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Volume 47, Issue 470
Displaying 1-8 of 8 articles from this issue
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Takabumi KUMAZAWA1927 Volume 47 Issue 470 Pages 897-902
Published: 1927
Released on J-STAGE: November 20, 2008
JOURNAL FREE ACCESSLately, the writer gave on this journal an essay on synchronous motors in violent hunting, under the title of "Experimental Study on the Hunting of Poly-phase Synchronous Motors". In this note, he has studied further on hunting which is electro-magnetically light, i.e. when the linkage flux is not so much diminished by the hunting.
The relation between the change of r.p.m. and the corresponding increase of input current is studied in such case. For under excitation, it is same as in the case of violent hunting, with similar curve as magnetization B-H curve.For over excitation, the curve of the relation shows also the same form, but of different inclination. For medium excitation, the increase of input current due to corresponding changes of r.p.m., is situated between the above said curves of the shape as B-H curve. Thus, as increasing the excitation from under to over degree, the increase of input current rounds a loop, (along up one B-H curve, to another B-H curve and then along down another B-H curve), during which the corresponding change of r.p.m. increases and decreases. Hunting of current produces some oscillation of phase angle. For violent hunting, the mean phase angle of such oscillation is always in lag. But in our case, this mean phase angle is not so different from that of steady condition.
Some theoretical explanations and conclusions are also given in this note.View full abstractDownload PDF (498K) -
I. KOGA1927 Volume 47 Issue 470 Pages 906-909
Published: 1927
Released on J-STAGE: November 20, 2008
JOURNAL FREE ACCESSHigh frequency oscillatory current of a thermonic vacuum tube undergoes the changes both in frequency and intensity under certain conditions when the following changes occurs:
1. Magnetic or static coupling between plate and grid circuut.
2. Magne' ic coupling between the oscillatory circuit and a short circuited coil or a metallic diaphragm nearby placed.
If one of these coils or a metallic diaphragm be made to be vibrated by a sound wave, the system may be employed as a microphone transmitter, the output of which is considerably greater than the Marconi's electromagnetic microphone and o hers. In case of a metallic diaphragm, the construction of the microphone is much simpler than the present condenser type microphone transmitters.View full abstractDownload PDF (230K) -
S. JIMBO, K. INAGAKI1927 Volume 47 Issue 470 Pages 910-916
Published: 1927
Released on J-STAGE: November 20, 2008
JOURNAL FREE ACCESSThe followings subjects about the phonic chronometer are investigated experimentally in order to check its reliability:
1. Hunting.
2. Gear ratio.
3. Variation in the frequency of tuning fork due to the room temperature.
4. Variation in the frequency of tuning fork due to the supplied voltage.
5. Effect of variation in the room temperature on the chronometer.
6. Effect of variation in the exciting current through the controlling magnet.
7. Irregularity in operation.
Summarizing the experimental results, it is as follows:
1. Hunting does not occur.
2. The gear ratio hardly changes due to the variation of room temperature.
3. The frequency of tuning fork slightly diminishes due to increasing the vibrational amplitude of the prong.
4. The performance of the chronometer slightly changes due to the variation of room temperature.
5. The error of the chronometer rapidly increases due to diminishing the exciting current through the controlling magnet.
6. The probable errer due to the irregularity of operation is nearly±0.003 seconds.View full abstractDownload PDF (893K) -
Teruo UEDA1927 Volume 47 Issue 470 Pages 917-933
Published: 1927
Released on J-STAGE: November 20, 2008
JOURNAL FREE ACCESSThe characteristics of the three phase compensated induction machine as the motor were calculated already by the author's method previously. In this paper the effects of the brush position on the torque characteristics of the said machine as the motor or the generator are calculated and also cons- idered standing on the torque equation of D=m1(Et/1+μcs) 2 (s-μcscosρ)rsc-μcssinρxst/(rsc 2+xsc 2)[1+2/1+μcs(b1rp+b2xp)+b1 2+b2 2/(1+μcs) 2(rp 2+xp 2)] All calculations are done in wide range of slip value. far up and below from the slip at which D=0 s0=rsccosρ+xssinρ/μcsrsc-xssinρ
The apparent inputs are calculated, and then, the relations between the torque efficiency and the brush position are explained. The effeots of the secondary resistance on the torque characteristics are also calculated. As the effect of the brush shifting is identical to the change of the phase angle of the secondary exciting voltage in the ordinary induction machine, the result of these calculations in this paper is the studies of the effect of the phase angle of the exciting voltage in the induction motor with three phase exciter, the asynchronous generator and the asynchronous condenser, after all.View full abstractDownload PDF (1292K) -
K. KUROKAWA1927 Volume 47 Issue 470 Pages 934-955
Published: 1927
Released on J-STAGE: November 20, 2008
JOURNAL FREE ACCESSActual drawings of fourty two different orthogonal systems are derived by the n-th root and inverse processes from the orthogonal system of confocal ellipses and hyperbolas. They give equipotentials and lines of force for different arrangements of charged strips and of charged strips and lines.
Electrostatic capacities of cylinders whose sections are the n-th root ellipses are also calculated.
In the appendix eleven simple relations of "power and root figure geometry" are stated with proof.View full abstractDownload PDF (1044K) -
Mochinori GOTO1927 Volume 47 Issue 470 Pages 956-968
Published: 1927
Released on J-STAGE: November 20, 2008
JOURNAL FREE ACCESSHeaviside's expansion, xk=E1 M1k(p0)/M(p0)εp0t-E1 Σm=n m=1 M1k(λm)ελmt/(p0-λm)M'(λm) is valid except in th case M(p0)=0, p0=λm, or M'(λm)=0 which makes the value of the expression indeterminate.
In this paper, the writer extended it to expansions which involve such cases.View full abstractDownload PDF (432K) -
S. BEKKU1927 Volume 47 Issue 470 Pages 969-972
Published: 1927
Released on J-STAGE: November 20, 2008
JOURNAL FREE ACCESSThe convenience of Heaviside's Expaxision Theorem for the mathematical study of transients in the electrical network is fully acknowedged among electrical engineers. As far as the auther is aware, the special case when the characteristic equation possesses multiple roots, is not generally discussed except the simplest case discussed by J.R. Carson and E.J. Berg. The author deduced the general formulae when any two of the roots are equal, and he will appreciate the member's suggestion for the more general case when the characteristic equation possesses multiple roots of any order.View full abstractDownload PDF (166K) -
Yoshimi MIYAMOTO1927 Volume 47 Issue 470 Pages 973-1006
Published: 1927
Released on J-STAGE: November 20, 2008
JOURNAL FREE ACCESSIn this investigation, the condition of the distribution of the magnetic fluex in the armature-core of D.C. and A.C. machineries is treated under the assumption that the armature is of the smooth core type.
The case of two different permeabilities is considered, and two special cases, of uniform permeability and with air-part, are introduced; then the obtained results are applied to the rotor and stator and the states of the magnetic flux distribution for these cases are shown with graphs and numericall calculations.View full abstractDownload PDF (1609K)
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