JPS6217461B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a stator for a small electric motor, and more particularly to a stator having an improved connection structure for connecting a lead wire of a stator coil to a terminal.

Conventionally, when connecting the lead wire of the stator coil to the terminal, the lead wire is soldered or welded to a terminal assembly in which the terminal is molded in advance with plastic. However, the prior art does not have a means for fixing the position of the terminal assembly relative to the stator when connecting the terminal assembly and the lead wire, and furthermore, the connection between the terminal and the lead wire is not provided. This is done by soldering etc.
Connection work between terminals and lead wires is inefficient.

In addition, when the applicant fixes the connection between the lead wire and the terminal near the coil end,
As shown in Fig. 1, the coil terminal 3 and connector terminal 4 drawn out from the coil end 1 of the stator coil attached to the stator core 2 are integrally molded together with the coil end using heat-resistant synthetic resin 5. (Japanese Patent Application Laid-open No. 50-10401, Japanese Patent Application Publication No. 50-10402). However, even if such a structure is adopted, the above-mentioned difficulties arise because the terminal 4 positioning means as described above is not provided. Also,
When performing integral molding, as can be understood from the illustrated structure, the mold for molding must be moved in the axial direction of the motor to set and release the mold, but the terminal 4 must be moved in the axial direction of the motor. Because of the protruding structure, there is a problem that the opening/closing stroke of the mold becomes long.

In view of the above-mentioned prior art, it is an object of the present invention to facilitate the connection work of the lead portion of the stator coil and contribute to its automation, and to provide a mold opening/closing stroke when integrally molding the terminal and the lead wire. An object of the present invention is to provide a stator for a small electric motor which is improved so that the molding device can be made smaller by shortening the stator.

In order to achieve this object, the present invention comprises a plate-shaped terminal plate made of an insulating material and having a slot having the same shape as the slot of the stator core, and a part of the outer circumferential surface of the terminal plate is provided with a slot on the stator core side in the axial direction. A terminal housing protruding from the terminal housing is provided, a plurality of terminal receiving chambers are formed in the housing and arranged in a direction perpendicular to the axis, the terminal plate and the stator core are brought into opposing contact with each other, and the terminal plate and the stator core are fitted into slots of the terminal plate and the stator core. A terminal electrically connected to the lead wire of the stored stator coil is fitted into the terminal accommodating chamber, and the stator core, terminal plate, and lead wire are integrally molded together with the stator coil using synthetic resin. . That is, the terminal plate is positioned at the end of the stator core by overlapping the end of the stator core and attaching the stator coil together with the stator core. This facilitates the connection work when connecting the motor and the terminal, and since the terminal is provided in the radial direction of the motor, the opening/closing stroke of the mold during integral molding can be shortened.

Next, a preferred embodiment of the present invention will be described with reference to FIG. 2 and subsequent drawings.

Figure 2 is a sectional view showing the overall structure of the electric motor;
The figure is an enlarged view of the main parts, and to explain the overall components from these figures, 1 is the coil end of the stator, 2 is the stator core, 3 is the lead wire of the stator coil, and 6, 7, and 8 are each. A terminal plate, a terminal cover, and a terminal are provided according to the present invention, and 9 is a synthetic resin in which the terminal plate 6, the terminal cover 7, and the lead wire 3 are integrally molded together with the stator.

Of the above components, the terminal board 6 will be explained first. This is made of synthetic resin and is insulating.
As generally shown in FIG. 4, it consists of an annular portion 6a that matches the stator core 2 and a terminal receiving housing 6b formed on a part of the outer periphery of the annular portion 6a. A slot 6c having a shape matching the slot of the stator core 2 is formed on the inner periphery of the stator core 2.

FIG. 5 is a plan view depicting a portion of the housing 6b, and FIG. 6 is a sectional view thereof. The housing 6b is formed with the same number of terminal accommodating chambers 6d as the number of terminals, each having a rectangular top opening. Slits 6f, 6f into which the ends of the lead wires are inserted from above to below are provided in the two wall portions 6e, 6e that face the motor axis to form the terminal accommodating chamber 6d. Furthermore, a lead wire end support stand 6g is erected at the center of the bottom surface of the terminal housing chamber 6d.

In addition, in FIG. 6, the wall surface portion 6e has a slit 6
It is shown divided into left and right parts by f, so in order to make it easier to read, each divided part is given a drawing reference number 6e, but it is not shown in this Figure 6. The wall portion 6e is a single component.

As shown in Fig. 7, the terminal cover 7 is made of a synthetic resin material in the shape of a long rectangular box, and the cover has elongated holes 7a for insertion of the same number of terminals as the number of terminals to be installed on the bottom surface. arranged in the longitudinal direction.

As shown in FIG. 8, the terminal 8 has a lower end bent into a rectangular shape to form a fitting part 8a to the terminal accommodating chamber 6d, and a bent part 8b at the lower end of the fitting is provided with the support base 6g. A hole 8c is made through which the wire can be passed, and slits 8f, 8f slightly narrower than the wire diameter of the lead wire 3 are formed in the parallel plate-like portions 8d, 8e forming the fitting portion, respectively. There is. Furthermore, sharp protrusions 8g, 8g are formed on the sides of the plate-like portions 8d, 8e for fixing the terminals by biting into the inner wall surface of the terminal accommodating chamber 6d. The plate-shaped contact portion 8h at the upper end of the terminal is connected to the elongated hole 7a of the cover 7.
It has the dimensions to fit into the cover 7 on both sides.
protrusions 8i, 8i are formed to engage with the bottom surface of.

