Comparison of Magnetic Characteristics of Powder Magnetic Core and Evaluation of Motor Characteristics

Enomoto, Yûji; Ito, M.; Masaki, Ryoso; Yamazaki, Katsuyuki; Asaka, Kazuo; Ishihara, Chio; Ohiwa, S.

doi:10.1541/ieejias.125.106

Cited by 20 publications

(10 citation statements)

References 2 publications

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“…A soft magnetic core has high hysteresis loss due to impurities in the iron powder and distortion produced during machining. When it is used in typical radial gap motors, the efficiency falls below that of a magnetic steel sheet at ordinary frequencies (a few hundred Hertz); but it has been reported [6] that at high frequencies above 1 kHz, eddy current loss is reduced and efficiency is improved.…”

Section: Introductionmentioning

confidence: 99%

“…Soft magnetic cores, in which a fine powder with an insulating coating is compression molded, are a soft magnetic material that has been attracting attention. There are many reports of their use in motors [1][2][3][4][5][6][7][8]. The structure of a soft magnetic core usually varies depending on the magnetic steel sheet (thin sheet that is insulation-coated and laminated) used in motors.…”

Section: Introductionmentioning

confidence: 99%

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High‐Efficiency Motors Using Soft Magnetic Cores

Tokoi

Kawamata

Enomoto

2014

Electrical Engineering Japan

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SUMMARYWe have developed a small and highly efficient axial gap motor whose stator core consists of a soft magnetic core. First, the loss sensitivities to various motor design parameters were evaluated by magnetic field analysis. Low sensitivity to the pole number and core dimensions (≤2.2 dB) was found for the total loss, which is the sum of the copper loss and the iron losses in the stator core and the rotor yoke. From this we concluded that to improve the motor efficiency, it is essential to reduce the iron loss in the rotor yoke and to minimize the other losses. With this in mind, a prototype axial gap motor was manufactured and tested. The motor has four poles and six slots. The motor is 123 mm in diameter and the axial length is 47 mm. The rotor has parallel magnetized magnets and a rotor yoke with magnetic steel sheets. The maximum measured rotor efficiency is 93%. This value roughly agrees with the maximum calculated efficiency of 95%. C⃝ 2014 Wiley Periodicals, Inc. Electr Eng Jpn, 189(2): 45-53, 2014; Published online in Wiley Online Library (wileyonlinelibrary.com).

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

High‐Efficiency Motors Using Soft Magnetic Cores

Tokoi

Kawamata

Enomoto

2014

Electrical Engineering Japan

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“…In the motor field, SMC core motors of new design with 3D magnetic circuits, which are difficult to realize with conventional magnetic steel sheet, are being developed [1][2][3][4][5][6][7]. They have the advantage of being formable to a three-dimensional (3D) structure of near net shape, and are beginning to be used for various applications.…”

Section: Introductionmentioning

confidence: 99%

Predicting the Life Span of Dies Used for Soft Magnetic Core Motors

Tokoi

Kobayashi

Nagashima

et al. 2015

Electrical Engineering Japan

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This paper describes a method of predicting the life span of the dies used in motor manufacture from soft magnetic composites (SMCs). In the present study, a clawtooth motor was used. The method involves performing a stress analysis of a die followed by fatigue testing of test pieces. In the analysis, the SMC was assumed to be in powder form and its yield function was derived by a simple method. In addition to the analysis, we describe a simpler and more effective method in which the properties of the SMC are treated as boundary conditions. In the fatigue tests, we used test pieces that simulated the shape and construction material of the die. To predict the life span of the die, we evaluate the SN diagram, which represents the relationship between the maximum stress and fatigue life with respect to the stress generated in the die. The life expectancy of a new die, which is about 100 cycles of use, is found to agree substantially with its actual life. Furthermore, we explain how to extend the life span of a die to the targeted life span, namely, more than 200,000 cycles of use, by changing its shape to reduce stress. C⃝ 2015 Wiley Periodicals, Inc. Electr Eng Jpn, 194(1): 37-47, 2016; Published online in Wiley Online Library (wileyonlinelibrary.com).

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“…SMC is made by high compression molding of more than 1000 MPa in the minute iron powder which is about 100 micrometers to which the insulating film was given [6]. Therefore, compared with the magnetic steel sheet, SMC has good productivity and low eddy current loss characteristics [3]- [5], [7]. Furthermore, it is possible to use SMC to produce machine designs which require three-dimensional (3D) flux paths and geometries [8] [9].…”

Section: Introductionmentioning

confidence: 99%

Proposal of 3D-stator structure using soft magnetic composite for PM motor

Okada

Dohmeki

Konushi³

2010

The XIX International Conference on Electrical Machines - ICEM 2010

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This paper presents 3-dimentional motor core structure using soft magnetic composite. This motor aims to provide high motor efficiency compared with lamination core motor. Soft magnetic composite is applied to the stator to decrease iron loss. Using the magnetic field analysis by 3-dimentional finite element method, we confirmed the usefulness of proposal structure. Furthermore, we studied in the actual motor, and effective results were obtained.Index Terms-soft magnetic composite, magnetic field analysis, PM motor, iron loss, hysteresis torque, overhang effect.

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Comparison of Magnetic Characteristics of Powder Magnetic Core and Evaluation of Motor Characteristics

Cited by 20 publications

References 2 publications

High‐Efficiency Motors Using Soft Magnetic Cores

High‐Efficiency Motors Using Soft Magnetic Cores

Predicting the Life Span of Dies Used for Soft Magnetic Core Motors

Proposal of 3D-stator structure using soft magnetic composite for PM motor

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