JPH04275050A - Manufacture of resin mold motor - Google Patents

Abstract

PURPOSE:To suppress the height in thickness direction of a coil end so as to thin it by trimming the shape of the coil end in forming a cover. CONSTITUTION:A pressing plate 1 is inserted in a mold 3 so that the flange 8 may turn up, and a stator core 5 where winding is applied is set along a pole 6, and thereon the pressing plate 1 is inserted so that the flange 8 may turn down, and the upper mold 2 is set on the pole 6 and is put thereon. When clamping pressure is added in this condition, the upper and lower pressing plates 1 are pushed by a plurality of pins 4, and push the coil end of the winding against the side of the stator core 5, and the coil end is trimmed to be get in the range of certain dimensions. Thereupon, by injecting and hardening thermosetting resin where in fillers are mixed, cover is made. At this time, the flange 8 of the pressing plate 1 can suppress the protrusion of the coil end 10 when it has pressed the coil end 9, and also prevent the fall of the coil end 9 by the pressure of resin injection at the gate part 7.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to resin molded motors, and more particularly to means for shaping stator windings.

0002

[Prior Art] Conventionally, when a stator winding is inserted into a stator core using an inserter, after insertion, the coil end is shaped using a coil shaping machine and bound with a binding thread, and then varnish is applied to maintain that state. As shown in Figure 4, the stator core is held in the mold, and thermosetting resin mixed with a filler is injected and solidified through the gate of the mold to form an outer sheath around the windings and the stator core. A method is being taken to do so. In this case, it is necessary to leave an appropriate gap between the side of the stator core and the coil end to bind with the bind thread, and when binding with the bind thread, no force is applied to the coil end in the direction of the stator core. , The shape of the coil end after binding varies, the height of the coil end in the thickness direction varies, and it becomes necessary to thicken the outer cover to ensure insulation of the coil end, which hinders the thinning of the product. There is.

0003

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional problems.The present invention has been made in view of the above-mentioned conventional problems. The purpose is to provide a resin molded motor that is thinner.

0004

[Means for Solving the Problems] In order to achieve the above object, the coil end of a stator core with a wire wound thereon is placed in a molding die with a presser plate placed over it, and the presser plate is formed in the molding die. The coil ends are shaped by pressing them against the stator core side using multiple pins, and thermosetting resin mixed with filler is injected and solidified through the gate of the molding die to form an outer sheath around the windings and stator core. I made it. In addition, a holding plate is placed over the coil end of the wound stator core and placed in a molding die, and multiple bosses or ribs formed on the outside of the holding plate are pressed against the stator core to shape the coil end. Then, a thermosetting resin mixed with a filler was injected through the gate of the mold and solidified to form an outer cover around the windings and the stator core.

[0005]

[Function] According to the above structure, the coil end of the stator core with windings is covered with a presser plate and placed in the molding die, and the coil end is held at the same time as the mold is clamped by the plurality of pins provided in the molding die. By pressing the coil end against the stator core, the coil end can be shaped to a certain height. Furthermore, by forming a plurality of bosses or ribs on the outside of the presser plate and arranging them in the mold, the same effect can be achieved without providing a plurality of pins in the mold.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Examples of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a side cross-sectional view showing details of the present invention, showing a state in which a presser plate 1 and a stator core having windings are attached to a molding die. The stator core has a plurality of grooves formed inside thereof, into which concentrically wound windings are inserted through an insulator. The molding molds are upper mold 2 and lower mold 3.
A pillar 6 is formed in the center of the bottom surface of the lower mold 3 and extends to the upper mold by fitting into the inner diameter of the stator core 5 to support the stator core 5 in a predetermined position, and a plurality of pins 4 protrude from predetermined positions on the bottom surface. A gate 7 is provided on the top surface for injecting molding resin from the outside. Similar to the lower mold 3, a plurality of pins 4 are provided at predetermined positions in the center of the lower surface of the upper mold 2, and a cylindrical groove that fits into the support column 6 of the lower mold is formed in the center of the lower surface. The holding plate 1 is made of heat-resistant insulating resin, has a disk shape slightly smaller than the outer diameter of the stator core 5, and has a hole in the center through which a support 6 is inserted and a flange 8 raised on the outer periphery.

[0008] A method of manufacturing the above structure will be explained. First, insert the presser plate 1 into the lower mold 3 with the flange 8 facing upward, and insert the stator core 5 with the windings onto the support 6.
, insert the holding plate 1 thereon so that the flange 8 faces downward, and fit the upper mold 2 over the support 6 and cover it. In this state, when clamping pressure is applied, the upper and lower presser plates 1 are pushed by the plurality of pins 4 and press the coil end 9 of the winding toward the stator core 5 side, so that the coil end 9 falls within a certain size range. Shaped. Then, a thermosetting resin mixed with a filler is injected through the gate 7 and solidified to form an outer cover. At this time, flange 8 of presser plate 1
is, when coil end 9 is pressed, coil end 10
It is possible to suppress the protrusion of the coil end 9 and prevent the coil end 9 from collapsing due to resin injection pressure at the gate 7 portion.

2 and 3, instead of providing a plurality of pins 4 in the mold, a plurality of bosses 10 are provided on the outside of the presser plate 1.
Alternatively, in the case where the rib 11 is formed, the coil end 9 is pressed against the stator core 5 side by the presser plates 1 placed above and below the coil end 9 of the stator winding, and the coil end 9 is shaped to fall within a certain size range. be able to.

0010

As described above, in the present invention, the coil end of the stator winding is covered with a presser plate, and the coil end is pressed against the stator core at the same time as the mold is clamped using a plurality of protruding pins provided on the molding die. By injecting the thermosetting resin, it is possible to ensure the insulation thickness of the coil end and prevent the coil end from collapsing or protruding due to resin injection.

At the same time, the conventional work of binding the coil ends, fixing with varnish, and drying can be omitted, thereby shortening the work process and reducing costs.

[Brief explanation of the drawing]

FIG. 1 is a side sectional view showing details of the present invention when a molding die is set.

FIG. 2 is a side sectional view showing another embodiment of the presser plate.

FIG. 3 is a side sectional view showing another embodiment of the presser plate.

FIG. 4 is a side sectional view when a conventional molding die is set.

[Explanation of symbols]

1 Presser plate 2 Upper mold 3 Lower mold 4 Pin 5 Stator core 6 Pillar 7 Gate 8 Flange 9 Coil end 10 Boss 11 Rib

Claims (2)

[Claims] Claim 1: A holding plate is placed over the coil end of a stator core having windings, and the holding plate is placed in a molding die, and the holding plate is pressed against the stator core side by a plurality of pins formed in the forming die to form a coil. A resin molded motor characterized in that the end is shaped, a thermosetting resin mixed with a filler is injected and solidified through the gate of a molding die, and an outer sheath is formed around the outer periphery of the windings and stator core. Production method. 2. The coil end of the stator core with wire wound is placed in a molding die with a presser plate placed over it, and the coil is pressed toward the stator core by a plurality of bosses or ribs formed on the outside of the presser plate. A resin molded motor characterized in that the end is shaped, a thermosetting resin mixed with a filler is injected and solidified through the gate of a molding die, and an outer sheath is formed around the outer periphery of the windings and stator core. Production method.