CN117277719A

CN117277719A - Motor structure and fan

Info

Publication number: CN117277719A
Application number: CN202210672433.6A
Authority: CN
Inventors: 高伟; 李剑雄
Original assignee: GD Midea Environment Appliances Manufacturing Co Ltd
Current assignee: GD Midea Environment Appliances Manufacturing Co Ltd
Priority date: 2022-06-15
Filing date: 2022-06-15
Publication date: 2023-12-22

Abstract

The embodiment of the invention provides a motor structure and a fan, wherein the motor structure comprises: a housing in which a receiving chamber is formed; the stator assembly is arranged in the accommodating cavity; the rotor assembly is arranged in the accommodating cavity, the rotor assembly and the stator assembly are coaxially arranged, the rotor assembly is arranged on the radial outer side of the stator assembly, the rotor assembly comprises a fixing piece and a rotor shaft penetrating through a shaft hole of the fixing piece, and a permanent magnet is arranged in the fixing piece; wherein, mounting, rotor shaft and permanent magnet are integrative injection moulding, are equipped with slide bearing on the casing, and rotor shaft cooperatees with slide bearing. According to the technical scheme, the sliding bearing is adopted as the bearing, and the connection can be realized only by clearance fit between the sliding bearing and the rotor shaft, so that the production cost is greatly reduced compared with that of the rolling bearing on one hand, and the precision of the bearing chamber and the rotor shaft and the precision requirement of production equipment can be reduced by utilizing the characteristics of the sliding bearing on the other hand.

Description

Motor structure and fan

Technical Field

The invention relates to the technical field of motors, in particular to a motor structure and a fan.

Background

At present, the existing brushless direct current motor adopts a ball bearing structure, but due to bearing characteristics, the requirements on parameters such as the diameter and roundness of a motor bearing chamber, concentricity of two bearing chambers, precision of a rotor shaft and the like, and the mounting equipment and production process requirements of the bearing are relatively high, and meanwhile, additional glue coating is needed between the bearing outer ring and the bearing chamber, so that the processing procedure and the production cost are increased.

Disclosure of Invention

The present invention aims to solve at least one of the technical problems existing in the prior art or related art.

In view of this, embodiments of the first aspect of the present invention provide a motor structure.

Embodiments of the second aspect of the present invention provide a blower.

To achieve the above object, an embodiment of a first aspect of the present invention provides a motor structure, including: a housing in which a receiving chamber is formed; the stator assembly is arranged in the accommodating cavity; the rotor assembly is arranged in the accommodating cavity, the rotor assembly and the stator assembly are coaxially arranged, the rotor assembly is arranged on the radial outer side of the stator assembly, the rotor assembly comprises a fixing piece and a rotor shaft penetrating through a shaft hole of the fixing piece, and a permanent magnet is arranged in the fixing piece; wherein, mounting, rotor shaft and permanent magnet are integrative injection moulding, are equipped with slide bearing on the casing, and rotor shaft cooperatees with slide bearing.

According to the motor structure provided by the embodiment of the invention, the motor structure comprises a shell, a stator assembly and a rotor assembly, wherein the stator assembly and the rotor assembly are positioned in the shell, the shell plays a certain role in protection and accommodation, the rotor assembly can rotate relative to the stator assembly, and it can be understood that the stator assembly and the rotor assembly are coaxially arranged in order to ensure the normal rotation of a rotor shaft.

It is emphasized that, because the bearing for supporting the rotor shaft in the first shell and the second shell is selected as the sliding bearing, the connection can be realized only by the clearance fit between the sliding bearing and the rotor shaft, on one hand, compared with the rolling bearing, the production cost is greatly reduced, and on the other hand, the characteristics of the sliding bearing are utilized, and in the scheme, the precision requirements of the bearing chamber, the rotor shaft and the production equipment can be reduced.

Further, the rotor shaft is passed out of the first housing only through a sliding bearing on the housing so as to add a load to the passed-out portion, such as a structure of a fan or the like. And through all setting up slide bearing on two casings, can play certain supporting effect on both ends to the rotor shaft, the axiality at both ends when guaranteeing to rotate also is convenient for reduce the shake when rotating.

For the rotor assembly, the motor mainly comprises a fixing piece, a rotor shaft and a permanent magnet which are integrally injection molded, wherein the fixing piece mainly plays a supporting role, and the positions of the rotor shaft and the permanent magnet are fixed, so that the motor using the rotor assembly can ensure the integral rotation stability of the rotor assembly in the operation process. Specifically, the shaft hole is formed in the fixing piece, the rotor shaft is connected to the fixing piece through the shaft hole, on the basis, the permanent magnet is arranged in the fixing piece, and the rotor assembly is integrated by injection molding and fixing the rotor shaft, the rotor shaft and the permanent magnet are simplified in processing operation due to the fact that the fixed connection between the rotor shaft and the permanent magnet is achieved through injection molding of the die, and concentricity between the rotor shaft and the permanent magnet can be guaranteed after processing is completed.

It is emphasized that, because the material of the mounting of fixed rotor shaft and permanent magnet is plastics, compare in the material cost and the processing cost of the mounting of metal material all can show to reduce, but self intensity can receive the influence, however, because in this scheme be through the realization of moulding plastics between mounting and rotor shaft and the permanent magnet, the three integration after moulding plastics, so can satisfy normal motor operation demand.

In addition, it should also be emphasized that, because the mounting in this application selects the plastics material, can adopt halbach radial magnetization to the permanent magnet this moment, radially magnetizes in the injection mould through rare earth material such as samarium cobalt material, adopts non-magnetic conduction material to guarantee that the excircle does not have magnetic line of force through the mould outer lane, and the present rotor outer lane need not extra magnetic conduction material to provide the magnetic circuit, can change into cheaper and lightweight plastics or other material substitution.

In the above technical scheme, the mounting specifically includes: a connecting end wall; the rotor shaft hole pipe is arranged on the connecting end wall, and a shaft hole is formed in the rotor shaft hole pipe; the matching side wall is connected with the connecting end wall and extends along the axial direction of the shaft hole by the connecting end wall, and an opening is formed at one end of the matching side wall far away from the connecting end wall.

In this technical scheme, the mounting mainly includes connecting end wall, rotor shaft hole pipe and cooperation lateral wall, and wherein connecting end wall and cooperation lateral wall are connected, and rotor shaft hole pipe is then additionally set up on connecting end wall, because the shaft hole need be seted up in the rotor shaft hole pipe, so rotor shaft hole pipe's extending direction is axial promptly. The arrangement of the rotor shaft hole pipe can guide and limit the rotor shaft in the axial direction, limit the offset of the rotor shaft, and the other end of the rotor shaft hole pipe is connected with the connecting end wall through one end of the matched side wall, so that the stator structure can be assembled inwards through the opening, and the assembly of the motor structure is completed.

Further, the rotor shaft bore tube needs to be perpendicular to the connecting end wall, the rotor shaft bore tube being located at the rotational center of the connecting end wall.

In the above technical solution, further includes: the permanent magnet is in the shape of halbach magnetic ring.

In the technical scheme, the permanent magnets are selected to be in a magnetic ring shape, specifically halbach magnetic rings, so that the outer ring magnetic field of the rotor is shielded, namely, an additional magnetic conduction structure is not needed, an original magnetic conduction component on the rotor can be omitted, the rotor is injection-molded with the rotor shaft and the permanent magnets together through integral injection molding, and the whole production process of the rotor is simplified.

Further, the permanent magnet can be a complete ring shape or a ring structure formed by a plurality of arc-shaped magnetic strips.

In the above technical solution, further includes: the reinforcing rib is arranged on one side of the connecting end wall away from the matched side wall; one end of each reinforcing rib is connected with the rotor shaft hole pipe, and the other end of each reinforcing rib extends outwards along the radial direction of the shaft hole.

