CN102684328B - Motor - Google Patents

Abstract

The present invention provides motor.The shell keeping stator core has and is arranged in the outside cylindrical portion extended upward than the coil bottom closer to downside and the peripheral part from bottom.Stator core has the minor diameter part of the radially inner side being arranged in outside cylindrical portion and is arranged in and closer to the position of upside and has the large-diameter portion in substantially cylindric outer peripheral face bigger than the outer peripheral face diameter of minor diameter part than minor diameter part.And, the outer peripheral face of large-diameter portion exposes from shell.Therefore, it is possible to reduce due to shell contact the iron loss caused.It addition, the magnetic circuit in stator core can be expanded at large-diameter portion.Thereby, it is possible to reduce the iron loss of stator core itself.It is as a result, it is possible to improve the energy efficiency of motor.

Description

Motor

Technical field

The present invention relates to a kind of inner-rotor type motor.

Background technology

In the past, the inner-rotor type motor making the rotating part with Magnet rotate in the inner side of coil is well-known.Such as, Japanese Unexamined Patent Publication 2006-109575 publication is recorded and has included having the rotor of Magnet and be arranged in rotor outer periphery side The brushless motor of stator.Have by coil magnetization additionally, recorded in Japanese Unexamined Patent Publication 2008-283838 publication Stator core and the inner-rotor type motor of rotor rotatably supported relative to stator core.

Brushless motor in Japanese Unexamined Patent Publication 2006-109575 publication has has bottom surface and tubular cap to be used as using In the parts (paragraph 0003, paragraph 0039, Fig. 1) keeping stator.And, outside this cap covering stator is unshakable in one's determination Side face.Therefore, in the structure of Japanese Unexamined Patent Publication 2006-109575 publication, produce near the outer peripheral face of stator core The raw iron loss caused owing to contacting with cap.

According to the purposes of motor, the reduction of the energy efficiency that adjoint iron loss produces is in the range of allowing.But, The motor providing higher quality is accomplished by reducing the iron loss caused due to cap.

On the other hand, in Japanese Unexamined Patent Publication 2008-283838 publication, protecgulum and bonnet for fixed stator only cover Near both ends in the outer peripheral face of lid stator core (paragraph 0015, Fig. 1).But, Japanese Unexamined Patent Publication 2008-283838 In the stator core of number publication, have single part and the part both sides being not covered with covered by protecgulum or bonnet External diameter.It is to say, in Japanese Unexamined Patent Publication 2008-283838 publication, the external diameter of stator core is not according to horse The external diameter reached is set effectively.Just because of this, it may be considered that the iron loss of stator core itself is bigger.

Summary of the invention

It is an object of the present invention to provide the motor of a kind of energy efficiency that can be improved motor by minimizing iron loss.

The motor of the 1st aspect that the application illustrates has stationary part and revolves centered by the central axis vertically extended The rotating part turned, described rotating part has the axle configured along described central axis, the rotor retainer being fixed on described axle Be fixed on the Magnet of described rotor retainer, described stationary part has: be arranged in the line of the radial outside of described Magnet Circle；There is the stator core of multiple teeth of the magnetic core becoming described coil；Keep described stator core metal outside Shell；With support described axle make this axle be rotatable bearing portion, described shell have be arranged in than described coil closer to The outside cylindrical portion that the bottom of position of downside and the peripheral part from described bottom extend upward, described stator core has Have: be arranged in the minor diameter part of the radially inner side in described outside cylindrical portion；And large-diameter portion, it is described that this large-diameter portion is arranged in ratio Minor diameter part is closer to the position of upside, and has bigger than the outer peripheral face diameter of described minor diameter part in outside substantially cylindric Side face, the outer peripheral face of described large-diameter portion exposes from described shell.

The 1st aspect illustrated according to the application, the outer peripheral face of large-diameter portion does not contacts with shell.Therefore, it is possible to reduce by The iron loss caused in shell.It addition, the magnetic circuit in stator core can be expanded at large-diameter portion.Thereby, it is possible to subtract The iron loss of few stator core itself.It is as a result, it is possible to improve the energy efficiency of motor.

Accompanying drawing explanation

Fig. 1 is the profilograph of motor.

Fig. 2 is the stereoscopic figure of motor.

Fig. 3 is the profilograph of motor.

Fig. 4 is the axonometric chart of stator core.

Fig. 5 is the upward view of stator core.

