CN104882977B

CN104882977B - Motor stator and its manufacturing method

Info

Publication number: CN104882977B
Application number: CN201410773024.0A
Authority: CN
Inventors: 吉田达也; 新井康之; 山本圣
Original assignee: Nidec Techno Motor Corp
Current assignee: Nidec Techno Motor Corp
Priority date: 2014-02-28
Filing date: 2014-12-12
Publication date: 2019-04-16
Anticipated expiration: 2034-12-12
Also published as: JP6463895B2; CN204334137U; JP2015163014A; CN104882977A

Abstract

The present invention relates to a kind of motor stator and its manufacturing methods, the stator has the insulating part (5) that more than two segmentation iron cores (20) are connected the stator core to be formed (2) and are integrally formed by insert-molding with stator core (2) by iron core interconnecting piece (21), segmentation iron core (20) is with yoke portion (2y) circumferentially and the teeth portion (2t) extended from yoke portion (2y) towards radially inner side, insulating part (5) includes the tooth insulation division (53) of the coil fitting surface (2w) of covering teeth portion (2t) and the yoke insulation division (51) for covering the upper surface of yoke portion (2y) and the upper surface of iron core interconnecting piece (21).Therefore, stator core (2) does not expose at the upper surface of yoke portion (2y) and the upper surface of iron core interconnecting piece (21), can prevent connecting line (4) from contacting with stator core (2).

Description

Motor stator and its manufacturing method

Technical field

The present invention relates to a kind of motor stator and its manufacturing method, say that being related to one kind has and can be bent in further detail Band-like stator core motor stator improvement.

Background technique

In inner-rotor type motor, the stator of tubular shape is configured in the radial outside of rotor.Stator is by soft magnetism The stator core that material is formed is equipped with coil, and iron core and spiral are insulated by the insulating part of resin.Iron core is by justifying The core-back of ring-shaped and inner peripheral surface from core-back are constituted towards radially inner side more than two teeth portion outstanding, and Coil is equipped on the coil fitting surface of teeth portion.

As such iron core, the band-like iron core that there is known a kind of in the past with substantially rectilinear form is (for example, Japan is public Open bulletin 2003-329486 bulletin).The band-like iron core recorded in Japanese Kokai 2003-329486 bulletin It is that more than two segmentation iron cores are connected into what substantially linear was constituted by the iron core interconnecting piece that can be bent.Divide iron Core has a pair of of yoke portion and teeth portion, if bent iron core interconnecting piece after assembling coil, and by the two of iron core interconnecting piece End connection, it will be able to obtain the stator of tubular shape.

Insulating part is synthetic resin.The installation method of insulating part is considered to be formed as the component seperated with iron core The method for being installed to the method for iron core afterwards and being formed as one by insert-molding and iron core.

If forming insulating part by insert-molding, with phase the case where formed insulating part as seperated component Than the installation work-hour that can reduce insulating part.Also, even if insulating part shape for each segmentation iron core different feelings Will not occur setup error under condition.If also, insert-molding, then the shape that there is insulating part is determined by mold, not by iron The advantages of influence of the dimensional tolerance of core.

However, being generated if also forming resin on the involutory surface of adjacent segmentation iron core in insert-molding insulating part The problem of out of roundness decline of annular shape after bending.On the other hand, if the extending part for the iron core not covered by resin Near the involutory surface, it is likely that appearance is bent across the connecting line that segmentation iron core configures when bending iron core, with not by Iron core contact near the involutory surface of insulating part covering is to which there is a situation where short circuits.

Although have also contemplated sufficiently extend distance from connecting line to iron core so that flexure connecting line not with stator core The method of contact, but the problem that the axial length that thus also produces motor is elongated.

Summary of the invention

In view of the above problems, the motor that the purpose of an embodiment illustrated by the application is to provide a kind of high reliablity is used Stator.Especially linear stator core is being bent in the motor stator of production, is being prevented because of connecting line and stator iron Core contacts and short circuit occurs.

Also, the object of the present invention is to provide a kind of small-sized motor stators.Especially by linear stator iron Core bends and in the motor stator of production, shortens the distance from connecting line to stator core.

A kind of motor stator, which is characterized in that for having the inner-rotor type horse of the rotary shaft vertically extended Reach, and include band-like iron core, be at least one, the band-like iron core by by more than two segmentation iron cores by means of curved The iron core interconnecting piece of folding connects；And insulating part, it is by insert-molding and tight with the surface of the band-like iron core Patch, the segmentation iron core is with yoke portion circumferentially and the teeth portion extended from the yoke portion towards radially inner side, the yoke The circumferential end in portion is connect with the iron core interconnecting piece, coil is equipped with across the insulating part in the teeth portion, in the yoke The top in portion is drawn across the connecting line of more than two segmentation iron cores circumferentially from the coil, described exhausted Edge part has the tooth insulation division for the coil fitting surface for covering the teeth portion and upper surface and the iron core in the covering yoke portion The yoke insulation division of the upper surface of interconnecting piece.

Preferably, the radial center of the iron core interconnecting piece is located at the radial center than the yoke portion by radial outside Position, and there is involutory surface in the circumferential end faces of the radially inner side positioned at the iron core interconnecting piece in the yoke portion, in circumferential direction The interval ratio between opposed in the circumferential two involutory surface that upper two adjacent segmentation iron cores are respectively provided with The circumferential width of the iron core interconnecting piece is small, and the face of the radially inner side of the involutory surface and the iron core interconnecting piece is not by institute State insulating part covering.

Preferably, the insulating part has the wiring supporting part extended from the yoke insulation division towards axial top, The radial outside of the wiring supporting part has guiding groove circumferentially, and the connecting line configuration is in the guiding groove.

Preferably, at least one of described wiring supporting part has more than two guiding grooves, draws described The different connecting lines is configured in guide groove.

Preferably, there is the outer side slot axially extended in the outer peripheral surface of the iron core interconnecting piece.

Preferably, a circumferential end face for the band-like iron core is provided with circumferentially Connection protrusion outstanding, Another circumferential end face of the band-like iron core is provided with the coupling recess portion being circumferentially recessed, and the Connection protrusion is contained in together In the coupling recess portion of one or the different band-like iron cores.

Preferably, in the lower surface in the yoke portion, the lower surface of the iron core interconnecting piece and the Connection protrusion Either side in lower surface is provided with the exposed surface not covered by the insulating part.

Preferably, the outer peripheral surface in the yoke portion has the positioning groove portion vertically extended, the positioning groove portion Inner peripheral surface be the exposed surface not covered by the insulating part.

Preferably, the insulating part has winding guide portion, which is from the tooth insulation division towards axis The vertically position of plate outstanding, the inner peripheral surface of the winding guide portion are located at the inner peripheral surface than the teeth portion by radial The position in outside, the insulating part include the tooth covered between the inner peripheral surface of the teeth portion and the inner peripheral surface of the winding guide portion The tooth end insulation portion of the upper surface in portion.

Preferably, the position of the inner peripheral surface of guide portion in the inner part is wound described in the ratio in the lower surface of the teeth portion extremely Few a part is the exposed surface not covered by the insulating part.

Preferably, cast gate trace of the insulating part when the inner peripheral surface of the winding guide portion is formed with injection molding Mark.

Preferably, the insulating part covers the lower surface in the yoke portion and the lower surface of the iron core interconnecting piece.

