Software based condition monitoring for machines

A computer-implemented method for determining conditions of electric motors, the method comprising:

• receiving a technical specification of an electric motor comprising at least maximal torque and/or maximal rotational speed of an electric motor;
• continuously receiving from a frequency converter of the electric motor, a data set including at least electrical current currently supplied to the electric motor by the frequency converter;
• continuously deriving a current load of the electric motor based on the technical specification and the data set via a knowledge base, wherein the knowledge base comprises relationships between the technical specification together with the data set and the current load of the electric motor, wherein deriving the current load comprises deriving a current electrical torque of the electrical motor by the frequency converter, and based on the derived current electrical torque, deriving the current load of the electric motor via the knowledge base;
• continuously determining a current condition of the electric motor by integrating over the derived current load and all previously derived current loads;
• and
• deriving and updating a time point for servicing of the electric motor based on the current condition of the electric motor.