JPH11355996A - Holding structure of stator wiring board - Google Patents

Abstract

PROBLEM TO BE SOLVED: To stabilize holding structure and remarkably improve quality of a stator, in a holding structure of a stator wiring board constituted to hold a wiring board with a mold insulator formed on the end surface of a stator. SOLUTION: This holding structure has first struts 3 provided with pawl parts engaging with the surface side of a wiring board 7, and second struts 4 retaining the back side of the wiring board 7. These struts are arranged in a plurality of portions on the end surface of the stator. The first struts 3 and the second struts 4 change pitches in the radial direction, and notches 8 engaging with the first struts are formed in the wiring board 7. In response to necessity, a wall part 5 is formed in a mold insulator 2, and a plurality of leg parts 9 facing the wall part 5 are formed in the wiring board 7.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motor, and more particularly to a structure for holding a wiring board mounted on a stator coil end.

[0002]

2. Description of the Related Art The above-mentioned wiring board is frequently used mainly in small electric motors because it facilitates connection of coil terminals. Although various proposals have been made for the holding structure, a structure in which a fixed insulator is held using a molded insulator that forms the core insulation of the stator is generally used. An example of such a structure is described as a conventional example in Japanese Utility Model Publication No. 6-46199.

[0003] The conventional holding structure will be described with reference to the drawings. FIG. 3 shows a case of a stator in an outer rotor type electric motor. In the figure, reference numeral 3a denotes one of a plurality of columns integrally formed with a molded insulator forming a core insulation, and 7a denotes a donut shape. 2 shows a part of a wiring board made of a thin plate.

The pillar 3a has a slope 10a at the tip and an engagement groove 12 below the slope 10a.
Is provided with a notch 8a which engages with the engaging groove 12 of the support. The bottom of the notch 8a of the wiring board is guided by the slope 10a of the support and engages with the engagement groove 12, so that the wiring board 7a is held by the plurality of supports 3a.

[0005]

In the structure shown in FIG. 3, the depth of the notch 8a of the wiring board 7a is substantially the same as the depth of the bottom of the engaging groove 12 of the support 3a. When mounting the substrate 7a on the plurality of columns 3a,
The wiring board 7a is pressed downward, and is pushed down until the notch 8a is engaged with the engaging groove 12 along the slope 10a. As a result, the column 3a is elastically deformed inward with the pressing of the wiring board 7a, and the notch 8a is
2 to accept.

Since the base 11a of the column 3a is formed thick by the presence of the engagement groove 12, a large load is applied to the wiring board 7a when the plural columns 3a are simultaneously elastically deformed. As a result, there is a problem that the wiring substrate 7a is curved and the pattern on the substrate is easily disconnected. Also,
When a local load is concentrated on some of the columns 3a, there is a problem that the columns are cracked or the columns are broken beyond the elastic limit.

[0007]

SUMMARY OF THE INVENTION The present invention is directed to a stator wiring board holding structure configured to hold a wiring board by a molded insulator provided on an end face of the stator. A first support having a claw for locking;
And a second support for supporting the rear side surface of the wiring board, wherein both support are arranged at a plurality of positions on the end face of the stator.

Further, according to the present invention, the second support is arranged at a position in contact with the back of the stator coil, and the first support is arranged with a pitch in the radial direction of the stator relative to the second support. It is arranged so as to be shifted, and a notch is provided in a portion of the wiring board facing the first support to engage with the support.

The present invention further provides a cylindrical wall portion at an end of the molded insulator in a direction opposite to a claw direction of the first column, and the wiring board has a plurality of projections projecting toward the wall portion. Are provided.

[0010]

Since the support portion supporting the back side surface of the wiring board is separated, the first support can be formed thin and thin, and the elastic deformation of the first support when the wiring board is mounted on the first support. It will be easier. In addition, by contacting the second support with the stator coil, the pressing force from the coil is not applied to the first support, and the position of the wiring board that engages with the first support is determined by the cutout portion. It will be stable. Further, since the legs of the wiring board abut against the wall of the molded insulator, the movement of the wiring board is regulated, and the force applied to the first support is reduced.

[0011]

FIG. 1 is an exploded perspective view of a stator showing an embodiment of the present invention, and shows a stator of an outer rotor type electric motor. The holding structure of the present invention is not limited to this, and can be applied to an inner rotor type electric motor or another rotating electric machine employing the same holding structure without any problem.

In FIG. 1, reference numeral 1 denotes a stator core made of a laminated body of thin iron plates, which has an annular yoke portion inside and is radially outwardly formed from this yoke portion. Formed of a plurality of teeth. The periphery except the outer peripheral surface of the core 1 is covered with the molded insulator 2 to form the core insulation. For this, a thermoplastic molding resin such as polyethylene terephthalate or polybutylene terephthalate is used. A glass material is appropriately added according to the need for heat resistance. Generally, when the glass material is increased, the heat resistance is improved, but the elasticity of the molded insulator 2 is reduced to make it brittle. The molded insulator 2 is attached by a method such as molding by directly inserting the core 1 or fitting a pre-molded product into the core 1.

On the end face of the core 1, a plurality of first posts 3 having claws, and a plurality of second posts 4 are provided on both sides of the first posts 3 with a slight pitch inward in the radial direction from the first posts 3. These two pillars are formed integrally with the molded insulator 2. On the other hand, a cylindrical wall 5 is also formed integrally with the molded insulator 2 at the inner end of the core 1.

A coil 6 is wound around each tooth of the core 1 via a molded insulator 2. When the coil 6 is wound, the coil 6 tends to protrude in the radial direction.
No more protruding to be guarded by.

Reference numeral 7 denotes a wiring board made of a doughnut-shaped thin plate such as a glass epoxy material, on which a wiring pattern for connecting terminals of the coil 6 is provided. Lead lines are also connected on this pattern.

FIG. 2 shows details of the columns 3 and 4 in FIG. The first support 3 has a claw portion 10 at the tip,
The base 11 is formed to be thin and easily elastically deformed. The second support 4 is formed lower than the claw 10 of the first support 3 by the thickness of the wiring board 7. On the other hand, the wiring board 7 is provided with a notch 8 having a width capable of engaging with the first column 3, and the notch 8 is guided by the inclined surface of the claw portion 10 so that the wiring board 7 is pushed down during mounting. Thus, the notch 8 engages with the first column 3.

The depth of the notch 8 of the wiring board 7 is the first support 3
When the wiring board 7 is pressed downward, the first pillar 3 is elastically deformed inward to receive the wiring board 7 and the claw 10 is formed. The front surface of the wiring board 7 is locked by the operation. Wiring board 7
Is supported by contacting with the second support column 4. As a result, the wiring board 7 is clamped up and down by the first support column 3 and the second support columns 4 on both sides thereof, and the notch 8 Positioning in the circumferential direction is performed, and this engagement form is made at a plurality of locations over the entire circumference of the stator end face, so that the wiring board is firmly held.

Returning to FIG. 1, the wiring board 7 is provided with a plurality of legs 9 protruding inward. When the wiring board 7 is mounted on the columns 3 and 4, the legs 9 are formed by insulating. It is configured to abut the outer periphery of the cylindrical wall 5 of the body 2.
Due to the presence of such legs 9, the wiring board 7
Movement in the radial direction of the first support 3
Can be reduced.

[0019]

According to the present invention, since the portion supporting the back side surface of the wiring board is separated as the second support portion, the base portion of the first support can be formed thin and thin, and thus the base of the wiring board can be formed. Elastic deformation at the time of mounting becomes easy. Therefore, the load at the time of mounting the wiring board is reduced, and it is possible to prevent the wiring board from being bent and the pattern from being disconnected, and it is also possible to prevent the support pillar from being cracked or the support column from being broken, thereby improving the yield and quality of the stator. Can be greatly improved.

Further, since the second support guards the outer peripheral side of the stator coil, the first support does not hinder the inward elastic deformation when mounting the wiring board, and the mounting is more smoothly performed. In addition, since the first support does not receive the pressing force from the coil after the mounting, the position of the wiring board does not shift. This is to improve the strength quality of the first support, and to detect the rotational position of the rotor by fixing a position detecting element such as a Hall element to the wiring board. It greatly contributes to permanent maintenance.

In addition, when the legs provided on the wiring board abut against the walls provided on the molded insulator, the movement of the wiring board in the radial direction after the mounting is restricted. When any force is applied to the wiring board from the outside, the force applied to the support pillar can be reduced, and the movement of the wiring board is restricted to prevent displacement, and as a result, further quality is maintained. It is.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a stator showing an embodiment of the present invention.

FIG. 2 is an enlarged perspective view of a main part illustrating mounting of a wiring board according to the present invention.

FIG. 3 is an enlarged perspective view of a main part for explaining mounting of a conventional wiring board.

[Explanation of symbols]

 Reference Signs List 1 core 2 molded insulator 3 first support 4 second support 5 wall 6 coil 7 wiring board 8 cutout 9 leg 10 claw

Claims (3)

[Claims] 1. A device configured to hold a wiring board by a molded insulator provided on an end face of a stator,
A first support provided with a claw for locking the front surface of the wiring board; and a second support supporting the back surface of the wiring board. These two supports are provided at a plurality of positions on the end face of the stator. A stator wiring board holding structure, wherein the stator wiring board is arranged. 2. The method according to claim 1, wherein the second support is disposed at a position where the second support is in contact with a back portion of a stator coil, and the first support is disposed with a pitch shifted in a radial direction of the stator relative to the second support. 2. The holding structure for a stator wiring board according to claim 1, wherein a notch is provided at a portion of the wiring board facing the first support to engage with the support. 3. A plurality of legs protruding toward the wall on the wiring board, wherein a cylindrical wall is provided at an end of the molded insulator in a direction opposite to a claw direction of the first support. 3. The holding structure for a stator wiring board according to claim 1, wherein: