FEV Oil-Cooled eMotor for Electric Drive Unit: A Case Study


In the ever-evolving field of electric vehicle technology, optimizing the efficiency and performance of electric drive units is paramount. One of the leading innovations in this area is the development of oil-cooled electric motors (eMotors). This case study focuses on the collaboration between FEV and Particleworks, showcasing how advanced simulation methodologies can significantly enhance the performance and reliability of electric drive units.

Particleworks Simulation Methodology

Particleworks leverages a cutting-edge, mesh-free simulation technique known as the “Moving Particle Simulation” (MPS) methodology. Unlike traditional simulation methods that rely on complex meshing processes, MPS uses particles to represent fluid and thermal phenomena. This approach allows for more flexible and accurate modeling of complex fluid dynamics, making it particularly suited for applications such as oil flow distribution and heat transfer in electric motors.

Benefits of Particleworks in eMotor Development

  1. Rapid Prediction of Oil Flow Distribution:
    • Particleworks enables engineers to quickly and accurately predict how oil will flow through the electric motor. This is crucial for ensuring that all components receive adequate lubrication, which is essential for reducing wear and prolonging the motor’s lifespan.
  2. Efficient Heat Transfer Analysis:
    • The ability to simulate heat transfer processes allows for the optimization of cooling strategies. By understanding how heat is dissipated within the motor, engineers can design systems that maintain optimal operating temperatures, thereby enhancing performance and preventing overheating.
  3. Power Loss Minimization:
    • Particleworks also helps in identifying and minimizing power losses. By analyzing the interaction between the oil and moving parts, engineers can develop designs that reduce friction and improve overall efficiency.

FEV’s Application of Centrifugal Oil Cooling

In this case study, FEV utilized centrifugal oil cooling to significantly enhance the performance of their electric drive unit. This innovative cooling method provides several key benefits:

  • Faster Recovery Post Peak Torque Operation:
    • Centrifugal oil cooling ensures that the motor can quickly return to optimal operating temperatures after running in the peak torque region. This rapid recovery is crucial for maintaining performance and reliability during high-demand periods.
  • Increased Power Output and Torque:
    • By effectively managing heat and lubrication, FEV was able to achieve a remarkable 50% increase in both power output and torque. This substantial improvement underscores the effectiveness of oil cooling in enhancing the capabilities of electric drive units.


The collaboration between FEV and Particleworks exemplifies the potential of advanced simulation methodologies in driving innovation in electric vehicle technology. By leveraging the MPS methodology, engineers can gain deeper insights into fluid dynamics and thermal processes, leading to more efficient and powerful electric motors.

This case study highlights the significant advancements that can be achieved through the application of state-of-the-art simulation tools and innovative cooling techniques. For a more detailed understanding of the methodologies employed and the results obtained, you can read the full case study here: FEV Oil-Cooled eMotor Case Study.

By exploring this case study, engineers and researchers can gain valuable insights into the design and optimization of oil-cooled electric motors, paving the way for further advancements in electric drive technology.