JPH022044Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a stator for a small motor with an improved coil holder.

In the stator of a conventionally well-known small motor, the coils wound around the magnetic poles of the stator core are held in a shape that does not inhibit the insertion and removal of the rotor by means of a coil holder, and the stator core 1 as shown in FIG.
Insulating sheets 4, 4 made of, for example, polyester film are inserted between the stator core 1 and the coil 2, and both ends of the insulating sheets 4, 4 are made to protrude from the end surface of the stator core. There are some that are designed to provide reliable insulation.

However, if the insulating sheet 4 is flexible,
During coiling, external pressure acts on the sheet 4 due to the rigidity of the coil 2, and in particular, the external pressure acts strongly on the portions that protrude from the stator core 1, causing the sheet 4 to be easily bent and eventually damaged. I had a problem with something to do. On the other hand, in order to prevent the insulation sheet 4 from bending,
If a hard sheet 4 is used, the insulation coating of the coil 2 may be peeled off at both ends of the insulation sheet 4, or
The coil 2 would be bent strongly, and there was a risk that the coil 2 would be damaged.

This invention was made in consideration of the above-mentioned circumstances, and aims to provide a stator for a small motor that can prevent damage to the insulating sheet and coil.

That is, as shown in FIGS. 2 to 5 as an embodiment, the stator of this invention includes a stator core 11, a coil 13 wound around the magnetic pole 12 of the stator core 11, and a coil attached to the stator core 11. The coil holder 14 holds the coil 13 in a fixed shape, and the insulation sheets 15 and 16 are inserted between the stator core 11 and the coil 13 and have both ends protruding from the end surface 11a of the stator core 11. .

The stator core 11 is made up of a large number of thin steel plates stacked one on top of the other, and these thin steel plates are integrated by a pair of coil holders 14. This stator core 11 has grooves 12a for coil winding formed on both sides of the magnetic poles 12.

Each coil holder 14 includes a connecting portion 19 connected to the stator core 11, and a connecting portion 19 connected to the stator core 11.
A supporting portion 16 extends from both ends of the stator core 11 and is placed on the end surface 11a of the stator core 11, and a connecting portion 19 extends from both ends of the coil 12, respectively.
As shown in FIG. 4, it has a coil holding part 18 that is sandwiched between the support part 16 and the coil holding part 18 .

As shown in FIG. 4, the support portion 16 has a height B that is larger than the protrusion height A of the insulating sheet 15 from the end surface 11a. Furthermore, this support part 1
6 is formed by providing sheet contact concave surfaces 20, 20 corresponding to the grooves 12a of the magnetic pole 12 at both left and right ends thereof, and providing coil contact surfaces 17, 17 between these contact concave surfaces 20, 20.

The sheet contact concave surfaces 20, 20 are formed by grooves 1 on both sides of the magnetic pole 12, as shown in FIGS. 3 and 5.
The insulating sheet 1 has a curved surface shape similar to the curved surface shape of the inner part in 2a, and as shown in FIG.
The protruding height A from the end surface 11a of No. 5 is approximately the same. The sheet contact concave surfaces 20, 20 are continuous to the deep part of the groove 12a, and are connected to the protruding portion of the insulating sheet 15 from the outer surface thereof.
That is, it is provided so as to be in contact with the coil 13 from the opposite side.

Further, the coil contact surfaces 17, 17 are connected to the coil 13.
The concave surface is in contact with the arcuate inner peripheral surface of the protruding portion from the stator core 11 , and is continuous with the end of the seat contact concave surface 20 opposite to the stator core 11 . It is formed so that it gradually becomes shallower as it goes from the upper part to the center. Therefore, the coil contact surfaces 17, 17
The bottom is provided in a convex shape as shown by the dotted line in FIG.

As described above based on the embodiments, in the stator of the small motor of this invention, the protruding portion of the insulating sheet 15 from the end surface 11a of the stator core 11 is provided with a coil holder from the side opposite to the coil 13. Seat contact concave surface 2 of support portion 16 at 14
0,20 are in contact. For this reason, coil 1
Due to the rigidity of No. 3, the external pressure acting on the insulating sheet 15 during coiling is supported by the sheet contact concave surfaces 20, 20 of the support portion 16.
The protruding portion of the insulating sheet 15 from the stator core 11 is prevented from bending. Therefore, since a flexible material can be used for the insulating sheet 15, the coil 13 will not be bent strongly at both ends of the insulating sheet 15, and the insulating coating of the coil 13 will not be peeled off. Further, the support portion 16 in contact with the coil 13
The coil contact surface 17 of the sheet contact concave surface 20,2
Since the coil 13 is formed in a concave shape that gradually becomes shallower from both ends to the center of the supporting portion 16, the protruding portion of the coil 13 from the stator core 11 smoothly runs along the coil contact surface 17. It is provided along the line and will not be bent locally. Therefore, damage to the coil 13 can be prevented.

Note that this invention is not limited to the embodiments described above. For example, coil contact surfaces 17, 17
may be formed only on the end side of the insulating sheet 15.

According to this invention configured as described above, the sheet contact concave surfaces formed at both left and right ends of the support portion of the coil holder support the protruding portion of the insulating sheet from the stator core and prevent it from bending. , it is possible to use a soft insulating sheet, and the protruding portion of the coil from the stator core is supported from the inside side by a concave coil contact surface provided on the support portion continuous with these sheet contact recesses. By doing so, local bending of the coil can be prevented. Therefore, there is an effect that damage to the insulating sheet and the coil can be prevented with a simple configuration.

[Brief explanation of the drawing]

Fig. 1 is a plan view of the main parts of a conventional stator, Figs. 2 to 5 show an embodiment of this invention, Fig. 2 is a perspective view of the main parts of the stator, and Fig. 3 is a plan view of the main parts of the stator. FIG. 4 is a side view of the main part, and FIG. 5 is a perspective view showing a part of the coil holder. 11... Stator core, 11a... End surface, 12
...Magnetic pole, 12a...Groove, 13...Coil, 14
...Coil holder, 15...Insulating sheet, 16...
...Support part, 17...Coil contact surface, 20...Seat contact concave surface.

Claims (1)

[Claims for Utility Model Registration] A stator core, a coil wound around a magnetic pole of the stator core, a coil holder that is attached to the stator core to hold the coil in a fixed shape, and a stator core and the coil. an insulating sheet inserted between the stator core and having both ends thereof protruding from the end surface of the stator core; a supporting portion having a height greater than that of the sheet; sheet contacting concave surfaces corresponding to the grooves of the magnetic poles are provided at both left and right ends of the supporting portion, and a coil contacting surface is provided between these contacting concave surfaces; The contact concave surface has a curved surface shape similar to the curved surface shape of the deep part of the groove on both sides of the magnetic pole, and is formed to have a height comparable to the protrusion height from the end surface of the insulating sheet. The coil contact surface is a concave surface that contacts the inner peripheral side of the protruding portion of the coil from the stator core, and the coil contacting surface is provided continuously in the deep part of the groove so as to contact the protruding portion of the insulating sheet from the outer surface. A stator for a small motor, characterized in that the seat contacting concave surface is continuous with an end opposite to the stator core and becomes gradually shallower from both ends of the supporting portion toward the center.