A Novel Technique for Fault-Tolerant Control of Single-Phase Induction Motor

Abstract

This research discusses about vector control of single-phase Induction Motor (IM) with two main and auxiliary windings under stator winding open-phase fault based on Indirect Rotor Flux-Oriented Control (IRFOC). IntroductionSingle-phase Induction Motor (IM) is one the most commonly IMs which is used in washing machines, drills, compressors, refrigerators, pumps, dryers and many other applications. A single-phase IM is principally an unbalanced IM since it is constructed with two unequal main and auxiliary windings [1].AC drives of single-phase IM demonstrate better performance, lower protection, improved reliability and are cost-benefit in comparison with their DC counterparts [2,3]. In the literature, numerous studies have been conducted on Variable Frequency Control (VFC) techniques of single-phase IM drives such as scalar and vector control techniques. These control techniques assure energy saving, improved efficiency, decrease in torque response pulsation and etc [4][5][6][7][8]. Recent research trend on IM is toward vector control of single-phase IMs or unbalanced two-phase IMs [9][10][11][12][13][14][15][16][17][18][19][20][21][22]. Generally, in all proposed vector control methods for single-phase IMs, the start-up and running capacitors are disregarded and single-phase IM is considered as an asymmetric 2-phase IM. Use of hysteresis current controller for Field-Oriented Control (FOC) of unbalanced 2-phase IM has been suggested in [9]. In [10], FOC technique for a single-phase IM with current double sequence controller for decreasing the torque pulsation has been proposed. Using current double sequence controller is a complex controller due to using many PI controllers. To solve problems in [9,10], in [11,12], decoupling vector control of single-phase IM has been presented. In [11,12], by introducing two new decoupling signals in addition to the decoupling signals like ones used in 3-phase IM, a novel technique for vector control of single-phase IM based on FOC has been proposed. However, decoupling vector control technique depends on variation of single-phase IM parameters. In [13][14][15][16][17][18][19][20][21][22], some methods for high performance FOC of single-phase IM or unbalanced 2-phase IM have been presented which can be listed as follows; In [13][14][15][16], speed sensorless Indirect FOC (IFOC) of 2-phase IM using Extended Kalman Filter (EKF), in [17], Model Reference Adaptive System (MRAS) observer for rotor speed estimation, in [18], sensorless FOC of single-phase IM with on line stator resistance estimation, in [19,20], two techniques for speed sensorless IFOC of unbalanced 2-phase IM based on motor model, in [21], FOC of 2-phase IM using Genetic Algorithm (GA) for speed PI controller tuning and in [22], Virtual High Frequency Injection Method (VHFIM) to determine the speed and position in IFOC of 2-phase IM have been presented.