation railway, if an inverter capable of outputting a composite current of a plurality of phases is used, Main harmonic magnetic field (spatial fifth magnetic field), main harmonic magnetic field (spatial secondary magnetic field) of 120-degree pitch ground coil, harmonic magnetic field generated by ground coil current harmonics (spatial tertiary magnetic field, etc.), and fundamental wave A magnetic field can be generated at the same time, and combined electromagnetic excitation simulating actual levitation can be achieved.

  When the magnetic field generator according to this embodiment is applied to an armature, the pole pitch and the number of poles can be changed only by setting the supply current or changing the connection.

  In the above embodiment, an example has been described in which one inverter is provided for each of the surface coil group and the back coil group including six excitation coils. However, the present invention is not limited to this. Instead, as shown in FIG. 10, the coil group may be configured by three excitation coils, and one inverter may supply a three-phase current to the three excitation coils. Further, a plurality of superconducting coil sections may be arranged, and a plurality of coil groups each including three excitation coils may be arranged. In this case, each of the four inverters supplies a three-phase current to every other coil group. The connection should be as follows.

  In addition, the case where the connection is changed in order to generate the magnetic field of each wavelength has been described as an example, but the case where the fundamental wave magnetic field is generated and the case where the magnetic field of 1/5 wavelength is generated are the same. In addition, the phase order may be changed in the surface layer inverter and the back layer inverter, and the phase difference between the surface layer inverter and the back layer inverter may be changed. Note that the phase order can be changed by reversing the surface layer inverter and the back layer inverter. In addition, in the case of generating a ½ wavelength magnetic field and the case of generating a ¼ wavelength magnetic field, it can be realized by switching the phase order with the same connection.

  Next, a second embodiment will be described. In addition, about the part which has the same structure as 1st Embodiment, the same code | symbol is attached | subjected and description is abbreviate | omitted.

  The second embodiment is different from the first embodiment in that an inverter that generates a three-phase current and an inverter that generates a current having a phase opposite to that of the three-phase current are separately provided.

  As shown in FIG. 11, the magnetic field generator 112 according to the second embodiment includes a surface layer inverter 20 that generates a three-phase AC current of U phase, V phase, and W phase, and U phase, V phase. , And the W-phase reverse phase -U phase, -V phase, and -W phase three-phase AC current generated by the surface layer negative-phase inverter 120 and the surface layer inverter 20 A back layer inverter 22 that generates a three-phase alternating current of R phase, S phase, and T phase having a phase difference with respect to R, -R phase that is a reverse phase of R phase, S phase, and T phase, A reverse phase inverter 122 for back layer that generates a three-phase alternating current of -S phase and -T phase.

  When a magnetic field having a fundamental wave is generated, the U-phase current output terminal of the surface layer inverter 20 and the positive terminal of the excitation coil 16A of the surface layer coil group 16 are connected, and the W-phase current output terminal and the excitation coil 16E are connected. The V-phase current output terminal and the positive electrode terminal of the exciting coil 16C are connected.

  The negative terminal of the exciting coil 16A that is the terminal of the U-phase current, the negative terminal of the exciting coil 16E that is the terminal of the W-phase current, and the negative terminal of the exciting coil 16C that is the terminal of the V-phase current. Connect the wires so that they are collected as one neutral point.

  Further, the -U phase current output terminal of the surface phase reverse phase inverter 120 and the positive terminal of the excitation coil 16D are connected, the -W phase current output terminal and the positive terminal of the excitation coil 16B are connected, and the -V phase The current output terminal and the positive terminal of the exciting coil 16F are connected.

  The negative terminal of the exciting coil 16D that is the terminal of the -U phase current, the negative terminal of the exciting coil 16B that is the terminal of the -W phase current, and the negative terminal of the exciting coil 16F that is the terminal of the -V phase current The terminals are connected so as to be integrated into one point as a neutral point.

  Further, the R-phase current output terminal of the back layer inverter 22 and the positive terminal of the excitation coil 18A of the back layer coil group 18 are connected, and the T-phase current output terminal and the positive terminal of the excitation coil 18E are connected. The S-phase current output terminal and the positive terminal of the exciting coil 18C are connected.

  Then, the negative terminal of the exciting coil 18A that is the terminal of the R phase current, the negative terminal of the exciting coil 18E that is the terminal of the T phase current, and the negative terminal of the exciting coil 18C that is the terminal of the S phase current. Connect the wires so that they are collected as one neutral point.

