Descripció del projecte
The project focus on the creation of a powertrain simulation tool capable to select the best configuration of both motor and inverter depending on the HV-Battery.
On the one hand regarding the traction motor, different types will be analyzed such as Permanent Magnet Synchronous Motors, Induction Motors, and Externally excited Synchronous Motor. Besides given a designed motor an optimization approach will be considered to match or even improve some driving specifications.
On the other hand, different inverter topologies will be evaluated, among which depending on the DC bus and the current to be carried, could be Two Level inverter, Neutral Point Clamped inverter and Three level inverter.
Besides, a coupled thermal model of the motor and the inverter will be implemented to predict the temperatures at critical points in such a way the lifespan of the electric drive could be predicted. In this context, the outputs of the thermal model will allow to analyze the possibility of extending the performance of the electrical drive, in terms of increasing the current consumption, the optimization of the refrigeration system and the losses distribution.
Analysis of the interaction between e-Drive and HV-Battery to find the optimal working point for the system.
Considering the current scenario of CUPRA’s electrification, where the sportiness is a must, creating a powertrain simulation know-how in SEAT helps to achieve the targets of our vehicles. For example:
In an early project’s phase, SEAT can influence the final design of the e-Drive.
Stack length
Current
Magnet quantity
When the motor design is frozen, the thermal model will calculate the limits of the component in terms of current increase capability, considering the losses increment and the lifespan. Then, the power increase can be estimated within the limits of the powertrain.
Then, the main objective is creating a tool to obtain and optimize the best configuration of motor and inverter technologies according to vehicle characteristics and given driving cycles, as well as requirements such as acceleration, consumption, among others.
The goals of the project are:
1. Calculate the basic characteristics of a powertrain (Power & Torque curves, Current and Voltage) and the main dimensions (Stack lengths, outer stator diameter, outer rotor diameter) when the vehicle data and the performances are known, and vice versa.
2. Development of an accurate thermal model capable of determining the limits of the components (IGBT’s, DC-Link, Magnets, Windings) depending on load profiles. Also, the calculation of losses and an estimation of the lifespan depending on the working points will be an output.
3. Optimization: Creation a tool capable to choose the best motor and inverter topology considering the vehicle performances and several parameters to be optimized (such as, cost, consumption, package, among others) depending on the HV-Battery characteristics.
