JP2014165374A - Ac device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an AC device that is able to reduce sounding by decreasing influence of magneto-striction, and is able to prevent waveform distortion of an AC signal by decreasing the size of an inductor formed from iron and cable, thereby decreasing the size of parasitic inductor.SOLUTION: In an AC device in which a housing case is formed in a specific shape from an iron plate so as to accommodate a body inner container and a current terminal is provided so as to expose from the housing case, a slit is formed between the current terminals of the housing case.

Description

  The present invention relates to an AC device, and more particularly to improvement of the influence of magnetostriction caused by a large current.

  In order to calibrate an AC meter such as a general-purpose AC voltage / current indicating meter or a multimeter having a high input impedance, an AC standard voltage / current generator as described in Patent Document 1 is used.

  According to this AC standard voltage / current generator, an AC voltage of 1 mV to 1200 V or an AC current of 1 mA to 60 A controlled to an output error sufficient for calibration over a frequency range of 40 to 1000 Hz, for example, is applied to the meter to be calibrated. Can be output.

  By the way, since such an AC standard voltage / current generator outputs a relatively high AC voltage or AC current, the output transformer is also relatively large and its weight is considerably increased.

  Therefore, in manufacturing the case for housing the main unit of the AC standard voltage / current generator, the iron plate may be punched into a predetermined shape and bent in order to increase rigidity and reduce costs. Has been done.

  FIG. 3 is an explanatory diagram showing the structure of an example of the front surface of a housing case that houses a conventional AC standard voltage / current generator body, and is a schematic pattern diagram of main parts of an operation panel superimposed on a punching pattern of an iron plate. is there. In FIG. 3, the current output terminals 1 and 2 are provided on the bottom side of the center on the right side of the front. The voltage output terminals 3 and 4 are provided in the vicinity of the top of the current output terminals 1 and 2 at a narrower interval than the current output terminals 1 and 2.

  An output display unit 5 is provided above the voltage output terminals 3 and 4, a deviation display setting unit 6 is provided adjacent to the output display unit 5, and a main setting display unit 7 is adjacent to the deviation display setting unit 6. A frequency / phase setting display unit 8 is provided adjacent to the main setting display unit 7.

  Below the deviation display setting unit 6, a sweep switch 9 and an output switch 10 are provided in the vertical direction, and an output division display setting unit 11 is provided adjacent to the sweep switch 9 and the output switch 10, and the output division display setting unit 11. A voltage / current range selection unit 12 is provided adjacent to the voltage / current range selection unit 12, and a frequency range selection unit 13 is provided adjacent to the voltage / current range selection unit 12.

In such a configuration, the output display unit 5 displays a set value represented by the following expression.
Set value = Main setting x Output division + (Main setting x Deviation)
Here, the main setting is a main setting value set by the main setting display unit 7, the output division is an output division value set by the output division display setting unit 11, and the deviation is a deviation value set by the deviation display setting unit 6. With these settings, a desired current or voltage is output to the current output terminals 1 and 2 or the voltage output terminals 3 and 4.

  Patent Document 1 describes the configuration, operation principle, function, and the like of a commercial AC standard voltage / current generator.

Yuuki Utsumi, 5 others, “New Generator Series-Voltage / Current Generator”, Yokogawa Technical Report, Yokogawa Electric Corporation, 1979, Vol. 13 No. 4 (1979) p. 48-50

  By the way, when an output cable (not shown) is connected to the current output terminals 1 and 2 of the voltage / current generator configured as described above to generate an alternating current, a magnetic field is generated from the current output terminals 1 and 2 and the cable. .

  Then, due to the influence of the magnetic field, the iron or the like of the housing case that forms the terminal portion that is a magnetic body and the terminal fixing portion is distorted.

  Moreover, since the shape of iron changes due to magnetostriction, noise is generated.

  Moreover, an inductor is formed by the iron and the cable of the housing case. The generated alternating current can be viewed as an inductor formed by this iron and cable. This inductor worsens the distortion of the current waveform as the frequency and current value of the generated alternating current are higher.

