VERFAHREN ZUR BESTIMMUNG DER DREHGESCHWINDIGKEIT EINES MOTORS UND COMPUTERSOFTWAREPRODUKT ZUR AUSFÜHRUNG DES VERFAHRENS

• Main Authors: SAARINEN, KARI, ORKISZ, MICHAL
• Format: Patent
• Language: German
• Published: 09.03.2006
• Subjects: INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT; MEASURING; MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION,OR SHOCK; PHYSICS; TESTING; TESTING STATIC OR DYNAMIC BALANCE OF MACHINES ORSTRUCTURES; TESTING STRUCTURES OR APPARATUS NOT OTHERWISE PROVIDED FOR

The present invention relates to a method of determining speed of rotation of a motor. The method involves collecting samples with a measuring sensor at a sampling frequency, set on the basis of mechanical vibration of the motor, for the duration of a measurement period and storing the samples in the memory of a data carrier as measurement data of a fixed format. The speed of rotation of the motor is determined from the measurement data by determining the cycle length of a periodic vibration signal in the time domain by means of a maximum likelihood estimate calculated by maximizing a maximum likelihood function adjusted to the measurement data, the speed of rotation being obtained from the frequency point where the maximum likelihood function obtains its maximum value.