CN105846564B

CN105846564B - Motor and stator structure thereof

Info

Publication number: CN105846564B
Application number: CN201510738046.8A
Authority: CN
Inventors: 李越; 姜茂雄; 赵健; 王勇; 李勇; 廖燕飞
Original assignee: Johnson Electric SA
Current assignee: Johnson Electric SA
Priority date: 2015-01-30
Filing date: 2015-11-03
Publication date: 2020-04-21
Anticipated expiration: 2035-11-03
Also published as: CN105846565A; BR102016001939A2; MX367223B; MX2016001430A; BR102016001941A2; CN105846559A; MX2016001429A; KR20160094328A; JP2016158484A; CN105846564A; KR20160094329A

Abstract

The utility model provides a motor stator structure, includes magnetic core, cladding bobbin on the magnetic core and around locating the coil on the magnetic core, the magnetic core include annular yoke and by a plurality of teeth of radial outside extension of yoke, the coil is around locating the tooth of magnetic core, the bobbin is post forming's an organic whole structure, including the cladding the insulating part of magnetic core, be located supporting part in the magnetic core and a plurality of fins of a body coupling between insulating part and supporting part, the fin sets up along circumference interval, the integrative beaded finish that inlays in the insulating part, the intensity of beaded finish is higher than the insulating part, so not only effectively promote the material utilization ratio, can also effectively alleviate stator structure's weight under the condition of assurance intensity.

Description

Motor and stator structure thereof

Technical Field

The present invention relates to an electric motor, and more particularly, to a stator structure of an electric motor.

Background

The motor is used as a power source and is commonly used in daily production and life, such as an electric fan, a washing machine, a water pump and the like. Generally, an electric machine is composed of two parts, a rotor and a stator. The stator is composed of a magnetic core and a coil wound on the magnetic core, the rotor is provided with a permanent magnet, and the coil of the stator generates a changing magnetic field when being electrified and acts with the magnetic field of the rotor to push the rotor to rotate so as to drive the load.

The magnetic core of the existing stator is generally formed by stacking a plurality of silicon steel sheets, each of which is directly punched from a sheet-like raw material, and includes an annular yoke portion, a tooth portion radiating outward from the yoke portion, and a support portion formed in the yoke portion for fixedly connecting the stator to other components, the tooth portion being wound with a coil and reinforcing a magnetic field of the coil. Although the existing magnetic core of the stator is simpler in manufacturing process, a large amount of waste materials are formed in punching manufacturing, and raw materials are wasted. In addition, the silicon steel sheet forms a supporting part, although the strength of the supporting part can be ensured, the weight of the magnetic core and the stator structure formed by the magnetic core is increased to a certain extent.

Disclosure of Invention

In view of this, a motor stator structure with high material utilization rate and light weight is provided.

The utility model provides a motor stator structure, including magnetic core, cladding bobbin on the magnetic core and around locating the coil on the magnetic core, the magnetic core includes annular yoke and by a plurality of teeth of radial outside extension of yoke, the coil is around locating on the tooth of magnetic core, the bobbin is post forming's an organic whole structure, including the cladding the insulating part of magnetic core, be located supporting part in the magnetic core and a plurality of fins of a body coupling between insulating part and supporting part, the fin sets up along circumference interval, the integrative beaded finish that inlays in the insulating part, the intensity of beaded finish is higher than the insulating part.

Compared with the prior art, the winding frame of the motor stator structure integrally forms the supporting part in the magnetic core and the reinforcing ring is embedded in the supporting part, so that the material utilization rate is effectively improved, and the weight of the stator structure can be effectively reduced under the condition of ensuring the strength.

Drawings

The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

Fig. 1 is a schematic view of a stator structure of an electric motor according to an embodiment of the present invention.

Fig. 2 is a cross-sectional view of the stator structure shown in fig. 1.

Fig. 3 is an exploded view of the stator structure shown in fig. 1.

Fig. 4 is a schematic cross-sectional view of a motor according to an embodiment of the present invention.

Fig. 5 is a perspective view of the supporting base of the motor of the present invention.

Fig. 6 is a schematic view of another embodiment of the stator structure of the motor of the present invention.

Fig. 7 is a cross-sectional view of the stator structure shown in fig. 6.

Fig. 8 is an exploded view of the stator structure shown in fig. 4.

Fig. 9 is a schematic cross-sectional view of a motor according to another embodiment of the present invention.

