Hand-Shake Filters for Signal Smoothing in a Switching Induction Machine Drive

This paper presents two accurate methods to smooth the d-q components of a poly-phased signal without introducing magnitude and phase errors. The resulting hand-shake filters (HSF) can be used to estimate the fundamental of a signal, an important function for the control of motor drives since the induction machines (IM) are modeled using the equivalent first harmonic theory. Henceforth it is now possible to approach IM model theory, even if high switching frequencies are used. HSF can also ease real-time estimation of IM flux, torque and parameters. Simulation and experimental results demonstrate the accuracy of the methods