JP6699466B2 - Resin molding method for stator - Google Patents

Description

  The present invention relates to a method of resin-molding a stator, for example, a method of resin-molding a stator by sandwiching a stator having a terminal block with a mold and injecting resin into the cavity of the mold.

  Generally, the coil of the stator and the like are molded with resin and fixed to the stator core so as not to be damaged or fallen off by vibration during use. In this way, when the stator is resin-molded, if the resin entrains the air in the mold, voids occur and the quality deteriorates.

  Therefore, for example, in Patent Document 1, as shown in FIG. 10 and FIG. 11, a discharge port 102a for discharging air from the inside of the cavity of the mold to the outer surface of the base portion 102 of the terminal block 101 in the stator. There is disclosed a technique for discharging air in the mold from the discharge port 102a when the stator is formed by resin molding. Incidentally, the terminal portion 103 connected to the coil is passed through the base portion 102.

Patent No. 5942966

  The technique of Patent Document 1 can discharge the air in the mold from the discharge port 102a, but cannot suppress the outflow of the resin 104 from the discharge port 102a. Therefore, when the resin 104 flows out from the discharge port 102a, post-processing for removing the resin 104 that has flowed out is required, which increases the number of processing steps and increases the processing cost.

  The present invention has been made in view of the above problems, and realizes a resin molding method for a stator, which is excellent in discharging air in a mold and can prevent resin from flowing out from a terminal block. To do.

A resin molding method of a stator according to an aspect of the present invention is a method of resin-molding the stator by sandwiching a stator having a terminal block with a mold and injecting a resin into a cavity of the mold,
A spiral or crank-shaped air continuous from the inside of the mold cavity to the outside of the mold with the stator sandwiched by the mold on the peripheral surface of the insertion hole through which the terminal wire is inserted in the terminal block. A discharge path is formed, and the terminal wire is heated when the resin is injected into the cavity of the mold.
As a result, it is possible to excellently discharge the air in the mold and to prevent the resin from flowing out from the terminal block.

  ADVANTAGE OF THE INVENTION According to this invention, the discharge|emission property of the air in a metal mold|die is excellent, and the outflow of resin from a terminal block can be suppressed.

It is a top view which shows typically the stator core resin-molded. It is a fragmentary sectional view showing typically a stator core resin-molded. It is the figure which looked at the terminal block of a stator core from the extension direction of a terminal wire. FIG. 4 is a sectional view taken along the line IV-IV of FIG. 3. It is a figure which shows typically the state at the time of injecting resin into a metal mold|die. It is a figure which shows the state injecting resin into a metal mold|die typically. It is a figure which shows typically the state after injecting resin into a metal mold|die. It is a figure which shows typically the state when resin flows in into an air discharge path. It is a fragmentary sectional view showing typically a resin-molded stator. It is the figure which looked at the terminal block of a general stator core from the extension direction of a terminal wire. It is a top view which shows the terminal block of a general stator core.

  Hereinafter, specific embodiments to which the present invention is applied will be described in detail with reference to the drawings. However, the present invention is not limited to the following embodiments. Further, the following description and drawings are simplified as appropriate for the sake of clarity.

  First, the structure of the resin-molded stator will be briefly described. FIG. 1 is a plan view schematically showing a resin-molded stator core. FIG. 2 is a partial cross-sectional view schematically showing a resin-molded stator core. FIG. 3 is a view of the terminal block of the stator core viewed from the extending direction of the terminal wire. 4 is a sectional view taken along the line IV-IV in FIG.

  As shown in FIGS. 1 and 2, the stator 1 includes a stator core 2, an insulator 3, a coil wire 4, and a terminal block 5. The stator core 2 is formed by laminating a plurality of electromagnetic steel plates 2a, and includes a yoke portion 2b, a tooth portion 2c, and a slot portion 2d. By the way, in FIG. 1, the coil wire 4 is shown as a simplified cross-sectional view.

  The insulator 3 is inserted into the slot portion 2d of the stator core 2 to insulate the stator core 2 from the coil wire 4, and is an insulating slot paper. The coil wire 4 is wound around a predetermined tooth portion 2c of the stator core 2. Here, since the stator 1 of the present embodiment is configured as a stator of a three-phase motor, the R-phase coil wire, the S-phase coil wire, and the T-phase coil wire are collectively referred to as the coil wire 4. .

  The terminal block 5 includes a terminal wire 5a and a base portion 5b. The terminal wire 5a is electrically connected to the coil wire 4. Then, as shown in FIGS. 1 and 2, the terminal wire 5 a projects outward with respect to the coil wire 4 and extends in a substantially radial direction of the yoke portion 2 b of the stator core 2. Here, since the stator 1 of the present embodiment is configured as a stator of a three-phase motor as described above, the R-phase terminal line, the S-phase terminal line, and the T-phase terminal line are collectively referred to. The terminal line 5a is used.

