IMproving Secondary Flux Analysis Model of Induction Motor

摘要

The discretization eror becomes a problem when we use digital control to realize a flux observer, etc., with an induction motor model. The induction motor model has integrators on both the primary and secondary circuit models. if discretization error occurs in the secondary circuit model, axial deviation can occur in the estimated flux leading to instability at high speed range. There are methods to use precise discretization model to prevent this, but these need to caculate complx parameters. Therefore, these mut take long calculation times when compensating the parametric fluctuation. In this aper, we propose a method to reduce the integral error by approximating the integrator of the secondary circuit odel using rotational coordinate conversion.