Analysis of Oscillation Behavior in Asynchronous Motor under External Input Conditions

Although numerous research advances have been made on asynchronous motors, particularly regarding internal parameters and complex control methods, the causes of the complex dynamic characteristics observed during normal motor operation have received less attention. To avoid abnormal vibration damage to the motor under normal operating conditions, the fluctuating nonlinear dynamic characteristics of the motor by considering variable voltages, frequencies, and changing workloads from both analytical and numerical perspectives are investigated. Motor stability was evaluated using the Lienard-Chipart stability criterion and the Runge-Kutta method. The results indicate that speed fluctuations occur within a specific range of input voltage and angular frequency, and the amplitude fluctuation region expands when load variation is considered. Furthermore, the Poincare map and Lyapunov exponent are adopted to determine the oscillation distribution and dynamic characteristics in a typical region. Specifically, the chaos phenomenon mostly occurred at the edge of the unstable region with an increase in the load. In contrast, periodic conciliation is mainly concentrated within the unstable region.