Analysis of the Frequency Characteristics of a Three-Phase Induction Motor

In this paper, we discuss the frequency characteristics of a three-phase induction motor theoretically and take up the transfer functions on. the speed variation to the small variation of supply voltage, supply frequency, and load torque. The frequency responses are affected considerably by the electrical time constant at the range of, high signal frequency, but these transfer functions may be approximated by the form of a first-order lag element as the value of mechanical time constant or the slip of a tested induction motor increases.