Fig. 6 is the partial bottom view of stator core.

Fig. 7 is the partial longitudinal section of the motor of variation.

Fig. 8 is the profilograph of the motor of variation.

Fig. 9 is the profilograph of the motor of variation.

Figure 10 is the profilograph of the motor of variation.

(symbol description)

1,1A, 1B, 1C, 1D, 1E motor

2,2A stationary part

3,3A, 3E rotating part

9,9A central axis

21,21A, 21B, 21C, 21D shell

22,22A, 22B stator core

23,23A coil

Insulating element on 24

25 times insulating elements

26,26E circuit substrate

27,27A, 27C, 27D bearing portion

29C bearing cage part

31,31A, 31E axle

32,32A rotor retainer

33 rotor magnets

33A Magnet

41,41A minor diameter part

42,42A large-diameter portion

43,43B step surface

51 the 1st groove portions

52,53 the 2nd groove portion

211, bottom 211A, 211D

212,212A, 212B outside cylindrical portion

213 inside cylindrical portions

221 rear of cores

222,222A tooth

241 annulus

242 steady pins

511,512 groove face

513 inner ends

521,531 inner face

Detailed description of the invention

Hereinafter, referring to the drawings embodiment illustrated of the present invention is illustrated.Hereinafter, by the central axis along motor Direction be referred to as above-below direction, by the large-diameter portion side of the minor diameter part relative to stator core be referred to as on, each several part is described Shape and position relationship.But this explanation merely for convenience and the above-below direction that defines, do not limit the horse of the present invention Reach posture in use.

<the 1. motor of an embodiment>

Fig. 1 is the profilograph of the motor of one embodiment of the present invention.As it is shown in figure 1, motor 1A has static Portion 2A and rotating part 3A.Rotating part 3A rotates centered by the central axis 9A vertically extended.

Rotating part 3A has axle 31A, rotor retainer 32A and Magnet 33A.Axle 31A joins along central axis 9A Put.Rotor retainer 32A is fixed on axle 31A.Magnet 33A is fixed on rotor retainer 32A.

Stationary part 2A has shell 21A, stator core 22A, coil 23A and bearing portion 27A.Coil 23A joins Put the radial outside at Magnet 33A.Stator core 22A has multiple tooth 222A of the magnetic core becoming coil 23A. Shell 21A is the metal parts keeping stator core 22A.Bearing portion 27A support shaft 31A makes this axle 31A Rotatable.

Shell 21A has bottom 211A and outside cylindrical portion 212A.Bottom 211A is arranged in than coil 23A more Position near downside.Outside cylindrical portion 212A extends upward from the peripheral part of bottom 211A.

Stator core 22A has minor diameter part 41A and large-diameter portion 42A.Minor diameter part 41A is arranged in outside cylindrical portion 212A Radially inner side.Large-diameter portion 42A is arranged in than minor diameter part 41A closer to the position of upside.Large-diameter portion 42A has The diameter of the diameter outer peripheral face than the minor diameter part 41A outer peripheral face more greatly and in substantially cylindrical shape.Further, large-diameter portion 42A Outer peripheral face expose from shell 21A.

So, in the present embodiment, shell 21A does not contacts with the outer peripheral face of large-diameter portion 42A.Therefore, it is possible to Suppress magnetic flux from stator core 22A to the leakage of shell 21A.Therefore, the iron loss of stator core 22A reduces. It addition, the magnetic circuit in stator core 22A is extended at large-diameter portion 42A.Therefore, the ferrum of stator core 22A itself Loss also reduces.Its result, the energy efficiency of motor 1A improves.

<the most more specifically embodiment>

<being monolithically fabricated of 2-1. motor>

It follows that the more specifically embodiment about the present invention illustrates.

The motor of present embodiment is mounted in the such as family such as air-conditioning or refrigerator electrical article, by the driving source as fan or pump Use.But the motor of the present invention is alternatively the motor for other purposes.The motor of the such as present invention also can be mounted in OA (Office Automation: office automation) equipment, armarium, automobile etc., produce various driving force. Hereinafter, the equipment carrying motor 1 is referred to as " driving means ".

Fig. 2 is the stereoscopic figure of the motor 1 of present embodiment.Fig. 3 is the profilograph of motor 1.Such as Fig. 2 Shown in Fig. 3, motor 1 has stationary part 2 and rotating part 3.Stationary part 2 is fixed on the framework of driving means.Rotation Transfer part 3 can be pivotally supported relative to stationary part 2.

