Patent ID: 8680793
Filing Date: 2014-03-25
Classification: F01D,H02P

Abstract:
1. A machine, comprising: a rotor, a converter-controlled drive with a variable rotational frequency, a working machine, wherein the drive and the working machine are connected to one another such that a torque is transmitted, a frequency converter which is electrically connected to the drive and converts input frequencies to output frequencies, wherein the frequency converter is embodied such that in a Campbell diagram, relating to the machine, intersection points result from wherein the output frequencies are grouped into a plurality of concentration ranges based upon a rotational speed of the machine, wherein each concentration range comprises output frequencies which are close to one another and which respectively have a common output point on the abscissa of the Campbell diagram, wherein upper and lower limits of each concentration range is defined by an intersection point of wherein each concentration range defines a blocking range, and wherein the machine has an operating rotational speed range which lies outside the blocking ranges.