JP2009135346A - Movable transmission apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a movable transmission apparatus having a new structure which is simplified and downsized while suppressing a noise generated by the interference of a magnetic path in transmission of a plurality of electric signals. <P>SOLUTION: In the movable transmission apparatus, coil heads 18a, 18b having first coil members 14a, 14b extending in a circumferential direction respectively are disposed relatively movably on the same axis between an inner circumferential wall 26. An outer circumferential wall 28 of a circumferential groove 22 in a core member 12, and second coil members 36a, 36b inserted over through-holes 20, 20 extending above the center axes of the coil heads 18a, 18b and wound over the core members 12, 12, are provided. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

The present invention relates to a movable transmission device that is provided between members that are relatively displaced and performs transmission of an electrical signal using electromagnetic induction.

  Conventionally, a movable transmission device has been used as one of means for transmitting an electric signal such as electric power or a signal between members that can be relatively displaced, such as a joint portion of a robot. In general, such a movable transmission device has a pair of coil heads each provided with a coil member inside a core member made of a magnetically permeable material, facing each other with a predetermined gap therebetween so as to be relatively displaceable. Electric signals are transmitted by electromagnetically coupling the members.

  By the way, when transmitting both electric power and signals using such a movable transmission device, or when transmitting signals of two or more channels, a set of coil heads corresponding to the number of electric signals to be transmitted is used. There is a problem in that it is necessary to provide the space efficiency.

  In order to cope with such a problem, for example, Patent Document 1 discloses a movable transmission device in which a core member that transmits electric power and a core member that transmits a signal are arranged on the same central axis. However, in the movable transmission device as described in Patent Document 1, in order to avoid the occurrence of noise due to mutual interference of magnetic paths, a core member that transmits power is connected to a core member that transmits a signal and a shaft. It is still difficult to realize a sufficiently compact size because it needs to be formed large enough not to overlap in the direction. Furthermore, the positioning of the power core member and the signal core member and the positioning of the other core member facing each other must be performed with high accuracy, resulting in an increase in the manufacturing process. there were.

  On the other hand, Patent Document 2 and Patent Document 3 disclose a movable transmission device in which a power coil member and a signal coil member are provided on a common core member. In this way, it is not necessary to provide separate core members for power and signals, so that further compactness can be achieved. However, in the movable transmission device as described in Patent Documents 2 and 3, the generation of noise due to interference between the magnetic flux generated from the power coil member and the magnetic flux generated from the signal coil member is avoided. Therefore, since it is necessary to form a gap such as a groove for separating these magnetic paths between the power coil member and the signal coil member in the core member, it is difficult to realize sufficient compactness. It was. In addition, since special processing and a special mold are required to form the gap, the manufacturing is difficult and the manufacturing cost is increased.

JP-A-9-298121 Japanese Patent Laid-Open No. 7-66057 JP 11-354348 A

  Here, the present invention has been made in the background as described above, and the problem to be solved is to suppress noise caused by magnetic path interference during transmission of a plurality of electric signals. Another object of the present invention is to provide a movable transmission device having a novel structure that can be simplified and made compact.

  Hereinafter, embodiments of the present invention made to solve the above-described problems will be described. In addition, the component employ | adopted in each aspect as described below is employable by arbitrary combinations as much as possible.

  That is, according to the first aspect of the present invention, a circumferential groove that opens on one end face in the axial direction is formed on a substantially annular permeable material having a through hole on the central axis. A first coil member that is a core member having a bottom wall portion, an inner peripheral wall portion, and an outer peripheral wall portion, and that extends in a circumferential direction along the peripheral groove between opposing surfaces of the inner peripheral wall portion and the outer peripheral wall portion. Is assembled to the core member to constitute a coil head, while a pair of the coil heads are used, and the pair of coil heads are arranged on the same central axis so as to be relatively rotatable around the central axis. In addition, the axial end surfaces on the opening side of the circumferential groove in the core member of the coil heads are opposed to each other, and the pair of the first coil members in the pair of coil heads is electromagnetic. Connected in a combined state The first transmission path for transmitting at least one of electric power and signal is configured by, and is inserted across the through-holes of the pair of core members positioned opposite to each other. A second transmission for transmitting at least one of electric power and signal by providing a pair of second coil members wound across and connecting the pair of second coil members in an electromagnetically coupled state. In the movable transmission device, the path is configured.

  In the movable transmission device structured according to this aspect, for example, one of the coil head and one of the second coil members are attached to one member, and the other of the coil head and the other of the second coil members are attached to the member. Is attached to the other member that can be rotated relative to each other, so that relative rotation around the central axis of the core member is allowed between the coil heads and between the second coil members. Electric signals can be transmitted between members. Thereby, for example, by assembling the movable transmission device having the structure according to the present embodiment to the hinge of the door, it is possible to transmit an electric signal between the door and the wall portion to which the door is attached.

  Therefore, according to this aspect, the first transmission path and the second transmission path are configured using a common core member. Thereby, the movable transmission device having a plurality of transmission paths can be realized more compactly. At the same time, it is not necessary to form a gap such as a groove in the core member, so that it is possible to achieve a more compact size and a simpler configuration, which also improves manufacturing efficiency. Can be illustrated.

