2. Variable-frequency power supply

2.1 Waveforms

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2.1.1 Principle

Today, asynchronous machine speed variation is mainly achieved by varying the stator frequency of cage-type asynchronous machines. Current inverters or switches, once used for forced commutation, are no longer used since the emergence and development of semiconductors controlled on both opening and closing (IGBT: insulator gate bipolar transistor, GTO: gate turn off...). The vast majority of inverters with asynchronous machines use the two-level voltage inverter, consisting of three identical...