Method and system for controlling an electric machine

A method for controlling an electric machine using measurement coils arranged in an air gap situated between a stator and a rotor of the electric machine, a plurality of phase windings assigned to different electric phases being present, the method comprising:

• measuring magnetic linkage fluxes in the air gap via the measurement coils;
• determining magnetic linkage fluxes of the plurality of phase windings of the different phases;
• transforming the determined magnetic linkage fluxes of the plurality of phase windings into a stator-fixed orthogonal coordinate system in order to obtain orthogonal magnetic linkage fluxes;
• measuring phase currents flowing through the plurality of phase windings;
• transforming the measured phase currents into the stator fixed orthogonal coordinate system in order to obtain orthogonal phase currents;
• ascertaining, from the orthogonal magnetic linkage fluxes and the orthogonal phase currents, an instantaneous torque, and/or ascertaining, from the orthogonal magnetic linkage fluxes and the orthogonal phase currents, a flux-forming component of a phase current vector formed from the orthogonal phase currents;
• and
• controlling the electric machine based on the instantaneous torque and/or the flux-forming component thus determined,
• wherein each of the measurement coils is arranged on a tooth face of a stator tooth of the stator, the tooth face facing the air gap, and
• wherein the measurement coils are planar coils applied to foil.