Detailed Description

Fig. 1 to 3 show an embodiment of a stator structure of an electric machine according to the present invention, which includes a magnetic core 10 made of soft magnetic material having magnetic permeability, a reinforcing member such as a reinforcing ring 20 disposed in the magnetic core 10, a bobbin 30 integrally connecting the magnetic core 10 and the reinforcing ring 20, and a coil 31 wound on the bobbin 30 (see fig. 4).

In this embodiment, the magnetic core 10 is an integral structure formed by spirally winding a strip material, and includes an annular yoke 12 and a plurality of teeth 14 extending radially outward from an outer edge of the yoke 12. The yoke 12 is a hollow cylindrical structure formed by a spiral, and the teeth 14 are uniformly or non-uniformly spaced along the circumference of the yoke 12. Compared with the traditional round punching sheet structure, the magnetic core 10 formed by spiral lap winding basically has no waste, and the utilization rate of raw materials is effectively improved. In some embodiments, the strips may be bent to form discs, which are then stacked to form the magnetic core 10, again substantially free of scrap material. In this embodiment, the yoke 12 of the magnetic core 10 is formed with a plurality of through holes, the through holes axially penetrate through the yoke 12, and fixing members such as pins 40 are inserted into the through holes to shape the magnetic core 10. In some embodiments, the core 10 may be shaped by other means, such as welding the stacked teeth 14 together.

Each tooth 14 includes a winding portion 16 connected to the yoke 12 and a wing portion 18 formed at an end of the winding portion 16. A winding slot is formed between two adjacent winding portions 16, a notch is formed between two adjacent wing portions 18, and the coil is wound on the winding portions 16 and positioned in the winding slot. Preferably, a slot 17 is formed at the connection of the wing part 18 and the winding part 16. Before molding, the wing parts 18 are partially turned outwards, the adjacent wing parts 18 can be partially overlapped in the length direction of the belt material, and the width of the wing parts 18 is effectively increased. After the strip is helically formed, the wing portions 18 are spread apart, and a large tooth space is formed between adjacent wing portions 18 to facilitate winding. After winding, the raised wing parts 18 are pressed to generate plastic deformation and bend inwards to be tightly abutted with the winding parts 16, so that the original cutting grooves 17 are narrowed into a straight line shape, and a small notch is formed between the adjacent wing parts 18. In the present embodiment, the notch 17 is formed only at the joint between one side of the winding portion and the wing portion, but in other embodiments, the notch 17 may be formed at the joint between both sides of the winding portion and the wing portion 18.

The reinforcement ring 20 is disposed coaxially with the magnetic core 10 and within the yoke 12 of the magnetic core 10, and includes an annular body 22 and a plurality of legs 24 extending from the body 22. The outer diameter of the body 22 is much smaller than the inner diameter of the yoke 12 and the legs 24 extend axially downward from the outer edge of the body 22. In this embodiment, the legs 24 are provided in plural numbers, and are uniformly spaced along the circumference of the body 22 (in other embodiments, they may be non-uniformly spaced), and the end of each leg 24 forms a barb. The inner edge of the body 22 projects radially inwardly to form a projection 26 for assembly positioning of the stator structure.

The bobbin 30 has an integral structure formed by over molding (over molding) an insulating material such as plastic, and the core 10 and the reinforcing ring 20 are placed in a mold during molding, and the core 10 and the reinforcing ring 20 are covered and integrally connected when the bobbin 30 is formed by cooling the plastic. The bobbin 30 includes an insulating portion 32 corresponding to the magnetic core 10, a supporting portion 34 corresponding to the reinforcing ring 20, and a plurality of tabs 36 connected between the insulating portion 32 and the supporting portion 34.

