Fujiwara, K.

Nakano, Masanori

Nakase, Tomoya

Takahashi, N.

English

Fujiwara, Koji

Takahashi, Norio

Okayama University Scientific Achievement Repository

EngineeringElectrical Engineering fieldsOkayama University Year 1999An open magnetic path type of singlesheet tester for measurement ofmagnetostriction of electrical steel sheetTomoya Nakase Masanori NakanoOkayama University Okayama UniversityKoji Fujiwara Norio TakahashiOkayama University Okayama UniversityThis paper is posted at eScholarship@OUDIR : Okayama University Digital InformationRepository.http://escholarship.lib.okayama-u.ac.jp/electrical engineering/109AN OPEN MAG NETlC PATHIYPE 0 F SINGLE SHEET TESlER FQB MEASUREME 1 'LE RI EELSHEET T. Nakase. M. Nakano. K. Fujiwara and N. Takahashi Department of Wecrrical and EIectroNc Engineering, O k a y m  Universitj 3-1-1 Tsushima, Okaym700-8530. Japan Lntroduction It is imponant to measure the magnetosaiction to investigate the acoustic noise of transformers. A closed magnetic path type of single sheet tester (SST) is usually used in the measurement of magnetostriction of elehcal steel sheet [I]. In this type, however, the m u r e m t  aauracy is very sensitive to the electlomagnwic force between s p e c h n  and yoke. Although an open magnetic path lype of SST having a single magnetizing winding is proposed to overcome such a difficulty, the uniformity of flux distribution is not sufficient [2]. lo this paper, an SST having main and compensating windings, which are excited individually, is proposed. The mnstrudon and feature of the proposed SST are described, and a technique for making the flux disaibution uniform by controlling the applied voltages of both windings is discussed. Tk magnetostrictions obtained from the open and closed lypes are compared. Mametlc nd th Wave rm on1 o Figure 1 shows the proposed open magnetic path type of SST. The compensating winding is wound at Ihe edges of main winding m get the uniform flux distribution. The compensa(ing winding is composed of three layers and they are connected in series. The configuration of windings is daermined with the help of magnetic field analysis. In order to establish a method of waveform control, the flux disnibution in a specimen is examined by using B coils wound directly on the specimen shown in Fig. I(b). Figure 2 shows the e f f su  of the amplitude Vm, of voltage U,,, of main winding on the maximum value B ,  and the phase angle e, of flux density when the amplitude V,,, of voltage ummp of compensating winding is f a d .  Both B ,  and 9, increase with increase of Vmb, and the rates of change of both quanti& at the center are larger than those at the edge. 7he effeas of Vcomp and a phase differena q W e e n  U, and U, m also m u r e d .  Su ' results are shown in Table 1. A&miing to those results. a method of waveform contro=eloped. Figure 3 shows fmally obtained waveforms of U,,, and U,, . Two of B coils shown in Fig. I@) (B1 at the edge and 86 at the center) are used to contmf the flux waveforms. A bighly- oriented siliwn steel sheet (11.5 27P100, thickness: 0.271nrn, W,,,,: S1.00Wkg) is used 85 a spsrmen. B. and fquency are se! at 1.W and 50Hz, respectively. There is a large difference W e e n  the fmal waveforms. Errors of B ,  and form factors FF of induced voltage are within f2% and f I%, respectively. The details of construction of SST. a method of waveform control and a digital measuring system will be described in the full paper. cOmDari9on of Mannetostrlctlons Obtained from Own and Closed Tvnes Figure 4 shows the comparison of magnetostrictions obtained from the open and closed types with various conditions. It is shown that the measurement aaurafy of the magnetostriction obtained from the open tyfe is comparable to that from the closed type with a glass plate between specimen and yoke [I] .  When there is no glass plate and B coils are wound dmt ly  on the specimen. the closed type gives the extremely large error. References [I]  T. Nakase et al., IEEE Trans. Magn., vo1.34, 110.4, pp.2072-2074, 1998. [21 T. Sasaki et al., Nqnlinenr Elecrromgnetic Sysrems. 10s Press, pp.764-767. 1996 Table 1. Effects of mslied voltazes flux density 430 (a) magnetizing windings -" z 3 L 0 2w . ., 5 -1.0 Ca) B wils wound dircctly on B specimen Rg. I. Open magnetic path type of single sheet (ester. 2.2 r 2.1 E 2.0 -E 1.9 1.8 1.7 [b) phase angle Fig. 2. Effect of amplitude of applied voltage of main winding on flux disuibution lVcomp = 4.5V. %= Meg). K. Fujiwara Tel: +81-86-251-8116 Fax: +8 I-86.251-8258 Okayama Universiry /Department of Electrical and Electronic Engineering 3-1-1 Tsushima, Okayama 700-8530. Japan E-mail fujiwara@eplab.elec.okayama-u.ac.jp Fig. 3. waveforms of applied voltages (27P100.Bm= 1.97. f=SOHz). 9- : wIhoYL wiIh + : WlIhOYf WiIhOYt 0 0.5 1.0 1.5 2.0 6, IT1 Fig. 4. Magnetoslirictianr (27PiW. f = MHz). 0-7803-5555-5/99/$10.00 Q19991EEE. BF-02 

An open magnetic path type of single sheet tester for measurement of magnetostriction of electrical steel sheet

