JPS6052661B2 - magnetic generator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is a so-called frequency power generation system for generating a speed signal necessary for displaying the rotational speed of a rotating body with high precision or controlling the rotational speed of a rotating body with high precision. This relates to a magnetic power generation device suitable for use in machines, etc., and in particular, it effectively reduces noise voltage generated by the action of an external magnetomotive member that generates changing magnetic flux in addition to the frequency signal voltage proportional to the rotational speed of a rotating body. It was designed to reduce this to .

FIG. 1 is a front sectional view showing the configuration of a frequency generator conventionally used for detecting the rotational speed of a rotating body.

In FIG. 1, a rotatable rotor 1 made of soft magnetic material
0 is a toothed portion 12 made of soft magnetic material on the outer periphery of the rotor 10.
have. Furthermore, a rotor shaft 14 is fixed to the center of the rotor 10, and a bearing 1 is fixed to a substrate 16.
It is rotatably supported by 8. The above rotor 10
Two magnetic detection members 2 having the same configuration are located near the outer periphery of the
0 and Yn are arranged. The magnetic detection member 20
and Yn are the first fixing members 22 each made of a soft magnetic material.
7, a bias magnet 24, Iτ, a detection coil 26, In, and a second fixing member 28 made of a soft magnetic material and Y1. The first fixing member 22 and Yn each have a toothed portion 30 and a toothed portion, and the toothed portion 30 and the toothed portion are opposed to the toothed portion 12 of the rotor 10 with a required gap. Further, each of the second fixing members 28 and Nn is opposed to the toothed portion 12 of the rotor 10 with a required gap, and
is arranged so as to face the fixing member 22 and YY. The first fixing members 22 and 7Y, the second fixing members 28 and Yn, and the rotor 10 form one closed magnetic circuit, and the bias magnet 24 and Ni are arranged in the closed magnetic circuit. First fixing member 22
and YY tooth profile 30 and rotor 10.
The bias magnet is disposed between the first fixing members 22 and 11 and the second fixing members 28 and 7n as an internal magnetomotive member for generating magnetic flux passing through the toothed portion 12 of the magnet. 24 and the magnetic flux generated from Y1.
The detection coils 26 and 7n are wound around the bias magnet 24 and nτ so as to be interlinked with each other. On the other hand, a motor 32 serving as a rotational drive source for the rotor 10 is disposed on the substrate 16, and a rotating shaft 34 of the motor 32 is rotationally supported by a bearing 36 fixed to the substrate 16.

Pulleys 38 and 40 are attached to the rotating shaft 34 of the motor 32 and the rotor shaft 14, respectively, and the rotational force of the motor 32 is transmitted to the rotor 10 via a belt 42. Next, the generation mechanism of the frequency signal voltage will be explained. The rotor 10 rotates in accordance with the rotation of the motor 32, and the toothed part 12 provided on the outer periphery of the rotor 10, the toothed part 30 of the fixed members 22 and 77, and the toothed part 30 of the fixed members 22 and 77. Since the opposing state between the two changes as the rotor 10 rotates, the magnetic resistance between the toothed portion 12 and the toothed portion 30 and Nn changes as the rotor 10 rotates.

Therefore, it is generated from the bias magnet 24 and Iτ, and the toothed portion 30 of the first fixing member and the
The magnitude of the magnetic flux that passes through the toothed portion 12 of the rotor 10 and interlinks with the detection coil 26 and In also depends on the rotor 1.
0, a frequency signal voltage corresponding to the number of toothed portions 12 of the rotor 10 and the rotational speed of the rotor 10 is generated in the detection coil 26 and Yn.
When the frequency signal voltage obtained in this manner is used, for example, as a speed signal for controlling the rotational speed of the rotor 10, what is important is the accuracy of the frequency signal voltage, so-called S/N ratio. However, when the motor 32 serving as the drive source for the rotor 10 is installed close to the rotor, for example, when the motor 32 is switched, a changing magnetic flux generated from its drive coil acts on the magnetic detection members 20 and 7n, causing the magnetic flux to change. A noise voltage not directly related to the rotation of the rotor 10 may be generated in the magnetic detection member 20 and Nn. That is, if the motor 32 is located outside the closed magnetic circuit, the magnetic detection member 2
It acts as an external magnetomotive member that generates a noise voltage other than the frequency signal voltage at 0 and In. Here, when two magnetic detection members 20 and Nn are installed as shown in FIG. can.

