KR102008839B1

KR102008839B1 - Motor

Info

Publication number: KR102008839B1
Application number: KR1020120108195A
Authority: KR
Inventors: 심우섭
Original assignee: 엘지이노텍 주식회사
Priority date: 2012-09-27
Filing date: 2012-09-27
Publication date: 2019-08-08
Also published as: KR20140042073A

Abstract

The motor according to an embodiment of the present invention includes a motor housing; A stator installed in the motor housing and comprising a stator core, an insulator, and a coil having a plurality of teeth; A rotor rotatably installed in the center of the stator, the rotor including a through hole formed in the center and a magnet module installed on a surface of the stator; And a back flux member inserted into and coupled to the through hole at an outer side of the motor housing.

Description

Motor

The present invention relates to a motor.

In general, a brushless motor can generate power by electromagnetic interaction between a coiled stator and a rotor having a magnet disposed at the center of the stator. In this case, the magnet installed in the rotor may be installed on the surface of the rotor core or may be installed by forming a pocket inside the rotor core.

When the magnet is installed on the surface of the dual rotor core, the magnet is attached / fixed by applying an adhesive to the surface of the rotor core. In general, the magnet is generally fixed by arranging a plurality of magnet members having the same size. .

Since the rotor has a form in which the rotating shaft is press-fitted to the center of the rotor core, the rotor core can have a thickness, so that guide ribs are formed on the surface of the rotor core in order to regulate the magnet bonding position, or grooves having a constant size are formed. A magnet can be attached to this groove.

However, in the case of a tube-shaped rotor that needs to form a space in the center of the rotor core in order to convert the rotational power of the rotor into a linear reciprocating motion, the rotor core generally has a thin thickness like a pipe and has a space in the center. Since it should be formed, it is difficult to form a guide rib or a magnet seating groove for attaching the magnet as described above, the magnet is attached to the surface of the smooth core-shaped rotor core.

In the center of the tube-shaped rotor core, a back flux ring may be installed to prevent magnetic flux loss of the magnet installed in the rotor. In general, the back flux ring is press-fitted to the center of the motor housing when the motor is assembled. The rotor is press-fitted to be coaxial with the back flux ring.

However, according to such an assembly structure, wear may occur in the lower bearing, the back flux ring, and the like during the sliding fit process for press-fitting the rotor, which may reduce the life of the motor.

In addition, when assembling the rotor, as the rotor lower end cannot be supported, assembly of the rotor is cumbersome, and a defect such as assembling the rotor in an incorrect position may occur.

Japanese Laid-Open Patent Publication No. 2009-244903 (published Aug. 29, 2003)

It is an object of the present invention to provide a motor having an improved structure so that friction damage does not occur in a bearing and a back flux ring during the assembly process of a motor having a tube-shaped rotor core.

The back flux member may be formed to have a diameter smaller than that of the through hole, and the back flux member may be inserted into the through hole formed at the center of the rotor after the rotor is press-fitted to the motor housing.

The rotor may be provided in a tubular shape having a thin thickness between the inner circumferential surface of the through hole and the surface on which the magnet module is installed.

An upper bearing rotatably supporting an upper end of the rotor; And a lower bearing rotatably supporting the lower end of the rotor, the lower bearing being sliding fit in the same direction as the back flux member, and the motor housing accommodating the lower bearing at the outer lower end thereof. can do.

The motor housing may have a protrusion protruding from the back flux member to an outer bottom surface thereof.

The back flux member may include a coupling groove having a shape complementary to the protrusion.

The diameter of the protrusion and the coupling groove may be smaller than the diameter of the motor housing.

The back flux member may be spaced apart from the lower bearing and the rotor by a predetermined distance.

The end of the rotor may be press-fit to the inner ring of the lower bearing, the back flux member may be press-fit to the through-hole formed in the center of the rotor.

The back flux member includes a pipe-shaped body having a space in the center; And a base part integrally formed with the body and forming a seating groove part having a shape corresponding to the shape of the bottom surface of the motor housing.

The back flux member may be formed of a metal material, and the body and the base part may be formed in one body.

Since the lower bearing can be assembled outside the motor housing, the rotor can be press-fitted to the inner ring of the lower bearing, thereby preventing wear of the rotor outer diameter and improving durability.

Since the back flux member is assembled last, it is possible to press-fit the rotor while supporting the rotor from both the upper side and the lower side during the rotor indentation process, thereby minimizing the assembly error due to the coaxial failure.

In addition, when assembling the back flux member, the outer side is press-fitted structurally, thereby minimizing the bending moment that may occur when the inside is pushed inward, so that deformation such as bending occurs in the back flux member during the press-fit process of the back flux member. You can minimize it.

1 to 2 are cross-sectional views schematically showing an assembly process of a motor according to an embodiment of the present invention, and
3 is a cross-sectional view of a motor according to an embodiment of the present invention.

Hereinafter, a motor according to an embodiment of the present invention will be described with reference to the drawings.

1 to 2 are cross-sectional views schematically showing an assembly process of a motor according to an embodiment of the present invention, and FIG. 3 is a cross-sectional view of a motor according to an embodiment of the present invention.

