KR20140122334A

KR20140122334A - Motor

Info

Publication number: KR20140122334A
Application number: KR1020130038607A
Authority: KR
Inventors: 김진호; 박경상; 박창현; 심우섭
Original assignee: 엘지이노텍 주식회사
Priority date: 2013-04-09
Filing date: 2013-04-09
Publication date: 2014-10-20

Abstract

Disclosed is a motor which includes a housing, a stator arranged in the housing, a rotor which rotates in the center of the stator and has a receiving space into which a hollow member protruding from the bottom surface of the housing is inserted, a nut member which rotates in the hollow member and is partly combined with the rotor to rotate with the rotor, a screw which penetrates the rotor, the nut member, and the hollow member and moves straight by the rotation of the nut member, a sensing magnet which is installed at the rotor and rotates with the rotor; and a magnetic element which faces the sensing magnet.

Description

Motor {MOTOR}

The present invention relates to a motor structure which is excellent in responsiveness and can accurately sense the rotation of the rotor.

Generally, a motor forms an outer appearance of a motor by a combination of a housing and a cover member, and a stator is disposed on an inner peripheral surface of the housing. A rotor is disposed in the center of the stator and rotates in accordance with an electromagnetic interaction with the stator. However, in general, since the rotor is formed by stacking a plurality of cores, there is a problem that the responsiveness of the motor is deteriorated by the weight.

On the other hand, as disclosed in Korean Patent Laid-Open Publication No. 2013-0011663, a printed circuit board on which a magnetic element is mounted is provided inside the cover member. The magnetic element senses the magnetic force of the sensing magnet installed rotatably with the rotor, and grasps the current position of the rotor.

Generally, the sensing magnet is fixed to a plate provided on the upper side of the rotor. When the sensing magnet is mounted on the plate, the position of the rotor can be sensed by engaging the plate with the direction of the magnetic field to the rotation axis.

However, such a sensing structure is accompanied by a separate mechanism (a bracket, a rotary gear, and a gear flange), which limits the downsizing of the motor and makes it difficult to accurately measure the engagement failure of the rotor and the mechanism.

Particularly, when the rotary gear is used, there is a problem that the coupling structure of the gear is worn out during high-speed rotation of the motor, and accurate sensing is difficult.

According to the present invention, the structure of the rotor is changed to provide a motor excellent in responsiveness.

The present invention also provides a motor provided with a sensing structure capable of sensing the rotation of the rotor without any other mechanism.

A motor according to one aspect of the present invention includes: a housing; A stator disposed within the housing; A rotor rotatably disposed at the center of the stator and having a housing space in which a hollow member protruding from a bottom surface of the housing is inserted; A nut member rotatably disposed in the hollow member, and a part of which is coupled with the rotor and rotates integrally with the rotor; A screw passing through the rotor, the nut member, and the hollow member and linearly moving by rotation of the nut member; A sensing magnet mounted on the rotor and rotating integrally with the rotor; And a magnetic element disposed opposite the sensing magnet.

In the motor according to one aspect of the present invention, the end of the rotor side wall protrudes in the rotational direction, and a sensing magnet is attached to the inner circumferential surface of the protruded side wall.

According to another aspect of the present invention, there is provided a motor comprising: a housing; A stator disposed inside the housing; A rotor rotatably disposed in the center of the stator, and a nut member coupled to the rotor and integrally rotating; A screw passing through the rotor and the nut member and linearly moving by rotation of the nut member; A sensing magnet mounted on the rotor assembly and rotating integrally therewith; And a magnetic element spaced apart from the sensing magnet.

According to the present invention, the structure of the rotor is changed to improve the responsiveness.

In addition, by providing the sensing magnet directly on the side wall of the rotor, the rotation angle of the rotor can be directly sensed without using a separate structure (e.g., a bracket or a rotary gear), and the motor can be miniaturized.

Further, there is an advantage that the sensing magnet can sense the accurate rotation angle by rotating integrally with the rotor.

1 is an exploded perspective view of a motor according to an embodiment of the present invention,
2 is a cross-sectional view of a motor according to an embodiment of the present invention,
3 is a conceptual view showing a coupling structure of a rotor and a nut member according to an embodiment of the present invention,
FIG. 4 is a view showing a dual air gap structure of a motor according to an embodiment of the present invention, and FIG.
5 is a sectional view of a structure in which a rotor and a hollow member are combined according to an embodiment of the present invention,
6 is a modification of the motor according to an embodiment of the present invention,
7 is a cross-sectional view of a motor according to another embodiment of the present invention,
8 is a conceptual view showing a state where a rotor is coupled to a nut member according to another embodiment of the present invention,
9 is a modification of Fig.

