Dynamic Motor Power Measurement Enables In-Vehicle Testing Of EVs

Focus:

Mobile power measurement in electric vehicles (EVs) was previously difficult due to the dynamic nature of the vehicle speed. However, unique features provided in HBM’s eDrive, a system for testing electric machines and drives, make mobile electrical power measurements possible in real-world operating environments. After discussion of why in-vehicle testing is needed, power measurement challenges, and the limitations of traditional power analyzers, this article will explain how eDrive performs dynamic power measurements and publishes cycle-based calculations to a CAN bus for correlation to an existing DAQ system, and the implications for testing EVs under real world conditions. A series of dynamic power measurement examples are presented wherein eDrive is used to test the motor system in an electric scooter. These measurements demonstrate how motor and drive performance can be assessed during vehicle acceleration and deceleration, coasting and other conditions as well as to test motor control techniques.

What you’ll learn:

• How to make dynamic power measurements in EVs using HBM’s eDrive test system
• How to correlate dynamic power measurements with real world operating conditions in EVs

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Author & Publication:

Mitch Marks and Mike Hoyer, HBM Test and Measurement, Madison, Wisc., How2Power Today, Oct 15 2019

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