| Presentation | 2020-07-03 High-speed mechanical crowbar switch used in discharge circuit for magnetic pulse welding of sheet metals Tomokatsu Aizawa, Kazuo Matsuzawa, Yuki Akedo, |
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| PDF Download Page |  PDF download Page Link |
| Abstract(in Japanese) | (See Japanese page) |
| Abstract(in English) | This high-speed mechanical switch consists of two sets of small Al contact sheets (2 pieces). The withstand voltage of the switch is about 6kV, and the operation time is about 8μs. The two sets of contact sheets are fixed side by side on an insulated 4-turn flat coil. The two sets are connected in series, and both ends are connected to both ends of the coil. The contact between the sheets is performed by rapidly applying a damped oscillating discharge current from a capacitor bank to the coil, and applying a high-density magnetic flux to the lower sheets of each set that is electromagnetically coupled to the coil. Electromagnetic forces act on the lower sheets, and these sheets collide with the upper sheets at high speed, closing the switch. The two sets of sheets are electromagnetically welded. When the discharge current reaches the maximum (about 27kA) and the switch is closed, the discharge current flowing through the coil commutates to the short circuit including the switch. The current flowing to the coil stops oscillating. We report the experimental results of such a high-speed mechanical switch. |
| Keyword(in Japanese) | (See Japanese page) |
| Keyword(in English) | Sheet metal / Magnetic pulse welding / High-speed mechanical switch / Crowbar switch / Capacitor bank / Flat coil |
| Paper # | EMD2020-1 |
| Date of Issue | 2020-06-26 (EMD) |
| Conference Information | |
| Committee | EMCJ / EMD / WPT |
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| Conference Date | 2020/7/3(1days) |
| Place (in Japanese) | (See Japanese page) |
| Place (in English) | Online |
| Topics (in Japanese) | (See Japanese page) |
| Topics (in English) | |
| Chair | Kensei Oh(Nagoya Inst. of Tech.) / Shinichi Wada(TMC System) / Toshio Ishizaki(Ryukoku Univ.) |
| Vice Chair | Atsuhiro Nishikata(Tokyo Inst. of Tech.) / Yoshiki Kayano(Univ. of Electro-Comm.) |
| Secretary | Atsuhiro Nishikata(Denso) / Yoshiki Kayano(NAIST) / (Fuji Electric) |
| Assistant | Nami Sasaki(Seiwa Electric MFG) / Hiroyoshi Shida(Tokin EMC Engineering) / Sho Muroga(Akita Univ.) / Yuichi Hayashi(ＮＡＩＳＴ) / Osamu Kagaya(AGC) / Yoshiaki Narusue(Univ. of Tokyo) |
| Paper Information | |
| Registration To | Technical Committee on Electromagnetic Compatibility / Technical Committee on Electromechanical Devices / Technical Committee on Wireless Power Transfer |
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| Language | JPN |
| Title (in Japanese) | (See Japanese page) |
| Sub Title (in Japanese) | (See Japanese page) |
| Title (in English) | High-speed mechanical crowbar switch used in discharge circuit for magnetic pulse welding of sheet metals |
| Sub Title (in English) | Withstand voltage about 6kV, operation time about 8μs |
| Keyword(1) | Sheet metal |
| Keyword(2) | Magnetic pulse welding |
| Keyword(3) | High-speed mechanical switch |
| Keyword(4) | Crowbar switch |
| Keyword(5) | Capacitor bank |
| Keyword(6) | Flat coil |
| 1st Author's Name | Tomokatsu Aizawa |
| 1st Author's Affiliation | Tokyo Metropolitan College of Technology(Tokyo Metropolitan College) |
| 2nd Author's Name | Kazuo Matsuzawa |
| 2nd Author's Affiliation | Tokyo Metropolitan College of Industrial Technology(Tokyo Metropolitan College) |
| 3rd Author's Name | Yuki Akedo |
| 3rd Author's Affiliation | Tokyo Metropolitan College of Industrial Technology(Tokyo Metropolitan College) |
| Date | 2020-07-03 |
| Paper # | EMD2020-1 |
| Volume (vol) | vol.120 |
| Number (no) | EMD-86 |
| Page | pp.pp.1-6(EMD), |
| #Pages | 6 |
| Date of Issue | 2020-06-26 (EMD) |