WO2019187336A1

WO2019187336A1 - Motor

Info

Publication number: WO2019187336A1
Application number: PCT/JP2018/043657
Authority: WO
Inventors: 森岡　正之; 貴央大畑; 宜農麻生
Original assignee: パナソニックＩｐマネジメント株式会社
Priority date: 2018-03-27
Filing date: 2018-11-28
Publication date: 2019-10-03
Also published as: CN111903041B; JPWO2019187336A1; JP7281717B2; CN111903041A

Abstract

A motor comprising a housing (110) in which at least one penetrating female screw (111) is formed, a stator core (121) disposed within the housing (110), a resin (130) filled between at least the stator core (121) and the housing (110), and a sealing member (140) which seals the female screw (111) from the inside of the housing (110).

Description

motor

This disclosure relates to a motor.

Conventionally, in a motor in which a stator core is disposed in a casing, a structure in which the stator core is covered with a resin by pouring a liquid resin into the inner space of the casing and curing it is known. In such a motor, since the resin is embedded between the stator core and the housing, the heat generated by the motor can be efficiently radiated. Thereby, size reduction of a motor can be achieved.

In a motor in which a stator core is disposed in a housing, an opening for power feeding is formed in the housing in order to energize a winding coil wound around the stator core, and an electric wire such as a lead wire or a connector is formed in the opening. A structure in which a connecting member is provided is employed. As a result, electric power is supplied to the motor via the electrical connecting member, and the winding coil wound around the stator core can be energized.

However, if an opening is formed in the casing, the liquid resin may leak out from the opening of the casing when the liquid resin is poured into the inner space of the casing in order to cover the stator core with the resin.

Therefore, conventionally, a motor that can prevent liquid resin from leaking from the opening of the housing has been proposed (Patent Document 1). FIG. 12 is a perspective view showing the configuration of the motor 1001 disclosed in Patent Document 1. As shown in FIG. As shown in FIG. 12, in the motor 1001 disclosed in Patent Document 1, a sealing member 1140 such as urethane rubber is fitted into the opening 1112 of the housing 1110, and the small diameter insertion hole 1141 provided in the sealing member 1140 is inserted. The lead wire 1150 is inserted. Thereby, it is possible to prevent the liquid resin from leaking from the opening of the housing 1110.

JP2015-70634A

In a motor having a casing in which an opening for power feeding is formed, an electrical connection member provided in the opening of the casing may be covered with a cover. In this case, in order to attach the cover to the housing, the cover is screwed to the housing with screws, for example. Specifically, the cover can be attached to the housing by inserting a male screw into a through-hole formed in the cover and screwing the male screw into a female screw formed around the opening of the housing.

The female screw formed in the housing for attaching the cover is a through hole penetrating the housing. For this reason, when the liquid resin is poured into the housing in order to cover the stator core with the resin, the liquid resin may leak from the female screw of the housing. That is, even if the power supply opening formed in the housing is closed with the seal member as in the motor disclosed in Patent Document 1, the problem that the liquid resin leaks from the female screw penetrating the housing remains. ing. In particular, when the thickness of the casing is reduced for the purpose of downsizing the motor, the liquid resin easily flows out from the female screw.

Therefore, it is conceivable that the liquid resin is poured into the housing after the cover is screwed to the housing. However, in this method, the liquid resin enters the gap between the male screw and the female screw, and the male screw is fixed to the female screw when the liquid resin is cured. As a result, the cover cannot be removed.

In addition, by making the female screw a bottomed screw hole that is a non-through hole instead of a through hole, the liquid resin can be prevented from leaking from the female screw. However, according to this method, the thickness of the casing is increased by the amount of the bottom provided in the female screw, which hinders downsizing of the motor.

This indication is made in order to solve such a subject, and even if the penetration internal thread is formed in the case, when the liquid resin flows in the case, the liquid resin leaks from the internal screw. It aims at providing the motor which can suppress this.

In order to achieve the above object, one aspect of the motor according to the present disclosure includes a casing in which one or more internal threads are formed, a stator core disposed in the casing, and at least the stator core and the casing. And a seal member that closes the female screw from the inside of the housing.

Even in a motor having a housing in which a penetrating female screw is formed, the resin can be prevented from leaking from the female screw when the resin is poured into the housing.