The stationary part 2 of present embodiment have shell 21, stator core 22, coil 23, upper insulating element 24, under Insulating element 25, circuit substrate 26 and bearing portion 27.

Shell 21 keeps stator core 22 and bearing portion 27.Shell 21 is metal parts.Shell 21 has the end Portion 211, outside cylindrical portion 212, inside cylindrical portion 213 and circular protrusion 214.Bottom 211 is at coil 23 Radially (the direction orthogonal with central axis, lower direction.The most same) extend, position in substantially planar.Outward Side cylindrical portion 212 is that the peripheral part from bottom 211 extends upward, in substantially cylindric position.Inside cylindrical Portion 213 is that the radially inner side in bottom 211 extends upward, in substantially cylindric position.Circular protrusion 214 For the position highlighted downwards from bottom 211 between bottom 211 and inside cylindrical portion 213.Install in driving means The when of motor 1, circular protrusion 214 is entrenched in the framework of driving means.Thereby, it is possible to easily to motor 1 Position with driving means.

Shell 21 is made up of the metal of non-electromagnetic steel plate.The shell 21 of present embodiment is by with ferrum as main component Alloy sheets punch process and formed.It is to say, shell 21 is to have bottom 211, outside cylindrical portion 212, interior Side cylindrical portion 213 and the single punch process product of circular protrusion 214.Punch process and casting, cutting etc. other add Work method is compared, and is more suitable for producing in a large number.It addition, in the present embodiment, by the shell 21 of single part Keep stator core 22 and bearing portion 27.Therefore, it is possible to by the most high-precision to stator core 22 and axle described later 31 Degree ground positions.

Stator core 22 and coil 23 are the positions of the armature function as motor 1.Stator core 22 is by silicon The electromagnetic steel plates such as steel disc are in the axially (direction along central axis 9.The most same) it is laminated the laminate steel shape obtained Become.Stator core 22 has circular rear of core 221 and prominent many to radially inner side from rear of core 221 Individual tooth 222.Rear of core 221 is kept by the outside cylindrical portion 212 of shell 21.

Coil 23 is made up of the wire being wound on around tooth 222.When providing driving electric current to coil 23, in conduct The tooth 222 of magnetic core produces magnetic flux radially.Further, between due to the rotor magnet 33 of tooth 222 and rotating part 3 side The effect of magnetic flux, produce circumference torque.Its result, relative to stationary part 2, rotating part 3 with central axis 9 is Central rotation.

Upper insulating element 24 and lower insulating element 25 are to make stator core 22 and the resin parts of coil 23 electric insulation. Upper insulating element 24 is arranged in the upside of stator core 22.Lower insulating element 25 is arranged in the downside of stator core 22. In other words, between upper insulating element 24 and lower insulating element 25, hold stator core 22.

Upper insulating element 24 and lower insulating element 25 have between tooth 222 and coil 23 and make tooth 222 and line Enclose the part of 23 electric insulations.It addition, upper insulating element 24 has circumferentially continuous at the radial outside of coil 23 Annulus 241.Annulus 241 is arranged in the top of large-diameter portion 42 and is arranged in the radial outside of coil 23.At ring The upper surface in shape portion 241, is provided with multiple substrate securing part for permanent circuit substrate 26.Present embodiment Substrate securing part is the steady pin 242 axially extended.

Circuit substrate 26 is for being equipped with the substrate for providing the electronic loop driving electric current to coil 23.Circuit substrate The upper surface of 26 annulus 241 being fixed on insulating element 24.Specifically, consolidating upper insulating element 24 Rationed marketing 242 is inserted in the through hole being arranged on circuit substrate 26, and the upper end of steady pin 242 is welded on circuit The upper surface of substrate 26.It addition, at the lower surface of circuit substrate 26, be provided with the rotating speed for detecting rotating part 3 Magnetic Sensor 261.Magnetic Sensor 261 can use such as Hall element.

Bearing portion 27 makes this axle 31 rotate mechanism freely for being used for supporting the axle 31 of rotating part 3.Bearing portion 27 It is maintained at the inner peripheral surface in the inside cylindrical portion 213 of shell 21.Bearing portion 27 can use such as by spheroid make outer ring and The ball bearing that inner ring rotates against.Bearing portion 27 is used as the axle of other modes such as sliding bearing or FDB Hold.