As shown in FIG. 1, as shown, the motor according to the present invention includes a motor housing 10, a stator 20, a rotor 30, and a back flux member 100.

Motor housing 10 is provided in a cylindrical shape, as shown in Figure 1, has an opening that is open on the upper side, through the upper opening, so that the stator 20 and the rotor 30 can be inserted coupling. Can be configured. As shown in the drawing, the motor housing 10 forms a through hole in a bottom surface thereof, such that a lead screw (not shown) installed at the center of the rotor 30 may be installed to reciprocate. In addition, the upper opening may be closed by a cover member.

The motor housing 10 may be provided with a cylindrical accommodating groove 11 at a lower side thereof, and a lower bearing 12 having a shape corresponding to the accommodating groove 11 may be installed. At this time, the receiving groove 11 is provided on the outside of the motor housing 10, the lower bearing 12 can be inserted into the coupling from the outside of the motor housing (10).

As shown in FIGS. 1 and 2, the bottom surface of the motor housing 10 may form a protrusion 15 including a step, wherein the protrusion 15 may be formed in the back of the back flux member 100. It may be fitted and coupled with the coupling groove 105 is provided in a shape corresponding to the protrusion 15.

In the inner space of the motor housing 10, a stator 20 may be installed in which a plurality of coils are wound. The stator 20 may be composed of a stator core 21, an insulator 22, and a coil.

The stator core 21 may be provided as a metal block, or a plurality of core plates made of a thin plate may be stacked. A plurality of teeth may protrude from the stator core 21 toward the surface facing the rotor 30, and coils may be wound around the teeth through the insulator 22.

The insulator 22 is coupled to the upper side and the lower side of the stator core, respectively, and serves to insulate the coil wound around the tooth from being energized with the stator core. The insulator may be formed of a resin material.

The rotor 30 includes a rotor core 31 having a thin thickness and a magnet module 33 adhesively fixed to the surface of the rotor core 31, having a tubular shape as shown in FIG. 1, and having a disk on the top thereof. Shaped guide plate 34 may be formed.

The rotor core 31 may be provided in a tube shape, and both ends of the rotor core 31 may be rotatably installed as the upper bearing 32 and the lower bearing 12 in the motor housing 10. The rotor core 31 may have a through hole in the center, as shown in FIGS. 1 to 3. The through hole may be provided with a member that rotates in accordance with the rotation of the rotor core 31 to transmit power of the motor. For example, a nut member may be installed at the center of the rotor core 31. A screw thread is formed on an inner circumferential surface of the nut member. When the rotor core 31 rotates, the nut member rotates in conjunction with a lead screw (not shown) having a tab screwed to the screw thread on an outer circumferential surface thereof. I can move it.

The motor having the tubular rotor core 31 and the nut member may be used for various purposes. For example, the motor having the tubular rotor core 31 and the nut member may be used to reciprocate the pressurizing lead screw of the master cylinder of the brake system. That is, when the rotor core is rotated, the nut member is rotated in conjunction with the rotor core 31, and then a screw thread formed on the inner circumferential surface of the nut member is rotated, thereby moving the lead screw (not shown) in the axial direction. The rotational power of the motor can be converted into linear motion.

The back flux member 100 is installed to reduce leakage flux of the magnet module 33 installed in the rotor 30. According to an exemplary embodiment of the present invention, as shown in FIG. Likewise, after the rotor 30 is press-fit into the motor housing 10, it can finally be coupled. At this time, the back flux member 100 is inserted into a through hole formed in the center of the rotor core 31 as shown, is configured not to interfere with the rotor core 31, the rotation of the rotor core 31 It can be configured not to be affected.

Back flux member 100 according to an embodiment of the present invention is formed integrally with the body 101 and the body 101 of the pipe-shaped having a space in the center, the shape corresponding to surround the protrusion 15 It includes a base portion 102 to form a seating groove 105 of the. The body 101 and the base portion 102 is preferably formed of a metal material such as steel, it may be formed into a body using a press working or the like.

On the other hand, the bottom surface of the seating groove 105, the lower bearing 12 and the rotor 30 need to be spaced apart a certain distance, if, the bottom surface and the lower bearing 12 and the seating groove 105 This is because the rotor 30 may not rotate smoothly when the rotor 30 contacts.

Hereinafter, the assembling procedure of the motor according to the present invention will be described with reference to Figs.

In the motor according to the present invention, the stator 20 is press-fitted into the inner space of the motor housing 10 as shown in FIG. 1, and the lower bearing 12 is coupled to a sliding fit outside the motor housing 10. . The difference between the sliding fit and the press fit is the difference in the forces exerted for the engagement. In other words, in the case of the sliding fit, sliding coupling is possible without using a large force, but in the case of the press fit, it is difficult to combine with a general person's force, and thus there is a difference in combining objects by adding a force such as a press. . Therefore, since a large force is not required when inserting the lower bearing 12 to which the sliding fit is coupled, the lower bearing 12 may not be deformed.

