JPH09115101A - Crosstalk phenomenon analyzer and rotary transformer optimized by using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to easily optimize the parameters, such as the number of turns of coils, material characteristics of magnetic cores and the material characteristics of short rings, in designing a rotary transformer by exactly analyzing crosstalk phenomenon. SOLUTION: This crosstalk phenomenon analyzer has a data input section 1 which inputs the physical parameters of an object to be analyzed, a magnetic field calculation section 2 which calculates the crosstalk quantity generated by a magnetic field phenomenon, an electric field calculation section 3 which calculates the crosstalk quantity generated by an electric field phenomenon and a result output section 4 which outputs the results of the analysis by this calculation sections 2, 3. The calculation of the eddy current generated in a conductive member by the change with time of magnetic flux density and the analysis of an electric circuit interlocked to the magnetic field phenomenon are included in the processing to be executed by the magnetic field calculation section 2. The electric field calculation section 3 calculates the crosstalk quantity by using the induced electromotive force calculated by the current obtd. as the result of the analysis by the magnetic field calculation section 2 and the parameters of the electric circuit.

Description

Detailed Description of the Invention

[0001]

The present invention relates to audio equipment,
The present invention relates to a device for analyzing a crosstalk phenomenon occurring in a magnetic recording / reproducing device of a rotary magnetic head type used for video equipment, computer peripherals, etc., and a rotary transformer with less crosstalk between channels optimized using this device. is there.

[0002]

2. Description of the Related Art In a magnetic recording / reproducing apparatus of a rotary magnetic head type such as a VTR and a DDS, a rotary transformer is used as a signal transmission means. FIG. 2A is a sectional view of the rotary transformer, and FIG.
As shown in (b), the fixed-side magnetic core 11, the rotating magnetic core 12, the fixed magnetic core 11 for multi-channel signal transmission, and the fixed-side coil 13 formed on the facing surface of the rotating magnetic core 12. And the rotating side coil 14. As shown in the equivalent circuit diagram of FIG. 3, a magnetic head 16 for recording / reproducing is connected to each of the rotating coils 14 of the rotary transformer.
The signal source 17 and the resistor 18 are also connected to each of the three.

In such a rotating transformer, it is necessary to maximize the signal transmission rate in a desired channel (a pair of opposed fixed and rotating coils) and to reduce crosstalk between channels as much as possible. As means for reducing the crosstalk between channels, a short ring 15 is conventionally provided between adjacent fixed-side coils 13 (or rotating-side coils 14). It is important to optimize the material characteristics of the fixed magnetic core 11 and the rotating magnetic core 12 and the design parameters such as the number of turns of the fixed coil 13 and the rotating coil 14 in order to reduce the crosstalk.

Conventionally, in the design of a rotary transformer, optimization of parameters such as the number of turns of a coil, the material characteristics of a magnetic core, and the material of a short ring has been mainly performed by trial and process.
Was done with an error. Also, although there are insufficient points as described later, attempts have been made to optimize the design parameters of the rotary transformer by computer simulation (Sakata, Tanaka: "Rotary Transformer" National Technical
Report, vol.18, No.4, p357 (1972), Ota: "Characteristic Analysis of VTR Rotary Transformer by Finite Element Method", Sumitomo Special Metals Technical Report, vol.8, p47 (1985)).

[0005]

However, in the above-described design method based on try and error, the reproducibility of the experimental results is not good, and it is difficult to say that optimization has been performed reliably. In addition, the conventional computer simulation is an analysis method in which a short ring is ignored (the above-mentioned document), or ignores an electric field analysis in consideration of a displacement current in spite of a high signal frequency of about 5 MHz or more handled by a rotary transformer. Since the analysis method is based on magnetic field analysis only (the above-mentioned document), it was not possible to calculate an accurate crosstalk.

Therefore, in the present invention, in consideration of the above-mentioned design problem of the rotary transformer, the crosstalk phenomenon is analyzed more accurately, and the number of turns of the fixed side coil and the rotating side coil, the fixed side magnetic core and the rotating magnetic core. It is an object of the present invention to provide a crosstalk phenomenon analysis device capable of easily optimizing the material properties of, the material properties and position of the short ring, and the like.