PhysicsElectricity & Magnetism fieldsOkayama University Year 1999An open magnetic path type of singlesheet tester for measurement ofmagnetostriction of electrical steel sheetTomoya Nakase Masanori NakanoOkayama University Okayama UniversityK. Fujiwara N. TakahashiOkayama University Okayama UniversityThis paper is posted at eScholarship@OUDIR : Okayama University Digital InformationRepository.http://escholarship.lib.okayama-u.ac.jp/electricity and magnetism/31AN OPEN MAG NETlC PATHIYPE 0 F SINGLE SHEET TESlER FQB MEASUREME 1 'LE RI EELSHEET T. Nakase. M. Nakano. K. Fujiwara and N. Takahashi Department of Wecrrical and EIectroNc Engineering, O k a y m  Universitj 3-1-1 Tsushima, Okaym700-8530. Japan Lntroduction It is imponant to measure the magnetosaiction to investigate the acoustic noise of transformers. A closed magnetic path type of single sheet tester (SST) is usually used in the measurement of magnetostriction of elehcal steel sheet [I]. In this type, however, the m u r e m t  aauracy is very sensitive to the electlomagnwic force between s p e c h n  and yoke. Although an open magnetic path lype of SST having a single magnetizing winding is proposed to overcome such a difficulty, the uniformity of flux distribution is not sufficient [2]. lo this paper, an SST having main and compensating windings, which are excited individually, is proposed. The mnstrudon and feature of the proposed SST are described, and a technique for making the flux disaibution uniform by controlling the applied voltages of both windings is discussed. Tk magnetostrictions obtained from the open and closed lypes are compared. Mametlc nd th Wave rm on1 o Figure 1 shows the proposed open magnetic path type of SST. The compensating winding is wound at Ihe edges of main winding m get the uniform flux distribution. The compensa(ing winding is composed of three layers and they are connected in series. The configuration of windings is daermined with the help of magnetic field analysis. In order to establish a method of waveform control, the flux disnibution in a specimen is examined by using B coils wound directly on the specimen shown in Fig. I(b). Figure 2 shows the e f f su  of the amplitude Vm, of voltage U,,, of main winding on the maximum value B ,  and the phase angle e, of flux density when the amplitude V,,, of voltage ummp of compensating winding is f a d .  Both B ,  and 9, increase with increase of Vmb, and the rates of change of both quanti& at the center are larger than those at the edge. 7he effeas of Vcomp and a phase differena q W e e n  U, and U, m also m u r e d .  Su ' results are shown in Table 1. A&miing to those results. a method of waveform contro=eloped. Figure 3 shows fmally obtained waveforms of U,,, and U,, . Two of B coils shown in Fig. I@) (B1 at the edge and 86 at the center) are used to contmf the flux waveforms. A bighly- oriented siliwn steel sheet (11.5 27P100, thickness: 0.271nrn, W,,,,: S1.00Wkg) is used 85 a spsrmen. B. and fquency are se! at 1.W and 50Hz, respectively. There is a large difference W e e n  the fmal waveforms. Errors of B ,  and form factors FF of induced voltage are within f2% and f I%, respectively. The details of construction of SST. a method of waveform control and a digital measuring system will be described in the full paper. cOmDari9on of Mannetostrlctlons Obtained from Own and Closed Tvnes Figure 4 shows the comparison of magnetostrictions obtained from the open and closed types with various conditions. It is shown that the measurement aaurafy of the magnetostriction obtained from the open tyfe is comparable to that from the closed type with a glass plate between specimen and yoke [I] .  When there is no glass plate and B coils are wound dmt ly  on the specimen. the closed type gives the extremely large error. References [I]  T. Nakase et al., IEEE Trans. Magn., vo1.34, 110.4, pp.2072-2074, 1998. [21 T. Sasaki et al., Nqnlinenr Elecrromgnetic Sysrems. 10s Press, pp.764-767. 1996 Table 1. Effects of mslied voltazes flux density 430 (a) magnetizing windings -" z 3 L 0 2w . ., 5 -1.0 Ca) B wils wound dircctly on B specimen Rg. I. Open magnetic path type of single sheet (ester. 2.2 r 2.1 E 2.0 -E 1.9 1.8 1.7 [b) phase angle Fig. 2. Effect of amplitude of applied voltage of main winding on flux disuibution lVcomp = 4.5V. %= Meg). K. Fujiwara Tel: +81-86-251-8116 Fax: +8 I-86.251-8258 Okayama Universiry /Department of Electrical and Electronic Engineering 3-1-1 Tsushima, Okayama 700-8530. Japan E-mail fujiwara@eplab.elec.okayama-u.ac.jp Fig. 3. waveforms of applied voltages (27P100.Bm= 1.97. f=SOHz). 9- : wIhoYL wiIh + : WlIhOYf WiIhOYt 0 0.5 1.0 1.5 2.0 6, IT1 Fig. 4. Magnetoslirictianr (27PiW. f = MHz). 0-7803-5555-5/99/$10.00 Q19991EEE. BF-02 

21 T. Sasaki et al., Nqnlinenr Elecrromgnetic Sysrems.

Okayama University Digital Information Repository

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An open magnetic path type of single sheet tester for measurement of magnetostriction of electrical steel sheet

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