In the technical scheme, the strength of the fixing piece can be enhanced by arranging the reinforcing rib on the other side of the connecting end wall, namely, arranging the reinforcing rib on the side of the connecting end wall away from the matched side wall. It can be understood that the fixing piece is formed by connecting the rotor shaft and the permanent magnet together through injection molding, and the strength of the material of the fixing piece is not high, so that in some design requirements with high strength requirements, the strength of the whole structure needs to be enhanced by the reinforcing ribs, and different motor requirements are met.

Further, the reinforcing rib is arranged on the outer side so as to reduce interference to the position of the permanent magnet. In addition, the reinforcing ribs extend in the radial direction, one end of the reinforcing ribs is directly connected to the rotor shaft hole pipe, and the other end of the reinforcing ribs extends towards the outer side in the circumferential direction.

In the above technical solution, further includes: and the radiating holes are arranged on the connecting end wall, and at least one radiating hole is arranged between two adjacent reinforcing ribs.

In this technical scheme, through set up the louvre on the connecting end wall, can make the rotor subassembly take place the heat that produces when rotating and outwards discharge through the louvre to realize the inside ventilation heat dissipation demand of motor.

Further, since the reinforcing ribs are provided on the connecting end wall, the positions of the reinforcing ribs need to be considered when determining the positions of the heat dissipating holes, and in a specific embodiment, at least one heat dissipating hole is located between two reinforcing ribs, that is, at least one heat dissipating hole is located offset from the reinforcing ribs.

In another embodiment, all of the heat dissipating holes are offset from the stiffener.

In the above technical solution, further includes: the boss is arranged on one side of the connecting end wall, close to the matched side wall, and is formed by extending the connecting end wall along the axial direction of the shaft hole towards the opening; wherein, boss and permanent magnet butt.

In this technical scheme, through setting up the boss in the inboard of connecting the end wall, namely be close to one side of cooperation lateral wall, can fix the permanent magnet, specifically, the boss is by connecting the end wall along the inwards protruding formation that extends of axial, when placing the permanent magnet, can directly place on the boss to make boss and permanent magnet offset, the boss can play certain spacing fixed action to the permanent magnet.

In the above technical solution, further includes: at least one clamping groove arranged on the rotor shaft; knurling, which is arranged on the outer wall of the rotor shaft along the circumferential direction of the rotor shaft; wherein, the draw-in groove extends along the axial or circumference of rotor shaft.

In this technical scheme, through set up axial or circumference extension's draw-in groove on the rotor shaft, can adjust the axial cohesion of complex between rotor shaft and the mounting under the effect of draw-in groove, and through setting up circumferential annular knurl, thereby the quantity and the degree of depth of accessible adjustment annular knurl adjust the size of circumferential cohesion to satisfy different design demands, assembly demand and user demand.

In the above technical scheme, the casing specifically includes: the first shell and the second shell are detachably connected, and the first shell and the second shell are connected to form a containing cavity; wherein, all be equipped with slide bearing on first casing and the second casing, the one end of rotor shaft outwards stretches out through first casing.

In this technical scheme, the casing is including first casing and second casing, be detachable connection between two casings to be convenient for install on the one hand, on the other hand is also convenient for examine and repair operations such as change inner structure, when first casing and second casing link to each other, can enclose into one between two casings and hold the chamber, for stator module and rotor module to place, first casing and second casing can play certain guard action to inside stator module and rotor module this moment, have also improved the security in the operation simultaneously.

In the above technical scheme, the stator assembly specifically includes: the fixed seat is provided with a stator shaft hole pipe, and the outer side wall of the stator shaft hole pipe is provided with a matching rib; the stator iron core is sleeved outside the stator shaft hole pipe and comprises a plurality of stator teeth which are circumferentially arranged along the axis of the stator shaft hole pipe; the stator winding is wound on the stator teeth; wherein, the material of fixing base is plastics.

In this technical scheme, stator module, including fixing base, stator core and stator winding, wherein, the fixing base mainly plays the supporting role, fixes stator core's position to make the motor of using stator module in the operation in-process, can guarantee stator core's position stability. The stator core mainly comprises a plurality of stator teeth, the plurality of stator teeth are circumferentially distributed, and stator windings are wound on each stator tooth, so that the stator assembly can generate a magnetic field when being electrified, and the stator assembly is favorable for driving the rotor to rotate.

It is emphasized that, because the material of fixing stator core's fixing base is plastics, compare in metal support's cost and have apparent reduction, but self intensity can receive the influence, however, because in this scheme the fixing base only is used for fixing stator core, does not take place to remove, only need with stator core's position restriction in end cover department can.

The technical scheme comprises the following steps: the insulating layer is arranged on the surface of the stator core, and the stator winding is wound on the insulating layer.

In the technical scheme, the insulation treatment, namely the arrangement of the insulation layer, is performed on the stator core, so that the winding of the stator winding can be insulated.

Further, the insulating layer can be made of PBT or nylon material, and the thickness of the insulating layer can be 0.3-1 mm.

In the above technical solution, further includes: the circuit board is detachably connected with the fixing seat; the clamping rib is arranged on the fixing seat and used for limiting the position of the circuit board relative to the fixing seat.

In the technical scheme, the position of the circuit board can be limited by arranging the circuit board detachably connected with the fixing seat and arranging the clamping ribs on the fixing seat. Specifically, because the fixing base selects the plastics material in this application, when joining in marriage with the circuit board, mainly adopt the structure of screens muscle, go into the circuit board card on the fixing base to realize the detachable connection to the circuit board, adopt this kind of mode, when the circuit board takes place to damage, need not to change the stator is whole, but can change the circuit board alone, very big reduction cost of maintenance reduces unnecessary wasting of resources.

The position and the specific shape of the clamping rib are not limited, and the position of the circuit board on the fixing seat can be limited, so that the circuit board cannot be separated.

In the technical scheme, one end of the fixing seat is provided with a first boss, the first boss is provided with a second boss, the stator shaft hole pipe is arranged at one end of the second boss, and the second boss is provided with a clamping rib; one end of circuit board is equipped with the cooperation fin, and the cooperation fin stretches into the space between screens muscle and the first boss, and motor structure still includes: the first connecting hole is arranged on the circuit board; the second connecting hole is correspondingly arranged on the first boss with the first connecting hole; the connecting piece passes through the first connecting hole and the second connecting hole to realize connection between the circuit board and the first boss.

In this technical scheme, the one end of fixing base has formed with first boss, second boss and stator axle hole pipe in proper order, adopts the shape of a plurality of bosses for the body structure of fixing base is more even to the transition between the position of stator axle hole pipe, can not have the lower possibility of local structural strength, guarantees the holistic intensity of fixing base.

Further, a clamping rib is arranged on the second boss so as to clamp the circuit board into the position, and meanwhile, the shaft hole pipe is arranged at one end of the second boss, and the second boss is away from one end of the first boss so as to be matched with the stator core.

One end of circuit board self is provided with the cooperation fin, mainly in the cooperation of screens muscle, in the space between screens muscle and the first boss is gone into to the card, on this basis, still is provided with two kinds of corresponding connecting holes, first connecting hole and second connecting hole promptly, wherein, first connecting hole sets up on the circuit board, the second connecting hole sets up on first boss, available connecting piece passes first connecting hole and second connecting hole to be connected to on the first boss with the circuit board, guarantee joint strength.

It should be emphasized that the first connecting hole and the second connecting hole may be through holes, threaded holes, and the connecting piece may be a pin, or a screw, which may be flexibly selected according to specific design requirements and installation simplicity.

Furthermore, the lead-out groove can be arranged on the circuit board, and the lead-out wire of the motor can be led out through the lead-out groove, so that the possibility of excessive bending or excessive extension of a circuit caused by position interference is reduced, and the arrangement of motor circuits is facilitated.

It will be appreciated that one or both sides of the circuit board may be provided with the necessary electronic components, and the power supply or circuit connection thereof may require physical wires under certain circumstances, where the lead-out slot may provide space for structures such as external power sources, control boards, etc., as well as space for wires between internal components.

In the above technical solution, further includes: the positioning rib is arranged on the outer wall of the stator shaft hole pipe along the axial direction of the stator shaft hole pipe.

