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Volume 45, Issue 447
Displaying 1-8 of 8 articles from this issue
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Y. TORIYAMA1925 Volume 45 Issue 447 Pages 851-858
Published: 1925
Released on J-STAGE: November 20, 2008
JOURNAL FREE ACCESSIt is a very known fact that there is dielectric hysteresis loss in homogeneous dielectrics. But the theory of this phenomena is not quite distinct. The author explains thene phenom-ena by the conception of space charge.
The specific resistance of insulator d creases with potential gradient and also with increasi g of thickness at a constant potential gradien. These facts have not been explained clearly by this time. The almost parts of coadustion current in insulators are con ucted by electrolytic ions. We can devide the resistance in dielectrics into two part, that i, one part is resistance of insulator itself, and the other part is the resistance between insulator and electrodes. The author calls the latter the "surface resistance", and explains the above mentioned two phenomena by this consideration.View full abstractDownload PDF (550K) -
YASUSI WATANABE1925 Volume 45 Issue 447 Pages 859-869
Published: 1925
Released on J-STAGE: November 20, 2008
JOURNAL FREE ACCESSThe duplex valve oscillator, as the writer suggests to call it, is the valve oscillator containing two oscillation circuits as shown in Fig. 1. The natural frequencies are so much different from each other that the impedance of the one cirouit at the frequency, which is given by the constants of the other circuit, is negligibly small compared with th internal resistance of the valve.
In this paper is treated the stability of the oscil ation produced by means of such a duplex cscillater. For exsmple, when the capacity of the variable condencer in the high frequeney φ oscillation circuit is varied gradually, sudden change in the fr quency of the esci lation takes place at two points J1 and J2, as shown in Fig. 2.
Such a jumping phenomenon may be explained by taking into consideration the variation of the internal resistance of the valve, which is dependent upon the amplitude of the oscillating plate curr nt.
More vor, the writer considers the case, where two oscillations, one of high frequency and the other of low frequency, can build up simultaneously, and shows come experimental results obtained by means of a Braun tube oscillograph.
Some circuital arrangements of the duplex osci lator are shown in Fig. 16.View full abstractDownload PDF (1041K) -
MATSUJIRO OYAMA1925 Volume 45 Issue 447 Pages 870-888
Published: 1925
Released on J-STAGE: November 20, 2008
JOURNAL FREE ACCESSThis is a report of te ts on characteristics of space heaer, and consists of the following articles.
1. Introduction
2. Construction
3. Starting current and power factor etc
4. Insulation
5. Temperature rise and tempe tature distribution
6. Heat dissi ation
7. Effect of cover
8. Temperature deterioration of cloth. intentionally touched
9. Summary
10. AppendixView full abstractDownload PDF (2767K) -
KAZUKIYO OGAWA1925 Volume 45 Issue 447 Pages 889-902
Published: 1925
Released on J-STAGE: November 20, 2008
JOURNAL FREE ACCESSThe alternating current source for measuring purposes is usually unbalanced against the earth. The quiv lent circuit of the unbalanced alternating ourrent source is first considered and the idea of the physical and the easth eircuit is givon. By the aid of this idea, it is discussed whether we can make any alternating carrent source balaneed against the earth by connecting a su table network between the source and the load. The ordinary transformer is proved to be not suitable for this purpose on account of the distributed capacity between the primary and the secondary coils. Two kinds of balancing transformers are d scribed which were wocnd by the author with good resnlts. Finaily it is noticed that the retardation coil, if connected in shunt with the source and its middle point earthed, has slightly the effect of reducing the unbalance of the source.View full abstractDownload PDF (838K) -
TERUO UYEDA1925 Volume 45 Issue 447 Pages 903-917
Published: 1925
Released on J-STAGE: November 20, 2008
JOURNAL FREE ACCESSIt is described that the three phase series commutator motor of the doubly feed type is valuable to b used in practice. The adjustment of the speed in such a type of these machines, in mos cases, is done by the shifting of the brushes automatically or by hand. The stiffness, in this paper, means the ratio of the magnet motive force of the roter to that of the stator and is shown by
μ=[MmrWmrfr/MmsWmsfs][MtsWts/MtrWtr.]
The important points to be noticed for the vector analysis of this motor are explained tanding upon the considerations for the stiffness. The states of the variation of the current locus which is obt ined by the inversion of the voltage vector diagram are considered under constant value of stiffness, but on the variable brush angle and also the limit of stable operation. Then after the effect of the variation of the stiffncss under constant impre sed voltage and constant brush angle for the states of the current locus are considered, the comparison of the results, obtained experimentally and that obtained graphically, mainly on the effect of the saturation of the magnetic circuit have been explained.
The variation of the quantity of the main flux and its stat s are th fundamental factors for the charasteristics of the motor on the design considerations of the stiffncss and the saturation. The curves which show the variation of the main flux under various condition of magnetic saturation, various stiffness, and varicus brush angle are calculated point to point. The main flux is deromposed into two components, one of which is effective for the motor output and the other for the phase compensation and this decomposi ion is dspended upon to the stiffness and the brush angle. From these conslderations the output coefficient of this type of the mach ne must be explained by
r=.116BgACfs√1+2μcosρ+μ2S210-11.
The relation between the stiffness and the brush angle on the phase compensation are explained generally. The experi ental results are shown about the satu ation effect of the rotor transformer under constant stiffness and constant brush angle =145°, and next the cffect of stiffness under constant angle =145° on the various characteristics of the machine.View full abstractDownload PDF (911K) -
S. MATSUMAE1925 Volume 45 Issue 447 Pages 918-931
Published: 1925
Released on J-STAGE: November 20, 2008
JOURNAL FREE ACCESSThe writer measured the grid current of the triode valve by the alternating current potentiometer and studied the characteristics of the impedance between the filament and the grid at the various grid conditions.
The treatment of the alternating current potentiometer in measuring such weak alternating currents is also described.View full abstractDownload PDF (735K) -
TAKASI OHTSUKI1925 Volume 45 Issue 447 Pages 932-937
Published: 1925
Released on J-STAGE: November 20, 2008
JOURNAL FREE ACCESSThe components of the th d harmcnic current on a normally operated three-phase line are dis ussed for various transformer-connections and neutral grounding systems. When the neutral point either on the sending end or the receiving end is grounded in some way, there exists always a third harmonic charging current in the line more or less, depending on the neutral grounding systems, the line-constants and the amount of the thirdharmonic induced e.m.f. in the respective windings. The charging current may be capacitive or inductive due to the line-length and neutral grounding systems adepted, as shown in the previous supplementary paper (J.I.E.E. of Japan. July. 1925) relating to the earth coils compensation by the same anther.
On grounding the both end-neutrals, the third harmonic circalating current through the line and earth, as well as the third harmonic component of the magnetizing current fo the transformer bank at the receiving end should be added to the above cherging currents. Although it is very difficult to express the exact resultant neutral current in a simple formula, the grounding of both end-neutrals does not always increase the neutral current on the single grounding system, in regard to the respective phase relations, according to a theoretical con ideration and an experimental observation. There is also warned for the resonant condition of tLe system with respect to the third harmonic neutral current, offering a general equation for its charging and circulating current comporents.View full abstractDownload PDF (513K) -
1925 Volume 45 Issue 447 Pages 938
Published: 1925
Released on J-STAGE: November 20, 2008
JOURNAL FREE ACCESSDownload PDF (21K)
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