Abstract
Evaluation of the external magnetic field parameters allows determining the technical condition of the automobile alternator with minimum labour intensity and sufficient informativity. However, measurement of the external magnetic field magnitude with Hall sensor doesn’t allow expressly recognizing an occurring fault. It has been established that the spectral decomposition of external magnetic field oscillogram significantly increases informativity of this diagnostic parameter. Indicating harmonics, which extreme value allows identifying the technical condition of the automobile alternator, are distinguished. The article materials can be used for further development and implementation of the automobile alternator diagnostics based on the parameters of the external magnetic field.
Highlights
IntroductionThe classification is based on the following features: measured parameters (structural, operating and associated processes); measurement principle (subjective and instrumentation); determination method (requiring removal from the automobile and disassemble or not); diagnostic devices (external, integrated and on-board) [1, 2, 3]
To increase informativity of this diagnostic parameter spectral analysis of the external magnetic field oscillogram was performed with the function of fast Fourier transform integrated into the oscillograph
For practical use of the spectral analysis as a automobile alternator diagnostics method the following shall be detected: which harmonic components will be an indicator of a particular fault
Summary
The classification is based on the following features: measured parameters (structural, operating and associated processes); measurement principle (subjective and instrumentation); determination method (requiring removal from the automobile and disassemble or not); diagnostic devices (external, integrated and on-board) [1, 2, 3]. The structural parameters directly associated with the alternator serviceability can be detected only by the direct methods Such parameters can include the following: electrical resistances of stator and rotor windings, interturn and groundwall insulation, semiconductor diodes; diameter and contact ring runout; brush height; bearing play, etc. One more disadvantage of the direct diagnostics methods consists in that upon operation completion alternator bench tests are required, as only check of the output parameter conformity to the technical standards allows installing the alternator back on the automobile
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