  As shown in FIGS. 3 and 4, the base portion 5b has an insertion hole 5c through which the terminal wire 5a is inserted. Here, although the insertion hole 5c will be described in detail later, when the stator 1 is sandwiched by the molds 6, one opening is arranged in the cavity of the mold 6 and the other opening is formed in the mold 6. It is arranged outside the cavity (for example, outside the mold 6).

  An air discharge path 5d is formed on the peripheral surface of the insertion hole 5c. The air discharge path 5d is a groove formed on the peripheral surface of the insertion hole 5c, and is continuous from one opening to the other opening. The air discharge path 5d is formed in a spiral shape or a crank shape. As described above, in the present embodiment, since the air discharge path 5d is formed on the peripheral surface of the insertion hole 5c, the air discharge path 5d can be formed in a complicated shape that cannot be formed on a flat surface. Incidentally, in FIGS. 3 and 4, the terminal line 5a is shown by an imaginary line in order to clearly show the air discharge path 5d.

  Next, a flow of resin-molding the stator 1 having the above configuration will be described. FIG. 5: is a figure which shows typically the state at the time of injecting resin into a metal mold|die. FIG. 6 is a diagram schematically showing a state where resin is being injected into the mold. FIG. 7: is a figure which shows typically the state after injecting resin into a metal mold|die. FIG. 8 is a diagram schematically showing a state when the resin flows into the air discharge path. FIG. 9 is a partial sectional view schematically showing a resin-molded stator.

  In this embodiment, as shown in FIG. 5, a movable die 7 and a fixed die 8 are provided as the die 6. Then, first, the stator 1 is arranged in the movable die 7, the movable die 7 is moved toward the fixed die 8, and the stator core 2 is sandwiched between the movable die 7 and the fixed die 8. As a result, the movable die 7, the fixed die 8 and the stator 1 seal the space inside the die 6 to form a cavity, and one opening of the air discharge path 5d is placed in the cavity of the die 6. The other opening of the air discharge path 5d is arranged outside the cavity of the mold 6.

  At this time, the terminal wire 5a of the terminal block 5 in the stator 1 is extended toward the ceiling direction which is the opposite side to the gravity direction. As a result, one opening of the air discharge path 5d is arranged in the direction of gravity with respect to the other opening, and when the resin 9 is injected into the cavity of the mold 6, the resin 9 flows into the air discharge path 5d. Inflow can be suppressed.

  Next, as shown in FIG. 6, the energization unit 10 is used to energize the terminal wire 5a of the terminal block 5 in the stator 1 to heat the terminal wire 5a, and the gate 8a of the fixed mold 8 to move the mold 6 Resin 9 is injected into the cavity. At this time, the air in the cavity of the mold 6 is pushed out of the air discharge path 5d by the resin 9. This can prevent the resin 9 from entraining the air in the cavity of the mold 6. Therefore, the generation of voids can be suppressed, which contributes to the improvement of quality.

  Further, when the resin 9 is injected into the cavity of the mold 6 and the inside of the cavity of the mold 6 is filled with the resin 9 as shown in FIG. 7, the resin 9 is injected from one opening of the air discharge path 5d. It flows into the air discharge path 5d. At this time, since the terminal wire 5a is heated as described above, the resin 9 flowing into the air discharge path 5d is heated and cured as shown in FIG. This can prevent the resin 9 from flowing out from the other opening of the air discharge path 5d.

  Finally, the movable die 7 is moved away from the fixed die 8 and the resin-molded stator 1 is taken out, and the resin molding of the stator 1 is completed. At this time, in the resin-molded stator 1, as shown in FIG. 9, since the resin 9 does not flow out from the other opening of the air discharge path 5d, there is no need for post-processing to remove the resin 9 that has flowed out. The processing man-hours can be reduced and the processing cost can be suppressed.

  As described above, the resin molding method for the stator 1 according to the present embodiment is excellent in discharging air from the mold 6 and can prevent the resin from flowing out from the terminal block 5.

  The present invention is not limited to the above-mentioned embodiments, but can be modified as appropriate without departing from the spirit of the present invention.

DESCRIPTION OF SYMBOLS 1 stator 2 stator core, 2a electromagnetic steel plate, 2b yoke part, 2c tooth part, 2d slot part 3 insulator 4 coil wire 5 terminal block, 5a terminal wire, 5b base part, 5c insertion hole, 5d air discharge path 6 mold 7 movable Mold 8 Fixed mold, 8a Gate 9 Resin 10 Energizing unit

Claims (1)

A method of resin-molding the stator by sandwiching a stator having a terminal block with a mold and injecting a resin into a cavity of the mold,
A spiral or crank-shaped air continuous from the inside of the mold cavity to the outside of the mold with the stator sandwiched by the mold on the peripheral surface of the insertion hole through which the terminal wire is inserted in the terminal block. A resin molding method for a stator, wherein a discharge path is formed and the terminal wire is heated when the resin is injected into the cavity of the mold.

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