Abstract
V.
The Evolution of the Multiphase Alternate Current Motor.
THE two-phase alternate current motor described in Part IV. has the disadvantage that, not merely does the magnetic field rotate, but it also varies in strength: this causes the driving force to fluctuate, and diminishes the power that the motor would otherwise give out. That there is this variation in strength of the magnetic field may be seen from Fig. 17, where the continuous curves I and II show at any moment the strengths of the currents in the coils I and II, Fig. 12 (repeated for reference from the last article); while the dotted curves I2, II2, in Fig. 17, give the values at any moment of the currents in the coils I2, II2, in Fig. 12. For example, when the time equals a (Fig. 17), the currents flowing in the coils I and II have respectively their maximum value and nought; whereas when the time equals b, the currents flowing in each of these coils is the same, being equal to 2 x sin 45° into the maximum value.
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A., W. Some Notes on the Frankfort International Electrical Exhibition.1. Nature 45, 54–60 (1891). https://doi.org/10.1038/045054a0
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DOI: https://doi.org/10.1038/045054a0