The rotating part 3 of present embodiment has axle 31, rotor retainer 32, multiple rotor magnet 33 and sense magnets 34。

Axle 31 is the generally cylindrical parts vertically extended along central axis 9.Axle 31 is by above-mentioned bearing Portion 27 rotates while supporting centered by central axis 9.The bottom of axle 31 is prominent to the lower section of shell 21. It addition, protruding above to circuit substrate 26 of the upper end of axle 31.Gear is passed through in bottom or the upper end of axle 31 The drive division of driving means it is attached at Deng Poewr transmission mechanism.

Rotor retainer 32 is the parts rotated together with axle 31 at the radially inner side of stator core 22 and coil 23. The rotor retainer 32 of present embodiment is formed being axially laminated the laminate steel obtained by electromagnetic steel plates such as stalloys. Rotor retainer 32 has flat part 321 and cylindrical portion 322.Flat part 321 is the footpath, upper direction at bearing portion 27 To the most discoideus position extended.The inner peripheral portion of flat part 321 is fixed on the outer peripheral face of axle 31.Cylindrical portion 322 It is that the peripheral part from flat part 321 extends downwards and in substantially cylindric position.

In the present embodiment, rotor retainer 32 to be shaped as lid substantially cylindric, flat part 321 times Side and cylindrical portion 322 radially inner side configure bearing portion 27.Therefore, it is possible at the height and position by bearing portion 27 While the center of gravity of motor 1 is close, merely with shell 21 support shaft bearing portion 27.

Multiple rotor magnets 33 are fixed on the outer peripheral face of the cylindrical portion 322 of rotor retainer 32.Each rotor magnet 33 The face of radial outside become the magnetic pole strength opposed with stator core 22 and coil 23.Multiple rotor magnet 33 is with N The magnetic pole strength of pole and the alternately arranged mode of the magnetic pole strength of S pole equally spaced arrange in circumference.It addition, replace multiple turns Sub-Magnet 33, it is possible to use N pole and S pole in circumference by the cylindric Magnetitum of alternating magnetization.

Sense magnets 34 is fixed on the upper surface of the flat part 321 of rotor retainer 32.In sense magnets 34, with The spacing thinner than rotor magnet 33 arranges magnetic pole.When this motor 1 works, the magnetic sensing of foregoing circuit substrate 26 Device 261 detects the magnetic pole of sense magnets 34.Circuit substrate 26 accepts the detection signal from Magnetic Sensor 261, essence Thickly while the rotating speed of detection rotating part 3, control to flow to the driving electric current of coil 23.

<2-2. is about the minor diameter part of stator core and large-diameter portion>

It follows that the more detailed structure about stator core 22 illustrates.Fig. 4 is the solid of stator core 22 Figure.Fig. 5 is the upward view of stator core 22.The section of the stator core 22 in Fig. 3 is equivalent in Fig. 5 from III-III The section that position is seen.

As shown in Figures 2 to 5, stator core 22 includes minor diameter part 41 and the large-diameter portion bigger than minor diameter part 41 external diameter 42.Minor diameter part 41 has substantially cylindric outer peripheral face, and the footpath being pressed into the outside cylindrical portion 212 to shell 21 is inside Side.It is to say, minor diameter part 41 is fixed on the inner peripheral surface in outside cylindrical portion 212.Large-diameter portion 42 is arranged in and compares path Portion 41 is closer to the position of top.Large-diameter portion 42 has bigger than the outer peripheral face diameter of minor diameter part 41 and in substantially cylinder The outer peripheral face of shape.

The outer peripheral face of large-diameter portion 42 is not covered by outside cylindrical portion 212, exposes from shell 21.It is to say, with outward All situations of the outer peripheral face of shell 21 covering stator iron core 22 are compared, in present embodiment, and stator core 22 He The opposing area of shell 21 is little.Accordingly, it is difficult to occur from the outer peripheral face of large-diameter portion 42 to the flux leakage of shell 21. Thus it is possible to reduce the iron loss caused due to shell 21, improve the energy efficiency of motor 1.

It addition, the periphery of large-diameter portion 42 projects to identical with the outer peripheral face in outside cylindrical portion 212 towards radial outside Radial position.Therefore, compared with not having this prominent situation, the magnetic circuit in rear of core 221 radially expands. Thereby, it is possible to the magnetic saturation of suppression stator core 22, reduce the iron loss of the rear of core 221 self of large-diameter portion 42. Therefore, it is possible to more improve the energy efficiency of motor 1.