Preferably, a kind of manufacturing method of motor stator, the motor stator are used to have and vertically extend Rotary shaft inner-rotor type, include band-like iron core, be at least one, the band-like iron core is by will be more than two Segmentation iron core is connected by means of the iron core interconnecting piece of bending；And insulating part, by insert-molding and with it is described The surface of band-like iron core is close to, and the segmentation iron core includes yoke portion, circumferentially；And teeth portion, from court, the yoke portion Extend to radially inner side, the circumferential end in the yoke portion is connect with the iron core interconnecting piece, and the insulating part has covering institute It states the tooth insulation division of the coil fitting surface of teeth portion and covers the upper surface in the yoke portion and the upper surface of the iron core interconnecting piece Yoke insulation division, the radial center of the iron core interconnecting piece is located at the position that radial outside is leaned on than the radial center in the yoke portion, And there is involutory surface in the circumferential end faces of the radially inner side positioned at the iron core interconnecting piece in the yoke portion, it is adjacent in the circumferential The interval of opposed in the circumferential two involutory surface that is respectively provided with of two segmentation iron cores connect than the iron core The circumferential width of socket part is small, and two mutually opposed involutory surfaces are configured to towards the open V-shape of radially inner side, described The inner peripheral surface composition of iron core interconnecting piece makes the most deep of the V-shape towards radial outside inner side slot outstanding, the pairing The inner peripheral surface of face and the iron core interconnecting piece does not form the insulating part and exposes,

In the manufacturing method of the motor stator,

Lower mold, the first convex molds and upper mold are used, the lower mold has the both ends with the band-like iron core The involutory surface be close to inner peripheral surface, first convex molds have with the band-like iron core in addition to those at both ends described in The flat shape portion that involutory surface is close to and is inserted into the inner side slot, and the axial height of first convex molds Higher than the band-like iron core, the upper mold is provided with hole on supply the upper end of first convex molds to be inserted into first, by institute It states band-like iron core and is inserted into together with the first convex molds and formed by the lower mold and the upper mold intracavitary, and carry out Injection molding.

Preferably, a kind of manufacturing method of motor stator, which is characterized in that used the second convex molds and described Upper mold, second convex molds have the side be close to the outer peripheral surface of the iron core interconnecting piece, and described second convex The axial height of shape mold is higher than the band-like iron core, and the upper mold is provided with the upper end insertion for second convex molds Second on hole, the second convex molds are inserted into and are formed by the lower mold and the upper mold intracavitary, and are infused It is moulded into type.

In the band-like iron core that more than two segmentation iron cores are formed by connecting by iron core interconnecting piece, by utilizing insulation Part covers the upper surface in the yoke portion of segmentation iron core and the upper surface of iron core interconnecting piece, can prevent connecting line from contacting with iron core. In particular, can prevent due to making iron core interconnecting piece shifting ground bend stator core, so that connecting line generates flexure, cause to bend Connecting line contacted with iron core.Also, by preventing connecting line from contacting with iron core, the sky between connecting line and iron core can be shortened Between distance, so as to shorten the length of the stator in the axial direction of motor.

An embodiment according to illustrated by the application is capable of providing a kind of motor stator of high reliablity.Especially Linear stator core is being bent in the motor stator of production, can prevent connecting line from contacting and producing with stator core Raw short circuit.

Also, the present invention is capable of providing a kind of small-sized motor stator.Especially by linear stator bending and In the motor stator of production, the distance from connecting line to stator core can be shortened.

The present invention can be more clearly understood that referring to attached drawing by the detailed description of the preferred embodiment for the present invention below Above-mentioned and other feature, element, step, features and advantages.

Detailed description of the invention

Fig. 1 is the cross-sectional view with the motor M of annular stator 102 involved in an embodiment illustrated by the application.

Fig. 2 is the outside drawing of the annular stator 102 of Fig. 1, indicates the appearance observed from axial top.

Fig. 3 is the cross-sectional view of annular stator 102, indicates section when using the A-A cutting line cutting of Fig. 2.

Fig. 4 is the outside drawing for the expansion stator 105 observed from axial top, before indicating that the annular stator 102 of Fig. 2 is bent State.

Fig. 5 is the figure for indicating to be formed the stator core 2 before insulating part 5, indicates the appearance observed from axial top.

Fig. 6 is by the figure of iron core interconnecting piece 21 and the amplification expression of its periphery in Fig. 5.

Fig. 7 is the figure for indicating to be formed the stator core 2 after insulating part, indicates the appearance observed from axial top.

Fig. 8 is the figure for indicating to be formed the stator core 2 after insulating part, indicates the appearance observed from axial lower section.

Fig. 9 is the figure for indicating expansion stator 105.

Figure 10 is the figure that a part amplification of stator 105 will be unfolded and indicate, indicates the appearance seen from radial outside.

Figure 11 is the enlarged drawing that a part amplification of stator 105 will be unfolded and indicate, indicates to see from the oblique upper of radial outside The appearance observed.

Figure 12 is the enlarged drawing that a part amplification of stator 105 will be unfolded and indicate, indicates to see from the obliquely downward of radial outside The appearance observed.

Figure 13 A is the figure for indicating the appearance of the upper connecting line 4U before bending.

Figure 13 B is the figure for indicating the appearance of the upper connecting line 4U after bending.

Figure 14 A is the figure for indicating the appearance of the lower connecting line 4D before bending.

Figure 14 B is the figure for indicating the appearance of the lower connecting line 4D after bending.

Figure 15 is the figure for indicating an example of the lower mold 300 used in molded insulator 5, is shown and upper mold The mold involutory surface of pairing.

Figure 16 is the figure for indicating the state being configured to stator core 2 in cavity of resorption 310.

Figure 17 is the enlarged drawing for indicating a part amplification of Figure 16.

Figure 18 is the figure for indicating an example of the upper mold 400 used in molded insulator 5, is shown and lower mold The mold involutory surface of 300 pairings.

Figure 19 indicates the section that mold 300 and upper mold 400 are formed under the B-B cutting line difference cutting with Figure 15.

Figure 20 indicates the section that mold 300 and upper mold 400 are formed under the C-C cutting line difference cutting with Figure 15.

Figure 21 is a configuration example for indicating annular stator 102 involved in other embodiments illustrated by the application Outside drawing indicates the appearance observed from axial top.

Specific embodiment

An embodiment illustrated by the application is illustrated referring to the drawings.In the present specification, for convenience The direction of the central axis J of motor is illustrated as up and down direction, but does not limit motor according to the present invention and exists Posture when use, also, the direction of the central axis J of motor is referred to as " axial direction ", by the diameter centered on central axis J To and circumferential be referred to as " radial direction " and " circumferential direction ".It is also the same about stator and stator core, they will be assembled into horse It is known as " axial direction ", " radial direction " and " circumferential direction " with the axial of motor, radial direction and circumferential consistent direction up in the state of interior.

Fig. 1 is the cross-sectional view with the motor M of annular stator 102 involved in an embodiment illustrated by the application, It illustrates the sections of motor M formed by the cutting plane cutting comprising central axis J.

Motor M is that be fixed on axis 100, annular stator 102 opposed with the radial outside of rotor 101 across gap for rotor 101 Inner-rotor type motor, with resin shell 110.The axial sides of rotor 101 are provided with the upper bearing (metal) of support shaft 100 103 and lower bearing 104.

Motor M is used as the driving source of the driving device of household appliances, office equipment, Medical Devices and automobile etc., It is constituted by being fixed on the stationary part of the framework of driving device and by stationary part bearing for the rotating part that can be rotated.Rotating part packet Include axis 100 and rotor 101.Stationary part includes annular stator 102, upper bearing (metal) 103 and lower bearing 104.

Axis 100 is the generally cylindrical component extended along axial direction (up and down direction), and by upper bearing (metal) 103 and lower axle 104 bearings are held, and are rotated centered on central axis J.Make towards protrusion below shell 110, the protruding portion lower end of axis 100 It is connected for output shaft and the driving portion of driving device.

Rotor 101 is the cylinder for being fixed on axis 100, and revolves together in the radially inner side of annular stator 102 and axis 100 Turn.

Annular stator 102 is the armature of motor M and configuration in the radial outside of rotor 101, and is fixed on shell 110. Annular stator 102 has substantially annulus shape, and so that the state that inner circumferential surface is exposed is embedded in the annulus of housing main body 111 In portion, the inner peripheral surface of exposing is opposed with the outer peripheral surface of rotor 101 across gap.

