Control system with the set point observation

The Influence of Supply Voltage Amplitude Variation Law on AC Induction Motor Efficiency in Variable-Speed Drive

“…The motor was fed from the experimental example of the developed frequency converter. The Space Vector Pulse Width Modulation (SVPWM) method modification presented in [4] is used for formation of the voltage in this frequency converter. The investigation has been performed in the range of f p from 15 Hz to 50 Hz at the nominal 13 Nm motor load and decreased 6.5 Nm, 3.25 Nm loads.…”

“…One of the main problems in the development of frequency converters is to maintain the required law of voltage amplitude variation. There are two main amplitude variation laws that are widely used at present [1][2][3][4][5][6]: linear A 1 =k l f p and square A 1 =k s f p 2 , where k l and k s are proportionality coefficients. It is recommended to use the first law in the case when the motor is loaded by the torque, which is close to nominal and is independent on the motor rotation velocity (independent on f p ), the second one -in the case when it decreases with f p .…”

Modeling of a Mechatronic System with the AC Induction Motor Supplied by the Frequency Converter

“…1 for simplicity). The IGBT transistors V At -V Cb commonly used as power switches are controlled by an algorithm, and which is executed in the control unit to create the proper AC waveforms [4].…”