A SYSTEM FOR ASSESSMENT OF MULTIPLE FAULTS IN INDUCTION MOTORS

摘要

A system for assessment of multiple faults in induction motors, said motor motor being supplied from a 3-phase supply (100) using a variable frequency drive (VFD), said system comprising: a current sensor (102) for sensing a single phase stator current; an anti-aliasing filter (105) for subsequent conversion of sensed current into digital format using an analog to digital converter (106), said acquired signal consisting of a high magnitude fundamental component, fault frequency components, and noise and amplitude estimation block (107) for estimation of fundamental signal further conditioned with input signal to motor in order to obtain a conditioned input signal for estimation of slip and speed of motor to determine a fault search band correlative to fault frequency components, said fault frequency components estimated by means of a spectral estimator to determine if said motor comprises rotor faults, eccentric specific faults, bearing faults, and / or stator faults.