  Furthermore, since a parasitic inductor is seen with respect to a load (voltage) that can be generated, the load (voltage) that can be output by the device is reduced.

  The present invention solves these problems, and its purpose is to reduce the noise by reducing the influence of magnetostriction, and to reduce the parasitic inductor by reducing the inductor formed of iron and cable. An object of the present invention is to provide an AC device that can be reduced to improve waveform distortion of an AC signal.

In order to achieve such a problem, the invention according to claim 1 of the present invention is:
In the AC device in which the housing case is formed in a predetermined shape with an iron plate so as to store the internal organs, and the current terminal is provided so as to be exposed from the housing case,
A slit is formed between current terminals of the housing case.

The invention according to claim 2 is the AC device according to claim 1,
The slit is provided by a linear cut.

The invention according to claim 3 is the AC device according to claim 1 or 2,
The AC device is a voltage / current generator.

The invention according to claim 4 is the AC device according to claim 1 or 2,
The AC device is an AC load.

  As a result, the inductance due to the iron plate forming the housing case and the cable connected to the current terminal is reduced, the effect of magnetostriction is improved, the sound of the housing case is reduced, the output resistance is reduced, and the AC signal is reduced. The distortion rate can also be improved.

It is a configuration explanatory view showing an embodiment of the present invention. It is operation | movement explanatory drawing which connected the cable to the alternating current apparatus of FIG. It is composition explanatory drawing which shows an example of the conventional alternating current apparatus.

  Hereinafter, the present invention will be described in detail with reference to the drawings. FIG. 1 is a block diagram showing an embodiment of the present invention, and the same reference numerals are given to portions common to FIG.

  In FIG. 1, for example, a slit 14 formed by cutting is provided in a mounting hole portion to which the current output terminals 1 and 2 on the front surface of the housing case are attached so as to connect both the holes.

  In such a configuration, magnetostriction occurs in the iron constituting the casing case due to the influence of the magnetic field, but most of the force applied to the iron due to the magnetostriction is absorbed by the slit 14 portion, and the casing due to the influence of the magnetic field. The size of the case deformation can be reduced.

  And the sound generated by the change in the shape of the iron accompanying the generation of the magnetic field can be reduced as compared with the conventional case because the distortion of the iron is reduced.

  FIG. 2 shows a state in which a load 17 is connected to the current output terminals 1 and 2 of FIG. 1 via output cables 15 and 16.

  In FIG. 2, the inductor is formed by the iron of the housing case and the output cables 15 and 16, but the parasitic inductor is compared with the conventional construction shown in FIG. 3 by inserting the slit 14 in the iron plate constituting the housing case. Become smaller. As the inductor load decreases, the output resistance decreases, and the waveform distortion of the AC signal output to the load 17 also decreases.

  In the above embodiment, an example of a voltage / current generator is described as an AC device. However, the present invention is not limited to this, and the present invention is also effective for handling a large current AC such as an AC load.

  Moreover, in the said Example, although the slit 14 was formed in the linear form, it was not restricted to a linear form, A zigzag form or a curved form may be sufficient.

  As described above, according to the present invention, the inductance due to the cable connected to the iron plate forming the casing case and the current terminal is reduced, the effect of magnetostriction is improved, and the noise of the casing case is reduced, The output resistance is reduced, and an AC device that can improve the distortion rate of the AC signal can be realized.

1, 2 Current output terminals 3, 4 Voltage output terminals 5 Output display section 6 Deviation display setting section 7 Main setting display section 8 Frequency / phase setting display section 9 Sweep switch 10 Output switch 11 Output division display setting section 12 Voltage / current range Selection unit 13 Frequency range selection unit 14 Slit 15, 16 Cable 17 Load

Claims (4)

In the AC device in which the housing case is formed in a predetermined shape with an iron plate so as to store the internal organs, and the current terminal is provided so as to be exposed from the housing case,
An AC device, wherein a slit is formed between current terminals of the housing case.   The AC device according to claim 1, wherein the slit is provided by a linear cut.   The AC device according to claim 1, wherein the AC device is a voltage / current generator.   The AC device according to claim 1, wherein the AC device is an AC load.

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