Analysis and detection of turn‐to‐turn short circuit fault in a permanent magnet Vernier generator based on modified winding function

Abstract

Operation of Vernier machines is based on flux modulation. They have some advantages including maintaining the rated torque in motor applications and the rated output power in generator applications at low speeds, high torque density and relatively low torque ripple due to their magnetic gear property and fault-tolerance. In recent years, the motor with various topologies has been developed for different applications. Therefore, analysing and monitoring different faults is essential in the design and implementation stages. This study has two main purposes. First, to introduce an accurate frequency index independent of load variations for detecting the turn-to-turn short circuit (TTSC) faults in the stator windings of a permanent magnet Vernier machine. Second, modelling the machine in a healthy condition and in the presence of TTSC faults to investigate its effect on machine performance and output characteristics. An analytical model is presented using the modified winding function theory under the TTSC fault by taking into account the effect of stator slots which enhances the accuracy of the air-gap permeance function estimation. In the process of calculating the fault index, frequency components of the output characteristics of the machine are obtained from the mathematical equations of the magnetic field. It is shown that the proposed indicators are robust against load variations.

Single stator‐single rotor permanent magnet Vernier machine topologies for direct‐drive applications: Review and case study

“…Experimental evaluation of prototype: (A) stator and (B) rotor 56 F I G U R E 2 8 Experimental results of prototype, (A) induced voltages, (B) rated phase current (resistive load) 57 PF Ver ¼ Cosφ ver ¼…”

“…Experimental results of prototype, (A) induced voltages, (B) rated phase current (resistive load) 57 …”

State feedback method of inter-turn short circuit in rotor winding of induction motor based on improved association rule algorithm

“…Motor faults in power systems can have significant impacts on the performance and reliability of asynchronous generators, particularly affecting the motor rotor winding. The occurrence rate of faults in the motor rotor winding is generally higher when compared to faults in other components of the motor system [1]. Abnormal motor vibration can be an indication of faults in the rotor winding.…”