CN208806687U - Motor - Google Patents

Abstract

A kind of motor, includes rotor, can be pivoted about with rotation axis；And stator, rotor is driven.Rotor includes the shell of tubular；And cover, it is installed on the axial upper end of shell.The wall portion that cover has the radially inner side positioned at shell and extends in the circumferential, wall portion include the 1st wall portion, contact with a part of the radial shell medial surface of shell；And the 2nd wall portion, from the axial lower end of the 1st wall portion, downside extends in the axial direction.The 1st distance radially between the 1st lateral surface and rotation axis of 1st wall portion is greater than the 2nd distance radially between the 2nd lateral surface and rotation axis of the 2nd wall portion.2nd lateral surface is opposed with shell medial surface across bonding agent.

Description

Motor

Technical field

The utility model relates to motors.

Background technique

In the past, there is known a kind of motor with rotor, which is connected with cover on cricoid shell.Such as in It is in the motor of No. 105846600 specification of state's patent application publication, head shade assembly is chimeric with the ring-shaped shell of rotor portions.

However, being pressed into the motor that Chinese patent application discloses No. 105846600 specification by head shade assembly In the case where being fixed on ring-shaped shell, it can integrally apply load to head shade assembly.

In addition, it is also considered that the method that will be bonded together between ring-shaped shell and head shade assembly using bonding agent.But In the case where only both progress have used the bonding of bonding agent, there is the interval for bonding agent to be arranged therebetween.Cause This, is when head shade assembly is embedded in ring-shaped shell, the installation in the direction that head shade assembly is extended relative to ring-shaped shell Angle is easy to produce deviation.In addition, head shade assembly is also easy to produce deviation relative to the radial installation site of ring-shaped shell. The reason of this spin balancing for becoming rotor portions deteriorates.

Utility model content

The purpose of the utility model is to provide maintain the fixing intensity of shell and cover and inhibit the rotation of rotor portions Balance the motor deteriorated.

Motor in the embodiment illustrated of the utility model includes rotor, can centered on rotation axis into Row rotation；And stator, rotor is driven.Rotor includes the shell of tubular；And cover, it is installed on shell Axial upper end.The wall portion that cover has the radially inner side positioned at shell and extends in the circumferential, wall portion include the 1st wall Portion is contacted with a part of the radial shell medial surface of shell；And the 2nd wall portion, from the axial lower end of the 1st wall portion Downside extends in the axial direction in portion.The 1st distance radially between the 1st lateral surface and rotation axis of 1st wall portion is greater than the 2nd wall portion The 2nd lateral surface and rotation axis between the 2nd distance radially.2nd lateral surface across bonding agent and and shell medial surface It is opposed.

In the above-described embodiment, the 1st wall portion is in the tubular extended in the axial direction.

In the above-described embodiment, axial length of the axial length of the 1st wall portion less than the 2nd wall portion.

In the above-described embodiment, cover also includes round plate, prolongs centered on rotation axis and radially It stretches；Annulus centered on rotation axis, and is located at than wall portion by axial upside and than round plate by axial downside Position；Rib, will connect between round plate and annulus, extends both axially and radially and is arranged in the circumferential more It is a；And cover opening, it is set between rib and is set between round plate and annulus.

In the above-described embodiment, rotor also has extends and can be with rotation axis in the axial direction along rotation axis The axis pivoted about, cover also have an axis linking part with axis connection, the radial inner end of each rib at least than Round plate has compartment of terrain opposed radially by the position of axial downside with axis linking part.

In the above-described embodiment, rotor, which also has, is configured at shell medial surface and is arranged with multiple magnetic in the circumferential Iron, cover also have from the lower end in the axial direction of the 2nd wall portion in the axial direction downside it is prominent and in the circumferential be arranged with it is multiple Protrusion tab, protrusion tab configure between adjacent magnet.

In the above-described embodiment, the quantity of rib is more than the quantity of protrusion tab.

