CN111903041A

CN111903041A - Electric motor

Info

Publication number: CN111903041A
Application number: CN201880091658.4A
Authority: CN
Inventors: 森冈正之; 大畑贵央; 麻生宜农
Original assignee: Panasonic Intellectual Property Management Co Ltd
Current assignee: Panasonic Intellectual Property Management Co Ltd
Priority date: 2018-03-27
Filing date: 2018-11-28
Publication date: 2020-11-06
Anticipated expiration: 2038-11-28
Also published as: JP7281717B2; CN111903041B; JPWO2019187336A1; WO2019187336A1

Abstract

The motor includes: a housing (110) in which at least 1 penetrating female screw portion (111) is formed; a stator core (121) disposed within the housing (110); a resin (130) that is filled at least between the stator core (121) and the housing (110); and a sealing member (140) that closes the internal thread portion (111) from the inside of the housing (110).

Description

Electric motor

Technical Field

The present disclosure relates to an electric motor.

Background

Conventionally, in a motor in which a stator core is disposed in a case, a structure is known in which the stator core is covered with a resin by allowing a liquid resin to flow into an internal space of the case and curing the resin. In such a motor, since the resin is embedded between the stator core and the housing, heat generated in the motor can be efficiently dissipated. This makes it possible to reduce the size of the motor.

In the motor in which the stator core is disposed in the case, an opening for feeding power is formed in the case, and a connection member such as a lead wire or a connector is provided in the opening, in order to energize a winding coil wound around the stator core. This allows the electric power to be supplied to the motor via the electric connection member, thereby allowing the winding coil wound around the stator core to be energized.

However, if the opening is formed in the housing, the liquid resin may leak from the opening of the housing when the liquid resin flows into the internal space of the housing to cover the stator core with the resin.

In view of this, conventionally, a motor capable of preventing liquid resin from leaking from an opening of a housing has been proposed (patent document 1). Fig. 12 is a perspective view showing the structure of motor 1001 disclosed in patent document 1. As shown in fig. 12, in the motor 1001 disclosed in patent document 1, a seal member 1140 made of urethane rubber or the like is fitted into an opening 1112 of a housing 1110, and lead wires 1150 are inserted into small-diameter through-holes 1141 provided in the seal member 1140. This can prevent the liquid resin from leaking from the opening of the case 1110.

Documents of the prior art

Patent document

Patent document 1: japanese patent laid-open publication No. 2015-70634

Disclosure of Invention

Problems to be solved by the invention

In a motor having a housing formed with an opening for power supply, an electrical connection member provided in the opening of the housing 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 the male screw into a through hole formed in the cover and screwing the male screw into a female screw portion formed around the opening of the housing.

The female screw portion formed in the housing for attaching the cover is a through hole penetrating the housing. Therefore, when the liquid resin is poured into the case to cover the stator core with the resin, the liquid resin may leak from the female screw portion of the case. That is, even if the opening for power supply formed in the case is closed by the sealing member as in the motor disclosed in patent document 1, there is a problem that the liquid resin leaks from the female screw portion penetrating the case. In particular, when the thickness of the housing is reduced for the purpose of downsizing the motor, the liquid resin easily flows out of the female screw portion.

Then, it is considered that the liquid resin is poured into the housing after the cap 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 detached.

Further, by providing the female screw portion with a bottomed screw hole as a non-through hole instead of a through hole, leakage of the liquid resin from the female screw portion can be prevented. However, in this method, the thickness of the case is increased by the thickness corresponding to the bottom of the female screw portion, which hinders the miniaturization of the motor.

The present disclosure has been made to solve the above problems, and an object of the present disclosure is to provide a motor including: even if the housing is formed with a through female screw portion, the liquid resin can be prevented from leaking out of the female screw portion when the liquid resin is introduced into the housing.

Means for solving the problems

In order to achieve the above object, one aspect of the motor of the present disclosure includes: a housing having 1 or more through female screw portions formed therein; a stator core disposed within the housing; a resin filled at least between the stator core and the housing; and a sealing member that closes the internal thread portion from an inner side of the housing.

ADVANTAGEOUS EFFECTS OF INVENTION

Even in the case of the motor having the housing in which the female screw portion is formed to penetrate, it is possible to suppress the resin from leaking from the female screw portion when the resin is caused to flow into the housing.

