An accurate magnetic field analysis for estimating motor characteristics taking account of stress distribution in the magnetic core

Daikoku, Akihiro; Nakano, Mitsuru; Yamaguchi, S.; Tani, Yoshiaki; Toide, Yukari; Arita, Hideaki; Yoshioka, Takashi; Fujino, Chiyo

doi:10.1109/tia.2006.872952

Cited by 29 publications

(10 citation statements)

References 5 publications

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“…Several papers have dealt with this phenomenon in permanent magnet motors with an aluminum housing using combined stress and electromagnetic field (EMF) analyses [1]- [5]. However, there are few papers that deal with the core-loss increase in induction motors by the shrink fitting because the EMF analysis for the induction motors is considerably complex and difficult as compared with that for the permanent magnet motors according to the slip and large harmonic fields.…”

Section: Introductionmentioning

confidence: 99%

Loss Analysis of Induction Motors by Considering Shrink Fitting of Stator Housings

Yamazaki

Fukushima

2015

IEEE Trans. Magn.

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The losses of induction motors are analyzed using the combination of stress and electromagnetic field analyses that consider the effect of shrink fitting of stator housings. In the combined analyses, the variation in the stress effect with the angle between stress and flux vectors are taken into account using an equivalent stress. The calculated losses are compared with measured results in order to confirm the validity. It is revealed that not only the core loss, but also the primary copper loss and eddy current loss of the stator housing, increase by the shrink-fitting stress according to an increase in the reluctivity of the stator core.

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Section: Introductionmentioning

confidence: 99%

Loss Analysis of Induction Motors by Considering Shrink Fitting of Stator Housings

Yamazaki

Fukushima

2015

IEEE Trans. Magn.

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“…Figure 16 indicates that high compressive stress along the circumference direction is preferable to obtain low-cogging-torque motors. However, we should note that non-uniform high compressive stress may increase the pole-number component of cogging torque (4) . This result is consistent with Fig.…”

Section: Results Of Cogging Torque Analysis With Measured Bh Curvesmentioning

confidence: 93%

“…BH curves of electrical steel sheets were measured by a single sheet tester with a stress load system (4) . The schematic picture of the measurement system is shown in Fig.…”

Section: Methods Of Measurement and Analysismentioning

confidence: 99%

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Relation between Magnetic Properties of Stator Core and Cogging Torque in 8-pole 12-slot SPM Synchronous Motors

et al. 2015

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This paper discusses the influence of the magnetic properties of the stator core on cogging torque in 8-pole 12-slot surface-mounted permanent-magnet synchronous motors from the perspective of magnetic energy. In the finite element analyses of magnetic fields with modeled stator BH curves, cogging torque decreases drastically when the shape of magnets is changed from an arc to a semi-cylindrical structure. The influence of the stator BH curve on cogging torque is dominant in the low-cogging-torque motor with semi-cylindrical magnets. This is because magnetic energies in the gap and the magnets cancel each other and the magnetic energy in the stator core is dominant in the low-cogging-torque motor. Low maximum permeability and low magnetizing force in a high-B region are preferable for stator magnetic properties to reduce cogging torque. This is explained by the behavior of harmonics in the stator magnetic energy variation. The influences of steel grade, compressive stress, and punching in the stator core on cogging torque analyses are consistent with the results for the modeled BH curves. Low grade electrical steel sheets, high compressive stress, and magnetic annealing are effective to reduce cogging torque in the described motor design.

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“…The grain-oriented (anisotropic) steels are typically between 0.23 and 0.35 mm thick with rate of 2.9-3.2% silicon content. For example, the core of an automotive alternator or electric motor is made of nonoriented electrical steel, which is usually assumed to have isotropic magnetic properties [1]. However, the magnetic anisotropy is present in almost all non-oriented electrical steels.…”

Section: Introductionmentioning

confidence: 99%

Experimental evaluation of magnetic anisotropy in electrical steel sheets

Fryśkowski

2008

Journal of Magnetism and Magnetic Materials

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An accurate magnetic field analysis for estimating motor characteristics taking account of stress distribution in the magnetic core

Cited by 29 publications

References 5 publications

Loss Analysis of Induction Motors by Considering Shrink Fitting of Stator Housings

Loss Analysis of Induction Motors by Considering Shrink Fitting of Stator Housings

Relation between Magnetic Properties of Stator Core and Cogging Torque in 8-pole 12-slot SPM Synchronous Motors

Experimental evaluation of magnetic anisotropy in electrical steel sheets

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