Abstract
Due to the complex structure and wide excitation of the range extender, the misalignment and stator short-circuit coupling fault can easily occur. Therefore, it is necessary to study the coupling fault mechanism of the range extender, analyze the cause of the fault and the fault evolution law, and research the coupling fault characteristics. To reveal the mechanism of misalignment and stator-short-circuit coupling fault, the misalignment mechanism was analyzed and the bending and torsion electromagnetic stiffness of the generator in the stator short-circuit fault was derived. Then the dynamic model of bending and torsion coupling for the generator was established. Furthermore, we used the Runge-Kutta method to study the vibration response characteristics of generator rotor under coupling fault. Then through finite element analysis, the feasibility of coupled fault diagnosis was verified. The results show that the response of the generator rotor not only has the frequency component of single faults, but also new frequency components such as 4.0 and 6.0 harmonic amplitudes of radial vibration and 3.0 harmonic amplitudes of torsional vibration, respectively.
Highlights
IntroductionAs a smooth transition model from the hybrid electric vehicle to a pure electric vehicle, the Range
As a smooth transition model from the hybrid electric vehicle to a pure electric vehicle, the RangeExtended Electric Vehicle (REEV) is of significant interest because of the high efficiency, small battery capacity and long driving mileage
The torsional vibration and radial vibration response characteristics of the coupled fault system are analyzed by time domain diagram and frequency spectrum diagram
Summary
As a smooth transition model from the hybrid electric vehicle to a pure electric vehicle, the Range. Wu analyzed the vibration characteristics of the generator caused by the inter-turn short-circuit using the magnetic density method and the energy method [18]. Ma theoretically analyzed the generator vibration characteristics caused by stator inter-turn short-circuits using the magnetic density method and energy method [20]. Based on the analysis of the misalignment fault excitation mechanism and derivation of the generator electromagnetic stiffness under a stator short-circuit, a dynamic model of the rotor system of the generator of range extender is established in this paper. This paper has studied the law and characteristics of rotor vibration response during the coupling fault of misalignment and stator short-circuit It provides a theoretical basis for motor fault diagnosis and prevention
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