JPH09327165A - Support device for printed-circuit board in stepping motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a support device by which the mounting structure of a printed- circuit board with reference to an insulator is simplified by a method wherein a wedge- shaped protrusion is formed at the inner circumferential part of a flange at the root part of a magnetic pole and the board is supported by the wedge-shaped protrusion and by the edge of a flange at the tip part of the magnetic pole. SOLUTION: The terminal part of a stator coil 5 is housed temporarily inside a slender groove 9 at an insulator 3. Then, a printed-circuit board is fitted to, and mounted on, an opening part 11 at the insulator 3. In this case, when the printed-circuit board is pushed into the opening part 11 at the insulator 3, a flange at the root part of a magnetic pole is expanded owing to a wedge-shaped protrusion 10 which is formed in the inside of the flange at the root part of the magnetic pole in the insulator 3 while it is being curved to the outside by the edge of the printed-circuit board. As a result, the printed-circuit board is pushed to the inside from the wedge-shaped protrusion 10, and it is mounted and attached inside the opening part 11. Then, the terminal part of the stator coil 5 which is housed temporarily inside the slender groove 9 is moved to a lead-out groove 14 which is formed in the printed-circuit board, and it is connected to the lead-wire bonding part 13 of the printed-circuit board.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a printed circuit board supporting device for a stepping motor.

[0002]

2. Description of the Related Art A conventional printed circuit board supporting device for a stepping motor has a magnetic pole root portion in which a collar of a magnetic pole root portion of an insulator mounted on a magnetic pole portion of a stator core is made thicker than a brim of a magnetic pole tip portion to increase strength. An example in which the printed circuit board is supported on the end face of the brim, and the thickness of the brim of the magnetic pole root is made approximately the same as the thickness of the brim of the magnetic pole tip, and the lengths of both the brims are made the same, There is an example in which a printed circuit board is contacted and supported (actual flat plate 1-39104), but in the example in which the collar at the base of the magnetic pole is thickened, the outer diameter of the insulator becomes large, which hinders miniaturization. In addition, in any of the above-described embodiments, the printed circuit board is fixed with a pin or an adhesive, so that the work process for fixing with the pin or the adhesive takes time. It had.

[0003]

SUMMARY OF THE INVENTION The present invention relates to a printed circuit board supporting device for a stepping motor, and more particularly to downsizing the motor, simplifying the structure for mounting the printed circuit board on the insulator, and mounting the printed circuit board. It has a structure that allows quick and easy operation.

[0004]

According to the present invention, an insulator mounted on a stator core of a stepping motor is molded from a plastic material having insulation and elasticity, and a collar of a magnetic pole root of the insulator is formed from a collar of a magnetic pole tip. By providing a wedge-shaped protrusion that is long and has an inner peripheral portion near the end surface of the collar of the magnetic pole root portion that is inclined with respect to the end surface, the printed circuit board is pushed into the inner peripheral portion of the collar of the magnetic pole root portion of the insulator, It is characterized in that the protrusion is provided on the peripheral portion and the end face of the brim of the magnetic pole tip portion is used to simplify and downsize the supporting structure of the printed circuit board and facilitate the mounting work of the printed circuit board.

[0005]

According to the present invention, a stator core having a plurality of magnetic pole portions formed on the inner periphery thereof is provided with a two-divided insulator, and a stator coil is mounted on each portion of the insulator surrounding the plurality of magnetic pole portions. In a stepping motor in which a plurality of lead wires of a coil are connected to a printed circuit board and the printed circuit board is mounted in the opening of the insulator, the length of the collar at the root of the magnetic pole of the insulator is defined as the length of the collar at the tip of the magnetic pole. By providing a wedge-shaped projection on the inner peripheral portion of the collar at the base of the magnetic pole, and supporting the printed board by the wedge-shaped projection and the end surface of the collar at the tip of the magnetic pole. It is characterized by facilitating the attachment work to the opening and simplifying the structure for attachment.

[0006]

DETAILED DESCRIPTION OF THE INVENTION An apparatus according to an embodiment of the present invention will be described below with reference to FIGS. Stator core 1
A plurality of magnetic pole portions 2 are provided inside, and insulators 3 and 4 made of a non-conductive material having elasticity are bisected from both sides on the stator core 1 with the magnetic pole portions sandwiched therebetween. A stator coil 5 is mounted on a portion of the insulator surrounding the magnetic pole portion 2, and a lead wire 6 at one end of the stator coil is attached to the one insulator 3.
To the opening side (see FIG. 4).