Drawings

Fig. 1 is a sectional view of a motor of an embodiment.

Fig. 2 is a sectional view of the motor of the embodiment taken along line II-II of fig. 1.

Fig. 3 is a sectional view of the motor of the embodiment taken along the line III-III of fig. 1.

Fig. 4 is a perspective view of the stator unit of the embodiment viewed from obliquely above.

Fig. 5 is a perspective view of the stator unit of the embodiment as viewed obliquely from below.

Fig. 6 is an exploded perspective view of the periphery of an electrical connection member of the stator unit of the embodiment.

Fig. 7 is a perspective view showing a state in which 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 where the sealing member is further removed from the housing shown in fig. 7.

Fig. 9A is a diagram illustrating a sealing member installation step in the stator unit assembly method according to the embodiment.

Fig. 9B is a view showing a stator installation step (before stator insertion) in the method of assembling the stator unit according to the embodiment.

Fig. 9C is a view showing a stator installation step (after stator insertion) in the method of assembling the stator unit according to the embodiment.

Fig. 9D is a diagram illustrating a resin filling process of 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 assembly method according to the embodiment.

Fig. 11 is a sectional view showing a state in which the cover is attached to the housing in the motor of the embodiment.

Fig. 12 is a diagram showing a structure of the motor disclosed in patent document 1.

Detailed Description

Hereinafter, embodiments of the present disclosure will be described with reference to the drawings. The embodiments described below are all specific examples of the present disclosure. Therefore, the numerical values, shapes, materials, constituent elements, arrangement positions and connection forms of the constituent elements, and the like shown in the following embodiments are examples, and the present disclosure is not limited thereto. Therefore, among the components of the following embodiments, components not described in the independent claims representing the uppermost concept of the present disclosure will be described as arbitrary components.

The drawings are schematic and not necessarily strictly shown. In the drawings, substantially the same components are denoted by the same reference numerals, and redundant description is omitted or simplified.

(embodiment mode)

First, a schematic configuration of the motor 1 according to the embodiment will be described with reference to fig. 1 to 3. Fig. 1 is a sectional view of a motor 1 of the embodiment. Fig. 2 is a sectional view of the motor 1 taken along line II-II of fig. 1. Fig. 3 is a sectional view of the motor 1 taken along the line III-III of fig. 1. In fig. 1 and 2, the region where the resin 130 is present is indicated by a dotted hatching. In fig. 3, the structure inside the cover 160 such as the wire 170 is omitted.

As shown in fig. 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 1 st bearing 410 and a 2 nd bearing 420 that rotatably hold the shaft 300.

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. Stator 120 disposed in case 110 includes stator core 121 and winding coil 122. The detailed structure 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 with a small air gap from the stator core 121 of the stator 120. That is, the motor 1 of the present embodiment is an inner rotor type motor in which the rotor 200 is disposed inside the stator 120. The rotor 200 is surrounded by the stator core 121 and rotates by magnetic force generated by the stator core 121. The rotor 200 has a structure in which a plurality of N poles and S poles are repeatedly present along the rotation direction. The rotor 200 is, for example, a surface magnet type rotor (SPM rotor) in which a permanent magnet is attached to a 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, for example, a metal rod, and penetrates the rotor 200 so as to extend to both sides of the rotor 200. The shaft 300 is fixed to the rotor 200 by being press-fitted or heat-fitted into a center hole of the rotor 200, for example.

The shaft 300 is held by a 1 st bearing 410 and a 2 nd bearing 420. For example, the 1 st bearing 410 and the 2 nd bearing 420 are bearings that support the shaft 300 to be rotatable. The 1 st bearing 410 is disposed at the bottom of the housing 110 of the stator unit 100 and fixed to the housing 110. The 2 nd bearing 420 is disposed at an upper portion of the housing 110. Specifically, the 2 nd bearing 420 is fixed to the bracket 500, and the bracket 500 is 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 fig. 1 to 3 and with reference to fig. 4 to 8. Fig. 4 is a perspective view of the stator unit 100 according to the embodiment when viewed from obliquely above, and fig. 5 is a perspective view of the stator unit 100 when viewed from obliquely 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 in which the stator 120 is removed from the housing 110 in the stator unit 100. Fig. 8 is a perspective view showing a state where the sealing member 140 is further removed from the housing 110 shown in fig. 7. In fig. 4 to 8, the resin 130 is omitted.

