CN216672685U - Stator and motor - Google Patents

Abstract

The utility model relates to a stator and a motor. This stator includes support and stator core, stator core has relative first terminal surface and second terminal surface, stator core has an hole, the hole is followed the direction setting of first terminal surface to second terminal surface, the hole is the through-hole, the support is followed the direction interference fit of first terminal surface to second terminal surface is installed in the hole, the first end of support is followed the direction of first terminal surface to second terminal surface surpasss the second terminal surface, first end has the portion of turning up, the portion of turning up is followed the support is outwards stretched out in order to cover at least a part of second terminal surface. The end part of the bracket is provided with the outward-turning part, and the bracket is tightly clamped to the second end surface by the outward-turning part after being arranged in the inner hole of the stator core in an interference fit manner, so that the bracket is arranged in the inner hole of the stator core and is more tightly fixed, and the stator core is prevented from falling off from the bracket.

Description

Stator and motor

[ technical field ] A method for producing a semiconductor device

The utility model relates to the technical field of motors, in particular to a stator and a motor.

[ background ] A method for producing a semiconductor device

The motor is used as the most common power source and is widely applied to various industries. An electric motor is generally composed of a stator and a rotor mounted to and rotating relative to the stator. For an outer rotor motor, the stator comprises a stator core, a winding wound on the stator core and the like, and the bracket is installed in an inner hole of the stator core. How to ensure that the bracket can be stably installed in an inner hole of the stator core and cannot be separated from each other is a problem to be solved.

[ Utility model ] content

The utility model aims to enable a bracket of a motor to be stably installed in an inner hole of a stator core.

To this end, in a first aspect of the present invention, there is provided a stator including a bracket and a stator core, the stator core having first and second opposite end faces, the stator core having an inner hole provided in a direction from the first end face to the second end face, the inner hole being a through hole, characterized in that the bracket is interference-fitted into the inner hole in the direction from the first end face to the second end face, a first end of the bracket exceeds the second end face in the direction from the first end face to the second end face, the first end is formed with an inside-out portion, and the inside-out portion protrudes outward from the bracket to cover at least a part of the second end face.

In one embodiment of the utility model, the bracket is a one-piece unitary body formed of a high temperature heat fusible material.

In one embodiment of the utility model, the eversion is formed by heating the first end and then pressing it outwardly.

In one embodiment of the present invention, the first end protrudes from the second end face and the protruding height is less than or equal to 3 mm.

In one embodiment of the utility model, the inner diameter of the bore is greater proximate the first end face than proximate the second end face.

In one embodiment of the present invention, the second end surface of the stator core is provided with a melt groove, and the outward-turned portion is filled in the melt groove.

In one embodiment of the utility model, the bracket has a cylindrical main body, and the outer wall of the cylindrical main body is provided with a raised positioning step, and the positioning step and the outward turning part clamp the first end face and the second end face of the stator core respectively.

In one embodiment of the utility model, the melting trough is communicated with the inner hole into a whole.

In one embodiment of the utility model, the melt channel is composed of at least two notches arranged on the second end surface and arrayed along the circumferential direction of the inner hole.

In one embodiment of the present invention, the notch serves as a marking place for marking which end face of the stator core belongs to the second end face.

In a second aspect of the present invention, there is also provided a motor comprising a rotor having a central shaft, and further comprising the stator of the first aspect of the present invention, wherein the central shaft is fitted into the bracket in a direction from the second end surface to the first end surface, so that the rotor is rotatably mounted to the stator.

The end part of the bracket of the motor is provided with the outward turning part, and the bracket is tightly clamped to the second end surface by the outward turning part after being arranged in the inner hole of the stator core in an interference fit manner, so that the assembled bracket is matched with the stator core more firmly, and the stator core is prevented from falling off from the bracket.

On the other hand, after the support and the stator core are assembled and fastened, the rotor is assembled to the support, so that the rotor, the support and the stator core are not matched loosely and cannot be separated from each other, and a motor which is assembled stably is formed.

[ description of the drawings ]

FIG. 1 is a schematic view of an electric machine provided by one embodiment of the present invention;

FIG. 2 is a schematic view of a rotor for use with the motor shown in FIG. 1;

FIG. 3 is an exploded view of a stator for use with the illustrated motor;

fig. 4 is a cross-sectional view of a stator core used in the stator shown in fig. 3;

fig. 5 is a longitudinal sectional view of the stator core shown in fig. 4;

fig. 6 is a longitudinal sectional view of a stator core according to another embodiment of the present invention.

[ detailed description ] A

The utility model is further described below with reference to the figures and examples.

