JPH0549201A - Mold motor - Google Patents

Abstract

PURPOSE:To obtain a stator for a mold motor, capable of obtaining predetermined characteristics and functions, by a method wherein a small diametral hole is provided at the outer peripheral side of the coil end arranging part of a stator core and a stepped fixing pin is inserted thereinto to set it into a mold and effect seal molding by pouring resin thereinto thereafter. CONSTITUTION:The main body 1 of a mold motor is produced by seal molding of the whole of an insert 5, consisting of the insert 5 having a configuration in which coil ends 3 are projected from both sides of a stator core 2, a fixing pin 1a inserted into the small diametral hole 2a of the stator core 2 at the outer peripheral side of the coil ends which are cast simultaneously by mold resin 4. In this case, a plurality of fixing pins 1a can be inserted into a plurality of small diametral holes 2a in accordance with necessity. The positioning section 6a of a movable mold 6 is employed for preventing the rightward positional deviation of the insert 5 while the fixing pins 1a are employed for preventing the leftward positional deviation. The fixing pin 1a is inserted previously into the small diametral hole 2a before setting the insert 5 into the seal molding mold.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the production of a so-called molded motor in which an electric motor stator coil is sealed and molded with resin.

[0002]

2. Description of the Related Art A conventional technique will be described with reference to the drawings. FIG. 6 is an example of a cross-sectional view of a conventional conventional molded motor stator. The stator composed of the stator core 2 and the coil end 3 is sealed and molded with the molding resin 4 to form the structure of the molded motor stator body 1.
Due to the injection pressure inside the molding die and the flow of the molding resin 4, the motor stator coil, which is the stator core 2 and the coil end 3, the so-called insert 5 does not stay in the expected normal position, but the left and right in FIG. Displacement occurs in the direction of. That is, the dimensions of LS and OS in FIG. 6 do not become normal dimensions, and variations occur. L
When variations in the dimensions of S and OS occur, the characteristics required for the motor cannot be obtained, resulting in a defective product. When the variation extremely occurs, the coil end 3 may be exposed to the mold resin 4 on one side.

Further, in order to avoid these phenomena, if measures such as lowering the injection pressure of the mold resin 4 into the mold or slowing the injection speed are taken, voids are generated in the molding portion of the mold resin 4. The occurrence of unfilled parts, the occurrence of welds, etc. is liable to occur, and the tolerance for variations in sealing molding conditions is lost, making molding practically impossible.

[0004]

The problem to be solved by the present invention is that the so-called insert 5 of the motor stator coil is used.
When the mold resin 4 is previously set in a mold for sealing molding and then the mold motor stator body 1 is manufactured by injecting the mold resin 4 into the mold, the insert is performed by the pressure and flow of the mold resin 4 to be injected. 5 is moving (positional shift). The present invention solves the above-mentioned problems of the prior art,
The purpose is to obtain a stator for a molded motor that provides the specified characteristics and functions.

[Means for Solving the Problems]

According to the present invention, one or a plurality of small-diameter holes are provided in advance on the outer peripheral side of the coil end arrangement portion of the stator core constituting the stator coil, and the rod-shaped and stepped shape is fixed to the small-diameter holes. A mold motor is characterized in that one or more pins are inserted and set in a mold, and then resin is injected to perform sealing molding.

[0006]

The insert 5 is fixed inside the sealing mold by the positioning portion 6a of the movable mold 6 of the sealing mold that sets the insert 5 and the fixed pin 1a that is inserted in advance in the insert 5, and the gate 8 The displacement of the insert 5 due to the behavior of the resin injected under pressure is further suppressed.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The configuration of an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a sectional view of a molded motor stator body 1 according to an embodiment of the present invention. FIG. 2 is a cross-sectional view of essential parts showing a state in which the insert 5 is set in the sealing molding die.

The molded motor stator main body 1 of FIG. 1 has inserts 5 of coil ends 3 on both sides of the stator core 2 which are in the shape of a trip, and a small diameter hole 2a of the stator core 2 on the outer peripheral side of the coil ends 3. The inserted fixing pin 1a is simultaneously cast with the molding resin 4 to seal and mold the entire insert 5. At this time, the fixing pin 1a has a plurality of small diameter holes 2
There is no problem even if a plurality of them are inserted into a.

