Laminated ballast core
US4602236A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 8, 1985 |
| Grant date | Jul 22, 1986 |
| Priority date | — |
| Expiry date | Feb 8, 2005 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01F27/245
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A laminated ballast core is provided comprising a plurality of nearly identically shaped lamination pieces. Each lamination piece is of a general L-shape and has a notch at the upper outside corner of the base section and a tab extending from the upper outside corner of the shorter side section. About one-half of the lamination pieces are aligned adjacent each other to form an upper lamination section. The other half of the lamination pieces are aligned adjacent each other to form a lower lamination section. The upper lamination section is placed on the lower lamination section such that the tabs and corresponding notches are in contact. The height of the tabs and depth of the notches are proportioned such that a gap of preselected width extends between the edge of the upper portion of the side sections and the adjacent portion of the base section.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.