Abstract: A revolution counter includes a single sensor which scans movement of a rotary element and generates a raw signal commensurate with a rotary position of the rotary element for ascertaining one of at least three areas of angular ranges. Two of these areas include each a single continuous angular range, whereas a third area includes at least two angular ranges, which interrelate but are separated from one another. A power generation system delivers energy pulses to the sensor, when the rotary element rotates below a minimum value, so that a raw signal can be detected and the corresponding angular range area can be determined. The power generation system and the rotary element are so interconnected as to ascertain for at least part of the thus determined areas of angular ranges, by which of the angular ranges the rotary element is rotated, and to establish the number of revolutions based on the ascertained angular ranges.

Abstract: A revolution counter; includes a base body having a sensor arrangement and a power supply device which supplies energy to the sensor arrangement, and a rotary element connectable to a revolving member and rotating relative to the base body about a rotation axis. The rotary element includes a magnet arrangement, which so interacts with the power supply device that the sensor arrangement is supplied with energy during each revolution of the rotary element in at least three rotary positions of the rotary element regardless of a rotation speed of the rotary element to thereby allow the sensor arrangement to ascertain a rotary position of the rotary element. In order to prevent a transmission of mechanical forces from the rotary element to the base body, the rotary element is positioned with respect to the base body either without connection to the base body, or held by the base body at three-dimensional play.