Abstract: The method serves for monitoring an energy conversion device such as for example a pump assembly, a compressor or likewise. The energy conversion device consists of several function units which are functionally linked to one another. Power-dependent variables of at least one function unit are automatically detected in temporal intervals and/or computed and compared to one another or values derived therefrom and/or to predefined values. A corresponding signal is produced in dependence of this comparison, via which signal, the efficiency reduction of a function unit or the complete device may be specified.

Abstract: The electric motor is equipped with an electronic control, for example in the form of a frequency converter (2) and comprises at least one Seebeck element (6) whose one side is connected to the motor (1) in a heat-conducting manner and whose other side is in heat-conducting connection with a cooling medium. The electrical output power of the Seebeck element (6) is led to the electronic control (2) of the motor (1).

Abstract: The method serves for detecting the magnetic flux, the rotor position and/or the rotational speed of the rotor in a single- or multiphase permanent magnet- or -synchronous motor or -generator using the stator voltage equations L·{dot over (i)}?=?R·i?+p·?·?m?+u???Equation (1) L·{dot over (i)}?=?R·i??p·?·?m?+u???Equation (2) It is characterized in that with the evaluations one takes into account the energy conditions of the rotor, by which means one may achieve an accuracy which is considerably greater than known methods.

Abstract: The electric motor is equipped with an electronic control, for example in the form of a frequency converter (2) and comprises at least one Seebeck element (6) whose one side is connected to the motor (1) in a heat-conducting manner and whose other side is in heat-conducting connection with a cooling medium. The electrical output power of the Seebeck element (6) is led to the electronic control (2) of the motor (1).

Abstract: The method serves for detecting the magnetic flux, the rotor position and/or the rotational speed of the rotor in a single- or multiphase permanent magnet- or -synchronous motor or -generator using the stator voltage equations

Abstract: The method for controlling a voltage/frequency converter controlled single-phase or polyphase electric motor evaluates the phase shifting between the EMF and BEMF by way of the deviation between the zero crossing of the phase current and the voltage produced by the intrinsic induction and readjusts the frequency of the converter accordingly. The measurement of the intrinsic induction is effected in the zero crossing of the current courses of the associated phase, wherein during the measurement the phase is separated from the supply network.