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

The housing 110 is a cylindrical housing (stator housing) that houses the stator 120. The inner peripheral surface of the housing 110 has a substantially cylindrical outer surface shape. The housing 110 of the present embodiment has a plurality of inner circumferential surfaces having different inner diameters. Specifically, as shown in fig. 1, the housing 110 has a 1 st inner peripheral surface 110a that contacts the outer peripheral surface of a stator core 121 of the stator 120, and a 2 nd inner peripheral surface 110b that faces the outer peripheral surface of the stator core 121 with a gap therebetween. That is, the inner diameter of the 2 nd inner peripheral surface 110b is larger than the inner diameter of the 1 st inner peripheral surface 110a, and the 2 nd inner peripheral surface 110b is a surface receding from the 1 st inner peripheral surface 110a with respect to the outer peripheral surface of the stator core 121. Therefore, a step portion is formed at the boundary between the 1 st inner peripheral surface 110a and the 2 nd inner peripheral surface 110 b. In the present embodiment, the 2 nd inner peripheral surface 110b faces both the stator core 121 and the winding coil 122.

Further, the outer peripheral surface of the case 110 facing away from the 1 st inner peripheral surface 110a is flush with the outer peripheral surface of the case 110 facing away from the 2 nd inner peripheral surface 110 b. Therefore, the thickness (thickness) of the 2 nd inner peripheral surface 110b of the housing 110 is smaller than the thickness (thickness) of the 1 st inner peripheral surface 110a of the housing 110.

In the present embodiment, the housing 110 is a contour member that forms the contour of the stator unit 100. Specifically, in a plan view of case 110, case 110 has a shape in which 4 substantially rectangular corners are recessed. On the other hand, the housing 110 is formed in a substantially circular shape when the housing 110 is viewed in plan. As described above, the outer shape and the inner shape of the case 110 of the present embodiment are different from each other in a plan view, and the thickness (wall thickness) is not constant but partially different from each other in a circumferential direction. Specifically, as shown in fig. 3 and 4, the case 110 has a thick portion 110c having a thickness larger than other portions around the recessed portions at the four corners.

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

As shown in fig. 2 and 6, a female screw portion 111 and an opening 112 are formed in the housing 110. In the present embodiment, the female screw portion 111 and the opening 112 are formed in the upper portion of the housing 110. The female screw portion 111 and the opening portion 112 are through holes penetrating the side wall of the housing 110. As shown in fig. 8, the female screw portion 111 and the opening 112 are formed in the case 110 at a portion where the 2 nd inner peripheral surface 110b is formed.

As shown in fig. 6, the opening 112 is an opening window having a substantially rectangular opening shape. The opening area of the opening 112 is larger than the opening area of the female screw portion 111. As shown in fig. 6 and 7, an electrical connection member 150 is attached to the opening 112. That is, the opening 112 is a mounting hole for mounting the power supply connection member 150. The opening 112 is not limited to a substantially rectangular shape as long as the electrical connection member 150 can be provided.

The female (female) thread portion 111 is a threaded hole having a thread groove. As shown in fig. 6, a male screw (male screw) 113 is screwed into the female screw portion 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, in a state where the male screw 113 is screwed into the female screw 111, the tip of the screw of the male screw 113 is positioned inside the female screw 111. That is, the tip of the screw of the male screw 113 does not protrude from the inner circumferential surface of the housing 110 into the inner space of the housing 110.

At least 1 female screw portion 111 is formed. In the present embodiment, a plurality of female screw portions 111 are formed. Specifically, as shown in fig. 6, 5 female screw portions 111 are formed. The 5 female screw portions 111 are formed around the opening 112. Specifically, as the female screw portion 111, 41 st female screw portions 111a provided around four corners of the opening 112 and 12 nd female screw portion 111b formed slightly below the lower edge of the opening 112 are formed.

The male screw 113 is used in a plurality corresponding to the number of the female screw portions 111. In the present embodiment, since 5 female screw portions 111 are formed, 5 male screws 113 are used. Specifically, as shown in fig. 4 to 6, 41 st male screws 113a screwed into 41 st female screw portions 111a and a 2 nd male screw 113b screwed into 12 nd female screw portion 111b (see fig. 6) are used as the male screws 113.

