CN111384811A

CN111384811A - Motor with a stator having a stator core

Info

Publication number: CN111384811A
Application number: CN201911307678.3A
Authority: CN
Inventors: 川岛丈典
Original assignee: Nidec Techno Motor Corp
Current assignee: Nidec Techno Motor Corp
Priority date: 2018-12-26
Filing date: 2019-12-18
Publication date: 2020-07-07
Also published as: JP2020108183A

Abstract

Providing a motor having: a stationary portion including a stator; and a rotating part which rotates around a central axis extending vertically and includes a rotor disposed to face the stator. The stationary portion includes: a housing that holds a stator; and a cover fixed to the housing. The housing is open at least at a housing opening portion formed at one side in the axial direction, and has a recess recessed in the axial direction from the housing opening portion. At least a part of the rotating portion is located inside the recess. The outer peripheral surface of the housing further has a housing-side engaging portion. The cover has a plate portion and a cover engagement member. At least a part of the cover engaging member is covered by the plate portion, and the cover engaging member has a cover side engaging portion exposed from the plate portion. The cover side engaging portion engages with the housing side engaging portion, and the cover covers the housing opening portion.

Description

Motor with a stator having a stator core

Technical Field

The present invention relates to a motor.

Background

Patent document 1 discloses a motor including: a stator (stator assembly 200, 300); a front plate 210 that contacts the stator at one end side in the axial direction and engages with the circuit board 600; an end plate 310 that is in contact with the stator at the other end side in the axial direction; and a belt 500 which is disposed between the front plate 210 and the end plate 310 and around the outer periphery of the stator, and which connects the two plates 210 and 310 to each other with the stator interposed therebetween.

Patent document 1: japanese patent laid-open publication No. 2017-70206

The motor of patent document 1 is fixed to an end plate by attaching a belt as another member. In this structure, when it is necessary to attach a member fixed to the actual machine to the end plate, for example, interference with the belt may occur. In particular, when assembling the motor, if it is necessary to mount the belt while avoiding the components on the end plate, there is a problem that the belt cannot be easily mounted.

Disclosure of Invention

The purpose of the present invention is to provide a structure that enables a cover used for a motor to be easily attached without interfering with other components.

An exemplary 1 st invention of the present application is a motor, wherein the motor includes: a stationary portion including a stator; and a rotating portion that rotates around a central axis extending vertically, the rotating portion including a rotor disposed to face the stator, the stationary portion including: a housing that holds the stator; and a cover fixed to the housing, the housing being open at least at a housing opening portion formed at one side in an axial direction, the cover having a recess recessed in the axial direction from the housing opening portion, at least a part of the rotating portion being located inside the recess, the housing further having a housing-side engaging portion on an outer peripheral surface of the housing, the cover having a plate portion and a cover engaging member, at least a part of the cover engaging member being covered by the plate portion, the cover engaging member having a cover-side engaging portion exposed from the plate portion, the cover-side engaging portion being engaged with the housing-side engaging portion, the cover covering the housing opening portion.

According to exemplary invention 1 of the present application, the cover covering the motor can be firmly fixed, and the cover can be easily fixed.

Drawings

Fig. 1 is an overall perspective view of a cover side of a motor according to embodiment 1 of the present invention.

Fig. 2 is a longitudinal sectional view of the motor according to embodiment 1 of the present invention.

Fig. 3 is an internal perspective view of the motor according to embodiment 1 of the present invention.

Fig. 4 is an overall perspective view of the bottom side of the motor according to embodiment 1 of the present invention.

Fig. 5 is a top perspective view of the cover of embodiment 1 of the present invention.

Fig. 6 is a bottom perspective view of the cover of embodiment 1 of the present invention.

Fig. 7 is a bottom perspective view of the cover engagement member according to embodiment 1 of the present invention.

Fig. 8 is a partially enlarged view of the cover according to embodiment 1 of the present invention.

Fig. 9 is a partially enlarged view of the housing of embodiment 1 of the present invention.

Fig. 10 is a top perspective view of the cover of embodiment 2 of the present invention.

Fig. 11 is a top perspective view of the cover engagement member according to embodiment 2 of the present invention.