In the technical scheme, the stator core sleeved outside the stator shaft hole pipe can have a certain positioning effect by arranging the axially extending positioning ribs on the stator shaft hole pipe, so that the subsequent assembly efficiency is improved. The positioning ribs can also have the effect of improving the structural strength, meanwhile, the friction between the positioning ribs and the stator core is enhanced, and the glue solidification is facilitated.

In the above technical solution, further includes: the matching rib is arranged on the outer wall of the stator shaft hole pipe along the axial direction of the stator shaft hole pipe; wherein, the height of the outer wall of the protruding stator axle hole pipe of cooperation muscle is less than the height of the outer wall of the protruding stator axle hole pipe of location muscle.

In this technical scheme, still be provided with the cooperation muscle of axial extension on stator shaft hole pipe, the extending direction the same with the location muscle, but its height is lower, and the cooperation muscle is mainly in order to improve the contact area of glue and stator shaft hole pipe and stator core when inwards filling glue after installing stator core on the stator shaft hole pipe, improves the intensity of connection.

And the matching rib can also play the effect of improving the structural strength, simultaneously also strengthen the friction with the stator core, and is more convenient for curing the glue.

In the above technical solution, further includes: and the positioning column is arranged at one end of the fixed seat, which is far away from the stator shaft hole pipe, and is used for being matched with the second shell.

In this technical scheme, through setting up one or more reference column on the fixing base, the concrete one end of keeping away from stator shaft hole pipe that sets up at the fixing base to in the one end of fixing base with the cooperation of second casing, the position and the form of restriction fixing base whole on the second casing are convenient for improve assembly efficiency on the one hand, on the other hand after accomplishing the assembly of a plurality of motors, the inside relative position of a plurality of motors is comparatively fixed, improves the unification of assembly.

Further, the connecting glue is filled between the stator core and the stator shaft hole pipe, so that the connection relation between the fixing seat adopting plastic and the stator core can be greatly improved, and the connection strength between the fixing seat and the stator core is also convenient to improve.

In the above technical solution, further includes: and the connecting hole is arranged on the end face of the second shell, and the positioning column is matched with the connecting hole.

In this technical scheme, through set up the connecting hole on the terminal surface of second casing, can realize the cooperation relation between fixing base and the second casing, can understand that in the outside of fixing base, be provided with the reference column promptly, keep away from the one end of stator axle hole pipe, then be provided with the connecting hole on the terminal surface of second casing, when stretching into the connecting hole with the reference column, can together fix the fixing base and other structures of stator module on the second casing to realize stator module's position fixing.

Among the above-mentioned technical scheme, be equipped with first bearing mounting mouth in the first casing, slide bearing is located first bearing mounting mouth, and motor structure still includes: the first bearing gland is arranged on one side, close to the second shell, of the sliding bearing and is matched with the first bearing mounting opening to form a first bearing chamber, and the sliding bearing is arranged in the first bearing chamber; the first bearing elastic piece is arranged in the first bearing chamber, and the first bearing elastic piece is arranged on one side of the sliding bearing, which is close to the first bearing gland.

In this technical scheme, be provided with first bearing mounting mouth in the first casing for place slide bearing, through additionally setting up corresponding bearing gland and bearing shell fragment, first bearing gland and first bearing shell fragment promptly, can provide certain pretightning force to slide bearing, in order to reduce braced system's vibration and noise, also can improve rotatory precision. Specifically, the first bearing gland is matched with the first bearing mounting opening, a first bearing chamber is formed after connection, a first bearing elastic piece is arranged in the first bearing chamber except for a sliding bearing, the first bearing elastic piece is arranged on the outer side of the sliding bearing, namely, one side close to the first bearing gland, when the first bearing gland is buckled, a certain pretightening force is generated on the sliding bearing, and the pretightening force can be flexibly adjusted according to different loads.

It will be appreciated that the first bearing mounting opening is for rotation of the rotor shaft and should therefore be positioned coaxially with the rotor shaft so that, upon placement of the slide bearing within the interior, the rotor shaft will normally be aligned with the inner edge of the slide bearing and cooperate therewith to effect normal rotation.

In the above-mentioned technical scheme, be equipped with the second bearing installation mouth in the second casing, slide bearing is located the second bearing installation mouth, and motor structure still includes: the second bearing cover is arranged on one side, close to the first shell, of the sliding bearing and is matched with the second bearing mounting opening to form a second bearing chamber, and the sliding bearing is arranged in the second bearing chamber; the second bearing elastic piece is arranged in the second bearing chamber, and the second bearing elastic piece is arranged on one side of the sliding bearing, which is close to the second bearing cover.

In the technical scheme, a second bearing mounting opening is formed in the second shell and used for placing the sliding bearing, and a certain pretightening force can be provided for the sliding bearing through additionally arranging a corresponding bearing gland and a corresponding bearing elastic piece, namely the second bearing gland and the second bearing elastic piece, so that vibration and noise of a supporting system are reduced, and the rotating precision can be improved. Specifically, the second bearing cover is matched with the second bearing mounting opening, a second bearing chamber is formed after connection, and at the moment, a second bearing elastic sheet is arranged in the second bearing chamber besides the sliding bearing, and a certain pretightening force is generated on the sliding bearing when the second bearing cover is buckled by arranging the second bearing elastic sheet on the outer side of the sliding bearing, namely, on one side close to the second bearing cover, so that the pretightening force can be flexibly adjusted according to different loads.

It will be appreciated that the second bearing mounting opening is for rotation of the rotor shaft and should be positioned coaxially with the rotor shaft so that the rotor shaft will normally align with and cooperate with the inner edge of the slide bearing after the slide bearing is placed therein.

In the above technical solution, further includes: one of the matching groove and the matching bulge is arranged on the first shell, the other is arranged on the second shell, and the first shell and the second shell are connected through the matching of the matching groove and the matching bulge.

In this technical scheme, through setting up cooperation recess and cooperation arch to be convenient for realize the connection between first casing and the second casing, specifically, through recess and bellied cooperation, can make first casing and second casing realize just to the cooperation when connecting, guarantee to connect.

Further, the position where the matching groove and the matching protrusion are arranged is the position where the two shells are in contact.

In a specific embodiment, the mating recess is provided on the first housing and the mating protrusion is provided on the second housing.

In another specific embodiment, the mating recess is provided on the second housing and the mating protrusion is provided on the first housing.

In the above technical solution, further includes: the tool positioning port is arranged on the end face circumferences of the first shell and the second shell; wherein, the position of frock locating hole on the first casing is relative with the frock locating hole on the second casing.

In the technical scheme, the fixture positioning ports are formed in the end faces of the first shell and the second shell so as to facilitate specific fixture positioning operations, including but not limited to riveting and other fixtures. It should be noted that the tool positioning openings are arranged at the peripheral edge, and the positions of the tool positioning openings on the two shells are opposite, so that the tool positioning openings on the two shells can be just overlapped when the first shell and the second shell are connected, and the subsequent tool positioning effect is ensured.

The specific shape of the tool positioning opening can be polygonal, arc-shaped or semicircular and the like.

Embodiments of the second aspect of the present invention provide a fan, comprising: a housing; any of the above-described motor structures of the first aspect, disposed within the housing.

The fan provided by the invention comprises the shell and the motor structure arranged in the shell, and the shell mainly plays a certain role in protecting the motor structure, and the motor structure is arranged in the shell, so that the fan has the beneficial effects of any motor structure in the embodiment of the first aspect, and the description is omitted herein.

Additional aspects and advantages of the invention will be set forth in part in the description which follows, or may be learned by practice of the invention.

