The Journal of the Institute of Electrical Engineers of Japan

On the Three Phase Arc

J. IMAMURA

1925 Volume 45 Issue 449 Pages 1143-1156
Published: 1925
Released on J-STAGE: November 20, 2008

DOIhttps://doi.org/10.11526/ieejjournal1888.45.1143

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Three phase arcs present some special features because their interphase relations, and are not to be simply conceived as a group of single phase arcs.
The author has observed at first the rotation of the arcs by means of a storoboscope, and then the current and voltage wave forms by an oscillograph.
Oscillograms are given for balanced arcs with similar electrodes and unbalanced arcs with electrodes different from each other in size, material and relative position.
The wave forms of three phase arcs, which are remarkably different from those of single phase a c-, are dependent upon the direction of arc rotation and are also much influenced by the degree of unbalance.
Whether the supply transformers are connected in delta or star has not shown any appreciable difference. When iron-cored inductances are inserted in each phase, the balance can be easily establishd, but when the inductance is put in one or two phases only, the arcs show marked unbalance and the current through one pole becomes decidedly rectified. Which pole happens to carry the rectified current depends upon the direction of the arc rotation.

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On the Acoustic Impedance at Sending End of a Conical Horn of Finite Length

K. KOBAYASHI

1925 Volume 45 Issue 449 Pages 1157-1169
Published: 1925
Released on J-STAGE: November 20, 2008

DOIhttps://doi.org/10.11526/ieejjournal1888.45.1157

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Acoustic impedances at sending ends of Conical horns of various length and solid angle can le measured by telephone receiver coupled with the horns. In this paper, the exp-rimental results as well as theoreticjl analysis are given. Calculations of this acoustic impedances from the dimentions of the lions and working frequency are des ribed in detail. The thozetical results were shown to be coincident with the results obtained from experiments.

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On the Wave Filter Which Can be Considered as a Compensated π Artificial Electric Line

KEN OKUBO

1925 Volume 45 Issue 449 Pages 1170-1188
Published: 1925
Released on J-STAGE: November 20, 2008

DOIhttps://doi.org/10.11526/ieejjournal1888.45.1170

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In this paper, the author treated the wave filter as an application of Compensated T Artificla Electric Line, published by Mrs. Nukiyama and Okabe in Denki Gakkai Zassi no. 413 (1922). The content is divided into the following parts:-
§1. I. On the onthne of Compe sated π Artificial Electric Line, and its application to the wave filter.
II. Example of calculation.
§2. I. Determination of cut off froquency.
II. Determination of fm, which gives the maximum of θ1.
§3. Design of wave filter.
§4. I. Type of wave filter.
II. Results of calculation on cach type.
§5. Conclusion.

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On a Starting Method of Squirrel-Cage Induction Motor

K. HARADA

1925 Volume 45 Issue 449 Pages 1189-1198
Published: 1925
Released on J-STAGE: November 20, 2008

DOIhttps://doi.org/10.11526/ieejjournal1888.45.1189

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To improve the starting conditiou of the squirrel-cige type induction motor, the auther has made a simple modification in the arrangement of the end rings of the rotor, so as to change the current dis.ribution in the rotor, ircuit by changing the no. of the stator poles in the ratio of 1 o 1/2. By this arrangement, the rotor effective resistance with the half no. of poles can be made considerably greater than that with the normal no. of poles. The motor is started with the hulf no. of poles, and at a suita le speed the no, of p les is restored to the normal, so that the starting current is reduced and, at the same time, the starting torque is made comparatively lame. The theory and experiment show that, by this method, the starting condition can be improved at least to the extent to which it can be done by the use of the starting compeusator.

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Characteristics of an Induction Motor and its Transient Phenomena.

JUTARO TAKEUCHI

1925 Volume 45 Issue 449 Pages 1199-1310
Published: 1925
Released on J-STAGE: November 20, 2008

DOIhttps://doi.org/10.11526/ieejjournal1888.45.1199

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The author's intention to this paper is to discuss the true circuit of the induction motor by the differential equations, and the characteristics of polyphase induction motor, especially the transient phenomena.
He discussed, first, general case of transient phenomena which occurs due to sudden change of supplying source of induction motor and generator, and few special cases, such as, switching in, witching off and sudden terminal short circuit & c. Finaly the numerical calculations and their comparison with experimental results by the actual machine are shown. Paper to be read before the meeting of Tokyo local section, on February, 1926.

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