TANSO
Online ISSN : 1884-5495
Print ISSN : 0371-5345
ISSN-L : 0371-5345
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Volume 1962, Issue 33
Displaying 1-7 of 7 articles from this issue
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  • Commutater films
    Kinji Kokubu
    1962 Volume 1962 Issue 33 Pages 2-8
    Published: November 20, 1962
    Released on J-STAGE: March 01, 2011
    DOIhttps://doi.org/10.7209/tanso.1962.33_2
    JOURNAL FREE ACCESS
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    By measuring electric characterisics with a Pt-probe and black bands of 3 kW commutation tester, the following results were obtained.
    (1) There are A, B, and β types in the “Fritting”, and they are different by film structure and film tkickness.
    (2) In good commutator films, histograms of their fritting voltage are plateau-form and their film thickness at “Mode” are about 250 Å and are scarcely under 80 Å.
    (3) The film resistance after the “Fritting” is a constant voltage type, and in good commutator films, histograms of their resistance are plateau-forrn and are scarcely under low resistance part.
    (4) The films have polarity effects and the fritting voltage at the probe positive derection is higher than that at the inverse direction. And besides, the film contact resistance at operating has about 60 in porality-ratio.
    (5) Fritting voltages become higher as humidity is decreasing.
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  • [title in Japanese]
    Tatuo Yamamura, Syogo Yamazaki
    1962 Volume 1962 Issue 33 Pages 8-11
    Published: November 20, 1962
    Released on J-STAGE: June 28, 2010
    DOIhttps://doi.org/10.7209/tanso.1962.33_8
    JOURNAL FREE ACCESS
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  • Reserchon Phenomena of Commutator Damage
    Hirogi Takahashi, Takaichi Takemasa
    1962 Volume 1962 Issue 33 Pages 11-22
    Published: November 20, 1962
    Released on J-STAGE: June 28, 2010
    DOIhttps://doi.org/10.7209/tanso.1962.33_11
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    Recently we have met very often with the Phenomena of Commutator damage in chemical factories, paper mills and steel factonies, but we have no adequate measure. Then, in order to solve the problem, we studied the phenomena of Commutator damage in normal atomospher, and the following results were obtained.
    It become clear by testing in every way that the Phenolnena was caused by electrolysis and mechanical scratch of the brush. And, as a result of experiment, we confirmed that the temperature, humidity, current density and brush material had influence on Commutator damage. Generally under the condition of high humidity and high current density the damage is due to electrolysis, but under the low humidity and poor cunrent density the damage is due to scratch of the brush.
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  • Transient Commutation of Direct Current Machines (I)
    T. Ichiki, H. Ishikawa
    1962 Volume 1962 Issue 33 Pages 23-27
    Published: November 20, 1962
    Released on J-STAGE: March 01, 2011
    DOIhttps://doi.org/10.7209/tanso.1962.33_23
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    When yorks and inter-pole cores of d. c. machines are solid and load current change is suddenly, instantaneous change of the air gap flux at interpoles is prevented due to eddy current formed in solid iron. Hence the perfoemance of the flux lags to load current change.
    Authoes analyzed the performance of air gap flux under the assumption that yorke and inter-pole coresare equivalent to secondary winding, and obtained the calculating equations which represented the transient behavior of the air gap flux.
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  • One Method of Commutation Ability Test
    Tomoyuki Somiya, Todao Ueki, Katsuhiro Okubo
    1962 Volume 1962 Issue 33 Pages 28-32
    Published: November 20, 1962
    Released on J-STAGE: June 28, 2010
    DOIhttps://doi.org/10.7209/tanso.1962.33_28
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    The Commutation ability is one of the important operating characteristics of the carbon brush. Hitherto, there are many methods, for example black band method, search coil method, null point method, pulse height analyzer method and NEMA method.
    In this paper, one method of commutation ability test is proposed, using only one brush on the simplified equivalent circuit of d. c. machine, while NEMA method uses two brushes. The shape and size of the non sparking region built by L (self inductance of the commutating coil) and I (brush current) is the measure of commutation ability. The generation of arc is detected by the voltage drop between the commutator and brush trailing side. This test could be recommended owing to its simple and rapid process.
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  • [title in Japanese]
    [in Japanese]
    1962 Volume 1962 Issue 33 Pages 33-42
    Published: November 20, 1962
    Released on J-STAGE: July 05, 2011
    DOIhttps://doi.org/10.7209/tanso.1962.33_33
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  • [title in Japanese]
    1962 Volume 1962 Issue 33 Pages 43-51
    Published: November 20, 1962
    Released on J-STAGE: June 28, 2010
    DOIhttps://doi.org/10.7209/tanso.1962.33_43
    JOURNAL FREE ACCESS
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