  Further, the -R phase current output terminal of the reverse phase inverter 122 for the back layer and the positive terminal of the excitation coil 18D are connected, the -T phase current output terminal and the positive terminal of the excitation coil 18B are connected, and -S The phase current output terminal and the positive terminal of the exciting coil 18F are connected.

  The negative terminal of the exciting coil 18D that is the terminal of the -R phase current, the negative terminal of the exciting coil 18B that is the terminal of the -T phase current, and the negative terminal of the exciting coil 18F that is the terminal of the -S phase current. The terminals are connected so as to be integrated into one point as a neutral point.

  The U-phase current is an AC current having a phase of 0 °, the V-phase current is an AC current having a phase of 120 °, the W-phase current is an AC current having a phase of 240 °, and the −U-phase current is 180 °. It is assumed that the AC current has a phase of °, the −V phase current is an AC current having a phase of 300 °, and the −W phase current is an AC current having a phase of 60 °. Further, in the back layer inverter 22, the phase difference with respect to the three-phase current generated by the surface layer inverter 20 is set to 30 °, and the R phase current is 30 ° phase shifted from the U phase current by 30 °. Current, the S phase current is an AC current having a phase of 150 ° shifted by 30 ° from the V phase current, and the T phase current is an AC current having a phase of 270 ° shifted by 30 ° from the W phase current. The −R phase current is an alternating current having a phase of 210 °, the −S phase current is an alternating current having a phase of 330 °, and the −T phase current is an alternating current having a phase of 90 °. When these currents are supplied to the excitation coils 16A to 16F and 18A to 18F as shown in FIG. 11, the phases of the excitation coils 16A to 16F of the surface coil group 16 are 0 °, 60 °, 120 °, 180 °, 240 °, and 300 °, and in each of the exciting coils 18A to 18F of the back layer coil group 18, the phases are 30 °, 90 °, 150 °, 210 °, 270 °, and 330 °. A wave magnetic field is generated.

  As for the 1/2 wavelength, 1/3 wavelength, 1/4 wavelength, 1/5 wavelength, and 1/6 wavelength, as described above, the surface layer inverter 20 and the surface layer reverse phase inverter 120 and the excitation coil 16A are also used. The connection state with each positive terminal of -16F is changed, and the connection state between the back layer inverter 22 and the reverse phase inverter 122 for back layer and the positive terminal of each of the excitation coils 18A-18F is changed. In the layer inverter 22, a magnetic field having each wavelength can be generated by changing the phase difference with respect to the three-phase current generated by the surface layer inverter 20.

  As described above, according to the electromagnetic excitation system according to the second embodiment, each of the coils in the surface coil group and the inverter for the surface layer that generates the U-phase, V-phase, and W-phase three-phase currents, and this Change the connection state with the reverse phase inverter for the surface layer that generates the negative phase -U phase, -V phase, -W phase three-phase current, and each of the coils of the back layer coil group, U phase, V phase, Inverter for back layer that generates three-phase currents of R-phase, S-phase, and T-phase having a phase difference with respect to the three-phase current of W-phase, and -R phase, -S phase, -T that are opposite phases of this three-phase current The phase difference between the currents supplied to the coil of the surface coil group and the corresponding coil of the back coil group is changed by changing the connection state with the reverse phase inverter for the back layer that generates the three-phase current of the phase. Thus, magnetic fields having a plurality of wavelengths can be generated.

  Further, in the back layer inverter, a plurality of magnetic fields having different wavelengths can be further generated by changing the phase difference with respect to the three-phase currents of the U phase, the V phase, and the W phase.

  Next, a third embodiment will be described. In addition, about the part which has the same structure as 1st Embodiment, the same code | symbol is attached | subjected and description is abbreviate | omitted.

  In the third embodiment, instead of changing the connection state, the connection state between the inverter and the excitation coil is fixed, and only the phase of the current supplied from the inverter is changed to generate a magnetic field of multiple wavelengths. This is different from the first embodiment.

  The magnetic field generator according to the third embodiment includes a surface layer inverter and a back layer inverter, and the surface layer inverter is provided with six current output terminals, and each of the current output terminals is a surface layer. The excitation coil 16A to 16F of the coil group 16 is connected to each positive terminal. The back layer inverter is also provided with six current output terminals in the same manner as the surface layer inverter, and each of the electronic output terminals is connected to the positive terminal of each of the excitation coils 18A to 18F of the back layer coil group 18. Has been.