FIG. 2 shows that the bias magnet 24 and Iτ and the detection coil 26 and Yn wound around the bias magnet 24 and Iτ are taken out of the frequency power generation device shown in FIG. This figure shows an example of the connection between the detection coil 26 and Yn for canceling the noise voltage when interlinking in the same direction as Yn. The above detection coil 26 and Y
Both windings are left-handed and wound with the same number of turns, and the terminals 46 and 50 at the ends are connected when viewed from the direction of movement of the disturbance magnetic flux. Here, as shown in Figure 2, the disturbance magnetic flux φN
When the same number of terminals 46 and 50 are connected to both the detection coils 26 and In, the detection coils 26 and 7n have terminals 46 and 50 connected to each other.
are at the same common potential, and the same induced voltage is generated at the terminals 44 and 48 with respect to the terminals 46 and 50, respectively. Therefore, no induced voltage is generated across terminals 52 and 54, which connect terminals 44 and 48.
In addition, in the above connection, by arranging the bias magnet 24 and Yτ with opposite polarities, the terminal 5
The signal voltages generated between 2 and 54 are combined in phase. As described above, the conventional example shown here has a structure in which noise can basically be canceled by providing two magnetic detection members 20 and In, and the above-mentioned disturbance magnetic flux is transmitted to the detection coil 26 and Yn. Even when the detection coil 26 and Yn are interlinked in the opposite direction,
By changing the wiring connections and the polarities of the bias magnet 24 and iτ, signal voltages can be synthesized and noise voltages can be canceled.

However, in reality, the above-described noise canceling effect often does not work effectively.

This is because, for example, the magnetic detection members 20 and 7n and the external magnetomotive member 32 are not in symmetrical positions due to their construction, or even if they are in a symmetrical position, they are not maintained accurately, or Magnetic resistance between the magnetic path between the external magnetomotive member 32, which is a source of noise, and the magnetic detection member 20 and Yn, such as when there is a member that may be structurally asymmetric, such as a pin or lever made of a magnetic material. are different,
Therefore, the detection coil 26 and I
The magnitudes of the disturbance magnetic fluxes acting on n are not equal to each other,
This is because there is a difference in the magnitude of the noise voltages generated in the detection coils 26 and 7n, so that some noise voltage remains even after the noise voltages generated in the detection coils 26 and 7n are cancelled. .
To explain in more detail what I described qualitatively above,
As is well known, the magnitude of the noise voltage is determined by the magnitude of the noise voltage between the external magnetomotive member 32 and the detection coil 26 when the motor 32, which is an external magnetomotive member, is regarded as one coil that generates disturbance magnetic flux.
It is determined by the magnitude of the mutual inductance between Ni and Ni. In general, the self-inductance L of two coils
The following (1) exists between l, L2 and mutual inductance M.
There is a relationship like a formula. Here, k is the coupling coefficient,
This is a coefficient given by the distance between the two coils of self-inductance L1 and L2, the inherent magnetic permeability of the material existing between them, and the size of that material, and this k is the distance between the two coils of self-inductance L1 and L2. This is a measure to determine the degree of magnetic coupling between coils.

Therefore, when a member made of a soft magnetic material with high magnetic permeability exists between the external magnetomotive member 32 and the detection coil 26 and Nn as in the case of this conventional example, or when the external magnetomotive member 32 and If the detection coil 26 and Yn are not in a symmetrical positional relationship, it can be considered that a difference occurs in the coupling coefficient, and as a result, a difference occurs in the generated noise voltage. As mentioned above, this conventional example basically has a structure that can cancel the noise voltage, but in reality, the difference in the coupling coefficient causes a difference in the magnitude of the noise voltage generated in the detection coil 26 and In. Therefore, even if a configuration is adopted to cancel the noise voltage, the noise voltage still remains, and the ratio of the signal voltage to the noise voltage, so-called S
This method has the disadvantage that only a signal voltage of /N· can be obtained, and rotation detection cannot be performed with high precision.

The present invention aims to reduce the residual noise voltage after canceling the noise voltage generated in the detection coil 26 and Ni, and to reduce the noise generated in each of the detection coil 26 and Ni in order to enable highly accurate rotation detection. The present invention attempts to eliminate the above-mentioned drawbacks of the conventional art by providing an adjusting means that can match the voltage level.

