File:Double spring interrupter.jpg
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Summary[edit]
| Description |
English: An interrupter or contact breaker on an induction coil from 1907. The interrupter was a vibrating spring contact on an induction coil that served to repeatedly break the DC primary current to create the magnetic flux changes in the coil necessary to induce voltage in the secondary. It is mounted on the end of the coil next to the iron core. When the primary current is turned on, it creates a magnetic field in the iron core. This pulls the cylindrical iron armature piece on the vertical spring arm toward the core, opening the switch contacts (right) in the primary circuit. The magnetic field in the coil disappears, and the spring pulls the armature back, closing the contacts again. This cycle is repeated 20-40 times per second. This type is called a double spring interrupter, and was widely used on more powerful coils that produced 6 to 10 inch sparks (source, p. 94). The higher primary currents in these coils created arcs that tended to weld the contacts together. The double spring interrupter reduced arcing by opening the contacts faster. When the armature first begins to move toward the core under the attraction of the magnetic field, the contacts are held closed by the second vertical spring (center). The contacts do not open until the armature arm strikes the stop at the end of the horizontal adjustment screw. At this point it is moving rapidly, so it pulls the contacts open quickly. If the contacts do get welded together, the "hammering" force of the armature hitting the stop breaks them open again. A cylindrical brass spacer is visible attached to the end of the core opposite the armature. It is there to prevent the armature from sticking to the end of the core due to residual magnetism in the core, if it gets too near. |
| Date | before 1907 |
| Source | Downloaded April 18, 2013 from Archibald Frederick Collins (1908) The Design and Construction of Induction Coils, Munn and Co., New York, p. 98, fig. 69 on Google Books |
| Author | Unknown author |
Licensing[edit]
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This media file is in the public domain in the United States. This applies to U.S. works where the copyright has expired, often because its first publication occurred prior to January 1, 1929, and if not then due to lack of notice or renewal. See this page for further explanation.
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
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| current | 17:46, 18 April 2013 | | 740 × 765 (81 KB) | Chetvorno (talk | contribs) | User created page with UploadWizard |
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