  The surface layer inverter is capable of generating a U-phase, V-phase, and W-phase three-phase current, and a three-phase current of -U phase, -V phase, and -W phase, which are opposite phases of the three phases, AC current having any phase of 0 °, 120 °, 240 °, 60 °, 180 °, and 300 ° is supplied from the current output terminal of the inverter for the surface layer to each positive electrode terminal of the excitation coils 16A to 16F. It has become so.

  The back layer inverter can generate three-phase currents of R, S, and T phases, and three-phase currents of -R, -S, and -T, which are the opposite phases of these three phases. AC current of any one of 30 °, 150 °, 270 °, 90 °, 210 °, and 330 ° is supplied from the current output terminal of the back layer inverter to each positive electrode of each of the excitation coils 18A to 18F. It is designed to be supplied to the terminal.

  In the case of generating a magnetic field having any one of the fundamental wave, 1/2 wavelength, 1/3 wavelength, 1/4 wavelength, 1/5 wavelength, and 1/6 wavelength, the phase current shown in FIG. Is supplied to each of the exciting coils 16A to 16F and 18A to 18F, the phase order of the current supplied by the inverter for the surface layer is changed, and the phase order of the current supplied by the inverter for the back layer is changed to be three-phase A magnetic field having a plurality of wavelengths is generated by supplying three-phase currents having different phase differences with respect to the current and the three-phase current.

  As described above, according to the magnetic field generator according to the third embodiment, the U-phase, V-phase, and W-phase three-phase currents supplied by the surface layer inverter to each of the coils in the surface layer coil group, and Each of the coils in the back layer coil group is changed by changing the phase combination of the currents to be supplied by changing the phase order of the three-phase currents of -U phase, -V phase, and -W phase, which are opposite phases of the three-phase currents. R-phase, S-phase, and T-phase three-phase currents having a phase difference with respect to the three-phase currents of the U-phase, V-phase, and W-phase supplied by the back layer inverter, and the reverse phase of the three-phase currents- By switching the phase sequence of the three-phase currents of the R phase, -S phase, and -T phase, and changing the combination of the phases of the currents to be supplied, the coil of the surface layer coil group and the corresponding coil of the back layer coil group Changing the phase difference of the supplied current to generate magnetic fields of multiple wavelengths Can.

It is the schematic which shows the structure of the electromagnetic excitation system which concerns on the 1st Embodiment of this invention. It is a circuit diagram which shows the connection method when generating the magnetic field of a fundamental wave in the electromagnetic excitation apparatus which concerns on the 1st Embodiment of this invention. The phases of U phase, V phase, W phase, R phase, S phase, and T phase that are set when magnetic fields of different wavelengths are generated by the electromagnetic excitation device according to the first embodiment of the present invention It is a graph to show. It is a table | surface which shows the list of the phase of the electric current supplied to each exciting coil in the electromagnetic exciting apparatus which concerns on the 1st Embodiment of this invention. It is a circuit diagram which shows the connection method when generating the magnetic field of 1/2 wavelength in the electromagnetic excitation apparatus which concerns on the 1st Embodiment of this invention. It is a circuit diagram which shows the connection method when generating the magnetic field of 1/3 wavelength in the electromagnetic excitation apparatus which concerns on the 1st Embodiment of this invention. It is a circuit diagram which shows the connection method when generating the magnetic field of 1/4 wavelength in the electromagnetic excitation apparatus which concerns on the 1st Embodiment of this invention. It is a circuit diagram which shows the connection method when generating the magnetic field of 1/5 wavelength in the electromagnetic excitation apparatus which concerns on the 1st Embodiment of this invention. It is a circuit diagram which shows the connection method when generating the magnetic field of 1/6 wavelength in the electromagnetic excitation apparatus which concerns on the 1st Embodiment of this invention. It is the schematic which shows the other structure of the electromagnetic excitation system which concerns on the 1st Embodiment of this invention. It is a circuit diagram which shows the connection method when generating the magnetic field of a fundamental wave in the electromagnetic excitation apparatus which concerns on the 2nd Embodiment of this invention. It is a graph which shows the mode of the magnetic field of multiple wavelengths generated with the electromagnetic vibration apparatus which concerns on the 1st Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Electromagnetic excitation system 12, 112 Magnetic field generator 14 Superconducting coil part 16A, 16B, 16C, 16D, 16E, 16F Excitation coil 16 Surface coil group 18A, 18B, 18C, 18D, 18E, 18F Excitation coil 18 Back layer Coil group 20 Surface layer inverter 22 Back layer inverter 120 Surface layer reverse phase inverter 122 Back layer reverse phase inverter

