KR102013852B1

KR102013852B1 - Motor

Info

Publication number: KR102013852B1
Application number: KR1020120147318A
Authority: KR
Inventors: 서자영
Original assignee: 엘지이노텍 주식회사
Priority date: 2012-12-17
Filing date: 2012-12-17
Publication date: 2019-08-23
Also published as: KR20140078795A

Abstract

The motor is started. The motor is mold-molded to surround the outer surface of the rotor, and includes a mold portion including at least one protrusion protrudingly formed on an upper surface thereof, and combining the protrusions formed in the mold portion with holes formed in a sensing plate and performing a heat fusion process. The head of the protrusion is deformed and adhered to the sensing plate to fix the sensing plate to the shaft.

Description

Motor {MOTOR}

The present invention relates to a motor, and more particularly, to a structure for assembling a sensing plate of a motor.

A motor is a device that generates rotational force by electromagnetic interaction. Motors are widely used throughout the industry.

The motor may include, for example, a shaft, a rotor, a stator, a housing, a sensing plate, and a sensing magnet. The rotor is assembled to enclose the shaft. The stator is spaced a certain distance from the rotor and is fixed to the housing. The shaft rotates with the rotor using the interaction by the magnetic fields generated by the rotor and the stator. The sensing magnet is coupled to the sensing plate, and the sensing plate to which the sensing magnet is coupled is fixed to the shaft.

When the sensing plate is coupled to the shaft of the motor by a press-fit method, it is necessary to manage the press-in depth, and there is a problem that a shake occurs in the sensing magnet due to the press-fit of the sensing plate, thereby causing a defect.

An object of the present invention is to provide a structure for assembling the sensing plate of the motor.

Motor according to an embodiment of the present invention, the shaft, the shaft is fixed to the central portion, the rotor including a rotor core and magnet, the mold is formed to surround the outer surface of the rotor, at least one protrusion protruded on the upper surface And a sensing plate coupled to an upper surface of the mold unit, a sensing plate including at least one hole in which the at least one protrusion is assembled, and a sensing magnet magnetized to an upper surface of the sensing plate.

Motor according to another embodiment of the present invention, the shaft, the shaft is fixed to the central portion, a rotor comprising a rotor core and a magnet, molded to surround the outer surface of the rotor, at least one protrusion protruded to the upper surface A sensing plate including a mold part coupled to an upper surface of the mold part, the sensing plate including at least one first hole to which the at least one protrusion is assembled, and assembled to an upper surface of the sensing plate, At least one second hole in which the protrusion is assembled includes a sensing magnet formed in the dummy magnet.

According to an embodiment of the present invention, the sensing plate may be fixed to the shaft without the indentation process. Accordingly, there is no need for the press-fitting process equipment, thereby reducing the equipment. In addition, it is possible to prevent shaking of the sensing magnet by indentation and to maintain the magnetization angle of the sensing magnet at a constant level, thereby improving the hall signal, thereby reducing signal defects.

1 is an example of fixing the sensing plate to the shaft.
2 is a side cross-sectional view illustrating an assembly structure in which a sensing plate of a motor is assembled to a shaft according to a first embodiment of the present invention.
3 is a perspective view illustrating a sensing plate according to a first embodiment of the present invention.
4 is a perspective view illustrating a sensing magnet according to a first embodiment of the present invention.
5 is a perspective view illustrating a mold unit according to a first embodiment of the present invention.
6 is a view illustrating an assembly structure of a mold unit and a sensing plate according to the first embodiment of the present invention.
7 is a side cross-sectional view illustrating an assembly structure in which a sensing plate of a motor according to a second embodiment of the present invention is assembled to a shaft.
8 is a perspective view illustrating a sensing plate according to a second embodiment of the present invention.
9 is a perspective view illustrating a sensing magnet according to a second embodiment of the present invention.
10 is a perspective view illustrating a mold unit according to a second exemplary embodiment of the present invention.
11 is a view illustrating an assembly structure of a mold part and a sensing plate according to a second embodiment of the present invention.
12 is a side cross-sectional view illustrating an assembly structure in which a sensing plate of a motor according to a third embodiment of the present invention is assembled to a shaft.
13 is a perspective view illustrating a mold unit according to a third exemplary embodiment of the present invention.

As the invention allows for various changes and numerous embodiments, particular embodiments will be illustrated and described in the drawings. However, this is not intended to limit the present invention to specific embodiments, it should be understood to include all modifications, equivalents, and substitutes included in the spirit and scope of the present invention.

Terms including ordinal numbers, such as second and first, may be used to describe various components, but the components are not limited by the terms. The terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the second component may be referred to as the first component, and similarly, the first component may also be referred to as the second component. The term and / or includes a combination of a plurality of related items or any item of a plurality of related items.