The insulating portion 32 matches the shape of the magnetic core 10, as shown in fig. 1 and 2, the insulating portion 32 covers all outer surfaces of the magnetic core 10 except the outer circumferential surface 19 of the wing portion 18, so that insulation between the coil and the magnetic core 10 when the coil is wound on the magnetic core 10 subsequently is ensured, and short circuit of the coil is avoided. The support portion 34 is cylindrical, covers the reinforcing ring 20, and forms a support mechanism together with the reinforcing ring 20, so as to connect and fix the stator structure and other elements of the motor. In the present embodiment, the inner diameter of the supporting portion 34 is smaller than the outer diameter of the reinforcing ring 20, the inner wall surface of the supporting portion 34 is formed with a rim 38 protruding inward in the radial direction, and the body 22 of the reinforcing ring 20 is overlapped on the rim 38, and the inner diameters of the two are equivalent. The outer edge of the body 22 of the reinforcement ring 20 and the legs 24 are embedded in the insulation 32. The fins 36 are circumferentially spaced, and each fin 36 is in a thin sheet shape and is connected between the outer wall of the supporting portion 34 and the inner wall of the insulating portion 32, so that the connection strength between the insulating portion 32 and the supporting portion 34 is ensured, and the overall weight of the bobbin 30 is reduced.

Fig. 4 is a schematic cross-sectional view of a motor assembled from a stator structure and a rotor structure according to the present invention. Fig. 5 is a perspective view of the supporting base of the motor of the present invention.

Referring to fig. 4 and 5, the motor further includes a rotor structure 60 and a support 80, the rotor structure 60 includes a rotating shaft 62, a housing 64 fixed to the rotating shaft 62, and a permanent magnet 66 mounted on an inner surface of a side wall of the housing 64, the permanent magnet 66 being opposite to an outer surface of the teeth 14 of the stator core 10 and forming an air gap therebetween. The support seat 80 has a hollow sleeve 82 formed at the center thereof to protrude upward in the axial direction for supporting a bearing or the like to support the rotation of the rotor. The sleeve 82 is recessed on the outer wall surface of its top end to form a recess 84 for circumferential co-location with the stator structure. The shaft 62 is mounted in a sleeve 82 of the support 80 by means of a bearing 68. By aligning the protrusions 26 on the reinforcement ring 20 of the stator structure with the recesses 84 on the support seat 80 to position the stator structure circumferentially relative to the support seat 80, it will be appreciated that the positions of the positioning protrusions and recesses may be interchanged. In this embodiment, the support seat 80 is made of a metal material such as aluminum, and after the stator structure is mounted to the sleeve 82, the free end 86 of the sleeve 82 can be sealed by a tool with an arc-shaped machined surface, so that the free end of the sleeve is plastically deformed outward to realize the rivet connection with the reinforcing ring 20 of the stator structure (the outer surface of the free end 86 of the sleeve 82 is pressed from outside to inside against the reinforcing ring 20 to prevent the reinforcing ring 20 from being withdrawn from the free end 86 of the sleeve 82).

Because the stator structure forms the magnetic core 10 by bending/winding the strip material, the utilization rate of raw materials can be effectively improved, the cogging torque can be reduced, and the running stability of the motor can be improved. In addition, the bobbin 30 is formed integrally by secondary molding, and the bobbin 30 integrally forms the supporting portion 34 in the inner portion of the magnetic core 10, compared with the supporting portion formed by extending the magnetic core 10 inwards, the material can be saved effectively, the whole weight of the stator structure can be reduced effectively, and the product is light in weight. In addition, a reinforcing ring 20 is provided within the support portion 34 so that the support mechanism has sufficient strength so as not to be easily deformed or damaged when subjected to a force.

Fig. 6-9 show another embodiment of the stator structure of the present invention, which differs mainly in the bobbin 30 and the reinforcing ring 20. In this embodiment, the bobbin 30 includes an upper bobbin 30a and a lower bobbin 30b, and the upper bobbin 30a and the lower bobbin 30b are respectively integrally formed by injection molding and the like, and then assembled to form the bobbin 30. The reinforcing ring 20 is embedded in the supporting portion 34a/34b of one of the upper and lower bobbins 30a and 30b to reinforce the strength of the supporting portion 34 of the bobbin 30. In this embodiment, the reinforcing ring 20 is embedded in the upper bobbin 30a, and its outer edge is corrugated. It can be understood that the support mechanism is formed by the reinforcement ring 20 and the plastic bobbin 30, the overall weight is reduced while the strength of the support mechanism is ensured by using the characteristics of high metal strength and light weight of plastic, and the shape of the reinforcement ring 20 can be changed as required without being limited by the specific embodiment of the invention and the attached drawings.