If it addition, the external diameter of large-diameter portion 42 becomes big, then district can also be formed at the magnetic circuit in maintaining stator core 22 While the size of territory, expand the internal diameter of stator core 22.If the internal diameter of stator core 22 becomes big, then rotating part 3 Radial dimension the most correspondingly increase stator core 22 internal diameter increase size.In such manner, it is possible to improve rotating part 3 Torque.

Large-diameter portion 42 also can project to the outer peripheral face than outside cylindrical portion 212 closer to the position of radial outside.But, If as in the present embodiment, the outer peripheral face of large-diameter portion 42 and the outer peripheral face in outside cylindrical portion 212 being arranged in phase Same radial position, then can suppress the maximization of motor 1 and the concavo-convex of outer peripheral face.

The outer peripheral face of the minor diameter part 41 in the outside cylindrical portion 212 of shell 21 only covering stator iron core 22.Therefore, Compared with the situation all with the outer peripheral face of covering stator iron core 22, the axial length in outside cylindrical portion 212 shortens.By This, while reducing the material of shell 21, the processing of shell 21 becomes easy.Particularly as present embodiment this Sample shell 21 is the situation of punch process product, and the length in the outside cylindrical portion 212 being processed to form by drawing is shorter, The easness of processing so can be significantly increased.

It addition, the stator core 22 of present embodiment is at the outer peripheral face of the outer peripheral face of minor diameter part 41 and large-diameter portion 42 Boundary has step surface 43.And, this step surface 43 contacts with the upper end in outside cylindrical portion 212.Therefore, Stator core 22 is determined relative to the axial location of shell 21.Manufacturing motor 1 when, it is pressed into stator core 22 until step surface 43 contacts with the upper end in outside cylindrical portion 212.Therefore, the tool of location is not used Just stator core 22 axially can positioned.

The axial size of stator core 22 sets according to the characteristic of required motor 1.Now, if kept The constant dimension of minor diameter part 41, and increase and decrease the size of large-diameter portion 42, it is possible in the feelings of the size not changing shell 21 The axial size of stator core 22 is changed under condition.If it is to say, using the stator core 22 of present embodiment Structure, it is possible to same shell 21 is used for multiple stator core 22.

It addition, the stator core 22 of Fig. 3 to Fig. 5 is the axial dimension axial chi than minor diameter part 41 of large-diameter portion 42 The example of the very little minimizing effect greatly and more paying attention to iron loss.Improve while intentionally getting the minimizing effect of iron loss In the case of the fixing intensity of shell 21 and stator core 22, it is possible to the axial dimension of minor diameter part 41 is set as ratio The axial dimension of large-diameter portion 42 is big.

It addition, in the present embodiment, above large-diameter portion 42, it is configured with the annulus of insulation division material 24 241.And, at the upper surface of this annulus 241, it is provided with the steady pin 242 for permanent circuit substrate 26. Therefore, compared with the radially projecting situation that there is not large-diameter portion 42, it is possible to expand the external diameter of annulus 241.Institute With, it is possible to steady pin 242 is arranged in the position closer to radial outside.It is as a result, it is possible to radially the most true Protect the space of configuration coil 23, increase the number of turn of coil 23.

<2-3. is about the groove portion of stator core>

As shown in Fig. 2, Fig. 4 and Fig. 5, the outer peripheral face in stator core 22 is provided with a 1st groove portion 51 and two Individual 2nd groove portion 52,53.These groove portions 51 to 53 are used for when making stator core 22 accurately to external diameter The electromagnetic steel plate that size is different is radially and circumferentially positioning.

1st groove portion 51 axially extends at whole minor diameter part 41 and large-diameter portion 42 both sides.1st groove portion 51 have with Two groove faces 511,512 that the minor diameter part 41 of stator core 22 and the outer peripheral face of large-diameter portion 42 intersect, along with towards Radially inner side, the width of the circumference in the 1st groove portion 51 gradually collects bunchy.During it is to say, overlook, in V shape V-shaped valley.The collection bunchy portion i.e. inner end 513 near radially inner side in the 1st groove portion 51 is positioned at and compares minor diameter part The outer peripheral face of 41 is closer to the position of radially inner side.And, this inner end 513 is at whole minor diameter part 41 and large-diameter portion 42 both sides axially extend.