Description of the reference symbols

1: a motor; 2: a stationary portion; 3: a rotating part; 9: a central axis; 21: a stator; 22: a housing; 23: a cover; 31: a shaft; 32: a rotor; 220: a housing opening; 221: a bottom; 222: a sidewall portion; 225: a housing-side engaging portion; 226: a groove part; 231: a plate portion; 232: a cover engaging member; 233: a cover inside protrusion; 234: a clamping part configuration part; 237: a cover-side cutout; 2311: a cover recess; 2321: a cover side engaging portion; 2322: a connecting portion; 2323: a coupling convex portion.

Detailed Description

Hereinafter, exemplary embodiments of the present invention will be described with reference to the drawings. In the present application, a direction parallel to the central axis of the motor is referred to as an "axial direction", a direction perpendicular to the central axis of the motor is referred to as a "radial direction", and a direction along an arc centered on the central axis of the motor is referred to as a "circumferential direction". In the present application, the shape and positional relationship of each portion will be described with the axial direction as the vertical direction and the cover side as the upper side with respect to the stator. However, the orientation of the motor of the present invention during manufacturing and during use is not intended to be limited by the definition of the vertical direction.

< 1. embodiment 1 >

< 1-1. construction of Motor

Fig. 1 is an overall perspective view of the motor 1 on the cover side. Fig. 2 is a longitudinal sectional view of the motor 1. Fig. 3 is an internal perspective view of the motor 1. Fig. 4 is an overall perspective view of the bottom side of the motor 1. The motor 1 is a molded motor of a so-called inner rotor type in which a rotor 32 is disposed radially inside a stator 21, which will be described later, and is covered with resin. The motor 1 is used for home electric appliances such as an air conditioner. However, the motor of the present invention may be used for applications other than home electric appliances. For example, the motor of the present invention may be mounted on transportation equipment such as automobiles and railways, OA equipment, medical equipment, tools, industrial large-sized equipment, and the like, to generate various driving forces.

As shown in fig. 1 and 2, the motor 1 includes a stationary portion 2 and a rotating portion 3. The stationary portion 2 and the rotating portion 3 are opposed to each other in the radial direction. The stationary unit 2 is mounted on a device to be driven. The rotating portion 3 is supported rotatably about a central axis 9 extending vertically with respect to the stationary portion 2 via an upper bearing 71 and a lower bearing 72.

The stationary portion 2 includes a stator 21, a housing 22, a cover 23, and a circuit board 51.

The stator 21 is an armature that generates magnetic flux in accordance with a drive current supplied from an external power supply via a circuit board 51 provided in the motor 1. The stator 21 annularly surrounds the center axis 9. The stator 21 has a stator core 211, an insulator 212, and a plurality of coils 213. The stator core 211 is a magnetic body having an annular core back 2111 and a plurality of teeth 2112 protruding radially inward from the core back 2111. The core back 2111 is arranged substantially coaxially with the central axis 9. The plurality of teeth 2112 are arranged at equal intervals in the circumferential direction. For example, laminated steel plates are used for the stator core 211.

The insulator 212 is mounted on the stator core 211. The material of the insulating member 212 uses resin as an insulator. The insulator 212 covers at least a portion of the surface of the stator core 211. Specifically, the insulator 212 covers the axial upper end surface, the axial lower end surface, and both circumferential surfaces of the plurality of teeth 2112. The coil 213 is formed of a conductive wire wound around the plurality of teeth 2112 with the insulating material 212 interposed therebetween.

The housing 22 is a resin member that holds the stator 21. More specifically, the housing 22 covers the stator 21 so that at least the radially inner end surface of each tooth 2112 is exposed. The housing 22 is open at a housing opening 220 formed at an axially upper side, and has a recess 223 recessed axially downward from the housing opening 220. A part of the shaft 31 and the rotor 32 in the rotating portion 3 described later are located inside the concave portion 223. The housing 22 has a bottom 221 and side wall portions 222.

