Inductor devices – With supporting and/or spacing means between coil and core – Preformed insulation between coil and core
Patent
1990-08-16
1992-08-18
Kozma, Thomas J.
Inductor devices
With supporting and/or spacing means between coil and core
Preformed insulation between coil and core
336212, 336233, H01F 2724, H01F 2730
Patent
active
051402912
ABSTRACT:
An inductive device comprises a soft magnetic core which consists of two E-shaped core halves (1), each of which comprises three parallel limbs (5, 7) which are interconnected by a yoke (9). The core halves (1) are arranged against one another by way of the free ends of the limbs (5, 7), a coil former (3) being provided around the central limbs (7). The outer limbs (5) extend between an upper boundary plane (25) and lower boundary plane (27), which planes extend parallel to the longitudinal directions of the limbs (5, 7) and the yokes (9), the distance between said planes being determined by the height (x) of the outer limbs (5) which is greater than the height (y) of the central limbs (7). The lower boundary of the central limb (7) is situated above or below the boundary plane (27) a distance such that the symmetry plane (31) of the central limbs (7) which extends parallel to the boundary planes (25, 27), is situated halfway between the upper boundary plane (25) and a plane (33) which extends parallel to the boundary planes and is from 0.1 to 1 mm above the lower boundary of the coil former (3). A winding (29) provided on the coil former (3) occupies exactly the space between the upper side of the outer limits (5) and the lower side, thus minimizing the height of the device. Such device may be, for example, a transformer or a choke coil.
REFERENCES:
patent: 4352081 (1982-09-01), Kijima
patent: 4424504 (1984-01-01), Mitsui et al.
patent: 4760366 (1988-07-01), Mitsui
Faase Paul N.
Mulder Stephanus A.
Tobben Johannes H.
Visser Eelco G.
Eason Leroy
Kozma Thomas J.
U.S. Philips Corporation
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