The inner wall of the support portion 34a of the upper bobbin 30a protrudes inward to form a rim 38a, the reinforcement ring 20 overlaps the rim 38a and is partially exposed, and the outer edge thereof extends into the support portion 34a and is covered by the upper bobbin 30 a. Preferably, the rim 38a of the upper bobbin 30a is formed with a plurality of through holes 39a, and the through holes 39a are uniformly spaced along the circumferential direction and axially penetrate through the rim 38 a. The inner wall of the support portion 34b of the lower bobbin 30b protrudes inward to form an annular rim 38b, a plurality of convex columns 39b are formed on the annular rim 38b, and the convex columns 39b are respectively inserted into a through hole 39a to connect the lower bobbin 30b and the upper bobbin 30a into a whole. In other embodiments, the convex pillar 39b may be formed on the upper bobbin 30a, the through hole 39a is formed on the lower bobbin 30b, the upper and lower bobbins 30a, 30b are connected to form the bobbin 30 by the matching of the convex pillar 39b and the through hole 39a, and the supporting portions 34a, 34b together form the plastic supporting portion 34 in the magnetic core 10, and cooperate with the reinforcing ring 20 to ensure the strength of the stator structure and make it light.

It should be noted that the present invention is not limited to the above-mentioned embodiments, and other changes and modifications can be made by those skilled in the art according to the spirit of the present invention, and these changes and modifications made according to the spirit of the present invention should be included in the scope of the present invention as claimed.

Claims

1. The utility model provides a motor stator structure, includes the magnetic core, wraps the bobbin on the magnetic core and around locating the coil on the magnetic core, the magnetic core includes annular yoke and by a plurality of teeth of yoke along radial outside extension, the coil is around locating on the tooth of magnetic core, its characterized in that: the bobbin is of an integrally-formed structure, the bobbin comprises an insulating part covering the magnetic core, a supporting part located in the magnetic core and a plurality of fins integrally connected between the insulating part and the supporting part, the fins are arranged at intervals along the circumferential direction, reinforcing parts are integrally embedded in the insulating part, the strength of the reinforcing parts is higher than that of the insulating part, the supporting part is cylindrical, the inner wall of the supporting part protrudes inwards to form a ring edge, the reinforcing parts are stacked on the ring edge, and the outer edge of the reinforcing parts is embedded in the supporting part.

2. The stator structure of an electric machine according to claim 1, wherein the reinforcing member is a metal ring or a metal plate.

3. The stator structure of an electric motor according to claim 2, wherein the inner edge of the reinforcing member is formed with positioning projections and/or depressions.

4. The electric machine stator structure of claim 1, wherein the reinforcement member comprises an annular body and a plurality of legs extending axially outwardly from an outer edge of the body, the legs terminating in barbs.

5. The stator structure of an electric motor according to claim 1, wherein an outer edge of the reinforcing member is corrugated.

6. The stator structure of motor according to claim 1, wherein the bobbin comprises an upper bobbin and a lower bobbin, one of the upper bobbin and the lower bobbin is formed with a through hole, and the other is formed with a protrusion, and the protrusion is inserted into the through hole to connect the upper bobbin and the lower bobbin.

7. The stator structure of motor according to claim 1, wherein each of the plurality of teeth includes a winding portion connected to the yoke and a wing portion formed at an end of the winding portion, the coil is wound on the winding portion, a notch is formed at a connection of the wing portion and the winding portion, a front portion of the wing portion is formed to be tilted outward, and the notch is narrowed to a linear shape by being deformed inward by a force after the winding is completed to contact the winding portion.

8. The stator structure of an electric motor according to claim 1, wherein the magnetic core is formed by bending a material strip, and a through hole is formed in a yoke of the magnetic core, and a pin is inserted into the through hole to shape the magnetic core.

9. The stator structure of an electric motor according to claim 1, wherein the magnetic core is formed by bending a material tape, and teeth of the magnetic core are integrally connected by welding.

10. The utility model provides a motor, includes supporting seat, stator structure and rotor structure, the supporting seat is formed with the rotation of cavity sleeve in order to support rotor structure, its characterized in that: the stator structure as claimed in any one of claims 1 to 9, wherein the stator structure includes a connecting portion, and the connecting portion is sleeved on the sleeve of the supporting seat.

11. The motor of claim 10, wherein one of an inner wall surface of the cylinder of the bobbin and an outer wall surface of the sleeve of the support base is formed with a projection, and the other is formed with a recess that fits the projection for positioning the stator structure in a circumferential direction.

12. An electrical machine according to claim 10, wherein a riveted connection is provided between the free end of the sleeve and the reinforcement.