The bottom 221 is expanded in a plate shape in the radial direction. Here, the term "spread in the radial direction" includes not only a case where the sheet-like member is spread in the radial direction but also a case where the sheet-like member is inclined, a case where the sheet-like member has a step, and the like. The bottom 221 is located axially below the stator 21 and the rotor 32. In addition, the bottom 221 has a housing projection 224. The housing protrusion 224 protrudes in a cylindrical shape from the bottom 221 toward the axially lower side around the central axis 9. Further, a lower vibration isolation member 62 is attached to the outer peripheral surface of the case protrusion 224.

The side wall portion 222 extends from the bottom portion 221 in a cylindrical shape centered on the central axis 9 toward the axially upper side. Further, a rotor 32 described later is disposed radially inward of the side wall portion 222. In the present embodiment, at least the outer peripheral surface of the stator 21 and the plurality of coils 213 of the stator 21 are embedded and covered with the resin forming the side wall portion 222. This can prevent water droplets from falling on the stator 21. In addition, the stator core 211 and the plurality of coils 213 of the stator 21 can be electrically insulated from the outside. However, a part of the stator 21 including the radially inner end surface of the tooth 2112 may be exposed from the side wall portion 222.

As shown in fig. 3, a cutout portion 2221 is formed in a part of the side wall portion 222. A bush 91 is disposed in the notch portion 2221. The bush 91 is a member for routing and holding a lead (not shown) connected to the circuit board 51 from the inside to the outside of the side wall portion 222. The lead wires supply external power to the circuit board 51 or transmit control signals from the actual machine. The bush 91 is sandwiched and fixed between the housing 22 and the cover 23 in the cutout portion 2221.

The rotating portion 3 has a shaft 31 and a rotor 32. The shaft 31 is a columnar member disposed along the center axis 9. The shaft 31 is fixed relative to the rotor 32. As a fixing method, there is a method of press-fitting and fixing, and integrally fixing by covering with a resin material. The shaft 31 is supported by an upper bearing 71 and a lower bearing 72. Thereby, the shaft 31 and the rotor 32 rotate about the central axis 9 with respect to the stationary portion 2 including the housing 22 while being supported by the upper bearing 71 and the lower bearing 72.

The rotor 32 is fixed to the outer peripheral surface of the shaft 31, and extends annularly around the shaft 31 around the central axis 9. The rotor 32 is disposed to face the radially inner side of the stator 21. The rotor 32 has a magnet 33. In the present embodiment, the magnet 33 is housed and fixed inside the rotor 32. The outer peripheral surface of the rotor 32 is radially opposed to the radially inner end surface of the teeth 2112 of the stator 21 with a slight gap therebetween. In the present embodiment, the magnet 33 is housed and fixed inside the rotor 32, but may be disposed radially outside the rotor 32. In this case, the magnet 33 is opposed to the radially inner end surface of the tooth 2112 of the stator 21 with a slight gap therebetween in the radial direction.

The cover 23 is fixed to the housing 22 by a fixing structure described later and covers the housing opening 220. The cover 23 includes a plate portion 231 and a cover engagement member 232.

Plate portion 231 is made of resin. Plate 231 expands like a plate in the radial direction. Here, the term "spread in the radial direction" includes not only a case where the sheet-like member is spread in the radial direction but also a case where the sheet-like member is inclined, a case where the sheet-like member has a step, and the like.

Plate 231 has a cover outside protrusion 235. The cover outer side protrusion 235 protrudes in a cylindrical shape from the plate portion 231 toward the axially upper side around the center axis 9. An upper vibration isolating member 61 is attached to the outer peripheral surface of the cover outer side protrusion 235.

Further, cover 23 is formed with a cover through hole 236 that penetrates in the axial direction. More specifically, the cover through hole 236 axially penetrates the cover outer protruding portion 235 and a cover inner protruding portion 233 described later. The upper portion of the shaft 31 of the present embodiment axially penetrates the cover through hole 236 and protrudes outside the motor 1. An impeller (not shown) for conveying air used for a blower, for example, is attached to an upper end portion of the shaft 31.

An upper bearing housing member 81 is attached to the inner peripheral surface of the cover outer protrusion 235. At least one of the upper bearing housing members 81 is open and houses the upper bearing 71. In the present embodiment, the upper bearing 71 is a slide bearing. The upper bearing 71 is provided with a hole portion through which the shaft 31 passes. The upper bearing 71 supports the shaft 31 to slide on the inner circumferential surface of the hole. The outer peripheral surface of the upper bearing 71 is spherical, and the orientation of the shaft 31 with respect to the center axis 9 is adjusted by sliding and tilting with respect to the inner peripheral surface of the upper bearing housing member 81.

