Holistic approach

…gives better results than seperate component optimization.

For that reason our research team derived a set of analytical equations, ranging from vehicle specification and driving cycle analysis, to motor parameter optimization and thermal circuit consideration. All of that has been packaged into our own optimization tool, for a fast and reliable analysis.

Vehicle Physics

Typical urban car driving cycle analysis

The first part of our optimization is basic vehicle physics analysis.

Input data includes

• vehicle mass and shape,
• wheel size,
• performance requirements,
• other specifics.

If available, we analyze the presumed driving cycle of the vehicle in question to extract most common operation conditions for further use in efficiency optimization. The results of this part are torque and speed requirements, which we either use directly, or modify manually, according to your wishes.

Motor parameter optimization

Working point efficiency optimization

The main part of the design is motor parameter optimization. Here, we define the power source voltage and choose the best topology parameter combination for the input. Criteria for the choice of the final motor is fine tuning around 50 motor properties, depending on what suits the application better.

The most commonly considered properties are

• weight and size,
• maximum torque and speed,
• average efficiency and efficiency in specific working points.

Also some other properties like current demand, winding resistance and inductivity are often examined. Our experts further explore the chosen motor, yielding torque-speed characteristics and in the end automatically producing preliminary blueprints.

Example of an efficiency map for a specific parameter optimization, with torque-speed characteristics

Example of numerical verification

On the basis of the produced blueprints we calculate the thermal circuit and choose a sufficient cooling technique from the results. Parts of motor construction, like insulation and impregnation are included in the analysis.

To top it off, we do numerical calculations to verify the analytical model. The final result of the design optimization tool is not only motor dimensions, but also it’s operational properties, that can be used in the development of the controller and other auxiliary systems. With this, propulsion prototype production is accelerated and the entire development cycle shortened.

Prototyping »