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Structural mechanics

Noise Computation for Electrical Drives

The Ansys NVH workflow for electrical machines


Training Expert

Learn how to calculate the electromagnetically induced vibration and noise emitted by electric motors using Ansys tools. This training is offered as a 2-day course.

2 days

Basic knowledge of Ansys Maxwell, Basic knowledge of Ansys Mechanical

Software used
Ansys Maxwell, Ansys Mechanical

  • Determine noise level for the entire rpm range
  • Identify critical frequencies and rpms of the electric motor
  • Understand motor design and its typical air gap force waves
  • Combined analysis of the noise from the motor and drive train


Today, a limited noise level is seen as a common quality and performance feature of the electrical drive. Vibration and noise of motors are mainly caused by the magnetic force effects that occur in the air gap between the stator and rotor. Anticipating these forces and the resulting motor vibration allows you to a) compare different variants at an early stage in the design process, b) be informed about acoustic lab measurements, and c) shorten painstaking prototype phases.

This training shows you how to calculate noise-intensive operating points and frequencies of an electric motor using FE methods.

The calculation procedure integrated in the Ansys environment includes the following three subsections: electromagnetic analysis to calculate air gap forces, structural dynamic vibration analysis including the calculation of structure-borne noise power, and airborne sound analysis for the calculation of the sound field. The analysis of air gap forces will be covered in depth. You will also learn how to avoid typical errors in modeling and how to generate high-quality results.

Detailed agenda for this 2-day training

Day 1

01 Introduction to NVH analysis

  • techniques Overview of simulation methods
  • What result do I need and what is the appropriate tool?
  • What is Equivalent Radiated Power (ERP)? What is airborne noise? What are the differences?
  • Introduction to the Ansys-integrated Harmonic Workflow

02 Harmonic Workflow I: Electromagnetic air gap forces

  • Configuration of a prepared motor model in Ansys Maxwell
  • Definition of objects for automated calculation of air gap forces
  • Selection of the time interval (sampling window)
  • RPM series for the subsequent generation of an ERP waterfall diagram

03 Harmonic Workflow II: Vibration and Structure-borne Sound Performance

  • Structural dynamics in Ansys Mechanical
  • Import of electromagnetic air gap forces calculated in Ansys Maxwell
  • Evaluation of vibrations and ERP spectra

04 Harmonic Workflow III: Airborne Sound Analysis

  • Sound field calculation in Ansys Mechanical
  • Frequency-tuned geometry and meshing of the air space
  • Calculation and evaluation of acoustic quantities in the three-dimensional sound field
  • Acoustic post-processing with Ansys Sound

Day 2

05 Excitation forces in detail

  • Basics of electromagnetic force calculation
  • Time interval, time step size and their correspondence in the excitation spectrum (relation between time and frequency domain)
  • Does my FE mesh fit?
  • Skewed motors, eccentricity

06 Force wave analysis

  • Splitting of air gap force density into spatial and temporal orders by 2D DFT
  • Relation of spatial orders (air gap force waves) to eigenmodes
  • Calculation of spatial orders with the Maxwell Fields Calculator
  • Application of spatial orders as stator excitations in Ansys Mechanical

07 The motor in the drive train

  • Additional causes of noise in the drive train using the example of a geared motor
  • Combination of electromagnetic and mechanical excitations in Ansys Motion
  • Combination of electromagnetically and mechanically caused separately calculated noises in Ansys Sound

08 Outlook on further topics

  • Specifics of induction motors
  • System simulation for noise caused by inverters and highly dynamic drive scenarios
  • Calibration of structural dynamic models for vibration analysis with the Ansys NVH Toolkit

Your Trainers

Dr.-Ing. Jürgen Wibbeler
CAE Engineer, CADFEM Germany GmbH, Berlin

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Straight after you sign up, an automatic confirmation of receipt will be sent to the email addresses you provided. Once you have successfully verified the data you provided, you will receive your personalized sign-up confirmation, containing further information on course fees, the billing address, etc., by email within two to three working days.  

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If the minimum number of attendees is not reached, we reserve the right to cancel the training seven days before it is due to start at the latest. We are happy to inform you on changing your booking to an alternative date. Please note that we accept no liability for hotel or travel bookings that attendees have already made.

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