Drawings

FIG. 1 shows an exploded schematic view of a motor structure according to one embodiment of the invention;

FIG. 2 shows a schematic structural view of a motor structure according to one embodiment of the invention;

FIG. 3 illustrates a schematic structural view of a rotor assembly according to one embodiment of the present disclosure;

FIG. 4 shows a schematic structural view of a rotor assembly according to one embodiment of the present invention;

FIG. 5 shows a schematic structural view of a fastener according to one embodiment of the present invention;

FIG. 6 shows a schematic structural view of a mount according to one embodiment of the present invention;

FIG. 7 shows a schematic structural view of a fastener according to an embodiment of the present invention;

fig. 8 shows a schematic structural view of a permanent magnet according to an embodiment of the present invention;

FIG. 9 shows a schematic structural view of a rotor shaft according to one embodiment of the present invention;

FIG. 10 shows a schematic structural view of a rotor shaft according to one embodiment of the present disclosure;

FIG. 11 shows a schematic diagram of the magnetization of a permanent magnet according to an embodiment of the present invention;

FIG. 12 illustrates a schematic structural view of a stator assembly according to one embodiment of the present invention;

FIG. 13 illustrates a schematic structural view of a stator assembly according to one embodiment of the present invention;

FIG. 14 shows a schematic structural view of a holder according to an embodiment of the present invention;

FIG. 15 shows a schematic structural view of a holder according to an embodiment of the present invention;

fig. 16 shows a schematic structural view of a circuit board according to an embodiment of the present invention;

fig. 17 shows a schematic structural view of a first housing according to an embodiment of the present invention;

fig. 18 shows a schematic structural view of a second housing according to an embodiment of the present invention;

FIG. 19 shows a schematic structural view of a blower according to an embodiment of the invention.

The correspondence between the reference numerals and the component names in fig. 1 to 19 is:

100: a motor structure; 1001: a housing; 1002: a first housing; 10022: a first bearing mounting port; 10024 first bearing gland; 10026: a first bearing spring plate; 1004: a second housing; 10042: a second bearing mounting port; 10044 second bearing caps; 10046: a second bearing elastic piece; 1006: a connection hole; 1008: fitting the protrusion; 1010: a mating groove; 1012: a tool positioning port; 1014: a sliding bearing; 1016: positioning the bulge; 1018: a positioning groove;

1100: a rotor assembly; 1102: a fixing member; 11022: a connecting end wall; 11024: a rotor shaft bore tube; 11025: a shaft hole; 11026: a mating sidewall; 11028: reinforcing ribs; 11030: a heat radiation hole; 11032: a boss; 1104: a rotor shaft; 11042: a clamping groove; 11044: knurling; 1106: a permanent magnet; 11082: a limit protrusion; 11084: a limit groove; 1110: damping pad; 1112: wear-resistant gaskets;

2100: a stator assembly; 2102: a fixing seat; 21022: a stator shaft bore tube; 21024: clamping ribs; 21026: a first boss; 21027: a second connection hole; 21028: a second boss; 21030: positioning ribs; 21032: matching ribs; 21034: positioning columns; 2104: a stator core; 21042: stator teeth; 21044: a stator winding; 2106: a circuit board; 21062: matching with fins; 21064: a first connection hole; 21066: a lead-out groove; 2110: a connecting piece;

300: a blower; 302: a housing.

Detailed Description

In order that the above-recited objects, features and advantages of embodiments of the present invention can be more clearly understood, a further detailed description of embodiments of the present invention will be rendered by reference to the appended drawings and detailed description thereof. It should be noted that, in the case of no conflict, the embodiments of the present application and the features in the embodiments may be combined with each other.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application, however, embodiments of the invention may be practiced otherwise than as described herein, and therefore the scope of the present application is not limited to the specific embodiments disclosed below.

Some embodiments according to the present invention are described below with reference to fig. 1 to 19.

Example 1

As shown in fig. 1 and 2, an electrical machine structure 100 according to this embodiment includes a casing, a stator assembly and a rotor assembly disposed in the casing, where the casing plays a role in protecting and accommodating the stator assembly and the rotor assembly inside, and the rotor assembly can rotate relative to the stator assembly. It will be appreciated that, in order to ensure the normal rotation of the rotor shaft 1104, the stator assembly 2100 and the rotor assembly 1100 are coaxially disposed, and the motor structure 100 adopting the outer rotor is adopted in the present embodiment, the rotor assembly 1100 is disposed on the circumferential outer side of the stator assembly 2100, and a changing magnetic field is formed under the action of the inner stator assembly 2100, so as to drive the rotor assembly 1100 to rotate, thereby realizing the rotation of the rotor shaft 1104.

It should be emphasized that, since the bearings supporting the rotor shaft 1104 in the first housing 1002 and the second housing 1004 are selected as the sliding bearings 1014, the connection can be achieved only by the clearance fit between the sliding bearings 1014 and the rotor shaft 1104, on one hand, compared with the rolling bearings, the production cost is greatly reduced, and on the other hand, the characteristics of the sliding bearings 1014 are utilized, in the scheme, the precision requirements of the bearing chamber, the rotor shaft 1104 and the production equipment can be reduced.

As shown in fig. 3 and fig. 4, for the rotor assembly 1100, the rotor assembly 1100 includes a fixing member 1102, a rotor shaft 1104 and a permanent magnet 1106, where the fixing member 1102 mainly plays a role in supporting, and fixes positions of the rotor shaft 1104 and the permanent magnet 1106, so that the motor using the rotor assembly 1100 can ensure that the whole rotor assembly 1100 rotates stably during operation. Specifically, the fixing member 1102 is provided with the shaft hole 11025, the rotor shaft 1104 is connected to the fixing member 1102 through the shaft hole 11025, on the basis, the permanent magnet 1106 is arranged inside the fixing member 1102, and the three parts are fixed by injection molding, so that the integrated rotor assembly 1100 is realized.

Further, as shown in fig. 3, a pair of shims, namely, a damper shim 1110 and a wear-resistant shim 1112, are provided at both ends of the rotor shaft 1104, respectively.

It should be emphasized that, because the material of the fixing member 1102 for fixing the rotor shaft 1104 and the permanent magnet 1106 is plastic, the material cost and the processing cost of the fixing member 1102 compared with those of the metal material are significantly reduced, but the strength of the fixing member 1102 is affected, however, in this scheme, the fixing member 1102, the rotor shaft 1104 and the permanent magnet 1106 are realized by injection molding, and the three are integrated after injection molding, so that the normal motor use requirement can be satisfied.

In addition, it should be emphasized that, because the fixing piece 1102 in the present application is made of plastic, the permanent magnet 1106 is radially magnetized by halbach, the rare earth material such as samarium cobalt is radially magnetized in the injection mold, the outer ring of the mold is made of non-magnetic material to ensure that the outer circle has no magnetic force lines, and the outer ring of the rotor does not need to be provided with magnetic circuit by using additional magnetic material, so that the rotor can be replaced by cheaper and lighter plastic or other materials.

Further, the fixing member 1102 mainly includes a connecting end wall 11022, a rotor shaft hole 11024 and a matching side wall 11026, wherein the connecting end wall 11022 and the matching side wall 11026 are connected, the rotor shaft hole 11024 is additionally disposed on the connecting end wall 11022, and the extending direction of the rotor shaft hole 11024 is the axial direction because the rotor shaft hole 11024 needs to be provided with a shaft hole 11025. The rotor shaft hole tube 11024 is provided to guide and limit the rotor shaft 1104 in the axial direction, to limit the offset of the rotor shaft 1104, and to form an opening at one end of the mating sidewall 11026 and the connecting end wall 11022, so that the stator structure can be assembled inwards through the opening, thereby completing the assembly of the motor structure 100.

Further, rotor shaft bore tube 11024 needs to be perpendicular to connecting end wall 11022, rotor shaft bore tube 11024 being located at the center of rotation of connecting end wall 11022.

Further, as shown in fig. 6 and 8, the strength of the fixing member 1102 can be enhanced by providing the reinforcing ribs 11028 on the other side of the connecting end wall 11022, that is, providing the reinforcing ribs 11028 on the side of the connecting end wall 11022 away from the mating side wall 11026. It can be appreciated that the fixing member 1102 itself connects the rotor shaft 1104 and the permanent magnet 1106 together by injection molding, and the strength of the material is not high, so in some design requirements with high strength requirements, the strength of the integral structure needs to be reinforced by the reinforcing ribs 11028, so as to meet different motor requirements.