  In particular, in this aspect, the pair of second coil members are wound over the pair of core members through the respective through holes of the pair of core members, so that the common core member becomes a pair of first members. The second coil member is inserted. Thereby, the extending direction of the core of the first coil member and the extending direction of the core of the second coil member are orthogonal to each other, and a magnetic path extending in the axial direction of the core member by the first coil member is formed. A closed magnetic path that extends in the circumferential direction of the core member is formed by the second coil member. As a result, a plurality of transmission paths can be configured using a common core member without forming a special gap such as a groove for separating the magnetic paths, and two electrical signals can be transmitted. It is possible.

  That is, when both the first coil member and the second coil member are energized, an axial magnetic moment exerted by one of the first coil members extending in the axial direction of the core member; A circumferential magnetic moment exerted by one of the second coil members extending in the circumferential direction of the core member is synthesized. Then, an induced electromotive force is generated in the other first coil member by a mutual induction action due to an axial component of the synthesized magnetic moment, while the synthesized magnetic moment is produced in the other second coil member. The induced electromotive force is generated by the mutual induction action by the circumferential component of the. Thereby, it is possible to transmit and receive electrical signals between the pair of first coil members and between the pair of second coil members, and the present invention relates to a conventional technique in which the magnetic paths are orthogonal to each other. Based on a completely new concept, it is possible to suppress the generation of noise without forming a special gap such as a groove for separating the magnetic paths. As a result, it is possible to configure a plurality of transmission lines using a common core member, which can improve manufacturing efficiency and can be made compact.

  Note that the first transmission path and the second transmission path may transmit power or may transmit signals. For example, both the first and second transmission paths may be power transmission paths that transmit power, or both the first and second transmission paths may be signal transmission paths that transmit signals. . Preferably, as a second aspect of the present invention, in the movable transmission device according to the first aspect, the first transmission path is a power transmission path for transmitting power, and the second transmission path A mode is adopted in which the transmission path is a signal transmission path for transmitting a signal.

  That is, since the first coil member is disposed in the circumferential groove of the core member, it is easy to ensure a large number of turns as compared to the second coil member wound around the outside of the core member. Even when the pair of coil heads are rotated relative to each other, there is little change in the distance between the coil members, and more stable transmission can be performed as compared with the second transmission path. Therefore, more stable transmission can be performed by using the first transmission path as a power transmission path that requires a larger induced electromotive force than the signal.

  According to a third aspect of the present invention, in the movable transmission device according to the first or second aspect, the core members constituting the pair of coil heads are spaced apart and opposed to each other. Is a feature.

  In the movable transmission device having the structure according to this aspect, it is possible to transmit power and signals in a state where both core members are not in contact with each other. As a result, wear due to rubbing accompanying relative displacement of both core members can be avoided.

  According to a fourth aspect of the present invention, in the movable transmission device according to any one of the first to third aspects, a low permeability member is provided on at least one outer periphery of each of the core members constituting the coil head. It is characterized by being provided.

  According to this aspect, by reducing the relative magnetic permeability around the core member, it is possible to suppress leakage magnetic flux from the core member and perform more stable transmission. Here, as the low magnetic permeability member, for example, a conventionally known member such as polytetrafluoroethylene or epoxy resin can be appropriately employed.

  According to a fifth aspect of the present invention, in the movable transmission device according to any one of the first to fourth aspects, a plurality of pairs of the core members are provided, and a pair of the core members of the plurality of sets is provided. One of the second coil members assembled to each pair of core members is constituted by a connecting coil member that is inserted across the through hole and connects the pair of core members to each other. Features.

  In the movable transmission device structured according to this aspect, a greater degree of freedom can be ensured by allowing a pair of a plurality of core members to be displaced relative to each other. At the same time, the first transmission path can be configured for each pair of core members, and more transmission paths can be configured.

  Note that the pair of core members is not necessarily limited to two. For example, a set of three or more core members may be prepared, and each pair of core member sets may be connected by a connecting coil member. In this way, the degree of freedom can be further improved. Further, the connecting coil member may be a member that only connects a set of core members, or an electric signal may be taken out from the connecting coil member. Furthermore, the axial directions of the plurality of core member sets may be the same or different from each other.

  Hereinafter, in order to clarify the present invention more specifically, embodiments of the present invention will be described in detail with reference to the drawings.

  First, FIGS. 1 and 2 show a movable transformer 10 as a movable transmission device according to a first embodiment of the present invention. In the movable transformer 10, a coil head 18a configured by assembling a power coil 14a as a first coil member to the core member 12 and a power coil 14b as a first coil member are assembled to the core member 12. A pair of the coil head 18b and the coil head 18b configured as described above is configured to face each other. Since the coil heads 18a and 18b have substantially the same structure, the coil head 18a will be described below as an example, and the coil head 18b will be denoted by the corresponding reference numerals in the drawing. Detailed description is omitted.

  The core member 12 constituting the coil head 18a is a so-called pot-type core made of a ferromagnetic material such as ferrite, and has a substantially annular shape as a whole with a through hole 20 penetrating on the central axis. Has been. Furthermore, the core member 12 is formed with a lead groove 22 as a circumferential groove which is opened on one end surface in the axial direction (vertical direction in FIG. 2) and extends over the entire circumference, thereby forming the lead groove 22. A bottom wall portion 24, an inner peripheral wall portion 26 extending over the entire circumference of the lead groove 22, and an outer peripheral wall portion 28 extending over the entire periphery of the lead groove 22 are formed.