FIG. 3 shows the connection between the detection coils 26 and 1n and the variable resistor 56 of the frequency generator shown in FIG. FIG. 2 is a wiring diagram schematically showing the state of FIG.

To explain this, in this embodiment, the detection coil 26 and Y
This is intended to match the level of the noise voltage by directly changing the output of the noise voltage generated at n, and among the noise voltages generated at the detection coil 26 and In, the variable voltage is applied to the detection coil side where the higher noise voltage occurs. The resistor 56 is connected to match the level of the noise voltage generated in both the detection coils 26 and Nn, thereby reducing the residual noise voltage.
6 and Yn by dividing and adjusting the magnitude of the noise voltage generated in the detection coil 26. Here, there are some points to keep in mind when implementing this embodiment.

This is because, on the side of the connected detection coil 26, a phase difference occurs between the voltage and current generated in the detection coil 26. Since the output of the noise voltage is obtained as the voltage generated between the terminals of the variable resistor 56 in the circuit formed by the detection coil 26 having an inductive reactance and the variable resistor 56, the noise output voltage is obtained by the detection coil In alone. It has a phase difference with the noise voltage generated between the terminals. In contrast, a variable resistor 56 having a resistance value sufficiently larger than the inductive reactance of the detection coil 26 is provided, and the resistance value of the variable resistor 56 is made sufficiently large with respect to the inductive reactance of the detection coil 26. This makes it possible to reduce the influence of the inductive reactance, thereby reducing the noise voltage generated in the detection coil 26 whose size is adjusted by the variable resistor 56 and the noise voltage generated in the detection coil 7n. can be sufficiently canceled, and as a result, a signal voltage with a good S/N ratio can be obtained, making it possible to detect rotation with high precision. Next, other embodiments of the present invention will be described.

FIG. 4 is a front sectional view showing another embodiment of the present invention.
As mentioned above, in the conventional example shown in Figure 1. The disturbance magnetic flux generated from the external magnetomotive member 32 causes a difference in the magnitude of the noise voltage generated in the magnetic detection member 20 and the detection coils 26 and 71 included in In. Since the distances between the magnetic detection member 20 and In are different, the magnitude of magnetic resistance between the external magnetomotive member 32 and the magnetic detection member 20 and In is different, and the magnitude of the magnetic coupling coefficient described above is different. This is because they are different. Here, the external magnetomotive member 32 and the magnetic detection member 2
The difference in magnetic resistance values between 0 and Nn is due to the fact that the rotor 10 made of a soft magnetic material is present between the external magnetomotive member 32 and the magnetic detection member 20, and therefore when the rotor 10 is not present. Although it is smaller than that, in many cases, the magnitudes of the noise voltages induced in each of the detection coils 26 and Yn included in the magnetic detection members 20 and 7n cannot be made sufficiently equal.

Therefore, in this embodiment, as shown in FIG.
In adjusting the magnitude of magnetic resistance between the two magnetic detection members 20 and In and the external magnetomotive member 32, the degree of magnetic coupling between the two magnetic detection members 20 and In and the external magnetomotive member 32 is adjusted. - A magnetic coupling member 58 made of a soft magnetic material is installed between the external magnetomotive member 32 and the two magnetic detection members 20 and In in order to equalize the coupling coefficients. In FIG. 4, the magnetic coupling member 58 is installed so as to extend from the lower position of the external magnetomotive member 32 to the lower position of the magnetic detection member/material In, and then to the lower position of the magnetic detection member 20. As can be seen from the above description, this magnetic coupling member 58 connects the external magnetomotive member 32 and the external magnetomotive member 3.
This reduces the magnetic resistance between the magnetic detection member 20 and the magnetic detection member 20, which is located a long distance away from the magnetic detection member 20, and increases the degree of magnetic coupling between the two. Here, since the magnetic coupling member 58 also passes through the lower position of the magnetic detection member Nn, the degree of magnetic coupling between the magnetic detection member In and the external magnetomotive member 32 is also increased at the same time. 4, the gap between the magnetic coupling member 58 and the magnetic detection member 20 is made larger than the gap between the magnetic coupling member 58 and the magnetic detection member 20. 58 can be made smaller than that of the magnetic detecting member 20, and the magnetic detecting member 20 can be made smaller relative to the degree of magnetic coupling between the magnetic detecting member Yn and the external magnetomotive member 32.
The degree of magnetic coupling between the external magnetomotive member 32 and the external magnetomotive member 32 can be increased. Therefore, the magnetic detection members 20 and 7n described above
By appropriately providing a gap between the magnetic detection member 20 and the magnetic coupling member 58, the degrees of magnetic coupling between the magnetic detection member 20 and In and the external magnetomotive member 32 can be made approximately equal, and as a result, the magnetic detection member 20 and Yσ number? The magnitude of the noise voltage generated in the outgoing coil 26 and Nn can be made substantially equal, and the noise voltage can be effectively reduced by coupling the detection coils 26 and 7n. Note that the explanation of the same parts in FIG. 4 as those shown in FIG. 1 is omitted.