In the above-described embodiment, the quantity of magnet and the quantity of protrusion tab are identical.

In the above-described embodiment, when from end on observation, at least part of protrusion tab is Chong Die with rib.

The motor of embodiment illustrated according to the present utility model, be able to maintain that the fixing intensity of shell and cover and The spin balancing of rotor portions is inhibited to deteriorate.

By the detailed description of the preferred embodiments of the present invention below, referring to attached drawing, it can be more clearly understood that this Above-mentioned and other feature, element, step, the features and advantages of utility model.

Detailed description of the invention

Fig. 1 is the cross-sectional view for showing the structure example of motor.

Fig. 2 is the perspective view for showing the appearance of motor.

Fig. 3 A is the perspective view of the cover from axial upside.

Fig. 3 B is the perspective view of the cover from axial downside.

Fig. 4 is the cross-sectional view for showing the cover of other structures example of protrusion medial surface.

Fig. 5 is to show the figure comprising the cross-sectional configuration including wall portion and protrusion tab.

Fig. 6 A is the perspective view for showing the motor of the 1st variation of cover.

Fig. 6 B is the cross-sectional view for showing the structure of cover of the 1st variation.

Fig. 7 A is the perspective view of the cover of the 2nd variation.

Fig. 7 B is the cross-sectional view for showing the structure of cover of the 2nd variation.

Fig. 7 C is the cross-sectional view for showing the other structures of cover of the 2nd variation.

Specific embodiment

Hereinafter, being illustrated referring to embodiment illustrated of the attached drawing to the utility model.

In addition, in the present specification, in motor 100, the direction parallel with rotation axis RA is known as " axial direction ".In axis Upwards, " axial upside " will be known as from aftermentioned stator 120 towards the direction of aftermentioned cover 2, it will be from cover 2 towards stator 120 direction is known as " axial downside ".In each structural element, axis end to the upper side is known as " upper end ", it will be axial The end of downside is known as " lower end ".In addition, will be known as towards axis face to the upper side in the surface of each structural element " on Surface " will be known as " lower surface " towards the face of axial downside.

Moreover, the direction vertical with rotation axis RA is known as " radial direction ", by the rotation side centered on rotation axis RA To referred to as " circumferential direction ".Radially, " radially inner side " will be known as towards the direction of rotation axis RA, will be far from rotation axis RA's Direction is known as " radial outside ".In each structural element, the end of radially inner side is known as " inner end ", by radial outside End is known as " outer end ".In addition, in the side of each structural element " inside will be known as towards the side of radially inner side Face " will be known as " lateral surface " towards the side of radial outside.

By the medial surface 1a of the aftermentioned shell 1 in the side of each structural element be known as " shell medial surface 1a ", will after The medial surface 24a for the protrusion 24 stated is known as " protrusion medial surface 24a ".In addition, by the lateral surface 281a of aftermentioned 1st wall portion 281 The lateral surface 282a of aftermentioned 2nd wall portion 282 is known as " the 2nd lateral surface 282a " by referred to as " the 1st lateral surface 281a ".

In addition, direction discussed above, end and face etc. exhale title to be not offered as being assembled in actual equipment In the case of positional relationship and direction etc..

Fig. 1 is the cross-sectional view for showing the structure example of motor 100.Fig. 2 is the perspective view for showing the appearance of motor 100.Motor 100 are for example equipped on small-sized unmanned aerial vehicle (not shown) and rotate alar part.In addition, being not limited to the illustration, motor 100 is for example Large scale equipment of the Transport Machinery such as automobile and railway, OA equipment, Medical Devices, tool, industry etc. can also be equipped on to produce Raw various driving forces.

Motor 100 has rotor 110, stator 120 and bearing insert 130.

