Universal acoustic modelling framework for electrical drives

Abstract

The interdisciplinary task of assessing the acoustic characteristics of electrical drive-systems gains importance in traction, industrial and consumer applications. This study presents a universal acoustic modelling framework for efficient, high-quality acoustic modelling of electrical drives. The objective is to make drive acoustic modelling and assessment of an integral part of drive-system design. The approach integrates directly into the general drive-system design process and can be applied to all types of machines (synchronous, induction, switched reluctance and direct current). Inverteroperation-related switching frequencies and spatial machine harmonics are routinely taken into account. The process is applicable to machines with rotor or stator skew as well as to outer-rotor and transversal-flux machines. It combines the two fast and user-interactive steps system simulation and vibration synthesis. The underlying model parameters are obtained via automated offline finite-element simulations based on generic input parameters. This allows using complex electromagnetic and structural models without computation time becoming prohibitive. Application examples are given for permanent magnet synchronous machine traction drives for (hybrid) electric vehicles as well as a for a switched-reluctance auxiliary drive. Simulated run-up spectrograms for structure-borne sound are validated against measurements and operational deflections are presented.

Prediction of acoustic noise and vibration of a 24/16 traction switched reluctance machine

“…As discussed in the previous section, the harmonics with a spatial order of 0, 8, 16 are the major harmonics that lead to vibration and acoustic noise in the 24/26 SRM at 2000 rpm. The damping ratio used in the simulation of vibration and acoustic noise is calculated by [5] ζ circ = 1 2π 2.76 × 10 −5 f circ + 0.062 (13) where ζ circ is the modal damping ratio, f circ is the natural frequency of the mode circ. An averaged damping ratio is used in this paper by averaging the modal damping ratio of the vibration mode circ = 0 and circ = 8.…”

“…The effect of winding and housing has not been considered in [12]. A precise modelling of vibrating structure and the meshing of the structure were not reported in [12][13][14][15].…”

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.…”

Technology, Research and Applications of Switched Reluctance Drives

“…A universal acoustic modeling framework for electrical machines is introduced in [65], [71]. The structure of the framework is shown in Fig.…”