Diagnosis of motors using electrical analysis
While vibration testing has improved substantially in recent years, electrical testing remains limited, which is surprising as 50% of electric motor failures are caused by electrical rather than mechanical faults.
dB Vib has formed a partnership with the company PdMA Corporation, which has developed a measurement system for improving the reliability of electric motors through static (motor shutdown) and dynamic (motor under operation) testing.
The combination of static and dynamic testing makes it possible to conduct these inspections on all types of equipment. Dynamic testing (EMAXTM) is used to collect data without having to shut the machine down. Static testing, MCETM (Motor Circuit Evaluation), however is used for diagnosing motors when they are shutdown (for example, replacement motors in stock).
Finally, the data obtained from this combination of static and dynamic testing is used to confirm the source and cause of the electrical fault before making a quick decision on the specific preventive or corrective action to take.
There are six fault zones which must be analysed during an inspection or repair in order to correctly detect any possible faults and implement a real predictive maintenance policy
The six fault zones:
- Power quality.
- Power circuit.