Rotor 110 can be rotated centered on rotation axis RA extended in the vertical direction relative to stator 120. Rotor 110 has axis 111, shell 1, cover 2 and magnet 3.Axis 111 extends in the axial direction along rotation axis RA, can be with Rotation axis RA is pivoted about.Shell 1 is in the tubular centered on rotation axis RA.It is fixed that shell 1 is accommodated in inside The top of son 120 and bearing insert 130.Cover 2 is installed on the axial upper end of shell 1.Magnet 3 is configured at shell medial surface 1a is circumferentially arranged with multiple on shell medial surface 1a.In the present embodiment, motor 100 is outer-rotor type.That is, more A magnet 3 is located at the position that radial outside is leaned on than stator 120, opposed radially with the lateral surface of stator 120.In addition, rear Text illustrates the structure of cover 2.

Stator 120 drives rotor 110 so that it is rotated.Stator 120 has stator core 121 and coil part 122. Stator core 121 is in the ring-type centered on rotation axis RA, such as the stacked steel plate by being laminated multiple electromagnetic steel plates It constitutes.Coil part 122 by across insulating part (not shown) and the conducting wire on stator core 121 is constituted.

The bearing of axis 111 is that can rotate via bearing 131a, 131b by bearing insert 130.

Next, also referring to Fig. 3 A and Fig. 3 B other than referring to Figures 1 and 2 and being illustrated to the structure of cover 2.Figure 3A is the perspective view of the cover 2 from axial upside.Fig. 3 B is the perspective view of the cover 2 from axial downside.

Cover 2 has cover opening 2a, axis linking part 21, output shaft 22, round plate 23, protrusion 24, balanced adjustment portion Part 25, annulus 26, multiple ribs 27, wall portion 28 and multiple protrusion tabs 29.

Cover opening 2a is set to the round plate 23 between multiple ribs 27 in circumferential direction and being set in axial direction and ring-type (referring to Fig. 3 A) between portion 26.In this way, can be generated between each rib 27 when rotor 110 rotates across cover opening 2a Air flowing.In addition, stirring air by each rib 27, the flowing of air becomes strong.It is rotated, can be borrowed by motor 100 It helps the flowing of such air and effectively the inside of motor 100 is cooled down.

In addition, even if in the state that cover 2 is installed on shell 1, the 2a that can also be open via cover is by balanced adjustment Component 25 is set to protrusion medial surface 24a.

Axis linking part 21 and axis 111 link.More specifically, in the present embodiment, in the lower end of output shaft 22 It is provided with the mounting hole 21a (referring to Fig.1) axially extended.The upper end of axis 111 is embedded in mounting hole 21a.Such as make The upper end of axis 111 and axis linking part 21 are linked up with bonding agent (not shown).

It is equipped in output shaft 22 such as the propeller with multiple blades (not shown).Output shaft 22 is in horse Up to such as torque of the output comprising the rotor 110 including cover 2 when 100 driving so that propeller rotates.

Round plate 23 extends radially in the circular plate centered on rotation axis RA.In addition, in this embodiment party In formula, round plate 23 extends from the outside of axis linking part 21 towards radial outside, but is not limited to the illustration, can also be from output shaft The outside in portion 22 extends towards radial outside.

From round plate 23, downside is prominent in the axial direction for protrusion 24.More specifically, in the present embodiment, protrusion 24 is from disk The outer end in portion 23 is prominent.In the present embodiment, the radial protrusion medial surface 24a of protrusion 24 is parallel with rotation axis RA. In this way, can be adjusted on protrusion medial surface 24a and the two faces of the lower surface of round plate 23 to balance when rotor 110 rotates Integeral part 25 is kept.Therefore, balanced adjustment component 25 steadily can be held in protrusion medial surface 24a.

In addition, the structure of protrusion medial surface 24a is not limited to the illustration.Fig. 4 is the other structures for showing protrusion medial surface 24a The cross-sectional view of the cover 2 of example.For example, it is also possible to which as shown in figure 4, protrusion medial surface 24a is Xiang Jing with the axial downside of direction Inclined inclined surface outward.In this way, balanced adjustment component 25 is easier to be set to protrusion medial surface 24a.

