Patent ID: 9379646
Filing Date: 2016-06-28
CPC Classification: H02P

Claim Text:
1. A method for operating a synchronous machine via a three-phase power controller including three semiconductor controllers connected to a three-phase power supply, the method comprising: providing a microcontroller having a processor, wherein the processor determines a phase difference between magnet-wheel voltage of the synchronous machine and voltage of the three-phase power supply; determines a rotational speed of the rotor of the synchronous machine based on a position angle of the rotor; determines a phase position of the three-phase power supply; determines at least some of stator currents of the synchronous machine; calculates a torque curve for the synchronous machine for a definable period of time in the event of activation of each of the semiconductor controllers having thyristors connected in anti-parallel while taking into account the determined values for phase difference between at least two phases controlled by the semiconductor controllers, the rotational speed, the stator current and the phase position of the three-phase power supply, and calculates another torque curve for the synchronous machine for a definable period of time in the event of activation of less than all of the semiconductor controllers while taking into account the determined values for phase difference between at least two phases controlled by the at least two semiconductor controllers, the rotational speed, the stator current and the phase position of the three-phase power supply; determines a switching time point based upon the calculation, wherein the at least two semiconductor controllers are activated at the switching time point; and triggers the at least two semiconductor controllers based on the determined switching time point.