The 1 st female screw portion 111a and the 1 st male screw 113a are used when the cover 160 covering the electrical connection member 150 is fixed to the housing 110. Specifically, the cover 160 can be fixed to the outer surface of the housing 110 by inserting the 1 st male screw 113a into each of the 4 through holes 160a (see fig. 3) formed in the cover 160 and screwing the 41 st male screws 113a into the 41 st female screw portions 111 a. Thus, the 1 st female screw portion 111a is a cover attachment screw hole, and the 1 st male screw 113a is a cover attachment screw.

The 1 st female screw portion 111a is formed in the thick portion 110c of the case 110. Thus, even if the 1 st female screw portion 111a is formed at a portion (the 2 nd inner circumferential surface 110b portion) of the housing 110 where the thickness is small, a sufficient length corresponding to the length of the 1 st male screw 113a into which the entire screw is inserted can be secured as the axial length of the 1 st female screw portion 111 a. Therefore, the length of the screw of the 1 st male screw 113a can be made long, and therefore the cover 160 can be reliably fixed to the housing 110.

On the other hand, the 2 nd female screw portion 111b and the 2 nd male screw 113b shown in fig. 6 become 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 2 nd male screw 113b and the outer peripheral surface of the housing 110. This allows the metal case 110 to be grounded by a ground wire. In this way, the 2 nd female screw portion 111b is a ground connection screw hole, and the 2 nd male screw 113b is a ground connection screw. As shown in fig. 2, the 2 nd male screw 113b screwed into the 2 nd female screw 111b is covered with the cover 160 together with the ground wire. The ground wire is led out from the cover 160 to the outside.

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

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

Winding coil 122 is a stator coil wound around stator core 121 with insulator 123 interposed therebetween. Specifically, as shown in fig. 3, winding coil 122 is wound around each of a plurality of teeth 121a of stator core 121. In the present embodiment, the winding coil 122 is formed of a plurality of unit coils of three phases, i.e., U-phase, V-phase, and W-phase. The plurality of winding coils 122 are connected to a winding connection portion 124 (see fig. 1). The winding wire connecting portion 124 has a printed wiring board on which pattern wiring for electrically connecting the plurality of winding coils 122 is formed for each of three phases, i.e., a U-phase, a V-phase, and a W-phase. In this case, the ends of the respective winding coils 122 are electrically connected to the pattern wiring of the printed wiring board by soldering or the like. The printed wiring board has an opening in the center through which the shaft 300 loosely passes, and is, for example, annular (ring-shaped), fan-shaped (arc-shaped), or C-shaped.

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

The stator 120 thus constructed is fixed to the housing 110. In the present embodiment, stator core 121 around which winding coil 122 is wound with insulator 123 interposed therebetween is fixed to metal case 110 by shrink fitting. Thus, as shown in fig. 1, stator core 121 is sandwiched by the inner circumferential surface of case 110. That is, the outer circumferential surface of the stator core 121 contacts the inner circumferential surface of the case 110. Specifically, the 1 st inner circumferential surface 110a of the stator core 121 and the outer circumferential surface of the stator core 121 are in close surface contact with each other.

As shown in fig. 1 and 2, a resin 130 is provided in the case 110. Resin 130 is filled at least between stator core 121 of stator 120 and case 110. Specifically, resin 130 is provided to fill a gap space between the outer surface of stator core 121 and the inner surface of housing 110. For example, resin 130 is filled in a gap space between case 110 and stator core 121 except for a portion where the inner circumferential surface of case 110 and the outer circumferential surface of stator core 121 are in close contact, a gap space between the bottom surface of case 110 and stator core 121 and winding coil 122, and a gap space between two adjacent winding coils 122. In the present embodiment, resin 130 is molded so as to cover substantially the entire stator 120 disposed in case 110. Thus, the respective surfaces of stator core 121 and winding coil 122 are molded by resin 130. As shown in fig. 1, resin 130 is filled from the upper portion of stator 120 to bottom portion 110d of case 110.

Resin 130 is made to flow into housing 110 in a liquid state and cured, so that a gap space between stator core 121 and housing 110 can be filled. 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 housing 110 by flowing a liquid thermosetting resin into the housing 110, heating or drying the resin, and curing the resin. In order to improve the heat dissipation property of the resin 130, an additive material made of an inorganic material having high thermal conductivity may be mixed into the resin 130.

