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Volume 41, Issue 401
Displaying 1-5 of 5 articles from this issue
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Tadaoki Yamamoto1921 Volume 41 Issue 401 Pages 875-891
Published: 1921
Released on J-STAGE: November 20, 2008
JOURNAL FREE ACCESSAlthough the induction motor and the synchronous motor have been developed as different machines, yet they belong to a class of alternating current motors having many common points, such as the same synchronous speed and similar magnetizing characteristic. The induction motor is superior in its starting characteristics, while the synchronous motor excels the former in its operating characteristics. Thus the combination of both characteristics in a motor is desirable, and has been partially realized by adding squirrel cage winding of certain design to the sync' ronous motor, by which the scope of its application has been extended to the present stage.
On the other hand, the same have been tried by synchronizing the induction motor and converting it into the synchronous motor at running condition; but the necessty of manual operation by the transition seems to have been the main point limiting the field of practical application.
The author, by the assistance of Mr. M. Kawarada, succeeded in making the transition from the induction into the synchronous motor perfectly automatic by the proper use of D. C. series machine as the exciter, in which the building-up of D. C. voltage was controlled to be timely. Besides, by providing high resistance squirrel cages, which act as wedges at once, the torque speed characteristic as induction motor is made substantially equal to that of Boucherot's doub e squirrel cage type.
By these, the induction synchronous motor in question can start with full load torque by the mere switching and run up to its synchronous speed by its own accord, exerting pull-in torque not less than full load torque.
The experiments made on 75 H. P. motor of such design are described with special reference to the oscillographic records of stator and rotor currents showing how the transition is natural.View full abstractDownload PDF (3869K) -
Masataro Kawarada1921 Volume 41 Issue 401 Pages 892-902
Published: 1921
Released on J-STAGE: November 20, 2008
JOURNAL FREE ACCESSWith a fixed resistame in the exciter circuit of a self excited D. C. generator, if the speed is changed or if the resistance is varied with speed kept constant, there will be building up, of terminal voltage in accordance with the characterstie curve of the machine. At other times, however, with the above conditions, there will occur fluctuation of terminal voltage. The author presents his theory relative to this phenomena and furthermore touches on the same peculiarity of sep rately excited D. C. machines.View full abstractDownload PDF (623K) -
K. Harada1921 Volume 41 Issue 401 Pages 903-909
Published: 1921
Released on J-STAGE: November 20, 2008
JOURNAL FREE ACCESSThe author was sent abroad by his principals to investigate electrical industries in general and in this paper the author tells what he saw there that would be of interest to the Japanese engineers. He emphasizes in particular the automatic substations of Cleveland, Ohio, U. S. A., the railroad electrification both in America and in Enrope, arc welding and the manufacture of electrical machinery and apparatus.View full abstractDownload PDF (1036K) -
R. Baba1921 Volume 41 Issue 401 Pages 910-928
Published: 1921
Released on J-STAGE: November 20, 2008
JOURNAL FREE ACCESSElectrical machines are sometimes subjected to intermittent loads that is for a few minutes a load may be put on and then a period of no load or to fluctuating cycles of heavy and light loads. For such con litions, the author presents in this paper the relation that exists between the temperature rise of a machine with the period of load and amount of load.
This paper also gives results of exper'ment carried out by the author using some of the formu'ae presented.View full abstractDownload PDF (1022K) -
Ikutaro Fukui1921 Volume 41 Issue 401 Pages 929-948
Published: 1921
Released on J-STAGE: November 20, 2008
JOURNAL FREE ACCESSWith the great development in telephone and telegraphic engineering, the use of dry core paper cable has become very extensive and its knowledge is becoming quite imperative to all engineers. The author describes the various kinds of dry core paper cables and the manufacturing processes connected therewith with a table of general dimensions and shapes of the materials used in the manufactuce of such a cable. Mention is also made of the various types of machinery used in the manufacture of dry core cable and the function each is supposed to perform. For the benefit of those interested, dielectric and other prop rties of the materials used in the cable with two or three examples of cable design.View full abstractDownload PDF (1384K)
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