Shell 110 is made of housing main body 111 and casing cover 112.Housing main body 111 is to open with the axial top of direction The synthetic resin for having round-ended cylinder shape of the rotor insert port of mouth, and there is periphery and the axial direction of covering annular stator 102 The annular portion of two sides and the base plate for keeping lower bearing 104.Housing main body 111 is the insert-molding by annular stator 102 The integrally formed synthetic resin with annular stator 102.Motor with such housing main body 111, which is referred to as, moulds horse It reaches.Casing cover 112 is the cover for being installed on the rotor insert port of housing main body 111, and keeps upper bearing (metal) 103.

Fig. 2 and Fig. 3 is a composition for indicating annular stator 102 involved in an embodiment illustrated by the application The figure of example.Fig. 2 is the outside drawing of the annular stator 102 of Fig. 1, indicates the appearance observed from axial top.Fig. 3 is cyclic annular fixed The cross-sectional view of son 102 indicates the section formed with the A-A cutting line cutting in Fig. 2.

Annular stator 102 has stator core 2, coil 3, connecting line 4 and insulating part 5.

Stator core 2 is by being processed into uniform shapes for magnetic steel plates such as silicon steel plates and along stacking that is axially stacked and being formed Steel plate is constituted.Each magnetic steel plate has cricoid core-back 2b and protrudes from the inner peripheral surface of core-back 2b towards radially inner side Multiple teeth portion 2t.Core-back 2b is constituted and connecting multiple yoke portion 2y, and is had using yoke portion 2y as one The substantially a ring-shaped shape on side.Also, teeth portion 2t is accordingly formed with yoke portion 2y and is connect with the circumferential center of yoke portion 2y.In addition, In an embodiment illustrated by the application, core-back 2b linearly to the side of the radial outside of yoke portion 2y is in just more The example of the case where side shape is illustrated, but also the side of the radial outside of yoke portion 2y can be arranged to arc-shaped, by iron Core back 2b is set as annulus shape.

Coil 3 is the spiral that the teeth portion 2t of stator core 2 is wound in across insulating part 5.If providing driving electricity to coil 3 Stream then generates radial magnetic flux in the teeth portion 2t as magnetic core.Therefore, circumferential turn is generated between teeth portion 2t and rotor 101 Square, axis 100 are rotated centered on central axis J.

Connecting line 4 is to be connected with each other different two coils 3 or in order to provide driving current to coil 3 by coil 3 wirings being connect with driving circuit (not shown).Connecting line 4 is drawn from coil 3, and along yoke portion, 2y extends in the circumferential, and with cross Mode across two adjacent yoke portion 2y configures.Annular stator 102 is in yoke involved in an embodiment illustrated by the application The axial sides of portion 2y are configured with connecting line 4.Upper connecting line 4U is connecting line 4 of the configuration above the axial direction of yoke portion 2y, lower company Wiring 4D is connecting line 4 of the configuration below the axial direction of yoke portion 2y.

Insulating part 5 is the insulating element for making coil 3 and connecting line 4 and stator core 2 insulate, and passes through stator core 2 Insert-molding and it is integrally formed with stator core 2, for the synthetic resin be close to the surface of stator core 2.Insulating part 5 has There are yoke insulation division 51, wiring supporting part 52, tooth insulation division 53, winding guide portion 54 and tooth end insulation portion 56.

Yoke insulation division 51 is the insulating part for preventing connecting line 4 from contacting with the yoke portion 2y of stator core 2, is formed in The axial upper surface and lower surface of yoke portion 2y.Yoke upper surface insulation division 51U is the yoke insulation for being formed in the upper surface of yoke portion 2y Portion 51.The upper surface of yoke portion 2y is covered by yoke upper surface insulation division 51U, so that connecting line 4U be prevented to contact with yoke portion 2y. Yoke lower surface insulation division 51D is the yoke insulation division 51 for being formed in the lower surface of yoke portion 2y.In yoke portion, the lower surface of 2y exists and does not have The region of yoke lower surface insulation division 51D is formed, stator core 2 is to expose in the area.

Wiring supporting part 52 is the bearing part of support connection line 4, has the shape axially protruded from yoke insulation division 51. Upper wiring supporting part 52U is from yoke upper surface insulation division 51U towards axial top wiring supporting part 52 outstanding, in upper wiring branch There are two guiding groove 52a, 52b for the radial outside formation of bearing portion 52U, and upper connecting line 4U is configured in the guiding groove 52a, 52b. Two guiding grooves 52a, 52b are circumferentially and to be formed as the mutually different groove portion of axial position, by each guiding groove Different connecting lines 4 is accommodated in 52a, 52b, two connecting lines 4 are kept with being not in contact with each other.Lower wiring supporting part 52D is from yoke The axial lower section wiring supporting part 52 outstanding of lower surface insulation division 51D direction, and in the radial outside of lower wiring supporting part 52D Two guiding grooves 52a, 52b circumferentially are also formed with, lower connecting line 4D is configured in the guiding groove 52a, 52b.

Tooth insulation division 53 is the insulating part for preventing coil 3 from contacting with the teeth portion 2t of stator core 2, and is formed For the cylindrical body of the coil fitting surface 2w of covering teeth portion 2t.The surface region for the assembly coil 3 that coil fitting surface 2w is teeth portion 2t, It is made of the both ends of the surface of the upper surface of teeth portion 2t, lower surface and circumferential direction.Also, tooth insulation division 53 is connect with yoke insulation division 51.

Winding guide portion 54 be limited alignment circle fitting surface 2w radially inner edge insulating properties coil supports component, have from Tooth insulation division 53 is towards up and down direction shape outstanding, such as with flange shape.Coil fitting surface 2w is wired supporting part 52 limit with region folded by winding guide portion 54, the inner peripheral surface of the wired supporting part 52 of radially outer edge, radially inner edge quilt The outer peripheral surface for winding guide portion 54 limits.Winding guide portion 54 is formed in the position that the inner peripheral surface than teeth portion 2t leans on radial outside, The inner peripheral surface of the ratio winding guide portion 54 of teeth portion 2t is known as tooth terminal part 2ts by the position of radially inner side.

Tooth end insulation portion 56 is the insulating part for being formed in tooth terminal part 2ts.That is, tooth end insulation portion 56 To make tooth insulation division 53 towards than winding guide portion 54 protruding portion made of the protrusion of the position of radially inner side.Tooth end insulation portion The upper surface of 56 covering tooth terminal part 2ts.On the other hand, in the lower surface of tooth terminal part 2ts, there are not formed tooth end insulations The region in portion 56, stator core 2 are to expose in the area.By being drawn in the mode adjacent with winding guide portion 54 in winding Lead portion 54 radially inner side formed tooth end insulation portion 56, can prevent winding guide portion 54 due to coil 3 pressure and direction Radially inner side inclination with rotor 101 to contact.Also, even if gate vestiges when resin forming are formed in winding guide portion 54 Inner peripheral surface will not be contacted with rotor 101.Also, in the case where motor M is moulding motor, due in winding guide portion 54 Inner peripheral surface on be also capable of forming the resin of shell 110, therefore being capable of stronger ground support ring shape stator 102 (referring to Fig.1).

Fig. 4 is the outside drawing for the expansion stator 105 observed from axial top, and the annular stator 102 for showing Fig. 2 is bent Preceding state.Be unfolded stator 105 by after linear stator core 2 forms insulating part 5, further install coil 3 and Connecting line 4 and make, and with both ends open elongated shape.Annular stator 102 is by by such expansion stator 105 be bent into it is substantially circular after both ends are connected and are obtained.

Stator 105 is unfolded compared with annular stator 102, the interval between teeth portion 2t is wider, therefore the assembling work of coil 3 becomes It must be easy.So stator 105 is unfolded in production first, is then bent, be thus fabricated to annular stator 102.In this embodiment party In formula, it is illustrated to the case where stator 105 has substantially rectilinear form is unfolded, but annular stator according to the present invention Shape before 102 bending is not limited to rectilinear form.

