Analysis and Experiments for Thermal Stress of Totally Impregnated Stator Windings

Hakamada, Takeshi; Kashiwamura, Yoshikiyo; Amagi, Shigeo

doi:10.1109/tei.1983.298684

Cited by 6 publications

(2 citation statements)

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“…The rated power of a motor is determined by thermal stress in some ways, temperature rise and some special structural design may lead to structural failure during the operation. Therefore, in the proceeding of the motor design, besides considering the temperature limits, the thermal stress of some key parts of the motor should be calculated and checked for satisfying the requirements of functionality and safe (Nathenson et al , 1986; Hakamada et al , 1983; Cannistra et al , 1993).…”

Section: Introductionmentioning

confidence: 99%

Investigation of rotor thermal stress in squirrel cage induction motor with broken bar faults

Xie

Wang

Shan

et al. 2016

COMPEL

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Purpose Thermal stress of the rotor in a squirrel cage induction motor is generated due to the temperature rise, and the structure of the rotor will be destroyed if the stress acted on the rotor exceeds its limits, so the thermal stress is also one of the main causes led to broken bar fault. The purpose of this paper is to report the thermal stress coupled analysis for the induction motor with healthy and faulty rotor, and to find the variation tendency of the temperature and thermal stress due to broken bars, and the part most likely to break in the rotor as a result of the thermal stress load are identified. Design/methodology/approach The steady temperature and thermal stress of the rotor in the case of the healthy and faulty conditions are calculated by finite element method, and the 3D model of the motor used in the experiments is established and the experimental results are presented for both healthy and faulty machines. Findings The influence of the broken bars fault on the motor thermal profile and thermal stress can be found, and it explains why the breaking point always appears in the joint of the bars and end rings. Originality/value The paper presents the 3D thermal stress coupled model and performance characteristics of induction motor with broken bars. The reasonable constraint is established according to the contact of components each other, and more reasonable fracture location is selected. The results obtained by the simulation model are in a good agreement with practical situation, because the effect of skewed rotor were taken into consideration in the process of simulation.

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Section: Introductionmentioning

confidence: 99%

Investigation of rotor thermal stress in squirrel cage induction motor with broken bar faults

Xie

Wang

Shan

et al. 2016

COMPEL

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“…Compared to the established polymer based varnishes these loaded epoxies tend to be viscous making impregnation difficult, can become brittle under temperature cycling and are not available in the highest temperature classes. Thus if high temperatures and significant mechanical stress or vibration are envisaged during the motor's operation, more established varnished based impregnation systems may be preferred [7].…”

Section: Introductionmentioning

confidence: 99%

Impact of slot shape on loss and thermal behaviour of open-slot modular stator windings

Wróbel

Williamson

Simpson

et al. 2015

2015 IEEE Energy Conversion Congress and Exposition (ECCE)

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This paper presents results from an investigation into the optimal design of an open-slot, modular stator winding. The impact of the stator slot shape on the winding temperature rise is explored, taking account the distribution of loss that occurs in the open slot winding, including ac effects, and the heat transfer characteristics from the winding assembly into the stator core pack. The application focus is a single-layer, concentrated wound brushless PM machine, however the work is applicable to other machine formats. Alternative stator lamination profiles are compared; the commonly used parallel sided tooth with a trapezoidal slot, and a parallel sided slot with a trapezoidal tooth. The investigation includes the development of a reduced order thermal model representation of the stator. This model is employed to undertake coupled loss and thermal analyses to provide more accurate comparisons of the designs accounting for ac and temperature effects. The experimental and theoretical findings indicate the parallel sided slot design will result in a 37 o C lower winding temperature or an 11% increase in torque at the intended machine operation point.

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Comparison of constant stress and constant cycle tests for thermal evaluation of insulation systems

Hakamada

1984

Electrical Engineering Japan

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Analysis and Experiments for Thermal Stress of Totally Impregnated Stator Windings

Cited by 6 publications

References 0 publications

Investigation of rotor thermal stress in squirrel cage induction motor with broken bar faults

Investigation of rotor thermal stress in squirrel cage induction motor with broken bar faults

Impact of slot shape on loss and thermal behaviour of open-slot modular stator windings

Comparison of constant stress and constant cycle tests for thermal evaluation of insulation systems

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