JP3642352B2 - Rotating transformer - Google Patents

Description

001
[Industrial application fields]
The present invention relates to a rotary transformer composed of a thin film conductor pattern such as a sheet coil.
[002]
[Prior art]
Conventionally, as a transformer for a charging device, a pair of spiral coils having opposite spiral directions are formed on the front and back of a thin foil substrate made of an insulating material, and the front and back sides are formed by through holes provided in the center of the spiral. A spiral coil is connected to form a secondary coil of a transformer, and this secondary coil is opposed to the primary side of a transformer in which a coil is wound around a cylindrical core (for example, Japanese Utility Model Publication No. 58-80755).
003
[Problems to be solved by the invention]
Although it is conceivable to change the primary coil of the conventional transformer to the secondary coil of the transformer for thinning, it can be applied to a rotary transformer, but there are the following problems.
The secondary coil interlinks with the magnetic flux generated by the primary coil while rotating.
When the primary coil spiral and the secondary coil spiral overlap each other, the phase angle of the primary coil spiral and the secondary coil spiral is 0 degrees, 90 degrees, 180 degrees, and 270 degrees. 4 (a), (b), (c), and (d), the magnetic flux linkage part of the secondary side coil is shown by the shaded part in FIG. It changes with it. If the secondary coil rotates once, a one-cycle ripple appears in the flux linkage, and a one-cycle ripple occurs in the induced voltage of the secondary coil as shown in FIG.
Thus, when a rotary transformer in which an induced voltage ripple occurs is used for a detector such as a resolver or for signal transmission, a large error occurs. In addition, if the number of turns of the coil must be reduced, the spiral trajectory becomes rough, so that the amount of change in the interlinkage magnetic flux area with respect to the rotation angle further increases and the induced voltage ripple further increases. There's a problem.
SUMMARY OF THE INVENTION An object of the present invention is to provide a sheet coil type rotary transformer that eliminates the ripple of the induced voltage that occurs with rotation and can be easily configured with high accuracy.
[004]
[Means for Solving the Problems]
As means for solving the above problems, a sheet coil type rotary transformer is configured as follows.
The secondary side of the transformer composed of a pair of secondary conductor patterns formed on the front and back surfaces of the thin film substrate 1 made of an insulating material and the through holes connecting the conductor patterns is connected to the primary side of the transformer via a gap. In the rotary transformer facing
The secondary side conductor pattern is formed by multi-stage concentric thin film conductors 2o, 2z, 7o,.
The conductor pattern 2 on the front side is connected to the terminal 2t on the surface where the end of the outermost thin film conductor 2o is connected by the lead 4a, and the ends of the thin film conductors 2o. A jumper wire 5 that is sequentially connected obliquely toward the inner stage and an end of the innermost thin-film conductor 2z are constituted by leads 4b that are connected to the through holes 6.
The back side conductor pattern 7 is directed from the inner step to the outer step with the through hole 6 connecting the end portion of the innermost conductor pattern 7z and the opposite end portions of the thin film conductor 7o. The jumper wire 8 is connected to the jumper wire 5 of the conductor pattern 2 on the front side and connected obliquely and sequentially, and the back side terminal 9t is connected to the end of the outermost thin film conductor 7o by the lead 4d.
The conductor pattern 2 on the front side and the conductor pattern 7 on the back side are connected through the through hole 6 to constitute the secondary side of the transformer in which the currents induced in the conductor patterns 2 and 7 are in the same direction.
Note that the primary side of the transformer may have the same configuration as the secondary side.
[005]
[Action]
With the above configuration, since the secondary conductor has a concentric shape centered on the center C of the rotation axis, the interlinkage magnetic flux area of the secondary conductor does not change with respect to the rotation of the secondary conductor. Also, it is not affected by the increase or decrease in the number of turns of the secondary winding.
[006]
【Example】
An embodiment of the present invention will be described below with reference to FIG.
A multi-stage concentric front side thin film centered around a rotation center C with a minute gap 3 provided in part on the front side and back side of the substrate 1 with a substrate 1 made of a disk-like thin film insulating sheet layer in between. Conductors 2o... 2z and thin film conductors 7o... 7z on the back side are formed by etching, PVD, CVD, or the like. For the sake of explanation, in the figure, the thin film conductors 2o, 2z (solid line) on the front side and the thin film conductors 7o, 7z (broken line) on the back side are shifted from each other, but are concentrically centered on the rotation center C. They are arranged so as to overlap. Further, although the gap 3 is provided on the radial direction / straight line, it is not always necessary.
The conductive pattern 2 on the surface is connected as follows.