Next, the process of fixing the lead wire in this electric motor will be explained. The slot insulator 10 shown in FIG. 10 is fitted into the slot 2a of the stator core 2 shown in FIG. It is installed so that it protrudes in the axial direction from both ends of 2. In this embodiment, the folded portion 10a described above is used to temporarily fix the terminal plate 6. That is, the slots 2a of the stator core 2 and the slots 6 of the terminal plate 6 (FIG. 4) are formed on the end surfaces of the stacked stator cores 2.
The terminal boards 6 are temporarily fixed to the stator core 2 by overlapping the terminal boards 6 so that the terminal boards 6 and 6 are aligned with each other, and by fitting the folded portions 10a of the insulating material into the slots 6c of the terminal boards. After that, the stator coil 1 is inserted into the slot 2a,
6c and press the terminal board with the coil end.

Thereafter, as shown in FIG. 11, the ends of the lead wires are inserted into the slits 6f, 6f formed in the housing 6b of the terminal plate 6 and held therebetween. Next, the fitting portion 8a of the terminal 8 is fitted into the terminal accommodating chamber 6d, and the slit 6f and the slit 8f are brought to face each other.

At this time, the lead wire 3 is connected to the support base 6g and the slit 6.
The terminal 8 and the core wire of the lead wire 3 are electrically connected by breaking the coating at a slit 8f having a width narrower than the wire diameter of the lead wire 3.

After fixing the terminal 8 in each terminal accommodating chamber 6d in this way, the elongated hole 7a of the cover 7 is inserted into the contact portion 8h of the terminal 8.
, and press the cover 7 until the bottom surface of the cover 7 touches the protrusion 8i of the terminal 8.

Next, as shown in FIG. 12, a mold 1 is formed with columnar parts 11a for forming the stator inner surface that match the inner diameter of the core 2 and recesses 11b that match the cover 7.
1 from one side of the stator so that the concave portion 11b fits into the cover 7, and from the other side, a mold 12 having a predetermined shape that wraps around the stator and the columnar portion 11a is set against the mold 11,
By injecting resin into the mold from the gate 13, the resin housing 9 is formed integrally with the stator. At this time, the cover 7, the terminal plate 6, and the lead wire 3 are simultaneously fixed by the resin housing.

When the terminals are fixed at the same time as the housing is formed in this way, the mold opening/closing stroke can be shortened by the dimension l compared to the conventional connector terminal 4 (indicated by a dotted line) that protrudes in the axial direction.

As described above, the present invention includes a terminal plate having a slot having the same shape as the stator core and forming a terminal accommodating chamber, and with the terminal plate temporarily fixed to the stator core, the lead wire is connected to the terminal. Since it is designed to be able to connect,
Compared to a device in which the position of the lead wire and terminal is not fixed during connection, the connection work between the terminal and the lead wire can be performed more easily and efficiently. In addition, since the terminal housing is formed in the radially extending portion of the terminal plate, the mold opening/closing stroke when molding the terminals together with the stator is shortened, resulting in miniaturization of the molding equipment and molding efficiency. is achieved.

As shown in the example, a structure is adopted in which the lead wire is set in the terminal accommodating chamber of the terminal board, and the covering of the lead wire is broken as soon as the terminal is placed in the terminal accommodating chamber, making electrical connection possible. For example, work such as soldering, which was conventionally required, is no longer necessary, work efficiency is further improved, and connection work can be easily automated.

Further, as shown in the embodiment, if the box-shaped cover 7 having the hole 7a that matches the terminal 8 is adopted, burrs will not be generated in the contact portion 8h of the terminal 8 during resin molding, and automation is easy. It is.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of a stator of a small electric motor showing a conventional opening structure, Fig. 2 is a sectional view of a stator of a small electric motor showing an embodiment of the present invention, and Fig. 3 is an enlarged view of the main part of Fig. 2. , FIG. 4 is a front view showing an example of the terminal board used in the present invention, FIG. 5 is a plan view showing a part of the terminal board, FIG. 6 is a cross-sectional view of FIG. FIG. 8 is a perspective view showing the terminal cover used in the example shown in FIG. 2, FIG. 9 is a partial perspective view showing the slot portion of the stator core, and FIG. FIG. 11 is a perspective view showing the set state of the lead wire in the embodiment;
FIG. 12 is a sectional view of a mold and a stator showing the state during molding of the example. 1...Coil end, 2...Stator core, 3
... Lead wire, 6 ... Terminal board, 6a ... Annular part,
6b...Terminal housing, 6c...Slot, 6
d...Terminal accommodation chamber, 6f...Slit, 6g...
Lead wire support stand, 7...Terminal cover, 7a...Terminal insertion hole, 8...Terminal, 8a...Fitting part, 8f
...Slit, 8g...Protrusion for biting, 8h...Contact part, 8i...Protrusion for locking terminal cover, 10...
Insulator in slot, 10a... folded part, 11,
12... Mold, 11b... Recess for accommodating a terminal cover, 13... Gate.

Claims (1)

[Claims] 1. A plate-shaped terminal plate having a slot having the same shape as the slot of the stator core is made of an insulating material, and a terminal protruding toward the stator core in the axial direction is provided on a part of the outer peripheral surface of the terminal plate. A stator coil is provided with a housing, a plurality of terminal accommodating chambers are arranged in the housing in a direction perpendicular to the axis, the terminal plate and the stator core are brought into opposing contact with each other, and the stator coil is housed in the slot of the terminal plate and the stator core. A stator for a small electric motor, wherein a terminal electrically connected to the lead wire is fitted into the terminal accommodating chamber, and the stator core, the terminal plate, and the lead wire are integrally molded together with the stator coil using a synthetic resin. 2. A box-shaped terminal cover is provided with a hole on the bottom surface that matches the contact part of the terminal, and the terminal cover is
2. A stator for a small electric motor according to claim 1, wherein at least a part of the stator is integrally molded with the terminal plate.