JPH02229408A - Coaxial rotary transformer - Google Patents

Abstract

PURPOSE:To enhance an assembly property of a coil by a method wherein cut-out grooves which are connected respectively to coil grooves from the upper end face and the lower end face of a core at the outer circumference side and which are parallel to a core-axis direction are formed and are shaped to be a taper by which an extraction direction of a coil lead wire forms an obtuse angle with reference to an outer circumference face. CONSTITUTION:Cut-out grooves 19, 20 are formed in a rotor core 16 at its upper-part end face; cut-out grooves 21, 22 are formed at its lower-part end face. The cut-out groove 19 is cut out up to a coil groove 31, the cut-out groove 20 is cut out up to a coil groove 32 in the same manner, the cut-out groove 21 is cut out up to a coil groove 33 and the cut-out groove 22 is cut out up to a coil groove 34 so as to house a coil. When the coil is inserted into the coil groove, it can be inserted along the cut-out groove in a state that a lead wire of the coil has been extracted in an outer-diameter direction of the core. Each coil is stopped by being supported by the cut-out groove in a position of each coil groove; it can be positioned easily as compared with a case where a coil is inserted into an inside groove of a core on the outer-diameter side. A core cut-out groove taper 35 is formed at an extraction groove; when a lead wire 30 is extracted, an outer-circumference contact part 36 of the core forms an obtuse angle; it is possible to prevent a disconnection caused due to the lead wire being bent.

Description

[Detailed description of the invention] a. Purpose of the Invention [Field of Industrial Application] The present invention relates to a new structure of a coaxial rotary transformer that facilitates the assembly of a coil of a coaxial rotary transformer used in a rotary magnetic recording device such as a VTR or R-DAT. .

[Conventional technology]

A conventional coaxial rotary transformer is composed of an inner stator core 1 and an outer rotor core 2, each having a ring-shaped cross section, as shown in Fig. 5, and the channels into which the coils are inserted correspond to the number of heads on the same axis. An arbitrary number can be attached. In this embodiment, a case of 4 channels is shown.

Conventionally, this type of rotary transformer has coils 3 to 6.
is inserted and fixed into the coil grooves 7 to 10 provided on the inner diameter of the core, and the lead wire from the coil is inserted into the lead wire extraction groove 11 provided on the inner diameter of the core to connect the coil and the magnetic head.
The core was pulled out along the core end face and connected to an external printed circuit board, etc. Therefore, in the conventional coaxial rotary transformer, when inserting the coil into the coil groove, it is difficult to fix and position each channel in the coil groove, and a dedicated positioning jig is required.

FIG. 6 shows a cross section of a lead wire extraction portion of a conventional coaxial rotary transformer. The lead wires 12 to 15 of the coils inserted into the coils @3 to 6 must be passed through the lead-out groove 11 on the outside of the coils so that they do not protrude beyond the surface A, which is the inner diameter surface of the core. First, it is necessary to insert the coils in the order of 3, 4, 5.6. If the coils are not inserted in the correct order, the leads may protrude from the core A side as shown in the figure MA14. Become.

From the above points, when assembling the coils of a conventional coaxial rotary transformer, the structure requires that the coils be inserted and fixed from one direction. There was a problem that it was bad.

[Problem to be solved by the invention]

In order to eliminate these problems, the present invention changes the structure of the core by attaching a cutout groove in the axial direction of the core to draw out the coil lead wire from the inside of the core. An overhang is provided on the wiring terminal board that corresponds to the notch groove, and an adhesive injection groove is installed between the core and the terminal board to facilitate resin bonding of the core and the terminal board. To provide a coaxial type rotary transformer having a structure in which the outer side is covered and fixed with a heat shrink tube after being attached to a terminal plate, and the coil can be easily assembled.

mouth. Structure of the Invention [Means for Solving the Problems] The coaxial rotary transformer according to the present invention has a coil groove for storing a coil of an outer diameter core constituting the transformer.
Attach cutout grooves from the upper and lower end surfaces of the core in the axial direction of the core, and insert each coil into each channel by pulling out the coil lead wire toward the outer diameter of the core. The lead wire is fixed between the core and the outer periphery of the terminal plate using a heat shrink tube that covers the terminal plate to which the core is attached and the core.

The lead wires of each channel are connected to the terminals attached to the standoffs on the board mounting side of the terminal board resin-bonded to the end face of the core, forming a coaxial rotary transformer.

[Effect]

To draw out the coil lead wire of the outer coil of the coaxial rotary transformer according to the present invention, grooves are cut into each coil groove from the upper and lower end surfaces of the core in parallel to the axial direction of the transformer core. The lead wire of the coil housed in the coil groove is passed through the cut groove and pulled out in the outer diameter direction of the core, and the lead wire is connected to the terminal of the terminal plate attached to the end surface of the core along the outer peripheral surface of the core. The cut groove at the lower end of the core to which the terminal board is attached has a protruding part corresponding to the height of the coil groove on the outer periphery of the core attachment of the terminal board, and the lead wire that passes through the outer surface of the core and connects to the terminal of the terminal board. , is fixed to the core together with the terminal plate by heat shrink tube.

Therefore, in conventional coaxial rotary transformers, a special jig was required to house the coil in the coil groove of the outer diameter core, and the coil lead wires coming out of the coil groove of each channel overlapped, resulting in In contrast, the coaxial rotary transformer according to the present invention is easy to assemble, does not cause overlapping of the coil lead wires, and is highly reliable and can be manufactured at low cost. I can do it.

