KR20220086181A - Rotor and motor having the same - Google Patents

Abstract

Embodiments include stators; a rotor formed of a plurality of unit rotors; and a shaft coupled to the rotor, wherein the unit rotor includes a rotor core coupled to the shaft, a plurality of magnets disposed outside the rotor core, and a can disposed to cover the magnets, the can discloses a motor comprising a pipe-shaped body and a plate portion extending radially from only one of the ends of the body. Accordingly, in the motor, by manufacturing and providing a unit rotor in which a rotor core, a magnet, and a can are previously combined, a bonding process and a hardening process are eliminated from the assembly process, thereby improving the productivity of the motor.

Description

Rotor and motor including same

The embodiment relates to a rotor and a motor including the same.

A motor is a device that converts electrical energy into mechanical energy to obtain rotational force, and is widely used in vehicles, home electronic products, industrial devices, and the like. In particular, the motor may be used in a device for ensuring the stability of steering of a vehicle. For example, the motor may be used in a vehicle motor such as an electronic power steering system (EPS).

The motor may include a housing, a shaft, a stator disposed on an inner circumferential surface of the housing, and a rotor disposed on an outer circumferential surface of the shaft. Here, the stator induces electrical interaction with the rotor to induce rotation of the rotor. In addition, the rotor may be formed by disposing a plurality of unit rotors in an axial direction.

The unit rotor may include a rotor core and a plurality of magnets disposed on the rotor core. According to the arrangement position of the magnet, the rotor includes an IPM (Internal Permanent Magnet) type rotor in which a magnet is inserted into the rotor core, and an SPM (Surface Permanent Magnet) type in which a magnet is attached to the surface of the rotor core. can be divided into rotors.

In the case of the SPM-type rotor, a magnet is attached to the rotor core by using an adhesive member due to its structural characteristics. In addition, a can may be applied to improve assembly durability between the magnet and the rotor core.

The can may serve to protect the rotor and prevent the magnet from being separated. In this case, an adhesive member may be applied to the inside of the can to fix the can to the rotor core on which the magnet is disposed.

However, there is a problem in that the number of steps is increased by the bonding process of applying the adhesive member twice (a bonding process for bonding the rotor core and the magnet, and a bonding process of applying the adhesive member to the inside of the can).

Furthermore, since the bonding process accompanies the curing process of the adhesive member, there is a problem in that the production time is further increased. And, this problem acts as a factor to decrease the productivity of the motor.

Accordingly, there is a need for a rotor capable of improving productivity by reducing the production time according to the unification and bonding process of the unit rotor and the hardening process, and a motor including the same.

The embodiment provides a rotor formed using a plurality of unitized unit rotors and a motor including the same.

The embodiment provides a rotor having improved productivity by eliminating a bonding process and a hardening process from an assembly process by using a unit rotor in which a rotor core, a magnet, and a can are combined in advance, and a motor including the same.

The problems to be solved by the embodiment are not limited to the problems mentioned above, and other problems not mentioned here will be clearly understood by those skilled in the art from the following description.

The task is a stator; a rotor formed of a plurality of unit rotors; and a shaft coupled to the rotor, wherein the unit rotor includes a rotor core coupled to the shaft, a plurality of magnets disposed outside the rotor core, and a can disposed to cover the magnets, the can is achieved by a motor comprising a pipe-shaped body and a plate portion extending radially from only one of the ends of the body.

Here, based on the lower surface of the rotor core, the axial length L3 of the body may be smaller than the axial length L1 of the rotor core and greater than the axial length L2 of the magnet. In addition, the thickness t of the can may be smaller than a difference L1-L2 between the axial length L1 of the rotor core and the axial length L2 of the magnet.

Also, a plate portion of any one of the adjacent unit rotors may be disposed between the magnets of one unit rotor disposed adjacent to each other in the axial direction and the magnets of another unit rotor.

