TW201528656A - Encapsulated stator - Google Patents

Abstract

An encapsulated stator including a stator, a circuit board and an encapsulant is disclosed. The stator includes a core and a coil unit, wherein the coil unit is wound around the core. The circuit board electrically connects the coil unit, and the circuit board includes an encapsulant injection port and an air vent. The encapsulant encapsulates the stator and the circuit board. The encapsulant is formed by injection molding, and the encapsulant injection port of the circuit board can reduce flow path of the encapsulant while it is formed in a mold.

Description

Sealing stator

The present invention relates to a sealer stator, and more particularly to a structure in which a stator can be integrally wrapped with a sealant.

As shown in FIG. 1 , the conventional rubber-sealed stator 9 has a pole piece set 91. The pole piece set 91 is wound around a coil set 92. The coil set 92 is electrically connected to a circuit board 93 having a vent hole 931. The pole piece group 91, the coil group 92 and the circuit board 93 are covered with a sealant such as an epoxy resin 94 to form a closed-integrated stator structure, so that the conventional sealer stator 9 has a waterproof and moisture-proof effect. An embodiment similar to the sealant stator 9 is disclosed in the Chinese Patent No. 201010503545.6 "Fan Motor" invention patent.

Moreover, as shown in FIG. 2, in the above process of coating the epoxy resin 94, the conventional sealing rubber stator 9 is prepared with a mold 95 having a nozzle 951, and the assembled pole piece group 91, The coil assembly 92 and the circuit board 93 are flip-chip disposed inside the mold 95, wherein the circuit board 93 faces the nozzle 951; at this time, the epoxy resin 94 can be injected into the mold 95 through the nozzle 951, and utilized. The vent hole 931 of the circuit board 93 allows the air in the mold 95 to be smoothly and easily discharged to the outside of the mold 95 via the vent hole 931, so that the epoxy resin 94 can gradually integrally cover the pole piece group 91. The coil assembly 92 and the circuit board 93 are ready to be molded to form the desired sealant stator 9 after the epoxy resin 94 is cured to be encapsulated.

The circuit board 93 of the above-mentioned conventional rubber-sealing stator 9 is provided for supplying air flow. The vent hole 931 is opened. However, referring to FIG. 2 again, when the epoxy resin 94 is injected into the mold 95 via the nozzle 951, the epoxy 94 is oriented along the surface of the circuit board 93. The circuit board 93 flows in the outer peripheral direction, and flows back to the position of the pole piece group 91 and the coil group 92 via the outer peripheral edge of the circuit board 93 and the inner side wall of the mold 95. Therefore, it is limited by the conventional knowledge. The structure of the circuit board 93, the flow path of the epoxy resin 94 must also be a meandering flow mode, resulting in a long flow path of the epoxy resin 94 inside the mold 95, which easily causes an increase in the processing time of the sealant stator 9. Moreover, the sealant of the sealant stator 9 after molding may be prone to generate air bubbles. As a whole, the conventional sealant stator 9 has many problems such as poor manufacturing convenience, increased manufacturing cost, and poor manufacturing quality. There is a need to improve.

The main object of the present invention is to solve the problem that the sealing flow of the sealant stator in the above-mentioned mold is too long in the mold, and to provide a sealant stator structure capable of effectively shortening the flow path of the sealant in the mold.

In order to achieve the foregoing object, the sealing stator of the present invention comprises a certain subset, a circuit board and a glue. The stator assembly includes a core and a coil, the coil is wound and coupled to the core; the circuit board is electrically connected to the coil, and the circuit board is provided with a glue injection hole and a vent hole; the sealant covers the stator set and the a circuit board; wherein the glue injection hole of the circuit board is used to shorten a flow path of the sealant during injection molding in a mold.

The iron core of the stator set is provided with a plurality of pole arms, and one of the plurality of pole arms is respectively provided with a magnetic conducting portion, and the coil is wound around a plurality of pole arms of the iron core.

The space reserved between the plurality of pole arms around which the coil is wound forms a magnetic pole gap in the radial range enclosed by the plurality of magnetic conductive portions of the stator group, and the injection hole of the circuit board In the axial direction, the pair is located in the magnetic pole gap.

Each of the two adjacent pole arms has a first gap between the magnetic conductive portions, and any two adjacent coil arms wound with a coil have a second gap, the second gap and the first One The gaps together constitute the pole gap. Wherein the glue injection hole is axially opposite to the first gap between the magnetic conductive portions of any two adjacent pole arms; or the injection hole is axially opposite to any two coiled phases a second gap between the adjacent pole arms.

The diameter of the injection hole is larger than the diameter of the vent hole; wherein the diameter of the injection hole and the vent hole is preferably 2:1.