As described above, in this embodiment, by using a member made of soft magnetic material as the adjusting means, a magnetic power generation device that is advantageous in terms of cost and mass production can be obtained.

Next, an embodiment in which the present invention is applied to a planar brushless motor will be described.

FIG. 5 is a front sectional view showing the structure of a planar facing type brushless x-motor, and FIG. 6 is a plan view of a stator portion of the same motor, which will be described later.

5 and 6, a rotor magnet 62 having an annular shape with six N and S poles magnetized is fixed to a rotatable rotor 60, and the rotor magnet 62 is magnetized. The rotor shaft 68 is mounted on the stator member 72 held so as to face the surface 64 at a required distance.
Four drive coils 66a, 66b, 66c, and 66d are arranged approximately on the circumference with the center at a required interval from each other, and the magnetic action between these drive coils and the magnetized pole 64 of the rotor magnet 62 is The rotor 60 is arranged so as to be rotationally driven. In addition, the stator member 7
2 has a thrust bearing 70 for supporting the load of the rotor 60 in the thrust direction, and a position signal for detecting the rotational position of the rotor 60 and sequentially switching the current flowing through the drive coils 66a, 66b, 66c, and 66d. Hall elements 74a and 74b are attached to generate the light.

The two magnetic detection members 20 and Yn are arranged at substantially symmetrical positions with respect to the rotor axis 68 with a required gap from the toothed portion 12 provided on the outer periphery of the rotor 60, as in the conventional example shown in FIG. ing. By the way, it is well known that when driving the motor to rotate, it is necessary to sequentially switch the current flowing through the drive coils 66a, 66b, 66c, and 66d in accordance with the rotational phase of the rotor 60.
At the time of this current switching, the drive coils 66a, 66b, 6
Although changing magnetic flux is generated at 6c and 66d, this changing magnetic flux acts as a disturbance magnetic flux to the magnetic detection member 20 and In, regardless of the movement of the toothed portion 12 of the rotor 60.

In other words, when switching the current, the drive coils 66a, 66b
, 66c, and 66d acts on the magnetic detection member 20 and Yn as a disturbance magnetic flux, and in addition to the frequency signal voltage generated in accordance with the rotation of the rotor 60, the magnetic flux generated by the magnetic detection member 20 and Yn is affected by the frequency signal voltage. This will generate extraneous noise voltages. As mentioned above, the problem of the drive coil acting as an external magnetomotive member and generating noise voltage has been solved as motors have become smaller in recent years, and the drive coils 66a, 66b, 66c, 66d and the magnetic detection member 20 and This has become a serious problem as In and In are placed closer to each other.