When a component is referred to as being "connected" or "connected" to another component, it may be directly connected to or connected to that other component, but it may be understood that other components may be present in between. Should be. On the other hand, when a component is said to be "directly connected" or "directly connected" to another component, it should be understood that there is no other component in between.

The terminology used herein is for the purpose of describing particular example embodiments only and is not intended to be limiting of the present invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. In this application, the terms "comprise" or "have" are intended to indicate that there is a feature, number, step, operation, component, part, or combination thereof described in the specification, and one or more other features. It is to be understood that the present invention does not exclude the possibility of the presence or the addition of numbers, steps, operations, components, components, or a combination thereof.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art. Terms such as those defined in the commonly used dictionaries should be construed as having meanings consistent with the meanings in the context of the related art and shall not be construed in ideal or excessively formal meanings unless expressly defined in this application. Do not.

DETAILED DESCRIPTION Hereinafter, exemplary embodiments will be described in detail with reference to the accompanying drawings, and the same or corresponding components will be given the same reference numerals regardless of the reference numerals, and redundant description thereof will be omitted.

1 is an example of fixing the sensing plate to the shaft.

1, a cylindrical rotor 2 is fixed to the shaft 1 of the motor to surround the shaft 1. On the outer surface of the rotor 2 is formed a mold portion 3 surrounding the outer surface of the rotor 2.

In addition, the sensing plate 4 to which the sensing magnet 5 is coupled is fixed to the shaft 1 of the motor. The sensing plate 4 may be fixed to the shaft 1 of the motor in a press-fit manner.

On the other hand, when the sensing plate is coupled to the shaft of the motor by a press-fit method, it is necessary to manage the indentation depth, there is a problem that a failure occurs due to the shaking occurs in the sensing magnet due to the press-fit of the sensing plate.

According to an embodiment of the present invention, in order to prevent the occurrence of defects due to the press-fit process of the sensing plate, a protrusion is formed on the upper surface of the mold portion surrounding the rotor, and the protrusion is coupled to a hole formed in the sensing plate or the sensing magnet Secure the sensing plate to the shaft.

Hereinafter, a motor according to a first embodiment of the present invention will be described in detail with reference to FIGS. 2 to 6.

2 is a side cross-sectional view illustrating an assembly structure in which a sensing plate of a motor is assembled to a shaft according to a first embodiment of the present invention. 3 is a perspective view illustrating a sensing plate according to a first embodiment of the present invention, and FIG. 4 is a perspective view illustrating a sensing magnet according to a first embodiment of the present invention. 5 is a perspective view illustrating a mold part according to a first embodiment of the present invention, and FIG. 6 is a view illustrating an assembly structure of a mold part and a sensing plate according to the first embodiment of the present invention.

2 to 6, the motor contacts the shaft 10, the rotor 20 surrounding the shaft, the mold part 30 packaged to surround the outer surface of the rotor 20, and the upper end of the mold part 30. And a sensing magnet 50 assembled to contact the upper end of the sensing plate 40 and the sensing plate 40.

The rotor 20 includes a rotor core and at least one rotor magnet coupled to the rotor core. The through hole is formed in the center of the rotor 20 in the longitudinal direction. The shaft 10 is inserted into the through hole, so that the rotor 20 is fixed to the shaft 10 to surround the outer circumferential surface of the shaft 10.

On the outer surface of the rotor 20, a mold part 30 for enclosing the rotor 20 is mold molded. The mold part 30 is formed such that the upper end of the mold part 30 is in contact with the lower surface of the sensing plate 40.

As shown in FIG. 5, at least one protrusion 31a for guiding the position of the sensing plate 40 and fitting the sensing plate 40 to the mold unit 30 is provided at an upper end of the mold unit 30. Protruding toward the sensing plate 40 is formed. The protrusion 31a may guide the fixing angle of the sensing plate 40 through the formed position.

The protrusion 31a is formed at a position corresponding to the first hole 42a of the sensing plate 40 described later. The protrusion 31a is fitted into the first hole 42a of the sensing plate 40 and then performs a function of fixing the sensing plate 40 to the mold unit 30 through a heat fusion process. Accordingly, the sensing plate 40 is fixed to the shaft 10.

The protrusion 31a is provided integrally with the mold part 30 and may be formed through mold molding. The mold molding process may be performed using a mold resin such as polyester.

Meanwhile, although FIG. 5 illustrates a case in which three protrusions 31a are formed at the upper end of the mold part 30, fewer or more protrusions may be formed at the upper end of the mold part 30.

