Method for influencing an asynchronous machine, the asynchronous machine being influenced by a control device, having the steps a. Presetting or impressing a voltage vector (U S) for the machine rotating at a rotating field frequency (f Modulator), both the rotating field frequency and the voltage vector having been determined by a control or closed-loop control based on a voltage-frequency characteristic in order to track the voltage vector (U S) during operation by means of a power factor control as cos φ control with a power factor controller, characterized by ba. Calculation of desired values of the power factor on the basis of at least electrical data of the asynchronous machine; bb. Determination of actual values of the power factor (cos φ ist) with the participation of physical data comprising the predetermined or impressed voltage vector (U S) and a current vector (I S); bc. Determination of differences between the actual values and target values of the power factor (cos φ soll, cos φ ist) and control of the power factor with these differences as input variables; bd. Calculating output variables of the power factor controller as manipulating (regulating) variables (U Add) for the control unit; be. Limiting the output values (U Add) and adapting the voltage vector (U S) via the regulating variables (U Add); b. in a loss-optimized operation of the asynchronous machine; c. wherein a controller amplification of the controller for the power factor is adapted in dependence on the setpoint or actual speed or in dependence on the rotating field frequency, or the control difference of the controller for the power factor is limited to a maximum value in positive and/or negative direction; d. wherein the control of the power factor is used for the adaptation of the motor voltage, which determines the setpoint value of the control, which is dependent on the speed or rotational field frequency, in a copper loss-optimal manner and deterministically only from the electrical data of the asynchronous machine; e. whereby a positive limitation of the regulating variables (U Add) at the controller output is adapted in dependence on the current output frequency. a. Presetting or impressing a voltage vector (U S) for the machine rotating at a rotating field frequency (f Modulator), both the rotating field frequency and the voltage vector having been determined by a control or closed-loop control based on a voltage-frequency characteristic in order to track the voltage vector (U S) during operation by means of a power factor control as cos φ control with a power factor controller, characterized by ba. Calculation of desired values of the power factor on the basis of at least electrical data of the asynchronous machine; bb. Determination of actual values of the power factor (cos φ ist) with the participation of physical data comprising the predetermined or impressed voltage vector (U S) and a current vector (I S); bc. Determination of differences between the actual values and target values of the power factor (cos φ soll, cos φ ist) and control of the power factor with these differences as input variables; bd. Calculating output variables of the power factor controller as manipulating (regulating) variables (U Add) for the control unit; be. Limiting the output values (U Add) and adapting the voltage vector (U S) via the regulating variables (U Add); ba. Calculation of desired values of the power factor on the basis of at least electrical data of the asynchronous machine; bb. Determination of actual values of the power factor (cos φ ist) with the participation of physical data comprising the predetermined or impressed voltage vector (U S) and a current vector (I S); bc. Determination of differences between the actual values and target values of the power factor (cos φ soll, cos φ ist) and control of the power factor with these differences as input variables; bd. Calculating output variables of the power factor controller as manipulating (regulating) variables (U Add) for the control unit; be. Limiting the output values (U Add) and adapting the voltage vector (U S) via the regulating variables (U Add); b. in a loss-optimized operation of the asynchronous machine; c. wherein a controller amplification of the controller for the power factor is adapted in dependence on the setpoint or actual speed or in dependence on the rotating field frequency, or the control difference of the controller for the power factor is limited to a maximum value in positive and/or negative direction; d. wherein the control of the power factor is used for the adaptation of the motor voltage, which determines the setpoint value of the control, which is dependent on the speed or rotational field frequency, in a copper loss-optimal manner and deterministically only from the electrical data of the asynchronous machine; e. whereby a positive limitation of the regulating variables (U Add) at the controller output is adapted in dependence on the current output frequency.