Investigation of 2D Nano-Structured Winding Insulation for High Torque Density Medium-Voltage Motor

Nguyen, Hiep H.; Mirza, Arshiah Yusuf; Chen, Weiqiang; Liu, Yiqi; Ronzello, JoAnne; Chapman, John S.; Bazzi, Ali M.; Cao, Yang

doi:10.1109/access.2020.3047103

Cited by 14 publications

(6 citation statements)

References 10 publications

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“…Both the dielectric dissipation and dielectric constants of these composites are lower than the state-of-the-art micaceous insulation for rotating machines. 5,51…”

Section: Resultsmentioning

confidence: 99%

“…The dielectric constants of the composites are slightly higher than the neat epoxy and are as low as 4.4 over the entire studied temperature and frequency ranges. Both the dielectric dissipation and dielectric constants of these composites are lower than the state-of-the-art micaceous insulation for rotating machines 5,51.…”

mentioning

confidence: 90%

“…It has been demonstrated that by enhancing the thermal conductivity of the groundwall insulation material of rotating machines from 0.2 W m -1 K -1 to 0.7 W m -1 K -1 , the maximum temperature of the copper conductors drops by 40°C and a significant 26% increase in power density can be achieved. 5,6 Additionally, the operating temperature seriously impacts the device lifetime. When the operating temperature decreases by 10°C, the life expectancy of the insulation systems can be 2× longer 7 .…”

Section: Introductionmentioning

confidence: 99%

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Design of an experimental study of high through-plane thermal conductivity hybrid epoxy composite insulation with superior dielectric strength

et al. 2022

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“…Both the dielectric dissipation and dielectric constants of these composites are lower than the state-of-the-art micaceous insulation for rotating machines. 5,51…”

Section: Resultsmentioning

confidence: 99%

mentioning

confidence: 90%

Section: Introductionmentioning

confidence: 99%

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Design of an experimental study of high through-plane thermal conductivity hybrid epoxy composite insulation with superior dielectric strength

et al. 2022

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“…Breakdown strength is an important parameter for evaluating the insulation properties of composites under extreme electric fields 50–60 . The breakdown process of materials is the result of the movement of carriers under the electric field.…”

Section: Resultsmentioning

confidence: 99%

“…Breakdown strength is an important parameter for evaluating the insulation properties of composites under extreme electric fields. [50][51][52][53][54][55][56][57][58][59][60] The breakdown process of materials is the result of the movement of carriers under the electric field. When the carriers obtain sufficient energy and the number of carriers continues to increase, the current density in the dielectric will increase until electrical breakdown occurs.…”

Section: Thermal Properties Of Mica Tapementioning

confidence: 99%

Enhanced thermal conductivity and insulation properties of mica tape with BN coating via electrostatic spraying technology

Feng

Yang

et al. 2022

J of Applied Polymer Sci

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The bottleneck problem of the development of high‐voltage motors to a larger capacity can be solved if the thermal conductivity is improved without sacrificing the insulation characteristics of the main insulation material. In this paper, a spraying technology based on electrospinning is proposed that can evenly spray boron nitride (BN) with high thermal conductivity onto the surface of mica tape. With the increase in BN content, the insulation and thermal conductivity of mica tape are optimized to varying degrees. When the BN content reaches 2.25 wt%, the in‐plane conductivity increases from 1.6 to 2.7 w/(m K), while the out‐of‐plane conductivity increases from 0.17 to 0.26 w/(m K). Additionally, the direct‐current (DC) breakdown strength has increased from 90.6 to 96.9 kV/mm and the dielectric constant and dielectric loss are almost unchanged. Finally, through simulation verification, if the modified mica tape is applied to the main insulation of a synchronous motor, the operating temperature of the motor insulation will be reduced from 73.5 to 66.1°C. This study provides a new research idea for the preparation of high thermal conductivity insulating materials.

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A novel approach towards parametric assessment of reliability and resilience of high voltage mica‐based insulation systems by statistical analysis of experimental failure data

Negari,

Esmaeil Moghadam

2024

High Voltage

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Insulation systems in high‐voltage electric machines play a pivotal role in the reliable operation and longevity of the equipment. Mica‐based insulation materials have proven to possess and maintain excellent dielectric properties in the long run and prevent premature insulation degradation. Numerous qualifications tests, such as voltage endurance, are outlined in IEC and IEEE standards. The authors, however, take a different parametric approach, opting for reliability assessment of insulation systems using derived three‐parameter Weibull models. Therefore, instead of simple pass–fail criteria, empirical data is employed to determine failure rate probabilities quantitatively and objectively. Experimental data, including breakdown, dissipation factor, and partial discharge measurements, are used to construct the Weibull distribution model to predict fault and failure rates and calculate hazard functions. The rigorous examinations interpreted through the analytical model help assess insulation system resilience and particularly the impact of electrical field stress and mica content. Variation of electrical stress from 66.75 to 71.20 V/mil demonstrated how the mean time to failure of the system changed from 146.4 to 85.1 at 3 Un, hence identifying opportunities for design improvement and uncovering performance boundaries. Ultimately, the developed framework enhances comprehension of insulation system failure probabilities, guiding design decisions and ensuring a secure and reliable operation of electrical machines across applications.

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Investigation of 2D Nano-Structured Winding Insulation for High Torque Density Medium-Voltage Motor

Cited by 14 publications

References 10 publications

Design of an experimental study of high through-plane thermal conductivity hybrid epoxy composite insulation with superior dielectric strength

Design of an experimental study of high through-plane thermal conductivity hybrid epoxy composite insulation with superior dielectric strength

Enhanced thermal conductivity and insulation properties of mica tape with BN coating via electrostatic spraying technology

A novel approach towards parametric assessment of reliability and resilience of high voltage mica‐based insulation systems by statistical analysis of experimental failure data

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