Inter‐turn fault diagnosis of permanent magnet synchronous machine based on tooth magnetic flux analysis

Abstract

This study proposes a novel inter-turn fault diagnosis method for a permanent magnet synchronous machine. Search coils are set on every stator tooth to measure the tooth fluxes. The high-order harmonics produced by the inverter are adopted to diagnose the inter-turn fault existence and locate the fault tooth. The fault severity coefficient is proposed on the basis of theoretical analysis and can identify the fault severity. A comparative analysis of a traditional method based on co-simulation shows that the proposed method is sensitive and that the fault severity coefficient is accurate, intuitive and independent of the operating condition of the motor. An experimental platform is set up, and it validates the effectiveness of the proposed method.

A Methodology for Remote Sensing Inter-Turn Fault Events in Power System Air-Core Reactors, via Simulation of Magneto Quasi-Static Fields in 2D FDTD

“…where j is the location index of position y, and integration for each wire turn begins at y j_s and ends at y j_e . The MQS 2D FDTD voltage solution V FDTD may be scaled to the equivalent circuit solution V FDTDscaled by using the voltage scaling factor S V in (12), with S V given in (13), wherein the assumption d c r w is implicit.…”

“…An independent, but somewhat related, area in power networks that often requires electromagnetic modeling and analysis of solenoids is the rotating machines which have been the subject of a lot more analysis [9]- [12] due to their existence in much larger quantities and their higher economic value. Although, reactors and rotating machines are devices with different dimensions and applications, previous works may provide useful insights about the state of computational electromagnetic (CEM) modeling in dense coils of wiring, at 60 Hz.…”

Fault coil location of inter‐turn short‐circuit for direct‐drive permanent magnet synchronous motor using knowledge graph

“…In this method, multiple search coils are installed on the outer surface of the stator, and the stray flux detected by the search coil can locate the faulty coil. In [25], a tooth flux‐based method is proposed. In this method, search coils are installed on each tooth, and the fault coil can be located by the tooth flux detected by the search coils.…”

Scheme for synchronous machine stator turn‐to‐turn protection

“…These faults are the second most likely to occur in electrical generation, right after the earth faults. However, the turn-to-turn fault detection is not limited to synchronous machines, while it consists of an important aspect in other power devices such as the power transformers [6][7][8], permanent magnet synchronous motors [9][10][11][12], brushless DC motors [13], and asynchronous machines [14][15][16][17].…”