As shown in fig. 2 and 4, the lower bearing housing member 82 is attached to the inner peripheral surface of the housing protrusion 224. At least one of the lower bearing housing members 82 is open to house the lower bearing 72. In the present embodiment, the lower bearing 72 is a slide bearing. The lower bearing 72 is provided with a hole portion through which the shaft 31 passes. The lower bearing 72 supports the shaft 31 to slide on the inner circumferential surface of the hole. The outer peripheral surface of the lower bearing 72 has a spherical shape, and is inclined by sliding on the inner peripheral surface of the lower bearing housing member 82, thereby adjusting the orientation of the shaft 31 with respect to the center axis 9.

In the present embodiment, the slide bearing structure has been described with respect to the upper bearing 71 and the lower bearing 72, but other types of bearings may be employed. For example, ball bearings may also be used. In this case, the upper bearing housing member 81 and the lower bearing housing member 82 are made of metal, and a structure is adopted in which the outer ring of the ball bearing is fitted into the inner circumferential surfaces of the upper bearing housing member 81 and the lower bearing housing member 82 by press fitting or the like.

As described above, when the motor 1 is driven, the coil 213 is supplied with the driving current from the external power supply via the wire. Thereby, a magnetic field is generated in the plurality of teeth 2112 of the stator core 211. Then, a circumferential torque is generated by an action of the magnetic field applied between the teeth 2112 and the magnet 33 mounted on the rotor 32. As a result, the rotating portion 3 rotates about the central axis 9. An impeller (not shown) attached to an upper end portion of the shaft 31 rotates together with the rotating portion 3

< 1-2. detailed structure of cover and case >

Next, a structure for fixing the cover 23 and the housing 22 will be described in more detail.

Fig. 5 is a top perspective view of the cover 23. Fig. 6 is a bottom perspective view of the cover 23. Fig. 7 is a bottom perspective view of the cover engaging member 232. Fig. 8 is a partially enlarged view of the cover 23. Fig. 9 is a partially enlarged view of the housing 22.

As shown in fig. 5, plate portion 231 of cover 23 is a resin member, and is fixed by covering a part of cover engaging member 232 with resin. More specifically, the plate 231 includes a cover inner protruding portion 233, an engaging portion arrangement portion 234 protruding radially outward of the cover inner protruding portion 233, and a cover outer protruding portion 235. A plurality of cover-side engagement portions 2321, which will be described later, are exposed axially downward from the engagement portion placement portion 234 of the plate portion 231.

As shown in fig. 6, the cover inner protruding portion 233 protrudes in a cylindrical shape downward from the axially lower surface of the plate portion 231 around the center axis 9. The outer peripheral surface of the cover inner protruding portion 233 is fitted to the inner peripheral surface of the side wall portion 222 of the housing 22 by press fitting. Thereby, the cover 23 is fixed with respect to the housing 22.

As shown in fig. 3, the housing 22 has a housing-side engaging portion 225 formed on the outer peripheral surface of the side wall portion 222. The housing-side engaging portion 225 is formed in plural numbers, and the number thereof is the same as the number of the cover-side engaging portions 2321 of the cover engaging member 232. Further, the housing-side engaging portions 225 are provided at intervals corresponding to the cover-side engaging portions 2321. Thus, the case opening 220 is covered by the cover 32, and the case-side engagement portion 225 engages with the cover-side engagement portion 2321 of the cover engagement member 232.

If the plate portion is a metal member, it needs to be formed by a forming method such as punching or drawing of a steel plate, and it is difficult to form the plate portion into a complicated shape. On the other hand, when plate portion 231 is a resin member as in the embodiment of the present invention, the shape can be easily formed by flowing a resin having fluidity into a cavity provided inside a resin molding die.

