Current sensorless vector controlled induction motor drive

Abstract

This paper presents a current sensorless vector controlled induction motor drive with only speed sensor present in the system. The same performance as that of normal vector control drives (which uses two current and one speed sensor) is achieved with the proposed current sensorless drive. Such an approach is suitable for applications, where speed sensor cannot be eliminated. Thus, elimination of current sensor results in reduction of cost, increases reliability, reduced size and noise immunity. A new current estimation algorithm is proposed in this paper. The current estimation algorithm, estimates the current in two phase stationary reference frame. The proposed current estimation technique can also be used as a fault tolerant algorithm for normal vector controlled drives in case of current sensor failures. The performance of the current sensorless drive using the proposed current estimation technique is verified through MATLAB/SIMULINK. Extensive simulation results are presented to confirm the effectiveness of the algorithm. The algorithm is also experimentally validated with the laboratory developed prototype and the results are presented. The prototype is built around a dSPACE 1104 controller board.

Improved Sensor Fault-Tolerant Control Technique Applied to Three-Phase Induction Motor Drive

“…The fault flags' status and the FDI's corresponding output are indicated in Table 1. The estimated signals can be implemented by applying suitable methods such as MRAS, Sliding mode observer (SMO),.. [19][20][21][22] for the estimated speed (𝜔 ̂); and machine modeling, Luenberger Observer (LO),.. [23][24][25][26][27] for the estimated current (𝑖 𝑆𝛼 ̂, 𝑖 𝑆𝛽 ̂). This paper applies the SMO and LO methods to simulate the estimated signals, and these sensorless techniques have been verified for stability by the Lyapunov function in the reference.…”

“…This method separates the two stages of error diagnosis and reconfiguration into two independent processes that facilitate their independent development. Paper [18] After correctly identifying the faulty sensor, FTC will isolate uncertain feedback signals and apply appropriate sensorless techniques, including speed sensorless [19][20][21][22] and current sensorless [23][24][25][26][27], to maintain IMD's operation. In this paper, in order to improve the stability, an improved FTC technique applying mathematical functions for diagnosing the operating status of sensors is integrated with the controller of IMD against the total current and speed sensor faults.…”

Operating of DSIM without Current and Speed Sensors Controlled by ADRC Control

“…Another method uses the reference values of stator current to estimate the stator current [23]. Other researches use predictive methods to estimate speed and stator current [24][25][26][27], this predictive methods have shown their robustness against disturbances and the variation of machine parameters.…”

A field-oriented control (FOC) method using the virtual currents for the induction motor drive

“…Using estimated line-currents has ensured stable operation of IMD under current sensor fault states. In [22], A new CSL method is applied for estimating the stator current from the rotor flux variable and voltage signal in [α, β] coordinate. In this way, the speed of IM is controlled through the FOC loop with only a feedback speed signal of the encoder.…”