Abstract
While environmental issue, typically global warming is attracting attention for industrial machinery systems, the expectations of environmentally friendly industrial machinery have been increasing from various perspectives. These expectations include not only reduction of size, weight and electricity consumption, but also reduction of acoustic noise. In acoustic noise of industrial motors, in particular, an electromagnetic acoustic noise is jarring in a zone of audibility. An electromagnetic noise is likely to increase when frequency components of the electromagnetic force stimulate natural frequencies of a motor. In order to avoid the resonance with natural frequency, machine designers have a strong demand for accurate calculations for these natural frequencies in a design phase. Anticipating this demand, this paper studies a simulation method to estimate vibration characteristics of a rotor assembled in a motor.-