The first embodiment is as follows:

referring to fig. 1, a motor 100 according to an embodiment of the present invention includes a stator 20 and a rotor 70, and the rotor 70 is rotatably mounted to the stator 20. The stator 20 includes a bracket 30, a control circuit board 40 fixedly mounted to the bracket 30, a stator core and its windings (not shown in fig. 1), and the like. The control circuit board 40 is connected to an external power source and/or controller via a cable 42.

Referring to fig. 1 and 2, in the present embodiment, the motor 100 is an outer rotor motor, and the rotor 70 includes a cylindrical housing 72, a permanent magnet 74 mounted to an inner wall of the housing 72, a center shaft 76 fixed to a bottom center of the housing 72, and the like. The central shaft 76 is rotatably mounted to the stator 20 such that the rotor 70 and the central shaft 76 as a unit can rotate relative to the stator 20. Most of the structure of the stator 20 is housed within the housing 72 of the rotor 70.

Referring to fig. 3, the stator 20 includes a bracket 30 and a stator core 50. The bracket 30 has a cylindrical main body 32 and a connecting portion 38 connected to the cylindrical main body 32, the connecting portion 38 being used to connect the stator 20 to the outside. The stator core 50 is fixedly fitted to the cylindrical body 32. The stator core 50 includes an annular yoke 52 and a plurality of stator teeth 57 extending outwardly from the yoke 52, with slots formed between adjacent stator teeth 57 for receiving stator windings (not shown in fig. 3). The stator core 50 has a first end face 50a and a second end face 50b opposite to each other, and the first end face 50a and the second end face 50b are respectively located at both axial ends of the stator core 50. The stator core 50 has an inner hole 53 in a middle portion thereof, the inner hole 53 being disposed in a direction from the first end surface 50a to the second end surface 50b, and the bracket 30 being fitted into the inner hole 53 in the direction from the first end surface 50a to the second end surface 50b, thereby fixedly coupling the stator core 50 and the bracket 30 together. Preferably, the outer wall of the cylindrical body 32 is provided with a raised positioning step 33, and the first end surface 50a of the stator core 50 is abutted by the positioning step 33 when assembled, thereby defining the assembly position of the stator core 50.

Referring to fig. 2 and 3, the cylindrical body 32 of the holder 30 is provided with an axial center hole 36, and a center shaft 76 of the rotor 70 is rotatably fitted into the center hole 36 in a direction from the second end face 50b to the first end face 50 a. For example, a bearing is mounted to the central bore 36, and the central shaft 76 is rotatably supported by the bearing, so that the rotor 70 and the central shaft 76 as a whole can rotate relative to the bracket 30.

In this embodiment, the inner hole 53 is a through hole, and the cylindrical body 32 of the bracket 30 is in interference fit with the inner hole 53. The cylindrical body 32 of the bracket 30 is preferably a molded plastic part.

Referring to fig. 3-5, in the present embodiment, the inner diameter ID1 of the inner bore 53 proximate the first end face 50a is greater than the inner diameter ID2 of the inner bore 53 proximate the second end face 50 b. One advantage of this design is ease of assembly. Another advantage is that during the interference fit of the bracket 30 into the inner hole 53, when the bracket 30 enters the inner hole from the first end surface 50a, the abrasion and shoveling of the outer wall of the tubular main body 32 at the position corresponding to the inner diameter ID1 is less, and the interference fit of the part of the outer wall of the tubular main body 32 and the corresponding position of the inner hole 53 of the stator core 50, especially the interference fit of the position corresponding to the inner diameter ID2, can be ensured.

In this embodiment, the change from ID1 to ID2 is a step-like change, and the wall of the bore 53 forms a step. The present invention is not limited to the case where only one step is formed; it will be appreciated that the wall of the bore 53 may be formed with a plurality of steps such that the inner diameter of the bore 53 decreases stepwise a plurality of times in a direction from the first end face 50a to the second end face 50 b.

The stator core 50 is provided with a convex or concave mark position 55 at the second end face 50 b. The marking position 55 has a visual distinguishing effect, so that the assembly direction can be conveniently identified during assembly, and which end face of the stator core 50 belongs to the second end face 50b is marked, so that the assembly efficiency and the accuracy are improved. Further, in the actual production assembly, the end of the cylindrical body 32 slightly protrudes from the second end face 50b of the stator core 50, the end of the cylindrical body 32 is heated and turned outward, and a part of the end of the cylindrical body 32 is combined with the mark site 55. Preferably, the mark 55 is a notch, and the end of the cylindrical body 32 is filled into the mark 55, which is a notch, so that the connection of the bracket 30 and the inner hole 53 is more secure.

