Patent ID: 8788231

Claim:
A method for detecting a rotation and a direction of the rotation of a rotor, the method comprising: arranging at least one damping element on the rotor; arranging two sensors, formed by a resonant circuit, offset to one another and at a distance from the rotor and the damping element; generating a scanning frequency; periodic short excitations of the sensors to vibrations in a rhythm of the scanning frequency; detecting decay times of the sensors; converting the decay times into rotation angle positions of the rotor; comparing consecutive rotation angle positions to determine the direction of rotation; observing consecutive rotation angle positions to recognize a full revolution; implementing a standardization, the implementation comprising: determining a maximum decay time of an undamped first sensor; determining a minimum decay time of a damped first sensor; standardizing the maximum decay time of the undamped first sensor to a value +1; standardizing the minimum decay time of the damped first sensor to a value −1; and repeating the standardization steps for a further sensor; and implementing measurements, the implementation comprising: measuring current decay times of the sensors in the rhythm of the scanning frequency; applying the standardization rules to the measured decay times of the sensors; forming a vector from the standardized values of the measured decay times and, starting from a zero point thereof, entering the vector into a coordinate system, dimensions of which correspond to a number of sensors used; determining a current vector angle; comparing the current vector angle to a value of a suitable preceding vector angle; determining the rotation of the rotor; determining the direction of rotation; and repeating the measurements in the rhythm of the scanning frequency.