Abstract
The lifetime of the stator winding insulation is reduced when operated with PWM inverters, since insulation degradation is accelerated due to increased thermal and electrical stresses on the motor. This paper focuses on a new approach for monitoring the condition of the stator insulation for failure-prone inverter-fed machines. The main concept of the proposed technique is to apply a variable frequency AC test voltage to the stator insulation using the inverter, to perform standard off-line insulation tests whenever the motor is not operating. This allows the stator insulation to be tested more frequently compared to off-line tests performed once every 3-6 yrs. during periodic maintenance. A method for testing the insulation with minimal modifications to the inverter circuit is proposed and verified experimentally. The results show that the proposed technique provides a simple low cost solution for detecting stator insulation degradation at an early stage for reliable operation of inverter-fed machine systems, since the insulation condition can be monitored frequently. This not only helps prevent forced outages and safety risks due to insulation breakdown, but also helps perform maintenance in an efficient manner since individual motor maintenance can be prioritized and scheduled based on its present condition.
| Original language | English |
|---|---|
| Title of host publication | Proceedings of 2008 International Conference on Condition Monitoring and Diagnosis, CMD 2008 |
| Pages | 143-150 |
| Number of pages | 8 |
| DOIs | |
| Publication status | Published - 2007 Dec 1 |
| Event | 2008 International Conference on Condition Monitoring and Diagnosis, CMD 2008 - Beijing, China Duration: 2008 Apr 21 → 2008 Apr 24 |
Other
| Other | 2008 International Conference on Condition Monitoring and Diagnosis, CMD 2008 |
|---|---|
| Country | China |
| City | Beijing |
| Period | 08/4/21 → 08/4/24 |
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Keywords
- AC electric machines
- Capacitance test
- Condition monitoring
- Diagnostics
- Dissipation factor
- Insulation resistance
- Inverters
- Predictive maintenance
- Stator insulation
ASJC Scopus subject areas
- Industrial and Manufacturing Engineering
- Safety, Risk, Reliability and Quality
Cite this
An inverter-embedded stator winding insulation quality assessment technique for AC machines. / Yang, Jinkyu; Cho, Jintae; Lee, Sang Bin; Jung, Hosung; Park, Young.
Proceedings of 2008 International Conference on Condition Monitoring and Diagnosis, CMD 2008. 2007. p. 143-150 4580250.Research output: Chapter in Book/Report/Conference proceeding › Conference contribution
}
TY - GEN
T1 - An inverter-embedded stator winding insulation quality assessment technique for AC machines
AU - Yang, Jinkyu
AU - Cho, Jintae
AU - Lee, Sang Bin
AU - Jung, Hosung
AU - Park, Young
PY - 2007/12/1
Y1 - 2007/12/1
N2 - The lifetime of the stator winding insulation is reduced when operated with PWM inverters, since insulation degradation is accelerated due to increased thermal and electrical stresses on the motor. This paper focuses on a new approach for monitoring the condition of the stator insulation for failure-prone inverter-fed machines. The main concept of the proposed technique is to apply a variable frequency AC test voltage to the stator insulation using the inverter, to perform standard off-line insulation tests whenever the motor is not operating. This allows the stator insulation to be tested more frequently compared to off-line tests performed once every 3-6 yrs. during periodic maintenance. A method for testing the insulation with minimal modifications to the inverter circuit is proposed and verified experimentally. The results show that the proposed technique provides a simple low cost solution for detecting stator insulation degradation at an early stage for reliable operation of inverter-fed machine systems, since the insulation condition can be monitored frequently. This not only helps prevent forced outages and safety risks due to insulation breakdown, but also helps perform maintenance in an efficient manner since individual motor maintenance can be prioritized and scheduled based on its present condition.
AB - The lifetime of the stator winding insulation is reduced when operated with PWM inverters, since insulation degradation is accelerated due to increased thermal and electrical stresses on the motor. This paper focuses on a new approach for monitoring the condition of the stator insulation for failure-prone inverter-fed machines. The main concept of the proposed technique is to apply a variable frequency AC test voltage to the stator insulation using the inverter, to perform standard off-line insulation tests whenever the motor is not operating. This allows the stator insulation to be tested more frequently compared to off-line tests performed once every 3-6 yrs. during periodic maintenance. A method for testing the insulation with minimal modifications to the inverter circuit is proposed and verified experimentally. The results show that the proposed technique provides a simple low cost solution for detecting stator insulation degradation at an early stage for reliable operation of inverter-fed machine systems, since the insulation condition can be monitored frequently. This not only helps prevent forced outages and safety risks due to insulation breakdown, but also helps perform maintenance in an efficient manner since individual motor maintenance can be prioritized and scheduled based on its present condition.
KW - AC electric machines
KW - Capacitance test
KW - Condition monitoring
KW - Diagnostics
KW - Dissipation factor
KW - Insulation resistance
KW - Inverters
KW - Predictive maintenance
KW - Stator insulation
UR - http://www.scopus.com/inward/record.url?scp=52149086747&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=52149086747&partnerID=8YFLogxK
U2 - 10.1109/CMD.2008.4580250
DO - 10.1109/CMD.2008.4580250
M3 - Conference contribution
AN - SCOPUS:52149086747
SN - 9781424416219
SP - 143
EP - 150
BT - Proceedings of 2008 International Conference on Condition Monitoring and Diagnosis, CMD 2008
ER -