In addition, when any one of the adjacently disposed unit rotors is disposed between the magnets of one of the unit rotors disposed adjacently in the axial direction and the magnets of the other unit rotors, any one of the plate portions of the unit rotors may be disposed adjacent to the other unit. It may be formed to have a predetermined separation distance (G) from the magnet of the rotor.

In addition, one magnet of the unit rotors disposed adjacent to each other in the axial direction may contact the magnets of the other unit rotors.

Meanwhile, the rotor core may include a rotor core body and a guide protruding in a radial direction from an outer circumferential surface of the rotor core body, and an outer surface of the guide may be in contact with an inner circumferential surface of the plate part.

In addition, the plate portion disposed in one of the unit rotors and one surface in the axial direction of the magnet may be in contact with each other.

The task is a stator; a rotor disposed to correspond to the stator; and a shaft coupled to the rotor, wherein the rotor includes a first unit rotor, a second unit rotor disposed below the first unit rotor, and a third unit rotor disposed below the second unit rotor. Including, wherein each of the first unit rotor, the second unit rotor, and the third unit rotor is disposed to cover a rotor core coupled to the shaft, a plurality of magnets disposed outside the rotor core, and the magnets wherein the can includes a pipe-shaped body and a plate portion extending in a radial direction from only one of the ends of the body, and the plate portion of the can disposed on the second unit rotor is the first unit rotor. This is achieved by a motor disposed to face a lower surface of the magnet disposed on the , and a lower surface of the magnet disposed on the second unit rotor to face the upper surface of the magnet disposed on the third unit rotor.

Here, a space is formed in the axial direction between the lower surface of the magnet disposed on the first unit rotor and the plate portion of the can disposed on the second unit rotor, and the lower surface of the magnet disposed on the second unit rotor and the second unit rotor The upper surfaces of the magnets disposed on the three-unit rotor may contact each other.

The object is formed of a plurality of unit rotors arranged in an axial direction, wherein the unit rotor includes a rotor core, a plurality of magnets arranged along an outer circumferential surface of the rotor core, and a can arranged to cover the magnets, The can includes a pipe-shaped body and a plate portion extending radially from only one of the ends of the body, and in one of the unit rotors, one axial surface of the magnet is in contact with the plate portion, and the other axial surface is in contact with the plate portion. This is achieved by the rotor exposed from the can.

The embodiment may improve productivity by using a plurality of unitized rotors. In detail, by manufacturing and providing a unit rotor in which the rotor core, the magnet, and the can are previously combined, the bonding process and the hardening process can be eliminated from the assembly process of the motor. Accordingly, it is possible to improve the productivity of the motor.

Various and advantageous advantages and effects of the embodiments are not limited to the above, and will be more easily understood in the course of describing specific embodiments of the embodiments.

1 is a view showing a motor according to an embodiment,
2 is a perspective view showing a rotor and a shaft disposed in the motor according to the embodiment;
3 is an exploded perspective view showing a rotor and a shaft disposed in the motor according to the embodiment;
4 is a bottom exploded perspective view showing a rotor and a shaft disposed in the motor according to the embodiment;
5 is a cross-sectional view showing a rotor and a shaft disposed in the motor according to the embodiment,
6 is a perspective view showing a unit rotor of a rotor disposed in a motor according to the embodiment;
7 is an exploded perspective view showing a unit rotor of a rotor disposed in a motor according to an embodiment;
8 is a cross-sectional view illustrating a unit rotor of a rotor disposed in a motor according to an embodiment.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

However, the technical spirit of the present invention is not limited to some embodiments described, but may be implemented in various different forms, and within the scope of the technical spirit of the present invention, one or more of the components may be selected between the embodiments. It can be combined and substituted for use.

In addition, terms (including technical and scientific terms) used in the embodiments of the present invention may be generally understood by those of ordinary skill in the art to which the present invention belongs, unless specifically defined and described explicitly. It may be interpreted as a meaning, and generally used terms such as terms defined in advance may be interpreted in consideration of the contextual meaning of the related art.