[0007]

A crosstalk phenomenon analyzing apparatus according to the present invention uses a plurality of basic equations representing physical characteristics of an analysis object including a magnetic member and a conductive member to analyze the crosstalk phenomenon in the analysis object. An apparatus for analysis, the characteristics of which are a data input unit for inputting the physical parameter to be analyzed, and a magnetic field calculation unit for calculating a crosstalk amount caused by a magnetic field phenomenon that is a factor of the crosstalk phenomenon, An electric field calculation unit that calculates a crosstalk amount caused by an electric field phenomenon that is another factor based on a calculation result of the magnetic field calculation unit, and a result output unit that outputs an analysis result of the magnetic field calculation unit and the electric field calculation unit. It has a point.

Preferably, the processing performed by the magnetic field calculation unit includes calculation of an eddy current generated in the conductive member due to a temporal change in magnetic flux density, and analysis of an electric circuit linked to a magnetic field phenomenon. The calculation unit calculates the induced electromotive force generated by the magnetic field phenomenon and affecting the electric field phenomenon from the current obtained as the calculation result of the magnetic field calculation unit and the parameters of the electric circuit, and using the calculation result, the crosstalk is calculated. Calculate the amount.

For example, the object to be analyzed is an electric circuit including a magnetic core, a short ring, a coil, a magnetic head, etc., the conductive member in which the eddy current is generated is a short ring, and the member in which the induced electromotive force is generated. Is a coil, it is possible to optimize the design parameters such as the number of turns of the coil, the material characteristics of the magnetic core, and the material characteristics of the short ring by using the present crosstalk phenomenon analyzing apparatus. In particular, it is suitable for analyzing a crosstalk phenomenon in a rotary transformer and optimizing each design parameter.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Before describing a preferred embodiment of the present invention, a method of calculating crosstalk caused by the influence of a magnetic field will be described. The basic equation of the magnetic field considering the eddy current is described by the following equation (Equation 1) (Nakada, Takahashi: "Finite Element Method of Electrical Engineering (Second Edition)", Morikita Publishing,
p14 (1986)).

[0011]

(Equation 1)

Here, μ is the magnetic permeability, A is the magnetic vector potential, J is the forced current density, σ is the electrical conductivity, and φ is the electric scalar potential. The above equation (Equation 1) is a basic equation of the magnetic field when the coil current is known, but in an actual rotary transformer, since a magnetic head and a resistor are connected as an external circuit, the current flowing through each coil is unknown, and the equation It cannot be analyzed only by (Equation 1). Accordingly, the magnetic flux density distribution can be obtained by applying Kirchhoff's second law shown in the following equation (Equation 2) to each coil and solving a simultaneous equation of Equations (Equation 1) and Equation (Equation 2). . Not only magnetic vector potential but also coil current can be solved at the same time (T.Nakata and N.Takahashi, "Direct Finite
Element Analysis of Flux and Current Distribution
s under Specified Condition ", IEEE Trans. on Mag
n., Vol.MAG-18, No.2, p325 (1982).

[0013]

(Equation 2)

Here, Ф is a flux linkage, R is a resistance, I is a current, and L is an inductance. Since the shape of the rotary transformer can be represented by an axially symmetric three-dimensional model, the equations (Equation 1) and (Equation 2) can be described by the following equation when discretized by the finite element method using a cylindrical coordinate system.

[0015]

(Equation 3)

[0016]

(Equation 4)

[0017]

(Equation 5)

[0018]

(Equation 6)

[0019]

(Equation 7)

[0020]

(Equation 8)

[0021]

(Equation 9)

[0022]

(Equation 10)

Here, NE is the total number of finite elements, NM is the number of coils, i = 1,..., Nu (nu is the number of unknown nodes), r0
(e) is the coordinates of the center of gravity of the element e, δije is the Kronecker delta, and △ (e) is the area of the element e. In addition, cje and dje are functions of the coordinates of the nodes, Vog is the applied voltage, Svg is the cross-sectional area, and ncg
Is the number of turns of the coil, Rg is the resistance of the external circuit, Lg is the inductance of the external circuit, and NG is the total number of elements in the coil.

Therefore, the crosstalk C due to the influence of the magnetic field
Rm is expressed by the following equation (Equation 1), where Im1 is a coil current having a transmission relationship and Im2 is a coil current that causes crosstalk.
Described in 1).