Claims (6)

A first inverter for generating a first three-phase current;
A second phase difference for generating a phase current between the first three-phase current and a phase current between the first three-phase current and an opposite phase of the first three-phase current; A second inverter that generates a three-phase current of
A first coil group in which an even number of coils equal to 3 are adjacent to each other and arranged such that the direction of the magnetic field passing through the center of the coil faces the direction intersecting the coil arrangement direction;
The even number of coils corresponding to each of the coils of the first coil group are adjacent to each other while being shifted in the coil arrangement direction by an amount corresponding to the phase difference at the magnetic field wavelength to be generated. A second coil group arranged so that the direction of the magnetic field passing through the center of the second coil group faces the direction intersecting the coil arrangement direction;
A magnetic field generating method for a magnetic field generating device comprising:
By changing the connection state between each coil of the first coil group and the first inverter and the connection state between each coil of the second coil group and the second inverter, different wavelengths are set. A magnetic field generation method for generating a plurality of combined magnetic fields. A first inverter for generating a first three-phase current;
A second phase difference for generating a phase current between the first three-phase current and a phase current between the first three-phase current and an opposite phase of the first three-phase current; A second inverter that generates a three-phase current of
A third inverter that generates a third three-phase current that is opposite in phase to the first three-phase current;
A fourth inverter that generates a fourth three-phase current that is in reverse phase to the second three-phase current;
A first coil group in which an even number of coils equal to 3 are adjacent to each other and arranged such that the direction of the magnetic field passing through the center of the coil faces the direction intersecting the coil arrangement direction;
The even number of coils corresponding to each of the coils of the first coil group are adjacent to each other while being shifted in the coil arrangement direction by an amount corresponding to the phase difference at the magnetic field wavelength to be generated. A second coil group arranged so that the direction of the magnetic field passing through the center of the second coil group faces the direction intersecting the coil arrangement direction;
A magnetic field generating method for a magnetic field generating device comprising:
Connection state between each coil of the first coil group and the first inverter and the third inverter, and each coil of the second coil group, the second inverter, and the fourth inverter The magnetic field generation method of generating a plurality of synthetic magnetic fields having different wavelengths by changing the connection state with. A first inverter that generates a first three-phase current and a third three-phase current that is opposite in phase to the first three-phase current;
A second phase difference for generating a phase current between the first three-phase current and a phase current between the first three-phase current and an opposite phase of the first three-phase current; A second inverter that generates a third three-phase current and a fourth three-phase current that is opposite in phase to the second three-phase current;
Arranged so that an even multiple of three first coils connected to the first inverter are adjacent to each other and the direction of the magnetic field passing through the center of the first coil faces the direction intersecting the coil arrangement direction. A first coil group,
The number of coils connected to the second inverter and corresponding to each of the coils of the first coil group is an amount corresponding to the phase difference at the magnetic field wavelength to be generated. A second coil group arranged adjacent to each other while being shifted in the arrangement direction, and arranged so that the direction of the magnetic field passing through the center of the coil faces the direction intersecting the coil arrangement direction;
A magnetic field generating method for a magnetic field generating device comprising:
The combination of currents supplied to each of the coils of the first coil group by the first inverter is changed, and the combination of currents supplied to each of the coils of the second coil group by the second inverter is changed. A magnetic field generation method that changes and generates a plurality of combined magnetic fields having different wavelengths. The second inverter is capable of changing the phase difference of the second three-phase current,
The magnetic field generation method according to any one of claims 1 to 3, wherein a plurality of combined magnetic fields having different wavelengths are generated by changing the phase difference of the second three-phase current.   5. The magnetic field generating method according to claim 1, wherein the plurality of synthesized magnetic fields include a synthesized magnetic field having a fundamental wavelength and a synthesized magnetic field having a wavelength that is a fraction of the fundamental wavelength.   The magnetic field generation method according to claim 1, wherein the phase difference is an integral multiple of 30 °.

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