In this embodiment, the outer wall of the cylindrical main body 32 of the bracket 30 is provided with a positioning convex strip 34, the inner wall of the inner hole 53 of the stator core 50 is provided with a positioning groove 54, the positioning convex strip 34 and the positioning groove 54 both extend along the first end surface 50a to the second end surface 50b, and the positioning convex strip 34 and the positioning groove 54 are combined to realize positioning during assembly. It is to be understood that the positioning ribs 34 may be provided on the inner wall of the inner hole 53 of the stator core 50, and the positioning grooves 54 may be provided on the outer wall of the cylindrical body 32 of the bracket 30.

In this embodiment, the stator core 50 is formed by stacking a plurality of stator sheets having core holes, and the core holes form the inner holes 53 after the stacking of the plurality of stator sheets. The inner diameter of the core hole of the stator plate near the first end face 50a is larger than the inner diameter of the core hole of the stator plate near the second end face 50 b. Understandably, one or more stator plates may be used to form inner bore 53 of inner diameter ID 1.

In this embodiment, the bracket 30 is a one-piece unitary body of high temperature heat fusible material. The connecting portion 38 of the holder 30 has a plate shape, and the plane of the connecting portion 38 is substantially perpendicular to the axial direction of the cylindrical body 32. The first end 35 of the cylindrical body 32 exceeds the second end face 50b in a direction from the first end face 50a to the second end face 50b of the stator core 50, the first end 35 is formed with an inside-out portion 37, and the inside-out portion 37 projects outward from the cylindrical body 32 to cover at least a part of the second end face 50 b. The eversion 37 is formed by the first end 36 being heated and then pressed outwardly. After assembly, the positioning step 33 and the outward turned part 37 of the bracket 30 clamp the first end surface 50a and the second end surface 50b of the stator core 50, respectively, to prevent the stator core 50 from falling off.

Preferably, the first end 35 protrudes from the second end face 50b by a height of less than or equal to 3 mm to avoid interference with other components. The mark 55 is a notch, forming a melt channel. The turned-up portion 37 is filled in the melt channel. The melt channel is formed by at least two notches disposed in the second end surface 50b in an array circumferentially about the inner bore 36.

Example two:

referring to fig. 6, the main difference between this embodiment and the embodiment shown in fig. 5 is that the inner diameter of the inner bore 53 is uniformly changed, i.e., the inner diameter of the inner bore 53 is uniformly reduced along the direction from the first end surface 50a to the second end surface 50 b.

It will be appreciated that the inner diameter of the bore 53 may also have other variations, such as a wavy reduction, an irregularly shaped reduction, etc.

The above examples merely represent preferred embodiments of the present invention, which are described in more detail and detail, but are not to be construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications, such as combinations of different features in various embodiments, may be made without departing from the spirit of the utility model, and these are within the scope of the utility model.

Claims (10)

1. A stator comprising a bracket and a stator core, the stator core having first and second opposite end faces, the stator core having an inner bore, the inner bore being disposed in a direction from the first end face to the second end face, the inner bore being a through-hole, characterized in that the bracket is interference-fitted into the inner bore in a direction from the first end face to the second end face, the first end of the bracket exceeds the second end face in a direction from the first end face to the second end face, the first end being formed with an inside-out portion, the inside-out portion projecting outwardly from the bracket to cover at least a portion of the second end face.

2. The stator of claim 1 wherein said support is a one-piece unitary body formed of a high temperature heat fusible material.

3. The stator of claim 1 wherein said evagination is formed by heating and then pressing said first end outwardly.

4. The stator of claim 1, wherein the first end protrudes beyond the second end face by a height of less than or equal to 3 mm.

5. The stator of claim 1, wherein an inner diameter of the bore proximate the first end face is greater than an inner diameter of the bore proximate the second end face.

6. The stator of claim 1 wherein the second end surface of the stator core is provided with a melt channel, the outer turn-up being filled in the melt channel.

7. The stator according to claim 1, wherein the bracket has a cylindrical body, an outer wall of which is provided with a raised positioning step, and the positioning step and the inside-out portion clamp the first end face and the second end face of the stator core, respectively.

8. The stator of claim 6, wherein the melt channel is formed by an array of at least two notches in the second end surface along a circumferential direction of the inner bore.

9. The stator according to claim 8, wherein the notch serves as a mark bit for marking which end face of the stator core belongs to the second end face.

10. An electrical machine comprising a rotor having a central shaft, and further comprising a stator according to any one of claims 1 to 9, said central shaft being received in said housing in a direction from said second end face to said first end face such that said rotor is rotatably mounted to said stator.

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