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Volume 46, Issue 455
Displaying 1-6 of 6 articles from this issue
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S. BEKKU, M. DOTE, M. URUSHIBATA1926 Volume 46 Issue 455 Pages 585-600
Published: 1926
Released on J-STAGE: November 20, 2008
JOURNAL FREE ACCESSAs shown by one of the writers, three impedances, characteristic for the machine are required to know the behavior of the three phase alte nator with
unbalanced load. One of the three impedances is the well-known synchronous impedance and it can be obtained from open-circuit and short-circuit test.
The other two, viz. zero and negative phase sequence impedances are not so widely known and as far as the writers are aware, no method of their measurement has been proposed other than those described by one of the writers in his prevlous paper.
In this paper various other methods are shown and the results of test performed on several machines are compared. The most convenient practical method
of measuring the negative phase sequence impedance is to short-circuit two terminals b and c directly and connect the remaining terminal a to the short-
cirouited terminals through any convenient resistance or impedance Z. measuring the current in each line, the negative phase sequence current, Ia2 refer-
red to I is easily obtained graphically. If the negative phase sequence impedance of the alternater under test be Z2, then it is shown in the text
Ia/Ia2=3Z2/Z
Since Z is known, Z2 can be obtained in magnitude as well as in phase angle.
The values of Z2 measured with various different methods check very well. This fact shows that the method of symmetrical coordinates, which is rgorously correct for the ideal alternator, is also applicable with engineering accuracy to the commercial alternator.View full abstractDownload PDF (3135K) -
K. KOBAYASHI1926 Volume 46 Issue 455 Pages 601-611
Published: 1926
Released on J-STAGE: November 20, 2008
JOURNAL FREE ACCESSGeneral equation of velocity potential, which is satisfied in horns of various shapes, was given by Prof. A. G. Webster in 1919, as
∂2φ/∂t2=υ2[∂2φ/∂x2+d(loga)/dx ∂φ/∂x]
We derived the acoustic impedance density at the sending end of an exponential horn of finite length from this equation, and calculated this value assuming that the air membrane at the open end has an infinite rigid flange, and compared this calculated value with the value which was obtained experimentally by measurement of motional impedance of a telephone receiver, coupled with an exponential horn. In this paper, the theory and experiments are described in detail, and it is shown that the calculation of the acoutic impedance of the sending end of an exponential horn by this theory gives satisfactory results in practical case.View full abstractDownload PDF (500K) -
S. CHIBA, S. KITTA1926 Volume 46 Issue 455 Pages 612-621
Published: 1926
Released on J-STAGE: November 20, 2008
JOURNAL FREE ACCESSThe rectifying property of three-electrode or four-electrode valve may be conveniently used to construct voltmeters which absorb negligibly small amount of powers from the circuit under test. These voltmeters have also anothor advantage that its indication is relatively free from errors up to a very high frequency.
Three types of valve voltmeters are explained in the papar. In the first, as in Moullin voltmeter type-A, the plate current-grid voltage characteristic is
utilized. In the second, as in Moullin voltmeter type B, the grid current-grid voltage characteristic is utilized. In the third type which authors denote by type-C, both these characteristics are utilized, A Stemen's audio-frequency voltmeter belong to this class.
All these kinds of valve voltmeters are constructed by the authors and their test results shown. The effect of the change of filament current and of the
plate voltag on the calibration of voltmeters are als ao considered.
The authors recommend type-C voltmeters with a stopping condenser C anda leak resistance R in the grid circu't. (Fig. 15) Their difference from Moullin type-B voltmeters is that their plate voltage is relatively low (5 to 8 volts)
Finally various fields of application of valve voltmeters are men ioned. Some of the test results obtained with the vollmeters on radio frequency amplifier, audio frequency and radio-frequency wave filter measurements are given.View full abstractDownload PDF (670K) -
T. HOASHI1926 Volume 46 Issue 455 Pages 622-631
Published: 1926
Released on J-STAGE: November 20, 2008
JOURNAL FREE ACCESSThe Heaviside's expansion theorem which to be employed for the calculation of transient phenomena of an electrical system when the electro-motive-forces
suddenly changed, is also applicable to the calculation of the transient phenomena when the circuit constants were changed suddenly.
The present writer shew a few simple examples of the calculation for the such cases.View full abstractDownload PDF (377K) -
YASUSI WATANABE1926 Volume 46 Issue 455 Pages 632-638
Published: 1926
Released on J-STAGE: November 20, 2008
JOURNAL FREE ACCESSThe present report is the supplement to the paper "Experimental Studies of the Input Admittance at High Frequency", published before by the same author.
It concludes the following topics.
(1) The input admittance of triode valve at high frequency may be measured d rectly by means of C.R. type potentio-meler. One example ofexperimentally obtained circle diagrams of the input admittance is given for the verification of the theoretical study. In our experiment, the frequency is 100, 000-/sec.
(2) One of the neutralizing methods is discussed, in which the capacitive conpling between the plate and the grid is compensated by the inductance, counected in parallel with the plate-grid capacity.
The circle diagram of input admittance may become more less, the finer the compensation is adjusted.
In the next place, the value of resistance of the neutralizing coil is considered, which is required for effective neutralization.View full abstractDownload PDF (314K) -
K. KUROYANAGI1926 Volume 46 Issue 455 Pages 639-685
Published: 1926
Released on J-STAGE: November 20, 2008
JOURNAL FREE ACCESS
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