FIG. 1 is a cross-sectional view of a motor according to an embodiment. 2 is a cross-sectional view of the motor according to the embodiment taken along line II-II in FIG. 3 is a cross-sectional view of the motor according to the embodiment taken along line III-III in FIG. FIG. 4 is a perspective view when the stator unit according to the embodiment is viewed obliquely from above. FIG. 5 is a perspective view when the stator unit according to the embodiment is viewed obliquely from below. FIG. 6 is an exploded perspective view of the periphery of the electrical connection member of the stator unit according to the embodiment. FIG. 7 is a perspective view showing a state where the stator core is removed from the housing in the stator unit according to the embodiment. FIG. 8 is a perspective view showing a state in which the seal member is further removed from the housing shown in FIG. FIG. 9A is a diagram illustrating a sealing member installation step in the stator unit assembling method according to the embodiment. FIG. 9B is a diagram showing a stator installation step (before stator insertion) in the stator unit assembly method according to the embodiment. FIG. 9C is a diagram showing a stator installation step (after stator insertion) in the stator unit assembly method according to the embodiment. FIG. 9D is a diagram illustrating a resin filling step in the stator unit assembling method according to the embodiment. FIG. 10 is a perspective view showing a sealing member installation step in the stator unit assembling method according to the embodiment. FIG. 11 is a cross-sectional view showing a state when the cover is attached to the housing in the motor according to the embodiment. FIG. 12 is a diagram illustrating the structure of the motor disclosed in Patent Document 1. In FIG.

Hereinafter, embodiments of the present disclosure will be described with reference to the drawings. Note that each of the embodiments described below shows a specific example of the present disclosure. Therefore, the numerical values, shapes, materials, components, component arrangement positions, connection forms, and the like shown in the following embodiments are merely examples and do not limit the present disclosure. Therefore, among the constituent elements in the following embodiments, constituent elements that are not described in the independent claims indicating the highest concept of the present disclosure are described as arbitrary constituent elements.

Each figure is a schematic diagram and is not necessarily shown strictly. Moreover, in each figure, the same code | symbol is attached | subjected to the substantially same structure, The overlapping description is abbreviate | omitted or simplified.

(Embodiment)
First, a schematic configuration of the motor 1 according to the embodiment will be described with reference to FIGS. FIG. 1 is a cross-sectional view of a motor 1 according to an embodiment. FIG. 2 is a sectional view of the motor 1 taken along the line II-II in FIG. 3 is a cross-sectional view of the motor 1 taken along the line III-III in FIG. In FIG. 1 and FIG. 2, the region where the resin 130 exists is indicated by dot-like hatching. In FIG. 3, the structure inside the cover 160 such as the electric wire 170 is omitted.

As shown in FIGS. 1 to 3, the motor 1 includes a stator unit 100, a rotor 200 disposed in the stator unit 100, a shaft 300 provided in the rotor 200, and a first that rotatably holds the shaft 300. A bearing 410 and a second bearing 420 are provided.

The stator unit 100 is a stator assembly in which a stator 120 is incorporated in a housing 110. The stator unit 100 generates a magnetic force for rotating the rotor 200. The stator 120 disposed in the housing 110 has a stator core 121 and a winding coil 122. The detailed configuration of the stator unit 100 will be described later.

The rotor 200 is disposed in the stator unit 100 so as to be rotatable with respect to the stator 120 of the stator unit 100. Specifically, the rotor 200 is disposed inside the stator 120 via a stator core 121 of the stator 120 and a minute air gap. That is, the motor 1 in the present embodiment is an inner rotor type electric motor in which the rotor 200 is disposed inside the stator 120. The rotor 200 is surrounded by the stator core 121 and is rotated by the magnetic force generated by the stator core 121. The rotor 200 has a configuration in which a plurality of N poles and S poles repeatedly exist along the rotation direction. As an example, the rotor 200 is a surface magnet type rotor (SPM rotor) in which a permanent magnet is attached to the surface of a rotor core, but is not limited thereto.

As shown in FIG. 1, the shaft 300 is a rotating shaft fixed to the center of the rotor 200. The rotor 200 rotates about the shaft 300 as a rotation center. The shaft 300 is a metal rod, for example, and penetrates the rotor 200 so as to extend on both sides of the rotor 200. The shaft 300 is fixed to the rotor 200 by, for example, press-fitting or shrink fitting into the center hole of the rotor 200.

The shaft 300 is held by the first bearing 410 and the second bearing 420. As an example, the first bearing 410 and the second bearing 420 are bearings that rotatably support the shaft 300. The first bearing 410 is disposed at the bottom of the casing 110 of the stator unit 100 and is fixed to the casing 110. The second bearing 420 is disposed on the upper part of the housing 110. Specifically, the second bearing 420 is fixed to a bracket 500 attached to the housing 110 so as to cover the opening on the upper side of the housing 110.