  A power wire 14a is formed by winding a lead wire formed of copper or the like in the lead groove 22 a predetermined number of times. Thus, as shown in FIG. 3, the power coil 14 a is assembled to the core member 12 so as to extend in the circumferential direction of the core member 12 along the lead groove 22 between the inner peripheral wall portion 26 and the outer peripheral wall portion 28. It has been. In the present embodiment, the lead wire constituting the power coil 14a is wound directly around the core member 12. For example, the lead wire is wound around a bobbin prepared separately from the core member 12. Then, the power coil 14a may be formed, and the bobbin provided with the power coil 14a may be mounted in the lead groove 22 to assemble the power coil 14a to the core member 12 or the like.

  FIG. 3 is a model for clarifying the extending direction of the power coil 14a, and the number of turns of the power coil 14a is appropriately set in consideration of required transmission characteristics and the like. It can be done. For example, the power coil 14 a may be wound only half a circumference of the core member 12, or may be wound in layers such that there is almost no gap in the lead groove 22.

  The coil heads 18a and 18b having such a structure are mounted on one member 30a of members 30a and 30b (see FIG. 4) in which one coil head 18a is rotated relative to each other, for example, and the other coil The head 18b is mounted on the other member 30b, and is disposed coaxially with the opening side end surfaces of the lead grooves 22 facing each other at a predetermined distance. As a result, as shown in FIGS. 1 and 2, the end surfaces 32, 32 on the opening side of the inner peripheral wall portions 26, 26 and the end surfaces 34, 34 on the opening side of the outer peripheral wall portions 28, 28 in both coil heads 18a, 18b are formed. The coil heads 18a and 18b are opposed to each other in a non-contact state at a predetermined distance in the axial direction of the coil heads 18a and 18b, and the coil heads 18a and 18b are relatively rotatable around the central axis.

  Furthermore, in the present embodiment, lead wires formed of copper or the like are inserted into the core members 12 and 12 through the through holes 20 and 20 of the core members 12 and 12 of the coil heads 18a and 18b that are opposed to each other. A pair of signal coils 36a and 36b as a second coil member are assembled by being wound a predetermined number of times across the wire. Accordingly, the pair of signal coils 36a and 36b are connected to each other by the core members 12 and 12 of the coil heads 18a and 18b. These signal coils 36a and 36b are, for example, one signal coil 36a fixedly attached to one member 30a and the other signal coil 36b fixedly attached to the other member 30b. , 30b can be relatively rotated around the central axis of the core members 12, 12 with the relative rotation of the core members 12, 12. In FIGS. 1 and 2, the number of turns of the signal coils 36a and 36b is less than one turn for easy understanding, but the number of turns of the signal coils 36a and 36b is required. It can be set as appropriate in consideration of transmission characteristics and the like. For example, it is possible to wrap a plurality of times in multiple layers.

  In particular, in the present embodiment, the signal coils 36a and 36b are wound without contacting the core member 12, but, for example, one of the signal coils 36a is integrally formed therewith. It may be fixed only to the core member 12 of the coil head 18a that is displaced, and the other signal coil 36b may be fixed only to the core member 12 of the coil head 18b that is displaced integrally therewith. Even in this case, the coil head 18a and the signal coil 36a can be rotated around the central axes of the coil heads 18a and 18b with respect to the coil head 18b and the signal coil 36b.

  In the movable transformer 10 according to the present embodiment, for example, as shown in FIG. 4, the lead wire forming the power coil 14a in the coil head 18a is electrically connected to the inverter 38 provided in the member 30a. At the same time, the lead wire forming the signal coil 36a is electrically connected to the communication circuit 40 provided on the member 30a. On the other hand, the lead wire forming the power coil 14b in the coil head 18b is electrically connected to the rectification stabilization circuit 42 provided in the member 30b, and the lead wire forming the signal coil 36b is connected to the member 30b. Is electrically connected to a communication circuit 44 provided in Thereby, transmission of electric power and a signal is enabled between the coil head 18a and the coil head 18b.

  First, a transmission path of electric power supplied from the coil head 18a to the coil head 18b will be described. As the inverter 38 to which the power coil 14a of the coil head 18a is connected, for example, a conventionally known inverter of CVCF type or VVVF type can be appropriately employed. Then, a DC voltage supplied from a power supply circuit (not shown) provided on the member 30 a is converted into a high frequency voltage by the inverter 38. Here, the frequency (output frequency) of the high-frequency voltage converted by the inverter 38 varies depending on the power to be supplied, the usage environment, etc., but in the present embodiment, it is appropriately set within a range of about 100 Hz to 500 MHz. Has been.

  Then, when the high frequency voltage converted by the inverter 38 is fed to the power coil 14a, a magnetic flux BP (see FIG. 2) that passes through the power coil 14a and changes according to the output frequency is generated. The magnetic flux BP penetrating through the power coil 14a passes through the inner peripheral wall portion 26, the bottom wall portion 24, and the outer peripheral wall portion 28 of the core member 12, and end faces 32, 32 of the inner peripheral wall portion 26 that are opposed to each other, and The end faces 34, 34 of the outer peripheral wall portion 28 enter and exit, and are linked to the power coil 14b provided in the opposing coil head 18b. Thus, in the present embodiment, the end surface 32 on the opening side of the inner peripheral wall portion 26 and the end surface 34 on the opening side of the outer peripheral wall portion 28 in the core member 12 are used as the transmitting and receiving surfaces.

