You are presented with multiple paper abstracts, alongside the associated literature review and chapter titles. Given the provided information, you are going to do a literature review. Please generate a coherent literature review that synthesizes the content, draws connections between different works, highlights major findings, and identifies any gaps in the existing research.

Literature Review Title: An Overview of Fault-Diagnosis and Fault-Tolerance Techniques for Switched Reluctance Machine Systems 
Chapter Title:  4) COORDINATES TRANSFORMATION 
1. Abstract of Cited Paper (BIB001):  This paper presents a new fault-tolerant technique, on the basis of the current Park's vector, which is applied to switched reluctance machine (SRM) drives. Open- and short-fault occur in the power converter switches. A proposed current Park's vector can diagnose these faults. In addition, A position of the short-fault in the asymmetric bridge converter can be detected using the proposed another method. The fault-tolerant controls are performed after a fault diagnosis. An open-fault tolerant control can perform considering the adjacent phase switches. A short-fault tolerant control can perform using remaining switch of fault phase. These fault occurrences can be identified in the affected motor phase. A simulation is performed with a four-phase SRM drive system, and the results are presented to verify the validity of the proposed method. 
2. Abstract of Cited Paper (BIB002):  In this paper a new on-line fault diagnostics technique of the occurrence of stator faults in an 8/6 Switched Reluctance Motor is proposed. To validate the proposed approach a dynamic model was developed in Matlab/Simulink environment, based on the utilization of a specific lookup table for each phase, obtained with FEMM. 
3. Abstract of Cited Paper (BIB003):  In this paper the inter-turn short-circuit fault diagnosis in a 4-phase 8/6 Switched Reluctance Motor is addressed. A new on-line technique for the diagnostics of the occurrence of inter-turn short-circuit faults at an early stage of development is proposed. The validation of the proposed approach is based on a dynamic model, developed in Matlab/Simulink environment.

Literature Review:
In AC machines, Park transformation is widely employed in fault diagnosis BIB003 . In BIB001 , phase currents of SRM i a , i b , i c , and i d are transformed to i ds and i qs through (11) and (12), known as d-q current patterns. where i a , i b , i c , and i d are the currents in the four-phase SRM; i ds and i qs are the transformed currents in d-q axis. Different current patterns contain open-circuit or and shortcircuit faults information. In the normal state, the current trajectory is a circle going counterclockwise. In the fault condition, the trajectory deviates from the normal shape. This feature distinguishes faulty and healthy conditions clearly without any additional switches or diodes. Not only phase currents but also drive signals can be transferred in d-q axis to detect inter-turn faults, given by where G A , G B , G C , and G D are the drive signals of the chopping switches. The mean values of the transferred drive signals G d and G q is not equal to zero in the inter-turn short-circuit fault BIB004 . The d-q transformation and current trajectory method are also employed in BIB002 to detect openand short-circuit faults called current Park's vector method.