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Volume 47, Issue 462
Displaying 1-5 of 5 articles from this issue
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K. BABA1927 Volume 47 Issue 462 Pages 3-25
Published: 1927
Released on J-STAGE: November 20, 2008
JOURNAL FREE ACCESSNew type of high speed circuit breaker which is developed recently, is explained and considered with experimental study. It has two independent magnetic armatures one for holding and the other for tripping. There is no mechanical travel to trip off the contact, thus eliminating dead time of armature stroke. It has no polarization effect for direction of current and by adequately proportionating the time constants of two parallel circuits for tripping and impedance shunt, the initial dead time of breaker operation is minimized just in the same way as for breakers having superposed tripping magnetism on the holding electro-megnet. The trip free mechanism is also novel. The new breakers are tested by 1500V 2000KW convertor set with terminal short circuit.View full abstractDownload PDF (4685K) -
S. UDA1927 Volume 47 Issue 462 Pages 26-51
Published: 1927
Released on J-STAGE: November 20, 2008
JOURNAL FREE ACCESSThe action of a straight metallic rod of finite length vertically erected in the radiation field of a sending antenna is studied theoretically and tested by experiments. The results are as follows:-
When the natural frequency of this metal rod is equal to the wave frequency, the current induced in it will be in phase with the E.M.F. caused by the electric wave, and, as is well known, the wave is reflected by this rod. Even if the natural frequency is made somewhat lower than the resonance frequency by increasing the length of rod, the current induced in it will be lagging behind the E.M.F., and the reflecting action will still be manifest.
On the other hand, if the natural frequency is made higher, to a certain extent, than the resonance frequency by shortening the length of rod, the current induced in it will be leading before the E.M.F., and when the phase angle the magnitude of the current obtain suitable values, the wave is further transfered forwards beyond the rod. The rod is now acting as a means of converging the wave energy and transmitting it further with more concentration and is therefore now called a wave director.View full abstractDownload PDF (1227K) -
High Angle Radiation of Short Wave BeamS. UDA1927 Volume 47 Issue 462 Pages 52-62
Published: 1927
Released on J-STAGE: November 20, 2008
JOURNAL FREE ACCESSThe paper consists of experimental studies on the distribution of energy in a vertical plane radiated from a sending antenna which is tuned in different higher harmonics.
The field intensities in various altitudinal directions are measured by the receiving apparatus which is moved along a vertical line. A single vertical metallic rod is used as the antenna and first is not earthed. The length of the antenna is varied to be equal to λ, 3/2λ, or 2λ (λ represents the wave length equal to 266 cms.), So that it oscillates in the second, the third, or the fouth harmonic. The distribution diagrams for above cases are given and from there curves, the following conclusions are confirmed.
In all above cases, the wave energy is projected chiefly in upward directions and almost no radiation along the earth's surface is transmittad. When the length of the antenna is made to be equal to full wave length, only one maximum radiation will occur, but when the length of it is equal to 3/2λ or 2λ, the wave d rected upwards will split up in two or three parts and consequently two or three points of maximum radiation will exist.
Some experiments are also made with the earthed vertical antenna and the length of it is changed to equal to 3/4λ, 5/4λ, 7/4λ, or 9/4λ. In these cases, it may be stated again that the radiation projected at high angles is very intense, while the energy to flow along the earth is very feeble. And also it will be seen that if the antenna is excited by the 7th or the 9th harmonic (the length of it is equal to 7/4λ or 9/4λ.), the wave radiated upwards will split up in two or three parts.
In the paper, the results are also described that the directive radio transmission with high angle radiation is easily obtained by using three vertical metal rods consisting of the trigonal reflecting system. In this case, the length of the antenna and three reflectors is made to be equal to the wave length and thus they are all excited by the second harmonic oscillation. The distribution curves show obviously that these three reflectors are effective in producing a directive radio wave with high angle radiation. Combined with the trigonal reflector above mentioned, if several wave director rods, arranged along an inclined line of the direction of maximum radiation, are employed, the directivity will be much improved.View full abstractDownload PDF (687K) -
TERUO UEDA1927 Volume 47 Issue 462 Pages 63-69
Published: 1927
Released on J-STAGE: November 20, 2008
JOURNAL FREE ACCESSIn the present paper it is explained that although there are many methods, in practice, for the power factor compensation of the polyphase induction motor; it is seemed most economical for small size of induction machine from the design considerations of electric machine that the compensating means make a part of electric or magnetic circuit of the motor. Then the writer is saying that the compensated induction motor will be the very best one as the induction motor of high power factor from such a view point. A typical type of the compensated induction machine is quated and explained its theory standing on its vector diagram.
A method of calculation of the performance characteristics of such a type of the machine is shown and arranged in order to be convenient for the calculation in routine work in practice. The performance characteristics under various brush angle is calculated by the author's method and researched the effect of the brush position on its performance characteristics summarizing these results of calculation. Then the meaning of the best brush position is explained clearly.
The calculations were done using the necessary constants which were obtained from the test machine and then their results are compared with that obtained from actual load test of the machine. These comparisons show that this method of calculation is worthy to determine the performance characteristics of such a machine relying on, not load test, but loss tests only.
The primary current wave is very spoiled containing several higher harmonics generally in such a type of machine and, for example, the oscillograms taken by the test machiue are shown for our information. At last the compensated induction machine as the generator is considered briefly.View full abstractDownload PDF (3640K) -
1927 Volume 47 Issue 462 Pages 102
Published: 1927
Released on J-STAGE: November 20, 2008
JOURNAL FREE ACCESSDownload PDF (35K)
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