A motor in which the stator 21 is covered and held by the resin case 22 is referred to as a so-called molded motor. The molded motor is driven by high-frequency inverter control, thereby generating a potential difference across the housing 22 and the cover 23. This causes insulation breakdown due to a potential difference generated in the bearing, which may cause electric discharge and cause wear of the bearing (electric corrosion of the bearing). If the cover holding the bearing is made of metal, the galvanic corrosion of the bearing becomes more remarkable. However, by making the cover 23 of resin, the galvanic corrosion of the bearing can be reduced.

The cover 23 is fixed to the housing 22 by press-fitting the outer peripheral surface of the cover inner protruding portion 233 of the plate portion 231 into the inner peripheral surface of the side wall portion 222. However, since plate portion 231 and housing 22 are made of resin, there is a possibility that the pressing force may be weakened due to expansion/contraction caused by heat generated during motor driving or external air temperature. As in the embodiment of the present invention, even if the press-fitting force of the cover 23 and the housing 22 is weak, the cover 23 can be prevented from coming off the housing 22 by engaging the cover-side engaging portion 2321 with the housing-side engaging portion 225.

Further, since the housing-side engaging portion 225 is configured to be inserted into the cover 32, a conventional step of fixing the cover to the housing using an engaging member such as a belt as another member is not required. Further, since it is not necessary to fix the engaging member to the outside of the cover, when the external attachment member such as the vibration isolating member is attached, the engaging member does not interfere with the external attachment member.

As shown in fig. 7 and 8, the cover engagement member 232 includes a plurality of cover-side engagement portions 2321 and connection portions 2322. The coupling portion 2322 has an annular shape. In the present embodiment, the cover-side engagement portion 2321 is a U-shaped hook-shaped member that opens upward in the axial direction. The cover-side engagement portion 2321 and the coupling portion 2322 are connected to each other on the outer peripheral surface of the coupling portion 2322. The cover-side engagement portion 2321 protrudes axially downward from the connection portion 2322. The cover-side engagement portions 2321 are coupled to each other at circumferentially spaced intervals by a coupling portion 2322. When plate portion 231 is molded, cover engaging member 232 is disposed in a cavity inside the resin molding die, and the resin is poured into the cavity of the resin molding die to be integrally molded. The plurality of cover-side engaging portions 2321 are coupled by the coupling portion 2322, so that it is not necessary to arrange the plurality of cover-side engaging portions 2321 in the resin molding die.

As shown in fig. 5 and 6, the coupling portion 2322 is covered with the plate portion 231 at the position of the engaging portion disposing portion 234. Each cover-side engagement portion 2321 is exposed from the lower surface of the engagement portion placement portion 234. More specifically, as shown in fig. 8, a cover side cutout 237 is provided at a position corresponding to the cover side engagement portion 2321 on the outer peripheral side of the engagement portion disposition portion 234. The cover-side notch 237 is notched so as to be continuous with the opening of the cover-side engagement 2321. Cover-side cutout 237 is a mark formed in plate 231 by closing the opening of cover-side engagement portion 2321 with a resin molding die in order to expose cover-side engagement portion 2321 from plate 231.

A plurality of coupling protrusions 2323 are formed on the axial lower surface of the coupling 2322. The axial end surface of each coupling convex portion 2323 is exposed from plate portion 231. When the cover engaging member 232 is integrally molded by resin molding, it is necessary to perform axial positioning. The axial end surface portion of the coupling convex portion 2323 exposed from the plate portion 231 is a trace of the positioning portion of the resin molding die.

Circumferential side surfaces and radial side surfaces of each coupling convex portion 2323 are covered with the plate portion 231. More specifically, the coupling portions 2322 between the coupling convex portions 2323 are covered with the plate portions 231. Thus, the cover engagement member 232 is held by the plate 231 and can be prevented from coming off in the axial direction. Further, the coupling convex portion 2323 serves as a rotation stopper for the plate portion 231, and the cover engagement member 232 is more firmly fixed to the plate portion 231.

The axial end surface of the coupling convex portion 2323 is preferably located at the same height in the axial direction as the lower end surface of the plate portion 231. If the height of any one surface is different, a gap is formed between the cover 23 and the side wall portion 222 of the housing 22, and foreign matter or moisture may enter the motor through the gap. By setting the axial end surface of the coupling convex portion 2323 to a surface having the same height in the axial direction as the lower end surface of the plate portion 231, a gap can be prevented from being generated between the cover 23 and the side wall portion 222. As described above, the lower end surface of the plate 231 and the coupling convex portion 2323 contact the axial upper end surface of the side wall portion 222.