[0025]

[Equation 11]

Next, a method of calculating crosstalk caused by the influence of an electric field will be described. The basic equation of the electric field considering the electric conductivity and the dielectric constant is expressed by the following equation (Equation 12) (Okubo and Inui: "Electric field analysis of a field including volume and surface resistance", Journal of the Institute of Electrostatics, vol.8, No. 2, p93 (198
4)).

[0027]

(Equation 12)

Here, σ indicates the electric conductivity, and ε indicates the dielectric constant of the core or air. As in the case of magnetic field analysis, the shape of the rotary transformer can be expressed by an axisymmetric three-dimensional model.
If 2) is discretized by a finite element method using a cylindrical coordinate system, it can be described as the following equation (Equation 13).

[0029]

(Equation 13)

Here, φ is an electric scalar potential, S
Indicates a surface area. The displacement current, that is, the current Ie flowing through the coil under the influence of the electric field can be described by the following equation (Equation 14).

[0031]

[Equation 14]

Here, En indicates the vertical component of the electric field strength of the element forming the coil surface, and Sn indicates the surface area of the coil included in each element. Therefore, the crosstalk CRe due to the influence of the electric field is represented by the coil currents having a transmission relationship of Im1,
If the coil current that causes crosstalk is Ie,
It is obtained from the following equation (Equation 15).

[0033]

(Equation 15)

As shown in FIG. 1, the crosstalk phenomenon analyzing apparatus according to the present invention includes a data input unit 1 for reading various data, a magnetic field analyzing unit 2 for obtaining crosstalk generated by the influence of a magnetic field, Electric field analysis unit 3 for obtaining crosstalk generated by the influence of an electric field
And a result output unit 4 for outputting analysis result data obtained from the magnetic field analysis unit 2 and the electric field analysis unit 3.

The data input unit 1 is a shape which is a node and an element formed by dividing a region to be analyzed such as a fixed side and a rotating side core, a fixed side and a rotating side coil, a short ring, and air into a plurality of simple shapes. This is for inputting data, material characteristic data such as a core and a short ring, and electric circuit data such as inductance and resistance of a magnetic head outside the analysis region. For example, a keyboard can be used for inputting numerical data, and a mouse and a digitizer can be used for inputting shape data.

The magnetic field analysis unit 2 discretizes the magnetic field equation considering the eddy current and the Kirchhoff's second law equation considering the electric circuit, and uses the coupled equations (Equation 3) to (Equation 10). A matrix construction unit 5 for constructing a coefficient matrix;
A coil that solves simultaneous equations using a Gaussian elimination method or the like for the matrix created by the matrix construction unit 5 and obtains the current flowing through each of the fixed-side and rotating-side coils and the magnetic vector potential (magnetic flux density) in the analysis area. Based on the current and magnetic vector potential calculation unit 6 and the coil current obtained by the coil current and magnetic vector potential calculation unit 6, the crosstalk amount for obtaining the crosstalk amount due to the influence of the magnetic field by using Expression (Equation 11) is calculated. The calculation unit 7 includes a calculation unit 7 and a calculation unit 8 for calculating an induced electromotive force for taking into consideration the influence of the induced electromotive force generated by the magnetic field phenomenon on the electric field.

The electric field analysis unit 3 sets an induced electromotive force 9 for processing the induced electromotive force calculated by the induced electromotive force calculation unit 8 as a fixed boundary condition of the fixed-side and rotating-side coils.
And a matrix constructing unit 10 for discretizing the electric field equation and constructing a coefficient matrix using the equation (Equation 13), and solving a simultaneous equation using the Gaussian elimination method or the like for the matrix created by the matrix constructing unit 10, An electric scalar potential calculator 11 for obtaining an electric scalar potential (E = -gradφ) capable of obtaining the electric field strength in the analysis area, and an electric field strength on the coil surface obtained from the electric scalar potential calculator 11. As a result, a coil current calculation unit 12 for obtaining a coil current using Expression (Equation 14) and a coil current obtained from the coil current calculation unit 12 are applied to Expression (Equation 15) to obtain a cross generated by the influence of an electric field. And a crosstalk calculator 13 for obtaining a talk.

The result output 4 includes a coil current and magnetic vector potential calculator 6 in the magnetic field analyzer 2, a crosstalk calculator 7, a coil current calculator 12 in the electric field analyzer 3, and a crosstalk calculator. Crosstalk due to the influence of the magnetic and electric fields obtained by the calculation unit 13,
A device that outputs data such as a magnetic flux density distribution and an electric field distribution in an analysis target area, a current flowing through each coil, and a printer, a display, a plotter, or the like is used.

