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DQ0 Analysis with Oscilloscopes

New method for displaying direct quadrature zero (dq0) parameters in motor drive systems.

Direct quadrature zero (dq0) parameters are important variables in field-oriented control algorithms, but typically exist deep within the control systems. During design optimization and debugging it is advantageous to make these parameters available for measurement in real time, and to correlate their values with other measurements such as torque output.

Tektronix has developed a new method for measuring dq0 components and the resultant drive vector for rotary sensor-based and sensorless systems. This technique is supported as an option in the Inverters, Motors and Drivers Analysis package (Option IMDA-DQ0) on 5 or 6 Series MSO oscilloscopes. It uses signal processing to compute d, q and 0 control parameters based on real-time measurements of drive system outputs. This enables motor designers to visualize the optimal torque generated for a given electrical input.

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