As shown in fig. 1 to 3, a sealing member 140 is provided in the housing 110. The sealing member 140 is used to suppress leakage of the liquid resin from the female screw portion 111 when the liquid resin is poured into the housing 110 to mold the resin 130. Thus, the sealing member 140 closes the internal thread portion 111 from the inside of the housing 110. In the present embodiment, the sealing member 140 is a thin plate-like and band-like adhesive tape having a laminated structure of a base layer and an adhesive layer, and is attached along the inner surface of the housing 110. As the sealing member 140, for example, a resin adhesive tape in which a base layer is a resin film can be used. This enables the sealing member 140 to be easily fixed to the housing 110.

The sealing member 140 is preferably transparent. By using the transparent sealing member 140, the inside of the housing 110 can be visually observed through the sealing member 140 and the internal thread portion 111. This makes it possible to confirm that the resin 130 in the housing 110 is present up to the position of the female screw portion 111 covered with the sealing member 140.

The sealing member 140 is preferably able to withstand the temperature at which the liquid resin is cured to mold the resin 130. In particular, when stator core 121 is fixed to case 110 by shrink fitting, a sealing member having excellent heat resistance is preferably used as sealing member 140. For example, the sealing member 140 having heat resistance capable of withstanding a temperature of about 250 ℃.

In this embodiment, the transparent sealing member 140 having excellent heat resistance is used. Specifically, as the sealing member 140, a transparent resin adhesive tape having a polyimide resin film having heat resistance of 250 ℃.

The sealing 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 layer. In this case, as the metal pressure-sensitive adhesive tape, an aluminum foil pressure-sensitive adhesive tape having an aluminum foil as a base layer can be used. Since the metal adhesive tape is also excellent in heat resistance, the metal adhesive tape may be used as the sealing member 140 when the stator core 121 is fixed to the housing 110 by shrink fitting.

In the present embodiment, the female screw portion 111 closed by the sealing member 140 is provided on the 2 nd inner circumferential surface 110b of the housing 110. Thus, as shown in fig. 7 and 8, the sealing member 140 is provided on the 2 nd inner circumferential surface 110b of the housing 110. In this case, the interval of the gap between the 2 nd inner circumferential surface 110b and the stator core 121 is greater than the thickness of the sealing member 140. That is, the height difference of the stepped portion between the 1 st inner circumferential surface 110a and the 2 nd inner circumferential surface 110b is greater than the thickness of the sealing member 140. Thus, the sealing member 140 is accommodated in a space region between the 2 nd inner peripheral surface 110b and the outer peripheral surface of the stator core 121 without contacting the stator core 121.

The sealing member 140 collectively seals the plurality of female screw portions 111 provided around the opening 112. In the present embodiment, the sealing member 140 collectively closes 3 female screw portions 111, namely, the two 1 st female screw portions 111a located on the lower side and the 2 nd female screw portion 111b for ground connection, out of the 41 st female screw portions 111a for cover attachment. In this way, by collectively closing the plurality of female screw portions 111 with the sealing member 140, the plurality of female screw portions 111 can be easily closed with 1 sealing member 140.

As shown in fig. 1, electric power for supplying electric power to winding coil 122 wound around stator core 121 of stator 120 is supplied to electric connection member 150 attached to opening 112. Specifically, as shown in fig. 1, by connecting the electric wire 170 to the electric connecting member 150, three-phase ac of U-phase, V-phase, and W-phase is supplied to the electric connecting member 150 via the electric wire 170.

The electrical connection member 150 is electrically connected with the winding coil 122 via the winding wire part 124. Specifically, the electrical connection member 150 is electrically connected to the pattern wiring of the printed wiring substrate of the winding wire connection portion 124. As described above, in the winding wire connection portion 124, the plurality of winding coils 122 are connected. Accordingly, the electric power supplied to the electrical connection member 150 is supplied to each winding coil 122 via the printed wiring substrate of the winding wire 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 has a plurality of connector pins 151 that are electrically conductive, and a holder 152 formed of an insulating resin material that holds the plurality of connector pins 151. More specifically, the electrical connection member 150 is a female socket type connector terminal, and thus the holder 152 has an opening frame 152a surrounding the connector pins 151. As shown in fig. 1, a male insertion hole 171 provided at the tip end of the electric wire 170 is inserted into the opening frame 152a of the holder 152. Thus, the electric wire 170 and the electric connecting member 150 can be electrically and mechanically connected by inserting the male insertion opening 171 of the electric wire 170 into the holder 152 of the electric connecting member 150. The electric wire 170 is detachable from the electric connecting member 150.