In the radial direction of the circuit board, a reference plane passing through the center of the circuit board is defined, and the reference surface divides the circuit board into two areas, and the glue injection hole and the vent hole are respectively disposed in the two areas; Further, a reference line located on one side surface of the circuit board and passing through the center thereof is defined, and the glue injection hole and the vent hole are preferably located on the same reference line.

The stator assembly further includes a shaft tube, the core is further provided with a loop portion, the magnetic pole portion is disposed at one end of the plurality of pole arms, and the other end is respectively coupled to the outer peripheral wall of the loop portion, the core ring The ring portion is coupled to the outer peripheral wall of the shaft tube.

The circuit board is disposed at one end of the stator set, and a shaft hole is disposed in the center of the circuit board, and the circuit board is sleeved with the outer peripheral wall of the shaft tube.

The stator assembly further includes an insulating member covering the surface of the core, the coil is wound around the plurality of pole arms of the core through the insulating member; wherein the insulating member can be covered by an upper insulating sleeve Insulation sleeve is composed.

The sealant may partially or completely cover the stator set and the circuit board

According to the above-mentioned sealing stator, since the circuit board is provided with a glue injection hole, the sealant can directly flow to the position of the stator group through the injection hole when manufacturing the sealing stator, so as to effectively shorten the The flow path of the epoxy resin further improves the manufacturing convenience, reduces the manufacturing cost, and improves the manufacturing quality.

〔this invention〕

1‧‧‧stator group

11‧‧‧ iron core

111‧‧‧ pole arm

112‧‧‧Magnetic Department

113‧‧‧Circle Department

12‧‧‧ coil

13‧‧‧Insulation

131‧‧‧Insulation sleeve

132‧‧‧Insulation sleeve

14‧‧‧ shaft tube

2‧‧‧ boards

21‧‧‧Axis hole

22‧‧‧ injection hole

23‧‧‧vents

3‧‧‧Packing

4‧‧‧Mold

41‧‧‧ mouthpiece

D‧‧‧Magnetic gap

L‧‧‧ baseline

S‧‧‧ datum

P‧‧‧radial range

D1‧‧‧ first gap

D2‧‧‧second gap

[study]

9‧‧‧Glue stator

91‧‧‧Magnetic pole set

92‧‧‧ coil group

93‧‧‧Circuit board

931‧‧‧Ventinel

94‧‧‧Epoxy resin

95‧‧‧Mold

951‧‧‧ mouthpiece

Fig. 1 is a schematic view showing the appearance of a conventional sealed rubber stator.

Fig. 2 is a sectional view showing a combination of a conventional sealing rubber stator placed on a mold for injection molding.

Figure 3 is a perspective exploded view of the rubberized stator of the present invention.

Figure 4 is a cross-sectional view showing the assembly of the sealer stator of the present invention.

Fig. 5 is a top plan view showing the stator assembly of the sealing stator of the present invention.

Figure 6 is a top plan view showing the circuit board of the sealing stator of the present invention opposite to the stator set.

Figure 7 is a cross-sectional view showing the assembly of the sealant stator of the present invention before it is placed on the mold for injection molding.

Figure 8 is a combined cross-sectional view showing the sealing stator of the present invention placed in a mold for injection molding.

The above and other objects, features and advantages of the present invention will become more <RTIgt; It is shown that the sealing stator of the present invention comprises at least a certain subgroup 1, a circuit board 2 and a glue 3. The circuit board 2 is disposed at one end of the stator assembly 1; the sealant 3 covers the stator assembly 1 and the circuit board 2.

The stator assembly 1 includes at least one core 11 and one coil 12. Referring to FIG. 5, the core 11 is provided with a plurality of pole arms 111. The plurality of pole arms 111 are arranged in a radial arrangement with each other. One end of the plurality of pole arms 111 is respectively provided with a magnetic pole. The portion 112 has a first gap d1 between the magnetic conductive portions 112 of any two adjacent pole arms 111. In addition, the core 11 can be various types of magnetic conductive members, for example, a plurality of silicon steel sheets can be selected. Stacking on each other to form a magnetic conductive member, or directly using a single magnetic conductive block as the magnetic conductive member or the like; the coil 12 may be an enameled wire, and the coil 12 is wound around a plurality of pole arms coupled to the core 11 111, wherein any two adjacent pole arms 111 wound with the coil 12 have a second gap d2, the second gap d2 and the first gap d1 together form a magnetic pole gap D; in other words, as in the first As shown in FIGS. 3 and 5, the magnetic pole gap D defined by the present invention refers to a plurality of coils 12 wound in a radial range P surrounded by a plurality of magnetic conductive portions 112 of the stator assembly 1. The space reserved between the pole arms 111.

