抄録
The natural frequencies of raidal vibrations in models of the stator core of three induction motors were measured. It is found that two natural frequencies have the same deformation wave numbers and the relation between the deformation wave numbers and natural frequencies is represented by two curves. These curves have two asymptotes, one of which shows the characteristics of the natural frequencies of the ring, and the other shows the characteristics of those of teeth only. The lower of the two natural frequencies can be calculated precisely by Dunkerley's formula. The experimental results are in good agreement with the theoretical results calculated on the assumption that the vibration system is of two degrees of freedom.