  As a result, the power coils 14a and 14b are electromagnetically coupled, and an induced electromotive force is generated in the power coil 14b due to the mutual induction action. The high-frequency voltage supplied to the power coil 14a is converted into the power coil. 14b. In this way, power is transmitted from the power coil 14a to the power coil 14b in a non-contact state. The high-frequency voltage extracted from the power coil 14b is converted to a DC voltage by the rectifying and stabilizing circuit 42 and then supplied to the communication circuit 44 and the like. Thus, in this embodiment, a pair of first coil members is configured by the power coils 14a and 14b, and the first transmission path configured by the power coils 14a and 14b supplies power. The transmission line for power transmission is used.

  Next, transmission paths for signals transmitted and received between the coil head 18a and the coil head 18b will be described. First, a signal generated by a control circuit (not shown) provided on the member 30a is superimposed on a high frequency voltage by the communication circuit 40 to which the signal coil 36a is connected, and then supplied to the signal coil 36a. The high-frequency voltage on which the signal is superimposed is generated by the communication circuit 40, and the frequency varies depending on the data size of the signal, the usage environment, etc. It is appropriately set within a range of about 100 Hz to 10 GHz.

  When a high frequency voltage is supplied to the signal coil 36a, a magnetic flux that passes through the signal coil 36a and changes according to the output frequency is generated. Here, in the present embodiment, the core members 12 and 12 are inserted into the signal coil 36 a so that substantially all of the magnetic flux passing through the signal coil 36 a passes through the core members 12 and 12. Has been. A closed magnetic circuit is formed by the core members 12 and 12, and the magnetic flux generated in the signal coil 36 a extends in the circumferential direction of the core members 12 and 12 and is extrapolated to the core members 12 and 12. It is linked to the signal coil 36b. As a result, the signal coils 36a and 36b are electromagnetically coupled, and an induced electromotive force is generated in the signal coil 36b due to the mutual induction action, and the high-frequency voltage supplied to the signal coil 36a is converted into the signal coil 36b. Taken from.

  In this way, power is transmitted from the signal coil 36a to the signal coil 36b in a non-contact state. The signal superimposed on the high-frequency voltage extracted from the signal coil 36b is extracted by the communication circuit 44 and then transmitted to various control circuits (not shown) provided on the member 36b. Thus, in the present embodiment, a pair of second coil members is configured by the signal coils 36a and 36b, and the second transmission path configured by the signal coils 36a and 36b transmits signals. It is a transmission path for signals to be transmitted.

  For example, a signal can be transmitted from the member 30b to the member 30a. In such a case, in contrast to the case where the signal is transmitted from the member 30a to the member 30b as described above, a signal generated by a control circuit (not shown) provided in the member 30b is generated by the communication circuit 44 at a high frequency. After being superimposed on the voltage and transmitted from the signal coil 36 b to the signal coil 36 a through the core members 12 and 12 in a non-contact state, the signal is extracted from the high-frequency voltage by the communication circuit 40.

  In the movable transformer 10 having such a structure, a pair of signal coils 36a and 36b are provided across the core members 12 and 12 opposed to each other, thereby reducing noise as much as possible. However, it is possible to transmit two electric signals of electric power and signal using the common core members 12 and 12. That is, in the present embodiment, the extending direction of the cores of the power coils 14 a and 14 b is the axial direction of the core member 12, while the extending direction of the cores of the signal coils 36 a and 36 b is the circumference of the core member 12. By setting the direction, the magnetic flux generated from the power coil 14a and the magnetic flux generated from the signal coil 36a are substantially orthogonal to each other. As a result, the magnetic flux generated from the power coil 14a is linked to the signal coil 36b to generate noise electromotive force in the signal coil 36b, or the magnetic flux generated from the signal coil 36a is The possibility of generating a noise electromotive force in the power coil 14b in linkage with the power supply 14b is reduced or avoided. As a result, in the movable transformer 10 according to the present embodiment, a gap such as a groove that separates the magnetic path formed by the power coil 14a and the magnetic path formed by the signal coil 36a is not formed in the core member 12. In both cases, it is possible to transmit power and signals while suppressing the generation of noise, and it is possible to achieve further downsizing of the movable transmission device that transmits power and signals.

  Further, in the present embodiment, the power coils 14a and 14b forming the power transmission path are disposed in the lead groove 22 of the core member 12, so that the cores are formed on both the inner and outer sides of the power coils 14a and 14b. An inner peripheral wall portion 26 and an outer peripheral wall portion 28 of the member 12 are disposed. As a result, almost the entire power transmission path that requires a larger magnetic flux than that of signal transmission is formed in the core member 12, and a large amount of magnetic flux is stably secured. The power transmission can be performed stably.