Cover recess 2311 is formed on the upper surface of plate 231. In the cover recess 2311, the upper surface of the connection portion 2322 is exposed from the plate portion 231. When the cover engaging member 232 is integrally molded by resin molding, it is necessary to prevent the cover engaging member 232 from floating due to the flow of resin. At this time, the mold for preventing floating provided in the resin molding mold is brought into contact with the cover engagement member 232. The cover recess 2311 is a mark of the mold for prevention of floating.

The cover engagement member 232 is a resin member, and preferably has a higher melting temperature than the material of the plate portion 231. The material of the cover engaging member 232 needs to be the following: when cover engaging member 232 is insert molded on plate portion 231, the resin constituting plate portion 231 is not melted by heat.

At least the cover-side engaging portion 2321 of the cover engaging member 232 is preferably made of a material having a higher elastic force than the plate portion 231. Since plate portion 231 needs to be pressed into housing 22 or held by a bearing material, the strength needs to be such that plate portion 231 does not deform. On the other hand, when the cover engagement member 232 is attached to the housing 22 in the axial direction, the spring force is preferably high in consideration of ease of attachment.

As shown in fig. 3 and 9, the housing-side engaging portion 225 is inclined radially outward from the housing opening 220 toward the bottom 221 in the axial direction (i.e., downward from the axial direction). More specifically, the housing-side engagement portion 225 includes an inclined surface 2251 and a stepped surface 2252. When the cover 23 is attached to the housing 22, the cover 23 is moved downward from the axial direction. At this time, the cover-side engagement portion 2321 contacts the inclined surface 2251 of the housing-side engagement portion 225. By further moving the cover 23 axially downward, the cover-side engagement portion 2321 extends outward and rides over the inclined surface 2251. The cover-side engagement portion 2321 returns to the inside when passing over the inclined surface 2251, and is caught on the stepped surface 2252. With this configuration, the cover 23 can be easily attached to the housing 22.

Since the cover-side engagement portion 2321 needs to return to the original position after passing over the inclined surface 2251 of the housing-side engagement portion 225, the material of the cover-side engagement portion 2321 is preferably a material having a high elastic force.

A groove 226 is formed on the outer peripheral surface of the housing 22, and the housing-side engaging portion 225 is located at the position of the groove 226. The groove portion 226 prevents the housing-side engaging portion 225 from protruding outside the outer diameter of the side wall portion 222, and thus prevents the outer diameter of the motor from increasing.

The groove portion 226 extends from the case opening portion 220 of the side wall portion 222 of the case 22 to the bottom portion 221, i.e., from the axial upper end to the lower end. In forming the housing 22 by a resin molding die, a resin molding die separated up and down is used. When the stepped surface 2252 of the housing-side engaging portion 225 is formed by a resin molding die, the groove portion 226 extends from the housing opening portion 220 of the side wall portion 222 of the housing 22 to the bottom portion 221 because the upper and lower resin molding dies are arranged with the stepped surface 2252 as a boundary. Therefore, a separate mold inserted from the lateral direction is not required, and the cost of the mold can be reduced.

< 2 > embodiment 2

Next, the structure of cover 23B according to embodiment 2 of the present invention will be described. Fig. 10 is a top perspective view of the cover 23B. Fig. 11 is a top perspective view of the cover engaging member 232B. Since the parts other than the cover 23B of embodiment 2 have the same structure as those of embodiment 1, redundant description is omitted.

In embodiment 1 of the present invention, the coupling portion 2322 of the cover engagement member 232 has a plurality of coupling portion protrusions 2323 formed on an axially lower surface thereof. However, in embodiment 2 of the present invention, a plurality of coupling convex portions 2323B are formed on the axial upper surface of the coupling portion 2322B of the cover engagement member 232B. The axial end surface of each coupling convex portion 2323B is exposed from plate portion 231B. When the cover engaging member 232B is integrally molded by resin molding, it is necessary to perform axial positioning of the cover engaging member 232B. The axial end surface portion of the coupling convex portion 2323B exposed from the plate portion 231B is a trace of the positioning portion of the resin molding die.

