Accurate modelling and modal analysis of stator system in permanent magnet synchronous motor with concentrated winding for vibration prediction

Abstract

This study investigates the accurate modelling and the modal natural frequencies of the stator system of a permanent magnet synchronous motor with concentrated winding used in the in-wheel motor system of the electric vehicle. The equivalent material physical properties of each component in the stator system are determined by the correction formula and the empirical coefficient. Meanwhile, the contact conditions between each component are also analysed. According to the structural analysis of stator system, different equivalent finite-element models of winding and frame, together with their effects on the accuracy of simulation results, have been built and investigated, respectively. In addition, the prototype of the motor is fabricated; then the experimental modal analysis of the stator system and its subassemblies are carried out during the manufacturing process. Through comparisons of the results between experiments and finite element anaysis (FEA), the final model of the stator system is determined and verified to be of high accuracy to predict the vibration behaviours of the investigated motor with concentrated winding. Finally, several factors influencing the modal frequencies of stator system are analysed, which could provide certain reference value to the structural design of stator system.

Analysis of Modal and Vibration Reduction of an Interior Permanent Magnet Synchronous Motor

“…It can be observed from (10) and (11) that the orders of the electromagnetic force wave of the integer slot motor can only be zero or the integral multiple of the number of poles. The number of poles of the prototype motor is 6 in this paper, low orders of the electromagnetic force wave are 0th and 6th, and the others are integer multiples of six.…”

“…The authors calculated the natural frequencies of the motors and their parts in [6,7] and modal analysis of a stator with a complex shape in the induction motor was carried out in [8]. In addition, the influence of various parts of a motor on the natural frequency of the whole motor was studied in [9][10][11][12]. References [9,10] primarily analyzed the natural frequencies of the stator and the stator with casing, and the influence of end caps on the natural frequencies of the stator was considered [10].…”

“…References [9,10] primarily analyzed the natural frequencies of the stator and the stator with casing, and the influence of end caps on the natural frequencies of the stator was considered [10]. Modal analysis of the stator core was conducted in [11,12], and [11] focused on the stator in PMSM with concentrated winding, and the stator structure of the PMSM for electric vehicles was researched in [12]. This study considered the impacts of the windings and winding ends on the natural frequency of the stator core, and the correctness of the finite element calculation results was verified by modal test.…”

Parameter Equivalent Method of Stator Anisotropic Material Based on Modal Analysis

“…By measuring the stator mass of 3 kg, according to the relationship between mass and volume, the actual density of the calculated stator core was 7680 kg/m 3 . We first referred to the material properties in the relevant literature and then converted them according to the Voigt-Reuss formula [22,23]. The approximate parameter initial value was set as shown in Table 2.…”

New Equivalent model and Modal Analysis of Stator Core-Winding System of Permanent Magnet Motor With Concentrated Winding

“…The stator is treated as homogeneous orthotropic laminate structure material, the recommended fitting curve is used to obtain material property parameters [6]. In paper [7], the laminated stator core is assumed to be modeled as a continuous solid with composite material, of which the equivalent Young's modulus is calculated by the Voigt-Reuss formula. In addition, since the circumferential modes have a major contribution in vibration generation, the equivalent material properties assigned to the stator core are isotropic.…”