Mechanical material properties for structural simulation model of switched reluctance machines

Modal Analysis and Rotor-Dynamics of an Interior Permanent Magnet Synchronous Motor: An Experimental and Theoretical Study

“…It should be noted that one of the goals of this study was to investigate whether an accurate and fast mechanical vibration analysis can also be done with adequately simplified geometrical and mechanical material properties of the real IPM windings. A simplified stator geometry model was therefore built in the form of solid bodies of slot and end-windings (as shown in Figure 1e) with equivalent mechanical material properties of composite materials assigned based on the experimental and numerical data found in the literature [9]. The accuracy of the modal analysis results was controlled by comparing the numerical results to the experimental measurements performed on the real IPM stator with the distributed windings.…”

“…All the mechanical material properties for all motor components were considered as homogeneous and isotropic (i.e., core lamination was neglected). The mechanical material properties such as Young's modulus E, mass density ρ and Poisson's ratio of the slot windings and the end-windings were defined in our model based on previous experimental and numerical studies of similar mechanical structures [9]. The mechanical material properties of ferromagnetic material M270-35A (Cogent Power Ltd, Surahammar, Sweden) and permanent magnets NdFeB (Arnold Magnetic Technologies AG, Lupfig, Switzerland) listed in Table 2 were taken from the manufacturer data sheets.…”

“…Such complete mechanical analysis should include both static modal analysis for vibration analysis of geometrical and material properties of the machine components and the rotor dynamics in order to investigate the vibration of the rotating parts. The modal analysis of the machines' stator has already been extensively reported for different types of electrical machines [5][6][7][8][9][10][11][12][13][14], while the rotor dynamic has mostly studied for the mechanical design of high speed machines constructed for special applications [1,2,4,[15][16][17][18][19][20][21][22][23][24][25]. To the best of the authors' knowledge, the complete mechanical analysis of the stator and rotor components of the same machine by the modal and rotor dynamic analysis has not been reported.…”

Source of Acoustic Noise in a 12/16 External-Rotor Switched Reluctance Motor: Stator Tangential Vibration and Rotor Radial Vibration

“…As an example, the difference in the natural frequencies of the radial vibration mode two of the stator and rotor for several IR and ER SRMs are presented in Table 1. The material properties for the modal simulation in the 8/6, 6/4, 6/14, 24/16 IR SRM, 18/24, 12/16 ER SRM are 0.285 for Poisson's ratio, 7.6 g/cm 3 for mass density, and 175 GPa for Young's modulus, which were calculated using the method provided in [16] and the properties of the winding and lamination steel material provided in [17] and [18], respectively. It should be noted that radial vibration mode two is not excited in all these SRM topologies.…”

“…16 ER SRM stator pole tangential vibration mode, modeled as a cantilever; (a) geometry, (b) first tangential vibration mode shape.…”