Circumferential side surfaces and radial side surfaces of each coupling convex portion 2323B are covered with the plate portion 231B. More specifically, the coupling 2322B between the coupling convex portions 2323B is covered by the plate portion 231B. This allows the cover engagement member 232B to be held by the plate 231B, thereby preventing the cover engagement member from coming off in the axial direction. Further, the coupling convex portion 2323B serves as a rotation stopper for the plate portion 231B, and the cover engagement member 232B is more firmly fixed to the plate portion 231B.

< 3. modification example >

Although the present invention has been described above with reference to the exemplary embodiments, the present invention is not limited to the above-described embodiments.

In the above-described embodiment and modification, the shaft penetrates the cover in the axial direction and protrudes outside the motor. However, the shaft may extend axially through the housing projection of the housing and project outwardly of the motor.

The structure of the motor of the present invention is not limited to the definition of the vertical direction described in the above embodiment and the modification. That is, the "(axial) upper side" used in the above-described embodiments and modifications may be read as "one side (axial)" and the "(axial) lower side" may be read as "the other side (axial)". Further, the "(axial) upper side" used in the above-described embodiments and modifications may be read as "the other side" (axial) and the "(axial) lower side" may be read as "the one side" (axial).

The detailed shapes of the respective members may be different from those shown in the drawings of the present application. In addition, the respective elements appearing in the above-described embodiments or modified examples may be appropriately combined within a range in which contradiction does not occur.

Industrial applicability

The present invention can be applied to a motor.

Claims

1. A motor, comprising:

a stationary portion including a stator; and

a rotating part which rotates around a central axis extending vertically and includes a rotor disposed to face the stator,

the stationary portion includes:

a housing that holds the stator; and

a cover fixed to the housing,

the housing is open at least at a housing opening portion formed at an upper side in an axial direction, and has a recess recessed from the housing opening portion toward a lower side in the axial direction,

at least a portion of the rotating portion is located inside the recess,

the outer peripheral surface of the housing further has a housing-side engaging portion,

the cover has a plate portion and a cover engaging member,

at least a part of the cover engaging member is covered with the plate portion, and the cover engaging member has a cover-side engaging portion exposed from the plate portion,

the cover side engaging portion engages with the housing side engaging portion, and the cover covers the housing opening portion.

2. The motor of claim 1,

the plate portion is a resin member.

3. The motor of claim 2,

the plate portion has a cover inner side protruding portion protruding downward in the axial direction and an engaging portion arrangement portion protruding outward in the radial direction from the cover inner side protruding portion,

the cover inner side protruding portion is fitted to the inner peripheral surface of the housing at the housing opening,

at least the cover-side engaging portion of the cover engaging member is exposed in the axial direction in the engaging portion disposing portion.

4. The motor according to any one of claims 1 to 3,

the cover side engaging part has a plurality of engaging parts,

the cover-side engagement portions are connected to each other by a connection portion.

5. The motor of claim 4,

a cover concave portion is formed on the plate portion,

in the cover recess, the connection portion is exposed from the plate portion.

6. The motor according to claim 4 or 5,

a plurality of coupling part convex parts are formed on the coupling part,

the side surface of the connecting portion convex portion is covered with the plate portion.

7. The motor of claim 6,

the end surface of the connecting portion protrusion is exposed from the plate portion.

8. The motor according to any one of claims 2 to 7,

the cover engaging member is a resin member,

the cover engaging member has a material melting temperature higher than a material melting temperature of the plate portion.

9. The motor according to any one of claims 2 to 8,

the cover engaging member is a resin member,

at least the cover-side engaging portion of the cover engaging member is made of a material having a higher elastic force than a material of the plate portion.

10. The motor of claim 9,

the housing-side engaging portion is inclined radially outward from the axially upward direction toward the downward direction.

11. The motor according to any one of claims 1 to 10,

a groove portion is formed on an outer circumferential surface of the housing,

the shell side engaging portion is located in the groove portion.

12. The motor of claim 11,

the groove portion extends from an axially upper end to a lower end of the housing.