CN216489944U - Stator and motor using same - Google Patents

Abstract

The utility model relates to a stator and use motor of this stator. The stator comprises a bracket and a stator core, wherein the stator core is provided with a first end surface and a second end surface which are opposite, the stator core is provided with an inner hole, the inner hole is arranged along the direction from the first end surface to the second end surface, and the bracket is installed in the inner hole along the direction from the first end surface to the second end surface; the inner diameter of the inner hole close to the first end face is larger than the inner diameter of the inner hole close to the second end face. The utility model discloses a stator core's hole utensil internal diameter not of uniform size, the internal diameter that the hole is facing assembly direction department is bigger, both makes things convenient for the assembly, makes the support mounting more fasten in stator core's hole again.

Description

Stator and motor using same

[ technical field ] A method for producing a semiconductor device

The utility model relates to the technical field of electric machines, more specifically relates to a stator and use motor of this stator.

[ background of the invention ]

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 includes a stator core and a winding wound to the stator core, etc., and the stator core is mounted to the bracket. How to ensure that the stator core can be stably installed on the bracket is a problem to be solved.

[ Utility model ] content

An object of the utility model is to make the stator core of motor can install the support steadily.

To this end, the first aspect of the present invention provides a stator, including a bracket and a stator core, wherein the stator core has a first end surface and a second end surface which are opposite to each other, the stator core has an inner hole, the inner hole is arranged along a direction from the first end surface to the second end surface, and the bracket is installed in the inner hole along a direction from the first end surface to the second end surface; the inner diameter of the inner hole close to the first end face is larger than the inner diameter of the inner hole close to the second end face.

In an embodiment of the present invention, the bracket is interference-fitted with the inner hole.

In an embodiment of the present invention, the inner hole is a through hole.

In an embodiment of the present invention, the stator core is formed by stacking a plurality of stator sheets having core holes, and the core holes form the inner holes after the plurality of stator sheets are stacked; the inner diameter of the iron core hole of the stator sheet close to the first end face is larger than that of the iron core hole of the stator sheet close to the second end face.

In an embodiment of the present invention, along the extending direction of the first end surface to the second end surface, the inner diameter of the inner hole is uniformly reduced, wavelike reduced, irregular-shaped reduced or stepped reduced.

In an embodiment of the present invention, one of the outer wall of the bracket and the inner wall of the inner hole is provided with a positioning protruding strip, the other one of the outer wall of the bracket and the inner wall of the inner hole is provided with a positioning groove, the positioning protruding strip and the positioning groove extend along the first end surface to the second end surface, and the positioning protruding strip and the positioning groove are combined to realize positioning.

In an embodiment of the present invention, the stator core is provided with a convex or concave mark position on the second end surface.

In one embodiment of the present invention, the marking position is a notch provided at the second end surface of the stator core near the inner hole; an end of the bracket passes over the second end face and fills the recess.

The second aspect of the present invention further provides a motor, which comprises a rotor and a stator provided by the first aspect of the present invention, wherein the rotor is rotatably mounted to the stator.

In an embodiment of the invention, the bracket is provided with a central hole extending in a direction from the first end face to the second end face; the rotor has a central shaft that is rotatably received in the central bore.

The utility model discloses an inner diameter that stator core's of motor hole utensil differs in size to, the inner diameter that the hole is facing assembly direction department is bigger, both makes things convenient for the assembly, makes the support can not shovel the material when stator core hole is advanced in the assembly just, makes the support after the assembly more fasten with the stator core cooperation.

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 according to an 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 ] embodiments

The invention is further described with reference to the following figures and examples.

The first embodiment is as follows:

referring to fig. 1, an embodiment of the present invention provides a motor 100 including a stator 20 and a rotor 70, the rotor 70 being 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 33, 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 OD1 of the inner bore 53 near the first end face 50a is greater than the inner diameter OD2 of the inner bore 53 near 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 wear and the scraping of the outer wall of the cylindrical body 32 at the position corresponding to the inner diameter OD1 is less, and the interference fit of the part of the outer wall of the cylindrical body 32 and the corresponding position of the inner hole 53 of the stator core 50, especially the interference fit at the position corresponding to the inner diameter OD2, can be ensured.

In this embodiment, the change from the inner diameter OD1 to the inner diameter OD2 is a step-like change, and the wall of the inner hole 53 forms a step. The utility model is not limited to the situation that 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 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 inside out, and a part of the end of the cylindrical body 32 is bonded to the mark 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 OD 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 only 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 those skilled in the art, without departing from the concept of the present invention, several variations and modifications can be made, such as combinations of different features in the various embodiments, which are within the scope of the present invention.

Claims (10)

1. A stator comprising a bracket and a stator core, the stator core having opposing first and second 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 bracket being mounted in the inner bore in the direction from the first end face to the second end face; the inner diameter of the inner hole close to the first end face is larger than the inner diameter of the inner hole close to the second end face.

2. The stator of claim 1, wherein the bracket has an interference fit with the bore.

3. The stator of claim 1, wherein the bore is a through bore.

4. The stator of claim 1, wherein said stator core is formed by stacking a plurality of stator sheets having core holes that form said inner bore after said plurality of stator sheets are stacked; the inner diameter of the iron core hole of the stator sheet close to the first end face is larger than that of the iron core hole of the stator sheet close to the second end face.

5. The stator of claim 1, wherein the inner diameter of the bore decreases uniformly, undulates, irregularly, or steps along the direction of extension of the first end face toward the second end face.

6. The stator of claim 1, wherein one of the outer wall of the bracket and the inner wall of the inner bore is provided with a positioning rib, the other of the outer wall of the bracket and the inner wall of the inner bore is provided with a positioning groove, the positioning rib and the positioning groove both extend along the first end surface to the second end surface, and the positioning rib and the positioning groove are combined to realize positioning.

7. The stator of claim 1 wherein said stator core is provided with raised or recessed indicia at said second end face.

8. The stator of claim 7, wherein the flag is a notch provided at the second end face of the stator core near the inner hole; an end of the bracket passes over the second end face and fills the recess.

9. An electrical machine comprising a rotor, and further comprising a stator according to any one of claims 1 to 8, the rotor being rotatably mounted to the stator.

10. The electric machine of claim 9, wherein the bracket is provided with a central bore extending in a direction from the first end face to the second end face; the rotor has a central shaft that is rotatably received in the central bore.

Images