RECENT TRENDS IN THE NOISE AND VIBRATION INVESTIGATIONS OF ASYNCHRONOUS MOTORS

Abstract

In semiconductor drives controlled by thyristors, a voltage rich in time harmonics gets to the terminals of the asynchronous motor, and under certain circumstances this leads to a considerable increase of noise and vibration. It became necessary to elaborate the theory of the noise and vibration changes arising in the transient operation of asynchronous motors, as well as to develop transient measurements, as the users do not accept the increase of noise during the transient as a law of nature. Present article deals with this problems and demonstrates the physical phenomenon causing increase in noise and vibration.