Further, a reinforcing bar 11028 is provided on the outer side to reduce interference with the position of the permanent magnet 1106. Further, the reinforcing rib 11028 is radially extended, one end of which is directly connected to the rotor shaft hole pipe 11024, and the other end of which is extended toward the circumferential outside.

The heat dissipation holes 11030 are formed in the connecting end wall 11022, so that heat generated by the rotor assembly 1100 during rotation can be discharged outwards through the heat dissipation holes 11030, and accordingly ventilation and heat dissipation requirements of the motor are met.

Further, since the reinforcing ribs 11028 are provided on the connecting end wall 11022, the positions of the reinforcing ribs 11028 need to be considered in determining the positions of the heat dissipation holes 11030, and in a specific embodiment, at least one heat dissipation hole 11030 is located between two reinforcing ribs 11028, that is, at least one heat dissipation hole 11030 is located offset from the reinforcing ribs 11028.

In another embodiment, all of the heat sink holes 11030 are offset from the stiffener 11028.

In addition, a boss 11032 is disposed on the inner side of the connecting end wall 11022, that is, on the side close to the mating side wall 11026, so as to fix the permanent magnet 1106, specifically, the boss 11032 is formed by extending the connecting end wall 11022 inwards in the axial direction, and when the permanent magnet 1106 is placed, the boss 11032 is directly placed on the boss 11032, so that the boss 11032 abuts against the permanent magnet 1106, and the boss 11032 can play a certain limiting and fixing role on the permanent magnet 1106.

Further, the rotor shaft 1104 passes out of the first housing 1002 only through the sliding bearing 1014 on the housing to facilitate adding a load to the passed-out portion, such as a structure of a fan or the like. By providing the sliding bearings 1014 on both housings, a certain supporting effect can be achieved on both ends of the rotor shaft 1104, ensuring the coaxiality of both ends during rotation, and facilitating reduction of shake during rotation.

The permanent magnet 1106 is selected to be a magnetic ring, specifically a halbach magnetic ring, so that the outer ring magnetic field of the rotor is shielded, that is, no additional magnetic conduction structure is needed, thus the original magnetic conduction component on the rotor can be omitted, the rotor is injection molded with the rotor shaft 1104 and the permanent magnet 1106 together through integral injection molding, and the whole production process of the rotor is simplified.

Further, the permanent magnet 1106 may be a complete ring or a ring structure formed by a plurality of arc-shaped magnetic strips.

As shown in fig. 5, for the mating sidewall 11026 and the permanent magnet 1106, the position between the two is achieved by the limit protrusion 11082 and the limit groove 11084, wherein the shapes of the limit protrusion 11082 and the limit groove 11084 are matched, one of the two is arranged on the inner side of the mating sidewall 11026, and the other is arranged on the outer side of the permanent magnet 1106, so that the relative position of the permanent magnet 1106 in the mating sidewall 11026 is satisfied, and on the basis, the permanent magnet 1106 can be limited to a designated position on the fixing piece 1102 under the joint cooperation of the limit protrusion 11082 and the limit groove 11084.

In a specific embodiment, an axially or circumferentially extending clamping groove 11042 is provided on the rotor shaft 1104, so that the axial binding force between the rotor shaft 1104 and the fixing member 1102 can be adjusted under the action of the clamping groove 11042, and by providing circumferential knurls 11044, the number and depth of the knurls 11044 can be adjusted so as to adjust the size of the circumferential binding force, so as to meet different design requirements, assembly requirements and use requirements.

Further, as shown in fig. 9, a clamping groove 11042 and a knurling 11044 are provided on the rotor shaft 1104, wherein the clamping groove 11042 extends in the circumferential direction.

In another specific embodiment, as shown in FIG. 10, only axially extending detents 11042 are provided on rotor shaft 1104.

It should be noted that the housing 1001 includes: the first housing 1002 and the second housing 1004, specifically, the first housing 1002 and the second housing 1004 are detachably connected, so that on one hand, installation is convenient, on the other hand, maintenance, replacement and other operations on the internal structure are also convenient, when the first housing 1002 and the second housing 1004 are connected, an accommodating cavity is formed between the two housings so as to allow the stator assembly 2100 and the rotor assembly 1100 to be placed, and at the moment, the first housing 1002 and the second housing 1004 can play a certain role in protecting the internal stator assembly 2100 and the rotor assembly 1100, and meanwhile, safety in the running process is improved.

Example two

As shown in fig. 2, the motor structure 100 provided in this embodiment includes a first housing 1002, a second housing 1004, and a stator assembly 2100 and a rotor assembly 1100 located in the first housing 1002 and the second housing 1004, specifically, the first housing 1002 and the second housing 1004 are detachably connected, so that on one hand, installation is convenient, on the other hand, maintenance and replacement operations on the internal structure are also convenient, and when the first housing 1002 and the second housing 1004 are connected, a containing cavity is enclosed between the two housings for placing the stator assembly 2100 and the rotor assembly 1100, at this time, the first housing 1002 and the second housing 1004 can play a certain role in protecting the internal stator assembly 2100 and the rotor assembly 1100, and meanwhile, safety in the operation process is also improved. It will be appreciated that, in order to ensure the normal rotation of the rotor shaft 1104, the stator assembly 2100 and the rotor assembly 1100 are coaxially disposed, and the motor structure 100 adopting the outer rotor is adopted in the present embodiment, the rotor assembly 1100 is disposed on the circumferential outer side of the stator assembly 2100, and a changing magnetic field is formed under the action of the inner stator assembly 2100, so as to drive the rotor assembly 1100 to rotate, thereby realizing the rotation of the rotor shaft 1104.

For the stator assembly 2100, as shown in fig. 12, the stator assembly includes a fixing seat 2102, a stator core 2104 and a stator winding 21044, wherein the fixing seat 2102 mainly plays a supporting role to fix a position of the stator core 2104, so that a motor applying the stator assembly 2100 can ensure stability of the position of the stator core 2104 in an operation process. The stator core 2104 mainly comprises a plurality of stator teeth 21042, the plurality of stator teeth 21042 are circumferentially distributed, and stator windings 21044 are wound on each stator tooth 21042, so that the whole stator assembly 2100 can generate a magnetic field when being electrified, and the stator assembly is favorable for driving the rotor to rotate.

It should be emphasized that, because the material of the fixing seat 2102 for fixing the stator core 2104 is plastic, compared with the metal support, the cost is significantly reduced, but the strength of the fixing seat 2102 is affected, however, because the fixing seat 2102 is only used for fixing the stator core 2104 in the scheme, the fixing seat does not move, and only the position of the stator core 2104 is limited at the end cover.

The stator core is subjected to insulation treatment, namely an insulation layer is arranged, so that an insulation effect can be achieved on winding of the stator winding.

Further, by providing the circuit board 2106 detachably connected to the fixing base 2102 and providing the catching ribs 21024 on the fixing base 2102, the position of the circuit board 2106 can be restricted. Specifically, because the fixing base 2102 in this application selects the plastics material, when joining in marriage with circuit board 2106, mainly adopt the structure of screens muscle 21024, with circuit board 2106 card go into on the fixing base 2102 to realize the detachable connection to circuit board 2106, adopt this kind of mode, when circuit board 2106 takes place to damage, need not to change the stator is whole, but can change circuit board 2106 alone, very big reduction cost of maintenance reduces unnecessary wasting of resources.

As shown in fig. 14, one end of the fixing seat 2102 is sequentially formed with a first boss 21026, a second boss 21028 and a stator shaft hole tube 21022, and the shape of a plurality of bosses is adopted, so that the transition from the body structure of the fixing seat 2102 to the position of the stator shaft hole tube 21022 is uniform, the possibility of lower local structural strength is avoided, and the integral strength of the fixing seat 2102 is ensured.

