Complete Electric Vehicle Powertrain Development with SMT
|With the trend towards more integrated electrified powertrains engineers need tools for the design and analysis of electric machines, transmissions and the coupling between them. MASTA 12 has been developed with this as a core focus. The new electric machines functionality adds to SMT’s existing world leading transmission design and analysis software solutions.
Design of electric machines is a multi domain and multi objective optimisation task. Considerations such as power density, cost, efficiency and NVH need to be carefully balanced. MASTA 12 offers analyses which allow electric machine designers to efficiently consider each of these aspects and the payoffs between them.
NVH is inherently a system level problem where integrated powertrains have a mechanical coupling between motor and transmission and shared housing structures. Dynamics due to both gear and motor excitations needs to be considered. MASTA 12 provides a unique integrated solution in a single package.
Optimisation within each stage of the design and analysis process needs efficient analysis tools and powerful scripting and automation capabilities. In MASTA 12 SMT builds on its existing scripting and automation functionality by extending it to the new electric machines design and analysis capabilities.
Electric Machine Analysis
Analyse an electric machine model for torque, flux linkages, inductances, flux densities, core losses, winding losses, induced voltages, dynamic forces and more.
As with other MASTA analyses multiple Load Cases can be run in parallel for efficient analysis and the user can easily compare and contrast results for multiple loads.
Detailed Electric Vehicle Motor Modelling
|The maximum torque achievable at each speed within the operating speed range is a main target for the electric machine designer.
The maximum torque is limited at lower speeds by the inverter current and at higher speeds by the inverter DC Bus voltage.
For a given machine design MASTA 12 enables quick and easy calculation of the maximum speed torque curve for the full operating range.
|Efficiency is another key design target for electric machines.
Fast generation of efficiency maps is essential for understanding machine performance within the overall operating range and high occupancy load conditions.
MASTA enables rapid calculation of efficiency maps via non Linear DQ models.
|Good NVH performance is another key consideration especially with the reduction or absence of ICE noise.
MASTA 12 offers a uniquely powerful solution for NVH analysis of the full electrified Powertrain.
Calculate both motor torque ripple, dynamic force and gear transmission error excitations and sound power and vibration response of the full system to them within a single package.
Automation and Optimisation
|MASTA’s extensive automation capabilities via the MASTA API and scripting in languages such as C#, python and Matlab are also available for electric machine models and analyses.
Automate model building, setting up and running analyses, parameter design and robustness studies, DOE and many more.
|MASTA’s electric machine functionality has been extensively validated against existing high fidelity electromagnetic analysis software.
Validation results show excellent agreement for all results considered including, flux densities, torques, voltages, dynamic stator forces, core losses and more.
A further extensive validation exercise against physical testing is in progress.
|As outlined in this blog MASTA 12 contains extensive functionality for the design and analysis of electric machines.
Continuing SMT’s tradition of continual improvement and innovation, further developments are already in progress and will be available in future releases.