Fig. 5 to Fig. 8 is the figure for indicating the production process of expansion stator 105 sequentially in time, and Fig. 5 and Fig. 6 indicate shape At the stator core 2 before insulating part 5.Fig. 7 forms the state after insulating part 5, Fig. 8 table relative to the expression of stator core 2 of Fig. 5 Show the state after further defining coil 3 and connecting line 4.

Fig. 5 is the figure for indicating to be formed the stator core 2 before insulating part 5, appearance when indicating from axial top.Stator Iron core 2 is the band-like iron core of the elongated shape with both ends open, and stator core 2 is the iron core interconnecting piece 21 by that can bend More than two segmentation iron cores 20 are continuously connected and are constituted.Such as eight segmentation iron cores 20 pass through seven iron core interconnecting pieces 21 and connect.In addition, being with the straight of substantially rectilinear form to stator core 2 in an embodiment illustrated by the application The case where iron core, is illustrated, but before can be used for the bending of stator core 2 of annular stator 102 according to the present invention Shape be not limited to rectilinear form.Also, the band-like iron core in this specification is referred to more than two segmentation iron cores 20 The stator core 2 being continuously connected, it is unrelated with the front and back of bending.Therefore, annular stator 102 and expansion stator 105 wrap Containing band-like iron core.

Segmentation iron core 20 is extended by yoke portion 2y circumferentially and the circumferential center from yoke portion 2y towards radially inner side Teeth portion 2t is constituted.A part of the circumferential end faces of the yoke portion 2y of two adjacent segmentation iron cores 20 passes through 21 phase of iron core interconnecting piece It connects.More particularly, the near the perimeter of region in the circumferential end faces of yoke portion 2y is connect with iron core interconnecting piece 21, and The region that radially inner side is leaned on than iron core interconnecting piece 21 is involutory surface 200.

Compared with yoke portion 2y, the radial width of iron core interconnecting piece 21 is sufficiently narrow, can easily make its deformation.Therefore, lead to Application external force is crossed, not making 2y deformation in yoke portion that the deformation of iron core interconnecting piece 21 can be made to bend stator core 2.Iron core interconnecting piece 21 radial center is located at the position that radial outside is leaned on than the radial center of yoke portion 2y.

Involutory surface 200 is the circumferential end faces of yoke portion 2y, and opposed in the circumferential between adjacent segmentation iron core 20.It is curved The adjacent involutory surface 200 of stator core 2 before folding is configured to V-shape, and as folded by these involutory surfaces 200 made of V Word space 201 is formed between segmentation iron core 20.The V word space 201 be towards the space of the open V-shape of radially inner side, By bending stator core 2, which is fulcrum closing with iron core interconnecting piece 21.At this point, iron core interconnecting piece 21 is bent, Adjacent involutory surface 200 is adjacent to each other, and interval is narrower than the circumferential width of iron core interconnecting piece 21.

Positioning groove portion 202 is to be formed in the groove portion of the positioning of outer peripheral surface of yoke portion 2y.In yoke portion, the outer peripheral edge of 2y is for example In circumferential center configured with the location indentations with rectangular section.Therefore, it is formed with and axially extends in the outer peripheral surface of yoke portion 2y Positioning groove portion 202.Positioning groove portion 202 is when forming insulating part 5 by insert-molding for stator core 2 in mold Positioning.

Interconnecting piece 203 is the both ends of the periphery of yoke portion 2y, adjacent with iron core interconnecting piece 21.If the periphery of yoke portion 2y is in straight Threadiness, then it is the polygon on vertex that the periphery of cricoid stator core 2, which is with iron core interconnecting piece 21,.Therefore, by making stator iron The periphery of core 2 tilts at interconnecting piece 203, makes central axis J of the vertex of regular polygon close to motor M, can be small by motor M Type.In addition, in the case where the periphery of yoke portion 2y is circular arc, for example, can make interconnecting piece 203 become with it is radial orthogonal straight Line, or interconnecting piece 203 can be omitted.

Coupling recess portion 22 and Connection protrusion 23 are a pair of of the connecting elements for connecting the both ends of band-like stator core 2. Coupling recess portion 22 is recess portion made of making one end of stator core 2 circumferentially be recessed, and Connection protrusion 23 is to make the another of stator core 2 Protrusion made of one end circumferentially protrudes.Coupling recess portion 22 and Connection protrusion 23 are arranged in the circumferential end faces of yoke portion 2y Mutual corresponding position, and there is the shape axially extended.These circumferential end faces are facing each other in annular stator 102 Involutory surface 200.That is, Connection protrusion 23 is accommodated in coupling recess portion 22 if these involutory surfaces 200 are facing each other In, expansion stator 105 becomes annular stator 102.

Fig. 6 is the figure for indicating the iron core interconnecting piece 21 of Fig. 5 and the amplification of its periphery.It is inside in the diameter of iron core interconnecting piece 21 Side is formed with inner side slot 204, is formed with outer side slot 205 in the radial outside of iron core interconnecting piece 21.

Inner side slot 204 be in order to mitigate the bending due to stator core 2 caused by stress concentrate and be formed in iron core company The groove portion of the inner peripheral surface of socket part 21.By the way that inner side slot 204 is arranged, foring in the radially inner side of iron core interconnecting piece 21 keeps V word empty Between 201 most deep towards radial outside it is prominent made of space.Therefore the inner peripheral surface of iron core interconnecting piece 21 expands, fixed in bending When sub- iron core 2, the stress that can be mitigated on the inner peripheral surface of iron core interconnecting piece 21 is concentrated.Inner side slot 204 is for example preferably formed into and V The space for the general cylindrical shape that word space 201 is connected to.

Outer side slot 205 be with iron core interconnecting piece 21 be correspondingly formed on band-like stator core 2 outer peripheral surface along axial direction The groove portion of extension.By the outer peripheral surface in iron core interconnecting piece 21, outer side slot 205 is set, it can be accurate when bending stator core 2 Ground is bent at iron core interconnecting piece 21, so as to improve the precision of crooked place.Determine further, it is possible to mitigate due to bending Sub- iron core 2 and generate stress concentrate.

Fig. 7 is the figure for indicating to be formed the stator core 2 after insulating part 5, indicates the appearance observed from axial top.Absolutely Edge part 5 and inject the insert-molding of resin after being inserted into band-like stator core 2 into mold with the integrated landform of stator core 2 At.Also, insulating part 5 is formed in the upper surface, lower surface and coil fitting surface 2w of yoke portion 2y, but is not formed in yoke portion 2y Outer peripheral surface and involutory surface 200 and teeth portion 2t inner peripheral surface.

In yoke portion, the upper surface of 2y is formed with the insulating part 5 with flat shape identical with the upper surface, yoke portion 2y's Entire upper surface is covered by insulating part 5.And it is also formed in the upper surface of iron core interconnecting piece 21 with identical as the upper surface Flat shape insulating part 5, and the entire upper surface of iron core interconnecting piece 21 is covered by insulating part 5.That is, yoke portion 2y And the entire upper surface of iron core interconnecting piece 21 is covered by insulating part 5.Therefore, it can prevent connecting line 4 due to flexure and stator Iron core 2 contacts.As a result, the distance from stator core 2 to connecting line 4 can be shortened, so as to reduce the axial direction of motor M Size.Also, since insulating part 5 has not from yoke portion 2y and the flat shape outstanding of iron core interconnecting piece 21, it can prevent It is only generated when stator 105 is unfolded in bending bad.In addition shape when flat shape is referred to from end on observation.