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

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

The fitting portion 152c is provided on the bottom portion 152b on the side of the housing 110 and is shaped to fit into the opening 112. Therefore, the outer shape of the fitting portion 152c is the same as the opening shape of the opening 112. As long as the electrical connection member 150 can be attached to the opening 112, the fitting length of the fitting portion 152c may be equal to or less than the thickness of the opening 112 of the housing 110.

The through hole 152d is formed in a part of the holder 152. As shown in fig. 6, the 2 nd male screw 113b for ground connection penetrates the through hole 152 d. The through hole 152d is formed at a position overlapping with the 2 nd female screw portion 111b formed in the housing 110.

The electrical connection member 150 configured as described above is provided to close the opening 112 of the housing 110.

In the present embodiment, the holder 152 of the electrical connection member 150 is fitted into the opening 112 to close the opening 112. Thus, the opening 112 is closed by the holder 152. Specifically, the electrical connection member 150 is fixed to the housing 110 when the 2 nd male screw 113b is screwed into the 2 nd 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 2 nd male screw 113b is inserted into the through hole 152d and screwed into the 2 nd female screw 111b, whereby the electrical connecting member 150 can be fixed to the housing 110.

As shown in fig. 1 to 6, the electrical connection member 150 is covered with a cover 160. Specifically, a part of the electrical connection member 150 fitted into the opening 112 protrudes outward from the opening 112 of the case 110, and the cover 160 is disposed so as to cover the electrical connection member 150 protruding from the opening 112. In the present embodiment, the cover 160 is attached to the housing 110 so as to cover the electrical connection member 150.

As shown in fig. 6, the cap 160 is fixed to the housing 110 by the male screw 113. Therefore, as shown in fig. 3, a through hole 160a through which the male screw 113 is inserted is formed in the cover 160. Specifically, the 1 st male screw 113a of the 1 st male screws 113a and the 2 nd male screws 113b is inserted into the through hole 160 a. The cover 160 is fixed to the housing 110 by screwing the 1 st male screw 113a inserted into the through hole 160a into the 1 st female screw 111 a. The cover 160 is formed of, for example, an insulating resin material.

Next, an assembling method of the stator unit 100 will be described with reference to fig. 9A to 9D. Fig. 9A to 9D are diagrams for explaining an assembling method of the stator unit 100 according to the embodiment. In each of fig. 9A to 9D, (a) is a sectional view taken along a plane passing through the axis of the housing 110, and (b) is a sectional view taken along the line a-a of (a).

As shown in fig. 9A, first, the sealing member 140 is fixed to the housing 110 so as to close the female screw portion 111 formed in the housing 110. Specifically, the sealing member 140 is attached to the inner circumferential surface of the housing 110 so as to close the female screw portion 111.

In the present embodiment, as shown in fig. 10 (a) and 10 (b), the female screw portion 111 provided at the 2 nd inner peripheral surface 110b of the housing 110 is closed by the sealing member 140. Specifically, the sealing member 140 collectively seals 3 female screw portions 111, namely, the two 1 st female screw portions 111a located on the lower side and the 2 nd female screw portion 111b for ground connection, out of the 41 st female screw portions 111a for cover attachment.

Next, as shown in fig. 9B, the stator 120 to which the winding coil 122 is connected at the winding wire connecting portion 124 is inserted into the case 110, and as shown in fig. 9C, the stator 120 is disposed in the case 110.

