Correction on Current Measurement Errors for Accurate Flux Estimation of AC Drives at Low Stator Frequency

Robust measurement disturbance observer design for AC motor drive systems with current measurement errors

“…In this situation, the measured d-and q-axis currents in the synchronous frame are i1 AD=i1+Mascos8+~(Mas+2Mb. )Sin8 (1) i;s_AD =i;s -M as sin8+~(Mas +2Mbs)cos8…”

“…However, the nonlinearity of current sensors and Op-Amps, thermal drift of measurement resistors, the quantization error and nonlinearity of AID converters result in DC offsets and scaling errors. It causes fluctuations of the motor torque and generates speed oscillations of fundamental and double fundamental frequency [1][2]. This results in the deterioration of the performance of the motor drive system because they act as a disturbance load.…”

“…In the vector control, a precise current measurement is necessary to achieve a high static and dynamic performance since the vector control is based on the current control [1][2]. Currents are measured through current sensors, Op-Amps, measurement resistors and AID converters.…”

Steady-State Performance Degradation of a DTC IM Drive Under Parameter and Transduction Errors

“…Similar degradations are encountered in the FOC IM drives even if, here, the processing of the transduced variables and, hence, the involved parameters and algorithms is different. Manuscript Whereas this topic is well documented for the FOC IM drives [4]- [8], only a few papers have faced it for the DTC IM drives [9]- [12]. Furthermore, the existing papers limit themselves either to report the degraded drive behavior or to arrange corrective techniques.…”