The present invention is capable of various modifications and various embodiments, and specific embodiments are illustrated and described in the drawings. It should be understood, however, that the invention is not intended to be limited to the particular embodiments, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.

Terms including ordinals, such as first, second, etc., may be used to describe various elements, but the elements are not limited to these 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 a first component, and similarly, the first component may also be referred to as a second component. And / or < / RTI > includes any combination of a plurality of related listed items or any of a plurality of related listed items.

It is to be understood that when an element is referred to as being "connected" or "connected" to another element, it may be directly connected or connected to the other element, . On the other hand, when an element is referred to as being "directly connected" or "directly connected" to another element, it should be understood that there are no other elements in between.

The terminology used in this application is used only to describe a specific embodiment and is not intended to limit the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise. In the present application, the terms "comprises" or "having" and the like are used to specify that there is a feature, a number, a step, an operation, an element, a component or a combination thereof described in the specification, But do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or combinations thereof.

Hereinafter, embodiments will be described in detail with reference to the accompanying drawings, wherein like or corresponding elements are denoted by the same reference numerals, and redundant description thereof will be omitted.

FIG. 1 is an exploded perspective view of a motor according to an embodiment of the present invention, and FIG. 2 is a sectional view of a motor according to an embodiment of the present invention.

Referring to FIGS. 1 and 2, a motor according to an embodiment of the present invention includes a housing 110, a stator 130 disposed inside the housing 110, A rotor 140 having a receiving space in which the hollow member 170 protruding from the bottom surface of the housing 110 is inserted and a rotatably disposed inside the hollow member 170, A nut member 150 coupled to the rotor 140 and rotating integrally with the rotor 140 and a nut member 150 coupled to the rotor 140 through the nut member 150, And a screw 160 which is linearly moved by the screw 160.

The housing 110 is provided with an internal space in which the stator 130 and the rotor 140 are accommodated. The housing 110 is engaged with the cover 120 to seal the stator 130 and the rotor 140 in the inner space. At this time, the structure of the housing 110 and the cover 120 can be variously modified as needed.

The stator 130 may have a known shape in which a coil is wound around the stator core. A space portion 133 is formed at the center of the stator 130, and the rotor 140 is rotatably inserted. The bus bar 132 connects the end 131 of the coil wound around the stator core to the input / output terminal. The shapes of the bus bars 132 vary depending on the power source to be connected. In general, the respective input / output terminals are sequentially disposed on the outer circumferential surface of the bus bar 132.

The rotor 140 includes a rotor core 141 having a receiving space therein for inserting the hollow member 170 protruding from the bottom surface of the housing 110 and a drive magnet 141 attached to the outer circumferential surface of the rotor core 141 142, and a mold cover 143 for protecting the magnet.

The rotor 140 is rotated by electromagnetic interaction with the stator 130, and the nut member 150 coupled with the rotor also rotates integrally. At this time, the nut member 150 is rotatably supported by the hollow member 170.

The screw 160 is coupled through the nut member 150, the rotor 140, and the hollow member 170. The screw 160 is coupled with the nut member 150 in the form of a ball screw, and linearly moves according to the rotation of the nut member 150.

Although not shown, the end of the screw 160 may be connected to a master cylinder of a vehicle brake system. The brake system can be operated by pressing the master cylinder with the screw 160 linearly moving in accordance with the rotation of the motor. However, the motor according to the present invention can be applied to various kinds of systems in which the screw 160 can be operated by linear motion by the rotational motion of the rotor 140. (Eg, accelerator pedal system, stepping motor, etc.)

FIG. 3 is a conceptual view showing a coupling structure of a rotor and a nut member according to an embodiment of the present invention, FIG. 4 is a view showing a double air gap structure of a motor according to an embodiment of the present invention, FIG. 6 is a cross-sectional view of a structure in which a rotor and a hollow member are combined according to an embodiment of the present invention, and FIG. 6 is a modification of the motor in an embodiment of the present invention.

Referring to FIG. 3, the rotor core 141 may have a receiving space S and an open end. An opening 141c through which the screw 160 passes is formed on the other side. This rotor 140 structure is light in comparison with the rotor core 141 in which a plurality of cores are stacked, so that the response speed of the motor can be increased.

