Fault-Tolerant Sensorless Sliding Mode Control by Parameters Estimation of an Open-End Winding Five-Phase Induction Motor

Abstract

Open-End Winding Five-Phase Induction Motors (OEW-FPIM) can offer high degree of faults tolerance, reduced common-mode voltage and high torque density. These motors are placed in varying environments and conditions that ultimately reduces the motor efficiency and later leads to failure. This paper proposes a fault-tolerant sensorless sliding mode control based on a parameters estimation (stator resistance, stator inductance and mutual inductance between the stator phases and the rotor phases) of OEW-FPIM with the ability to run the system disturbance-free before and after a short circuit fault between turns. The proposed estimation scheme is intended to improve the system performance even in the fault condition. In addition, a sliding mode observer (SMO) is used to estimate the rotor speed. The simulation results of the proposed sensorless control under a short circuit fault between turns, wherein we demonstrate the effectiveness of the proposed strategy.

Sensorless Field-Oriented Control for Open-End Winding Five-Phase Induction Motor With Parameters Estimation

“…Many control techniques have been used for the OESW-FPIM such as the field-oriented control [14], direct torque control [15], backstepping control [7], and sliding mode control [16]. The FOC technique is an attractive solution due to its simplicity and maturity as it offers high dynamic performance by means of independent torque and flux adjustment within a very wide range of speeds [16], [17]. Unfortunately, FOC technique has the major disadvantage of being sensitive to motor parameters variation and load torque disturbances [17].…”

“…In this regard, speed sensorless control reduces the number of installed sensors, the additional electronic circuits, the connection cables, and the mounting space [7]. Consequently, the overall cost, size, and maintenance requirements are minimized, while the system robustness and reliability are enhanced even when operating in hostile environments [7], [16]. Owing to this, the sensorless control methods have received great attention during the last decades, particularly three-phase motor drives [17]- [24].…”