Next, a detailed configuration of the stator unit 100 according to the embodiment will be described with reference to FIGS. 4 to 8 with reference to FIGS. FIG. 4 is a perspective view when the stator unit 100 according to the embodiment is viewed obliquely from above, and FIG. 5 is a perspective view when the stator unit 100 is viewed obliquely from below. FIG. 6 is an exploded perspective view of the periphery of the electrical connection member 150 of the stator unit 100. FIG. 7 is a perspective view showing a state where the stator 120 is removed from the casing 110 in the stator unit 100. FIG. 8 is a perspective view showing a state in which the seal member 140 is further removed from the housing 110 shown in FIG. 4 to 8, the resin 130 is omitted.

As shown in FIGS. 4 to 8, the stator unit 100 according to the present embodiment includes a housing 110, a stator 120 disposed in the housing 110, and a seal member 140 provided on the inner surface of the housing 110. And a resin 130 (see FIG. 1) filled between the stator 120 and the housing 110, an electrical connection member 150 attached to the housing 110, and a cover 160 covering the electrical connection member 150. Hereinafter, each component of the stator unit 100 will be described in detail.

The housing 110 is a cylindrical frame (stator frame) that houses the stator 120. The shape of the inner peripheral surface of the housing 110 is a substantially cylindrical outer surface shape. Housing 110 in the present embodiment has a plurality of inner peripheral surfaces with different inner diameters. Specifically, as shown in FIG. 1, the housing 110 includes a first inner peripheral surface 110 a that contacts the outer peripheral surface of the stator core 121 included in the stator 120, and an outer periphery of the stator core 121 with a gap between the outer peripheral surface of the stator core 121. And a second inner peripheral surface 110b facing the surface. That is, the inner diameter of the second inner peripheral surface 110 b is larger than the inner diameter of the first inner peripheral surface 110 a, and the second inner peripheral surface 110 b is the first inner peripheral surface 110 a with respect to the outer peripheral surface of the stator core 121. It has become a more receding surface. Therefore, a step portion is formed at the boundary between the first inner peripheral surface 110a and the second inner peripheral surface 110b. In the present embodiment, the second inner peripheral surface 110 b faces both the stator core 121 and the winding coil 122.

The outer peripheral surface of the housing 110 facing away from the first inner peripheral surface 110a and the outer peripheral surface of the housing 110 facing away from the second inner peripheral surface 110b are flush with each other. Therefore, the portion of the second inner peripheral surface 110b in the housing 110 is thinner (thickness) than the portion of the first inner peripheral surface 110a in the housing 110.

In the present embodiment, the casing 110 is an outer member that forms an outer portion of the stator unit 100. Specifically, the outer shape of the housing 110 has a shape in which four corners of a substantially rectangular shape are recessed when the housing 110 is viewed from above. On the other hand, the inner shape of the housing 110 is substantially circular when the housing 110 is viewed from above. As described above, the housing 110 according to the present embodiment has a different outer shape and inner shape when viewed from above, and the thickness (thickness) is not constant and partially different even in the circumferential direction. ing. Specifically, as shown in FIG. 3 and FIG. 4, the housing 110 has a thick portion 110 c that is thicker than other portions around the recesses at the four corners.

The housing 110 is a rigid body made of a metal material such as an aluminum alloy, for example. Note that the housing 110 is not limited to being made of metal, but may be made of resin. However, from the viewpoint of heat dissipation, the housing 110 is preferably made of a material having high thermal conductivity such as a metal material.

As shown in FIGS. 2 and 6, the housing 110 is formed with a female screw 111 and an opening 112. In the present embodiment, the internal thread 111 and the opening 112 are formed in the upper part of the housing 110. The female screw 111 and the opening 112 are through holes that penetrate the side wall of the housing 110. As shown in FIG. 8, the female screw 111 and the opening 112 are formed at a site where the second inner peripheral surface 110 b of the housing 110 is formed.

As shown in FIG. 6, the opening 112 is an opening window having an approximately rectangular opening shape. The opening area of the opening 112 is larger than the opening area of the female screw 111. As shown in FIGS. 6 and 7, an electrical connection member 150 is attached to the opening 112. That is, the opening 112 is a mounting hole to which the electrical connection member 150 is mounted. In addition, as long as the opening part 112 can provide the electrical connection member 150, the opening shape of the opening part 112 is not restricted to a substantially rectangular shape.

The female thread (female thread) 111 is a screw hole having a thread groove. As shown in FIG. 6, a male screw (male screw) 113 is screwed into the female screw 111. Specifically, the male screw 113 is screwed into the female screw 111 from the outer peripheral surface side of the housing 110. As shown in FIG. 3, when the male screw 113 is screwed into the female screw 111, the tip of the screw shaft of the male screw 113 is located inside the female screw 111. That is, the tip of the screw shaft of the male screw 113 does not protrude from the inner peripheral surface of the housing 110 into the internal space of the housing 110.