The stator assembly 1 may further include an insulating member 13 . The insulating member 13 may be an insulating layer or an insulating sleeve covering a surface of the core 11 , and the coil 12 is wound and coupled by the insulating member 13 . The plurality of pole arms 111 of the core 11 can provide a better insulating effect between the core 11 and the coil 12 by using the insulating member 13. In the embodiment, the insulating member 13 is formed by an upper insulating sleeve 131 and The stator set 1 may further comprise a shaft tube 14 , and the core 11 is further provided with a loop portion 113 (shown in FIG. 3 ), and the one end of the plurality of pole arms 111 is provided with the guide The magnetic portion 112 is connected to the outer peripheral wall of the ring portion 113, and the ring portion 113 of the core 11 is coupled to the outer peripheral wall of the shaft tube 14, so that the sealing stator of the present invention can be fitted to the shaft tube 14. For easy installation in the motor structure.

The circuit board 2 is disposed at one end of the stator assembly 1 and electrically connected to the coil 12, and a shaft hole 21 is disposed in the center of the circuit board 2, so that the circuit board 2 can also be sleeved and coupled to the outer peripheral wall of the shaft tube 14. . Referring to FIG. 6 , the circuit board 2 is further provided with a glue injection hole 22 and a vent hole 23 . The number of the glue injection holes 22 and the vent holes 23 can be one or more according to actual needs. It is revealed that the number of the injection holes 22 and the vent holes 23 is one; wherein the radial direction of the circuit board 2 (referring to the direction perpendicular to the axial direction of the shaft tube 14 in the drawing) is defined by a reference plane S in the center of the circuit board 2, the reference plane S can divide the circuit board 2 into two areas, the glue injection hole 22 and the vent hole 23 are respectively disposed in the two areas, and are further defined on the circuit board 2 a side surface and a reference line L passing through the center thereof, the glue hole 22 and the vent hole 23 can be located on the same reference line L, so that the glue hole 22 and the vent hole 23 are oppositely disposed, thereby The venting opening 23 can be relatively far from the injection hole 22 to provide a better ventilation effect.

Referring to FIG. 6, the injection hole 22 of the circuit board 2 is axially aligned (in the direction of the axial direction of the shaft tube 14) in the magnetic pole gap D of the stator group 1. Wherein the glue injection hole 22 can be in the axial direction to the first gap d1 between the magnetic conductive portions 112 of any two adjacent pole arms 111, or the injection hole 22 can be located in the axial direction a second gap d2 between the adjacent pole arms 111 wound with the coil 12, whereby the sealant 3 can be directly inserted into the pole gap through the glue injection hole 22 during the injection molding process. D, in order to greatly shorten the flow path of the sealant 3 injection molding (refer to the following description); further, since the glue injection hole 22 is used for the sealant 3 to fill the glue, the vent hole 23 is used for exclusion The air in the mold, therefore, the diameter of the glue injection hole 22 can be larger than the diameter of the vent hole 23, and the diameter of the injection hole 22 and the vent hole 23 is preferably 2:1 (for example, the injection hole 22 The diameter of the vent hole is 2 mm, and the diameter of the vent hole 23 is 2 mm. Therefore, when the glue hole 22 is used for filling the glue 3, the sealant 3 has a suitable flow rate to improve the quality of the glue. .

The sealant 3 covers the stator set 1 and the circuit board 2, wherein the sealant 3 can partially cover or completely cover the stator set 1 and the circuit board 2 according to actual waterproof and moisture-proof requirements. When the stator group 1 and the circuit board 2 are all coated, the waterproof and moisture proof effect can be provided. Moreover, the sealant 3 can be waterproof and moisture-proof, such as epoxy resin or polyurethane material (PU). Materials to enhance the structural strength of the encapsulated stator of the present invention.

When manufacturing the sealing stator of the present invention, as shown in FIG. 7, a mold 4 having a nozzle 41 is prepared, and the pre-assembled stator assembly 1 and the circuit board 2 are flip-chip mounted inside the mold 4. One of the surfaces of the circuit board 2 faces the nozzle 41, and the glue injection hole 22 of the circuit board 2 is opposite to the nozzle 41; referring to FIG. 8, the epoxy resin is further passed through the nozzle 41 is injected into the interior of the mold 4, and the epoxy resin can flow directly to the position of the stator assembly 1 through the injection hole 22 of the circuit board 2, and cooperate with the vent hole 23 disposed oppositely to make the air in the mold 4 The vent hole 23 can be smoothly and easily discharged to the outside of the mold 4, so that the epoxy resin can smoothly flow inside the mold 4. Finally, when the epoxy resin integrally covers the stator set 1 and the circuit board 2 After cooling and solidifying, the sealant 3 can be formed to form a sealant stator of the present invention as shown in Fig. 4.