Therefore, when applied to a brake system of a vehicle, there is an advantage that the responsiveness to the brake control of the occupant is excellent. Such a rotor core can be manufactured by injection molding.

A nut member 150 is coupled to the other side surface of the rotor 140 to rotate integrally. However, the present invention is not limited thereto, and the rotor core 141 and the nut member 150 may be integrally formed.

4, a motor according to the present invention has a first gap G1 between the stator 130 and the rotor 140 and a second gap G1 between the hollow member 170 and the rotor core 141. [ G2) are formed. Accordingly, the rotor 140 is rotatably disposed in the space between the stator 130 and the hollow member 170. [

A nut member (150) is rotatably inserted into the hollow member (170). The hollow member 170 is inserted into the receiving space S of the rotor 140 to prevent leakage of the flux generated when the rotor 140 rotates.

The hollow member 170 is formed in a hollow pipe shape and is fixed to the bottom surface of the housing 110. The hollow member 170 may be formed integrally with the housing 110 by injection, but may be separately formed and then coupled to the housing 110.

A needle bearing 181 and a thrust bearing 182 may be disposed in the hollow member 170 to support the rotation of the nut member 150. However, the present invention is not limited thereto, and the bearing structure may be integrally formed on the inner surface of the hollow member 170. [

In order to increase the response speed, the rotor 140 is formed of a cup-shaped member having a thin wall and an endless hollow. The driving magnet 142 and the sensing magnet 192 are attached to the side wall. At this time, the drive magnet 142 and the sensing magnet 192 are spaced apart from each other by a predetermined distance. At this time, the drive magnet 142 is covered by the mold cover 143.

Specifically, a plurality of drive magnets 142 may be mounted on the side wall of the rotor core 141, and the sensing magnet 192 may be mounted on the end 141a of the side wall.

The end 141a of the rotor core 141 protrudes in the rotational direction (X direction in FIG. 4), and the sensing magnet 192 may be attached to the inner circumferential surface of the protruded side wall. In this case, since the drive magnet 142 and the sensing magnet 192 are sufficiently isolated, there is an advantage that the sensing sensitivity is increased. In addition, since the sensing magnet 192 is attached to the inner circumferential surface of the protruded sidewall 141a, the sensing magnet 192 can be prevented from being released even when the motor rotates at a high speed.

The substrate 190 on which the magnetic element is mounted can be arranged in a direction substantially perpendicular to the longitudinal direction of the screw or in a horizontal direction (X and Y directions in FIG. 4) to sense the rotation of the sensing magnet. Therefore, the substrate can be fixed without a separate bracket, and the motor can be downsized.

The substrate 190 is disposed between the hollow member 170 and the rotor 140 such that the magnetic element 192 faces the sensing magnet 191. In particular, a flat surface 171 on which the substrate 190 is mounted may be formed on the side surface of the hollow member 170. The flat surface 171 may be provided by cutting-out the side surface of the hollow member.

Since the hollow member 170 is firmly fixed to the bottom surface of the housing 110, the magnetic element 191 attached to the hollow member 170 is also advantageous against vibration. The magnetic element may be a Hall IC (Hall IC).

According to this structure, since the sensing magnet 192 is provided directly on the side wall of the rotor 140, the rotation angle of the rotor 140 can be directly sensed without using any other mechanism (for example, a bracket or a rotary gear) There is an advantage that the sensing angle of the sensing magnet 192 can be more accurately sensed by rotating integrally with the rotor 140 without a separate connection member.

However, the arrangement of the magnetic element 191 sensing the sensing magnet 192 can be variously modified. For example, the magnetic element 191 may be disposed on the lower side of the sensing magnet 192 as shown in Fig. At this time, the substrate 190 may be attached to the flat surface 171 or disposed below the sensing magnet 192.

6, a flange 152 may be attached to the lower side of the nut member 150 so as to rotate integrally therewith. The flange 152 may have a hollow cylindrical shape, and a sensing magnet 192 may be attached to the end of the flange 152. Therefore, when the rotor 140 rotates, the nut member 150, the flange 152, and the sensing magnet 192 rotate integrally. The substrate 190 may be attached to the flat surface 171 or may be fixedly mounted to the housing separately.

