Method for identifying instantaneous rotating speed frequency of motor rotor system

• Main Authors: HUANG XIN, LI WENSHUAI, WANG HONGCE, LIU SHUAI, QIU ZIZHEN, KONG ZHIGUO, ZHANG WEI, HE PENGLIN, HAN TAO, WANG FANG, CAI ZHITAO, CAO DONGDONG
• Format: Patent
• Language: Chinese; English
• Published: 18.07.2023
• Subjects: CALCULATING; COMPUTING; CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORSOR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER; COUNTING; ELECTRIC DIGITAL DATA PROCESSING; ELECTRICITY; GENERATION; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT; MEASURING; MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION,OR SHOCK; PHYSICS; TESTING

The invention provides a motor rotor system instantaneous rotating speed frequency identification method. The method comprises the following steps: S1, using a laser displacement sensor to collect a transient displacement vibration signal of a permanent magnet motor rotor system; s2, performing spectral analysis on the transient displacement vibration signal according to short-time Fourier transform to obtain a frequency domain signal; then based on a maximum value tracking method, extracting a high-order harmonic component related to a motor rotating speed fundamental frequency, and obtaining an instantaneous rotating speed frequency of the high-order harmonic component; and S3, calculating the instantaneous phase of the high-order harmonic component according to the instantaneous rotating speed frequency, and further calculating the instantaneous phase of the rotating frequency. The motor rotor system instantaneous rotating speed frequency identification method has the advantages that the maximum value trac