  Note that the movable transmission device having the structure according to the present embodiment is preferably applied to, for example, a driving device 45 as shown in FIG. The driving device 45 has a structure in which a rotating plate 47 is rotatably attached to a base 46. The base 46 is provided with an electric motor 48, and a rotating plate 47 is attached to an output shaft 49 of the electric motor 48. Thereby, the rotating plate 47 can be rotated around the output shaft 49 in a state of being separated from the base 46 by a predetermined distance.

  The base 46 is provided with one coil head 18a and one signal coil 36a of the movable transformer 10 of the present embodiment, and the rotating plate 47 is provided with the other coil head 18b and the other signal coil 36b. Is provided. Here, the coil heads 18a and 18b are coaxially arranged with the end faces 32 and 34 facing each other, and the output shaft 49 of the electric motor 48 passes through the coil heads 18a and 18b. It is inserted into the holes 20 and 20 and attached to the rotating plate 47. Thereby, both the coil heads 18a and 18b and both the signal coils 36a and 36b are relatively rotatable around the central axis.

  In this way, power and signals can be transmitted between the base 46 and the rotating plate 47 that are not contacted with each other and are relatively rotated. By using the movable transformer 10 having a structure according to the present invention, it is possible to more compactly configure the electric signal transmission path between the base 46 and the rotating plate 47.

  Next, FIG. 6 shows a movable transformer 50 as a movable transmission apparatus according to the second embodiment of the present invention. In the following description, members substantially the same as those in the above-described embodiment are denoted by the same reference numerals as those in the above-described embodiment, and detailed description thereof is omitted.

  The movable transformer 50 includes coil heads 18a and 18b having a structure substantially similar to that of the first embodiment described above. In particular, in the present embodiment, substantially the entire outer peripheral portion of the core member 12 of each of the coil heads 18a and 18b excluding the end faces 32 and 34 serving as the transmitting and receiving surfaces has a substantially bottomed cylindrical shape that opens in one axial direction. Covered with a gap member 52 as a low magnetic permeability member. Here, a through hole 54 penetrating in the thickness direction is formed in the central portion of the bottom portion of the gap member 52, and the through hole 54 and the through hole 20 of the core member 12 when the core member 12 is mounted. Communicated. The signal coils 36 a and 36 b are inserted into the through holes 20 and 54, and are wound around the core members 12 and 12 around the outside of the gap member 52. In addition, as the gap member 52, a conventionally known member having a small relative magnetic permeability can be appropriately employed, and specifically, polytetrafluoroethylene, an epoxy resin, or the like is exemplified. More preferably, a non-conductive member is employed as the gap member 52. In the present embodiment, polytetrafluoroethylene is used as the gap member 52.

  According to the movable transformer 50 having such a structure, since the gap member 52 having a low magnetic permeability is disposed on the outer peripheral surface of the core member 12, the magnetic flux generated from the power coil 14a is generated. Jumping out of the core member 12 can be suppressed more advantageously. Thereby, more stable transmission can be performed.

  Further, particularly in the present embodiment, the gap member 52 is formed of a non-conductive material. As a result, the occurrence of eddy currents due to the influence of the magnetic lines of force is suppressed, and the possibility that the magnetic energy of the power coils 14a, 14b and the signal coils 36a, 36b can be reduced by the eddy currents is reduced.

  The gap member 52 is not necessarily provided in both the coil heads 18a and 18b, and may be provided in only one of the coil heads 18a and 18b. Further, although the gap member 52 in the present embodiment has a bottomed cylindrical shape, the bottom portion is not necessarily required, and the gap member 52 may have a cylindrical shape that opens on both sides in the axial direction.

  Next, FIG. 7 shows a movable transformer 60 as a movable transmission apparatus according to the third embodiment of the present invention. In the movable transformer 60, a pair of coil heads 18a and 18b having substantially the same structure as that of the first embodiment described above are opposed to each other with a predetermined distance in the axial direction. In particular, in the present embodiment, the lead wire formed of copper or the like is wound a predetermined number of times on the outer peripheral surface 62 of the outer peripheral wall portion 28 constituting the outer peripheral surface of each core member 12 in the coil heads 18a and 18b. As a result, the signal coils 64a and 64b are formed. Thus, the signal coils 64 a and 64 b are assembled on the outer peripheral surface 62 of the core member 12 so as to extend in the circumferential direction of the core member 12. The number of turns of the signal coils 64a and 64b can be appropriately set in consideration of required transmission characteristics and the like, and is not limited at all. For example, only the half circumference of the core member 12 is wound. For example, the core member 12 may be overlapped and wound a plurality of times. The number of turns of the signal coils 64a and 64b may be the same or different.

  Further, a cancel coil 66 as a noise suppressing coil is assembled to the outer peripheral surface 62 of the core member 12 of the coil head 18b. The cancel coil 66 is formed by winding a lead wire made of copper or the like a predetermined number of times in substantially the same manner as the signal coil 64 b, whereby the cancel coil 66 is formed on the outer peripheral surface of the core member 12. It is assembled so as to extend in the circumferential direction of the core member 12 on 62. Note that the number of turns of the cancel coil 66 is appropriately set in consideration of a noise electromotive force that may be generated in the signal coil 64b. For example, only a half circumference of the core member 12 may be wound. Alternatively, the core member 12 may be overlapped and wound a plurality of times.