At least one female screw 111 is formed. In the present embodiment, a plurality of female screws 111 are formed. Specifically, as shown in FIG. 6, five internal threads 111 are formed. The five female screws 111 are formed around the opening 112. Specifically, as the internal thread 111, four first internal threads 111a provided around the four corners of the opening 112 and one second internal thread 111b formed immediately below the lower side of the opening 112 are formed. Yes.

A plurality of male screws 113 are used according to the number of female screws 111. In the present embodiment, since five female screws 111 are formed, five male screws 113 are used. Specifically, as shown in FIGS. 4 to 6, as the male screw 113, four first male screws 113a screwed into the four first female screws 111a and second male screws 113b screwed into the one second female screw 111b. (See FIG. 6).

The first female screw 111a and the first male screw 113a are used when the cover 160 that covers the electrical connection member 150 is fixed to the housing 110. Specifically, the first male screw 113a is inserted into each of four through holes 160a (see FIG. 3) formed in the cover 160, and each of the four first male screws 113a is screwed into the four first female screws 111a. Thus, the cover 160 can be fixed to the outer surface of the housing 110. Thus, the first female screw 111a is a cover mounting screw hole, and the first male screw 113a is a cover mounting screw.

Further, the first female screw 111 a is formed in the thick part 110 c of the housing 110. As a result, even if the first female screw 111a is formed in a portion where the thickness of the housing 110 is reduced (a portion of the second inner peripheral surface 110b), the first male screw 113a is used as the axial length of the first female screw 111a. It is possible to secure a sufficient length for inserting the entire screw shaft. Therefore, since the length of the screw shaft of the first male screw 113a can be increased, the cover 160 can be securely fixed to the housing 110.

On the other hand, the second female screw 111b and the second male screw 113b shown in FIG. 6 are part of the ground path. Although not shown, for example, the ground wire can be electrically connected to the metal housing 110 by sandwiching the ground wire between the screw head of the second male screw 113b and the outer peripheral surface of the housing 110. . Thereby, the metal casing 110 can be grounded by the ground wire. Thus, the second female screw 111b is a ground connection screw hole, and the second male screw 113b is a ground connection screw. Note that the second male screw 113b screwed into the second female screw 111b is covered with a cover 160 together with the ground wire as shown in FIG. The ground wire is drawn out from the cover 160 to the outside.

As shown in FIGS. 3, 4 and 7, the stator 120 is disposed in the casing 110 configured as described above. The stator 120 includes a stator core 121, a winding coil 122, and an insulator 123.

The stator core 121 is an annular iron core that generates a magnetic force for rotating the rotor 200. The stator core 121 is, for example, a laminated body in which a plurality of electromagnetic steel plates are laminated in the axial direction of the shaft 300, but is not limited thereto, and may be a bulk body made of a magnetic material.

The winding coil 122 is a stator coil wound around the stator core 121 via the insulator 123. Specifically, as shown in FIG. 3, the winding coil 122 is wound around each of the plurality of teeth 121 a of the stator core 121. In the present embodiment, the winding coil 122 is constituted by a plurality of unit coils of three phases of U phase, V phase, and W phase. The plurality of winding coils 122 are connected by a winding connection portion 124 (see FIG. 1). For example, the winding connection part 124 includes a printed wiring board on which pattern wirings for electrically connecting a plurality of winding coils 122 are formed for every three phases of the U phase, the V phase, and the W phase. In this case, the end of each winding coil 122 is electrically connected to the pattern wiring of the printed wiring board by solder or the like. In addition, the printed wiring board has an opening through which the shaft 300 is freely circulated at the center, and has, for example, an annular shape (a donut shape), a fan shape (an arc shape), or a C shape.

The insulator 123 is an insulating frame that covers the stator core 121. Specifically, the insulator 123 covers the teeth 121a of the stator core 121, and is provided for each tooth 121a.

The stator 120 configured in this way is fixed to the casing 110. In the present embodiment, stator core 121 around which winding coil 122 is wound through insulator 123 is fixed to metal casing 110 by shrink fitting. Therefore, as shown in FIG. 1, the stator core 121 is sandwiched between the inner peripheral surfaces of the housing 110. That is, the outer peripheral surface of the stator core 121 is in contact with the inner peripheral surface of the housing 110. Specifically, the first inner peripheral surface 110a of the stator core 121 and the outer peripheral surface of the stator core 121 are in surface contact so as to be in close contact with each other.