Two the 2nd groove portions 52,53 axially extend at the outer peripheral face of large-diameter portion 42.Each the 2nd groove portion 52,53 It is radially oriented inner side from the outer peripheral face of large-diameter portion 42, when overlooking, the shape of rectangular depression.2nd groove portion 52, The interface of the radially inner side of 53 i.e. inner face 521,531 is arranged on the radial direction position identical with the outer peripheral face of minor diameter part 41 Put.Therefore, there is not step in the outer peripheral face of this inner face 521,531 and minor diameter part 41, the most continuous.

When making stator core 22, on the basis of the 1st groove portion 52,53 of groove portion the 51 and the 2nd, to multiple Electromagnetic steel plate positions, and is laminated each electromagnetic steel plate.During lamination, the tool contact making to axially extend the 1 groove portion 52 of groove portion the 51 and the 2nd, is laminated electromagnetic steel plate.By making tool contact each groove portion 51 to 53, come Multiple electromagnetic steel plates are positioned coaxially.It addition, by making in the groove face 511,512 in the 1st groove portion 51 extremely A few side contacts the tool axially extended, it is possible to by the circumferential position of multiple electromagnetic steel plates whole minor diameter part 41 He Large-diameter portion 42 both sides align.It is to say, the groove face 511,512 in the 1st groove portion 51 becomes for multiple electromagnetism Steel plate carries out the datum level positioned in circumference.

The most in the present embodiment, the inner end 513 in the 1st groove portion 51 is at whole minor diameter part 41 and large-diameter portion 42 both sides, away from the constant distance of central axis 9.It addition, inner face 521,531 and in the 2nd groove portion 52,53 The outer peripheral face of minor diameter part 41 becomes the equidistant continuous print face away from central axis 9.It is to say, in this enforcement In mode, it is being configured with the circumferential position in groove portion 51 to 53, is having whole minor diameter part 41 and large-diameter portion 42 both sides The same footpath portion of the constant distance away from central axis 9.Therefore, the tool contacting these groove portions 51 to 53 can use edge The tool axially extended straight.

But, on the basis of utilizing groove portion 51 to 53 to position, there is above-mentioned same footpath portion not necessarily condition. Such as, in the 1st groove portion 51, the radial position of inner end 513 is non-constant, or the inner face in the 2nd groove portion 52,53 521, in the case of the radial position of 531 is different with the radial position of the outer peripheral face of minor diameter part 41, if used with each The tool that the shape in groove portion is corresponding, it becomes possible to multiple electromagnetic steel plates are positioned.

Fig. 6 is the partial bottom view of stator core 22.As shown in Figure 6, near the base end part of tooth 222, at tooth Between 222 and rear of core 221, changing towards in substantially arc-shaped of magnetic flux 60.Therefore, the cardinal extremity of tooth 222 The position of the radial outside in portion becomes the place that magnetic flux 60 difficulty is passed through.In the present embodiment, at such tooth 222 Base end part radial outside configuration three groove portions 51 to 53.Thereby, it is possible to while the suppression impact on magnetic circuit Groove portion 51 to 53 is set.

It addition, the 1st groove portion 51 and two the 2nd groove portions 52,53 can distinguish in appearance mutually.Therefore, three The outward appearance in groove portion 51 to 53, first and last, becomes rotation asymmetry on the basis of central axis 9.Therefore, assembling The when of motor 1, it is possible on the basis of the position in these groove portions 51 to 53, determine the circumferential position of stator core 22 Put.

Additionally, such as present embodiment, apparent rotation asymmetry can pass through the 1st groove portion 52 of groove portion the 51 and the 2nd, The shape difference of 53 realizes, it is possible to realized by labellings such as coloring or markings.Additionally, it is possible to by multiple grooves The configuration of the circumference in portion realizes apparent rotation asymmetry.Such as, it is possible to by by stator core 22 Outer peripheral face is while the equal distribution position of circumference decile configures multiple groove portions, in the position deviateed from such distributing position Configure another groove portion to realize apparent rotation asymmetry.

3. variation

Above, it is illustrated about embodiment illustrated of the present invention, but the present invention is not limited to above-mentioned embodiment party Formula.

