Process and design for producing inside coils

Details Process and design for producing inside coils Process and design for producing inside coils

1996-03-04

1998-02-10

Bray, W. Donald

Metal working

Method of mechanical manufacture

Electrical device making

29596, 29598, H01F 4106

Patent

active

057155917

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

The invention concerns a method and a configuration for the production of inside coils with a single layer inner winding in an inner groove of a ring-shaped body having a groove for the input and output of a winding wire.
The utilization of rotating head wheels having one or more heads in video recorders or recorders for digital recording and playback of signals to or from a magnetic tape is known in the art. The signals are recorded onto the magnetic band in diagonal tracks. Conventional induction regulators are utilized in order to facilitate transfer of the signals between a head wheel and the stationary part of a head drum. These induction regulators are usually constructed in a manner corresponding to the representation of FIG. 4. The induction regulators comprise a stationary part 40 which is associated with the stationary head drum, and a component 41 associated and rotating with the head wheel about the axis 44. Each component is provided with a winding 42, 43. A head drum configuration must have as many transformers as there are heads on the head wheel.
The use of such transformers is, for example, known in the art from DE 38 10 037 A1. The transformers utilized therein comprise inner and outer ferrite cores, each having a winding. Signal transfer takes place radially between a ferrite ring or rings in the outer stationary part and a ferrite ring or rings located in the inner rotating part.
The volume of the transformers necessarily decreases with the miniaturization of head drum units as well as with the increase in the frequencies to be transferred and/or with increasing numbers of transformers, as is in particular the case with digital recorders. This means that the requirements on precision which are demanded of the transformers constantly increase. This effects, on the one hand, the ferrite rings themselves, for example, the gap between the outer and inner ring and, on the other hand, the windings. The windings, which are made from a very thin wire, (for example of the order of magnitude of 0.15 mm in diameter) must be very precisely wound in a very confined region. Auxiliary means are sometimes utilized in order to assist in accommodating as precisely a defined winding as possible within a ferrite core.
An induction regulator for a recorder which utilizes a radially acting transformer is known in the art from DE 38 31 721 A1. A plastic body having grooves which is easily produced and which guarantees a high winding precision is utilized thereby to precisely guide the wire windings.
The use of such an auxiliary means is, however, relatively expensive and the handling of such a small plastic ring is difficult. In addition, particular problems are associated with the production of inner windings 42 needed for the stationary part 40 of the transformer.
A device for winding an inner transformer coil is described in the not previously published document DE 43 00 756 C2. An inner coil is produced in the inner groove of a ferrite ring using a winding spindle having a diagonal longitudinal bore for guiding the winding wire. The ferrite core or the winding spindle is rotated and displaced in the axial direction depending on the diameter of the winding wire. In this fashion, precise inner windings are produced. The winding spindle remains in the ferrite core after production of the inner winding so that the inner winding maintains its exact position during the securing of the inner winding in the ferrite core. The ferrite core is heated to bake a bonding layer which had been introduced onto the winding wire. The winding spindle is removed following a sufficient cooling period and is available for use in additional inner coil production.
The conventional device for winding an inner coil has the disadvantage that the winding spindle cannot be utilized during the time duration of the setting procedure of the inner coil in the ferrite core. In addition, heating can cause winding wire fed through the winding spindle to firmly bond inside the winding spindle or the bonding layer

REFERENCES:
patent: 4023262 (1977-05-01), Miknaitis
patent: 4882833 (1989-11-01), Hiramatsu et al.

Affiliated with

Also associated with

Rating

Process and design for producing inside coils does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Process and design for producing inside coils, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Process and design for producing inside coils will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2068476