Abstract
Abstract In connection with the attempts to reduce the noise of electrical machinery in general, and more especially of small motors for domestic use, it is of importance to be able to calculate the natural frequency of the vibration. It is shown that the frame, which usually emits a large portion of the total noise, can, in many cases, be regarded as a part of a ring with rigid ends. Formulas and curves are given in the paper for the calculation of this fundamental frequency. The derivation of these formulas is not given in the body of the paper, but in an appendix.
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