Analysis and calculation of the electric drive for the extruder in a controllable electrical complex for production of synthetic yarns

Abstract

The conditions that function We(z), which ensures the minimum acceptable time of the switching process, must satisfy can be formulated as follows: — function We(z) should have nulls equal to the poles of Wn(z) positioned in the unit circle or outside of plane z; — function W(z) or 1 — We(z) should have all nulls of Wn(z) located in the unit circle or outside of plane z as nulls; — function W(z) or 1 — We(z) should contain z−1 as cofactor z−1. If Wn(z) is an unstable unit impulse response, then F(z) should contain all poles of Wn(z) lying in the unit circle or outside of plane z as nulls (with the exception of the poles for z = 1). If Wn(z) has nulls located in or outside of the unit circle, these nulls must be nulls of W(z) = 1 − (1 − z−1). In these two cases, the briefest time of the switching process will exceed the value which can be obtained for a system with a stable unit impulse response Wn(z) which has no nulls in or outside of the unit circle of plane z.