In addition, the terminology used in the embodiments of the present invention is for describing the embodiments and is not intended to limit the present invention.

In the present specification, the singular form may also include the plural form unless otherwise specified in the phrase, and when it is described as "at least one (or more than one) of A and (and) B, C", it is combined as A, B, C It may include one or more of all possible combinations.

In addition, in describing the components of the embodiment of the present invention, terms such as first, second, A, B, (a), (b), etc. may be used.

These terms are only for distinguishing the component from other components, and are not limited to the essence, order, or order of the component by the term.

And, when it is described that a component is 'connected', 'coupled' or 'connected' to another component, the component is not only directly connected, coupled or connected to the other component, but also with the component It may also include a case of 'connected', 'coupled' or 'connected' due to another element between the other elements.

In addition, when it is described as being formed or disposed on "above (above) or under (below)" of each component, top (above) or under (below) is one as well as when two components are in direct contact with each other. Also includes a case in which another component as described above is formed or disposed between two components. In addition, when expressed as "upper (upper) or lower (lower)", the meaning of not only an upper direction but also a lower direction based on one component may be included.

Hereinafter, the embodiment will be described in detail with reference to the accompanying drawings, but the same or corresponding components are given the same reference numerals regardless of reference numerals, and overlapping descriptions thereof will be omitted.

1 is a view showing a motor according to an embodiment, FIG. 2 is a perspective view showing a rotor and a shaft disposed in the motor according to an embodiment, and FIG. 3 is an exploded perspective view showing a rotor and a shaft disposed in the motor according to the embodiment 4 is a bottom exploded perspective view showing the rotor and the shaft disposed in the motor according to the embodiment, Figure 5 is a cross-sectional view showing the rotor and the shaft disposed in the motor according to the embodiment. 1 and 3 , the x direction may mean a radial direction, and the y direction may mean an axial direction. In addition, the axial direction and the radial direction may be perpendicular to each other. Here, the axial direction may be a longitudinal direction of the shaft 500 . In addition, reference numeral 'C' may indicate a rotation center of the motor.

Referring to FIG. 1 , the motor according to the embodiment includes a housing 100 having an opening formed on one side, a cover 200 disposed on an upper portion of the housing 100 , and a stator 300 disposed inside the housing 100 . ), a rotor 400 disposed inside the stator 300 , and a shaft 500 coupled to the rotor 400 . Here, the inner side may mean a direction disposed toward the rotation center C of the motor with respect to the radial direction, and the outer side may mean a direction opposite to the inner side.

In addition, the motor may include a bus bar 600 disposed above the stator 300 and a sensor unit 700 for detecting rotation of the rotor 400 .

The housing 100 and the cover 200 may form the external shape of the motor. In addition, an accommodation space may be formed therein by coupling the housing 100 and the cover 200 . Accordingly, the stator 300 , the rotor 400 , the shaft 500 , the bus bar 600 , and the sensor unit 700 may be disposed in the accommodation space.

At this time, the shaft 500 is rotatably disposed in the receiving space. Accordingly, the motor may further include bearings B respectively disposed on the upper and lower portions of the shaft 500 . Here, the bearing B disposed in the housing 100 may be referred to as a first bearing, a housing bearing, or a lower bearing. In addition, the bearing B disposed on the cover 200 may be referred to as a second bearing, a cover bearing, or an upper bearing.

The housing 100 may be formed in a cylindrical shape. In addition, the housing 100 may accommodate the stator 300 , the rotor 400 , and the like therein. At this time, the shape or material of the housing 100 may be variously changed. For example, the housing 100 may be formed of a metal material that can withstand high temperatures well.

The housing 100 may include a pocket portion capable of accommodating the bearing B at the lower portion. Here, the pocket portion of the housing 100 may be referred to as a housing pocket portion.

