JPS58103840A - Coil for micromotor and method of producing coil for micromotor - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a nine-micro motor coil with an outer protective sheath and a method of manufacturing the same.

More particularly, the invention relates to the external protection of coils used in micromotors, in particular stepper motors commonly used in analogue electronic watches.

The structure of coils for micromotors is already well known and consists of an elongated, friend-shaped magnetic core, which is usually provided for connecting the stop DK core of the magnetic circuit of the motor stator. terminated by two lugs. On the core itself, windings of conducting wire are provided.The ends of the six windings usually have a cylindrical shape, and the two ends of 41 are led out to make the connection of the coils. The rounding 411 used to manufacture the coil is extremely fine, on the order of 0.02 to 0.03 rounds. Therefore, when installing the coil on the stator and installing it on the motor, the side faces of the coil may be damaged by the slightest shock or blow to the end face which would render the coil unusable, resulting in a short circuit. I end up.

This is also the reason why external protection of the coil is often provided, which serves merely as mechanical protection. One of the already known constructions is the cylindrical coil, in which the external protection is provided by tubes surrounding the sides of the coil. However, in this case, the end face of the coil is not protected and there is a risk of damaging the end face of the coil by improperly handling the jig provided for fixing the core of the coil on the stator stop, for example. There is.

In order to remedy these problems, it has been proposed to completely protect the coil by adding a cover plate to be interposed between the lug and the end face of the coil. This cover plate effectively protects one side of the coil. However, this technique has a major problem in that it requires a lot of auxiliary handling during the coil manufacturing process. Furthermore, since one of the ends of the conductor supplying the current to the coil is led out from the outer periphery of the coil, grooves should be provided in the K cover plate for the 4#s of this end of the coil, or other appropriate methods should be used. It is necessary to provide This makes handling the compost even more complicated.

The main object of the present invention is to solve the problems of the prior art and to provide an external protection that suitably protects the end faces of the coil as well.

According to the present invention, a coil for a micromotor is provided, which comprises a magnetic core in an elongated configuration, a substantially cylindrical winding, and a protective sheath. characterized in that the protective sheath consists of nine layers of integrally formed plastic material that extends over the entire cylindrical surface of the winding and also covers the periphery of both end faces of the winding. . Further, according to the present invention, in the above-mentioned method for manufacturing a coil for a micromotor, a sheath made of Coil Co., Ltd. heat shrinkable material is wound on the core, and the acid 7-s protrudes from both ends of the coil and is longer than the dimensions of the coil so that heating is not possible. After the sheath is contracted, both end faces of the coil are wrapped.

It is clear that the sheath protects not only the cylindrical surface of the coil, but also the end faces, in particular the circular edges of the end faces. The partial coating around the end face provides sufficient protection for the coil, especially against improper handling by hand during assembly of the coil.

The contracted sheath does not cover the central portion of the end face.

Preferably the heat shrink material is polyester and has a thickness of 2
．． 5 to 30 sn.

A heat-shrinkable material is used to create the protective envelope, which is self-adhesive on one side, and the envelope is created by wrapping a tape that is wider than the width of the coil.

An embodiment of the present invention will be described in detail below with reference to the drawings.

FIG. 1 shows nine coils with an elongated, round magnetic core 2, which terminates in lugs 4 and 6 which secure the core at the stops of the magnetic circuit of the stator. A winding 8 of a conductor is wound on the core itself, and its external shape is cylindrical with a cylindrical surface 8a and end surfaces 8b and 8c. A sheath IOK is provided on the winding 8 to protect the outside of the winding, and the sheath forms an integral protective sheath on the cylindrical surface of the winding 8 and the cylindrical portion 101, and protects the ends 8b and 8C of the winding. Both 1ilIifi parts 10b and 10C are provided to cover the periphery.

Preferably, the protective envelope 10 is a synthetic material or plastic.

made from recycled materials. The thickness of this material may be, for example, 15 to 20 mm thick, and typically 25 to 30 mm thick.

The outer wire maintenance sheath covers the cylindrical surface and the edges of the end face ld1, and particularly covers the circular edge 8d between the cylindrical surface 8a and both end faces 8b e 8c. Length & 25■, outer diameter 270■
In the case of a winding, the width e of the edge region as shown at 10b is of the order of 0.5 .mu. and more typically from 0.3 to 0.7 m.

This provides very good external mechanical protection of the windings. The above-mentioned maintenance is particularly important in the operation of installing the windings on the remainder of the stator, for example to protect the windings from improper movement of the assembly jig.

The occurrence of tangles that would render the windings unusable due to damage or crushing of the conductors is avoided.

A method for providing the external protection shown in FIG. 1 is described below. The coil is manufactured from a core 2 and a lug 4, which is provided, for example, by a printed circuit board 12 surrounding conductive tracks 12m and 12b. The coil is cylindrical in shape and surrounds a winding of length I. In order to supply the coil piezoelectric current, one end of the conductor 14 led from the outer periphery of the winding is connected to the first conductive path 12& of the printed circuit board 12, and the other end 16 is connected to the conductive path 12b. Ru.

In a first step, illustrated in FIG.
It is very long, and the inner pole of the sheath 10 is equal to the outer diameter of the winding 8. In other words, the sheath contacts the cylindrical surface 8a of the winding, while its end 10' extends beyond the winding 8.

There are several ways to manufacture enclosure 10. For example, use a heat-shrinkable material with a self-adhesive internal surface. A particularly suitable material is type 74 with the trademark "5COTCH", which is a 0.2 m thick polyester insulating tape. As shown in FIG. 3, the sheath is made by wrapping the tape strip around the windings so that one excess 10'a of the tape strip is overlapped and bonded to the other excess 10'b.

The inner diameter of the cylindrical sheath is thus equal to the outer diameter of the winding 8.

The second step is the heating of the coil assembly with the cylindrical sheath lO. This heating is performed, for example, in a heating chamber at 150°C for 2
This is done by heating for 5 to 3 seconds.

In this case, care must be taken that the core 2 should be electrically isolated from the winding 8. An advantageous method in this case is to cover the core with a self-adhesive insulating tape 20, preferably using the same material as the outer sheath. As shown in FIG. 3, the tape 20 surrounds the core and its ends 20 and 20b are overlapped with each other to ensure better insulation. As in FIG. 1, tape 20 projects beyond the end of roll 418.

According to the above explanation, the present invention can effectively solve the problem under favorable economical conditions. configured. However, this maintenance method uses a simple tool that fits the dentition. Due to its material properties due to the heating operation, the sheath is caused by a general contraction of the material. In the central part of the sheath that contacts the cylindrical surface of the winding, contraction is prevented; on the contrary, the contraction of the sheath that protrudes the winding is End 10'
As shown in FIG. 4, the material is contracted in such a way that the end portion 1G' wraps around the windings 8b and 8. This wrapping especially makes one corner of the winding 8d
Lead 1i14 derived from the outer periphery of winding 0-〇 where is maintained
It is important to note that this is done by slightly deforming the portion 1ON of the wrapping portion 10b. With this method, the end of the coil can be fixed without a special jig 4! Protected by gold.

In some cases, the coil is not provided with a printed circuit board.
In this case, the 1 m sections 14 and 16 of the conductor, in particular 14, are free ports. By any suitable means, move the ends s14 and 1 so that they are in the position shown by the second wAK.
Transform 6. If you stutter in this position, the above-mentioned external belly maintenance will be performed.

Various modifications of the invention will be apparent to those skilled in the art.
It is therefore intended that the scope of the invention be limited only by the claims that follow.

[Brief explanation of the drawing]

@ Figure 1 is a top view of a micromotor coil equipped with a protective sheath according to the present invention, Figure 2 is a sectional view taken along the 1- conductor line in Figure 1, and Figure 3 is a 1- line diagram in Figure 1. The sectional view taken along the line (2) and FIG. 4 are sectional views taken along IV--IV- in FIG. 1. (Explanation of symbols) 2... Magnetic core, 4.6... Lug, 8... Winding wire,
Qm...Cylindrical surface, 8b*8c...Side surface, 8d.
...Edge, lO...Sheath, 10-...Cylindrical part, 1
0 b eloG... @ surface part, lO'... protrusion part, 10"... conductor pull-out part, 10'a e 10'b・
...Overlapping portion, 12...Printed circuit board, 121ke
12b... Conductive path, 20... Core sheath, 20m1
．． 20b...Overlapping part, e...Side part width,!・
...Winding length 1/...Sheath length. Société Anonym Patent Attorney Akira Yoiki Patent Attorney Kazuyuki Nishidate Patent Attorney Mitsu Sugitsu Akira Yamaguchi

Claims (1)

[Claims] 1. A coil for a micromotor, the coil comprising:
An elongated, round magnetic core, a winding provided on the magnetic core and having a substantially cylindrical shape and having a side surface and both end surfaces, and an integral body that covers at least the periphery of the side surface and both end surfaces of the winding. A coil for a micromotor having an outer protection made of a formed layer of plastic material. 2. The coil according to claim 1, wherein the plastic material is made of heat-shrinkable polyester. A coil according to claim 1, wherein the cough layer is constituted by a tape surrounding the winding, one end of the tape being overlapped and adhered to the other end. 4. A coil according to claim 1, wherein the plastic material is provided on the magnetic core. (v) A method for manufacturing a coil for a micromotor, which includes the following steps: providing an elongated, round magnetic core; winding a conductive wire onto the magnetic core to form a generally cylindrical winding having a length I' around the winding that is greater than a length I of the winding; forming a substantially cylindrical envelope of heat-shrinkable material projecting from both ends of the winding, and heating the coil so as to contract the central protrusion of the collar envelope to enclose the periphery of the cough winding; A method for manufacturing a coil for a microphone simulator, comprising the steps of: & A method according to claim 6, wherein the material is polyester with a thickness between z5 and 31I1m. 7. The enclosure uses a cough material that is a tape with one side self-adhesive, and #4IIIt - one end of the tape of the material is overlapped and glued to the other shoulder. 5. The method according to claim 1g5, which is made by: & The method of claim 5, wherein said material is further electrically insulating and said magnetic core is coated with one layer of said material.