Abstract

For the variable frequency fed induction motor the possible operating points are limited not only by the feed and motor characteristics but also by the presence of an instability region. The pattern of this instability region and the particular dependence of the extent of the frequency interval bounding it, on the torsional elasticity of the shafting, allow to reduce the extent of the instability region by appropriately dimensioning the shafting. A numerical example shows how the dominant roots locus of the characteristic equation of the linearized system, enables the numerical value of the torsional elasticity to be used in the dimensioning of the shafting, to be determined.

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