Evaluation and comparison of two types of induction-motor drives

The evaluation of steady-state performance and the design methods for variable-speed inverter-fed induction-motor drives suitable for different industrial applications are complex. The nonlinear variation of the drive-system performance indices with frequency and filter parameters, the presence of special performance indices such as pulsating harmonic-torque components, the depletion of breakdown torque, and deterioration in the performance as low frequencies are approached etc. necessitate a completely different approach to the design of these drive systems as compared to the design of conventional single-speed machines. This paper is an attempt to evaluate and compare two types of optimal inverter-fed variable-speed induction-motor drives suitable for two different industrial applications. Digital-computer solutions for the results are presented.