Aging Time Effect on PD and Space Charge Behavior in magnet wire under High PWM Voltages

Zhou, Kai; Wu, G.N; Deng, Tao; Wu, Jiandong

doi:10.1109/elinsl.2006.1665281

Cited by 4 publications

(5 citation statements)

References 7 publications

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“…Space charge can also be measured by the pulsed electroacoustic (PEA) method [74], and this is further improved in [75]. Furthermore, [76] implements the thermally stimulated current (TSC) method to measure space charge parameters in magnet wires.…”

Section: Accmulation and Influence Of Space Chargementioning

confidence: 99%

“…The accumulation of space charge in insulation traps will influence the electric stress distribution, then change the PD characteristics that cause insulation degradation [1,73,74,[76][77][78][79][80]. Space charge can affect the electric stress in different aspects.…”

Section: Accmulation and Influence Of Space Chargementioning

confidence: 99%

“…14 (a), when there is no PD activity, the electric stress in the insulation bulk and air gap is dependent on the dielectric constant of insulation material [1,78]. Finally, for twisted pair, when the PDIV is achieved, PDs will introduce space charge and influence the electric stress in the air gap, which would change the probability of subsequent PDs [76][77][78]80]. These factors will interact together to change the electric field distribution.…”

Section: Accmulation and Influence Of Space Chargementioning

confidence: 99%

“…To maintain sound motor health condition, various measures can be considered to reduce insulation degradation [1,26,[74][75][76][77][78][79][80][81][82][83][84][87][88][89]. The connecting cable can be shortened to reduce voltage overshoots.…”

Section: Solutions For Premature Insulation Failurementioning

confidence: 99%

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Motor Winding Insulation Degradation Under Repetitive Voltage Pulses

Yang,

Phung

2024

IEEE Access

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Variable speed drives (VSDs) are widely utilized to control motors such as pumps, compressors, fans, etc. However, the endurance of motor winding insulation under repetitive voltage pulse excitation is weakened, resulting in premature failure and shortening the expected operating life. This article reviews the literature of investigations spanning the last two decades on the problem. Researchers have focused on different aspects to explain this from a particular angle. The precise mechanism is complicated as a number of interacting factors contribute to premature insulation failure. Insulation degradation in motors can be attributed to thermal, mechanical, chemical, and electrical stress. It seems that space charge accumulation and partial discharge (PD) are the two main influences; the former can exacerbate the electric stress distribution whilst the latter promotes insulation deterioration.

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Section: Accmulation and Influence Of Space Chargementioning

confidence: 99%

Section: Accmulation and Influence Of Space Chargementioning

confidence: 99%

Section: Accmulation and Influence Of Space Chargementioning

confidence: 99%

Section: Solutions For Premature Insulation Failurementioning

confidence: 99%

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Motor Winding Insulation Degradation Under Repetitive Voltage Pulses

Yang,

Phung

2024

IEEE Access

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“…There are about 37% of traction motor failures resulting from insulation failures (Zhou et al, 2006). The reliability of insulation has a direct effect on the safety and performance of high speed trains.…”

Section: Introductionmentioning

confidence: 99%

Optimal condition-based maintenance strategy under periodic inspections for traction motor insulations

Zhang

Huang

et al. 2015

J. Zhejiang Univ. Sci. A

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Insulation failure is a crucial failure mode of traction motors. Insulation deteriorates under both fatigue load and shock. This paper focuses on proposing an optimal insulation condition-based maintenance strategy. By combining the information obtained from periodic inspections with historic life information, an integrated model of time-based maintenance and condition-based model is proposed, in which random shocks following Poisson process are also taken into account. In this model we define that insulation has three states: normal state, latent failure state, and functional failure state. Normal state and latent failure state differ in their operating cost, proneness to functional failure, and survival probability under extreme shocks. Preventive maintenance (PM) will be launched if an inspection result exceeds the threshold or if the operating time reaches the critical age. One operating cycle ends as soon as a preventive maintenance or a corrective maintenance is completed. Moreover, an optimization model is established, which takes minimal cost per unit time as the objective, and inspection interval and critical age as the optimization variables. Finally, a numerical example illustrates the analytic results.

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