Further, a detent rib 21024 is provided on the second boss 21028 to facilitate the latching of the circuit board 2106 into position, and the stator shaft hole tube 21022 is provided at one end of the second boss 21028, which is the end of the second boss 21028 away from the first boss 21026, to facilitate the mating with the stator core 2104.

The position and the specific shape of the positioning rib 21024 are not limited, so long as the position of the circuit board 2106 on the fixing seat 2102 can be limited, so that the circuit board 2106 cannot be separated.

One end of the circuit board 2106 is provided with a matching fin 21062 which is mainly matched with the clamping rib 21024 and clamped into a space between the clamping rib 21024 and the first boss 21026, and on the basis, two corresponding connecting holes 1006, namely a first connecting hole 21064 and a second connecting hole 21027 are further formed, wherein the first connecting hole 21064 is formed in the circuit board 2106, the second connecting hole 21027 is formed in the first boss 21026, and the connecting piece 2110 can penetrate through the first connecting hole 21064 and the second connecting hole 21027, so that the circuit board 2106 is connected to the first boss 21026, and the connecting strength is guaranteed.

It should be emphasized that the first connecting hole 21064 and the second connecting hole 21027 may be through holes, threaded holes, and the connecting piece 2110 may be pins, screws, or may be flexibly selected according to specific design requirements and installation simplicity.

As shown in fig. 16, an extraction slot 21066 is provided on the circuit board 2106, and the outgoing line of the motor can be led out through the extraction slot 21066, so that the possibility of excessive bending or excessive extension of the circuit caused by position interference is reduced, and the arrangement of motor lines is facilitated.

It will be appreciated that one or both sides of the circuit board 2106 may be provided with the necessary electrical components, which may require physical wiring for power or electrical connections, where the lead slots 21066 may provide space for external power, control board, etc. structures, as well as for wiring between internal components.

The stator shaft hole pipe 21022 is provided with the axially extending positioning ribs 21030, so that a certain positioning effect can be achieved for the stator core 2104 sleeved outside the stator shaft hole pipe 21022, and the subsequent assembly efficiency is improved. The positioning ribs 21030 can also have the effect of improving the structural strength, and meanwhile, the friction between the positioning ribs and the stator core 2104 is enhanced, so that the glue is more convenient to cure.

The stator shaft hole 21022 is also provided with an axially extending matching rib 21032 which has the same extending direction as the positioning rib 21030, but the height of the matching rib is lower, and the matching rib 21032 is mainly used for improving the contact area between the glue and the stator shaft hole 21022 and the contact area between the glue and the stator core 2104 when the glue is filled in after the stator core 2104 is mounted on the stator shaft hole 21022.

The matching ribs 21032 can also have the effect of improving the structural strength, and meanwhile, the friction between the matching ribs and the stator core 2104 is enhanced, so that the glue is more convenient to cure.

As shown in fig. 15, one or more positioning columns 21034 are disposed on the fixing base 2102, specifically disposed at an end of the fixing base 2102 far away from the stator shaft hole pipe 21022, so as to be matched with the second housing 1004 at an end of the fixing base 2102, and limit the position and the shape of the whole fixing base 2102 on the second housing 1004, so that on one hand, the assembly efficiency is improved, and on the other hand, after the assembly of a plurality of motors is completed, the internal relative positions of the motors are relatively fixed, and the assembly uniformity is improved.

Further, the connection glue is filled between the stator core 2104 and the stator shaft hole pipe 21022, so that the connection relation between the fixing seat 2102 adopting plastic and the stator core 2104 can be greatly improved, and the connection strength between the fixing seat and the stator core 2104 is also convenient to improve.

Example III

As shown in fig. 1 and 2, the motor structure 100 according to the present embodiment includes a first housing 1002, a second housing 1004, and a stator assembly 2100 and a rotor assembly 1100 disposed in the first housing 1002 and the second housing 1004, specifically, the first housing 1002 and the second housing 1004 are detachably connected, so that, on the one hand, installation is convenient, and on the other hand, maintenance and replacement of an internal structure are also convenient, and when the first housing 1002 and the second housing 1004 are connected, a housing cavity is enclosed between the two housings for placing the stator assembly 2100 and the rotor assembly 1100, and at this time, the first housing 1002 and the second housing 1004 can play a certain role in protecting the internal stator assembly 2100 and the rotor assembly 1100, and meanwhile, safety during operation is also improved. It will be appreciated that, in order to ensure the normal rotation of the rotor shaft 1104, the stator assembly 2100 and the rotor assembly 1100 are coaxially disposed, and the motor structure 100 adopting the outer rotor is adopted in the present embodiment, the rotor assembly 1100 is disposed on the circumferential outer side of the stator assembly 2100, and a changing magnetic field is formed under the action of the inner stator assembly 2100, so as to drive the rotor assembly 1100 to rotate, thereby realizing the rotation of the rotor shaft 1104.

Wherein, set up one or more reference column 21034 on fixing base 2102, specifically set up the one end of keeping away from stator shaft hole pipe 21022 at fixing base 2102 to in the one end of fixing base 2102 with second casing 1004 cooperatees, restrict fixing base 2102 wholly on second casing 1004's position and form, on the one hand be convenient for improve assembly efficiency, on the other hand after accomplishing the assembly of a plurality of motors, the inside relative position of a plurality of motors is comparatively fixed, improves the unification of assembly. On this basis, the connection hole 1006 is formed on the end face of the second housing 1004, so that the matching relationship between the fixing seat 2102 and the second housing 1004 can be realized, it can be understood that the positioning column 21034 is arranged on the outer side of the fixing seat 2102, that is, the end far away from the stator shaft hole pipe 21022, and the connection hole 1006 is formed on the end face of the second housing 1004, when the positioning column 21034 extends into the connection hole 1006, the fixing seat 2102 and other structures of the stator assembly 2100 can be fixed on the second housing 1004 together, so that the position fixing of the stator assembly 2100 can be realized.

Further, as shown in fig. 17, for the first housing 1002 and the second housing 1004, a first bearing mounting opening 10022 is provided in the first housing 1002 for placing the sliding bearing 1014, and by additionally providing a corresponding bearing gland and a bearing spring piece, that is, the first bearing gland 10024 and the first bearing spring piece 10026, a certain pre-tightening force can be provided to the sliding bearing 1014, so as to reduce vibration and noise of the support system, and also improve rotation precision. Specifically, the first bearing gland 10024 cooperates with the first bearing mounting opening 10022 to form a first bearing chamber after connection, and at this time, a first bearing spring plate 10026 is further disposed in the first bearing chamber besides the sliding bearing 1014, and by disposing the first bearing spring plate 10026 on the outer side of the sliding bearing 1014, that is, on the side close to the first bearing gland 10024, when the first bearing gland 10024 is fastened, a certain pre-tightening force is generated on the sliding bearing 1014, and the magnitude of the pre-tightening force can be flexibly adjusted according to different loads.

It will be appreciated that the first bearing mounting port 10022 is provided for rotation of the rotor shaft 1104 and should be positioned coaxially with the rotor shaft 1104 so that the rotor shaft 1104 can be properly aligned with and cooperate with the inner edge of the slide bearing 1014 after the slide bearing 1014 is placed therein.

As shown in fig. 18, a second bearing mounting opening 10042 is provided in the second housing 1004, for placing the sliding bearing 1014, and by additionally providing a corresponding bearing gland and bearing shrapnel, that is, the second bearing gland 10044 and the second bearing shrapnel 10046, a certain pretightening force can be provided to the sliding bearing 1014, so as to reduce vibration and noise of the support system, and also improve rotation precision. Specifically, the second bearing cap 10044 is matched with the second bearing mounting opening 10042, and a second bearing chamber is formed after connection, and at this time, a second bearing elastic sheet 10046 is further provided in the second bearing chamber besides the sliding bearing 1014, and by disposing the second bearing elastic sheet 10046 outside the sliding bearing 1014, that is, near one side of the second bearing cap 10044, a certain pre-tightening force is generated on the sliding bearing 1014 when the second bearing cap 10044 is fastened, and the magnitude of the pre-tightening force can be flexibly adjusted according to different loads.

