JP2883409B2 - Small electric motor - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a small electric motor, and more particularly to a small electric motor having an improved stator side structure when a stator winding is connected to a terminal.

2. Description of the Related Art Conventionally, in a small motor, a lead wire is connected to a connector connected to a power supply, a drive circuit, and the like, and the other end of the lead wire is connected to a winding inside the motor. For this reason, there are many connection points with a lead wire, etc.
A disconnection or the like occurred, causing a failure of the motor. Various techniques have been proposed in order to prevent such a lead wire or poor connection or disconnection between the lead wire and a winding inside the motor.

For example, in the technique proposed in Japanese Patent Application Laid-Open No. 59-194658, it has been proposed to integrally mold a motor body (stator) and a connector. According to this, it is disclosed that a stator-side component such as a stator coil, a stator core, a coil bobbin, and a terminal is formed of synthetic resin, and a connector and a motor housing are integrally formed.

JP-A-58-75455, JP-A-58-75456, JP-A-58-75437, JP-A-58-29363,
According to the proposed technique disclosed in Japanese Patent Application Laid-Open No. 58-29364, it is disclosed that terminal pins for connecting terminals of each coil are protruded from a coil bobbin around which a coil is wound, and the terminal pins are inserted and connected to a wiring board. Have been.

The small motor disclosed in the above-mentioned Japanese Patent Application Laid-Open No. 59-194658 is a PM type (permanent magnet type) stepping motor. In this motor, the rotor uses multi-pole excited permanent magnets, the stator winding is bifilar wound on the bobbin, and a connector is integrally formed on one bobbin so that the two bobbins overlap. A joined version is disclosed.
For this reason, in the small electric motor disclosed in JP-A-59-194658, the connection between the connector and the winding end portion allows the winding end portions of the two bobbins to come out in the same direction. It can be easily connected directly.

However, VR type (variable reluctance type) small motor, HB
The winding structure of the stator used in a small (hybrid) small motor or the like is different from the structure of the PM stepping motor.

In other words, when connecting each winding end to one connector, it is necessary to collect the winding ends protruding from each slot on the stator side at one location to form a connector. For this reason, the formation position of the connector and the position of the winding end are not in the same direction but are different, and lead wires are used to connect them. That is, in the case of a VR-type or HB-type small motor, after forming a stator core, insulators that match the shape of the stator teeth are fitted from both sides of the stator to insulate and form windings. Must not be fixed in the same direction as the above PM type.

As described above, in the PM type in which the bobbins are overlapped and joined using the hollow cylindrical bobbin, the winding ends can be directly connected to the terminal because the ends of the windings come to the same place. In the case of the HB type and HB type, it is necessary to connect the ends of the windings in each slot by extending the inside of the motor housing using a lead wire at the position of the connector.
The technique disclosed in Japanese Patent No. 194658 cannot be directly used for HB type and VR type small motors.

On the other hand, proposed technologies such as the above-mentioned JP-A-58-75455, JP-A-58-75456, JP-A-58-75437, JP-A-58-29363, JP-A-58-29364, etc. In this case, the end of the coil winding and the terminal of the connector are connected by a substrate, and the housing and the connector are integrated. Using a substrate in this manner leads to an increase in the number of components.

For this reason, as shown in FIG. 9, there is a proposed technique disclosed in Japanese Utility Model Laid-Open Publication No. 64-2547.

[Problem to be Solved by the Invention] According to the proposed technique disclosed in Japanese Utility Model Application Laid-Open No. 64-2547, as shown in FIG. 9, a block-like projection 91 for a terminal projects above the insulator 98a and is integrally formed. Therefore, the press-fitting space of the terminal 100 is required, and since this press-fitting space portion is in the rotor axial direction, the miniaturization of the motor in the rotor axial direction is limited. Further, since the terminal 100 is press-fitted into the block-like projection 91 formed on the insulator 98a, the terminal position is located on the insulator 98a. For this reason, in the connection between the end portion 99a of each winding (stator coil) 99 and the terminal 100, the winding end portion 99a extends from the wound portion toward the terminal 100 and is connected. It is necessary not only that each winding end 99a does not touch, but also that the winding end 99a and the terminal 100
And the working space between the block-shaped projection 91 for press-fitting the terminal 100 is small, and there is a problem in workability especially in a small motor. Note that reference numeral 93a in FIG.
Reference numeral 94a is an inner annular portion.

An object of the present invention is to provide a VR type, HB type small motor,
Provided is a small electric motor that can integrate a connector and a housing without increasing the number of parts, prevent poor connection and disconnection, have a heat radiation effect, and can be downsized in the rotor axial direction. It is in.

Another object of the present invention is to provide a small-sized electric motor in which connection between a terminal and a winding end is easy and workability is improved.

[Means for Solving the Problems] In a small electric motor according to the present invention, an insulator is fitted from both sides of a stator core to form a winding, and an extension end of the winding is connected to a terminal. What is claimed is: 1. A small-sized motor in which an extension line, a connector, and a housing of an electric motor are integrally formed by a resin, wherein the insulator has a comb-shaped engaging portion fitted to a slot formed inside a stator core, and the comb-shaped engaging portion. And an inner annular portion formed at a position corresponding to the upper part of the teeth of the stator core inside the outer annular portion, wherein the terminal is attached to a terminal block body, One of the insulators engages with the terminal block at a position lateral to the rotor axial direction and at an inner position from an axial end face of the insulator. There is a configuration in which engaged with, said terminal block body engagement portion are integrally formed.

Further, it is preferable that the engaging portion and the terminal block are engaged by sliding.

Further, it is preferable to form guide grooves corresponding to the number of the terminals on the end surface of the outer annular portion on the engaging portion side of the insulator integrally formed with the engaging portion accommodating the terminal block.

Further, it is preferable that a locking portion is formed on the engagement portion, and a projection locked by the locking portion is formed on the terminal block body.

[Operation] In the small electric motor according to the present invention, the terminal is attached to the terminal block, and one of the insulators includes:
An engaging portion for accommodating the terminal block body is formed integrally with the insulator at an inner position from an axial end face of the insulator at a side position with respect to the rotor axial direction, and the terminal block body is formed at the engaging portion. Are engaged, the terminal block does not extend in the rotor axis direction, and there is no space for the terminal in the rotor axis direction, and the motor can be reduced in size, that is, flattened.
In addition, since the terminal block is configured to engage with the engaging portion of the insulator, it is easy to insert the terminal into the terminal block, and the terminal and the extension end portion of the winding are connected to each other. Very easy to join.

At this time, when the engagement portion and the terminal block body are engaged with each other by sliding, it is efficient in terms of work efficiency.

Further, when guide grooves corresponding to the number of the terminals are formed on the end surface of the outer annular portion on the engagement portion side of the insulator integrally formed with the engagement portion accommodating the terminal block body, the extension line and the terminal are formed. At the connection with
Each wire becomes orderly, and a short circuit or the like can be prevented.

Since the terminal block is separate from the insulator before assembly, even if the terminal shape is changed, it can be dealt with only by changing the terminal mounting portion of the terminal block.

Further, when the engaging portion is formed with a locking portion and the terminal block body is formed with a projection locked by the locking portion, the terminal block body can be easily detached. Therefore, the subsequent steps can be advantageously performed.

Example An example of the present invention will be described below with reference to the drawings. However, as a matter of course, the components and other members and arrangements described or illustrated in the following description are merely illustrative examples rather than limiting the present invention.

1 to 8 show an embodiment of the present invention. In this embodiment, an HB type stepping motor is used as an example of the small motor M, and as shown in FIG.
A rotor 1, an output shaft 2 fixed to the rotor 1,
Ball bearings 3a, 3b as bearings formed on both sides of the rotor 1, housings 4, 5, a stator core 7 in which insulators 8 (8a, 8b) are fitted, and winding around slots 7b of the stator core 7 The terminal 10 includes a stator coil (winding) 9, a terminal 10, a terminal block 11 for holding the terminal 10, a connector 14, and the like.

The output shaft 2 of the present embodiment is a normal rotating shaft fixed to the rotor 1 and rotated, but like the output shaft in a linear output type electric motor, is screwed to the rotor 1 and linearly advances or retracts. It may be something.

The ball bearings 3a and 3b hold both ends of the rotor 1 in housings 4 and 5 of the electric motor so that they can rotate freely.

The housing 5 is formed from the outside thereof by molding with a synthetic resin.
A holding hole 13b, a connector portion 14 for supplying power to the stator coil 9, and the like are integrally formed.

When molding the housing 5, six terminals are used.
10, the stator coil 9, and the extension line 9a are molded and fixed by a synthetic resin and buried. The housing 4 and the housing 5 are fixed by bonding, caulking, rivets or the like.

Further, the configuration of the stator side portion, which is a characteristic portion of the present invention, will be described in detail with reference to FIGS.

FIG. 1 shows the stator core 7 and the insulator 8 (8a, 8
b) is an exploded perspective view of FIG. 2B. After the stator core 7 is formed, the insulators 8 (8a, 8b) are fitted from both sides of the stator core 7 (vertical direction in FIG.
And is insulated to form a stator coil (winding) 9 as shown in FIG.

Insulator 8 (8a, 8b) is a comb-shaped engaging portion that fits into teeth 7a and slots 7b formed inside stator core 7.
80a and 80b are formed, and the comb-shaped engaging portions 80a and 80b are
Outer annular portions 83a and 83b are formed on one end side.
Inner annular portions 84a and 84b are formed inside the a and 83b and at a position corresponding to the upper inside of the teeth 7a of the stator core 7.

An engaging portion 85 is provided outside the outer annular portion 83a of one of the insulators 8a, that is, at a side position (left position in FIGS. 2 and 3) with respect to the rotor axial direction (vertical direction in FIG. 1). As shown in FIGS. 2 and 3, the engaging portion 85 is formed laterally from the end face of the insulator 8a in the rotor axis direction (in this example, substantially perpendicular to the rotor axis direction). It protrudes and has a U-shape opened in the rotor axial direction, and guide grooves 87, 87 are formed on the end sides of the plate portions 86, 86 on both sides forming the U-shape. Part of the wall portion 87a forming the guide groove 87 (in this example, on the side of the stator core 7),
As shown in FIGS. 1 and 2, a projection 88 is formed as a locking portion.

Also, an outer annular portion of the insulator 8a on the engagement portion 85 side.
Guide grooves 89 corresponding to the number of the terminals 10 are formed on the upper surface of 83a (in the present example, there are six terminals 10, so six guide grooves 89 are formed).

As shown in FIGS. 4 to 6, the terminal block 11 is formed of a plate having a substantially rectangular shape.
Protrusions 11a, 11a are formed so as to engage with the guide grooves 87 and slide. Then, a through hole 81 for inserting the terminal 10 is formed at a predetermined position, and the insertion side of the terminal 10 is locked by the protrusion 88 so that the terminal block body 11 does not easily come off. The projection 11b is formed.

FIG. 8 is a perspective view in which the windings 9 and the like are provided on the stator side, and an extension 9a from each winding end is disposed between the outer annular portions 83a and 83b and the inner annular portions 84a and 84b. To the end (coil connection end) 10a of the terminal 10. At this time, the terminal 10 has a hole 81 formed in the terminal block 11.
However, since the terminal block 11 is not engaged with the engaging portion 85 of the insulator 8a, the terminal block 11 can be easily attached. Then, the end of the extension 9a of the winding 9 and the end 10a of the terminal 10 are connected. The connection is made by soldering or crimping. Next, the terminal block 11 to which the terminal 10 is attached is attached to the engaging portion 85 of the insulator 8a.
To engage. And an extension of winding 9
9a is positioned in a guide groove 89 formed on the upper surface of the outer annular portion 83a.

After the terminal 10 is inserted into the block 11 and the end of the extension line 9a is connected to the end 10a of the terminal 10, the block 11 is slid into engagement with the engagement portion 85, and the connector
Form 14. Next, it is separately molded with resin. Then, the winding 9, the extension line 9a, the connector portion 14 (FIG. 8) and the housing 5 are integrally formed of resin as described above. When the end 10a of the terminal 10 and the stator side are integrally molded with the resin, the resin is formed into outer annular portions 83a and 83b and inner annular portions 84a and 84b of the insulator 8.
The space between them is also filled, thereby fixing the winding 9 and the extension line 9a.

The rotor 1 is disposed on the housing 5 having the stator-side components formed in this manner, and the housing 4 is joined to form a small electric motor.

In this example, the number of terminals is six. However, it is needless to say that the required number can be formed in accordance with the number of poles of the stator. It is possible to respond only by changing the body without changing other parts.

Further, as another embodiment, in the above embodiment, the resin forming the housing 5 and the resin fixing the connection portion between the connection end portion 10a of the terminal 10 and the extension line 9a of the terminal 10 are individually molded to form a housing. Although the housing 5 is formed, it is also possible to form and identify the housing 5 at the same time as forming the housing 5 using two resins as the same material.

[Effects of the Invention] The present invention can provide insulation by providing an outer annular portion and an inner annular portion on an insulator and fitting the insulator from both sides of the stator core, and extending between the outer annular portion and the inner annular portion. A line can be arranged, and at the side position with respect to the rotor axial direction, an engaging portion for accommodating the block body for the terminal is formed integrally with the insulator from the outer end face to the inner position. Are located on the stator core side and are not located in the rotor axis direction, so that downsizing, that is, flattening in the rotor axis direction can be achieved.

Further, according to the present invention, it is easy to insert the terminal into the terminal block body, and it is very easy to join the terminal to the extension tip of the winding. Since guide grooves corresponding to the number of the terminals are formed on the upper surface of the outer annular portion on the engaging portion side of the insulator, a short circuit or the like can be prevented at the end of the extension line.

Further, even when the terminal shape is changed by the change, it is possible to cope with the change only by changing the terminal block body.

In addition, since the winding and extension are fixed by the resin,
In addition to preventing disconnection and poor contact due to vibration, the resin has a heat radiation effect.

[Brief description of the drawings]

1 to 8 show an embodiment of the present invention.
FIG. 1 is an exploded perspective view of a stator portion, FIG. 2 is a top view of an insulator, FIG. 3 is a side view taken along the line III-III of FIG. 2, and FIG. FIG. 5 is a view from the XX direction of FIG. 4, FIG. 6 is a view from the YY direction of FIG. 5, and FIG. 7 is a small motor. Sectional view of main part of front, 8th
FIG. 9 is a perspective view of a conventional stator with windings and the like, and FIG. 9 is a perspective view of a conventional stator with windings and the like. 1 ... rotor, 2 ... output shaft, 3 (3a, 3b) ... bearing,
4, 5 ... housing, 7 ... stator core, 8 (8a, 8b) ... insulator, 9 ... winding, 9a ... extension, 10 ... terminal, 11 ... block body, 80a, 80b ... comb-shaped engaging part, 83a, 83b…
Outer annular portion, 84a, 84b: inner annular portion, 85: engaging portion, M: small electric motor.

Claims (4)

(57) [Claims] A winding is formed by fitting an insulator from both sides of a stator core, an end of an extension of the winding is connected to a terminal, and the winding, the extension, the connector and the housing of the motor are made of resin. A small electric motor integrally formed, wherein the insulator is a comb-shaped engaging portion that fits into a slot formed inside a stator core, an outer annular portion that holds the comb-shaped engaging portion, and the outer annular portion. An inner annular portion formed at a position corresponding to the upper part of the teeth of the stator core inside the terminal, wherein the terminal is attached to a terminal block body,
One of the insulators is integrally formed with an engaging portion for accommodating the terminal block at an inner side position from an axial end surface of the insulator at a side position with respect to the rotor axial direction. A small electric motor characterized in that the terminal block is engaged with a portion. 2. The terminal according to claim 2, wherein the engaging portion and the terminal block body include:
The small electric motor according to claim 1, wherein the small electric motor is engaged by a slide. 3. An end face of an outer annular portion on an engaging portion side of an insulator integrally formed with an engaging portion for accommodating the terminal block body has guide grooves corresponding to the number of the terminals. 3. The small electric motor according to claim 1, wherein: 4. The terminal according to claim 1, wherein a locking portion is formed on the engaging portion, and a projection locked by the locking portion is formed on the terminal block. The small electric motor according to any one of 1 to 3.