Device and method for determining a rotational speed of a rotating roller element

A device for determining a rotational frequency of a roller body rotating about an axis of rotation and to which the device is attachable, the device comprising:

• an acceleration sensor;
• and
• an electronic processing unit, wherein the processing unit is configured to:
• detect an acceleration signal of the acceleration sensor that occurs in a first time span and that corresponds to an acceleration that is in a first direction that extends (a) in a radial direction relative to the axis of rotation or (b) perpendicularly to the axis of rotation and to the radial direction;
• low-pass filter and high-pass filter the detected acceleration signal to obtain a filtered acceleration signal;
• and
• ascertain a frequency of the filtered acceleration signal, which corresponds to the rotational frequency of the roller body.

A roller body comprising a device that is configured to determine a rotational frequency of the roller body when the roller body rotates about an axis of rotation, the device comprising:

• an acceleration sensor;
• and
• an electronic processing unit, wherein the processing unit is configured to:
• detect an acceleration signal of the acceleration sensor that occurs in a first time span and that corresponds to an acceleration that is in a first direction that extends (a) in a radial direction relative to the axis of rotation or (b) perpendicularly to the axis of rotation and to the radial direction;
• low-pass filter and high-pass filter the detected acceleration signal to obtain a filtered acceleration signal;
• and
• ascertain a frequency of the filtered acceleration signal, which corresponds to the rotational frequency of the roller body.

A method for determining a rotational frequency of a roller body rotating about an axis of rotation, the method comprising:

• detecting an acceleration signal of an acceleration sensor of or attached to the roller body, wherein the acceleration signal occurs in a first time span and corresponds to an acceleration that is in a first direction that extends (a) in a radial direction relative to the axis of rotation or (b) perpendicularly to the axis of rotation and to the radial direction;
• low-pass filtering and high-pass filtering the detected acceleration signal to obtain a filtered acceleration signal;
• and
• ascertaining a frequency of the filtered acceleration signal, which corresponds to the rotational frequency of the roller body.