Patent ID: 7212092

Claim:
A device for energy storage and energy transformation, comprising: a first coil former having a winding for connection to a supply voltage; a second coil former having a winding for connection to a high-voltage terminal; a magnetically active I core surrounded by the first coil former and the second coil former; and a peripheral core forming a magnetic circuit with the I core and enclosing a system including the first coil former and the second coil former; a permanent magnet positioned at a joint between the I core and the peripheral core; a clamped joint existing between the peripheral core and the I core, wherein; the peripheral core includes a through-recess in a circumferential extension thereof to accommodate an end area of the I core; the permanent magnet is positioned at an end area of the I core facing away from the end area inserted into the through-recess of the peripheral core; the permanent magnet is directly adjacent to the peripheral core; the peripheral core is in one piece; and the through-recess in an unassembled condition has a smaller size than the end area of the I core to be accommodated therein and is widenable to accommodate the end area of the I core.