As shown in FIGS. 1 and 2, a resin 130 is provided in the housing 110. The resin 130 is filled at least between the stator core 121 included in the stator 120 and the housing 110. Specifically, the resin 130 is provided so as to fill a gap space between the outer surface of the stator core 121 and the inner surface of the housing 110. For example, the resin 130 is a gap space between the casing 110 and the stator core 121 excluding a portion where the inner peripheral surface of the casing 110 and the outer peripheral surface of the stator core 121 are in close contact, the bottom surface of the casing 110, the stator core 121 and the winding. A gap space between the wire coils 122 and a gap space between two adjacent winding coils 122 are filled. In the present embodiment, the resin 130 is molded so as to cover almost the entire stator 120 disposed in the housing 110. Therefore, the surfaces of the stator core 121 and the winding coil 122 are formed of the resin 130. As shown in FIG. 1, the resin 130 is filled from the top of the stator 120 to the bottom 110 d of the housing 110.

The resin 130 can be filled in a gap space between the stator core 121 and the casing 110 by pouring a liquid resin into the casing 110 and solidifying the resin. Specifically, as the resin 130, a thermosetting resin such as a polyester resin or an epoxy resin can be used. In this case, the resin 130 can be filled in the gap space between the stator core 121 and the casing 110 by pouring a liquid thermosetting resin into the casing 110 and heating or drying to cure. In addition, in order to improve the heat dissipation of the resin 130, an additive made of an inorganic material having a high thermal conductivity may be mixed in the resin 130.

Further, as shown in FIGS. 1 to 3, a seal member 140 is provided on the casing 110. The seal member 140 is used to prevent the liquid resin from leaking from the female screw 111 when the liquid resin is poured into the housing 110 in order to mold the resin 130. Therefore, the seal member 140 closes the female screw 111 from the inside of the housing 110. In the present embodiment, the seal member 140 is a thin plate-like and strip-like adhesive tape having a laminated structure of a base material layer and an adhesive layer, and is adhered along the inner surface of the housing 110. As the sealing member 140, for example, a resin adhesive tape having a base material layer as a resin film can be used. Thereby, the seal member 140 can be easily fixed to the housing 110.

The seal member 140 may be transparent. By using the transparent seal member 140, the inside of the housing 110 can be visually observed through the seal member 140 and the female screw 111. Thereby, it can be confirmed that the resin 130 in the housing 110 exists up to the position of the female screw 111 covered with the seal member 140.

Also, the seal member 140 may be able to withstand the temperature when the liquid resin is cured and the resin 130 is molded. In particular, when the stator core 121 is fixed to the housing 110 by shrink fitting, a seal member 140 having excellent heat resistance may be used. For example, the sealing member 140 may have heat resistance that can withstand a temperature of about 250 ° C.

In the present embodiment, a transparent sealing member 140 having excellent heat resistance and being transparent is used. Specifically, a transparent resin adhesive tape having a base material layer made of a polyimide resin film having a heat resistance of 250 ° C. or higher is used as the seal member 140.

The seal member 140 is not limited to a resin adhesive tape, and may be a metal adhesive tape having a metal film (metal foil) as a base material layer. In this case, as a metal adhesive tape, the aluminum foil adhesive tape which uses aluminum foil as a base material layer can be used. Since the metal adhesive tape is also excellent in heat resistance, a metal adhesive tape may be used as the seal member 140 when the stator core 121 is fixed to the housing 110 by shrink fitting.

In the present embodiment, the internal thread 111 that is closed by the seal member 140 is provided on the second inner peripheral surface 110b of the housing 110. Therefore, as shown in FIGS. 7 and 8, the seal member 140 is provided on the second inner peripheral surface 110 b of the housing 110. In this case, the gap between the second inner peripheral surface 110 b and the stator core 121 is larger than the thickness of the seal member 140. That is, the level difference between the first inner peripheral surface 110 a and the second inner peripheral surface 110 b is larger than the thickness of the seal member 140. Therefore, the seal member 140 is accommodated in a space region between the second inner peripheral surface 110 b and the outer peripheral surface of the stator core 121 without contacting the stator core 121.

Further, the sealing member 140 collectively blocks a plurality of female screws 111 provided around the opening 112. In the present embodiment, the seal member 140 includes three female screws 111 including two first female screws 111a positioned below the four first female screws 111a for attaching the cover and a second female screw 111b for ground connection. Are closed together. As described above, the plurality of female screws 111 can be easily blocked by the single sealing member 140 by closing the plurality of female screws 111 together by the sealing member 140.