The 1st axial distance W1 in axial direction between the upper end of round plate 23 and the lower end of protrusion 24 is round plate 23 Upper end and annulus 26 upper end between axial direction on the 2nd axial distance W2 less than half (referring to Fig.1).This Sample, can not interfere the air across cover opening 2a is fluidly held in protrusion medial surface 24a for balanced adjustment component 25.

Balanced adjustment component 25 is the component for adjusting the spin balancing of rotor 110.In the present embodiment, balance is adjusted Integeral part 25 is such as using including the composite resin material including ceramic powders aluminium oxide.Balanced adjustment component 25 is than stator 120 are set to the radial protrusion medial surface 24a of protrusion 24 by axis position to the upper side.In this way, it is not easy to from the outside of cover 2 See balanced adjustment component 25.In addition, balanced adjustment component 25 is being set in protrusion than stator 120 by axis position to the upper side Side 24a.Therefore, with can not damaging appearance, while for example actually drive to assembled motor precision is good The spin balancing of rotor 110 is adjusted well.In addition, in the present embodiment, the following table of balanced adjustment component 25 and round plate 23 Face contact, but it is not limited to the illustration, it can also be separated with the lower surface of round plate 23.In other words, balanced adjustment component 25 can also To be set as that there is interval between the lower surface of round plate 23.

Annulus 26 is in the ring-type centered on rotation axis RA.Annulus 26 is located at than wall portion 28 by axis position to the upper side It sets and is located at the position than round plate 23 by axial downside.That is, annulus 26 is presented axially in wall portion 28 and round plate 23 Between.Annulus 26 in the circumferential links up multiple ribs 27.

In the present embodiment, rib 27 in the axial direction with radially extending plate.Rib 27 is by round plate 23 and ring-type It is connected between portion 26.Rib 27 is arranged with multiple in the circumferential.The quantity of rib 27 can be fewer than the quantity of protrusion tab 29 but excellent It is selected in the quantity of protrusion tab 29 or more.In other words, the quantity of rib 27 is preferably identical as the quantity of protrusion tab 29 or compares protrusion tab 29 quantity is more.If the stream of the air across cover opening 2a can be further enhanced more than the quantity of protrusion tab 29 It is dynamic.

Rib 27 at least than position of the round plate 23 on the downside of the axial direction in the axial direction with it is radially extending.More specifically, Rib 27 includes projected board 27a.From the lower surface of round plate 23, downside extends projected board 27a in the axial direction, and prolongs radially It stretches.In this way, the flowing of air can be generated via cover opening 2a between each rib 27 when rotor 110 rotates.In addition, Air is stirred by the projected board 27a of each rib 27, the flowing of air becomes strong.It is rotated by motor 100, it can be by such The flowing of air and effectively the inside of motor 100 is cooled down.

The radial inner end of each rib 27 can be connect with axis linking part 21 or output shaft 22, but preferably, until Few position than round plate 23 on the downside of axial direction has compartment of terrain opposed (referring to Fig. 3 B) radially with axis linking part 21. In other words, preferably, at least in arbitrary rib 27, the inner end of projected board 27a radially with axis linking part 21 and output Axle portion 22 separates, and does not connect with axis linking part 21 and output shaft 22.In this way, for example compared to the inner end and axis of each rib 27 The structure that linking part 21 connects, can make 100 lightweight of motor.Moreover, can reduce to form material used in rib 27, therefore It can reduce cost.

Next, being illustrated with further reference to Fig. 5 to wall portion 28 and protrusion tab 29.Fig. 5 is shown comprising wall portion 28 With the figure of the cross-sectional configuration including protrusion tab 29.In addition, Fig. 5 is corresponding with the part that the dotted line of Fig. 1 is surrounded.

From annulus 26, lower section extends wall portion 28 in the axial direction, positioned at the radially inner side of shell 1.Wall portion 28 is in rotation axis Ring-type centered on RA, extends in the circumferential.Wall portion 28 has the 1st wall portion 281 and the 2nd wall portion 282.

