Patent ID: 8768634

Claim:
A diagnosis method of defects in a motor, comprising: generating a vibration signal corresponding to a vibration of a motor by a vibration sensing module during operation of the motor; generating a sound signal corresponding to a sound of the operation of the motor by a sound sensing module during the operation of the motor; performing a data pre-processing procedure to pre-process the vibration signal, so as to eliminate noises of the vibration signal; performing an analyzing procedure by a processor to analyze a spectrum of the vibration signal pre-processed after the data pre-processing procedure, so as to retrieve a fundamental frequency in the spectrum of the vibration signal, wherein the spectrum of the vibration signal includes a speed spectrum and an acceleration spectrum, and the analyzing procedure comprising: obtaining a maximum value in the speed spectrum and a maximum value in the acceleration spectrum; dividing all spectrum values in the speed spectrum by the maximum value in the speed spectrum, and dividing all spectrum values in the acceleration spectrum by the maximum value in the acceleration spectrum; and retrieving the fundamental frequency which has a maximum normalized value in the speed spectrum or at the same position in both of the acceleration spectrum and the speed spectrum; retrieving spectrum features in the spectrum of the vibration signal according to the fundamental frequency; and performing a comparison procedure with a defect spectrum feature database according to the retrieved spectrum features, so as to determine a defect type of the motor.