It will be appreciated that the second bearing mounting port 10042 is provided for rotation of the rotor shaft 1104 and should be positioned coaxially with the rotor shaft 1104 so that the rotor shaft 1104 can be properly aligned with and cooperate with the inner edge of the slide bearing 1014 after the slide bearing 1014 is placed therein.

For the cooperation between the first casing 1002 and the second casing 1004, through setting up cooperation recess 1010 and cooperation protruding 1008 to in order to realize the connection between first casing 1002 and the second casing 1004, specifically, through the cooperation of recess and protruding, can make first casing 1002 and the second casing 1004 realize just to the cooperation when connecting, guarantee the connection.

Further, the position where the mating groove 1010 and the mating protrusion 1008 are disposed is the position where the two housings contact.

In a particular embodiment, the mating recess 1010 is provided on the first housing 1002 and the mating protrusion 1008 is provided on the second housing 1004.

In another particular embodiment, the mating recess 1010 is provided on the second housing 1004 and the mating protrusion 1008 is provided on the first housing 1002.

In addition, tooling locating openings 1012 are provided in the end faces of the first housing 1002 and the second housing 1004 to facilitate specific tooling locating operations, including but not limited to tooling such as staking. It should be noted that, the tooling positioning openings 1012 are disposed at the peripheral edge, and the positions of the tooling positioning openings 1012 on the two housings are opposite, so that when the first housing 1002 and the second housing 1004 are connected, the tooling positioning openings 1012 on the two housings can be exactly overlapped, and the subsequent tooling positioning effect is ensured.

The specific shape of the tool positioning opening 1012 may be polygonal, arc-shaped or semicircular, etc.

Example IV

As shown in fig. 6, the present application further proposes a specific embodiment, and an external rotor brushless dc motor is provided: consists of four parts, namely a front end cover assembly (i.e., a first housing 1002), a rotor assembly 1100, a stator assembly 2100, and a rear end cover assembly (i.e., a second housing 1004).

The front end cover assembly includes components such as a tension end cover (i.e., the first housing 1002), an oil-retaining bearing (i.e., the sliding bearing 1014), a bearing dome (i.e., the first bearing dome 10026), a bearing gland (i.e., the first bearing gland 10024), lubrication oil, a central shaft, and the like. The front end cover center position is installed and fixed with ball-type oiliness bearing to annotate lubricating oil, and outside boss 11032 position riveting is used for installing the center pin of fixing at the fan aircraft nose, and the end cover flange turn-ups position is provided with 4 or 6 locating holes (i.e. locating groove 1018) that are used for with the location of rear end cover subassembly, 4 or 6 buckles (i.e. cooperation arch 1008) that rivet usefulness for the semicircle breach (i.e. frock locating hole 1012) of riveting frock location.

For the rear end cap assembly, the components such as the stretch cap (i.e., second housing 1004), the oil bearing (i.e., slide bearing 1014), the bearing dome (i.e., second bearing dome 10046), the bearing gland (i.e., second bearing cap 10044), the lubricating oil, etc. The center position of the rear end cover is fixedly provided with a spherical oil-containing bearing and is filled with lubricating oil, the outer circle of the flange plate is provided with a semicircular notch (namely a tool positioning port 1012) for positioning a tool, a plurality of clamping grooves (namely a matching groove 1010) for matching with the clamping position of the front cover, a boss (namely a positioning boss 1016) for positioning the front cover, and 3 positioning holes (namely a connecting hole 1006) for positioning a fixing seat 2102 are formed in the end face of the boss, and turning screw holes for mounting the stator assembly 2100 are formed.

In addition, for the rotor assembly 1100, it is comprised of a rotor shaft 1104, a magnetic ring (i.e., permanent magnets 1106), injection molded connectors 2110 (i.e., fixtures 1102), shock absorbing shims, and wear resistant shims 1112. The rotor permanent magnet 1106 is radially magnetized by adopting halbach, rare earth materials such as samarium cobalt materials are radially magnetized in an injection mold, the outer circle of the rotor permanent magnet 1106 is ensured to be free of magnetic lines by adopting non-magnetic conductive materials through the outer ring of the mold, as shown in fig. 11, the rotor outer ring is realized without providing a magnetic circuit by adopting additional magnetic conductive materials, and the rotor permanent magnet can be replaced by cheaper and lighter plastic or other materials. The rotor shaft 1104 and the permanent magnet 1106 magnetic ring are molded into an integrated rotor by injection molding through PBT or nylon materials, and in order to ensure that the rotor shaft 1104 and the rotor can transmit enough torque, the wrapping part of the rotor and the rotor shaft 1104 covers the whole axial dimension L, as shown in fig. 7, L=motor axial dimension-2 x damping gasket thickness-2 x wear pad thickness-motor play value. Meanwhile, knurling 11044 is added at the middle position of the rotor shaft 1104, which is wrapped by the injection molding connecting piece 2110, grooves are formed in the middle position of the knurling 11044, the groove width is 1 mm-5 mm, the groove depth is 0.5 mm-1.5 mm, and a plurality of grooves can be formed in consideration of the binding force. The bottom of the injection molding connecting piece 2110 is provided with a plurality of hole sites (namely heat dissipation holes 11030) for heat dissipation, the end face is provided with a plurality of reinforcing ribs, the reinforcing ribs play a role in reinforcing strength, the effect of a heat dissipation fan is played in the rotation process of the rotor, and the heat dissipation effect of the motor is played by combining the heat dissipation holes 11030.

And for the stator assembly 2100, as shown in fig. 13, it is composed of a circuit board 2106, fixing screws (i.e., connectors 2110), a stator core 2104, winding coils (i.e., stator windings 21044), and a mounting fixture 2102 (i.e., fixture 2102). The circuit board 2106 is provided with protruding fins (i.e., mating fins 21062) for inserting into the slots 11042 of the fixing base 2102, screw holes, and slots (i.e., lead slots 21066) for threading out the motor. The stator core 2104 is composed of a core laminated by punching and an insulating layer integrally molded by PBT or nylon materials, and the thickness of the insulating layer is controlled to be 0.3 mm-1.0 mm according to the insulation and pressure resistance requirements. The circuit board 2106 controlled by the motor is arranged on the fixing seat 2102, two clamping positions (namely clamping ribs 21024) are arranged on the outer circle of the middle cylinder of the fixing seat 2102 and used for clamping the circuit board 2106, a plane is arranged at the tangent position of the cylindrical surface in contact with the inner circle of the circuit board 2106 and used for preventing the circuit board 2106 from rotating after being arranged, a screw hole is further formed in the fixing seat 2102, and the circuit board 2106 is locked by the self-tapping screw driven by the screw hole. The stator around which the line is wound is installed at the cylindrical extension end of the fixing seat 2102, and is positioned in the circumferential direction through a plurality of large ribs (namely, positioning ribs 21030), and is in interference fit through a plurality of small ribs (namely, matching ribs 21032), so that the cylindrical outer circle of the whole fixing seat 2102 is prevented from being deformed due to stress. After the stator is installed, the winding leads are soldered to pads on circuit board 2106. Finally, the whole stator assembly 2100 is installed and fixed on the rear end cover through a fixing seat 2102, and in order to ensure concentricity and position of the stator assembly 2100 and the bearing position of the end cover, three positioning columns 21034 are arranged on the fixing seat 2102 and used for positioning, and screws are driven into the fixing seat through screw holes to fix the stator assembly.

According to the specific embodiment provided by the invention, by adopting an oil-containing (sliding) bearing structure scheme, the requirements of the motor rotor shaft 1104, the bearing chamber precision and the bearing mounting process and equipment are all greatly reduced, so that the cost is greatly reduced, and the production cost is reduced. The rotor realizes halbach magnetic field arrangement through a magnetizing process, an external magnetic conduction component is omitted, and the rotor magnetic ring and the rotor shaft 1104 are molded together through a plastic coating process, so that the production process is simplified, and the cost is reduced. The iron core is insulated by adopting a plastic coating process, so that the insulation cost is greatly reduced. The stator assembly 2100 is mounted and secured to the end cap by injection molded plastic anchor seat 2102, reducing mold and part costs.

