Electrical and signal processing aspects

Calculating an efficiency map involves sweeping the machine through all possible torque and speed settings with respect to the multiple inverter operating modes. The traditional approach involves low-frequency analogue measurement devices - such as multimeters and AC Power Analyzers - along with digital torque sensors. With modern high-speed digital data acquisition systems such as eDrive, it is now possible to perform efficiency analysis directly on the digitized data. This accelerates the test considerably and allows more complex analysis of the transient dynamic power measurements that are associated with real-world driving and the Worldwide Harmonized Light Vehicle Test Procedure (WLTC). Detailed efficiency maps based on this high-speed digital data are produced using nCode GlyphWorks, which can calculate power and energy consumption for all electric motor states. The Surface Plot glyph is ideal for torque vs speed efficiency and loss mapping for AC motor tests as well as other applications for general XYZ mapped data.

nCode GlyphWorks offers advanced digital signal post-processing tools to analyse the dynamic power over all component systems and operating states. Electrical and mechanical data are combined, and power and efficiencies are calculated. Calculating power in the post-data acquisition phase allows more complex analysis scenarios to take place. For example, more in-depth characterization of the performance of the inverter and the electric motor. Sensitivity analysis or what-if scenarios can be evaluated to optimize the electric motor controller. Frequency analysis is used to assess the dynamic responses. The effect of torque-ripple on vibration-induced damage can be determined. Discrete operating states can be combined to understand how vehicle efficiency is influenced by different real-world operating profiles.