Real time dq0 analysis of FOC systems

Currently designers measure Direct-quadrature-zero (dq0) with custom built embedded control software, additional hardware such as inductor and capacitor filter banks and programming using FPGA and microprocessor. This is a very complex task and needs domain expertise. It requires access to probing points on the controller board which is challenging [3]. This paper talks about how motor designers can measure dq0 components which are the outputs in the control system block from three phase electrical signals using real time oscilloscope. Designers measure magnitudes, phasor plot of rotor axis, and ripple on dq0 components. This Oscilloscope based solution computes dq0 using cross coordinate transformation matrix of real time AC signals, with or without rotor angle feedback, to get d and q DC signals during in-circuit operation. These transformed signals are used to refine the controller algorithms.