1st wall portion 281 is contacted with a part of the radial shell medial surface 1a of shell 1.1st wall portion 281 is in axial direction The tubular of upper extension.That is, shell medial surface 1a and the 1st lateral surface 281a are the faces extended in the axial direction.In this way, the 1st wall portion 281 become larger with the contact area of the inside face contact of shell 1, therefore the installation strength between the 1st wall portion 281 and shell 1 improves.

From the axial lower end of the 1st wall portion 281, downside extends 2nd wall portion 282 in the axial direction.2nd wall portion 282 is across bonding Agent 28a and it is opposed with shell medial surface 1a.In other words, the 2nd lateral surface 282a is bonded in shell medial surface 1a by bonding agent 28a On.

In the present embodiment, the 2nd wall portion 282 is in the ring-type centered on rotation axis RA.It is however not limited to the example Show, the 2nd wall portion 282 for example can also have gap and the circular arc centered on rotation axis RA in a part in the circumferential Shape.Alternatively, can also be using such as flowering structure: the 2nd wall portion 282 has multiple, and each 2nd wall portion 282 has interval in the circumferential Ground arrangement.

Radially, as shown in figure 5, the between the 1st lateral surface 281a and rotation axis RA of the 1st wall portion 281 the 1st is radial Distance L1 is greater than the 2nd radial distance L2 between the 2nd lateral surface 282a and rotation axis RA of the 2nd wall portion 282.In this way, covering It is provided with the 1st wall portion 281 in portion 2 and is bonded with the part contacted shell medial surface 1a and the 2nd wall portion 282 by bonding agent 28a Part on the 1a of side inside the shell.Thereby, it is possible to make to be applied to the load between shell 1 and cover 2 when rotor 110 rotates It is distributed to each section.Therefore, it is able to suppress and generates gap between the axial upper end and cover 2 of shell 1.

Specifically, when installing cover 2 to shell 1, such as compared to only by using the bonding of bonding agent 28a And cover 2 is installed on to the structure of shell 1, the 1st wall portion 281 further seamlessly contact with shell medial surface 1a and along Downside is guided shell medial surface 1a in the axial direction.Therefore, it is able to suppress between wall portion 28 and shell 1 and generates gap and more Cover 2 is easily installed on shell 1.In addition, the installation between the direction that wall portion 28 is extended and the direction that shell 1 is extended Angle is not allowed to be also easy to produce deviation.Moreover, cover 2 is not allowed to be also easy to produce deviation relative to the radial installation site of shell 1 yet.Cause This, can be such that cover 2 improves relative to the installation accuracy of shell 1.Thus, it is possible to make the balance quality of the rotor 110 when rotation It improves.

In the axial direction, the axial length D1 of the 1st wall portion 281 can be but excellent in the axial length D2 or more of the 2nd wall portion 282 Choosing as shown in FIG. 5, the axial length D2 of the axial length D1 of the 1st wall portion 281 less than the 2nd wall portion 282.If set like this For D1 < D2, then for example loaded compared to the construction that cover 2 is only installed on to by wall portion 28 with the contact of shell 1 shell 1 Stress is improved relative to the safety coefficient of the endurance of wall portion 28.In other words, be able to suppress be applied to wall portion 28 load increase and Improve cover 2 relative to the installation strength of shell 1.

Downside is prominent in the axial direction from the axial lower end of wall portion 28 for protrusion tab 29.More specifically, protrusion tab 29 from the 2nd Downside is prominent in the axial direction for the axial lower end of wall portion 282, is arranged in the circumferential multiple.Each protrusion tab 29 is configured at adjacent Magnet 3 between.In such manner, it is possible to which magnet 3 is positioned on circumferential and axial.In addition, protrusion tab 29 is not easy to apply from load The 2nd wall portion 282 lower end extend.Therefore, it can be improved the precision of position of the magnet 3 on circumferential and axial.

