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Simulation of the acoustic behavior of an electric motor
Electromagnetic, structural dynamic and acoustic 3D simulation of an asynchronous motor in Ansys with slanted rotor slots

Analysis of the acoustic behavior of an asynchronous motor with Ansys

Sector: Electrical engineering/electronicsSpecialist field: Acoustics, Electromagnetics, Structural mechanics

CADFEM analyzed the acoustic behavior of a single-phase AC motor with slanted rotor slots for Elektromotorenwerk Grünhain (EMGR).

Summary

Task

By coupling electromechanical, structural dynamic and acoustic analysis, the acoustic behavior will be simulated in order to develop modification proposals for reducing the operating noise.

Solution

The surface vibrations obtained for the sound-radiating housing parts can be output for Ansys by means of the macro library SBSound. In addition, the structure-borne sound level can be displayed over the entire frequency range. With the help of the WAON acoustics tool, the airborne sound propagation – on the basis of the FMBEM (Fast Multipole Boundary Element Method) – can be displayed on meshes located at user-specified distances from the electric motor.

Customer benefits

The noise reduction potential has been fully exploited, the design has been improved, and the electromagnetic interactions have been optimized.

Project Details

Task

Elektromotorenwerk Grünhain’s single-phase AC motor with slanted rotor slots is used for various applications. Market requirements demand a quiet operating noise. By coupling electromechanical, structural dynamic and acoustic analyses, the acoustic behavior can be simulated in order to develop modification proposals.


Customer Benefit

The noise reduction potential has been fully exploited, the design has received concrete suggestions for improvement, and electromagnetic interactions in the motor have been optimized.


Solution

A 3D simulation model with slanted rotor slots is generated to determine magnetic forces. In a transient electromagnetic simulation, the formation of the magnetic field in the rotating machine is calculated. The alternating magnetic forces acting on the inner radius of the stator are stored as a function of time and location. After the transformation of the forces into the frequency range, they serve as input for the subsequent frequency response analysis and are applied to the structural dynamic FE model. The surface vibrations obtained for the sound-radiating housing parts can be output for Ansys by means of the macro library SBSound. In addition, the structure-borne sound level can be displayed over the entire frequency range. With the help of the WAON acoustics tool, the airborne sound propagation – on the basis of the FMBEM (Fast Multipole Boundary Element Method) – can be displayed on meshes located at user-specified distances from the electric motor. Thus, spatial sound pressure distributions or sound power frequency responses can be simulated.

Images: © Elektromotorenwerk Grünhain (EMGR)


Head of Professional Development
Dr.-Ing. Marold Moosrainer

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