Method for detecting the rotation and direction of rotation of a rotor

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.