Abstract
An accurate prediction of modal characteristics of motor stator is essential in order to design a low vibration motor and to operate it quietly. Scholars have done a lot of research on the modal analysis of stator core and winding. However, there are few papers for the 0th-order mode shape and frequency of the stator system. This paper aims to propose a new stator system analysis model, which can effectively analyze the 0th-order mode and improve the model calculation efficiency. Firstly, the modal of stator core and stator core-winding system were analyzed theoretically. Secondly, four stator system finite element analysis models were established. The modal analysis of the stator core and stator core-winding system were carried out using the four models. The validity and computational efficiency of the four models of the stator core and stator core-winding system were compared. A new stator system analysis model was proposed. Thirdly, the modal tests of the stator core and stator core-winding system were carried out by hammering method, and the validity of the finite element analysis model was verified. Compared with the traditional model, the newly proposed model can analyze the 0th-order mode more effectively and improve the computational efficiency.
Highlights
As motor design is key to the development of electric vehicles (EVs) and hybrid EVs (HEVs), it has recently become the subject of considerable interest [1]–[3]
According to the existing literature, when the winding is equivalent to the model of additional mass, the 0th-order mode shape of the stator core shows good, but the contribution of the stiffness of the winding cannot be considered, and the deviation of the calculation result is large; when the winding is equivalent to a continuous entity, a large number of local modalities are generated, which reduces the efficiency of modal analysis
This paper aims to propose a new stator system analysis model, which can effectively analyze the 0th-order mode, reduce the number of local modes caused by the stator winding equivalent model, and improve the model calculation efficiency
Summary
As motor design is key to the development of electric vehicles (EVs) and hybrid EVs (HEVs), it has recently become the subject of considerable interest [1]–[3]. Comparing the results of 3-D finite element analysis and experimental measurements, the equivalent Young’s modulus of the isotropy laminated stator core and the windings are obtained. In paper [16], the material properties of the orthotropic laminate structure and the windings were determined by finite element analysis and experimental measurements, and compared with the measured results. According to the existing literature, when the winding is equivalent to the model of additional mass, the 0th-order mode shape of the stator core shows good, but the contribution of the stiffness of the winding cannot be considered, and the deviation of the calculation result is large; when the winding is equivalent to a continuous entity, a large number of local modalities are generated, which reduces the efficiency of modal analysis.
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