Introduction to the trend function of the IMDA suite of automotive three-phase inverter motor drive analysis tools

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Today we bring you a three-phase inverter motor drive analysis solution involved in bench testing

A common requirement during automotive motor drive development testing is the ability to view motor response over a longer test period, by recording and extending the number of acquisitions to monitor DUT behavior under different load conditions. This dynamic measurement helps understand the optimal design and the correlation between different parameters such as voltage, current, power, frequency, and their changes based on load conditions.

Power analyzers used for static or steady-state testing usually cannot meet the above test requirements. In order to solve this test pain point, Tektronix has specially developed a three-phase inverter motor drive analysis (IMDA) software suite. With the Tektronix IMDA solution, engineers can take full advantage of the advanced user interface, six or eight analog input channels and "high resolution" mode (16 bits) on the 5/6 series mixed signal oscilloscope to design more efficient three-phase motor drive systems.

The trending feature integrated into the IMDA suite provides two unique power quality measurement trend graphs:

• Time trend graph

• Collect trend graphs

The time trend graph shows the measured values ​​for each cycle or acquisition waveform (record); while the acquisition trend graph shows the average of the measured values ​​for each record in each acquisition. By setting the acquisition count, you can capture long data records to perform in-depth analysis and understand the dynamic behavior of the motor response.

Example 1: Display a trend graph of the power quality parameter of interest over time in the current screen

Example 2: Acquisition Trend Plot Showing Average Power Measurements from 100 Acquisitions

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The time trend chart can clearly show the changing trend of the corresponding parameters in the full-screen data currently collected, quickly find the specific waveform corresponding to the working condition of interest, and can help engineers quickly locate problems or confirm the safety of design solutions in many cases. The acquisition trend chart continuously records the changes in the oscilloscope waveform refresh many times. A typical application case is to measure the changes in motor efficiency under different working conditions during the R&D design stage. Engineers can set the motor speed to gradually increase from low speed to high speed and cycle multiple times, and continuously measure the changing trend of motor efficiency in this process. As shown in the green acquisition trend chart in the figure below, it clearly shows that at a certain speed, the motor efficiency will have an abnormal drop, so the next step is to further optimize this working condition.