As shown in FIG. 1, electric power for energizing a winding coil 122 wound around a stator core 121 included in the stator 120 is supplied to the electrical connection member 150 attached to the opening 112. Specifically, as shown in FIG. 1, when the electric wire 170 is connected to the electric connecting member 150, the electric connecting member 150 is connected to the three phases of the U phase, the V phase, and the W phase via the electric wire 170. AC is supplied.

The electrical connection member 150 is electrically connected to the winding coil 122 via the winding connection portion 124. Specifically, the electrical connection member 150 is electrically connected to the pattern wiring of the printed wiring board of the winding connection part 124. As described above, in the winding connection part 124, a plurality of winding coils 122 are connected. Therefore, the electric power supplied to the electrical connection member 150 is supplied to each winding coil 122 via the printed wiring board of the winding connection portion 124.

In the present embodiment, the electrical connection member 150 is a connector terminal. Specifically, as shown in FIG. 6, the electrical connection member 150 includes a plurality of conductive connector pins 151 and a holder 152 made of an insulating resin material that holds the plurality of connector pins 151. More specifically, since the electrical connection member 150 is a female socket type connector terminal, the holder 152 has an opening frame 152 a surrounding the connector pin 151. As shown in FIG. 1, a male socket 171 provided at the tip of the electric wire 170 is inserted into the opening frame 152 a of the holder 152. Thereby, the electric wire 170 and the electric connection member 150 can be electrically and mechanically connected by inserting the male socket 171 of the electric wire 170 into the holder 152 of the electric connection member 150. The electric wire 170 and the electrical connecting member 150 are detachable.

As shown in FIGS. 1 and 6, the holder 152 of the electrical connection member 150 further includes a bottom plate portion 152b, a fitting portion 152c, and a through hole 152d.

The bottom plate portion 152 b closes the opening 112 of the housing 110. The outer peripheral end portion of the bottom plate portion 152b is formed in a flange shape so as to protrude outward from the opening frame 152a.

The fitting portion 152 c is provided on the casing 110 side of the bottom plate portion 152 b and has a shape that is fitted into the opening 112. Therefore, the external shape of the fitting portion 152 c is the same as the opening shape of the opening portion 112. If the electrical connection member 150 can be attached to the opening 112, the fitting length of the fitting part 152c may be equal to or less than the thickness of the housing 110 in the opening 112.

The through-hole 152d is formed in a part of the holder 152. As shown in FIG. 6, the second male screw 113b for ground connection is inserted through the through hole 152d. The through hole 152d is formed at a position overlapping the second female screw 111b formed in the housing 110.

The electrical connection member 150 configured in this manner is provided so as to close the opening 112 of the housing 110.

In this embodiment, the opening portion 112 is closed by fitting the holder 152 included in the electrical connection member 150 into the opening portion 112. Therefore, the opening 112 is blocked by the holder 152. Specifically, the electrical connection member 150 is fixed to the housing 110 when the second male screw 113b is screwed into the second female screw 111b when the housing 110 is grounded. In this case, the fitting portion 152c of the holder 152 is fitted into the opening 112 of the housing 110, and the second male screw 113b is inserted into the through hole 152d and screwed into the second female screw 111b. 110 can be fixed.

As shown in FIGS. 1 to 6, the electrical connection member 150 is covered with a cover 160. Specifically, a part of the electrical connection member 150 fitted in the opening 112 protrudes outward from the opening 112 of the housing 110, and the cover 160 covers the electrical connection member 150 protruding from the opening 112. Are arranged as follows. In the present embodiment, cover 160 is attached to housing 110 so as to hide electrical connection member 150.

As shown in FIG. 6, the cover 160 is fixed to the housing 110 with a male screw 113. Therefore, as shown in FIG. 3, the cover 160 is formed with a through hole 160a through which the male screw 113 is inserted. Specifically, the first male screw 113a of the first male screw 113a and the second male screw 113b is inserted into the through hole 160a. The cover 160 is fixed to the housing 110 by the first male screw 113a inserted through the through hole 160a being screwed into the first female screw 111a. The cover 160 is made of, for example, an insulating resin material.

Next, a method for assembling the stator unit 100 will be described with reference to FIGS. 9A to 9D. 9A to 9D are views for explaining an assembly method of the stator unit 100 according to the embodiment. 9A to 9D, (a) is a cross-sectional view taken along a plane passing through the axis of the housing 110, and (b) is a cross-sectional view taken along the line AA in (a). FIG.

As shown in FIG. 9A, first, the seal member 140 is fixed to the casing 110 so as to close the female screw 111 formed in the casing 110. Specifically, the seal member 140 is attached to the inner peripheral surface of the housing 110 so as to close the female screw 111.