〔Example〕

FIG. 1 is a perspective view of a completed coaxial rotary transformer according to the present invention from the installation side. FIG. 2 is a component configuration diagram of an embodiment of the coaxial rotary transformer according to the present invention, and FIG. 2(b) is a perspective view of the core of the coaxial rotary transformer according to the present invention. ．． 20 is provided on the upper end surface, and a notch groove 21.2 is provided on the upper end surface.
2 is provided on the bottom end face. The length of each notch groove is defined as the length up to the channel groove of each coil. That is, the cutout groove 19 is cut out to the coil groove 31 in FIG.
Similarly, the notch groove 20 extends to the coil groove 32, the notch groove 21 extends to the coil groove 33, and the notch groove 22 extends to the coil groove 3.
The coil is housed at a depth of up to 4, and the coil groove is cut out. By providing the notch groove according to the present invention in the core, when inserting the coil into the coil groove, the lead wire of the coil can be inserted along the notch groove while being pulled out in the outer radial direction of the core. Each coil is supported by a cutout groove and stops at each coil groove position, making positioning easier than in conventional coaxial transformers, where the coils are inserted into the inner groove of the outer diameter core.

FIG. 4 is a sectional view of the cutout groove. Core notch groove taper 35 is used for the groove from which the coil lead wire is pulled out.
When the lead wire 30 is pulled out, the outer peripheral contact portion 36 of the core becomes an obtuse angle, thereby preventing the lead wire from breaking at the bent portion.

Reference numeral 17 in FIG. 2(C) and FIG. 1 indicates a terminal board for wiring. The protruding portion 23 is located at the core notch groove 21 shown in FIG. 2(b), and the protruding portion 23 is structured to close the outer periphery of the core, leaving only the width of the coil groove. The protruding portion 24 corresponds to the notch groove 22 and has a similar structure. The core is fixed in a fixed position by a core positioning protrusion 27 shown in FIG. 1 provided on the inner diameter of the terminal plate 17 of the wiring and a recess 40 of the core. The lead wire 30 passes through the cutout groove 25 of the terminal plate along the outer circumferential side of the core and is wire-connected to a terminal 26 provided on the end face of the terminal plate. A lead wire guide protrusion 29 is provided close to the position of the pin terminal near the notch groove on the end surface of the terminal plate to prevent the lead wire from contacting the mounting surface and prevent the lead wire from sagging on the outer peripheral side of the lead wire core. are doing.

The adhesive injection groove on the inner diameter side of the terminal plate shown at 28 in FIG. Show effectiveness.

As shown in FIGS. 1 and 3, a heat-shrinkable tube 1
8, after assembling the core and the terminal plate, a heat shrink tube is inserted into the outer periphery of the core and the terminal plate and then heated and shrunk to bring the outer diameter side of the core and the side of the terminal plate into close contact and protect the lead wires.

The heat shrink tube prevents the lead wire from bulging and deforming in the outer diameter direction when the coaxial rotary transformer rotates at high speed, and also strengthens the fixation between the core and the terminal plate. The protective effect prevents the coil lead wire from breaking.

The embodiment of the present invention has been explained using an example of a structure in which the coil groove has four channels, but even if the number of coils, that is, the number of channels is increased, a coaxial rotary transformer can be constructed with the same structure as the embodiment of the present invention. Even if the outer circumference side transformer is a stator transformer, by adopting the structure of the present invention, it can be made into a coaxial type rotary transformer that is easy to assemble.

C. Effects of the Invention As described above, the coaxial rotary transformer according to the present invention has the advantages of easy assembly and high safety when assembling the coil of the rotor transformer, which is the outer transformer of the coaxial rotary transformer. It became possible to provide a coaxial type rotary transformer.

[Brief explanation of the drawing]

FIG. 1 is an assembled perspective view of a rotary transformer according to the present invention. FIG. 2 is a perspective view of the rotor transformer components of the coaxial rotary transformer according to the present invention. FIG. 3 is a sectional view of a rotary transformer according to the present invention. FIG. 4 is a partial sectional view of the cutout groove portion of the rotary transformer of the present invention. FIG. 5 is a sectional view of the core structure of a conventional coaxial rotary transformer. FIG. 6 is a sectional view of a rotor-transformer lead wire lead-out portion of a conventional rotary transformer. 1... Stator core, 2... Rotor core, 3,
4, 5, 6, 7, 8, 9, 10, 31,
32, 33. 34... Coil groove, 11... Lead wire extraction groove, 12, 13. 14. 15...
・Lead wire, 16... Rotor core, 17... Terminal plate, 18... Heat shrinkable tube, 19, 20, 2
1. 22... Notch groove, 23. 24... Protruding portion, 25... Notch groove of terminal board, 26... Terminal, 27... Core positioning protrusion, 28... Adhesive injection groove, 29... Lead wire guide protrusion , 30...Lead wire, 35...Core notch groove taber, 36...Contact point between notch groove and core outer periphery, 40...Recessed portion of core, Utility model registration applicant Tokin Co., Ltd. Figure 2 <-b) Figure 1 Figure 3 4

Claims (3)

[Claims] 1. A notch groove is provided parallel to the core axis direction that connects to each coil groove from the upper end face and lower end face of the outer peripheral core forming the coaxial rotary transformer, and the cross section of the notch groove is such that the direction in which the coil lead wire is pulled out is toward the outer peripheral surface of the core. A coaxial rotary transformer characterized by being formed into a tapered structure that forms an obtuse angle. 2. 2. The coaxial rotary transformer according to claim 1, wherein the terminal plate for fixing the core has a lead wire guide protruding structure that reaches the notch groove on the lower end surface of the core, and an adhesive injection groove is provided between the core and the terminal plate. A coaxial rotary transformer characterized by being configured to have. 3. In the coaxial rotary transformer according to claims 1 and 2, the coil is housed in the coil groove, and the terminal plate of the coil and the lead wire along the side surface of the core are covered with a heat shrink tube and fixed to the core and the terminal plate. A coaxial rotary transformer characterized by: