JPH0449826A - Small-sized motor - Google Patents

Abstract

PURPOSE:To miniaturize the rotor shaft direction by integrally forming an engaging section housing a block body for a terminal to one of insulators at a position inner than an end face in the axial direction of the insulators at the position of a side section in the rotor shaft direction while engaging the block body for the terminal with the engaging section. CONSTITUTION:A stator core 7 is formed, and insulators 8a, 8b are fitted from both sides and insulated, thus forming a stator coil 9. The insulators 8a, 8b shape a pectinate engaging section fitted to teeth and slots formed inside the stator core 7, and the pectinate engaging section has an outer ring-shaped section 83a and inner ring-shaped sections 84a on one end side. An engaging section 85 is formed outside the outer ring-shaped section 83a of the insulator 8a, and a block body 11 for terminals and the terminals 10 are inserted. Extensions 9a from each winding end section are disposed among the outer ring-shaped section and the inner ring-shaped sections, and connected to the end sections of the terminals 10. The winding 9, the extensions 9a, connector sections and a housing are molded integrally with a resin and constituted.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a small electric motor, and more particularly to a small electric motor with an improved stator side structure when connecting a stator winding to a terminal.

[Prior Art] Conventionally, in small electric motors, a lead wire is connected to a connector connected to a power source, a drive circuit, etc., and the other end of this lead wire is connected to a winding inside the motor. For this reason, there are many connection points with the sword wire, etc., and poor contact or disconnection occurs at these connection points, leading to failure of the motor. Various techniques have been proposed in order to prevent connection failures and disconnections between the lead wires or between the lead wires and the windings inside the motor.

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

Also, JP-A-58-75455, JP-A-58-75
According to the techniques proposed in Japanese Patent Application Laid-open No. 456, Japanese Patent Application Laid-Open No. 58-75437, Japanese Patent Application Laid-Open No. 58-29363, and Japanese Patent Application Laid-open No. 58-29364, the terminals of each coil are wound around a coil bobbin. Protrude the terminal bin connected to it and place this terminal bin! It is disclosed that the device is connected through the substrate.

The small electric motor disclosed in the above-mentioned Japanese Patent Application Laid-Open No. 59-194658 is a PM type (permanent magnet type) stepping motor. This electric motor uses a multi-pole excited permanent magnet in the rotor, and the winding on the stator side is bifilar wound around a bobbin, and a connector is integrally formed on one bobbin, so that the two bobbins are overlapped. A joint is disclosed.

For this reason, in the small electric motor disclosed in Japanese Patent Application Laid-Open No. 59-194658, the connection between the connector and the end of the winding,
Since the winding ends of the two bobbins can be oriented in the same direction, direct connection with the connector can be easily made.

However, VR type (variable reluctance type) small electric motor, H
The winding structure of a stator used in a B-type (hybrid type) small electric motor is different from the structure of the PM-type stepping motor described above.

That is, when connecting each winding end to one connector, it is necessary to collect the winding ends coming out of each slot on the stator side in one place 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 separate, and a lead wire is used to connect them. In other words, in VR type and HB type small electric motors,
After forming the stator core, insulators that match the shape of the stator teeth are fitted from both sides of the stator to insulate the windings, which is different from the above PM type because the ends of each winding do not come out in the same direction. Different terminal fixings must be made.

In this way, in the PM type in which hollow cylindrical bobbins are used and the bobbins are stacked and joined, the ends of the windings come out at the same location, so it is possible to connect the ends of the windings directly to the terminals. In the case of the VR type and HB type, it is necessary to extend the inside of the motor housing using a rieet wire at the connector position at the end of the winding in each slot for connection. Directly apply the technology shown in the publication to HB
It cannot be used for small electric motors such as the 2000 and 2000 VR types.

On the other hand, the above-mentioned Japanese Patent Application Laid-Open No. 58-75455,
75456, JP 58-75437, JP 58-29363, JP 58-29364
In the technique proposed in the above publication, the end of the coil winding and the terminal of the connector are connected by a board to integrate the housing and the connector. Using a board in this way leads to an increase in the number of parts.

For this reason, as shown in Figure 9,
There is a proposed technology shown in the publication.

[Problems to be Solved by the Invention] As shown in FIG. 9, the proposed technology shown in the above-mentioned Japanese Utility Model Publication No. 64-2547 is such that the block-shaped protrusion 91 for the terminal protrudes from the upper part of the insulator 98a and is integrally molded. Therefore, a press-fitting space for the terminal 100 is required, and since this press-fitting space is located in the rotor axial direction, there is a limit to miniaturization of the motor in the rotor axial direction.

Further, since the terminal 100 is press-fitted into the block-shaped protrusion 91 formed on the upper part of the insulator 98a, the terminal position is located on the upper part of the insulator 98a. For this reason, each winding (stator coil)
99 and the terminal 100, the winding end 99a is connected by extending from the wound part toward the terminal 100, and the winding ends 99a do not contact each other. Not only is it necessary to do this, but there is also a small working space between the winding end 99a, the terminal 100, and the block-shaped protrusion 91 into which the terminal 100 is press-fitted, which poses a problem in workability, especially in small motors. In FIG. 9, reference numeral 93a is an outer annular portion, and reference numeral 94a is an inner annular portion.

The purpose of the present invention is to enable a connector and a housing to be integrated into a VR type and HB type small electric motor without increasing the number of parts, and to prevent connection failures and disconnections.
It is an object of the present invention to provide a compact electric motor that has a heat dissipation effect and can be downsized in the axial direction of the rotor.

Another object of the present invention is to provide a small electric motor in which the terminal and the end of the winding can be easily connected and workability is improved.

[Means for Solving the Problems] A small electric motor according to the present invention includes an insulator fitted from both sides of a stator core to form a winding, an extension end of the winding connected to a terminal, and the winding, A small electric motor in which an extension wire, a connector, and a housing of the electric motor are integrally formed of resin, wherein the insulator includes a comb-shaped engaging portion that fits into a slot formed inside a stator core, and the comb-shaped engaging portion. and an inner annular part formed inside the outer annular part at a position corresponding to the upper part of the teeth of the stator core, wherein the terminal is attached to a terminal block body,
One of the insulators is integrally formed with an engagement part that accommodates the terminal block body at a side position with respect to the rotor axial direction and an inner position from the axial end surface of the insulator, and the engagement part The terminal block body is engaged with the terminal block body.

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

Further, it is preferable that a guide groove corresponding to the number of terminals be formed on the end face of the outer annular portion on the engaging portion side of the insulator, in which the engaging portion for accommodating the terminal block body is integrally formed.

Furthermore, it is preferable that a locking portion is formed in the engaging portion, and a protrusion that is locked by the locking portion is formed in the terminal block body.

[Function] In the small electric motor according to the present invention, the terminal is attached to the terminal block body, and one of the insulators has the above-mentioned insulator at a side position with respect to the rotor axial direction, and at an inner position from the axial end face of the insulator. Since the engaging part for accommodating the terminal block body is integrally formed and the terminal block body is engaged with this engaging part, the terminal block body does not extend in the rotor axial direction. , there is no space for the terminal in the rotor axial direction,
The motor can be made smaller, that is, it can be made flatter. In addition, since the terminal block body is configured to engage with the engaging portion of the insulator, it is easy to insert the terminal into the terminal block body, and the terminal and the extension tip of the winding are connected easily. It is extremely easy to join.

At this time, if the engaging portion and the terminal block body are engaged by sliding, it is suitable for work efficiency.

Furthermore, if guide grooves corresponding to the number of terminals are formed on the end surface of the outer annular part on the engaging part side of the insulator in which the engaging part for accommodating the terminal block body is integrally formed, the extension line and the terminal At any connection point, each wire is neatly arranged and short circuits can be prevented.

Since the terminal block body is separate from the insulator before assembly, even if the terminal shape needs to be changed, this can be done by simply changing the terminal attachment portion of the terminal block body.

Further, if a locking portion is formed in the engaging portion and a protrusion is formed on the terminal block body to be locked by the locking portion, the terminal block body can be easily removed. This makes post-processing advantageous.

[Example code] Embodiments 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 and are not intended to limit the present invention.

1 to 8 show one embodiment of the present invention. In this example, an HB type stepping motor is used as an example of the small electric motor M, and as shown in FIG. 8, the small electric motor M has a rotor. 1, an output shaft 2 fixed to the rotor 1, ball bearings 3a, 3b of °C formed on both sides of the rotor 1, housings 4, 5, and an insulator 8 (8a, 8b). ) fitted into the stator core 7, a stator coil (winding) 9 wound in the slot 7b of the stator core 7, a terminal 10, and a terminal block body 11 holding the terminal 1.0.
It consists of a connector section 14 and the like.

The output shaft 2 in this example is a normal rotating shaft that is fixed to the rotor 1 and rotates, but like the output shaft of a linear output type electric motor, it is screwed to the rotor 1 and moves linearly forward or backward. It may be something.

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

The housing 5 is formed from the outside by molding synthetic resin, and during this molding, the ball bearing 3
A connector portion 14 for supplying power to the holding hole 13 and the stator coil 9 of b is integrally formed.

Also, when molding the housing 5, six terminals 1
0. Stator coil9. The extension line 9a is molded and fixed with synthetic resin and buried. Then, housing 4 and housing 5 are glued and caulked.

It is fixed with rivets etc.

Furthermore, the structure of the stator side portion, which is a characteristic part of the present invention, will be explained in detail based on FIGS. 1 to 6.

Figure 1 shows the stator core 7 and insulators 8 (8a, 8
b), which forms a stator core 7;
After that, insulator 8 (8a.

8b) are fitted from both sides of the stator core 7 (vertical direction in FIG. 1) to hold and insulate the stator core 7,
As shown in FIG. 8, a stator coil (winding) 9 is formed.

The insulators 8 (8a, 8b) are formed with comb-like engaging parts 80a, 80b that fit into the teeth 7a and slots 7b formed inside the stator core 7, and the comb-like engaging parts 80a, 80b are Outer annular portions 83a, 83 on one end side
b is formed, and inside these outer annular parts 83a and 83b,
Further, inner annular portions 84a and 84b are formed at locations corresponding to the inner soil portions of the teeth 7a of the stator core 7.

An engaging portion 85 is located outside the outer annular portion 83a of one insulator 8a, that is, at a side position (left position in FIGS. 2 and 3) with respect to the rotor axial direction (upper direction in FIG. 1). As shown in FIGS. 2 and 3, this engaging portion 85 extends from the end surface of the insulator 8a in the rotor axial direction to the side (in this example, approximately perpendicular to the rotor axial direction).
The guide grooves 87, 87 are formed at the end sides of the plate portions 86, 86 on both sides forming the U-shape. As shown in FIGS. 1 and 2, a protrusion 88 serving as a locking portion is formed in a part of the wall portion 87a forming the guide groove 87 (in this example, on the stator core 7 side).

Further, on the upper surface of the outer annular portion 83a on the engaging portion 85 side of the insulator 8a, guide grooves 89 corresponding to the number of terminals 10 are formed (in this example, the terminals 10
Since there are six 0's, six guide grooves 89 are formed).

As shown in FIGS. 4 to 6, the terminal block body 11 is made of a substantially rectangular plate, and has a plate on both sides.
Projections 11a and lla are formed so as to be able to engage with the guide groove 87 and slide. A through hole 81 for inserting the terminal 10 is formed at a predetermined location, and the projection 8 is formed on the insertion side of the terminal 10.
A protrusion 11b is formed so that the terminal block body 11 is not easily detached from the terminal block body 8.

FIG. 8 is a perspective view showing the windings 9 and the like on the stator side, and the extension lines 9a from the ends of each winding are the outer annular parts 83a, 8.
3b and the inner annular portions 84a, 84b, and is connected to the end (coil connection end) 10a of the terminal 10. At this time, the terminal 10 is inserted into the hole 81 formed in the terminal block body 11, but since the terminal block body 11 is not engaged with the engaging portion 85 of the insulator 8a, it 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. Connections are made by soldering, crimping, etc.

Next, the terminal block body 11 to which the terminal 10 is attached is slid into engagement with the engagement portion 85 of the insulator 8a. Then, the extension line 9a of the winding 9 is positioned in the guide groove 89 formed on the upper surface of the outer annular portion 83a.

After inserting the terminal 10 into the block body 11 in this way and connecting the end of the extension line 9a and the end 10a of the terminal 10, the block body 11 is slid into engagement with the engaging portion 85, and then a separate Mold with resin. and winding 9. Extension wire 9a, connector part 14 (Fig. 1) and housing 5
are integrally molded from resin as described above. Note that when the end portion 10a of the terminal 10 and the stator side are integrally molded with resin, the resin forms the outer annular portion 83a of the insulator 8.

Also filled between 83b and inner annular portions 84a and 84b,
The winding 9 and the extension wire 9a are fixed.

A rotor 1 is disposed in the housing 5 having the stator side parts thus formed, and the housing 4 is joined to form a small electric motor.

In this example, the number of terminals is 6, but it goes without saying that the required number can be formed depending on the number of poles of the stator, and when changing the number of terminals or changing the terminal shape or size, the terminal block can be used. Just by changing the body,
This can be done without changing other parts.

As another embodiment, in the above embodiment, the resin forming the housing 5 and the resin fixing the connecting portion between the terminal connection end 10a of the terminal 1° and the extension line 9a are individually molded. Although the housing 5 is constructed from two resins, it is also possible to form the housing 5 using the same material and simultaneously mold and fix them in a single molding process.

[Effects of the Invention] The present invention provides insulation by providing an insulator with an outer annular portion and an inner annular portion and fitting the insulator from both sides of the stator core. Since the engaging part that accommodates the block body for the terminal is integrally formed at the side position with respect to the rotor axial direction and at the inside position from the outer end surface of the insulator, the block body is located on the stator 1A side and is not located in the rotor axial direction, making it possible to reduce the size of the rotor in the axial direction, that is, to make it flat.

Further, according to the present invention, it is easy to insert the terminal into the terminal block body, and it is extremely easy to join the terminal and the extended tip of the winding. And on the upper surface of the outer annular part on the engaging part side of the insulator and -j regulator,
Since guide grooves corresponding to the number of terminals are formed, short circuits and the like can be prevented at the ends of the extension wire.

Furthermore, even if the terminal shape differs due to modification, this can be handled by simply changing the terminal block body.

Further, since the winding wire and the extension wire are fixed by the resin, not only can wire breakage and poor contact due to vibrations be prevented, but also the resin has a heat dissipation effect.

[Brief explanation of drawings]

1 to 8 show embodiments of the present invention,
Figure 1 is an exploded perspective view of the stator, Figure 2 is a top view of the insulator, Figure 3 is a side view taken from line ■-■ in Figure 2, and Figure 4 is the terminal attached to the block body. Figure 5 is a view from the stator core side in the state shown in Figure 4.
-A view seen from the X direction, Figure 6 is a view seen from the Y-Y direction of Figure 5, Figure 7 is a sectional view of the front main part of a small electric motor, and Figure 8 is a perspective view of the stator with windings etc. FIG. 9 is a perspective view of a conventional stator with windings and the like. 1...Low/Even, 2...Output shaft, 3(
3a. 3b)...bear link, 4.5...housing, 7...stator part,
8 (8a, Sb)... Insulator, 9... Winding wire, 9a... Extension line, 10... Terminal, 11... Block body, 8C) a, 80
b...Comb-shaped engagement part, 83a, 83b...Outer annular part, 84a, 84b...Inner annular part, 85...Engagement part, 1...Small electric motor. Fig. Fig. B Fig. Fig. Fig. 81 Fig.

Claims (4)

[Claims] 1. An insulator is fitted from both sides of the stator core to form a winding, an extension wire end of the winding is connected to a terminal, and the winding, extension wire, connector, and motor housing are integrally formed with resin. The insulator includes a comb-like engaging part that fits into a slot formed inside the stator core, an outer annular part that holds the comb-like engaging part, and a comb-like engaging part that fits into the stator core inside the outer annular part. an inner annular portion formed at a location corresponding to the upper part of the tooth, the terminal being attached to a terminal block body;
One of the insulators is integrally formed with an engagement part that accommodates the terminal block body at a side position with respect to the rotor axial direction and an inner position from the axial end surface of the insulator, and the engagement part A small electric motor, characterized in that the terminal block body is engaged with the terminal block body. 2. 2. The small electric motor according to claim 1, wherein the engaging portion and the terminal block are engaged by sliding. 3. Guide grooves corresponding to the number of terminals are formed on the end surface of the outer annular portion on the side of the engaging portion of the insulator in which the engaging portion for accommodating the terminal block body is integrally formed. A small electric motor according to claim 1 or 2. 4. 4. The terminal according to claim 1, wherein the engaging portion is formed with a locking portion, and the terminal block body is formed with a protrusion that is locked by the locking portion. small electric motor.