The insulator is provided with a brim 7 at the base of the magnetic pole and a brim 8 at the tip of the magnetic pole, and the brim 7 at the base of the magnetic pole is longer than the brim at the tip of the magnetic pole. A narrow groove 9 for temporarily accommodating the lead wire 6 is provided substantially at the end face of the brim of the magnetic pole root portion, and a slanting wedge-shaped projection 10 is provided on the inner peripheral portion near the end face of the brim. A plurality of them are provided (see FIGS. 1 and 2).

A thin printed circuit board 12 is fitted on the inner peripheral portion of the opening 11 formed in the one insulator 3. (See FIGS. 1 and 2). The printed circuit board is provided with a lead wire connecting portion 13 at each portion corresponding to the narrow groove 9 in a state of being fitted in the opening 11 of the insulator 3 and a lead wire leading groove 14 at an end face thereof. Further, the printed circuit board 12 is provided with a connection socket 15 at a portion extending outward from the outer circumference of the stator core 1. The connection socket and the lead wire connection portion 13 are electrically connected. Since the device of one embodiment of the present invention has the above-described structure, it is assembled as follows.

That is, the insulators 3 and 4 divided into two parts are attached to the inner peripheral portion of the stator core 1 by abutting from both sides, and the stator coil 5 is wound around the outer peripheral portion of the magnetic pole portion of the stator core of the insulator. Then, the terminal portion 6 of the stator coil is temporarily stored in the narrow groove 9 of the insulator 3.

Next, the printed circuit board 12 is fitted into the opening 11 of the insulator 3. When the printed circuit board 12 is fitted onto the insulator 3, the printed circuit board 12
Is pushed into the opening 11 of the insulator 3 in the direction of the arrow B, the flange 7 of the magnetic pole root 7 is formed due to the wedge-shaped projection 10 provided inside the collar 7 of the magnetic pole root of the insulator 3.
Is expanded while curving outward by the end face of the printed circuit board 12 (see FIG. 5), the printed circuit board is placed inside the wedge-shaped projections 10 and easily mounted in the opening 3 to return to the original state. The returned wedge-shaped protrusions prevent the wedge-shaped protrusions from falling out.

The printed board 12 mounted on the insulator 3 is positioned and fixed in the insulator 3 by the wedge-shaped projection 10 provided on the collar 7 at the base of the magnetic pole and the end surface of the collar 8 at the tip of the magnetic pole (FIGS. 1 and 2). reference). Next, the terminal portion 6 of the stator coil 5 temporarily accommodated in the narrow groove 9 of the insulator 3 is moved into the lead-out groove 14 provided in the printed board 12 and is connected to the lead wire connection portion 13 of the printed board 12 by soldering. . Printed circuit board 12
When a connection socket 15 provided in the extension portion of the stator core 1 is connected to a power source and input, a magnetic force is output from the magnetic pole portion 2 of the stator core 1, so that a rotor (not shown) supported in the stator core 1 rotates. Be punished.

[0012]

[Effects] The present invention has the above-described structure and operation, and is capable of downsizing a motor, mounting a printed circuit board in an insulator opening quickly and easily, and having an extremely structure. Since it is simple, it has a great industrial effect that the production efficiency is remarkably improved.

[Brief description of drawings]

FIG. 1 is a front view of the present invention,

FIG. 2 is an enlarged sectional view of an essential part of the present invention,

FIG. 3 is an explanatory diagram of the internal structure of the present invention,

4 is a sectional view taken along line AA of FIG.

FIG. 5 is an enlarged state diagram of a main part of the present invention.

[Explanation of symbols]

 1 ... Stator core 2 ... Magnetic pole part 3, 4 ... Insulator 5 ... Stator coil 6 ... Lead wire 7 ... Collar at base of magnetic pole 8 ... Collar at tip of magnetic pole 10 ... Wedge-shaped protrusion 11 ... … Insulator opening 12 …… Printed circuit board

Claims (1)

[Claims] An insulator divided into two parts is attached to a stator core forming a plurality of magnetic pole portions on the inner peripheral portion, and a stator coil is wound around each portion of the insulator surrounding the plurality of magnetic pole portions, and a plurality of lead wires of the stator coil are provided. In a stepping motor which is connected to a printed circuit board and which is mounted in the opening of the insulator, the brim of the root of the magnetic pole of the insulator is made longer than the brim of the tip of the magnetic pole. A printed circuit board support device for a stepping motor, wherein a wedge-shaped projection is provided on an inner peripheral portion of a collar of a root portion of the base, and the printed circuit board is supported by the wedge-shaped projection and an end surface of the collar of a tip of the magnetic pole.