The quantity of protrusion tab 29 can be different from the quantity of magnet 3, but the quantity of the quantity of preferably protrusion tab 29 and magnet 3 It is identical.If it is identical quantity, then when cover 2 is installed on shell 1, each magnet 3 can be directed to protruding portion 29 it Between.Therefore, magnet 3 is easily installed at shell 1.

In addition, in each protrusion tab 29, when from end on observation, at least part and 27 weight of rib of the protrusion tab 29 It is folded.In this case, such as mold easy to use forms cover 2.

Next, being illustrated to the 1st variation of cover 2 and the 2nd variation.In addition, in the following description, mainly Structure different from the embodiment described above is illustrated.In addition, in each variation, to above embodiment and other changes The identical structural element of shape example marks identical label, omits and says with above embodiment and the identical structure of other variations It is bright.

Fig. 6 A is the perspective view for showing the motor 100 of the 1st variation of cover 2.Fig. 6 B is the cover for showing the 1st variation The cross-sectional view of 2 structure.

As shown in Figure 6 A and 6 B, the cover 2 of the 1st variation has cover opening 2a, axis linking part 21, output shaft 22, round plate 23, annulus 26, multiple ribs 27, wall portion 28 and multiple protrusion tabs 29.On the other hand, in the 1st variation, Cover 2 does not have the protrusion 24 of above embodiment, and each rib 27 does not have the projected board 27a of above embodiment.In this way, example Such as there is compared to each rib 27 structure of projected board 27a, 100 lightweight of motor can be made.Moreover, can reduce to form rib 27 Used material, therefore can reduce cost.

When from end on observation, at least one circumferential end of rib 27 is in the circumferential from the outside of rib 27 towards inner-concave It falls into.For example, in fig. 6, when from end on observation, the end of the circumferential side of rib 27 is from circumferential side towards the circumferential other side The end of recess, the circumferential other side of rib 27 is recessed from the circumferential other side towards circumferential side.In this way, the circumferential direction of cover opening 2a Width becomes much larger, therefore more air pass through cover opening 2a and flow.Therefore, the cooling efficiency of motor 100 improves.

In addition, the radial width of the round plate 23 of Fig. 6 is less than the round plate 23 in above embodiment (referring to Fig. 2 etc.) Radial width.In other words, the radial width of cover opening 2a is greater than the radial width of the cover opening 2a in above embodiment. In this way, the cooling efficiency of motor 100 further increases.

Fig. 7 A is the perspective view of the cover 2 of the 2nd variation.Fig. 7 B is the section view for showing the structure of cover 2 of the 2nd variation Figure.Fig. 7 C is the cross-sectional view for showing the other structures of cover 2 of the 2nd variation.

As shown in Fig. 7 A~Fig. 7 C, the cover 2 of the 2nd variation has cover opening 2a, axis linking part 21, output shaft 22, round plate 23, protrusion 24, balanced adjustment component 25, annulus 26, multiple ribs 27, wall portion 28 and multiple protrusion tabs 29.Separately On the one hand, in the 2nd variation, each rib 27 does not include the projected board 27a of above embodiment.In this way, for example compared to each A rib 27 includes the structure of projected board 27a, can make 100 lightweight of motor.Moreover, can reduce to form material used in rib 27 Material, therefore can reduce cost.In addition, the inner space of cover 2 becomes much larger.

Round plate 23 has plate portion 231, annulus 232 and upper opening 233.Plate portion 231 is outside axis linking part 21 Side extends to radial outside, positioned at the position for leaning on radially inner side than annulus 232.Annulus 232 is in be with rotation axis RA The ring-type at center is connect by multiple ribs 27 with plate portion 231 radially.In the axial direction, annulus 232 is located at than plate portion 231 lean on the position of axial downside.Upper opening 233 is set between multiple ribs 27 in circumferential direction and is set to plate radially Between portion 231 and annulus 232.In this way, air via upper opening 233 and cover 2 outwardly and inwardly between pass through, because The inside of this motor 100 is easier cooled.