  The movable transformer 60 having such a structure includes, for example, members 68a and 68b (see FIG. 8) in which one coil head 18a assembled with a signal coil 64a and one signal coil 36a are rotated relative to each other. The other coil head 18b assembled with the signal coil 64b and the other signal coil 36b are attached to the other member 68b. Thereby, the coil head 18a and the signal coil 36a, and the coil head 18b and the signal coil 36b can be rotated around the central axes of the coil heads 18a and 18b, respectively.

  As shown in FIG. 8, for example, as shown in FIG. 8, the movable transformer 60 in this embodiment includes a lead wire and a signal coil 36a that form the power coil 14a in the coil head 18a. The lead wires to be formed are electrically connected to the inverter 38 and the communication circuit 40 provided on the member 68a, respectively, while the lead wire and the signal coil 36b that form the power coil 14b in the coil head 18b are formed. The lead wires to be connected are electrically connected to the rectification stabilization circuit 42 and the communication circuit 44 provided on the member 68b, respectively. Furthermore, the lead wire forming the signal coil 64a that is displaced integrally with the coil head 18a is electrically connected to the communication circuit 70 provided on the member 68a, while being displaced integrally with the coil head 18b. A lead wire forming the signal coil 64b to be fastened is electrically connected to a communication circuit 72 provided on the member 68b. The communication circuits 70 and 72 have substantially the same structure as the communication circuits 40 and 44 in the first embodiment described above.

  Furthermore, a lead wire forming a cancel coil 66 that is displaced integrally with the coil head 18b is electrically connected to a noise removal circuit 74 provided on the member 68b. The noise removal circuit 74 supplies a predetermined high-frequency voltage having a preset frequency and voltage to the cancel coil 66. Here, as the predetermined high-frequency voltage supplied by the noise removal circuit 74, a back electromotive force for reducing the noise electromotive force generated in the signal coil 64b due to the magnetic flux generated by the power coil 14a is signaled. A high frequency voltage that can cause the magnetic flux generated in the coil for use 64b by energizing the cancel coil 66 is employed. Further, as the back electromotive force for reducing the noise electromotive force, a high frequency voltage having the same voltage in the opposite phase to the noise electromotive force or a high frequency voltage close to it is desirable. The frequency of the high-frequency voltage supplied to the cancel coil 66 and the preferred value of the voltage are, for example, the frequency of the high-frequency voltage supplied to the cancel coil 66 while measuring the amount of noise mixed in the electrical signal extracted from the signal coil 64b. Further, by gradually changing the voltage and measuring the increase or decrease of the noise amount, it is possible to tune to a suitable value.

  As in the first embodiment described above, power is transmitted between the power coils 14a and 14b and signals are transmitted and received between the signal coils 36a and 36b. In addition, particularly in the present embodiment, signals can be transmitted and received between the signal coils 64a and 64b.

  First, a signal generated by a control circuit (not shown) provided on the member 68a by the communication circuit 70 to which the signal coil 64a is connected is superimposed on the high frequency voltage and then supplied to the signal coil 64a. . The high-frequency voltage on which the signal is superimposed is generated by the communication circuit 70, and the frequency varies depending on the data size of the signal, the usage environment, etc. It is appropriately set within a range of about 100 Hz to 10 GHz.

  When a high frequency voltage is fed to the signal coil 64a, a magnetic flux that passes through the signal coil 64a and changes according to the output frequency is generated. The magnetic flux passing through the signal coil 64a passes through the outer side wall portion 28 of the core member 12 and the outside of the core member 12, and the end surfaces 34, 34 and the outer circumferential surface of the outer circumferential wall portion 28 facing each other. 62 enters and exits and interlinks with a signal coil 64b provided on the opposing coil head 18b.

  As a result, the signal coils 64a and 64b are electromagnetically coupled, and an induced electromotive force is generated in the signal coil 64b due to the mutual inductive action. The high-frequency voltage supplied to the signal coil 64a is converted into the signal coil. 64b. In this way, power is transmitted from the signal coil 64a to the signal coil 64b in a non-contact state. The signal superimposed on the high-frequency voltage extracted from the signal coil 64b is extracted by the communication circuit 72, and then transmitted to various control circuits (not shown) provided on the member 68b. Thus, in the present embodiment, a pair of third coil members is configured by the signal coils 64a and 64b, and the third transmission path configured by the signal coils 64a and 64b transmits signals. It is a transmission path for signals to be transmitted.

  Further, particularly in the present embodiment, a predetermined high-frequency voltage is supplied from the noise removal circuit 74 provided to the member 68b to the cancel coil 66, and a magnetic flux that changes according to the output frequency is generated through the cancel coil 66. . The magnetic flux generated from the canceling coil 66 is linked to the signal coil 64b, so that the signal electromotive force is reduced or eliminated in the signal coil 64b due to the magnetic flux generated from the power coil 14a. The induced electromotive force is generated. As a result, it is possible to reduce or eliminate noise mixed in the signal extracted from the signal coil 64b.

  Note that, for example, a signal can be transmitted from the member 68b to the member 68a. In such a case, in contrast to the case where the signal is transmitted from the member 68a to the member 68b as described above, a signal generated by a control circuit (not shown) provided in the member 68b is generated by the communication circuit 72 at a high frequency. After being superimposed on the voltage and transmitted from the signal coil 64 b to the signal coil 64 a through the core members 12 and 12 in a non-contact state, the signal is extracted from the high-frequency voltage by the communication circuit 70.

