Actuating device for a moveable vehicle part, having an electric servomotor, having an actuating mechanism coupled with the servomotor on the output side and having a control unit for controlling the servomotor having a motor current (I M), wherein the control unit is set up to regulate the motor rotational speed (n) of the servomotor by regulating the motor voltage (U M) to a desired rotational speed value (n s), characterised in that • the control unit is additionally set up to limit the motor torque of the servomotor by limiting the motor current (I M) to a torque threshold value (D G), • the control unit has a PWM switching module as well as a control circuit for controlling the PWM switching module, wherein the control circuit comprises a frequency regulating branch having a proportional-integral regulator and a torque limiting branch having a proportional regulator, • a first difference signal (Δn) is supplied to the proportional-integral regulator of the frequency regulating branch, said difference signal (Δn) being proportional to the difference of the desired rotational speed value (n s) from the motor rotational speed (n), • a second difference signal (ΔD +) is supplied to the proportional regulator of the torque limiting branch, said difference signal (ΔD +) being proportional to the difference of the torque threshold value (D G) from the motor torque when the current actual value of the motor torque exceeds the torque threshold value (D G) and otherwise having the value of zero, • a first actuating signal (F n) emitted by the proportional-integral regulator of the frequency regulating branch and a second actuating signal (F D) emitted by the proportional regulator of the torque limiting branch are multiplied in a multiplication member, wherein the actuating signal (F D) has the value 1 when the difference signal (ΔD +) has the value 0 and decreases with increasing value of the difference signal (ΔD +) from the value 1 to the value 0, and • a total actuating signal resulting from this is supplied to the PWM switching module, in order to preclude inadmissible work points of the servomotor, which would lead to immediate or gradual damage to the actuating mechanism because of high motor torque or motor rotational speed. • the control unit is additionally set up to limit the motor torque of the servomotor by limiting the motor current (I M) to a torque threshold value (D G), • the control unit has a PWM switching module as well as a control circuit for controlling the PWM switching module, wherein the control circuit comprises a frequency regulating branch having a proportional-integral regulator and a torque limiting branch having a proportional regulator, • a first difference signal (Δn) is supplied to the proportional-integral regulator of the frequency regulating branch, said difference signal (Δn) being proportional to the difference of the desired rotational speed value (n s) from the motor rotational speed (n), • a second difference signal (ΔD +) is supplied to the proportional regulator of the torque limiting branch, said difference signal (ΔD +) being proportional to the difference of the torque threshold value (D G) from the motor torque when the current actual value of the motor torque exceeds the torque threshold value (D G) and otherwise having the value of zero, • a first actuating signal (F n) emitted by the proportional-integral regulator of the frequency regulating branch and a second actuating signal (F D) emitted by the proportional regulator of the torque limiting branch are multiplied in a multiplication member, wherein the actuating signal (F D) has the value 1 when the difference signal (ΔD +) has the value 0 and decreases with increasing value of the difference signal (ΔD +) from the value 1 to the value 0, and • a total actuating signal resulting from this is supplied to the PWM switching module,