The Journal of the Institute of Electrical Engineers of Japan

Effeet of Saturation of Magnetic Leakage Path on the Circle Diagram of the Three Phase Induction Motor

J. T. TAKEUCHI

1922 Volume 42 Issue 408 Pages 491-502
Published: 1922
Released on J-STAGE: November 20, 2008

DOIhttps://doi.org/10.11526/ieejjournal1888.42.491

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It is well known fact and discussed by many authorities, that the satu-ration of the magnetic leakage path will affect upon the circle diagram of the three phase induction motor. Mr. B.A. Behrend (1) has shown that the circle diagram of the induction motor, which has closed slots, will be greatly deformed from the circle, and recently Mr.H.K. Whitehorn (2) has published very interesting paper which tell us the centre of the circle will be lowered owing to the saturation of the magnetic leakage path of the closed slots. These imestigations, however, tell us only the results of experiments and give no idea to correct the circle diagiam for this effect. The author explain here a new idea of the correction of the circle diagram for the effect of saturation.
The author's principle for the circle diagram is due to that "A circle of current locus, which is constructed from the test results of no load and of short circuit, is only true at a current by which the locked (or short circuit) test is carried out." Because the degree of saturation at the current, bywhich the motor is locked, is practically equal to the degree of saturation of the working condition of the same current.

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On the Performance Calculation of an Induction Motor

S. AOKI

1922 Volume 42 Issue 408 Pages 503-521
Published: 1922
Released on J-STAGE: November 20, 2008

DOIhttps://doi.org/10.11526/ieejjournal1888.42.503

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The characteristics of a polyphase induction motor is usually determined from the so-called "equivalent network" as shown in Fig. 1. An induction motor, however, may also be represented by a circuit shown in Fig. 5, which is much simpler for analysis than the circuit shown in Fig. 1.
For the purpose of calculating the performance of an induction motor, a vectorical constant (Modifying Coefficient)
C=1+Y0Z
=1+(Exciting Admittance)×(Primary Impedance)
is introduced. The method of calculation, using this Modifying Coefficient, is shown in detail. A method for properly determing the calculating constants from the test data is also suggested.
Finally the application of the Modifying Coefficient to the solution of the other electrical engineering problems, such as voltage regulation and other characteristics of transformers, transmission lines, etc is discussed.

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On the Submarine Accumulator

SAKAE MAKIO

1922 Volume 42 Issue 408 Pages 522-548
Published: 1922
Released on J-STAGE: November 20, 2008

DOIhttps://doi.org/10.11526/ieejjournal1888.42.522

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This paper relates to the accumulators used in submarines. The accum-ulators used in submarines differ from those used for stationary and other purposes.
It is true that the chemical actions are the same in all accumulators so far as lead-acid type is concerned, but its design, construction, operation and installation on board the submarine are unique and require a special consideration. Being of the secret affairs of the Navy, nothing has been discussed hitherto, and naturally no paper has yet been written on this special subject.
The auther therefore, goes to show as far as permissible, the information which he has obtained from all the available sources of the French, Itarian, German and United states Navies as well as those gained as theresult of his investigations.
This paper is divided into four principal sections as follows:
(I) Introduction.
(II) Manufacture and properties of Submarine Battery.
(III) Installation and treatment.
(VI) Operation and Characteristics.

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