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ANSYS Electric Motor NVH Multiphysics Solution

ANSYS Electric Motor NVH Multiphysics Solution

The noise from the electric drive system is the largest internal sound source of new energy vehicles. ANSYS Electric Motor NVH Multiphysics Solution is presented in this post.

NSYS Electric Motor NVH Multiphysics Solution

Table of contents

1. NVH issues in new energy vehicles

2. Motor NVH Design

3. Ansys Workbench provides integrated solutions for motor NVH design

4. Electromagnetic force analysis (Maxwell)

5. Structural Vibration Analysis (Mechanical)

(1) Modal analysis

(2) Harmonic response analysis

6. Parameter calibration (optiSLang)

7. Acoustic Analysis (Mechanical)

8. Multidisciplinary Optimization of Motor NVH (optiSLang)

9. Rotor Eccentricity Solution (ACT)

The following content is taken from this article

Motor NVH Design

(1) Technical challenges

▪ Diversity of motor noise generation mechanisms

▪ Complexity of noise propagation paths

   Body sound radiation

   System structure transmission

▪ Design contradiction between miniaturization, high torque and low noise

▪ Higher requirements for simulation accuracy

▪ Unevenness in manufacturing quality

(2) ANSYS key technologies

▪ Integrated solution – true multi-physics coupled simulation and cross-disciplinary optimization platform

   Electromagnetic-Vibro-Acoustic-Optimization

   Seamless data connection between multidisciplinary models

   High-speed optimization based on reduced-order models

▪ Industry-leading solving tools – accurate and robust electromagnetic, structural, and acoustic solvers

▪ Industry-leading optimization tools—connect all solvers for automated operation

▪ Sound experience and design tools – virtual sound prototype, simulation to achieve motor noise design

▪ Parameter calibration – more accurate simulation modeling

Electromagnetic force analysis

Three ways to calculate harmonic electromagnetic force:

Calculation method

Electromagnetic force type

Scope

Mapping form

Object Based

Maxwell Force

Surface forces

Concentration

Element  Based 

(Surface)

Maxwell Force

Surface forces

Unit force

Element Based 

(Volumetric)

Lorentz force, magnetostrictive force

Volume force

Unit force

▪ When there are many stator slots and no skewed slots or skewed poles, use the Maxwell 2D Object-Based method

▪ When the motor structure is complex, it is recommended to use the Maxwell 3D Element-Based method to calculate the electromagnetic force, which can more realistically reflect the axial spatial distribution characteristics of the electromagnetic force

   Stator skewed slots, rotor continuous skewed poles, V skewed poles, zigzag skewed poles

   Axial Flux Motor

▪ When the number of stator teeth is small, it is recommended to use the Maxwell 2D Element-Based method to calculate the electromagnetic force, which can more realistically reflect the spatial distribution characteristics of the electromagnetic force in the circumferential direction.

   Fractional slot concentrated winding motor

   Switched Reluctance Motor

   DC Motor

▪ When the stator tooth top has special modification design such as auxiliary slots, the Element-Based method should be used

The model in this case has the same axial shape and a simple tooth tip structure, so both analysis methods are applicable, with a maximum ERP Level difference of 1 dB.

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