[0039]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the above-described crosstalk analysis apparatus according to the present invention is applied to the design of a circumferentially opposed rotary transformer of a VTR (video tape recording apparatus) will be described below.
FIG. 4 is a cross-sectional view of the circumferential facing type rotary transformer used for the evaluation.
FIG. 4A shows an enlarged view of the portion A in FIG. Also,
FIG. 5 shows an equivalent circuit including a peripheral circuit.

The rotary transformer of this embodiment is for ten channels, the outer core functions as a fixed part, the inner core functions as a rotating part, and a short ring (SR) is installed between each channel of the outer core. The relative permeability μr of the core made of Ni—Zn ferrite is 700, and the relative permittivity εr is 10. The number of turns of the stationary coil is 9 turns for each channel, and the number of turns of the rotating coil is 5 turns for each channel. The magnetic head connected to each of the rotating coils has an inductance of 1.8 μH, and the short ring made of soft copper has a conductivity of 5.82 × 10 ⁷ S / m.

In the analysis in this embodiment, the fixed-side ch2 coil, which indicates the recording process of the VTR, and the rotating-side coil c
Assuming that a signal is being transmitted to h2, an alternating current of 2 V was applied to the fixed coil ch2. Then, the crosstalk between the channels is reduced to the rotation side coil ch2 and the same channel ch.
The rating was 3. The evaluated signal frequency is 1 to 10 MHz. The number of nodes in the division diagram of the magnetic field analysis was 2071 and the number of elements was 4112. As a representative example of the analysis result, FIGS. 6A and 6B show a magnetic flux distribution (equipotential diagram) when the signal frequency is 5 MHz. FIG. 6A shows a case where the short ring is ignored, and FIG. 6B shows a case where the short ring is considered. 6 (a) and 6 (b)
From this, it was confirmed that the short ring was effective in reducing the crosstalk due to the influence of the magnetic field.

The number of nodes in the electric field analysis division diagram is 204
9, the number of elements was 4018. As a representative example of the electric field analysis result, an equipotential diagram when the signal frequency is 5 MHz is shown in FIG.
Shown in FIG. 7 shows that the influence of the electric field extends beyond the short ring to the rotating coil ch3. The crosstalk characteristics when the signal frequency is 1 to 10 MHz are shown in FIG. In the figure, the crosstalk due to the magnetic field is represented by ηm, and the crosstalk due to the electric field is represented by ηe. From the figure, it can be seen that crosstalk due to the effect of the magnetic field is dominant at low frequencies, but conversely, crosstalk due to the effect of the electric field is dominant at high frequencies. As described above, according to the present analysis apparatus, the crosstalk can be quantitatively and accurately evaluated for each of the magnetic field and the electric field, so that compared with the case of an experiment (tri-and-error) in which it is difficult to grasp the phenomenon, Optimization design for reducing crosstalk in the rotary transformer can be performed more efficiently.

Next, the crosstalk analysis apparatus according to the present invention is applied to the design of a face-to-face type rotary transformer of a VTR,
An example will be described in which the effects of various design parameters of the rotary transformer, such as the magnetic permeability and dielectric constant of the core, the conductivity of the short ring, and the number of turns of the coil on the crosstalk are described. FIG. 9 shows a cross section of an analysis model of the surface-facing rotary transformer for VTR used in the study, and FIG. 10 shows an equivalent circuit including an external circuit.

The rotary transformer of this embodiment is for four channels, and the short ring is provided between the rotary coil ch2 and the rotary coil ch3. The number of turns of the fixed side coil is 6 turns per channel, and the number of turns of the rotating side coil is 3 turns per channel. Other parameters are the same as those of the above-described circumferential facing rotary transformer. A 2V signal was applied to the ch2 coil, and crosstalk due to various design parameters was evaluated.

FIG. 11 shows an analysis result of crosstalk characteristics when the relative magnetic permeability μr of the core is changed. As μr increases, the crosstalk ηm due to the influence of the magnetic field slightly decreases. This is because, as μr increases, the current Ir2 of the rotating side coil ch2 tends to increase, whereas the current Ir3 causing crosstalk decreases. Current I
The reason for the increase in r2 is that the magnetic flux density in the core increases as a whole with the increase in magnetic permeability, and the current induced in the rotating coil ch2 also increases. This is because the effect of the reaction magnetic field due to the eddy current flowing through the short ring becomes more remarkable as μr increases.