Referring to FIG. 3, the sensing plate 40 includes a through hole 41 in which a shaft 10 is inserted into a central portion in a disc shape. As illustrated in FIG. 6, the sensing magnet 50 may be magnetized on the outer side of the sensing plate 40, and at least one first hole 42a may be formed on the inner side where the sensing magnet 50 is not magnetized.

Meanwhile, in FIG. 3, the inner region is formed to protrude upward from the outer region with respect to the through hole formed at the center of the sensing plate 40 as an example, but embodiments of the present invention are not limited thereto. Make it clear.

In addition, although FIG. 3 illustrates the case where there are three first holes 42a formed in the sensing plate 40, according to embodiments of the present invention, the first holes 42a formed in the sensing plate 40 are larger than that. It may be few or many.

4 and 6, the sensing magnet 50 is magnetized to the upper surface of the sensing plate 40 in a disk shape. The sensing magnet 50 may be fixed to the sensing plate 40 using an adhesive or the like.

The sensing magnet 50 is coupled to the shaft 10 through the sensing plate 40 and rotates along the shaft 10.

The sensing magnet 50 includes a main magnet 52 disposed in the circumferential direction adjacent to the shaft 10 and a sub magnet 51 formed on the outer circumferential side thereof.

The main magnet 52 is composed of a plurality of poles arranged in the same manner as the magnet inserted into the rotor 20 of the motor. The sub-magnet 51 is made up of more poles than the main magnets 52, so that one pole of the main magnets 52 is further subdivided. That is, the sub magnet 51 arranges a plurality of poles corresponding to one pole of the main magnet 52.

A dummy magnet 53 is disposed between the main magnet 52 and the sub magnet 51 to minimize magnetic flux interference between the main magnet 52 and the sub magnet 51.

5 and 6, in a state in which the rotor 20 is coupled to the shaft 10, the sensing part 40 to which the sensing magnet 50 is coupled surrounds the outer surface of the rotor 20. ) Fits on the top part. Accordingly, the projections 31a formed at the upper end of the mold part 30 are fitted into the first holes 42a formed in the sensing plate 40, respectively. Subsequently, the protrusion 31a protruding upward of the sensing magnet 50 is bonded to the sensing plate 40 through a heat fusion process, whereby the sensing plate 40 is fixed to the mold part 30.

Hereinafter, a motor according to a second embodiment of the present invention will be described in detail with reference to FIGS. 7 to 11.

7 is a side cross-sectional view illustrating an assembly structure in which a sensing plate of a motor according to a second embodiment of the present invention is assembled to a shaft. 8 is a perspective view illustrating a sensing plate according to a second embodiment of the present invention, and FIG. 9 is a perspective view illustrating a sensing magnet according to a second embodiment of the present invention. 10 is a perspective view illustrating a mold part according to a second embodiment of the present invention, and FIG. 11 is a view illustrating an assembly structure of a mold part and a sensing plate according to the second embodiment of the present invention.

7 to 11, the motor is in contact with the shaft 10, the rotor 20 surrounding the shaft, the mold part 30 packaged to surround the outer surface of the rotor 20, and the upper end of the mold part 30. And a sensing magnet 50 assembled to contact the upper end of the sensing plate 40 and the sensing plate 40. Since the shaft 10 and the rotor 20 are the same components as the shaft 10 and the rotor 20 according to the first embodiment of the present invention described above, a detailed description thereof will be omitted below.

As shown in FIG. 10, at least one protrusion 31b for guiding the position of the sensing plate 40 and fitting the sensing plate 40 to the mold unit 30 is provided at the upper end of the mold unit 30. Protruding toward the sensing plate 40 is formed. The protrusion 31b may guide the fixing angle of the sensing plate 40 through the formed position.

The protrusion 31b is formed at a position corresponding to the first hole 42b of the sensing plate 40 and the second hole 54 of the sensing magnet 50, which will be described later. The projection 31b is fitted into the first hole 42b of the sensing plate 40 and the second hole 54 of the sensing magnet 50, and then, the sensing plate 40 and the sensing magnet (eg, through a heat fusion process). The function of fixing 50 to the mold unit 30 is performed. Accordingly, the sensing plate 40 is fixed to the shaft 10.

The protrusion 31b is provided integrally with the mold part 30 and may be formed through mold molding. The mold molding process may be performed using a mold resin such as polyester.

Meanwhile, although FIG. 10 illustrates a case in which three protrusions 31b are formed at the upper end of the mold part 30, fewer or more protrusions may be formed at the upper end of the mold part 30.

Referring to FIG. 8, the sensing plate 40 includes a through hole 41 in which a shaft 10 is inserted into a central portion in a disc shape. The sensing magnet 50 is magnetized on the outside of the sensing plate 40 as shown in FIG. 11. At least one first hole 42b may be formed in an outer region of the sensing plate 40 on which the sensing magnet 50 is magnetized. The first hole 42b is formed to face each protrusion 31b formed at the upper end of the mold part 30, and is formed in an area corresponding to the dummy magnet 53 in the sensing magnet 50 to be described later. A second hole 54 corresponding to the dummy magnet 53 of the sensing magnet 50 is formed.

