Method and device for calibrating a positioner system having an electronically commutated servomotor

A device for calibrating a positioner system including an electronically commutated servomotor and an actuator that is influenced by a counter force and is coupled to said servomotor, wherein a position of the actuator is detected in order to obtain a position variable, and wherein a commutation of the servomotor is performed in order to generate a motor magnetic field based on a rotor position that is ascertained with the aid of the position variable, the device being configured:

• to control the servomotor in such a manner that a first motor magnetic field of a first magnitude is generated, and to ascertain a first position variable for the position of the actuator that is aligned with the first motor magnetic field;
• to control the servomotor in such a manner that a second motor magnetic field of a second magnitude is generated, and to ascertain a second position variable for the position of the actuator that is aligned with the second motor magnetic field, wherein the directions of the first motor magnetic field and the second motor magnetic field are identical;
• based on the first position variable and the second position variable, to ascertain a position variable that indicates a position of the actuator under the assumption that the actuator is not influenced by a counter force;
• and
• to allocate the ascertained position variable to a rotor position that corresponds to the direction of the first and second motor magnetic field.

A positioner system, comprising:

• an electronically commutated servomotor;
• an actuator that is influenced by a counter force and is coupled to the servomotor;
• a position detector configured to detect a position of the actuator and to provide a position variable that indicates the position of the actuator;
• a control device configured to implement a commutation of the servomotor in order to generate a motor magnetic field based on the rotor position that is ascertained with the aid of the position variable;
• and
• a device configured to calibrate the positioner system, wherein the device causes the control device:
• to control the servomotor in such a manner that a first motor magnetic field of a first magnitude is generated, and to ascertain a first position variable for the position of the actuator that is aligned with the first motor magnetic field;
• and
• to control the servomotor in such a manner that a second motor magnetic field of a second magnitude is generated, and to ascertain a second position variable for the position of the actuator that is aligned with the second motor magnetic field, wherein the directions of the first motor magnetic field and the second motor magnetic field are identical;
• and
• wherein the device is configured:
• based on the first position variable and the second position variable, to ascertain a position variable that indicates a position of the actuator under the assumption that the actuator is not influenced by a counter force;
• and
• to allocate the ascertained position variable to a rotor position that corresponds to the direction of the first motor magnetic field and second motor magnetic field.