From annulus 232, downside is prominent in the axial direction for protrusion 24.It is provided on the radial protrusion medial surface 24a of protrusion 24 Balanced adjustment component 25.Balanced adjustment component 25 can be separated with the lower surface of annulus 232, but preferably with annulus 232 Following table face contact.

The radial protrusion medial surface 24a of protrusion 24 can be parallel with rotation axis RA as shown in Fig. 7 B.In this way, Rotor 110 rotate when, on protrusion medial surface 24a and the two faces of the lower surface of annulus 232 to balanced adjustment component 25 into Row is kept, therefore balanced adjustment component 25 steadily can be held in protrusion medial surface 24a.

Alternatively, protrusion medial surface 24a can also be with towards axial downside and to radial outside as shown in Fig. 7 C Inclined inclined surface.In this way, balanced adjustment component 25 is easier to be set to protrusion medial surface 24a.

More than, the embodiments of the present invention is illustrated.In addition, the scope of the utility model be not limited to it is above-mentioned Embodiment.The utility model can apply in the range of not departing from the purport of utility model various changes and be implemented.This Outside, the item illustrated in the above-described embodiment can in the range of not generating contradiction suitably any combination.

The utility model for example can be used in being equipped with the motor of cover in the end of the axial side of shell.

Claims (9)

1. a kind of motor, includes

Rotor can be pivoted about with rotation axis；And

Stator drives the rotor,

The rotor includes

The shell of tubular；And

Cover is installed on the axial upper end of the shell,

The motor is characterized in that,

The wall portion that the cover has the radially inner side positioned at the shell and extends in the circumferential,

The wall portion includes

1st wall portion is contacted with a part of the radial shell medial surface of the shell；And

2nd wall portion, from the axial lower end of the 1st wall portion, downside extends in the axial direction,

The 1st distance radially between the 1st lateral surface and the rotation axis of 1st wall portion is greater than the 2nd wall portion The 2nd lateral surface and the rotation axis between the 2nd distance radially,

2nd lateral surface is opposed with the shell medial surface across bonding agent.

2. motor according to claim 1, which is characterized in that

1st wall portion is in the tubular extended in the axial direction.

3. motor according to claim 1, which is characterized in that

The axial length of 1st wall portion is less than the axial length of the 2nd wall portion.

4. motor according to claim 1, which is characterized in that

The cover also includes

Round plate extends centered on the rotation axis and radially；

Annulus centered on the rotation axis, and is located at than the wall portion by axial upside and than the disk Position of the portion by axial downside；

Rib will connect between the round plate and the annulus, in the axial direction with it is radially extending and in circumferential direction On be arranged with it is multiple；And

Cover opening, is set between the rib and is set between the round plate and the annulus.

5. motor according to claim 4, which is characterized in that

The rotor also have extend in the axial direction along the rotation axis and can centered on the rotation axis into The axis of row rotation,

The cover also has the axis linking part with axis connection,

The radial inner end of each rib is at least leaning on the position on the downside of axial direction and the axis linking part than the round plate Have compartment of terrain opposed radially.

6. motor according to claim 4, which is characterized in that

The rotor, which also has, to be configured at the shell medial surface and is arranged with multiple magnet in the circumferential,

The cover also has the lower end from the axial direction of the 2nd wall portion, and downside is prominent in the axial direction and is arranged in the circumferential Multiple protrusion tabs,

The protrusion tab configuration is between the adjacent magnet.

7. motor according to claim 6, which is characterized in that

The quantity of the rib is more than the quantity of the protrusion tab.

8. motor according to claim 6, which is characterized in that

The quantity of the magnet is identical as the quantity of the protrusion tab.

9. motor according to claim 7 or 8, which is characterized in that

When from end on observation, at least part of the protrusion tab is Chong Die with the rib.