The rise of electric drive systems in modern vehicles and industries has brought new challenges in minimizing noise, vibration, and harshness (NVH) while maintaining high electromagnetic performance. Electric machines induce new electromagnetic excitations of the drivetrain, resulting in additional vibration and noise called e-NVH (electromagnetic noise, vibration, and harshness) for their specific frequency signature and mitigation techniques. This presentation explores the critical tradeoffs between electromagnetic and e-NVH performances in electric machines design, illustrating the role of SIMULIA Manatee in optimizing this balance. First, it highlights the most magnetic noise control techniques (such as skewing, notching, pole shaping or harmonic current injection) and their relationship with electromagnetic design parameters such as efficiency or torque. Then, it demonstrates the use of Manatee software to quickly study these trade-offs and identify the best designs in concept and preliminary design phases of electric drivetrains.  

This session will highlight:

• e-NVH mitigation techniques: most efficient techniques are notching, skewing, pole shaping and Harmonic Current Injection
• e-NVH virtual prototyping workflow: e-NVH simulation requires collaboration between electromagnetic, control, mechanical & NVH engineers
• electromagnetic & vibro-acoustic performances: most magnetic noise control techniques give slight torque reduction which can be easily compensated
• Manatee Software: Manatee algorithms accelerate e-NVH calculations, enabling faster design iterations and more efficient collaboration between e-machine designers and integrators