The end face of the insulating part 5 adjacent with involutory surface 200 and involutory surface 200 are consistent.That is, in the upper table of yoke portion 2y The involutory surface adjacent area 550 adjacent with involutory surface 200 in face is also formed with insulating part 5, and the insulating part 5 is not from right Conjunction face 200 is prominent towards outer circumferential.By covering involutory surface adjacent area 550 using insulating part 5, can prevent across pairing The connecting line 4 of the top in face 200 is contacted with stator core 2.Also, due to not forming insulating part 5 in involutory surface 200, and It protrudes insulating part 5 by the position of outer circumferential towards than involutory surface 200, therefore insulating part 5 can be prevented in bending exhibition Become obstacle when opening stator 105, and can prevent the out of roundness of annular stator 102 from declining.

The end face of the insulating part 5 adjacent with positioning groove portion 202 and positioning groove portion 202 are consistent.That is, yoke portion 2y's The positioning groove portion adjacent area 551 adjacent with positioning groove portion 202 in upper surface is formed with insulating part 5, and the insulating part 5 does not have It is prominent in oriented positioning groove portion 202.By that can prevent in locating slot using the covering positioning groove portion adjacent area 551 of insulating part 5 Connecting line 4 is contacted with stator core 2 at portion's adjacent area 551.

The end face and coupling recess portion 22 of the insulating part 5 adjacent with coupling recess portion 22 are consistent.That is, in the upper of yoke portion 2y The coupling recess portion adjacent area 552 adjacent with coupling recess portion 22 in surface is formed with insulating part 5, and the insulating part 5 does not have It is protruded outward from coupling recess portion 22.Also, the end face of the insulating part 5 adjacent with Connection protrusion 23 also with Connection protrusion 23 1 It causes.That is, the Connection protrusion adjacent area 553 adjacent with Connection protrusion 23 in the upper surface of yoke portion 2y is formed with absolutely Edge part 5, and the insulating part 5 is not protruded outward from Connection protrusion 23.By covering coupling recess portion 22 using insulating part 5 And Connection protrusion 23, the connecting line 4 at coupling recess portion adjacent area 552 and Connection protrusion adjacent area 553 can be prevented It is contacted with stator core 2.Also, due to not making insulating part 5 lean on week outward towards than coupling recess portion 22 and Connection protrusion 23 The position of side is prominent, therefore can prevent insulating part 5 from becoming obstacle at the both ends of connection expansion stator 105.

Fig. 8 is the figure for indicating to be formed the stator core 2 after insulating part 5, is indicated from the appearance that axially lower section is observed, figure The region of shade is marked to indicate the region that stator core 2 exposes.Insulating part 5 is not formed in the pairing in the lower surface of yoke portion 2y Face adjacent area 550, positioning groove portion adjacent area 551, coupling recess portion adjacent area 552 and Connection protrusion adjacent area 553. Also, insulating part 5 is not formed in the lower surface of the tooth terminal part 2ts in the lower surface of teeth portion 2t.

Fig. 9 to Figure 12 is stator core 2 after indicating to be formed coil 3 and connecting line 4, stator 105 is namely unfolded Figure.Fig. 9 indicates the appearance observed from axial top.And Figure 10 to Figure 12 is a part amplification table that stator 105 will be unfolded The enlarged drawing shown, Figure 10 indicate the appearance observed from radial outside, and Figure 11 expression is observed from the oblique upper of radial outside Appearance, Figure 12 indicate the appearance observed from the obliquely downward of radial outside.

Figure 13 A and Figure 13 B are the figure for indicating the appearance of upper connecting line 4U of bending front and back, are indicated from axial top The appearance arrived.Figure 13 A indicates that the expansion stator 105 before bending, Figure 13 B indicate the annular stator 102 after bending.

Connecting line 4 is configured in a manner of passing through involutory surface 200.That is, in the expansion stator 105 of Figure 13 A, upper company Wiring 4U is passed through on the V word space 201 formed by two involutory surfaces 200 and across adjacent segmentation iron core 20.On the other hand, exist In the annular stator 102 of Figure 13 B, connecting line 4 passes through from two substantially uniform involutory surfaces 200 and across adjacent segmentation iron Core 20.

If bending expansion stator 105, two involutory surfaces 200 are close to each other in a manner of closing V word space 201 and become Substantially uniform state.Therefore, upper connecting line 4U generates flexure.However, since the entire upper surface of yoke portion 2y is covered by insulating part 5 Lid, therefore will not be contacted with stator core 2 upper connecting line 4U flexure.In particular, by iron core interconnecting piece 21, pairing Face adjacent area 550, positioning groove portion adjacent area 551, coupling recess portion adjacent area 552 and Connection protrusion adjacent area 553 Insulating part 5 is formed, can prevent connecting line 4U from contacting with stator core 2.

Figure 14 A and Figure 14 B are the figures for indicating the appearance of lower connecting line 4D of bending front and back, are indicated from axial lower section The appearance arrived.Figure 14 A indicates that the expansion stator 105 before bending, Figure 14 B indicate the annular stator 102 after bending.In addition, Figure 14 A And Figure 14 B, other than the shape of insulating part 5, remaining is identical as Figure 13 A and Figure 13 B.

The lower surface of iron core interconnecting piece 21 is not covered by insulating part 5, and a part in the lower surface of yoke portion 2y does not have yet It is covered by insulating part 5.Therefore, in order to enable even if in the feelings for leading to lower connecting line 4D flexure due to bending expansion stator 105 Connecting line is not also contacted with the stator core of exposing 2 under condition, needs to extend from stator core 2 to distance between lower connecting line 4D.

Figure 15 to Figure 20 is the figure for illustrating the formation process of insulating part 5.Figure 15 to Figure 17 indicates lower mold 300, figure 18 indicate upper mold.Also, Figure 19 and Figure 20 respectively indicate in Figure 15 B-B cutting line and C-C cutting line cutting under The section that mold 300 and upper mold 400 are formed.

Insulating part 5 is the resin formed and to the intracavitary injection resin formed by lower mold 300 and upper mold 400 Molded product.Due to being formed by insert-molding, the shape of insulating part 5 is determined by the mold of resin forming, not vulnerable to To the influence generated by the deviation of the axial height of stator core 2.In particular, the shape due to tooth insulation division 53 can be prevented Deviation causes the resistance value of coil 3 to generate deviation between tooth socket to become the reason of generating vibration.

Figure 15 is the figure for indicating an example of the lower mold 300 for molded insulator 5, is shown with upper mold (not Diagram) pairing mold involutory surface.Cavity of resorption 310 and flow path groove 320 are formed in lower mold 300.

Cavity of resorption 310 be for molded insulator 5 axial lower portion space, and with the epicoele of upper mold 400 410 The chamber of resin forming is constituted together.The first convex molds 311 and the second convex molds 312 are configured in cavity of resorption 310.

There is first convex molds 311 contact surface 311a, contact surface 311a to contact with involutory surface 200 to avoid in pairing Face 200 forms resin, and the involutory surface 200 forms V word space 201 between adjacent segmentation iron core 20.Second convex molds 312 there is contact surface 312a, contact surface 312a, which to contact with outer side slot 205, forms resin to avoid in outer side channel 205, described outer Side channel 205 and iron core interconnecting piece 21 are accordingly formed on the outer peripheral surface of yoke portion 2y.

The axial height of first convex molds 311 and the second convex molds 312 than stator core 2 is high, and with It is configured from the mold involutory surface mode outstanding of lower mold 300.That is, the first convex molds 311 and the second convex mould The upper surface of tool 312 is respectively positioned on the position than leaning on 400 side of upper mold with the mold involutory surface of upper mold 400.In addition, the first convex Mold 311 and the second convex molds 312 may be either seperated component of the configuration in cavity of resorption 310, can also be and lower mold 300 The a part for the lower mold 300 being integrally formed.

Flow path groove 320 is the groove portion that runner is formed together for the flow path groove 420 with upper mold 400.Runner is for inciting somebody to action The resin of flow regime is sent to the path of the cast gate 421 to intracavitary casting resin.

Figure 16 is the figure for indicating to be configured with the state of stator core 2 in cavity of resorption 310.And Figure 17 is by one of Figure 16 The enlarged drawing for dividing amplification to indicate.Insulating part 5 is formed by the insert-molding of stator core 2.That is, by by stator iron Core 2 is configured to intracavitary backward intracavitary remaining space injection resin and is formed.