  In the movable transformer 60 having such a structure, the signal coils 64a and 64b are electromagnetically coupled by using the outer portion of the outer peripheral wall portion 28 of the core member 12, and these signal coils 64a. , 64b can transmit a signal. That is, in the present embodiment, the signal coils 64a and 64b are assembled to the outside of the core member 12, and the core member is not provided to the outside of the signal coils 64a and 64b. The relative permeability around 64b is made sufficiently smaller than the relative permeability of the core member 12. The magnetic flux generated from the power coil 14a cooperates with the characteristics of the magnetic field lines taking the shortest path that minimizes the magnetic resistance, so that almost no magnetic flux passes through the outer portion of the outer peripheral wall portion 28 of the core member 12. While passing through the inner portion of the portion 28, the magnetic flux generated from the signal coil 64 a passes through the outer portion of the outer peripheral wall portion 28. Thus, in the movable transformer 60 according to the present embodiment, a gap such as a groove that separates the magnetic path formed by the power coil 14a and the magnetic path formed by the signal coil 64a is not formed in the core member 12. In both cases, it is possible to reduce the interference between the magnetic flux that transmits power and the magnetic flux that transmits signals as much as possible, and to transmit power and signals while suppressing the occurrence of noise. As a result, it is possible to form the first to third three transmission paths using the common core member 12, and the power transmission path by the first transmission path and the second and third transmission paths. It is possible to form a 2-channel signal transmission path in a compact manner.

  Furthermore, in the present embodiment, the cancel coil 66 is provided in the coil head 18b, and the magnetic flux generated from the power coil 14a by the high frequency voltage supplied from the noise removal circuit 74 to the cancel coil 66 is used. As a result, the noise electromotive force generated in the signal coil 64b can be reduced. As a result, it is possible to more effectively reduce or eliminate noise mixed in the signal extracted from the signal coil 64b with a simple configuration without using a complicated configuration such as a filter circuit. Even when signals are transmitted simultaneously, stable signal transmission / reception can be performed.

  Next, FIG. 9 shows a movable transformer 80 as a fourth embodiment of the present invention. In the movable transformer 80, in addition to the first embodiment described above, another signal coil 82 is wound as a second coil member across the through holes 20 and 20 of the coil heads 18a and 18b. Yes. In this way, signals can be transmitted and received between the three signal coils 36a, 36b, and 82. Here, the coil for transmitting and receiving the electrical signal may be any of the signal coils 36a, 36b, and 82. Alternatively, any one of the signal coils 36a, 36b, 82 may be used as a transmission coil and received by the remaining two. Thus, the number of the second coil members in the present invention is not particularly limited, and more second coil members may be provided.

  FIG. 10 shows a movable transformer 90 as a fifth embodiment of the present invention. In the movable transformer 90, signal coils 36a and 36b as second coil members are wound over two sets of the same coil heads 18a and 18b as in the first embodiment. In this way, power can be transmitted between the one coil heads 18a and 18b, and power can be transmitted between the other coil heads 18a and 18b. As is apparent from this embodiment, the set of coil heads around which the second coil member is wound is not necessarily limited to one set, and may be wound across a plurality of sets of coil heads. .

  Further, FIG. 11 shows a movable transformer 100 as a sixth embodiment of the present invention. The movable transformer 100 includes two sets of coil heads 18a and 18b having the same structure as that of the first embodiment described above, and a connecting coil straddling the through hole 20 of the set of the coil heads 18a and 18b. A connecting coil 102 as a member is inserted, and a set of these coil heads 18a and 18b is connected so as to be capable of relative displacement. The signal coil 104a is inserted into the through hole 20 of the set of one coil head 18a, 18b, while the signal coil 104b is inserted into the through hole 20 of the set of the other coil head 18a, 18b. Yes. Thus, one signal coil 104a and the coupling coil 102 constitute a pair of one second coil member, and the other signal coil 104b and the coupling coil 102 constitute the other second coil member. Are configured. According to the present embodiment, for example, an induced electromotive force is generated in the connecting coil 102 from one signal coil 104a via the one coil head 18a, 18b around which the signal coil 104a is wound. The induced electromotive force generated in the coupling coil 102 is transmitted to the other signal coil 104b via the other coil heads 18a and 18b. In this way, the degree of freedom of relative displacement of the signal coils 104a and 104b can be further increased.

  It should be noted that a larger number of sets of coil heads 18a and 18b may be provided between the signal coils 104a and 104b by using a larger number of the connecting coils 102 as described above. Further, although the above-described connecting coil 102 is an annular coil, a lead wire forming the connecting coil 102 is illustrated as in the movable transformer 110 as the seventh embodiment of the present invention shown in FIG. It may be connected to a power supply circuit or a communication circuit that is not connected to extract power and signals from the coupling coil 102 or transmit power and signals from the coupling coil 102.