Then, both ends of the rotor 30 may be gripped with a jig or the like not illustrated, and the ends of the rotor 30 may be pressed into the engagement position of the motor housing 10 in the direction A of FIG. At this time, the lower bearing 12 is already sliding fit coupled to the outside of the motor housing 10, the end of the rotor 30 can be press-fitted to the inner ring of the lower bearing 12, the rotor ( Since the upper bearing 32 is first press-fitted to the opposite end of 30, the outer ring of the upper bearing 32 may be press-fitted to the engagement position of the motor housing 10. Therefore, the rotor 30 is not deformed during the press-fitting process of the rotor 30, and since both ends of the rotor 30 are gripped with a jig and assembled to the motor housing 10, assembly failure due to the rotation of the rotor 30 is caused. Can be minimized.

When the assembly of the rotor 30 is completed as described above, as shown in FIG. 2, the back flux member 100 may be coupled to the arrow B direction from the lower side of the outer side of the motor housing 10. In this case, the central axis of the back flux member 100 and the central axis of the rotor 30 may be press-fitted to be coaxial with each other.

In this case, the protrusion 15 is formed on the bottom surface of the motor housing 10, and an accommodation groove 105 is provided at a corresponding position of the back flux member 100, and the protrusion 15 and the accommodation are provided. The groove 105 may be provided in a complementary shape as shown in FIG. 3, and may be coupled to each other according to the press-fit of the back flux member 100.

The lower bearing 12 is not exposed from the outside of the motor housing 10 by the accommodating groove 105, so that a sudden external shock occurs so that the lower bearing 12 is released from the installation position. It may not be separated / lost from the housing 10.

According to the present invention as described above, the interference does not occur at the position except the inner ring of the lower bearing 12 during the press-fit process of the rotor 30, it is possible to minimize the damage to the rotor 30 during the assembly process.

In addition, since the back flux member 100 is inserted and coupled to the last in the state in which the motor housing 10 is supported based on the imaginary line C of FIG. 3, the jig or the like is held at both ends of the rotor 30. It is possible to press-fit to the motor housing 10 in a supported state, thereby reducing the occurrence of assembly failures such as the shaft twisting during the assembly operation of the rotor 30.

In the above, the present invention has been described in detail based on the embodiment and the accompanying drawings. However, the scope of the present invention is not limited by the above embodiments and drawings, and the scope of the present invention will be limited only by the contents described in the claims below.

10; Motor housing 11; Receiving Groove
12; Lower bearing 15; Stone
20; Stator 30; Rotor
31; Rotor bore 32; Upper bearing
33; Magnet module 100; Back Flux Member
101; Through 105; Coupling groove

Claims

Motor housing;
A stator installed in the motor housing and comprising a stator core, an insulator, and a coil having a plurality of teeth;
A rotor rotatably installed in the center of the stator, the rotor including a through hole formed in the center and a magnet module installed on a surface of the stator; And
And a back flux member inserted into and coupled to the through hole at the outside of the motor housing.
The motor housing includes a protrusion that is bent from the outer bottom surface to form a step,
And the back flux member engages the protrusion.

The method of claim 1, wherein the back flux member,
It is formed to have a diameter smaller than the through hole,
And a motor inserted into the through hole formed at the center of the rotor after the rotor is press-fitted to the motor housing.

The method of claim 1, wherein the rotor,
A motor having a tube shape having a thickness defined between an inner circumferential surface of the through hole and a surface on which the magnet module is installed.

The method of claim 1,
An upper bearing rotatably supporting an upper end of the rotor; And
And a lower bearing rotatably supporting a lower end of the rotor and slidingly coupled in the same direction as the back flux member.
The motor housing includes a receiving groove for receiving the lower bearing in the outer lower end.

The method of claim 1,
The rotor includes a disk-shaped guide plate disposed on the top.

The method of claim 1, wherein the back flux member,
A motor comprising a coupling groove of the shape complementary to the protrusion.

The method of claim 1,
The diameter of the protrusion and the coupling groove is smaller than the diameter of the motor housing.

The method of claim 4, wherein the back flux member,
A motor spaced apart from the lower bearing and the rotor by a certain distance.

The method of claim 4, wherein
End of the rotor is press-fit to the inner ring of the lower bearing,
The back flux member is press-fitted to the through-hole formed in the center of the rotor.

The method of claim 1, wherein the back flux member,
A pipe-shaped body having a space in the center; And
And a base part integrally formed with the body and forming a seating groove part having a shape corresponding to the shape of the bottom surface of the motor housing.

The method of claim 10, wherein the back flux member,
It is made of metal
The body and the base is a motor formed in one body.

Motor housing;
A stator installed in the motor housing and comprising a stator core, an insulator, and a coil having a plurality of teeth;
A rotor rotatably installed in the center of the stator, the rotor including a through hole formed in the center and a magnet module installed on a surface of the stator; And
And a back flux member inserted into and coupled to the through hole at the outside of the motor housing.
The back flux member,
A pipe-shaped body having a space in the center; And
And a base part integrally formed with the body and forming a seating groove part having a shape corresponding to the shape of the bottom surface of the motor housing.