Contact surface 311a is a part of the side of the first convex molds 311, and with the stator that is inserted into cavity of resorption 310 The involutory surface 200 in addition to those at both ends of iron core 2 contacts.Therefore, resin is not formed in these involutory surfaces 200, so can make The circumferential end faces and involutory surface 200 of the insulating part 5 adjacent with V word space 201 are consistent.

Insertion section 311b is the protruding portion for being formed in the end of the first convex molds 311, and is inserted into inner side slot 204 In.First convex molds 311 have the sharp planar shaped constituted and two contact surface 311a are configured to V-shape Shape, and it is provided with insertion section 311b at its end.By the way that insertion section 311b to be inserted into inner side slot 204, in inner side slot 204 Resin is not also formed inside.In addition, if it is the degree that not can enter resin, it can also be in inner side slot 204 and insertion section 311b Between there are gaps.

Contact surface 312a is a part of the side of the second convex molds 312 and contacts with interconnecting piece 203.Therefore, exist The interconnecting piece 203 for being formed in the circumferential end of the outer peripheral surface of yoke portion 2y does not also form resin, can make to be formed in yoke portion 2y's The end face of the radial outside of the insulating part 5 of upper surface is consistent with the outer peripheral surface of yoke portion 2y.

Insertion section 312b is to be formed in the protruding portion of the end of the second convex molds 312 and be inserted into outer side slot 205. Second convex molds 312 have the flat shape that two contact surface 312a are configured to V-shape and are constituted, and at its end It is provided with insertion section 312b.By the way that insertion section 312b to be inserted into outer side slot 205, resin is not also formed in outer side channel 205. It, can also there are gaps between outer side channel 205 and insertion section 312b in addition, if it is the degree that not can enter resin.If If the interconnecting piece 203 or outer side slot 205 for being set to the radial outside of stator core 2 form resin, then in order to bend exhibition It opens stator 105 and needs bigger power, thus do not allow pliable.Therefore, by not formed in interconnecting piece 203 and outer side slot 205 The manufacture of resin, annular stator 102 becomes easy.

Contact surface 314 be cavity of resorption 310 side wall a part and with the stator core 2 being inserted into cavity of resorption 310 two The involutory surface 200 at end contacts.Therefore, resin is not also formed in these involutory surfaces 200, therefore the week of stator core 2 can be made It is consistent to the end face of the insulating part 5 at both ends and involutory surface 200.

Positioning convex portion 315 is the protruding portion for being contained in positioning groove portion 202.It is connect in the outer peripheral surface of cavity of resorption 310 and yoke portion 2y The contact surface of touching is formed with towards positioning convex portion 315 outstanding in cavity of resorption 310.By the way that positioning convex portion 315 is contained in locating slot In portion 202, accurately stator core 2 can be positioned in cavity of resorption 310.

The stator core 2 being inserted into cavity of resorption 310 and abutting a part of lower surface with the bottom of cavity of resorption 310 by Lower mold 300 supports.Iron core interconnecting piece 21, involutory surface phase in the lower surface of stator core 2 involved in present embodiment Neighbouring region 550 and positioning groove portion adjacent area 551 and tooth terminal part 2ts do not form insulating part 5.Therefore, these regions It is contacted with the bottom surface of cavity of resorption 310, to support stator core 2 in resin forming.In addition, in the lower surface of stator core 2 Insulating part 5 is not formed and exposed area is arbitrary.As long as such as making lower surface or the yoke portion 2y of iron core interconnecting piece 21 Expose at least part region in lower surface, it will be able to stator core 2 is supported in resin forming.

Figure 18 is the figure for indicating an example of the upper mold 400 used in molded insulator 5, is shown and lower mold The mold involutory surface of 300 pairings.Hole 412, flow path groove on hole 411, second are formed on epicoele 410, first in upper mold 400 420 and cast gate 421.

Epicoele 410 is the space of the axial upper portion for molded insulator 5, and constitutes tree together with cavity of resorption 310 The chamber of rouge molding.

Hole 411 is the through hole or recess portion for accommodating the top of the first convex molds 311 on first.First convex molds 311 top is formed in such a way that the mold involutory surface from lower mold 300 is outstanding, and hole 411 is formed in and first on first The corresponding position of convex molds 311.Therefore, if lower mold 300 and 400 pairing of upper mold, the top of the first convex molds 311 It is contained on first in hole 411.

Hole 412 is the through hole or recess portion for accommodating the top of the second convex molds 312 on second.Second convex molds 312 top is formed in such a way that the mold involutory surface from lower mold 300 is outstanding, and hole 412 is formed in and the second convex on second On the corresponding position of mold 312.Therefore, if lower mold 300 and 400 pairing of upper mold, the top of the second convex molds 312 holds It is contained on second in hole 412.

Cast gate 421 is inlet for the resin of the flow regime entered from runner to be injected into chamber, and have than The small sectional area of runner.Cast gate 421 is set to the position for becoming the inner peripheral surface of winding guide portion 54.

The structure and manufacturing method of annular stator 102 involved in an embodiment illustrated by the application institute as above It states.Hereinafter, to using the above structure and manufacturing method generate function and effect be described in detail.

There is annular stator 102 involved in an embodiment illustrated by the application the iron core by that can bend to connect The stator core 2 and pass through insert-molding and 2 one of stator core that more than two segmentation iron cores 20 are formed by connecting by portion 21 The insulating part 5 that ground is formed.Segmentation iron core 20 has a yoke portion 2y circumferentially and extends from yoke portion 2y towards radially inner side The circumferential end of teeth portion 2t, yoke portion 2y are connect with iron core interconnecting piece 21.Also, insulating part 5 includes the coil dress of covering teeth portion 2t The yoke insulation division 51 of the upper surface of the upper surface and iron core interconnecting piece 21 of tooth insulation division 53 and covering yoke portion 2y with face 2w.

By adopting such structure, in the upper surface of yoke portion 2y and the upper surface of iron core interconnecting piece 21, stator core 2 Do not expose, therefore can prevent connecting line 4 from contacting with stator core 2.Can especially prevent at iron core interconnecting piece 20 by Lead to the flexure of connecting line 4 in bending stator core 2 and the connecting line 4 bent is contacted with stator core 2.

Also, by preventing the connecting line 4 of flexure from contacting with stator core 2, connecting line 4 and stator core 2 can be shortened Between space length.Therefore, the axial height of motor M can be reduced.

Annular stator 102 involved in an embodiment illustrated by the application is at two adjacent with iron core interconnecting piece 21 The circumferential end faces of yoke portion 2y be formed through bending iron core interconnecting piece 21 and involutory surface 200 close to each other, iron core interconnecting piece 21 The position for leaning on radial outside than involutory surface 200 is set, and is not had in the inner peripheral surface of involutory surface 200 and iron core interconnecting piece 21 Form insulating part 5.

Due to not formed in the inner peripheral surface of two involutory surfaces 200 and iron core interconnecting piece 21 adjacent with iron core interconnecting piece 21 Insulating part 5, therefore can prevent from accompanying insulating part 5 between adjacent segmentation iron core 20 to not allow flexible expansion stator 105.Therefore, the shape for being able to suppress annular stator 102 generates deformation, its out of roundness is inhibited to decline.

In motor stator involved in an embodiment illustrated by the application, two adjacent with iron core interconnecting piece 21 Involutory surface 200 is formed towards the open V word space 201 of radially inner side, and the inner peripheral surface formation of iron core interconnecting piece 21 makes V word space 201 most deep is towards radial outside inner side slot 204 outstanding.

By adopting such structure, being capable of increasing the area of the inner peripheral surface of iron core interconnecting piece 21, can alleviate due to curved The stress rolling over stator core 2 and generating in iron core interconnecting piece 21 is concentrated.Therefore, stator core 2 can easily be bent.Inner side slot 204 be preferably general cylindrical shape.

