JPH01308005A - Method of connecting coil to circuit board - Google Patents

Abstract

PURPOSE:To facilitate assembly operation, and to decrease the number of the mandays of operation by mounting a pair of terminals having resiliency while being connected to a circuit pattern, holding a coil to the terminals and pressure-welding and electrically connecting the inner circumferential surface and outer circumferential surface of the coil to the terminals. CONSTITUTION:With coils 4A, 4B..., a sheet material composed of a conductive layer mainly comprising copper is coated with an insulating resin to a filmy shape and the sheet materials are laminated, the laminated sheet materials are wound and cut and an approximately triangular type coil is manufactured, and the conductive layer is exposed to an innermost circumferential surface and an outermost circumferential surface. The coils 4A, 4B... are arranged onto a stator substrate 1 with terminals 12, 14, and the exposed conductive layers of the coils are pushed into the terminals 12, 14. Since a gap (b) between the bent sections 12C, 14C of the terminals 12, 14 is set at a value narrower than the winding laminating width size (a) of the coil, the spring action of the bent sections 12C, 14 is generated and the bent sections 12C, 14c are pressure-welded to the innermost circumferential surface and outermost circumferential surface of the coil and brought to the state of holding, and the electric connection of the coil 4A and a circuit pattern can be maintained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industry to Which the Invention Pertains] The present invention relates to a method of connecting a motor coil to a circuit board.

[Prior art]

Coil technology for motors with rotor and stator facing each other in a plane (flat type), which is often used for VTRs, etc. i) A rice ball-shaped coil made by winding Cu wire in a rice ball shape.ii) A planarization of the motor was achieved. Sheet coil type iii using flexible printing In particular, there is a laminate type coil that was developed in recent years.

[Problem to be solved]

Each of the above coils has advantages and disadvantages, and among them, the upper laminated coil has many advantages such as a high space factor (high torque can be obtained) and a lower unit price of Co5t than sheets, coils, etc.

However, when used in audio equipment and video equipment, the film thickness of laminated coils is approximately 10 to 100μ, and while the space factor can be improved by laminating the windings, the film thickness is extremely thin, making it difficult to connect terminals to circuit boards. I had a problem with the connection that needed to be resolved. As a prior art, there is Japanese Patent Application Laid-Open No. 13305/1983 as a document disclosing the terminal connection of a laminated coil.

The technique according to the above-mentioned publication is such that a rod-shaped terminal portion extending in the thickness direction of the coil is integrally disposed on the outer circumferential surface and/or the inner circumferential surface of the coil.

According to the terminal connection shown in the above publication, the start and end of winding of the coil are made into rod-shaped terminals, and the contact area between the coil surface and the rod-shaped terminals is small (or there is a possibility that the contact area may become small or cause conduction failure). To prevent this, it is necessary to use a conductive adhesive.Also, it is necessary to use an adhesive on top of the conductive adhesive to reinforce it.

[Explanation of Examples]

1A and 1B are explanatory diagrams of the connection method according to the present invention;
Figures A and B are a partially cutaway perspective view and a sectional view of a main part of a motor using the connection method according to the present invention. In the figure, reference numeral 1 indicates a stator board of the motor, and reference numeral 2 indicates a rotor magnet.

The stator board l consists of a stator part la made of resin or metal and an insulating part 1b, and approximately rice ball-shaped coils 4A, 4B, etc. are placed on the insulating part 1b, and the coils 4
A, 4B, . . . are configured to be electrically connected to a circuit pattern (not shown) provided on the stator portion 1a.

The rotor magnet 2 has a bearing member 6 on the stator substrate l.
The coils 4A, 4B, . . . are disposed on a yoke member 10 which is fixed to a shaft 8 which is supported via a yoke member 10 so that its surface faces the coils 4A, 4B, . . . . In FIG. 1A, the surface of the stator board l has a circuit pattern IC-IC..., and the circuit pattern IC
・The land part ID-ID of the pattern of IC... has the first
As shown in Figure B, terminal 12. Attach 14.

The one terminal has a fixing part 12A that is soldered and fixed to the pattern land ID, and a rising part 12B rising from the fixing part 12A, and the rising part 12B has a substantially dogleg-shaped bent part 12c. It is preferable to make it from a phosphor bronze material in order to provide springiness to the rising portion.

The shape and material of the other terminal 14 are also the same as those of the terminal 12. In FIG. 1A, the land portion ID of the stator board l
- the terminals 12, 14 fixed to the ID are connected to each other at the bend 1;
2C-140 are facing each other, and the interval between the bent portions 12C-14C is the winding stack width dimension a of the coil 4A.
Make it narrower.

The stator board l has plate terminals 12, 14, etc. corresponding to the stator coils 4A, 4B, etc. shown in FIG. 2 A-B.
- is arranged on the stator board l at a position where the stator coil is placed.

Coils 4A and 4B are attached to the stator board configured as described above.
... is fixed, and the coils 4A, 4B...
・The sheet material of the conductive layer made of steel is coated with an insulating resin in the form of a film to form a laminated layer, which is wound and then cut to form a roughly rice ball-shaped coil, with the innermost circumference and the outermost circumference. The conductive layer is exposed on the surface.

The above coil 4804B... is connected to the terminal 12 as mentioned above.
14 and by pushing the exposed conductive layer of the coil between the terminals 12.14.
Terminal 12. By setting the interval between the bent portions 12C-14c of No. 14 to be narrower than the winding lamination width dimension a of the coil, a spring action of the bent portions 12C and 14c occurs, and the bent portion 12C-1
40 is in pressure contact with the innermost circumferential surface and the outermost circumferential surface of the coil, resulting in a sandwiched state, and the electrical connection between the coil 4A and the circuit pattern can be maintained.

In order to mechanically fix the coils 4A, 4B, etc., it is desirable to use an appropriate method such as bonding the surfaces of the coils that come into contact with the stator substrate with an adhesive or the like.

[Explanation of effects]

As described above, according to the present invention, a set of terminals is connected to a circuit pattern on a stator board in order to electrically connect a coil formed by laminating a conductive layer and an insulating layer into a shape such as a rice ball. The coil is sandwiched between the terminals to establish an electrical connection between the terminal and the conductive layer of the coil, and is a connection method suitable for the above-mentioned laminated coil, and does not require soldering or the like. Compared to the above method, manufacturing costs for motors and the like to which the present invention is applied can be reduced due to ease of assembly operations, reduction in work man-hours, and reduction in the number of parts.

[Brief explanation of the drawing]

FIGS. 1A and 1B are explanatory diagrams of a connection method according to the present invention. FIGS. 2A and 2B are a partially cutaway perspective view and a sectional view of a main part of a motor to which the present invention is applied. Mo? Figure 4 Figure 2B

Claims (1)

[Claims] (1) The conductive layer is exposed on the inner and outer circumferential surfaces of a coil formed by laminating a conductive layer and an insulating layer to form a substantially rice ball shape or a substantially cylindrical shape, and a circuit pattern is provided on a circuit board on which the coil is mounted. ,
A pair of terminals having a spring property are connected to the circuit pattern, the coil is sandwiched between the terminals, and the inner and outer circumferential surfaces of the coil are pressed against the terminals for electrical connection. How to connect the coil to the circuit board.