At this time, as shown in fig. 9B, the sealing member 140 is fixed to the 2 nd inner circumferential surface 110B of the housing 110. That is, the seal member 140 is fixed to the 2 nd inner peripheral surface 110b which is a surface retreated from the 1 st inner peripheral surface 110 a. In the present embodiment, the height difference d indicating the thickness of the step portion between the 1 st inner circumferential surface 110a and the 2 nd inner circumferential surface 110b is larger than the thickness of the sealing member 140. Therefore, even when the sealing member 140 is stuck to the inner surface of the housing 110 and the inner diameter of the housing 110 is reduced by a size corresponding to the thickness of the sealing member 140, the stator 120 can be inserted into the housing 110 without bringing the stator 120 (stator core 121) into contact with the sealing member 140 as shown in fig. 9C. This can prevent the sealing member 140 from being peeled off by the stator 120 when the stator 120 is inserted into the housing 110. That is, the sealing member 140 does not become an obstacle when the stator 120 is inserted.

In the present embodiment, stator 120 is fixed to metal case 110 by shrink fitting. Specifically, before inserting stator 120 into casing 110, metal casing 110 is heated to expand casing 110 to expand the inner diameter of casing 110, and then stator 120 is inserted into casing 110 to cool casing 110. Thereby, stator core 121 included in stator 120 is sandwiched by the inner circumferential surface of case 110, and stator 120 is fixed to case 110.

The method of fixing the stator 120 to the housing 110 is not limited to the shrink fitting, and may be press fitting or bonding.

Next, as shown in fig. 9D, a mandrel 600 (tool) having a diameter substantially equal to the inner diameter of the stator core 121 is disposed in the case 110, and the liquid resin 130A is poured into a space region surrounded by the case 110 and the mandrel 600, thereby filling the gap space in the case 110 with the liquid resin 130A. The liquid resin 130A is injected into the case 110, for example, to the vicinity of the upper portion of the stator 120.

At this time, in the present embodiment, the female screw portion 111 existing up to the height position where the liquid resin 130A is filled is closed by the sealing member 140. This can prevent the liquid resin 130A from leaking from the female screw portion 111 when the liquid resin 130A is caused to flow into the housing 110.

In addition, in the present embodiment, a transparent sealing member is used as the sealing member 140. This allows the inside of the case 110 to be visually observed through the sealing member 140 and the female screw portion 111, and thus it can be confirmed that the liquid resin 130A is filled up to the position of the female screw portion 111 covered with the sealing member 140.

The liquid resin 130A is not injected to the position of the opening 112 formed in the case 110. That is, the upper limit of the injected liquid resin 130A is located below the opening 112. This also suppresses leakage of the liquid resin 130A from the opening 112.

Then, the liquid resin 130A is heated and cured, whereby the resin 130 filling the gap space in the case 110 can be molded (see fig. 1).

This enables the stator unit 100 to be manufactured in which the stator 120 disposed in the housing 110 is covered with the resin 130.

In addition, then, as shown in fig. 11, the electrical connection member 150 is fixed to the housing 110, and the ground connection of the housing 110 is performed by the 2 nd male screw 113 b. Next, the 1 st bearing 410, the rotor 200 to which the shaft 300 is fixed, and the bracket 500 to which the 2 nd bearing 420 is fixed are sequentially disposed and fixed on the stator unit 100. Next, the electric wire 170 is connected to the electric connection member 150, and the cover 160 is fixed to the housing 110 using the 1 st male screw 113 a. Thereby, the motor 1 shown in fig. 1 is completed.

As described above, in the motor 1 according to the present embodiment, the female screw portion 111 is formed to penetrate the housing 110, but the female screw portion 111 is closed from the inside of the housing 110 by the sealing member 140. Therefore, when the liquid resin 130A flows into the case 110 to cover the stator core 121 with the resin 130, the liquid resin 130A can be prevented from leaking from the female screw portion 111.

In the motor 1 of the present embodiment, the resin 130 is formed in the case 110 in which the stator 120 is disposed, and therefore, the heat dissipation performance is excellent. Thus, the motor 1 can be reduced in size.

(modification example)

The motor and the like of the present disclosure have been described above based on the embodiments, but the present disclosure is not limited to the above embodiments.

For example, in the above embodiment, an adhesive tape is used as the sealing member 140, but the invention is not limited thereto. That is, the fixing method of the sealing member 140 to the case 110 is not limited to adhesion, and the sealing member 140 itself may not have an adhesive layer (adhesive agent). Specifically, in the case where the sealing member 140 is a metal band, the sealing member 140 may be fixed to the case 110 by welding. Alternatively, in the case of a non-adhesive tape or the like in which the sealing member 140 does not have an adhesive layer, the sealing member 140 may be fixed to the housing 110 by another fixing member having an adhesive layer or the like.