Insulating part 5 has the wiring supporting part 52 extended from yoke insulation division 51 towards axial top, in wiring supporting part 52 Radial outside be formed with guiding groove 52a, 52b circumferentially, connecting line 4 configures in guiding groove 52a, 52b.By adopting It can prevent connecting line 4 from being pullled towards 3 side of coil with such structure.

More than two guiding groove 52a, 52b particularly preferably are formed in wiring supporting part 52, and in these guiding grooves Different connecting lines 4 is configured in 52a, 52b.By adopting such structure, can not mutually be connect in the axial side of yoke portion 2y Contact to earth the connecting line 4 of configuration two or more.Such as the connecting line 4 of multiple phases can not configured in the same yoke with not contacting with each other On portion 2y.

The outer side slot 205 of motor stator involved in present embodiment is formed in the outer peripheral surface of iron core interconnecting piece 21.Cause This can accurately bend at iron core interconnecting piece 21, when bending stator core 2 so as to improve the essence of crooked place Degree.It is concentrated further, it is possible to mitigate the stress generated because bending stator core 2.

Motor involved in an embodiment illustrated by the application is provided with stator in one end of band-like stator core 2 Circumferentially Connection protrusion 23 outstanding is provided with the coupling recess portion for accommodating Connection protrusion 23 in the other end of band-like stator core 2 22。

By adopting such structure, the two of simultaneously connecting stator iron core 2 can be accurately located in mode facing each other The involutory surface 200 at end.Further, it is possible to which one end of the stator core 2 after bending is inhibited to extend towards radial outside.Therefore it can mention The out of roundness of high annular stator 102.

Also, the stator core 2 by utilizing insulating part 5 to cover the upper surface of Connection protrusion 23, in Connection protrusion 23 Do not expose, therefore the connecting line 4 that can prevent the end edge across stator core 2 from configuring is contacted with stator core 2.

The positioning groove portion 202 of annular stator involved in an embodiment illustrated by the application vertically extended It is formed in the outer peripheral surface of yoke portion 2y.

By adopting such structure, when stator core 2 to be inserted into the mold for being used for insert-molding insulating part 5, Stator core 2 can be accurately located.Further, it is possible to prevent the injection pressure when injecting resin into mold due to resin And position of the stator core 2 in mold is caused to generate deviation.For example, if the inner wall in the chamber of mold forms positioning convex portion 315, And the positioning convex portion 315 is contained in positioning groove portion 202, stator core 2 can be accurately located in mold, from Without being easy to produce position deviation.Therefore it can prevent stator core 2 from generating offset relative to insulating part 5.

Annular stator involved in an embodiment illustrated by the application has to be protruded upward from tooth insulation division 53 And the winding guide portion 54 of the radially inner edge of coil fitting surface 2w is limited, the inner peripheral surface of winding guide portion 54 is configured more exhausted than tooth The inner peripheral surface of edge 53 leans on the position of radial outside.

By protruding yoke insulation division 51 by the position of radially inner side towards than winding guide portion 54, it can be improved winding and draw Lead the intensity of the anti-pressure towards radially inner side in portion 54.Therefore, it is able to suppress since the pressure of coil 3 causes to wind guide portion 54 It tilts towards radially inner side and is contacted with rotor 101.

And due to increasing the inner peripheral surface from winding guide portion 54 the distance between to rotor 101, even if rolling up Around guide portion 54 towards in the inclined situation of radially inner side, winding guide portion 54 is also not easy to contact with rotor 101.Also, energy Enough gate vestiges when the inner peripheral surface for winding guide portion 54 forms resin forming.

Also, in the case where motor M is moulding motor, shell can be also formed on the inner peripheral surface of winding guide portion 54 110 resin, therefore being capable of stronger ground support ring shape stator 102.

Annular stator involved in an embodiment illustrated by the application is formed in the inner peripheral surface of winding guide portion 54 Gate vestiges when injection molding.

The shape generally relatively narrow with radial width of guide portion 54 is wound, such as with flange shape.Therefore, exhausted in molding It is not easy potting resin when edge part 5, is easy to cause lack of fill.Since the intracavitary resin inflow velocity of mold is molded to chamber The cast gate of resin can utilize nearby than very fast, therefore by the way that cast gate is arranged in the inner peripheral surface of winding guide portion 54 than faster Inflow velocity prevents the resin lack of fill at winding guide portion 54.

The lower surface of the yoke portion 2y of motor stator involved in an embodiment illustrated by the application, iron core interconnecting piece At least part in 21 lower surface and the lower surface of tooth terminal part is not covered by insulating part 5.

Do not have by least part region in the lower surface of yoke portion 2y or iron core interconnecting piece 21 or tooth terminal part Insulating part 5 is formed, the region and the bottom surface of cavity of resorption 310 can be made to contact in resin forming, to support stator core 2.Example Such as, since the area near iron core interconnecting piece 21 is bigger, it is easy bearing stator core 2, it is therefore preferable that by iron core interconnecting piece 21 Nearby as the region for supporting stator core 2.

The manufacturing method of annular stator involved in an embodiment illustrated by the application uses lower mold 300, first Convex molds 311 and upper mold 400, the lower mold 300 have the inner circumferential being close to the involutory surface at the both ends of stator core 2 Face, first convex molds 311 are interior with being close to the involutory surface 200 in addition to those at both ends of stator core 2 and being inserted into The axial height of flat shape in side channel 204, first convex molds 311 is higher than stator core 2, and the upper mold 400 is set Be equipped with for the upper end of the first convex molds 311 be inserted into first on hole 411, together by stator core 2 and the first convex molds 311 It is inserted into and is formed by lower mold 300 and upper mold 400 intracavitary, and carry out injection molding.

Since the axial height of the first convex molds 311 is bigger than stator core 2, the upper end of the first convex molds 311 It is prominent from lower mold 300.On the other hand, it is formed with and hole 411 on the first convex molds 311 corresponding first in upper mold 400. Therefore, if if the mold involutory surface pairing of lower mold 300 and upper mold 400, the upper end of the first convex molds 311 is inserted into On to first in hole 411.Therefore, resin is not formed between the upper end and upper mold 400 of the first convex molds 311 can be around The gap entered, so as to prevent from forming resin in involutory surface 200 and inner side slot 204.

The manufacturing method of annular stator involved in an embodiment illustrated by the application has used the second convex molds 312 and upper mold 400, second convex molds 312 have the side being close to the outer peripheral surface of iron core interconnecting piece 21, and this The axial height of second convex molds 312 is higher than stator core 2, and the upper mold 400 is provided with for the second convex molds 312 Second convex molds 312, are inserted into the chamber formed by lower mold 300 and upper mold 400 by hole 412 on the second of upper end insertion It is interior, and carry out injection molding.

Since the axial height of the second convex molds 312 is higher than stator core 2, the upper end of the second convex molds 312 It is prominent from lower mold 300.On the other hand, it is formed with and hole 412 on the second convex molds 312 corresponding second in upper mold 400. Therefore, if if the mold involutory surface pairing of lower mold 300 and upper mold 400, the upper end of the second convex molds 312 is inserted into On to second in hole 412.Therefore, resin is not formed between the upper end and upper mold 400 of the second convex molds 312 can be around The gap entered, so as to prevent from forming resin in outer side channel 205.

In an embodiment illustrated by the application, to by bending single expansion stator 105 and making its both ends phase The example for the case where connecting and constituting annular stator 102 is illustrated.In contrast, in the present embodiment, to ring-type The case where stator 102 is made up of more than two segmentation stators 107 is illustrated.

Figure 21 is the outside drawing for indicating a configuration example of annular stator 102 involved in other embodiments, indicate from The appearance that axial top is observed.Annular stator 102 is made up of two segmentation stators 107 of connection.