The crosstalk due to the influence of the electric field is substantially constant without depending on the magnetic permeability. This is because the magnetic permeability is not included in the basic equation of the electric field. The crosstalk ηe due to the influence of the electric field is considerably larger than the crosstalk ηm due to the influence of the magnetic field. Therefore, it can be seen that even if the magnetic permeability of the core is increased, the crosstalk due to the influence of the electric field is dominant, so that improvement in the crosstalk characteristics cannot be expected.

FIG. 12 shows the crosstalk characteristics when the relative permittivity εr of the core is changed. The crosstalk ηm due to the influence of the magnetic field does not depend on εr and is constant. This is because εr is not included in the basic equation of the magnetic field.
Next, as the relative permittivity εr of the core increases, the crosstalk ηe due to the influence of the electric field shows a sharp increasing tendency,
It turns out that there is a problem in device performance. this is,
As the relative permittivity εr of the core increases, the relative permittivity εr of the core increases.
Not only that, the electric field strength En shown in the equation (Equation 14) also increases, so that the current Ir3 of the rotating coil ch3 increases. When the crosstalk characteristics due to the magnetic field and the electric field are compared, the effect of the magnetic field becomes dominant when the relative permittivity εr is extremely small, but the effect of the electric field becomes dominant in the ordinary core material. From these facts, the relative dielectric constant of the core is an important factor for improving the crosstalk characteristics when designing a rotary transformer, and it can be expected that significant improvement in crosstalk can be expected by using a material with a low relative dielectric constant. Recognize.

FIG. 13 shows crosstalk characteristics when the conductivity σ of the short ring is changed. When the short ring is installed (σ ≠ 0) and when it is not installed (σ = 0), the crosstalk ηm due to the influence of the magnetic field shows a large difference of about 30 dB. This is because the current Ir2 of the rotating coil ch2 is constant irrespective of the presence or absence of the show ring (that is, the presence or absence of the show ring does not affect the transmission characteristics). This is because there is a large difference depending on the presence or absence. This means that when the short ring is installed, the reaction magnetic field due to the eddy current is functioning sufficiently, indicating that the short ring is an inevitable component for reducing crosstalk. . Also, when the short ring is provided, it can be seen that the crosstalk ηm is substantially constant even when the conductivity changes.
From these facts, it is judged that, even if the conductivity slightly changes, the influence on the crosstalk characteristic is small, and therefore, as the material thereof, inexpensive and easy-to-work soft copper is sufficient.

FIG. 14 shows the crosstalk characteristics when the number of turns n1 of the rotating coil is changed. Here, the turn ratio (n1: n2) between the rotating side and the fixed side was set to be 1: 2 for unitary comparison. The crosstalk ηm due to the influence of the magnetic field tends to decrease as the number of coil turns increases. This is because the influence of the short ring is relatively large in the range where n1 is small. Therefore, even if n1 is increased, the inductance of the rotating coil ch3 increases, that is, the current Ir3 hardly decreases. This is because the inductance is substantially determined by the number of turns, and Ir3 decreases as n1 increases. next,
The crosstalk ηe due to the effect of the electric field tends to increase as the number of coil turns increases, that is, the performance tends to deteriorate. This is due to an increase in the current Ir3, which is caused by an increase in the surface area S with an increase in the number of turns of the coil. From the above, it can be seen that the influence of the magnetic field is dominant when the number of coil turns is small, and that the effect of the electric field is dominant when the number of coil turns is large. By using the talk phenomenon analyzer, optimization of the number of coil turns can be easily realized.

In the above embodiment, the rotary transformer for a rotary head of a VTR has been described as an example. However, the present invention is not limited to this, and has a rotary head such as a DDS (Digital Data Streamer). The present invention can also be applied to a rotary transformer of another magnetic recording / reproducing device.

The magnetic field analysis unit and the electric field analysis unit in the crosstalk phenomenon analysis apparatus according to the present invention are usually realized by a computer and its software, but may be realized by dedicated hardware or firmware. Furthermore, if these are configured by a neural network, it will be possible to more generally optimize the rotary transformer by learning the output results. The method of numerical analysis is not limited to analysis by the finite element method, but may be a difference method, a boundary element method, or the like.