First, the lead 4 connects the front-side terminal 2t and one end of the outermost thin-film conductor 2o.
The other end of the thin film conductor 2o is obliquely connected to one end of the thin film conductor 2p immediately inside the thin film conductor 2o by a jumper wire 5. The other end of the thin film conductor 2p is obliquely connected to one end of the thin film conductor 2q immediately inside the thin film conductor 2p by a jumper wire 5. In the same manner, the jumper wires 5 are sequentially connected to the innermost thin film conductor 2z. The other end of the innermost thin-film conductor 2z is connected to one end of the back-side thin-film conductor 7z through the through hole 6 by a lead 4c.
The conductor pattern 7 on the back side is connected as follows.
The other end of the thin film conductor 7z having one end connected to the lead 4c is connected to one end of the outer thin film conductor 7y. Hereinafter, contrary to the conductor pattern 2 on the front side, the thin film conductor 7o is sequentially connected from the inner side to the outer side by jumper wires 8 linked to the jumper wire 5 of the front side conductor pattern 2, and the outermost side. The other end of the thin film conductor 7o is connected to the terminal 9t on the back side by a lead 4d.
As a result, the secondary side of the transformer is configured in which the direction of the current flowing through the conductor pattern 2 on the front side and the conductor pattern 7 on the back side is the same.
The primary side of the transformer may be the same as the conventional one, or may be configured as the secondary side of the present invention, and the rotary transformer with the secondary side of the transformer facing the primary side of the transformer with a gap. Is configured.
[007]
The operation will be described below.
When the conductor pattern on the secondary side rotates, it interlinks with the magnetic flux created on the primary side of the transformer. When the point on the secondary side conductor pattern and the point on the primary side of the transformer are used as a reference, the phase angle between the primary side and secondary side conductor pattern of the transformer is 0 degrees, 90 degrees, 180 degrees, The magnetic flux linkage part of the secondary side conductor pattern with respect to 270 degrees is as shown by the hatched part in FIGS. 2 (a), (b), (c), and (d).
As can be seen from the figure, the secondary side conductor pattern has a concentric shape with the center C of the rotation axis as the center, so the interlinkage magnetic flux area of the secondary side conductor pattern is the secondary side conductor pattern. Does not change with respect to rotation. Therefore, the relationship between the rotation angle and the induced voltage does not cause ripples during rotation, as shown in FIG.
[008]
【The invention's effect】
As described above, the present invention has the following effects.
Since there is no ripple in the induced voltage of the conductor pattern on the secondary side, a highly accurate rotary transformer can be realized.
[Brief description of the drawings]
FIG. 1 is a plan view showing a secondary-side conductor pattern according to an embodiment of the present invention.
FIGS. 2A and 2B are schematic diagrams showing interlinkage magnetic flux portions at the phase angle of the primary and secondary conductor patterns of the transformer according to the embodiment of the present invention, FIG. 180 degrees, (d) 270 degrees.
FIG. 3 is a graph showing a relationship between a phase angle and an induced voltage according to an embodiment of the present invention.
FIGS. 4A and 4B are schematic diagrams showing interlinkage magnetic flux portions at phase angles of a primary coil and a secondary coil according to the prior art, (a) 0 degree, (b) 90 degrees, (c) 180 degrees, (d) 270 degrees.
FIG. 5 is a graph showing the relationship between the phase angle and the induced voltage according to the prior art.
[Explanation of symbols]
1 Substrate 2, 7 Conductor pattern 2o, 2z, 7o, 7z Thin film conductor 2t, 9t Terminal 3 Gap 4, 4a, 4b, 4c, 4d Lead 5, 8 Jumper wire 6 Through hole

Claims (1)

In a rotary transformer in which a secondary side of a transformer in which a pair of secondary side conductor patterns formed on the front and back sides of a thin film substrate made of an insulating material are connected through a through hole is opposed to a primary side of the transformer and a gap. ,
The secondary conductor pattern is formed by a multi-stage concentric thin film conductor having a gap in a part of a circle,
A front-side terminal for connecting the outermost conductor pattern to the outermost end of the thin-film conductor, and a jumper wire for connecting the end portions of the thin-film conductor at the gaps in an oblique manner from the outside to the inside. The innermost thin film conductor is configured with a through hole that connects the end portions of the thin film conductor,
The conductor pattern on the back side is linked with the jumper wire on the front side so that the end portions of the thin film conductor are interlinked with the through hole connecting the end portion of the innermost thin film conductor and the gap portion, and from the inside to the outside. A rotary transformer comprising jumper wires that are sequentially connected obliquely and terminals on the back side that connect end portions of the outermost thin-film conductor.

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