JPH0723015Y2 - Electric motor stator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Field of Industrial Application) The present invention relates to a stator of an electric motor having an improved structure for fixing a lead wire to a stator.

(Prior Art) A conventional stator of an electric motor is shown in FIG. That is, the outer surface portion of the stator core 1 and the inner surface portion of the slot 2 are resin-molded as shown by the coating resin 3 for insulation coating, and the coil 4 is housed in the slot 2 in this state. Also,
The lead wire 5 is inserted into the slot 2 and fixed under pressure by the coil 4, and the end portion 4a of the coil 4 is wound around the end portion and connected by soldering. Then, the connecting portion between the end 4a of the coil 4 and the lead wire 5 is inserted into the varnish tube 6 and then pushed between the coating resin 3 and the coil 4 in the slot 2.

(Problems to be Solved by the Invention) In the above-mentioned configuration, not only is there a problem that the work of inserting the lead wire 5 between the slot 2 and the coil 4 before connection is troublesome and takes a lot of work time. After that, since the varnish tube 6 accommodating the connection portion between the coil 4 and the lead wire 5 is pushed between the slot 2 and the coil 4, the coil 4 is easily damaged by the edge portion of the varnish tube 6, As a result, there is a problem that the coil 4 is broken. Further, since the varnish tube 6 is required every time, there is a problem that the cost becomes high.

Therefore, the purpose of the present invention is to easily fix the lead wire to shorten the working time, to prevent the occurrence of wire breakage without damaging the coil, and to further reduce the cost.
It is an object of the present invention to provide a stator of an electric motor that can easily connect a lead wire and an end of a coil.

[Structure of the Invention] (Means for Solving the Problems) The stator of the electric motor of the present invention has a structure in which the outer surface portion of the stator core and the inner surface portion of the slot are insulation-coated with a resin mold.
A pair of holding pieces having a hook shape in cross section and a hook shape opposite thereto are integrally formed at a portion of the coating resin on the outer surface side of the stator core, and lead wires are inserted between these holding pieces to hold them. In addition, an auxiliary holding piece having a groove portion for inserting and holding the end portion of the lead wire is integrally formed near the holding piece, and the end portion of the lead wire is connected to the end portion of the coil. There is a feature in doing so.

(Operation) According to the above means, since the lead wire is held at the portion on the outer surface side of the stator core only by inserting it between the pair of holding pieces, the work is easy. Further, the lead wire is held immovably in a predetermined relational position with respect to the stator core, and the outer surface of the stator core is resin-coated, so that the connecting portion between the lead wire and the end of the coil is fixed. Insertion into the varnish tube for insulation can be omitted. Further, the ends of the lead wires are held and fixed by the auxiliary holding pieces, and the ends of the coils can be connected in this state.

(Embodiment) An embodiment of the present invention will be described below with reference to FIGS. 1 to 5. First, in FIG. 1 and FIG. 2, 11 is a stator iron core, for example, 16 slots 12 along the inner peripheral portion.
Are formed. Reference numeral 13 is a coating resin, which is formed by insulatingly coating the outer surface portion, that is, both end surface portions and the outer peripheral portion of the stator core 11 and the inner peripheral surface portion of the slot 12 with a resin mold. Reference numeral 14 is a coil housed in the slot 12. Reference numeral 15 denotes three lead wire holding portions, which have hook-shaped cross sections integrally formed with the coating resin 13 on the outer surface side portion of the stator core 11, as shown in FIGS. 3 and 4. One holding piece 16 that is elastically deformable is formed, and the other holding piece 17 that is also elastically deformable and has a hook shape that opposes the one holding piece 16, and the tip portions 16a, 17a thereof. There is a slight gap between them. 18 is a lead wire holding portion 15 of the above-mentioned coating resin 13.
A groove 18a is formed in the center of the protrusion piece as an auxiliary holding piece integrally formed corresponding to the above. Reference numeral 19 designates three lead wires, which are advanced in the direction shown by the arrow in FIG. 5, and elastically deform one holding piece 16 and the other holding piece 16 and 17 of the lead wire holding portion 15 while leading ends 16a, When the lead wire is held in the gap of 17a, the one and the other holding pieces 16 and 17 elastically restore at the time of passing through the gap and the tip portions 16a and 17a press the outer peripheral portion of the lead wire 19, thereby holding the lead wire. It is held in the part 15 (see FIG. 3). In this case, the end portion of the lead wire 19 is in contact with the lower surface of the protruding piece 18, and the core wire 19a at the end portion is inserted and held in the groove portion 18a of the protruding piece 18 with a slight press fit. The end portion 14a of the coil 14 is connected to the lead wire 19 by soldering while being wound around the core wire 19a of the lead wire 19 as shown in FIG.