According to the above-mentioned sealing stator of the present invention, since the circuit board 2 is provided with the glue injection hole 22, the epoxy resin can flow through the outer peripheral edge of the circuit board 2 and the inner side wall of the mold 4 to The position of the stator assembly 1 can be directly flowed to the position of the stator assembly 1 by the injection hole 22 to effectively shorten the flow path of the epoxy resin, thereby reducing the processing time of the sealing stator of the present invention, and It avoids the generation of air bubbles in the sealed stator after molding, so as to improve the manufacturing convenience, reduce the manufacturing cost and improve the manufacturing quality.

While the invention has been described in connection with the preferred embodiments described above, it is not intended to limit the scope of the invention. The technical scope of the invention is protected, and therefore the scope of the invention is defined by the scope of the appended claims.

1‧‧‧stator group

11‧‧‧ iron core

111‧‧‧ pole arm

112‧‧‧Magnetic Department

113‧‧‧Circle Department

12‧‧‧ coil

13‧‧‧Insulation

131‧‧‧Insulation sleeve

132‧‧‧Insulation sleeve

14‧‧‧ shaft tube

2‧‧‧ boards

21‧‧‧Axis hole

22‧‧‧ injection hole

23‧‧‧vents

D‧‧‧Magnetic gap

L‧‧‧ baseline

S‧‧‧ datum

D1‧‧‧ first gap

D2‧‧‧second gap

Claims (16)

A sealing stator comprising: a certain subgroup comprising a core and a coil, the coil being wound and coupled to the core; a circuit board electrically connected to the coil, the circuit board being provided with a glue injection hole and a vent hole; A glue covering the stator set and the circuit board; wherein the injection hole of the circuit board is used to shorten a flow path of the sealant during injection molding in a mold. The sealing stator of the first aspect of the invention, wherein the core of the stator set is provided with a plurality of pole arms, one of the plurality of pole arms is respectively provided with a magnetic conducting portion, and the coil is wound and coupled to the core Several pole arms. The sealant stator of claim 2, wherein a plurality of pole arms around the coil are reserved in a radial range surrounded by a plurality of magnetic conductive portions of the stator set The space forms a magnetic pole gap, and the glue injection hole of the circuit board is located in the magnetic pole gap in the axial direction. The sealant stator of claim 3, wherein a magnetic gap between any two adjacent pole arms has a first gap between any two adjacent pole arms around which the coil is wound. Each has a second gap, and the second gap and the first gap together constitute the magnetic pole gap. The sealant stator of claim 4, wherein the glue injection hole is axially opposed to a first gap between the magnetic conductive portions of any two adjacent pole arms. The sealant stator of claim 4, wherein the glue injection hole is axially opposite to a second gap between any two adjacent pole arms around which the coil is wound. The sealant stator of claim 1, 2, 3, 4, 5 or 6, wherein the diameter of the glue injection hole is larger than the diameter of the vent hole. The sealant stator of claim 7, wherein the glue injection hole and the pass The diameter ratio of the pores is 2:1. The encapsulating stator of claim 1, wherein the reference plane of the circuit board defines a reference plane passing through the center of the circuit board, the reference plane The circuit board is divided into two areas, and the injection hole and the vent hole are respectively disposed in the two areas. The sealing stator according to claim 9, wherein in the radial direction of the circuit board, a reference line located on one side surface of the circuit board and passing through a center thereof is defined, and the injection hole and the vent hole are located On the same baseline. The sealer stator of claim 2, 3, 4, 5 or 6, wherein the stator set further comprises a shaft tube, the core is further provided with a loop portion, and one end of the plurality of pole arms is provided The other end of the magnetic conductive portion is coupled to an outer peripheral wall of the loop portion, and a loop portion of the core is coupled to an outer peripheral wall of the shaft tube. The sealing stator of claim 11, wherein the circuit board is disposed at one end of the stator set, and a shaft hole is disposed at a center of the circuit board, and the circuit board is sleeved with the shaft hole and coupled to the shaft tube Peripheral wall. The sealing stator of claim 2, 3, 4, 5 or 6 wherein the stator assembly further comprises an insulating member covering the surface of the core, the coil passing through the insulating member Winding a plurality of pole arms coupled to the core. The sealing stator according to claim 13, wherein the insulating member is composed of an upper insulating sleeve and a lower insulating sleeve. The sealant stator of claim 1, 2, 3, 4, 5 or 6, wherein the sealant partially covers the stator set and the circuit board. The sealant stator of claim 1, 2, 3, 4, 5 or 6, wherein the sealant completely covers the stator set and the circuit board.