Evaluation of the Iron Loss of the Actual Stator Core to Achieve High Efficiency of the Rotating Machine

Oka, M.; Kanada, Tsugunori; Kai, Takami; Enokizono, Masato

doi:10.4028/www.scientific.net/msf.670.447

Cited by 7 publications

(5 citation statements)

References 2 publications

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“…[1][2][3]. This problem is referred to as the building factor problem [4][5]. This building factor problem occurs in the stator core of the high-speed motor as well.…”

Section: Introductionmentioning

confidence: 99%

Building Factor Evaluation of the Stator Core Made of Ultrathin Electrical Steel Sheet for the High-Speed Motor

Oka

Enokizono²,

Mori³

et al. 2018

MSF

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We are developing a low-loss stator core for high-speed and small-size motors using an ultrathin electrical steel sheet. This stator core for a high-speed motor was produced using a 0.08mm-thick ultrathin electrical steel sheet. Additionally, in order to evaluate the iron loss of the high-speed motor stator core, we constructed a high-speed building factor evaluation system. This evaluation system is composed of high-speed A/D converters, a D/A converter, and a high-speed power amplifier. TheB-Hcurve and the iron loss of the high-speed motor stator core (0.08mm_Core), which was made of the 0.08mm-thick ultrathin electrical steel sheet, were measured using the outer excitation method and the high-speed building factor evaluation system. The iron loss of the 0.08mm_Core was about 66% of the iron loss of the ordinary-speed motor stator core (the 0.35mm_Core) which was made of a 0.35mm-thick electrical steel sheet. Each iron loss in two kinds of cores was measured using the outer excitation method at the excitation frequency (fex) 1000Hz and the maximum excitation magnetic flux density (Bexmax) 1.0T. From experimental results, the iron loss of the 0.08mm_Core in the high frequency excitation was very small.

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“…[1][2][3]. This problem is referred to as the building factor problem [4][5]. This building factor problem occurs in the stator core of the high-speed motor as well.…”

Section: Introductionmentioning

confidence: 99%

Building Factor Evaluation of the Stator Core Made of Ultrathin Electrical Steel Sheet for the High-Speed Motor

Oka

Enokizono²,

Mori³

et al. 2018

MSF

Self Cite

View full text Add to dashboard Cite

show abstract

“…As a result, iron loss of the stator core of the completed rotating machine increased by 20% or more compared with iron loss of the electrical steel sheet. The circumferential iron loss distribution of the stator core was changed by the influence of the manufacturing process in the actual stator core [7][8].…”

Section: Introductionmentioning

confidence: 99%

Evaluation of the Iron Loss Distribution of the Actual Stator Core Using Small Excitation Inner Cores

Oka

Shimada

Kawano

et al. 2012

MSF

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To obtain the basic data to manufacture the highly effective rotating machine, the axial iron loss distribution of an actual stator core of the complex structure was evaluated by using the small excitation inner core. The laminated thickness of this small excitation inner core is approximately 1/6 of the thickness of the stator core. Therefore, the circumferential iron loss distribution of the stator core and the axial iron loss distribution of a stator core can be measured by using this small excitation inner core. Then, to compare the difference of the axial iron loss distribution in the stator core, we investigated the axial iron loss distribution in the actual stator core after two manufacturing processes, the laminating process and the shrink fitting process. The iron losses were measured in three places (the edge, the quarter part, and the center) of two stator cores. As a result of our investigation, the axial iron loss distribution in the actual stator core clearly changed. This paper reports on the axial iron loss distribution in two manufacturing processes in two actual stator cores measured by using the small excitation inner core.

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“…In order to use electrical energy efficiently, demands for development of high-efficiency motors are increasing [1][2]. However the local magnetic phenomenon in constructed motor cores has not yet been understood sufficiently.…”

Section: Introductionmentioning

confidence: 99%

Measurement of Local Vector Magnetic Properties in Three-Phase Induction Motor Model Core with a Small-Sized Vector Hysteresis Sensor

Kai

Aihara

Todaka

et al. 2012

MSF

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Evaluation of the Iron Loss of the Actual Stator Core to Achieve High Efficiency of the Rotating Machine

Cited by 7 publications

References 2 publications

Building Factor Evaluation of the Stator Core Made of Ultrathin Electrical Steel Sheet for the High-Speed Motor

Building Factor Evaluation of the Stator Core Made of Ultrathin Electrical Steel Sheet for the High-Speed Motor

Evaluation of the Iron Loss Distribution of the Actual Stator Core Using Small Excitation Inner Cores

Measurement of Local Vector Magnetic Properties in Three-Phase Induction Motor Model Core with a Small-Sized Vector Hysteresis Sensor

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