Diagnosis and detection of dynamic eccentricity fault for permanent magnet transverse flux generator

Abstract

The authors analyse no-load and full-load performance of a permanent magnet transverse flux generators (PMTFGs) in fully aligned condition as well as under different types of mechanical faults including static eccentricity (SE), dynamic eccentricity (DE), inclined rotor (IR) and run-out (RO) faults. An analytical model is developed to calculate the airgap permeance. This permeance is used to estimate the flux density and backelectromotive force in the healthy and faulty machine. Performance of the machine is predicted using the proposed analytical model and verified by comparing it with the results obtained using three-dimensional time stepping finite element method. Finally, the spectra of stator current in the PMTFG under SE, DE, IR and OR faults are determined through which the amplitude of side-band components with a specific frequency pattern is extracted. It can detect the eccentricity fault precisely, recognise its type and determines its severity.This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

A Review of Transverse Flux Machines Topologies and Design

“…Surface-mounted magnets are usually glued on the external or internal edge of the rotor-depending on whether the rotor is internal or external, respectively-but they can be also be glued to the stator cores [61,76,[107][108][109], inserted in a disk-rotor [81,110,111] or embedded in the rotor teeth [112,113].…”

“…Finally, a structural analysis is made mapping the axial force and using FEM, and axial acceleration, noise and cogging torque are experimentally measured. In [111], an analysis of the eccentricity is made, this includes static eccentricity, dynamic eccentricity, inclined rotor and run-out faults. Eccentricity faults are caused by inner machine defects, whereas torque oscillations are usually generated out of the machine.…”

Prototype of a Two-Phase Axial-Gap Transverse Flux Generator Based on Reused Components and 3D Printing

“…Mechanical stability is also a critical aspect when manufacturing electric machines with disk-shaped rotors, as the high value of their diameter-to-length ratio make them to be strongly exposed by the inclined rotor fault [23]. In [24] the vibration and noise response of the TFMs proposed in [11,25] is measured with the help of an accelerometer and a microphone.…”

“…In [24] the vibration and noise response of the TFMs proposed in [11,25] is measured with the help of an accelerometer and a microphone. Static and dynamic eccentricities of the TFM proposed in [9] are further studied in [23], and the severity of a dynamic eccentricity is evaluated experimentally.…”