According to the above-described embodiment having such a configuration, the lead wire 19 is held at the portion on the outer surface side of the stator core 11 only by inserting it between the pair of holding pieces 16 and 17, so that an external force is applied to the lead wire 19. Even if a force is applied, the connecting portion of the coil 14 with the end portion 14a, that is, the core wire 19a does not move, it is possible to reliably prevent disconnection and disconnection of the connecting portion due to external force, and to fix the lead wire 5, this lead wire The work can be remarkably simplified, the work time can be shortened, and the cost can be reduced as compared with the conventional case in which 5 is inserted into the slot 2. Further, the connecting portion between the lead wire 19 and the coil 14 is held at a predetermined relation position with respect to the stator core 11,
Moreover, since the outer surface portion of the stator core 11 is resin-coated with the coating resin 13, no special insulation treatment is required. Therefore, it is not necessary to insert the connecting portion between the lead wire 5 and the coil 4 into the varnish tube 6 for insulation, the varnish tube 6 and the labor of the insertion can be omitted, and the cost can be further reduced. In this case, it is not necessary to push the varnish tube 6 between the slot 2 and the coil 4, so that damage to the coil 14 and disconnection can be prevented. Furthermore, the end portion of the lead wire 19 holds the core wire 19a in the groove portion 18a of the protruding piece 18 and is fixed, and in this state, the end portion 14a of the coil 14 can be connected, so that the end portion of the lead wire 19 can be held with one hand. Hold and leave one hand on the end of coil 14
It is possible to easily connect the end portion 14a of the coil 14 to the lead wire 19 with only one hand without the trouble of connecting the 14a.

[Effects of the Invention] As is apparent from the above description, in the stator of the electric motor of the present invention, a pair of holding pieces are integrally formed at the stator core outer surface side portion of the coating resin of the stator core and these holding pieces are integrally formed. A lead wire is inserted and held between the pieces, and an auxiliary holding piece having a groove portion for inserting and holding the end portion of the lead wire is integrally formed near the holding piece. Since the end of the coil is connected to the end, the work is easy and the work time can be shortened, and the occurrence of coil breakage can be prevented without damaging the coil,
Further, it has an excellent practical effect that the cost can be reduced and the end portion of the coil can be easily connected to the lead wire.

[Brief description of drawings]

1 to 5 show an embodiment of the present invention. FIG. 1 is a perspective view of a main part, and FIG. 2 is a II- line in FIG.
A sectional view taken along line II, FIG. 3 is a sectional view taken along line III-III in FIG. 1, FIG. 4 is a plan view seen from the IV direction in FIG. 1, and FIG. 5 is an exploded perspective view of main parts. FIG. 6 is a view corresponding to FIG. 2 of the conventional example. In the figure, 11 is a stator core, 12 is a slot, 13 is a coating resin,
Reference numeral 14 is a coil, 14a is an end portion, 15 is a lead wire holding portion, 16 and 17 are holding pieces, 18 is a protruding piece (auxiliary holding piece), 18a is a groove portion, 19 is a lead wire, and 19a is a core wire.

Claims (1)

[Scope of utility model registration request] 1. An outer surface portion of a stator core and an inner surface portion of a slot are insulation-coated with a resin mold, a coil is wound around the stator core, and a lead wire is connected to an end portion of the coil. A portion of the coating resin on the outer surface side of the stator core is formed integrally with a pair of holding pieces for holding the lead wire by forming a hook shape in cross section and a hook shape opposite to the hook shape. An auxiliary holding piece, which has a groove portion for inserting and holding the end portion of the lead wire, is integrally formed near the holding piece, and the end portion of the lead wire is connected to the end portion of the coil. And the stator of the electric motor.