Capacitive angle-of-rotation measurement system and method for adapting a capacitive angle-of-rotation measurement system

A capacitive rotary angle measuring system for detecting a rotary movement of a shaft, the capacitive rotary angle measuring system comprising:

• a capacitive sensor unit comprising,
• a transmitting electrode arrangement,
• a receiving electrode arrangement which is capacitively coupled to the transmitting electrode arrangement, and
• a rotatable coupling device which is co-rotatably mountable with the shaft and which is configured to vary an electric capacity between the receiving electrode arrangement and the transmitting electrode arrangement in response to a rotational position of the rotatable coupling device;
• a carrier signal generator which is electrically connected to the transmitting electrode arrangement and which is configured to generate an electrical carrier signal with a carrier signal frequency which is specified by a carrier signal frequency value and to apply the electrical carrier signal to the transmitting electrode arrangement;
• an evaluation unit which is electrically connected to the receiving electrode arrangement and which is configured to sense an electric measurement signal generated at the receiving electrode arrangement by applying the electrical carrier signal to the transmitting electrode arrangement and to determine a current rotary angle measurement value by evaluating the electric measurement signal;
• a carrier signal adaptation unit which is provided with an interference frequency value via a data storage during an operation and which is configured to adapt the carrier signal frequency value based on the interference frequency value;
• an interference frequency detection unit which is configured to automatically determine the interference frequency value and to provide the interference frequency value determined to the carrier signal adaptation unit;
• and
• a data interface which is configured so that the current rotary angle measurement value can be read out via an external readout device,
• wherein,
• the interference frequency detection unit is connected to the data interface and is further configured,
• to detect a readout frequency with which the current rotary angle measurement value is read out via the data interface, and
• to determine the interference frequency value based on the readout frequency which is detected.