  FIG. 13 shows a movable transformer 120 as an eighth embodiment of the present invention. The movable transformer 120 includes two sets of coil heads 18a and 18b having the same structure as that of the first embodiment described above, and the axial directions of the sets of the coil heads 18a and 18b are orthogonal to each other. Yes. The sets of the coil heads 18a and 18b are connected to each other by inserting the connecting coil 122 into the respective through holes 20, and the signal is sent to the through hole 20 of the set of the one coil heads 18a and 18b. The signal coil 124b is inserted into the through-hole 20 of the set of the other coil heads 18a and 18b. Accordingly, one signal coil 124a and the coupling coil 122 constitute a pair of one second coil member, and the other signal coil 124b and the coupling coil 122 constitute the other second coil member. The extension directions of the cores of the signal coils 124a and 124b are orthogonal to each other. According to this embodiment, like the movable transformers 100 and 110 in the sixth and seventh embodiments described above, the degree of freedom of relative displacement of the signal coils 124a and 124b can be increased. As is clear from this embodiment, when a plurality of sets of coil heads are provided, the axial directions of the sets of coil heads do not necessarily have to be equal.

  As mentioned above, although several embodiment of this invention has been explained in full detail, these are illustrations to the last, Comprising: This invention is not limited at all by the specific description in this embodiment. .

  For example, the core members 12 and 12 positioned opposite to each other have the same structure and have substantially the same inner diameter and outer diameter, but these dimensions do not necessarily have to be equal to each other. Therefore, it may be made different to such an extent that transmission is not hindered.

  Further, for example, the cancel coil 66 in the third embodiment described above is not always necessary, but a cancel coil may be provided in the lead groove 22, for example. The noise removing circuit 74 is configured to supply a predetermined high-frequency voltage set in advance to the canceling coil 66. For example, the noise removing circuit 74 detects the noise electromotive force generated in the signal coil 36b and detects the noise. Depending on the result, the frequency or voltage of the high frequency voltage supplied to the cancel coil 66 may be changed.

  In addition, although not enumerated one by one, the present invention can be carried out in a mode to which various changes, modifications, improvements and the like are added based on the knowledge of those skilled in the art. It goes without saying that all are included in the scope of the present invention without departing from the spirit of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS Explanatory drawing for demonstrating the movable transmission apparatus as 1st embodiment of this invention. Sectional explanatory drawing for demonstrating the movable transmission apparatus. Explanatory drawing for demonstrating one side of the coil head which comprises the movable transmission apparatus. FIG. 2 is a block diagram schematically illustrating the movable transmission device. Partial cross-sectional explanatory drawing for demonstrating the application example of the movable transmission apparatus. Cross-sectional explanatory drawing for demonstrating the movable transmission apparatus as 2nd embodiment of this invention. Explanatory drawing for demonstrating the movable transmission apparatus as 3rd embodiment of this invention. FIG. 2 is a block diagram schematically illustrating the movable transmission device. Explanatory drawing for demonstrating the movable transmission apparatus as 4th embodiment of this invention. Explanatory drawing for demonstrating the movable transmission apparatus as 5th embodiment of this invention. Explanatory drawing for demonstrating the movable transmission apparatus as the 6th embodiment of this invention. Explanatory drawing for demonstrating the movable transmission apparatus as 7th Embodiment of this invention. Explanatory drawing for demonstrating the movable-type transmission apparatus as 8th embodiment of this invention.

Explanation of symbols

10: Movable transformer, 12: Core member, 14a, b: Power coil, 18a, b: Coil head, 20: Through hole, 22: Lead groove, 24: Bottom wall part, 26: Inner peripheral wall part, 28: Outer peripheral wall part 32: end face 34: end face 36a, b: signal coil

Claims (5)

  By forming a circumferential groove that opens at one end face in the axial direction with respect to a substantially annular magnetic permeable material having a through hole on the central axis, a bottom wall portion, an inner circumferential wall portion, and an outer circumferential wall portion of the circumferential groove are formed. And a first coil member extending in the circumferential direction along the circumferential groove between the opposing surfaces of the inner peripheral wall portion and the outer peripheral wall portion is assembled to the core member. On the other hand, a pair of the coil heads are used, and the pair of coil heads are arranged on the same central axis so as to be relatively rotatable around the central axis, and the cores of the coil heads The axial end surfaces of the circumferential groove on the opening side of the member are positioned to oppose each other, and the pair of the first coil members in the pair of coil heads are coupled in an electromagnetically coupled state, thereby generating electric power and At least the signal A first transmission path that performs one transmission is configured, and is inserted across the through-holes of the pair of core members opposed to each other and wound around the pair of core members. A pair of second coil members is provided, and a pair of these second coil members are connected in an electromagnetically coupled state, thereby forming a second transmission path for transmitting at least one of electric power and signals. A movable transmission device characterized by that.   The movable transmission device according to claim 1, wherein the first transmission path is a power transmission path for transmitting power, and the second transmission path is a signal transmission path for transmitting a signal. .   3. The movable transmission device according to claim 1, wherein the core members constituting the pair of coil heads are opposed to each other at a distance from each other.   The movable transmission device according to any one of claims 1 to 3, wherein a low magnetic permeability member is provided on an outer periphery of at least one of the core members constituting the coil head.   A plurality of pairs of the core members are provided, and each core member is connected by a connecting coil member that is inserted over the pair of through holes of the plurality of core members and connects the pair of core members to each other. 5. The movable transmission device according to claim 1, wherein one of the second coil members assembled into a pair of the first and second coil members is configured.

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