The invention relates to an open-loop and/or closed-loop control device for operating an asynchronous machine (K), which is fed by a 3-phase power converter (G). An open-loop and/or closed-loop control structure (the structure for short) (1, 2, 3, 4, 5, C, F) has a stator flux controller (R) and a pulse pattern generator (P) for generating pulse signals based on mean values, wherein an output of the stator flux controller (R) is connected to an input of the pulse pattern generator (P), with the result that the pulse pattern generator (P) can generate the pulse signals as a function of a manipulated variable which is generated by the stator flux controller (R), wherein the stator flux controller (R) is configured so as to generate the manipulated variable as a function of a desired value of the stator flux of the asynchronous machine (K) and as a function of a desired value of the torque of the asynchronous machine (K), and wherein the stator flux controller (R) has a dead-beat control response.