FIG. 7 is a cross-sectional view of a motor according to another embodiment of the present invention, FIG. 8 is a conceptual view showing a state where a rotor is coupled to a nut member according to still another embodiment of the present invention, to be.

Referring to FIGS. 7 and 8, the motor according to another embodiment of the present invention includes a housing 210, a stator 230 disposed inside the housing 210, A rotor assembly 240 and 250 including a rotatably disposed rotor 240 and a nut member 250 integrally coupled to the rotor 240 and a rotor 240 and a nut member 250 And a sensing magnet 292 mounted on the rotor assemblies 240 and 250 and rotating integrally therewith. The sensing magnet 292 rotates integrally with the sensing magnet 292 facing each other.

The rotor 240 includes a rotor core 241 in which a plurality of cores are stacked and a drive magnet 242 and a mold cover 243 mounted on the outer surface of the core 241. [ The rotor 240 is inserted into the nut member 250 to constitute the rotor assemblies 240 and 250 and rotate integrally.

The nut member 250 is formed of a cylindrical member, and a thread is formed on a part of the inner circumferential surface thereof to linearly move the screw 260. The nut member 250 has a cylindrical extending portion 251 extending to both sides and one end of the extension portion is supported by the first bearing 281 and the other end is rotatably supported by the second bearing 282.

The rotor 240 is disposed between the first bearing 281 and the second bearing 282. A drive magnet 242 and a sensing magnet 292 may be spaced apart from each other on the outer circumferential surface of the rotor 240. At this time, a step may be formed at the end 241a of the rotor to insert the sensing magnet 292.

The substrate 290 may be disposed substantially perpendicular or perpendicular to the longitudinal direction of the screw 260 so that the magnetic element 291 is disposed opposite the sensing magnet 292.

However, the sensing structure for sensing the rotation of the rotor is not necessarily limited to this, but can be variously modified. For example, as shown in FIG. 9, the sensing magnet 292 may be disposed between the end 251a of the nut member and the second bearing 282.

That is, a configuration in which a sensing magnet is attached to any portion of the outer circumferential surface of the rotor assembly 240 or 250 to detect the rotation of the rotor is included in the scope of the present invention.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the present invention as defined by the following claims It can be understood that

110: Housing
120: cover
130:
140: Rotor
150: Nut member
160: Screw
170: hollow member
190: substrate
191: magnetic element
192: sensing magnet

Claims

housing;
A stator disposed within the housing;
A rotor rotatably disposed at the center of the stator and having a housing space in which a hollow member protruding from a bottom surface of the housing is inserted;
A nut member rotatably disposed in the hollow member, and a part of which is coupled with the rotor and rotates integrally with the rotor;
A screw passing through the rotor, the nut member, and the hollow member and linearly moving by rotation of the nut member;
A sensing magnet mounted on the rotor and rotating integrally with the rotor; And
And a magnetic element disposed opposite the sensing magnet.

The method according to claim 1,
Wherein a plurality of drive magnets are mounted on a side wall of the rotor and the sensing magnet is mounted at a position spaced apart from the drive magnet.

3. The method of claim 2,
And the sensing magnet is mounted on one end of the rotor side wall.

The method of claim 3,
Wherein an end of the rotor side wall protrudes in a rotating direction and a sensing magnet is attached to an inner circumferential surface of the protruded side wall.

The method according to claim 1,
A cylindrical flange coupled to the nut member, and a sensing magnet attached to an end of the flange.

The method according to claim 1,
And a substrate on which the magnetic element is mounted, the substrate being disposed between the hollow member and the rotor.

The method according to claim 6,
And a flat surface on which the substrate is seated is formed in the hollow member.

housing;
A stator disposed inside the housing;
A rotor rotatably disposed in the center of the stator, and a nut member coupled to the rotor and integrally rotating;
A screw passing through the rotor and the nut member and linearly moving by rotation of the nut member;
A sensing magnet mounted on the rotor assembly and rotating integrally therewith; And
And a magnetic element spaced apart from the sensing magnet.

9. The method of claim 8,
A first bearing supporting one side of the nut member and a second bearing supporting the other side, the rotor being disposed between the first bearing and the second bearing.

9. The method of claim 8,
A drive magnet and a sensing magnet are mounted on an outer circumferential surface of the rotor, and the drive magnet and the sensing magnet are disposed apart from each other.

9. The method of claim 8,
And a sensing magnet is mounted between an end of the nut member and the second bearing.