The cover 200 may be disposed on an opening surface of the housing 100 , that is, an upper portion of the housing 100 to cover the opening of the housing 100 .

And, the cover 200 may include a pocket that can accommodate the bearing (B). Here, the pocket portion of the cover 200 may be referred to as a cover pocket portion.

The stator 300 induces electrical interaction with the rotor 400 to induce rotation of the rotor 400 .

The stator 300 may be disposed inside the housing 100 . In this case, the stator 300 may be supported on the inner circumferential surface of the housing 100 . In addition, the stator 300 may be disposed outside the rotor 400 . That is, the rotor 400 may be rotatably disposed inside the stator 300 .

Referring to FIG. 1 , the stator 300 may include a stator core 310 , an insulator 320 disposed on the stator core 310 , and a coil 330 wound around the insulator 320 .

A coil 330 forming a rotating magnetic field may be wound around the stator core 310 . Here, the stator core 310 may be formed of one core or may be formed by combining a plurality of divided cores.

The stator core 310 may be formed in a form in which a plurality of plates in the form of thin steel plates are stacked on each other, but is not limited thereto. For example, the stator core 310 may be formed as a single piece.

The stator core 310 may include a cylindrical yoke and a plurality of teeth protruding radially from the yoke.

The plurality of teeth may be disposed to be spaced apart from each other in a circumferential direction of the yoke. Accordingly, a slot, which is a space in which the coil 330 is wound, may be formed between the respective teeth.

Meanwhile, the teeth of the stator 300 may be disposed to have an air gap with the rotor 400 . Here, the air gap may be a distance between the tooth and the magnet 420 in the radial direction.

The insulator 320 insulates the stator core 310 and the coil 330 . Accordingly, the insulator 320 may be disposed between the stator core 310 and the coil 330 .

Accordingly, the coil 330 may be wound around the stator core 310 on which the insulator 320 is disposed.

The rotor 400 rotates through electrical interaction with the stator 300 . In this case, the rotor 400 may be rotatably disposed on the stator 300 .

1 to 5 , the rotor 400 may be formed by stacking a plurality of unit rotors 400A stacked in the axial direction. Accordingly, since the motor forms the rotor 400 using the single unit rotor 400A, productivity can be improved. Here, the unit rotor 400A may be referred to as a puck.

In addition, based on the axial direction, the unit rotor 400A may be divided into a first unit rotor 400Aa, a second unit rotor 400Ab, and a third unit rotor 400Ac. That is, the rotor 400 may be formed by stacking the first unit rotor 400Aa, the second unit rotor 400Ab, and the third unit rotor 400Ac in the axial direction. Here, the rotor 400 is formed using at least three unit rotors 400A as an example, but is not necessarily limited thereto. For example, it may be formed using four or more unit rotors 400A.

In addition, the rotor 400 may arrange a plurality of unit rotors 400A to be twisted at a predetermined angle based on the circumferential direction to form a skew angle between the unit rotors 400A. For example, by using the hole 414 formed in the rotor core body 411 of the unit rotor 400A, a plurality of unit rotors 400A are arranged to be twisted at a predetermined angle with respect to the circumferential direction. Skew type can be made with

6 is a perspective view showing a unit rotor of a rotor disposed in a motor according to an embodiment, FIG. 7 is an exploded perspective view showing a unit rotor of a rotor disposed in a motor according to an embodiment, and FIG. 8 is a motor according to the embodiment. It is sectional drawing which shows the unit rotor of the rotor to be arrange|positioned.

6 to 8 , the unit rotor 400A is disposed to cover a rotor core 410 , a plurality of magnets 420 disposed on an outer circumferential surface of the rotor core 410 , and the magnets 420 . It may include a can 430 that is. In this case, the magnets 420 may be disposed to be spaced apart from each other at predetermined intervals along the circumferential direction on the rotor core 410 with respect to the center C. In addition, the rotor core 410 and the magnet 420 , and the magnet 420 and the can 430 may be coupled to each other through an adhesive member.

