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Introduction and Overview Inverters are used to create single or poly-phase AC voltages from a DC supply. The DC supply is typically created by rectification of AC voltage from the utility power grid with due consideration of harmonics and input power factor. In the class of poly-phase inverters, three-phase inverters are by far the largest group. A very large number of inverters are used for adjustable speed motor drives for motors ranging from fractional hp (horsepower) to several 100 hp. Considering that more than 50% of all the electricity generated in the United States is used to drive electric motors [25, Figure 8.3], the importance of this application cannot be overstated. The typical inverter for motor drives is a “hard-switched” voltage source inverter producing pulse-width modulated (PWM) signals with a sinusoidal fundamental [11]. For large motors, multilevel inverters [19,24] are used, which are described in more detail later. Recently, research has confirmed and explained
Original languageEnglish
Title of host publicationInverters
PublisherCRC Press
StatePublished - 2012


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