Also, in this embodiment, as in the case of the conventional example, the magnetic detection member 20 and In are configured to cancel the generated noise voltage, but as explained above, the drive coils 66a, 66b, 66c , 66d and the magnetic detection member 20 and In, a member made of soft magnetic material such as the stator member is located between the magnetic detection member 20 and
or when levers, pins, etc. made of soft magnetic material are provided close to the magnetic detection members 20 and 7n when this motor is used in a tape recorder, etc. Now, the drive coil 66a
, 66b, 66c, and 66d and the magnetic detection member 20 and Yn, and the magnitude of the noise voltage generated in each of the detection coils 26 and Yn is different. A residual noise voltage will still be generated even after cancellation by 26 and 7n.
In the C motor, as described above, the drive coils 66a, 66b, 66c, and 66d, which act as external magnetomotive members, are mounted on the stator member 72 so as to face the lower surface of the rotor 60.
The rotor 60 connects to the magnetic detection member 20 via the toothed portion 12 provided on its outer periphery.
and In, the drive coil 766
It is conceivable that the disturbance magnetic flux generated from a, 66b, 66c, and 66d acts on the magnetic detection member 20 and Yh through a magnetic path that includes the stator member 72 and the rotor 60. That is, in the motor shown in FIG. 5, the stator member 72 forms a magnetic coupling that magnetically couples the drive coils 66a, 66b, 66c, and 66d as external magnetomotive members to the magnetic detection member 20 and In. Therefore, the stator member 72 is connected to the drive coil 66a, which is an external magnetomotive member.
, 66b, 66c, and 66d, and the magnetic detection member 20 and In can be used as adjustment members for adjusting the degree of magnetic coupling. For example, in the embodiment shown in FIGS. 5 and 6, protrusions 76 and 78 are formed on the stator member 72 at positions facing the magnetic detection members 20 and 7n.

In Fig. 6, the parts originally required as stator members are 2.
As shown by the dotted chain line, it has a substantially circular outline centered on the rotation axis 68 of the rotor 60. The convex portions 76 and 78 are additional members protruding from the shape indicated by the two-dot chain line, and are provided so that the shapes of the portions facing the magnetic detection member 20 and In differ from each other. The convex portions 76 and 78 are connected to the drive coils 66a, 66b, 66c, and 66d, which are external magnetomotive members, and the magnetic detection member 2.
0 and In, respectively, and the detection coil 26 and In included in the magnetic detection member 20 and Yn have the above-described magnetic coupling degree determined by the convex portions 76 and 78, etc. Drive coil 66a, 6
A noise voltage is generated depending on the degree of magnetic coupling with 6b, 66c, and 66d. Here, in this embodiment, the convex portions 76 and 78 are arranged so that the degrees of magnetic coupling between the drive coils 66a, 66b, 66c, and 66d, which are the external magnetomotive members, and the magnetic detection member 20 and Yn are equal to each other. By adjusting the area and shape, the magnitude of the noise voltage generated in the two detection coils 26 and In is made equal to each other, and the noise voltage is reliably canceled by the coupling of the two detection coils 26 and Yn. It was designed to do so. Note that in a state where the convex portions 76 and 78 as shown by the two-dot chain lines in FIG.
If the degrees of magnetic coupling with the magnetic coupling elements b, 66c, and 66d are equal, it is naturally unnecessary to provide the convex portion.

By the way, in reality, the drive coil 66 for the two magnetic detection members 20 and 7h as described above is used without providing a convex portion.
It is extremely rare that the magnetic coupling degrees of a, 66b, 66c, and 66d are equal to each other, and the magnetic detection members 20 and Yn and the drive coils 66a, 66b, 66c, and 66d have symmetry in their geometric shapes. Even when it has, the degree of magnetic coupling is asymmetrical, and the degree of magnetic coupling is usually different.

Therefore, the degree of magnetic coupling can be determined by measuring the degree of magnetic coupling between the two magnetic detection members 20.
and 7n so that the convex portions 7 are equal to each other.
If 6 and 78 are to be provided, their areas and shapes will be geometrically different from each other. Further, the two convex portions 76 and 78 are connected to the two magnetic detection members 20 and 1. As a special case in which the areas and shapes of the portions facing n are different from each other, one of the protrusions, for example, the protrusion 78, is removed, and only the other protrusion 76 is provided, and the area and shape of the protrusion 76 are changed. By adjusting the degree of magnetic coupling, the two magnetic detection members 20 and In may be made to have the same degree of magnetic coupling. Here, when using the magnetic coupling member as an adjustment means as described above, the drive coils 66a, 66 which are external magnetomotive members
It is convenient that the magnetic detection member 20 and In are strongly magnetically coupled to each other, since the degree of change in the degree of magnetic coupling by the adjusting means is large.

In the configuration shown in FIG. 5, the presence of the second fixed members 28 and 7n, which act as one of the members forming a closed magnetic circuit for guiding the magnetic flux for generating the frequency signal voltage, is due to the drive coil 66a, This has the effect of increasing the degree of magnetic coupling between the magnetic detection members 20 and 7n and the magnetic detection members 66b, 66c, and 66d.

