{'fraction_non_alphanumeric': 0.017064846416382253, 'fraction_numerical': 0.0, 'mean_word_length': 5.518518518518518, '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}}
MTPA Control of IPMSM with Online Parameter Estimation

A high efficiency control of interior permanent magnet synchronous motors (IPMSM) with online parameter estimation is proposed in this paper. It is known that for high efficiency driving, it is necessary to control the armature current phase accurately. On the other hand, the optimal armature current phase is determined by the motor parameters. However, it is difficult to obtain the accurate motor parameters during driving because of magnet saturation, inductance variation and parameter dependency on temperature. In this paper, an online parameter estimation method by applying the recursive least squares method is proposed. The usefulness of the proposed method is verified by efficiency comparison between the maximum torque per ampere (MTPA) control using online estimated parameters and using nominal parameters.