In this embodiment, as shown in FIGS. 10A and 10B, the female screw 111 provided at the site of the second inner peripheral surface 110 b of the housing 110 is closed with the seal member 140. Specifically, the seal member 140 includes three female screws 111 including two first female screws 111a located below the four first female screws 111a for attaching the cover and a second female screw 111b for ground connection. It is plugged together.

Next, as shown in FIG. 9B, the stator 120 to which the winding coil 122 is connected at the winding connection portion 124 is inserted into the casing 110, and the stator 120 is inserted into the casing 110 as shown in FIG. 9C. Deploy.

At this time, as shown in FIG. 9B, the seal member 140 is fixed to the second inner peripheral surface 110 b of the housing 110. In other words, the seal member 140 is fixed to the second inner peripheral surface 110b, which is a surface retreated from the first inner peripheral surface 110a. In the present embodiment, the step d indicating the thickness of the step portion located between the first inner peripheral surface 110 a and the second inner peripheral surface 110 b is larger than the thickness of the seal member 140. Therefore, even if the sealing member 140 is attached to the inner surface of the casing 110 and the inner diameter of the casing 110 is reduced by the thickness of the sealing member 140, as shown in FIG. 9C, the stator 120 (stator core 121) The stator 120 can be inserted into the casing 110 without contacting the seal member 140. Thereby, when inserting the stator 120 in the housing | casing 110, it can suppress that the sealing member 140 will be stripped off by the stator 120. FIG. That is, the seal member 140 does not get in the way when the stator 120 is inserted.

In the present embodiment, the stator 120 is fixed to the metal casing 110 by shrink fitting. Specifically, before inserting the stator 120 into the housing 110, the metal housing 110 is heated to expand the housing 110 to increase the inner diameter of the housing 110, and then the stator 120 is attached to the housing 110. The housing 110 is cooled by inserting it into the housing. As a result, the stator core 121 of the stator 120 is sandwiched between the inner peripheral surfaces of the casing 110 and the stator 120 is fixed to the casing 110.

Note that the method of fixing the stator 120 to the housing 110 is not limited to shrink fitting, and may be press-fitting or adhesion.

Next, as shown in FIG. 9D, a cored bar 600 (jig) having a diameter substantially the same as the inner diameter of the stator core 121 is arranged in the casing 110, and liquid is formed in a space region surrounded by the casing 110 and the cored bar 600. The resin 130A is poured to fill the gap space in the housing 110 with the liquid resin 130A. For example, the liquid resin 130 </ b> A is injected into the casing 110 up to the vicinity of the top of the stator 120.

At this time, in the present embodiment, the female screw 111 existing up to the height position where the liquid resin 130A is filled is closed by the seal member 140. Accordingly, it is possible to prevent the liquid resin 130A from leaking out of the female screw 111 when the liquid resin 130A is poured into the housing 110.

In this embodiment, a transparent member is used as the seal member 140. Accordingly, since the inside of the housing 110 can be visually observed through the seal member 140 and the female screw 111, it can be confirmed that the liquid resin 130A is filled up to the position of the female screw 111 covered with the seal member 140. it can.

The liquid resin 130A is not injected up to the position of the opening 112 formed in the housing 110. That is, the upper limit position where the liquid resin 130 </ b> A is injected is below the opening 112. Thereby, it is possible to prevent the liquid resin 130 </ b> A from leaking from the opening 112.

Thereafter, the resin 130 (see FIG. 1) filled in the gap space in the housing 110 can be molded by heating and curing the liquid resin 130A.

Thereby, the stator unit 100 in which the stator 120 arranged in the casing 110 is covered with the resin 130 can be manufactured.

After that, as shown in FIG. 11, the electrical connection member 150 is fixed to the housing 110, and the housing 110 is grounded by the second male screw 113b. Next, the first bearing 410, the rotor 200 to which the shaft 300 is fixed, and the bracket 500 to which the second bearing 420 is fixed are sequentially arranged and fixed to the stator unit 100. Next, the electric wire 170 is connected to the electric connecting member 150 and the cover 160 is fixed to the housing 110 by the first male screw 113a. Thereby, the motor 1 shown in FIG. 1 is completed.

As described above, according to the motor 1 in the present embodiment, the penetrating female screw 111 is formed in the housing 110, but the female screw 111 is closed from the inside of the housing 110 by the seal member 140. Therefore, it is possible to prevent the liquid resin 130A from leaking from the female screw 111 when the liquid resin 130A is poured into the housing 110 in order to cover the stator core 121 with the resin 130.

And in the motor 1 in the present embodiment, since the resin 130 is formed in the casing 110 in which the stator 120 is disposed, the heat dissipation is excellent. Therefore, a small motor 1 can be realized.