Segmentation stator 107 is made of stator core 2, coil 3, connecting line 4 and insulating part 5.Also, stator core 2 is By iron core interconnecting piece 21 more than two segmentation iron cores 20 are connected and to be constituted, that is to say, that although segmentation stator The quantity of 107 segmentation iron core 20 is different, but has and the identical structure of expansion stator 105 shown in Fig. 4.

Annular stator 102 is constituted and connecting two segmentation stators 107 circlewise.That is, by will be different Segmentation stator 107 involutory surface 200 between face, and the Connection protrusion 23 for being set to an involutory surface 200 is received into and is set It is placed in the coupling recess portion 22 of another involutory surface 200 and connects segmentation stator 107.

When punch press process magnetic steel plate makes stator core 2, size corresponding with the length of stator core 2 is needed Stamping die, if but using annular stator 102, even if annular stator 102 is major diameter, it is fixed can also to shorten each segmentation of composition The length of the stator core 2 of son 107.Therefore, it is able to suppress the manufacturing cost of the stator of major diameter.

In addition, illustrating two points by connection tool there are four tooth socket in an embodiment illustrated by the application Stator 107 is cut come example the case where making annular stator 102 with eight tooth sockets, but the present invention is not limited in this way The case where, tooth socket number and segmentation number are arbitrary.For example, can also pass through four segmentation stators of tooth socket there are six connection tools 107 make the annular stator 102 with 24 tooth sockets.

In the respective embodiments described above, about yoke portion 2y and iron core interconnecting piece 21, upper surface is covered by insulating part 5, A part of lower surface is not illustrated by the example of annular stator 102, segmentation stator 107 that insulating part 5 covers, still The present invention is not limited to such situations.That is, also can be with the upper surface of yoke portion 2y and iron core interconnecting piece 21 under Surface is all covered by insulating part 5, and the mode that stator core 2 does not expose is constituted.By adopting such structure, in the upper of yoke portion 2y Surface configuration have upper connecting line 4U, lower surface configured in the case where lower connecting line 4D, can prevent connecting line 4U and under Any one in connecting line 4D is contacted with stator core 2, and can shorten the distance between stator core 2, so as to Shorten the axial dimension of motor M.

In the respective embodiments described above, to there is upper connecting line 4U of the configuration above the axial direction of yoke portion 2y and configuration in yoke The annular stator 102 of the lower connecting line 4 of the axial lower section of portion 2y, the example for dividing stator 107 are illustrated, but of the invention It is not limited solely to such situation.That is, having upper connecting line 4U that can also be applicable in without the stator of lower connecting line 4D The present invention.

Claims

1. a kind of manufacturing method of motor stator, which is characterized in that

The motor is included with stator

Band-like iron core is at least one, and the band-like iron core passes through the iron by more than two segmentation iron cores by means of bending Core interconnecting piece connects；And

Insulating part is close to by insert-molding and with the surface of the band-like iron core,

The segmentation iron core includes

Yoke portion, circumferentially；And

Teeth portion extends from the yoke portion towards radially inner side,

The circumferential end in the yoke portion is connect with the iron core interconnecting piece,

The radial center of the iron core interconnecting piece is located at the position that radial outside is leaned on than the radial center in the yoke portion,

There is inner side slot in the radially inner side of the iron core interconnecting piece,

There is involutory surface in the circumferential end faces of the radially inner side positioned at the iron core interconnecting piece in the yoke portion,

Opposed in the circumferential two involutory surface that two adjacent segmentation iron cores are respectively provided in the circumferential Interval is smaller than the circumferential width of the iron core interconnecting piece,

The manufacturing method of the motor stator is characterized in that,

Prepare upper mold, lower mold and the first convex molds,

The axial height of first convex molds is higher than the band-like iron core,

The upper mold is provided with hole on supply the upper end of first convex molds to be inserted into first,

Intracavitary being formed by the upper mold and the lower mold, opposite each other two of the band-like iron core are described right Conjunction face is configured to towards the open V-shape of radially inner side,

The lower mold is close to the involutory surface at the both ends of the band-like iron core,

First convex molds are close to along the involutory surface of V-shape and are inserted into the inner side slot,

The upper end of first convex molds is inserted on the first of the upper mold in hole, the upper mold relative to it is described The upper surface interval of the adjacent involutory surface adjacent area of involutory surface and the iron core interconnecting piece,

By the lower mold and the upper mold formed it is intracavitary to the band-like iron core together with the first convex molds into Row injection molding.

2. the manufacturing method of motor stator according to claim 1, which is characterized in that

The second convex molds and the upper mold are used, second convex molds have the periphery with the iron core interconnecting piece The side that face is close to, and the axial height of second convex molds is higher than the band-like iron core,

The upper mold is provided with hole on supply the upper end of second convex molds to be inserted into second,

Second convex molds are inserted into and are formed by the lower mold and the upper mold intracavitary, and carry out injection molding.

3. a kind of motor stator is fabricated using the manufacturing method of motor stator described in as claimed in claim 1 or 22, It is characterized in that,

It is equipped with coil across the insulating part in the teeth portion,

In the top in the yoke portion, across the connecting line of more than two segmentation iron cores circumferentially by from the coil It draws,

The insulating part includes

Tooth insulation division covers the coil fitting surface of the teeth portion；And

Yoke insulation division covers the upper surface in the yoke portion and the upper surface of the iron core interconnecting piece,

The upper table in the part of the upper surface of the covering iron core interconnecting piece of the yoke insulation division yoke portion adjacent with covering The part in face is connected.

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

The radial center of the iron core interconnecting piece is located at the position that radial outside is leaned on than the radial center in the yoke portion, and in institute The circumferential end faces for stating the radially inner side positioned at the iron core interconnecting piece in yoke portion have involutory surface,

Opposed in the circumferential two involutory surface that two adjacent segmentation iron cores are respectively provided in the circumferential it Between interval it is smaller than the circumferential width of the iron core interconnecting piece, the radially inner side of the involutory surface and the iron core interconnecting piece Face is not covered by the insulating part.

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

The insulating part has the wiring supporting part extended from the yoke insulation division towards axial top, in the wiring supporting part Radial outside there is guiding groove circumferentially, the connecting line configuration is in the guiding groove.

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

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

At least one of described wiring supporting part has more than two guiding grooves, configured with not in the guiding groove The same connecting line.

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

There is the outer side slot axially extended in the outer peripheral surface of the iron core interconnecting piece.

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

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

A circumferential end face for the band-like iron core is provided with circumferentially Connection protrusion outstanding, in the band-like iron core Another circumferential end face is provided with the coupling recess portion being circumferentially recessed, and the Connection protrusion is contained in same or different In the coupling recess portion of the band-like iron core.

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

It is any in the lower surface, the lower surface of the iron core interconnecting piece and the lower surface of the Connection protrusion in the yoke portion One side is provided with the exposed surface not covered by the insulating part.

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

13. motor stator according to claim 9, which is characterized in that

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

Outer peripheral surface in the yoke portion has the positioning groove portion that vertically extends, the inner peripheral surface of the positioning groove portion be not by The exposed surface of the insulating part covering.

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

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

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

The insulating part has winding guide portion, which is prominent from the tooth insulation division towards axial up and down direction Plate position, it is described winding guide portion inner peripheral surface be located at than the teeth portion inner peripheral surface lean on radial outside position, institute Stating insulating part includes the upper surface for covering the teeth portion between the inner peripheral surface of the teeth portion and the inner peripheral surface of the winding guide portion Tooth end insulation portion.

18. motor stator according to claim 17, which is characterized in that

At least part that the position of the inner peripheral surface of guide portion in the inner part is wound described in ratio in the lower surface of the teeth portion is not The exposed surface covered by the insulating part.

19. motor stator according to claim 17, which is characterized in that

Gate vestiges of the insulating part when the inner peripheral surface of the winding guide portion is formed with injection molding.

20. motor stator according to claim 17, which is characterized in that

The insulating part covers the lower surface in the yoke portion and the lower surface of the iron core interconnecting piece.