{'fraction_non_alphanumeric': 0.017488076311605722, 'fraction_numerical': 0.009538950715421303, 'mean_word_length': 5.0, '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}}
Three-Phase AC Variable Frequency Speed Adjustment Controller Based on FPGA

In the paper, the three-phase ac motor is used as the controlled station and the FPGA device EP1C3T144C8 is adopted as the control core. Aiming at the flexibility of the variable frequency system based on SPWM, the DDS technique is introduced. The process of speed adjustment is conducted by AC motor by the three-phase supply with tunable frequency generated by inverter switch device based on SPWM signal. With rational structure and simplified design, this project can generate stable SPWM signal, high frequency resolution and fast switching speed.