An Experimental Study on Prevention of Electromagnetic Fields using the New BDORT Hauling Machine(MK-III)

T.MatsubaraD.V.M.,Ph.D.(Assoc. Prof., Veterenian, Azabu University, School of Veterinary Medicine, Internal Medicine I), K.Kato(Kick), E.Matsuda(E-M-Technica) .M.Okada(Biosu)

 Purpose: To Establish an electromagnetic prevention method using the new BDORT  hauling machine(MK-III) and to devise a portable system for essay transportation.

Subjects: MK-III, Personal Computer (P.C) and portable system connected to an electromagnetic wave emission prevention device.

Method:  The examiner technique was substituted with the MK-III and the examiner finger power O-Ring Test was standardized to improve diagnostic accuracy. The main unit can be powered by both AC and DC sources. A portable system was designed with priority given to convenience and safety.

Result:  The BDORT method was applied using the new hauling machine and electromagnetic fields in the test environment and from the MK-III were measured to clarity the shielding effects of the electromagnetic(E.M) Shield(Zone).

①Personal computer system（DB451-DC8） 100VAC～19V  M, distance 30cm(ELF V/m)

ｎ

ａ）Test environment　   ｂ）P C　　　    ｃ）with Zone

±

2sd

　      3.12                           78.56                             2.68

     ±                                ±                                   ±

    0.66                             0.30                              1.92

Up/Down%　　　 （a-ｂ）96.03% ↑↑↑  　  (b-c)96.59%↓↓↓

②Drive system（DCservomotorDME44B8HPB）AC100V～24V　M, distance 30cm(ELF V/m)

ｎ=

ａ）Test environment　　   ｂ）Rectifiermotor　ｃ）with Zone

X

±

2sd

　         2.94                                    14.55                          2.92

       ±                                         ±                                ±

           1.02                                     0.42                            0.76

               Up/Down%             （a-ｂ）76.79% ↑↑   　　 (b-c)79.93%↓↓

③　PC with DC battery (Internal charge type) DC 24V　　M, distance 30cm(ELF V/m)

ｎ=

ａ）Test environment　　 ｂ）PC with out Zone　　　

X

±

2sd

　          3.18                                       2.75                 

      ±                                            ±                    

       0.90                                       0.54                  

               Up/Down%                （a-ｂ）13.52 ↓

 ④　Drive with DC battery（DCservomotorDME44B8HPB））DC24VM,distance 30cm(ELF V/m)

ｎ=

ａ）Test environment　ｂ）DC servomotor with out Zone

X

±

2sd

　     2.64                                       2.96                 

       ±                                            ±                    

           1.34                                        1.16

                         Up/Down%         （a-ｂ）10.8% ↑

 Discussion:  Electromagnetic field (ELF) was measured at a distance of 30cm  from each subject. The100V AC personal Computer system with the built- in - MK -III generated an ELF Strength of 3.12±0.66 V/m in the test environment and that from the personal computer was 78.56±0.30V/m.  When Zone was connected the value decreased by as much as 96.6% to 2.68±1.92 V/m. The drive system produced an ELF strength of 2.94±1.02 V/m in the test environment and that produced from the motor with a 24VDC rectifler was 14.55±0.42V/m. When Zone was connected, these values decreased by 79.93% to 2.92±0.76V/m. The ELF Strength of the personal computer with a 24V battery was 3.18±0.90V/m in the test environment but decreased by 13.52% to 2.75±0.54V/m when Zone was not connected The ELF Strength of the drive with a 24VDC battery was2.64±1.34V/m in the test environment but increased by  10.8%±1.16V/m  when Zone was not connected to the motor.

 Address correspond to: Azabu University, School of Veterinary Medicine, Internal Medicine Ⅰ 1-17-71,Fuchinobe Sagamihara City, Kanagawa-Pref 229-0006 JAPAN              TEL:+81-427-54-7111  FAX:+81-427-53-3395