{'fraction_non_alphanumeric': 0.02912621359223301, 'fraction_numerical': 0.009708737864077669, 'mean_word_length': 5.406779661016949, 'pattern_counts': {'":': 0, '<': 0, '<?xml version=': 0, '>': 0, 'https://': 0, 'lorem ipsum': 0, 'www.': 0, 'xml': 0}, 'pii_count': 0, 'substrings_counts': 0, 'word_list_counts': {'cursed_substrings.json': 0, 'profanity_word_list.json': 0, 'sexual_word_list.json': 0, 'zh_pornsignals.json': 0}}
Performance characterization and torque-ripple reduction in induction motor adjustable speed drives using time-stepping coupled finite element state space techniques

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.