Abstract:
PURPOSE:To prevent a cut-through in case of the winding of an insulating tape and the deformation of the insulating layer in case of the molding of the insulating layer by changing tension on winding or properly adjusting the flexibility of the insulating tape and controlling the quantity of increase of the length of winding up to a proper value. CONSTITUTION:There is the insulating layer 2 around the conductor 1, and the insulating tape is wound in plural number. Difference between the circumferential length ln of the insulating tape of the outermost layer and the circumferential length lo of the surface of the conductor 1 is used as the quantity of increase of circumferential length DELTAl. Tension on the winding of the insulating tape is adjusted conformed to the flexibility of the insulating tape, or flexibility is adjusted through the adjustment of an ambient temperature or a solvent return while being conformed to tension on winding, the quantity of increase of the length of winding is controlled so as to obtain the quantity of increase of circumferential length DELTAl shown in formula, and the insulating tape is wound. When tension on winding is excessive, concentrated force applies at the corner sections of the conductor 1, and a cut-through phenomenon is generated; when the flexibility of the insulating tape is adjusted excessively or tension on winding is weakened excessively, the insulating layer 2 is deformed on molding, and insulation characteristics are often lowered remarkably.
Abstract:
A porous, electrical insulating adhesive substrate is made by (A) electrostatically coating a flexible sheet material with heat reactive adhesive resin particles, having an average particle size of between about 1 micron to 2,000 microns, the adhesive particles are applied in a predetermined pattern on the sheet covering from about 10 percent to 90 percent of the sheet material area, the area between the resin pattern not being patterned and then (B) heating the patterened coated sheet material between about 65 DEG C to 250 DEG C, forming a discontinuous, 0.25 mil to 25 mil (0.006 mm to 0.635 mm) thick, dry coating pattern of heat reactive adhesive particles bonded to the sheet material, said heat reactive adhesive coating covering from about 10 percent to 90 percent of the sheet material area; the patterned coated sheet may then be inserted as an oil permeable layer insulation between high voltage windings and low voltage windings and between layers of high and low voltage windings in a wound coil assembly, after which the assembly can be heated at a temperature and for a time effective to securely bond the winding layers together, and thus provide a porous, oil permeable, bonded transformer coil assembly.
Abstract:
PROBLEM TO BE SOLVED: To provide an electromagnetic pipe expanding inductor in which formation of voids during resin impregnation is suppressed, and electromagnetic reaction forces acting on a conductor circumference and on an interface between a shaft portion and a center-side fiber layer is diminished, and thereby durability is improved and the life of the inductor is prolonged. SOLUTION: A glass cloth tape (3) capable of being impregnated with resin is wound around the circumferential surface of the shaft portion of a bobbin (2) to a prescribed thickness, further, a conductor strand (4) coated with a glass cloth tape (6) is wound spirally in the axial direction of the bobbin (2) to form a coil. Further, a glass cloth (7) is wound around the outside of the glass cloth tape (6) to a prescribed thickness and thereafter the glass cloth tapes (3, 6) and the glass cloth (7) are impregnated with resin to unite them. A center-side resin-impregnated layer formed by the glass cloth tape 3 impregnated with resin is lower in the modulus of longitudinal elasticity than the shaft portion. Given that the inductor radius is (r), the thickness (t) of the center-side resin-impregnated layer is 0.025r to 0.25r. COPYRIGHT: (C)2011,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a wire rod for a coil which enables stable winding with increased space factor and can construct a coil of better performance than a round coil, and which can increase the productivity. SOLUTION: Arcuate chamfering portions are formed at four corners of a square cross section of the wire rod for a coil, having a square cross-sectional shape. The cross-sectional area of the wire rod for a coil formed with the chamfering portions is made 1.15 or more times as large as the area of a circle, having the same diameter as the length of one side of the square of the cross section of the wire rod. COPYRIGHT: (C)2005,JPO&NCIPI
Abstract:
PROBLEM TO BE SOLVED: To provide a high-density coil which increases space factor, improves efficiency, and is made compact. SOLUTION: The high-density coil is formed by winding a self-bonding insulation electric wire having an oval or hexagonal section without an air gap and it is provided with flux having a nearly honeycomb-like section. In addition, its manufacturing method is also provided. COPYRIGHT: (C)2004,JPO&NCIPI
Abstract:
PROBLEM TO BE SOLVED: To provide apparatus and a method for manufacturing a coil, in which uniform coating is formed during the insulating coating process of the coil to improve the reliability of products. SOLUTION: The apparatus includes a coil-winding core, and an adhesive feeder that applies adhesive to the lead wire reeled by the coil-winding core so that the coil turns are adhered to each together. The adhesive is applied entirely or partially to the lead wire for producing the coil to produce the coil. COPYRIGHT: (C)2004,JPO&NCIPI