Performance Characterization and Torque-Ripple Reduction in Induction Motor Adjustable Speed Drives Using Time-Stepping Coupled Finite Element State Space Techniques
Format of Original
Institute of Electrical and Electronics Engineers (IEEE)
Conference Record of the 1998 IEEE Industry Applications Conference. 33rd IAS Annual Meeting
In this paper, the time-stepping coupled finite element state space (TSCFE-SS) model developed in the first of two companion papers is applied here for the assessment of effects of machine geometry and magnetic circuit design modifications and the effects of pulse-width modulation carrier frequency on the performance characteristics of induction motor drives. Namely, this has been accomplished through analysis of developed torque profile ripples and harmonic spectra of mid-airgap radial flux density waveforms of the case-study motor. Furthermore, consequent effects of design modifications pertaining to, geometry and/or magnetic circuit modifications, and pulse-width modulation carrier frequency on ohmic and iron core losses are investigated. The investigation has been performed on a case study motor which is a Y-connected, single-layer, 3-phase, 2-pole, 1.2-hp, 208 Volts squirrel-cage induction motor with 24 stator slots, and a cage with 34 rotor bars.