(Modification)
While the motor and the like according to the present disclosure have been described based on the embodiments, the present disclosure is not limited to the above embodiments.

For example, in the above embodiment, an adhesive tape is used as the seal member 140, but the present invention is not limited to this. That is, the method of fixing the seal member 140 to the housing 110 is not limited to adhesion, and the seal member 140 itself may not have an adhesive layer (adhesive). Specifically, when the seal member 140 is a metal tape, the seal member 140 may be fixed to the housing 110 by welding. Alternatively, when the seal member 140 is a non-adhesive tape or the like that does not have an adhesive layer, the seal member 140 may be fixed to the casing 110 by another fixing member having an adhesive layer or the like.

Moreover, in the said embodiment, although the 1st internal thread 111a for attaching the cover 160 and the 2nd internal thread 111b for grounding the housing | casing 110 were illustrated as the internal thread 111 formed in the housing | casing 110, Not limited to this. The female screw 111 formed in the housing 110 may be a screw hole for attaching a cooling fan to the housing 110, or may be a screw hole for attaching the motor 1 to another member.

In the above embodiment, the electrical connection member 150 is a connector terminal, but is not limited thereto. For example, the electrical connection member 150 may be a lead wire (lead wire) connected to the printed wiring board of the winding connection portion 124. In this case, it is preferable to provide a separate sealing member so as to close the opening 112 of the housing 110 and to provide an insertion hole through which the lead wire is inserted.

In the above embodiment, the tip of the screw shaft of the male screw 113 to be screwed into the female screw 111 is located inside the female screw 111 and is not in contact with the seal member 140, but is not limited thereto. For example, the tip of the screw shaft of the male screw 113 may be in contact with the seal member 140, or the tip of the screw shaft of the male screw 113 may break through the seal member 140.

In addition, it is realized by arbitrarily combining the components and functions in the above-described embodiment without departing from the scope of the present disclosure, or the form obtained by making various modifications conceived by those skilled in the art to the above-described embodiment. Forms are also included in the present disclosure.

The technology of the present disclosure is useful for a small motor and an electric device including the motor.

DESCRIPTION OF

SYMBOLS

1,1001 Motor 100

Stator unit

110, 1110 Housing | casing 110a 1st internal peripheral surface 110b 2nd internal peripheral surface 110c Thick part 110d Bottom part 111 Female screw 111a 1st female screw 111b 2nd

female screw

112, 1112 Opening part 113 Male screw 113a 1st Male screw 113b Second male screw 120 Stator 121 Stator core 121a Teeth 122 Winding coil 123 Insulator 124 Winding connection part 130 Resin

130A Liquid resin

140, 1140 Seal member 150 Electrical connection member 151 Connector pin 152 Holder 152a Open frame 152b Bottom plate part 152c Fitting part 152d Through-hole 160 Cover 160a Through-hole 170 Electric wire 171 Male socket 200 Rotor 300 Shaft 410 First bearing 420 Second bearing 500 Racket 600 metal core 1141 through hole 1150 lead wire

Claims

A housing formed with one or more penetrating internal threads;
A stator core disposed in the housing;
At least a resin filled between the stator core and the housing;
A sealing member for closing the female screw from the inside of the housing;
motor.
The seal member is a strip-shaped adhesive tape, and is adhered along the inner surface of the housing.
The motor according to claim 1.
The sealing member is transparent;
The motor according to claim 2.
The base material layer of the sealing member is composed of a polyimide resin film.
The motor according to claim 2 or 3.
The base material layer of the sealing member is constituted by a metal film,
The motor according to claim 2.
The housing includes a first inner peripheral surface that contacts the outer peripheral surface of the stator core, and a second inner peripheral surface that faces the outer peripheral surface of the stator core with a gap from the outer peripheral surface of the stator core,
The female screw to be closed by the seal member is provided on the second inner peripheral surface,
The gap is larger than the thickness of the seal member,
The motor according to any one of claims 1 to 5.
A plurality of the female screws are formed,
The motor according to any one of claims 1 to 6.
The housing has an opening to which an electrical connection member to which power for energizing a winding coil wound around the stator core is supplied is attached.
And a cover for covering the electrical connection member,
One of the female screws is a first female screw into which a first male screw is screwed,
The cover is fixed to the housing by the first male screw inserted into a through-hole formed in the cover being screwed into the first female screw.
The motor according to claim 7.
One of the female threads is a second female thread that is part of the ground path.
The motor according to claim 7 or 8.
The seal member collectively blocks a plurality of the female screws.
The motor according to any one of claims 6 to 9.