[0052]

As described above, by using the crosstalk phenomenon analysis apparatus of the present invention, it is possible to optimize the design parameters such as the number of coil turns, the dielectric constant of the material, and the magnetic permeability for producing a rotary transformer having less crosstalk. Therefore, it becomes easy and quick to manufacture a rotary transformer with high performance and low cost.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing an embodiment of a crosstalk phenomenon analysis device according to the present invention.

FIG. 2 is a sectional view showing the structure of a rotary transformer.

FIG. 3 is an equivalent circuit diagram of a rotary transformer including a peripheral electric circuit.

FIG. 4 is a cross-sectional view showing the structure of a circumferentially opposed rotary transformer used in an example of analysis by the crosstalk phenomenon analyzer of the present invention.

FIG. 5 is an equivalent circuit diagram including a peripheral electric circuit of the circumferentially opposed rotary transformer of FIG. 4;

6 is an equipotential diagram showing a magnetic flux density distribution as an example of an analysis output of the circumferentially opposed rotary transformer in FIG. 4;

7 is an equipotential diagram showing an electric field distribution as an analysis output example of the circumferentially opposed rotary transformer in FIG. 4;

FIG. 8 is a cross-talk characteristic diagram of a magnetic field and an electric field, which is an analysis output example of the circumferentially opposed rotary transformer of FIG.

FIG. 9 is a cross-sectional view showing the structure of a face-to-face rotary transformer used in an analysis example by the crosstalk phenomenon analysis apparatus of the present invention.

10 is an equivalent circuit diagram including a peripheral electric circuit of the surface-facing rotary transformer in FIG. 9;

FIG. 11 is a characteristic diagram showing a relationship between relative permeability and crosstalk of a magnetic core, which is an analysis output example of the surface-opposing rotary transformer of FIG. 9.

12 is a characteristic diagram showing the relationship between the relative dielectric constant of a magnetic core and crosstalk, which is an example of the analysis output of the surface-facing rotary transformer in FIG. 9;

13 is a characteristic diagram showing the relationship between the conductivity of a short ring and crosstalk, which is an example of the analysis output of the surface-facing rotary transformer in FIG. 9;

FIG. 14 is a characteristic diagram showing a relationship between the number of coil turns and crosstalk, which is an example of an analysis output of the surface-facing rotary transformer in FIG. 9;

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Yasuo Yokota 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd.

Claims (6)

[Claims] 1. An apparatus for analyzing a crosstalk phenomenon in an analysis target using a plurality of basic equations representing physical characteristics of the analysis target including a magnetic member and a conductive member, wherein the physical property of the analysis target is A data input unit for inputting parameters, a magnetic field calculation unit for calculating a crosstalk amount caused by a magnetic field phenomenon which is one factor of the crosstalk phenomenon, and a crosstalk amount caused by an electric field phenomenon which is another factor. A crosstalk phenomenon analysis apparatus comprising: an electric field calculation unit that calculates based on the calculation result of (1); and a result output unit that outputs analysis results of the magnetic field calculation unit and the electric field calculation unit. 2. The processing performed by the magnetic field calculation unit includes calculation of an eddy current generated in the conductive member due to a temporal change of a magnetic flux density, and analysis of an electric circuit linked to a magnetic field phenomenon. The calculation unit calculates the induced electromotive force generated by the magnetic field phenomenon and affecting the electric field phenomenon from the current obtained as the calculation result of the magnetic field calculation unit and the parameters of the electric circuit, and using the calculation result, the crosstalk is calculated. The crosstalk analysis apparatus according to claim 1, wherein the amount is calculated. 3. The object to be analyzed is an electric circuit including a magnetic core, a short ring, a coil, a magnetic head, and the like, a conductive member in which the eddy current is generated is a short ring, and a member in which the induced electromotive force is generated. Is a coil.
The crosstalk phenomenon analysis device described. 4. A rotary transformer using a coil having a number of turns optimized by using the crosstalk phenomenon analyzing apparatus according to claim 3. 5. A rotary transformer using a short ring having material characteristics optimized using the crosstalk phenomenon analysis apparatus according to claim 3. 6. A rotary transformer using a magnetic core having a material characteristic and shape of a dielectric constant and a magnetic permeability optimized by using the crosstalk phenomenon analyzing apparatus according to claim 3.