Description:Please see attached ,

We Claim:

1. A transformer core, comprising:
a first yoke (2),
a second yoke (4),
a column (6) having a column main axis (8) and extending between the first yoke (2) and
the second yoke (4), and
an elongate clamping structure (10) comprising an elongate rigid member (12) having a
rigid member main axis (14),
wherein the column (6) includes an elongate opening (16) having an opening main axis
(18) which is oriented transversal with respect to the column main axis (8),
wherein the rigid member (12) is positioned within the elongate opening (16) such that
the rigid member main axis (14) is oriented parallel to the opening main axis (18),
wherein the elongate clamping structure (10) comprises a first end portion (20) and an
opposing second end portion (22), wherein the first and second end portions (20, 22) are
configured to compress a portion of the column (6) which surrounds the clamping structure
(10),
wherein the first end portion (20) and/or the second end portion (22) of the elongate
clamping structure (10) comprises a fixing member (24, 24´) having a conical shaped head
portion (26, 26´),
wherein the elongate opening (16) comprises at least one conical end portion (30, 30´)
which is shaped correspondent to the conical shaped head portion (26, 26´) of the fixing
member (24, 24´), and
wherein the transformer core further comprises at least one washer (34) positioned
around the conical shaped head portion (26, 26´) of the fixing member (24, 24´) and arranged
between the conical shaped head portion (26, 26´) and the at least one conical end portion
(30, 30´) of the elongate opening (16).
2. The transformer core according to claim 1, wherein the transformer core is designed
such that the conical shaped head portion (26, 26´) of the fixing member (24, 24´) is positioned
completely within the elongate opening (16).
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3. The transformer core according to claim 1 or 2, wherein the fixing member (24, 24´)
comprises a screw which is screwable connected to the rigid member (12).
4. The transformer core according to any of the preceding claims, , wherein the at least
one washer is made from an electrically insulating material.
5. A transformer core according to any of the preceding claims, wherein the elongate
clamping structure (10) further comprises an insulation tube (32) which is positioned between
the rigid member (12) and an inner surface of the elongate opening (16) and configured to
effectuate an isolation between the rigid member (12) and the column (6).
6. The transformer core according to claim 5, wherein the washer is formed as a part of
the insulation tube (32).
7. The transformer core according to claim 5, wherein the washer is positioned between
the conical shaped head portion (26, 26´) of the fixing member (24, 24´) and the insulation
tube (32).
8. The transformer core according to any of the preceding claims, further comprising at
least one further elongate clamping structure (10´, 10´´, 10´´´) which is constructed analog to
the first mentioned elongate clamping structure 10, wherein preferably, the elongate rigid
member of the at least one further elongate clamping structure (10´, 10´´, 10´´´) is oriented
parallel to the elongate rigid member (12) of the first mentioned elongate clamping structure
(10).
9. The transformer core according to claim 8, comprising at least three elongate clamping
structures (10, 10´, 10´´, 10´´´) such that a row of elongate clamping structures along the
column (6) is formed, comprising a first elongate clamping structure (10), a second elongate
clamping structure (10´), and a third elongate clamping structure (10´´), in that order, wherein
a first distance (d1) between the first and the second elongate clamping structures (10, 10´)
differs from a second distance (d2) between the second and the third elongate clamping
structures (10´, 10´´).
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10. The transformer core according to claim 9, wherein the row of elongate clamping
structures (10, 10´, 10´´, 10´´´) is formed such that the distances (d1, d2, d3) between the
elongate clamping structures (10, 10´, 10´´, 10´´´) increase with increasing distance form the
first yoke (2), wherein preferably, the first yoke (2) is a bottom yoke and the second yoke (4)
is an upper yoke.
11. A transformer core of any of the preceding claims, further comprising at least one
further column (6´), wherein a main axis (8´) of the at least one further column (6´) and the
main axis (8) of the first mentioned column (6) are positioned within a common plane, and
wherein the opening main axis (18) of the elongate opening (16) is further oriented normal to
said plane.
12. A transformer core of claim 11, wherein the at least one further column (6´) is
constructed analog to the first mentioned column (6).
13. A transformer, comprising a transformer core of any of the preceding claims, and a
winding wound around the column (6).