Meanwhile, although FIG. 8 illustrates an example in which the inner region protrudes upward from the outer region with respect to the through hole formed at the center of the sensing plate 40, the embodiments of the present invention are not limited thereto. Make it clear. In addition, although FIG. 8 illustrates the case where there are three first holes 42b formed in the sensing plate 40, the first holes 42b formed in the sensing plate 40 may be larger than the first holes 42b formed in the sensing plate 40. It can be few or many.

8 and 11, the sensing magnet 50 is magnetized to the upper surface of the sensing plate 40 in a disk shape. The sensing magnet 50 may be fixed to the sensing plate 40 using an adhesive or the like.

The dummy magnet 53 is formed with at least one second hole 54 into which the protrusion 31b formed at the upper end of the mold part 30 is fitted. The sensing magnet 50 may be magnetized to the sensing plate 40 so that the second holes 54 formed in the dummy magnet 53 are aligned with the respective first holes 42b formed in the sensing plate 40.

10 and 11, in the state in which the rotor 20 is coupled to the shaft 10, the sensing unit 40 to which the sensing magnet 50 is coupled surrounds the outer surface of the rotor 20. ) Fits on the top part. Accordingly, the projection 31b formed at the upper end of the mold part 30 is inserted through the first hole 42b of the sensing plate 40 and the second hole 54 formed in the sensing magnet 50 in order. . Thereafter, the protrusion 31b protruding upward from the sensing magnet 50 is bonded to the sensing magnet 50 through a heat fusion process, whereby the sensing plate 40 and the sensing magnet 50 are attached to the mold part 30. It is fixed.

Meanwhile, in the above-described first and second embodiments of the present invention, the protrusions 31a and 31b are integrally molded in the mold part 30 as an example, but embodiments of the present invention are not limited thereto. You may not. The plate including the protrusion may be separately made of a plastic material, and the plate may be implemented in a structure in which the plate is bonded to the mold part through a mold molding process.

12 and 13, the disk-shaped plate 70 has a through hole for assembling the shaft 10 at the center thereof, and a protrusion 71 for coupling the sensing plate 40 to the upper end thereof. do. The plate 70 may be integrally assembled with the mold part 60 by attaching the lower end part to the mold part 60 in the process of molding the rotor 20.

According to the embodiments of the present invention described above, the sensing plate may be fixed to the shaft without a pressing process. Accordingly, there is no need for the press-fitting process equipment, thereby reducing the equipment. In addition, it is possible to prevent shaking of the sensing magnet by indentation and to maintain the magnetization angle of the sensing magnet at a constant level, thereby improving the hall signal, thereby reducing signal defects.

Although described above with reference to a preferred embodiment of the present invention, those skilled in the art will be variously modified and changed within the scope of the invention without departing from the spirit and scope of the invention described in the claims below I can understand that you can.

10: shaft
20: rotor
30: mold part
31a, 31b: turning
40: sensing plate
42a, 42b: first hole
50: sensing magnet
54: second hall

Claims

shaft;
A rotor engaged with the shaft;
A mold part disposed outside the rotor;
A sensing plate disposed on the mold part; And
It includes a sensing magnet disposed on the upper surface of the sensing plate,
The rotor includes a rotor core coupled to the shaft and a magnet disposed outside the rotor core,
The mold part is disposed to surround the outer surface of the magnet of the rotor,
The mold part includes a plurality of protrusions protruding upward from an upper surface of the mold part.
The sensing plate includes a plurality of first holes in which the plurality of protrusions are disposed,
The sensing magnet includes a plurality of second holes formed to correspond to the positions of the plurality of first holes,
The sensing magnet includes a sub magnet disposed at an edge of the sensing plate, a main magnet disposed inside the sub magnet, a dummy magnet disposed between the sub magnet and the main magnet,
The plurality of second holes are formed in an area in which the dummy magnet is disposed between the sub magnet and the main magnet.

The method of claim 1,
The plurality of first holes are formed in an area where the sensing magnet is not disposed between the shaft and the sensing magnet.

The method of claim 2,
The plurality of protrusions are bonded to the sensing plate through heat fusion in a state that penetrates the plurality of first holes.

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The method of claim 1,
The protrusion of the mold part is assembled to pass through the second hole sequentially after the first hole.

The method of claim 6,
The protrusion of the mold part is bonded to the sensing magnet through heat fusion in a state of being fitted into the first hole and the second hole.

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