Abstract
ABSTRACT A Digital Signal Processor (DSP) based voltage-fed Insulated Gate Bipolar Transistor (IGBT) inverter that drives a three-phase induction motor is presented. The selected DSP, a TMS320C14 chip by Texas Instruments, controls the PWM operation of the inverter. A host IBM PC is connected to the DSP through an RS-232 serial interface for data communications to and from the DSP. IGBTs are used in the inverter because of their characteristically low conduction losses, small switching delays and simplified gate drive circuit. A harmonic elimination scheme is adopted as the PWM strategy to eliminate four low-order harmonics in the inverter output. The inverter performance is tested using a 1 HP, three-phase induction motor. The output waveforms are recorded and the harmonic spectra are developed using a FLUKE 41 power harmonics analyzer and the results show decidedly suppressed low-order harmonics. The design also highlights the simplicity and cost effectiveness of the DSP based modulator and IGBT based inverter design.
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