In the above embodiment, the 1 st female screw portion 111a for attaching the cover 160 and the 2 nd female screw portion 111b for grounding the housing 110 are exemplified as the female screw portions 111 formed in the housing 110, but the present invention is not limited thereto. The female screw portion 111 formed in the case 110 may be a screw hole for attaching the cooling fan to the case 110, or may be a screw hole for attaching the motor 1 to another member.

Further, 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 wire connection portion 124. In this case, it is preferable that a sealing member is separately provided so as to close the opening 112 of the case 110, and a through hole through which the lead wire passes is provided in the sealing member.

In the above embodiment, the tip of the screw screwed into the male screw 113 of the female screw 111 is located inside the female screw 111 and does not contact the sealing member 140, but the present invention is not limited thereto. For example, the tip of the screw of the male screw 113 may contact the seal member 140, or the tip of the screw of the male screw 113 may break the seal member 140.

In addition, the present disclosure also includes an embodiment obtained by implementing various modifications that can be conceived by a person skilled in the art to the above-described embodiment, and an embodiment obtained by arbitrarily combining the constituent elements and functions of the above-described embodiment within a scope that does not depart from the gist of the present disclosure.

Industrial applicability

The technique of the present disclosure is applicable to a small-sized motor, an electric device provided with the motor, and the like.

Description of the reference numerals

1. 1001, a motor; 100. a stator unit; 110. 1110, a shell; 110a, 1 st inner circumferential surface; 110b, 2 nd inner peripheral surface; 110c, a thick-walled portion; 110d, bottom; 111. an internal thread portion; 111a, 1 st internal thread portion; 111b, the 2 nd internal thread portion; 112. 1112, an opening part; 113. an external screw member; 113a, 1 st external screw; 113b, No. 2 external screw; 120. a stator; 121. a stator core; 121a, teeth; 122. a winding coil; 123. an insulator; 124. a winding wiring portion; 130. a resin; 130A, liquid resin; 140. 1140, a sealing member; 150. an electrical connection member; 151. a connector pin; 152. a holder; 152a, an opening frame; 152b, a bottom plate part; 152c, an embedding part; 152d, a through hole; 160. a cover; 160a, a through hole; 170. an electric wire; 171. a male socket; 200. a rotor; 300. a shaft; 410. a 1 st bearing; 420. a 2 nd bearing; 500. a support; 600. a mandrel; 1141. a through hole; 1150. and (6) leading out wires.

Claims

1. An electric motor, wherein,

the motor includes:

a housing having 1 or more through female screw portions formed therein;

a stator core disposed within the housing;

a resin filled at least between the stator core and the housing; and

a sealing member that closes the internal thread portion from an inside of the housing.

2. The motor according to claim 1, wherein,

the sealing member is a tape-shaped adhesive tape attached along an inner surface of the housing.

3. The motor according to claim 2, wherein,

the sealing member is transparent.

4. The motor according to claim 2 or 3,

the base material layer of the sealing member is formed of a polyimide resin film.

5. The motor according to claim 2, wherein,

the base material layer of the sealing member is formed of a metal film.

6. The motor according to any one of claims 1 to 5,

the housing has a 1 st inner peripheral surface contacting the outer peripheral surface of the stator core and a 2 nd inner peripheral surface facing the outer peripheral surface of the stator core with a gap therebetween,

the female screw portion closed by the seal member is provided on the 2 nd inner peripheral surface,

the gap has a spacing greater than a thickness of the sealing member.

7. The motor according to any one of claims 1 to 6,

the internal thread portion is formed in plurality.

8. The motor according to claim 7, wherein,

the housing has an opening portion to which a power supply connection member is attached, and the power for supplying power to a winding coil wound around the stator core is supplied to the power connection member,

the motor further includes a cover covering the electrical connection member,

1 of the internal thread portions is a 1 st internal thread portion into which a 1 st external screw is screwed,

the cover is fixed to the housing by screwing the 1 st male screw inserted through a through hole formed in the cover into the 1 st female screw.

9. The motor according to claim 7 or 8,

1 of the female screw portions is a 2 nd female screw portion which becomes a part of a ground path.

10. The motor according to any one of claims 6 to 9,

the seal member collectively seals the plurality of female screw portions.