In such a configuration, by providing the protrusion 76 on the stator member 72 as described above, the drive coil 66
The degree of magnetic coupling between a, 66b, 66c, and 66d and the magnetic detection member 20 and In can be changed, but in this case, as mentioned earlier, the convex portion 76 is connected to the second fixing member 28. Needless to say, it is convenient to provide the second fixing member 28 in the opposing portion in close proximity to the second fixing member 28 in order to greatly change the degree of magnetic coupling. As mentioned above,
The present invention provides a magnetic power generation device constituted by a rotatable rotor and two or more magnetic detection members that generate a frequency signal voltage proportional to the rotational speed of the rotor, in which the action of at least one external magnetomotive member is provided. According to the present invention, an adjustment means is provided for changing the magnitude of noise voltage other than the frequency signal voltage generated in the magnetic detection member.According to the present invention, the noise voltage is reduced and the frequency signal with a good S/N It is possible to obtain voltage, and its effects are great.

[Brief explanation of drawings]

Fig. 1 is a front sectional view showing the configuration of a conventional example, Fig. 2 is a wiring diagram of the same detection coil, Fig. 3 is a wiring diagram of a detection coil incorporating a variable resistor as an embodiment of the present invention, and Fig. 4 The figure is a front cross-sectional view showing another embodiment of the present invention, FIG. 5 is a front cross-sectional view when the present invention is applied to a flat opposed type brushless motor, and FIG. 6 is a plan view of the stator portion of the same. DESCRIPTION OF SYMBOLS 10... Rotor, 12... Rotor tooth profile, 20, In... Magnetic detection member, 22, YY...
...First fixing member, 24, Y-type...Bias magnet, 26,nn...Detection coil, 2
8, in...second fixed member, 32...motor, 56...variable resistor, 58...adjustment member, 62...rotor magnet, 66a ,66b
, 66c, 66d... Drive coil, 72...
... Stator member, 76, 78... Convex portion of the stator member.

Claims (1)

[Claims] 1. A rotatable rotor, two or more magnetic detection members each forming a closed magnetic circuit including the rotor, and a magnetic detection member included in the magnetic detection member for supplying magnetic flux to the closed magnetic circuit. and an internal magnetomotive member provided in the closed magnetic circuit, and the magnitude of the magnetic flux supplied from the internal magnetomotive member to the closed magnetic circuit changes as the rotor rotates. Therefore, the magnetic power generation device is configured to generate a frequency signal voltage in the two or more magnetic detection members according to the rotational speed of the rotor, and the magnetic power generation device is configured to generate a frequency signal voltage according to the rotational speed of the rotor from an external magnetomotive member existing outside the closed magnetic circuit. Magnetic power generation characterized in that an adjustment means is provided for changing the magnitude of at least one noise voltage among the noise voltages generated in addition to the frequency signal voltage by acting on the magnetic detection member with respect to other noise voltages. Device. 2. The two or more magnetic detection members each include a detection coil that generates a frequency signal voltage, and an electrical resistance member is connected to at least one output terminal of the two or more detection coils, and the electrical resistance member The magnetic power generation device according to claim 1, characterized in that the adjusting means is: . 3. Equipped with a magnetic coupling member for changing the magnitude of magnetic flux acting from the external magnetomotive member on the magnetic detection member by changing the magnetic resistance between the external magnetomotive member and at least one or more magnetic detection member. 3. The magnetic power generating device according to claim 1, wherein the magnetic coupling member is used as an adjusting means. 4. A rotor magnet is fixed to the rotor, a drive coil is provided for rotationally driving the rotor through magnetic interaction with the rotor magnet, a stator member is provided on which the drive coil is mounted, and the stator member is The magnetic power generation device according to claim 1 or 3, characterized in that it is an adjusting means. 5. Two or more magnetic detection members are provided with a fixing member having a portion facing the stator member, and the fixing member is included in a closed magnetic circuit formed by the rotor and the magnetic detection member, and the above two The area and shape of the portion of the stator member that is opposed by at least one of the fixing members of each of the above magnetic detection members is made different from the area and shape of the portion of the stator member that is opposed by the other fixing member. The magnetic power generation device according to claim 4, characterized in that: