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Journal of the Society of Motion Picture Engineers ( Volume: 36, Issue: 5, May 1941)
[ACTIVE]

Stability of Synchronous Motors

Metadata

Publisher
SMPTE — White Plains, NY, USA
Doc Type
Journal Article
Content Type
Original Research
Abbreviated Title
J SMPE
Volume
36, No. 5, pp. 514–554
Abstract
For the most part, since the advent of talking pictures, motors have been employed whose performance is excellent. The various types of motor, however, differ widely in their ability to resist load irregularities and in their tendency to oscillate when a disturbance occurs. For the more critical applications these factors deserve careful consideration when the type or design is being selected. The principal types of synchronous motor are (1) the variable-reluctance or induced-pole motor, (2) the separately excited motor, (3) the a-c-d-c motor, (4) the hysteresis motor, (5) the low-speed multi-tooth motor (of the type used for electric clocks), (6) the polyphase, uniform-torque modification of number 5, and (7) selsyn motors. Many of the characteristics of synchronous motors may best be understood by assuming that the polyphase winding produces a uniformly rotating magnetic field, but estimating the stiffness and stability demands a knowledge of the manner in which the a-c input varies with mechanical displacement. Generous pole-face grids are essential for stability. A-c-d-c motors have certain elements of instability as well as stabilizing factors, which are not present in straight synchronous motors. The magnitude of these effects can to some extent be controlled by the external circuit arrangements. Selsyn motors are less readily damped than regular synchronous motors, and for this reason arrangements by which the synchronous motors can be interlocked from standstill are of interest.
Publication Date
1941-05-01
DOI
10.5594/J12903
ISSN
Print: 0097-5834
Link
https://doi.org/10.5594/J12903
Author(s)
S. ReadRCA Manufacturing Co., Camden, N. J.
E. W. KelloggRCA Manufacturing Co., Camden, N. J.
Copyright
© 1941 Society of Motion Picture and Television Engineers, Inc.

Bibliographic Reference(s)

  • Liwschitz M. M. : “Positive and Negative Damping in Synchronous Machines,” Amer. Inst. Elec. Eng. , Philadelphia Convention (January, 1941 ). EXTERNAL
  • Concordia C. Carter G. K. : “Negative Damping of Electrical Machinery,” Amer. Inst. Elec. Eng. , Philadelphia Convention (January, 1941 ). EXTERNAL
  • Nickle C. A. Pierce C. A. : “Stability of Synchronous Machines—Effect of Armature Circuit Resistance,” Trans. Amer. Inst. Elec. Eng. , 49 (Jan., 1930 ), p. 338 . EXTERNAL
  • Wagner C. F. : “Effect of Armature Resistance upon Hunting of Synchronous Machines,” Trans. Amer. Inst. Elec. Eng. , 49 ( 1930 ), p. 1011 . EXTERNAL
  • Linville T. M. : “Starting Performance of Salient-Pole Synchronous Motors,” Trans. Amer. Inst. Elec. Eng. , 49 (April, 1930 ), p. 531 . EXTERNAL
  • Liwschitz M. M. : “Starting Performance of Salient-Pole Synchronous Machines,” Trans. Amer. Inst. Elec. Eng. , 59 ( 1940 ), p. 913 . EXTERNAL
  • Crary S. B. : “Two-Reaction Theory of Synchronous Machines,” Elec. Eng . (Jan., 1937 ), p. 27 . EXTERNAL
  • Park R. H. : “Two-Reaction Theory of Synchronous Machines—Generalized Method of Analysis—Part I,” Trans. Amer. Inst. Elec. Eng. , 48 (July, 1929 ), p. 716 . EXTERNAL
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S. Read and E. W. Kellogg; Stability of Synchronous Motors, Journal of the Society of Motion Picture Engineers ( Volume: 36, Issue: 5, May 1941); SMPTE, 1941. Available at https://doi.org/10.5594/J12903
Snippet:
S. Read and E. W. Kellogg; Stability of Synchronous Motors, Journal of the Society of Motion Picture Engineers ( Volume: 36, Issue: 5, May 1941); SMPTE, 1941. Available at https://doi.org/10.5594/J12903

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S. Read and E. W. Kellogg; Stability of Synchronous Motors, Journal of the Society of Motion Picture Engineers ( Volume: 36, Issue: 5, May 1941); SMPTE, 1941. Available at https://doi.org/10.5594/J12903
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<span class="citation">S. Read and E. W. Kellogg; <cite>Stability of Synchronous Motors</cite>, Journal of the Society of Motion Picture Engineers ( Volume: 36, Issue: 5, May 1941); SMPTE, 1941. Available at <a href="https://doi.org/10.5594/J12903" target="_blank" rel="noopener">https://doi.org/10.5594/J12903</a></span>

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S. Read and E. W. Kellogg; Stability of Synchronous Motors, Journal of the Society of Motion Picture Engineers ( Volume: 36, Issue: 5, May 1941); SMPTE, 1941
doi: 10.5594/J12903
url: https://doi.org/10.5594/J12903
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S. Read and E. W. Kellogg; <cite id="bib-10-5594-j12903">Stability of Synchronous Motors</cite>, Journal of the Society of Motion Picture Engineers ( Volume: 36, Issue: 5, May 1941); SMPTE, 1941
<span class="doi">10.5594/J12903</span>
</li>