Patent ID: 7978044
Filing Date: 2011-07-12
Classification: H01F

Abstract:
1. A transformer comprising: a frame type iron core that has first and second plate-shaped magnetic members laminated in the order based on the widths of the first and second plate-shaped magnetic members, the first and second plate-shaped magnetic members forming respective annular magnetic circuits, the first plate-shaped magnetic member having the largest width in the frame type iron core, the second plate-shaped magnetic members having plural different widths in the frame type iron core, the first plate-shaped magnetic member including three or more plate-shaped magnetic member units which have one width, each of the second plate-shaped magnetic members including two-plate-shaped magnetic member units which have one width, each plate-shaped magnetic member unit of the first plate-shaped magnetic member and the second plate-shamed magnetic members having magnetic member pieces respectively that form respective sides of the plate-shaped magnetic member, each of the magnetic member pieces having end surfaces, each adjacent pair of the end surfaces of the magnetic member pieces facing each other and being joined together to form a joint portion at each of corner portions of each plate-shaped magnetic member unit, the joint portion being formed in the position which is different in a direction of the magnetic path of the magnetic circuit every plate-shaped magnetic member unit, in the first plate-shaped magnetic member, three or more joint portions being formed per one corner portion of the first plate-shaped magnetic member and being shifted from each other, in each of the second plate-shaped magnetic members two joint portions being formed per one corner portion of each of the second plate-shaped magnetic members and being shifted from each other; and a coil that is wound around the frame type iron core and excites the frame type iron core when electricity is conducted through the coil, wherein in the frame type iron core, each plate-shaped magnetic member unit of the first plate-shaped magnetic member and the second plate-shaped magnetic members has a magnetic member piece on which a concave portion having the end surface is formed.