The insert 5 uses the positioning portion 6a of the movable mold 6 for preventing the positional displacement to the right in FIG. 2, and the fixing pin 1a for preventing the positional displacement to the left in FIG.
To use. These two points prevent lateral displacement. The fixing pin 1a is previously inserted into the small diameter hole 2a provided on the outer peripheral side of the coil end 3 of the stator core 2 before the insert 5 is set in the sealing molding die. Further, the insert 5 is a movable mold 6 of a sealing molding die.
When it is inserted into, the positioning portion 6a is pressed to perform positioning. The positioning portion 6a is the stator core 2
The stepped shape is based on the end surface on the inner diameter side. In this state, resin is injected into the cavity 9 from the gate 8 and the insert 5 and the fixing pin 1a are sealed and molded, so that the insert 5 having no positional deviation can be provided.

The positioning reference of the insert 5 in the sealing mold is the inner diameter of the stator core 2, both end surfaces, and the fixing pin 1a. Therefore, the fixed pin 1a has such a length that it comes into contact with the inner surface of the cavity 9 of the fixed mold 7 when the mold surfaces of the movable mold 6 and the fixed mold 7 contact each other.

Next, the operation will be described. One or more fixing pins 1a shown in FIG. 3A are inserted into a small diameter hole 2a provided on the outer peripheral side of the coil end 3 of the stator core 2 shown in FIG. It becomes the insert 5 for performing. The insert 5 is set in the movable mold 6 of the sealing mold shown in FIG. 2, and at this time, the insert is inserted until the end surface of the stator core 2 on the inner diameter side hits the step of the positioning portion 6a. Thereafter, in this state, the movable mold 6 and the fixed mold 7 are matched and clamped, and the mold resin 4 is injected under pressure from the gate 8 to manufacture the mold stator body 1.
At this time, the positional deviation of the insert 5 due to the behavior of the mold resin 4 injected under pressure is corrected by the positioning portion 6a and the fixing pin 1a.
To suppress.

The fixing pin 1a has a so-called taper pin shape in which the diameter becomes smaller toward the outer surface of the mold motor stator core 1, and the fixing pin 1a does not fall outside after the sealing molding with the molding resin 4. I am trying.

In accordance with the present invention, LS and O in FIG.
It is now possible to easily and surely obtain the molded motor stator main body 1 having a predetermined dimension with no variation in the S dimension. (Other embodiments)

As another example, FIG. 5 will be described. In the case of FIG. 5, the fixing pin 1a is inserted into the small diameter holes 2a on both sides of the stator core 2 to position the insert 5. The fixed pin 1a in this case is the same as the OS and LS shown in FIG.
Set the dimensions so that the length traveled from the end surface of the stator core 2 is almost the same. For the fixing pin, see Fig. 3.
It is also possible to adopt a system in which the fixing pin of (b) does not fall off.

[0015]

According to the present invention, the displacement of the insert is eliminated, and the molded motor stator body having predetermined characteristics and functions can be obtained easily and reliably.

[Brief description of drawings]

FIG. 1 is a sectional view of a main part of a molded motor stator body according to an embodiment of the present invention,

FIG. 2 is a cross-sectional view of an essential part of an insert state of a die for manufacturing the die shown in FIG. 1,

3A is an application example diagram of a fixed pin, FIG. 3B is an application example diagram of a fixed pin,

FIG. 4 is a front view of a stator coil,

FIG. 5 is an application example diagram of positioning using fixing pins on both sides of a fixed iron core,

FIG. 6 is a view corresponding to FIG. 1 of the related art.

[Explanation of symbols]

1 ... Molded motor stator core 1a, 1b ... Fixed pin 2 ... Stator core 2a ... Small diameter hole 3 ... Coil end 4 ... Mold resin 6 ... Movable mold 7 ... Fixed mold

Claims (1)

[Claims] 1. A small-diameter hole is provided in advance on the outer peripheral side of a coil end arrangement portion of a stator core constituting a stator coil, and a rod-shaped and stepped fixing pin is provided in the small-diameter hole. A mold motor, characterized by inserting one or more of them, setting them in a mold, and then injecting a resin for sealing molding.