Multiphysics Simulation of Electric Motor NVH Performance with Eccentricity

Zhang, Henry; Jaura, Ankur; Kumar, Dinesh; Sambharam, Tushar; Zhang, Zheming; He, Song; Zhang, Peng; Gsj, Gautam

doi:10.4271/2021-01-1077

Cited by 10 publications

(1 citation statement)

References 16 publications

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“…Various electromagnetic simulation approaches study the structural dynamic impact on the motor NVH performance [14][15][16][17][18][19][20]. These calculations are significantly computation intensive and refer only to the rotor and stator geometry.…”

Section: Drive Unitmentioning

confidence: 99%

A Novel Approach to Predict the Structural Dynamics of E-Bike Drive Units by Innovative Integration of Elastic Multi-Body-Dynamics

Steinbach,

Lechler,

Kraemer

et al. 2023

Vehicles

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This paper presents a novel approach to address noise, vibration, and harshness (NVH) issues in electrically assisted bicycles (e-bikes) caused by the drive unit. By investigating and optimising the structural dynamics during early product development, NVH can decisively be improved and valuable resources can be saved, emphasising its significance for enhancing riding performance. The paper offers a comprehensive analysis of the e-bike drive unit’s mechanical interactions among relevant components, culminating—to the best of our knowledge—in the development of the first high-fidelity model of an entire e-bike drive unit. The proposed model uses the principles of elastic multi body dynamics (eMBD) to elucidate the structural dynamics in dynamic-transient calculations. Comparing power spectra between measured and simulated motion variables validates the chosen model assumptions. The measurements of physical samples utilise accelerometers, contactless laser Doppler vibrometry (LDV) and various test arrangements, which are replicated in simulations and provide accessibility to measure vibrations onto rotating shafts and stationary structures. In summary, this integrated system-level approach can serve as a viable starting point for comprehending and managing the NVH behaviour of e-bikes.

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Section: Drive Unitmentioning

confidence: 99%

A Novel Approach to Predict the Structural Dynamics of E-Bike Drive Units by Innovative Integration of Elastic Multi-Body-Dynamics

Steinbach,

Lechler,

Kraemer

et al. 2023

Vehicles

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Analytical and Experimental Studies of Electric Motor NVH Design Focusing on Torque Ripple and Radial Force

He¹,

Momen²,

Patruni³

et al. 2022

SAE Technical Paper Series

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Modeling Electric Motors with High Fidelity for Accurate eDrive NVH Simulation

Nie¹,

Chandrasekhar²,

Wu³

2023

SAE Technical Paper Series

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<div class="section abstract"><div class="htmlview paragraph">A sophisticated finite element analysis (FEA) method for modeling interior permanent magnet (IPM) electric motors is presented. Based on this method, a coupled structural-acoustic analysis procedure was developed to simulate the motor dyno vibroacoustic responses with improved accuracy and reliability for NVH (noise, vibration, and harshness) behavior prediction over a wide range of torques and frequencies under the operational electromagnetic forces. The proposed motor modeling and analysis method is detail-oriented with high fidelity in modeling the structure and complex material representation. To effectively deal with the motor stator core constructed with large numbers of electromagnetic laminae, the unit-cell approach was employed to derive the core material properties by homogenizing the laminated core as an equivalent orthotropic material. Meanwhile, the windings were modeled by capturing the precise geometry for accuracy improvement. Additionally, the method facilitates modeling the varnish fill details between the core, linings, and the windings, such as bonded locations, area coverage, and fill rate. Guidelines pertinent to FEA modeling of motor components related to element type selection, mesh size determination, acoustic domain definition, and structure-acoustic interface connection are also provided. The stator analysis model was first correlated with the free-free modes and frequency response functions (FRF) obtained from the vibrometer test before being incorporated into the motor dyno system to simulate the radiated noise for critical motor whine orders and other NVH-related behavior. Finally, the simulated results were verified against motor dyno test data over a wide range of torque and frequency. This high-fidelity motor model can further be used for advanced studies in objectively assessing the influence of airgap eccentricity, rotor skew configuration, stator attachment architecture, etc., on motor NVH behavior.</div></div>

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Multiphysics Simulation of Electric Motor NVH Performance with Eccentricity

Cited by 10 publications

References 16 publications

A Novel Approach to Predict the Structural Dynamics of E-Bike Drive Units by Innovative Integration of Elastic Multi-Body-Dynamics

A Novel Approach to Predict the Structural Dynamics of E-Bike Drive Units by Innovative Integration of Elastic Multi-Body-Dynamics

Analytical and Experimental Studies of Electric Motor NVH Design Focusing on Torque Ripple and Radial Force

Modeling Electric Motors with High Fidelity for Accurate eDrive NVH Simulation

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