SaberRD Design Example: Electric Vehicle Powertrain Simulation with Single and Two Gear Transmission
Balaji Siva Prasad Emandi
Posts: 28
Introduction:
This document presents the details of the simulation of a single gear and a two-gear transmission system for an Electric Vehicle (EV). It is quite common that the transmission system has a single-gear ratio between the drive train and the wheel axle in an EV. Recent studies say that the two-gear system can enhance the range by around 5%. The goal of simulation in this design example is to draw the advantages of two-gear transmission over the single-gear transmission.
Central to this powertrain design, a high fidelity PMSM motor model produced with the JMAG FEA solver includes spatial harmonics, flux saturation, and frequency-dependent iron losses. The motor is fed current by a 3-phase Voltage Source Inverter (VSI) controlled by a FOC algorithm implementing Maximum Torque per Amp (MTPA) and Flux Weakening strategies and using the interceptive sinusoidal PWM method. The dc link voltage (365V) is realized by a Li-ion battery characterized using the Battery tool in SaberRD. The motor shaft is connected to the drive shaft through a transmission block. The transmission block helps to configure multiple gears. So, the model is used to evaluate the performance of the powertrain with a single gear and two gear transmission. The driveshaft is connected to a simplified car dynamics model accounting for the force of gravity on sloped terrain, as well as for the rolling and aerodynamic forces.
Circuit Snapshot:
Figure below is a snapshot of the top level schematic of the EV Powertrain design.
How To Run the Example:
Download the attached "powertrain1.zip" and unzip the contents. Open the powertrain1.ai_dsn in SaberRD and run the experiment, optimization_tests experiment listed in the Experiment Analyzer.
For more details of the design, how to run the design, etc., refer to the README.pdf file in the attachments.
Note:
This design example can be simulated only in SaberRD commercial edition 2020.03 and above.
This document presents the details of the simulation of a single gear and a two-gear transmission system for an Electric Vehicle (EV). It is quite common that the transmission system has a single-gear ratio between the drive train and the wheel axle in an EV. Recent studies say that the two-gear system can enhance the range by around 5%. The goal of simulation in this design example is to draw the advantages of two-gear transmission over the single-gear transmission.
Central to this powertrain design, a high fidelity PMSM motor model produced with the JMAG FEA solver includes spatial harmonics, flux saturation, and frequency-dependent iron losses. The motor is fed current by a 3-phase Voltage Source Inverter (VSI) controlled by a FOC algorithm implementing Maximum Torque per Amp (MTPA) and Flux Weakening strategies and using the interceptive sinusoidal PWM method. The dc link voltage (365V) is realized by a Li-ion battery characterized using the Battery tool in SaberRD. The motor shaft is connected to the drive shaft through a transmission block. The transmission block helps to configure multiple gears. So, the model is used to evaluate the performance of the powertrain with a single gear and two gear transmission. The driveshaft is connected to a simplified car dynamics model accounting for the force of gravity on sloped terrain, as well as for the rolling and aerodynamic forces.
Circuit Snapshot:
Figure below is a snapshot of the top level schematic of the EV Powertrain design.
How To Run the Example:
Download the attached "powertrain1.zip" and unzip the contents. Open the powertrain1.ai_dsn in SaberRD and run the experiment, optimization_tests experiment listed in the Experiment Analyzer.
For more details of the design, how to run the design, etc., refer to the README.pdf file in the attachments.
Note:
This design example can be simulated only in SaberRD commercial edition 2020.03 and above.
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