Fig. 7 is the partial longitudinal section of the motor 1B of a variation.In the example in figure 7, the outside of shell 21B The upper end of cylindrical portion 212B and the step surface 43B of stator core 22B are in axial separation.This way, it is not necessary to outside Xian Zhiing Shell 21A and the mutual alignment of stator core 22B, it is possible to it is fixed to carry out shell 21A and stator core 22B individually Position.

Fig. 8 is the profilograph of the motor 1C of other variation.In the example of fig. 8, it is provided with and shell 21C Bearing cage part 29C for different parts.And, bearing portion 27C is kept by bearing cage part 29C.? In the example of Fig. 8, it is not provided with inside cylindrical portion 213 as embodiment described above and ring-type prominent at shell 21C Play 214.The bearing cage part 29C of Fig. 8 has inside cylindrical portion 291C and from inside cylindrical portion 291C The flange part 292C extended to radial outside in end.Flange part 292C is fixed on shell 21C.Like this, the most not Need to form inside cylindrical portion at shell 21C, therefore simplify the shape of shell 21C self.Therefore, shell 21C Manufacture become easy.Particularly in the case of shell 21C is punch process product, due to by drawing sequence The height at the position erected reduces, so punch process becomes easy.

Fig. 9 is the profilograph of the motor 1D of other variation.In the example of figure 9, it is not provided with at shell 21D Circular protrusion 214 as embodiment described above.Therefore, the end than shell 21D, the bottom of bearing portion 27D Portion 211D highlights downwards.When the motor 1D of Fig. 9 is arranged on driving means, bearing portion 27D is entrenched in and drives The framework of dynamic device.Owing to omitting circular protrusion 214, the correspondingly shape simplification of shell 21D self, so shell The manufacture of 21D becomes easy.

Figure 10 is the profilograph of the motor 1E of other variation.In the example of Figure 10, replace sense magnets 34, Upper surface side at circuit substrate 26E arranges encoder 28E.Encoder 28E has and is arranged on circuit substrate 26E The test section 281E of upper surface and the tested drafting board 282E being arranged on axle 31E.It is provided with at tested drafting board 282E Multiple slits of circumferential array.Test section 281E examines by being detected optically by multiple slits of tested drafting board 282E Survey the rotating speed of rotating part 3E.

It addition, as other variation, the outer peripheral face of large-diameter portion 42 also can have the region that local is covered by shell 21. But, as embodiment described above, the situation that the outer peripheral face of large-diameter portion 42 exposes from shell 21 at complete cycle more can press down The deviation of the magnetic characteristic near the outer peripheral face of large-diameter portion 42 processed.

It addition, the boundary of the outer peripheral face of the outer peripheral face of minor diameter part 41 and large-diameter portion 42, both can be such as above-mentioned enforcement The step surface 43 of mode, it is also possible to for smoothly continuous print curved surface.

It addition, minor diameter part 41 also can indirectly be fixed on the inner peripheral surface in outside cylindrical portion 212 by miscellaneous part.But It is, as embodiment described above, if minor diameter part 41 is directly anchored to the inner peripheral surface in outside cylindrical portion 212, energy Enough minor diameter parts 41 that the most more improves are relative to the fixing intensity in outside cylindrical portion 212 and positioning precision.

Lower insulating element 25 both can be fixed on stator core 22 by coil 23, it is possible to is pressed in the outside of shell 21 The inner side of cylindrical portion 212.It addition, lower insulating element 25 both can leave the end of shell 21 as embodiment described above Portion 211, it is possible to contact with the bottom 211 of shell 21.

The quantity in the groove portion being arranged on the outer peripheral face of stator core 22 both can be 1-2, it is possible to is more than 4.Example As, the 1st groove portion of more than 2 can be set at the outer peripheral face of stator core 22.It addition, the shape in groove portion can be The shape different with above-mentioned embodiment.It addition, replace above-mentioned groove portion 51 to 53, or with above-mentioned groove portion 51 to 53 together, and the outer peripheral face in stator core 22 arranges the multiple protuberances axially extended.If at such multiple grooves In portion or multiple protuberance, intersect with the outer peripheral face of stator core 22 including at least one and at whole minor diameter part and big The datum level that footpath portion both sides extend, then can utilize this datum level to position multiple electromagnetic steel plates.

It addition, for circuit substrate 26 being fixed on the fixing means of upper insulating element 24 both such as above-mentioned embodiment party The welding of the steady pin 242 of formula, it is possible to be to utilize pawl locking or bonding.

