Wyniki wyszukiwania - BazTech

1

3-D optimal design of laminated yoke of billet heater for rolling wire rod using ON/OFF method

Takahashi N., Nakazaki S., Miyagi D., Uchida N., Kawanaka K., Namba H. H.

Archives of Electrical Engineering

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2012

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Vol. 61, nr 1

115-123

EN

The optimization method using the ON/OFF sensitivity analysis has an advantage hat an epoch-making construction of magnetic circuit may be obtained. Therefore, it is attractive for designers of magnetic devices. We have already developed the ON/OFF method for the optimization of a static magnetic field problem, and the effectiveness is verified by applying it to the optimization of magnetic recording heads. In this paper, the ON/OFF sensitivity method is extended to the optimization of the eddy current problem using the adjoint variable. The newly developed ON/OFF method is applied to the determination of the optimal topology of the yoke of the billet heater for rolling wire rod. As a result, the optimal shape of yoke, which we could not imagine beforehand can be obtained. It is shown that the local heating of the yoke was reduced without decreasing the heating efficiency.

2

Measurement of Magnetic Properties of Grain-Oriented Electrical Steel Sheet Using 2D Single Sheet Tester

Mori Y., Miyagi D., Nakano M., Takahashi N.

Przegląd Elektrotechniczny

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2011

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R. 87, nr 9b

47-51

EN

We have already reported the accuracy of measurement of 2D magnetic properties of non-oriented electrical steel sheet using a novel SST. In this paper, magnetic properties under alternating and rotating magnetic flux of grain-oriented sheet are measured. The accuracy of measurement in the case of grain-oriented sheet is examined by comparing the measured results using 2D-SST with those using an ordinary SST under alternating flux excitation. The effect of positioning error of orthogonal B and H coils on measurement accuracy is also discussed.

PL

Oceniono dokładność badania blachy zorientowanej przy wykorzystaniu testera 2D SST. W celu oceny niepewności wyniki porównano z rezultatami otrzymanymi przy wykorzystaniu konwencjonalnego testera SST. Przedyskutowano problem błędu pozycjonowania czujników.

3

Examination of Magnetic Properties of Several Magnetic Materials at High Temperature

Morishita M., Takahashi N., Miyagi D., Nakano M.

Przegląd Elektrotechniczny

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2011

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R. 87, nr 9b

106-110

EN

In order to accurately design magnetic devices which are used at high temperature, it is necessary to understand the behaviour of several magnetic materials at high temperature. In this paper, the magnetic properties of several magnetic materials until Curie temperature are measured. It is shown that the change of iron loss of rolled steel (SPCC and SS400) with the temperature is more remarkable than that of electrical steel sheet.

PL

W pracy przedstawiono właściwości magnetyczne niektórych materiałów w wysokiej temperaturze. Zmiana strat blachy walcowanej SPCC I SS400 jest znacznie większa niż ma to miejsce w przypadku blach elektrotechnicznych.

4

Study on measurement method of 2 dimensional magnetic properties of electrical steel using diagonal exciting coil

Miyagi D., Yunoki Y., Nakano M., Takaqhashi N.

Przegląd Elektrotechniczny

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2009

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R. 85, nr 1

47-51

EN

In order to improve the measurement accuracy of the 2-D SST (2 dimensional single sheet tester), we examined the measurement region of flux density B and magnetic field strength H, and the effect of stress caused by the supporting jig. By considering these factors, the measurement accuracy of iron loss under rotating flux at high flux density condition was improved.

PL

W celu poprawy dokładności pomiaru 2D SST (two-dimensional single sheet tester) zbadano obszar pomiarowy indukcji i pola magnetycznego, a także wpływ naprężeń mechanicznych wprowadzonych przez system mocowania próbki. Uwzględnienie tych czynników umożliwiło poprawę dokładności pomiaru strat mocy w warunkach przemagnesowania obrotowego.