Estimation of Suppressed Iron Loss by Stress-Relief Annealing in an Actual Induction Motor Stator Core by Using the Excitation Inner Core Method

Oka, M.; Ogasawara, Takato; Kawano, N; Enokizono, Masato

doi:10.1109/tmag.2014.2319237

Cited by 17 publications

(6 citation statements)

References 7 publications

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“…Further, I ex , N e , L e , N s , and S (m 2 ), are the excitation current, the number of turns of the excitation coil, the effective magnetic path length, the number of turns of the search coil, and the sectional area of the excitation inner core, respectively and v s is the induced voltage in the search coil. To evaluate W i , we estimated L e using the distribution of the magnetic flux density in the stator core which was analyzed using the 2D FEM [6]. The hysteresis loss W h (W/kg) and the eddy-current loss W e (W/kg) were calculated by the dual frequency separation method using W i50 when f ex is 50 Hz and W i100 when f ex is 100 Hz.…”

Section: Evaluation Of Iron Loss (W I )mentioning

confidence: 99%

“…However, a general method of evaluating the iron loss of the stator core has not been yet established. Therefore, we developed the excitation inner core method to evaluate the circumferential and axial distribution of the iron loss of the actual stator core [6][7][8]. In this study, we are presenting two variations on of the excitation inner core method.…”

Section: Introductionmentioning

confidence: 99%

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Evaluation of frame-induced compressive stress on the magnetic properties of stator cores using the excitation inner core method

Oka

Enokizono²

2018

Journal of Electrical Engineering

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To improve the efficiency of electric motors, we developed the excitation inner core method to evaluate the magnetic properties such as the iron loss of the actual stator core. After preparing two stator cores with a frame, we examined the frames influence of compressive stress by applying the standard and small excitation inner core methods to evaluate the iron loss of both stator cores having a frame. After removing the frames of the two stator cores, we evaluated the iron loss of two stator cores without the frames again by applying both methods.

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Section: Evaluation Of Iron Loss (W I )mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Evaluation of frame-induced compressive stress on the magnetic properties of stator cores using the excitation inner core method

Oka

Enokizono²

2018

Journal of Electrical Engineering

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“…Conventionally, sinusoidal excitation has been used to evaluate magnetic properties of magnetic materials. However, with the introduction of new semiconductor materials such as gallium nitride and silicon carbide, power electronics systems have been able to be driven at higher switching frequencies without compromising the system efficiency [1].…”

Section: Introductionmentioning

confidence: 99%

Current Measurement Issues of a High Frequency GaN Inverter in the MHz Order for Magnetic Characterization

Martínez

Suarez

2019

2019 IEEE Applied Power Electronics Conference and Exposition (APEC)

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Nowadays, there is a great interest in the industry for outstanding magnetic materials with low-loss properties. Moreover, with the introduction of novel Wide Bandgap devices, higher frequency operation has been demanded from these novel magnetic materials. Thereby, magnetic characterization for obtaining the iron loss behavior is essential. However, when a magnetic material is experimentally characterized, it is important to select a suitable measurement device, especially when a semiconductor inverter is powering the magnetic material and it is driven at a high switching frequency. Usually measurement devices have a good response in magnitude, but there is not a clear understanding about how their phase response at high frequencies measurements affects the characterization. Consequently, if the phase characteristics of a measurement device is not well-know, it is likely that the iron loss characterization will not be accurate. This paper studies the measurement issues when an iron loss characterization procedure is conducted. This study is carried out with the comparison of using clamp type current probes and high precision shunt resistors at high switching frequency excitations with a GANFET inverter. In addition, an experimental evaluation of iron losses at several switching frequencies is presented. As a result, the phase characteristics of several sensors was obtained, and it was possible to identify the inaccuracies that they can generate at a high frequency measurement.

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“…Therefore, an increase in rotating machine efficiency leads to huge amounts of electrical energy savings realized in megawatts [1]. Magnetic hysteresis curves are affected by the residual stress (mainly compressive stress) of the material [2,3]. The motor core includes a rotor core and a stator core, which are made from electrical steel sheets.…”

Section: Introductionmentioning

confidence: 99%

Magnetic properties of silicon steel sheet core with different processing stress

Matsui

Yun

2018

MATEC Web Conf.

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The motor core including a rotor core and a stator core, which is made from silicon steel sheets. Iron loss increases during fixation of the stator core, e.g., by interlocking, welding, and shrink fitting installation. In this paper, the magnetic properties changes by each processing such as wire cutting, punching, interlocking and shrink fitting are investigated. Iron loss of the toroidal cores using punching, interlocking and shrink fitting are increased from 1.16 W/kg to 1.56 W/kg (34.4 % increased) at 50Hz, and from 21.1 W/kg to 27.5 W/kg (30.3 % increased) at 400 Hz compared with iron loss of wire cut toroidal core.

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Estimation of Suppressed Iron Loss by Stress-Relief Annealing in an Actual Induction Motor Stator Core by Using the Excitation Inner Core Method

Cited by 17 publications

References 7 publications

Evaluation of frame-induced compressive stress on the magnetic properties of stator cores using the excitation inner core method

Evaluation of frame-induced compressive stress on the magnetic properties of stator cores using the excitation inner core method

Current Measurement Issues of a High Frequency GaN Inverter in the MHz Order for Magnetic Characterization

Magnetic properties of silicon steel sheet core with different processing stress

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