Abstract: A method for detecting the state of operation of a rotating machine, in particular a centrifugal pump, includes detecting using at least one first temperature sensor a change in temperature in or at least one bearing region of a rotating element of the rotating machine, identifying temperature gradients using an evaluation unit, from a temperature profile generated from the at least one temperature sensor, and identifying a switch-on and/or switch-off process of the rotational movement of the machine on the basis of a characteristic of the ascertained temperature gradient.

Abstract: An electrical motor arrangement includes and electric motor having a frequency converter. The components of the electronics of the frequency converter are distributed among a plurality of modules, the modules are electrically connected to each other, and the individual modules are arranged radially on the motor and each have an individual closed housing in the mounted state. A cooling arrangement may be provided in which a fan causes a heat-dissipating air stream to pass over the modules and cooling fins arranged between adjacent modules to dissipate heat from the electric motor stator.

Abstract: A method for structural analysis and correction of a system of differential equations described by a computer language is disclosed. A description of a physical system (in the form of equations, in particular differential equations) as a computer program in a computer system is included. Suitable bipartite graphs for examining the solubility of the equations are generated with the method. Erroneous descriptions can be determined and can possibly be corrected with the bipartite graphs. A computer system containing a computer-readable medium having computer-executable instructions for performing the method, and a corresponding data carrier are disclosed.

Abstract: A method for structural analysis and correction of a system of differential equations described by a computer language is disclosed. A description of a physical system (in the form of equations, in particular differential equations) as a computer program in a computer system is included. Suitable bipartite graphs for examining the solubility of the equations are generated with the method. Erroneous descriptions can be determined and can possibly be corrected with the bipartite graphs. A computer system containing a computer-readable medium having computer-executable instructions for performing the method, and a corresponding data carrier are disclosed.