ปัญหาการบำรุงรักษาข้อผิดพลาดของโรเตอร์บาร์: การแจ้งเตือนเซ็นเซอร์สั่นสะเทือน

A 398 kW MV motor used for blower fans in a cement plant is exhibiting unusual behavior. Vibration monitoring indicates a persistent vibration amplitude over time. Maintenance teams are unaware of the problem, leading to repeated bearing replacements. This has occurred several times without a solution or explanation for the bearing failure. The motor even sputters upon startup. Beyond these symptoms, the explanation for the motor’s recurring failures remains unknown. The motor is used daily between repeated bearing replacements.

A factory condition monitoring cell called a Prescon is used to assess the condition of motors. The Prescon uses ESA (Electrical Signature Analysis) to evaluate the motor’s condition. Within minutes, the test revealed cracks in the rotor/end ring of the motor.

Electrical signature analysis (ESA) is an energy-supplied testing method in which voltage and current waveforms are recorded while a motor system is operating. To assess the integrity of a motor system, energy-supplied testing provides valuable information for AC and DC motors, generators, wound-rotor motors, synchronous motors, machine tool motors, and more.

The motor was then switched off and on again. A crack was found at one end of the ring, as shown below.

ESA technology enables users to test motors under load. ALL-TEST Pro’s ESA technology is a two-in-one device, a complete motor analyzer (ESA) and power quality (PQ) analyzer. Power testing (ESA mode) provides valuable motor health data for AC and DC induction motors, generators, wound rotor motors, synchronous motors, machine tool motors, and more. In PQ mode, it can be used for power data logging, harmonic analysis, voltage and current graphing, waveform viewing, deviation and waveform capture, transient capture, and event capture.