Example five

As shown in fig. 19, the fan 300 provided in this embodiment includes a housing 302 and a motor structure 100 disposed in the housing 302, where the housing 302 mainly protects the motor structure 100, and since the motor structure 100 is disposed in the housing 302, the fan has the beneficial effects of any one of the motor structures 100 in the first embodiment, which is not described herein again.

According to the motor structure and the fan provided by the invention, the bearings are selected as the sliding bearings, and the connection can be realized only by clearance fit between the sliding bearings and the rotor shaft, so that the production cost is greatly reduced compared with that of the rolling bearings on one hand, and the precision of the bearing chamber and the rotor shaft and the precision requirement of production equipment can be reduced by utilizing the characteristics of the sliding bearings on the other hand.

In the present invention, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance; the term "plurality" means two or more, unless expressly defined otherwise. The terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; "coupled" may be directly coupled or indirectly coupled through intermediaries. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.

In the description of the present invention, it should be understood that the directions or positional relationships indicated by the terms "upper", "lower", "left", "right", "front", "rear", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or units referred to must have a specific direction, be constructed and operated in a specific direction, and thus should not be construed as limiting the present invention.

In the description of the present specification, the terms "one embodiment," "some embodiments," "particular embodiments," and the like, mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An electric motor structure, comprising:

a housing in which a receiving chamber is formed;

the stator assembly is arranged in the accommodating cavity;

the rotor assembly is arranged in the accommodating cavity, the rotor assembly and the stator assembly are coaxially arranged, the rotor assembly is arranged on the radial outer side of the stator assembly, the rotor assembly comprises a fixing piece and a rotor shaft penetrating through a shaft hole of the fixing piece, and a permanent magnet is arranged in the fixing piece;

The fixing piece, the rotor shaft and the permanent magnet are integrally injection molded, a sliding bearing is arranged on the shell, and the rotor shaft is matched with the sliding bearing.

2. The motor structure according to claim 1, characterized in that the fixing member specifically includes:

a connecting end wall;

the rotor shaft hole pipe is arranged on the connecting end wall, and the shaft hole is formed in the rotor shaft hole pipe;

the matching side wall is connected with the connecting end wall and extends along the axial direction of the shaft hole by the connecting end wall, and an opening is formed at one end of the matching side wall far away from the connecting end wall.

3. The motor structure according to claim 1, characterized by further comprising:

the permanent magnet is in a halbach magnetic ring shape.

4. The motor structure according to claim 2, characterized by further comprising:

the reinforcing rib is arranged on one side of the connecting end wall, which is far away from the matched side wall;

one end of each reinforcing rib is connected with the rotor shaft hole pipe, and the other end of each reinforcing rib extends outwards along the radial direction of the shaft hole.

5. The motor structure as recited in claim 4, further comprising:

And the heat dissipation holes are formed in the connecting end wall, and at least one heat dissipation hole is formed between two adjacent reinforcing ribs.

6. The motor structure of claim 5, further comprising:

the boss is arranged on one side of the connecting end wall, close to the matched side wall, and is formed by extending the connecting end wall along the axial direction of the shaft hole;

wherein, the boss and the permanent magnet butt.

7. The motor structure according to claim 1, characterized by further comprising:

at least one clamping groove arranged on the rotor shaft;

knurling, which is arranged on the outer wall of the rotor shaft along the circumferential direction of the rotor shaft;

wherein, the draw-in groove extends along the axial or circumference of rotor shaft.

8. The motor structure according to claim 1, characterized in that the casing specifically comprises:

the first shell and the second shell are detachably connected, and the first shell and the second shell are connected to form a containing cavity;

the first shell and the second shell are respectively provided with the sliding bearing, and one end of the rotor shaft penetrates through the first shell to extend outwards.

9. The electric machine structure according to claim 8, characterized in that said stator assembly comprises in particular:

The fixing seat is provided with a stator shaft hole pipe, and the outer side wall of the stator shaft hole pipe is provided with a matching rib;

the stator iron core is sleeved outside the stator shaft hole pipe and comprises a plurality of stator teeth circumferentially arranged along the axis of the stator shaft hole pipe;

the stator winding is wound on the stator teeth;

wherein the fixing seat is made of plastic.

10. The motor structure according to claim 9, characterized by comprising:

and the insulating layer is arranged on the surface of the stator core, and the stator winding is wound on the insulating layer.

11. The motor structure according to claim 9, characterized by further comprising:

the circuit board is detachably connected with the fixing seat;

the clamping ribs are arranged on the fixing base and used for limiting the position of the circuit board relative to the fixing base.

12. The motor structure according to claim 11, wherein a first boss is arranged at one end of the fixing seat, a second boss is arranged on the first boss, the stator shaft hole is arranged at one end of the second boss, and the clamping rib is arranged on the second boss;

one end of circuit board is equipped with the cooperation fin, the cooperation fin stretches into the screens muscle with space between the first boss, motor structure still includes:

The first connecting hole is arranged on the circuit board;

the second connecting hole is arranged on the first boss corresponding to the first connecting hole;

wherein, the connecting piece passes first connecting hole with the second connecting hole is in order to realize the connection between circuit board and the first boss.

13. The motor structure according to claim 9, characterized by further comprising:

and the positioning ribs are arranged on the outer wall of the stator shaft hole pipe along the axial direction of the stator shaft hole pipe.

14. The motor structure of claim 13, further comprising:

the matching rib is arranged on the outer wall of the stator shaft hole pipe along the axial direction of the stator shaft hole pipe;

the height of the matching rib protruding out of the outer wall of the stator shaft hole pipe is smaller than that of the positioning rib protruding out of the outer wall of the stator shaft hole pipe.

15. The motor structure according to claim 9, characterized by further comprising:

and the positioning column is arranged at one end of the fixed seat, which is far away from the stator shaft hole pipe, and is used for being matched with the second shell.

16. The motor structure of claim 15, further comprising:

and the connecting hole is arranged on the end face of the second shell, and the positioning column is matched with the connecting hole.

17. The motor structure of claim 8, wherein a first bearing mounting opening is provided in the first housing, the sliding bearing being located in the first bearing mounting opening, the motor structure further comprising:

the first bearing gland is arranged on one side, close to the second shell, of the sliding bearing, and is matched with the first bearing mounting opening to form a first bearing chamber, and the sliding bearing is arranged in the first bearing chamber;

the first bearing elastic piece is arranged in the first bearing chamber, and the first bearing elastic piece is arranged on one side of the sliding bearing, which is close to the first bearing gland.

18. The motor structure of claim 8, wherein a second bearing mounting opening is provided in the second housing, the sliding bearing being located in the second bearing mounting opening, the motor structure further comprising:

the second bearing cover is arranged on one side, close to the first shell, of the sliding bearing and is matched with the second bearing mounting opening to form a second bearing chamber, and the sliding bearing is arranged in the second bearing chamber;

the second bearing elastic piece is arranged in the second bearing chamber, and the second bearing elastic piece is arranged on one side of the sliding bearing, which is close to the second bearing cover.

19. The motor structure of claim 8, further comprising:

the device comprises a first shell, a second shell, a matching groove and a matching protrusion, wherein one of the matching groove and the matching protrusion is arranged on the first shell, the other one of the matching groove and the matching protrusion is arranged on the second shell, and the first shell is connected with the second shell through matching of the matching groove and the matching protrusion.

20. The motor structure of claim 8, further comprising:

the tool positioning port is arranged on the end face periphery of the first shell and the second shell;

the tool positioning opening on the first shell is opposite to the tool positioning opening on the second shell.

21. A blower, comprising:

a housing;

a motor structure as claimed in any one of claims 1 to 20, provided within the housing.