Abstract: Electric motor system including at least a first electric motor that includes a first rotor. The first rotor is mechanically coupled to an engine. At least a second electric motor includes a second rotor. The second rotor is mechanically coupled to a mechanical aggregate. An electronic power system is also included. Each of the first electric motor and the second electrical motor is electrically coupled to one another via the electronic power system in order to exchange electric power at a freely selectable voltage level.

Abstract: A method and circuit arrangement for the sensor-less detection of the angle of rotation of a synchronous machine without a damper is disclosed. According to the disclosed method and circuit arrangement, measuring signals are used which correspond to voltage jumps or pulses generated by a rectifier and the measuring data obtained are provided to a calculating device which calculates the position of the rotor from the dependence of the stator reactance, whereby premagnetization is set when the synchronous machine is started and a measurement is made on each field weakening and strengthening effect. The advantage of the invention resides in both its high precision and the fact that no additional analog current sources are needed to locate the magnet wheel. In addition, the magnet wheel can be located at any load.