It addition, each key element occurred in above-mentioned embodiment or variation can be appropriately combined in the scope not producing contradiction.

The present invention can be used in the motor of inner-rotor type.

Claims (13)

1. a motor, this motor includes stationary part and rotating part, and more than this rotating part the central axis of lower extension is Central rotation, wherein,

Described rotating part has:

The axle configured along described central axis；

It is fixed on the rotor retainer of described axle；And

It is fixed on the Magnet of described rotor retainer,

Described stationary part has:

It is arranged in the coil of the radial outside of described Magnet；

Stator core, it has multiple teeth of the magnetic core becoming described coil；

Keep the metal shell of described stator core；And

Supporting described axle makes this axle be rotatable bearing portion,

Described shell has:

It is arranged in than described coil closer to the bottom of the position of downside；And

The outside cylindrical portion extended upward from the peripheral part of described bottom,

Described stator core has:

It is arranged in the minor diameter part of the radially inner side in described outside cylindrical portion；And

Large-diameter portion, this large-diameter portion is arranged in than described minor diameter part closer to the position of upside, and has than described minor diameter part Outer peripheral face diameter big in substantially cylindric outer peripheral face,

The diameter of the inner peripheral surface of described minor diameter part is identical with the diameter of the inner peripheral surface of described large-diameter portion,

The outer peripheral face of described large-diameter portion exposes from described shell, the periphery of described large-diameter portion project to towards radial outside and The radial position that the outer peripheral face in described outside cylindrical portion is identical,

Described stationary part also has to be made the insulating element of described stator core and described coil insulation and is fixed on described The circuit substrate of insulating element,

Described insulating element is made up of upper insulating element and lower insulating element, and described upper insulating element is configured at described stator Upside unshakable in one's determination, described lower insulating element is configured at the downside of described stator core, and described upper insulating element is at described line The radial outside of circle has at circumferentially continuous annulus, and the upper surface at described annulus has for fixing described electricity The steady pin of base board, described annulus is positioned at the top of described large-diameter portion, and the lower surface at described circuit substrate has For detecting the Magnetic Sensor of the rotating speed of described rotating part.

2. motor as claimed in claim 1, wherein,

Described minor diameter part is fixed on the inner peripheral surface in described outside cylindrical portion.

3. motor as claimed in claim 1, wherein,

Described stator core is formed by the laminate steel being laminated up and down,

Described stator core has the datum level that the outer peripheral face with described stator core intersects,

Described datum level extends at whole described minor diameter part and described large-diameter portion both sides.

4. motor as claimed in claim 3, wherein,

At the outer peripheral face of described stator core, it is provided with the multiple groove portions or multiple protuberance axially extended,

At least one at least one or the plurality of protuberance in the plurality of groove portion has described datum level.

5. motor as claimed in claim 4, wherein,

Described stator core is being configured with the plurality of groove portion or the circumferential position of the plurality of protuberance, has in whole institute State minor diameter part and the same footpath portion of the described large-diameter portion both sides constant distance away from central axis.

6. motor as claimed in claim 4, wherein,

Described groove portion or described protuberance are arranged on the radial outside of the base end part of described tooth.

7. motor as claimed in claim 4, wherein,

The outward appearance of the plurality of groove portion or the plurality of protuberance becomes rotation asymmetry on the basis of described central axis.

8. the motor as described in any one in claim 1 to 7, wherein,

The outer peripheral face of described large-diameter portion exposes from described shell at complete cycle.

9. the motor as described in any one in claim 1 to 7, wherein,

Described shell is to have described bottom, described outside cylindrical portion and keep the list in inside cylindrical portion of described bearing portion The punch process product of one.

10. motor as claimed in claim 9, wherein,

Described shell, between described bottom and described inside cylindrical portion, also has the ring highlighted downwards from described bottom Shape projection.

The motor as described in any one in 11. such as claim 1 to 7, wherein,

Described shell is punch process product,

This motor is provided with and the bearing cage part keeping described bearing portion that described shell is different parts.

The motor as described in any one in 12. such as claim 1 to 7, wherein,

Described stator core has step surface at the boundary of described minor diameter part and described large-diameter portion,

The upper end in described outside cylindrical portion contacts with described step surface.

The motor as described in any one in 13. such as claim 1 to 7, wherein,

Described stator core has step surface at the boundary of described minor diameter part and described large-diameter portion,

The upper end in described outside cylindrical portion and described step surface are in axial separation.