Identification of the Operating Modes in Single-Phase DC Drives

Öz

In this study, operating modes of controlled single-phase rectifier-driven direct current (DC) drives were investigated. It was observed that the motor performance exhibited different behaviour depending on the combined interaction of the rectifier firing angle, motor parameters, motor load (or speed), supply voltage and frequency. It can be said that the voltage across the motor and the current through the motor take different waveforms in each of these different states, which are named drive operating modes in this study. Furthermore, analysis and simulations were conducted for two different types of drives: a) Single-phase fully controlled bridge rectifier drive (FCBRD) and b) Single-phase half-controlled bridge rectifier drive (HCBRD), including a freewheeling diode. As a result, the motor current waveform exhibits seven distinct operating modes, each performing different characteristics when driven by two types of rectifier circuits. On the other hand, the mathematical models of these seven modes were also presented in this study. The actual time variations of voltage across and current through the motor armature and the total harmonic distortion (THD) were presented through simulations for each mode using the obtained mathematical models in MATLAB.

Anahtar Kelimeler

• DC drives
• operating modes
• performance analysis
• phase-controlled rectifiers
• total harmonic distortion.

Kaynakça

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