The rotor core 410 may be implemented in a shape in which a plurality of plates in the form of thin steel plates are stacked or in the shape of a single cylinder. In this case, the rotor core 410 may be formed to have a predetermined length L1 in the axial direction. Here, the axial length L1 of the rotor core 410 may be referred to as a first length or an axial height.

6 to 8 , the rotor core 410 includes a cylindrical rotor core body 411, a plurality of guides 412 protruding outwardly from the outer circumferential surface of the rotor core body 411, and the It may include a hole 413 formed at the center (C) side of the rotor core body 411 , and a plurality of holes 414 formed in the rotor core body 411 in a circumferential direction.

The rotor core body 411 may be formed in a cylindrical shape, and a hole 413 through which the shaft 500 is coupled may be formed in the center C.

The guide 412 may be integrally formed with the rotor core body 411 .

The guide 412 may guide the arrangement of the magnet 420 . Accordingly, the magnet 420 may be disposed between the guides 412 in the circumferential direction. At this time, the magnet 420 may be supported by the guide 412 to prevent circumferential flow. Here, the guide 412 may be elongated on the outer peripheral surface of the rotor core body 411 along the axial direction.

The hole 414 may be formed in the rotor core body 411 to penetrate the rotor core body 411 in the axial direction. Here, a plurality of the holes 414 may be formed to be spaced apart from each other in the circumferential direction.

The hole 414 may be used when the unit rotors 400A of the rotor 400 are displaced at a predetermined angle so that a skew angle can be formed between the unit rotors 400A. For example, a skew angle may be formed between the unit rotors 400A using a device such as a jig inserted into the hole 414 .

The magnet 420 forms a rotating magnetic field with the coil 330 wound around the stator core 310 of the stator 300 .

Accordingly, the rotor 400 rotates due to the electrical interaction between the coil 330 and the magnet 420 , and the shaft 500 rotates in conjunction with the rotation of the rotor 400 , thereby generating the driving force of the motor.

The magnet 420 may be disposed outside the rotor core 410 to implement a surface permanent magnet (SPM) type unit rotor 400A.

Based on the radial direction, the magnet 420 may be disposed between the outer peripheral surface of the rotor core body 411 and the can 430 . In addition, the magnet 420 may be guided by the guide 412 .

Meanwhile, the magnet 420 may be formed to have a predetermined length L2 in the axial direction. Here, the axial length L2 of the magnet 420 may be referred to as a second length. In addition, the axial length L2 of the magnet 420 is smaller than the axial length L1 of the rotor core 410 .

The can 430 may protect the rotor core 410 and the magnet 420 from physical or chemical stimuli. Also, the can 430 may prevent the magnet 420 from being separated from the rotor core 410 . Here, the can 430 may be disposed to cover a portion of the magnet 420 .

The can 430 may include a body 431 disposed outside the magnet 420 , and a plate portion 432 extending radially inward from one end of the body 431 . Here, the body 431 and the plate part 432 may be integrally formed. For example, the plate part 432 may be formed by bending one end of the body 431 .

The body 431 may be disposed outside the rotor core 410 . In addition, a portion of the inner surface of the body 431 may be disposed in contact with the magnet 420 .

The body 431 may be formed in a pipe shape.

The plate part 432 may extend only from one end of the body 431 . Accordingly, the vertical cross-section of the can 430 may be formed in a 'L' shape.

Also, the plate part 432 may be in contact with one surface of the magnet 420 in the axial direction. For example, a lower surface of the plate part 432 may be in contact with one surface in the axial direction of the magnet 420 . That is, the plate portion 432 disposed in one unit rotor 400A and one axial surface of the magnet 420 may contact each other. Accordingly, in one of the unit rotors 400A, one axial surface of the magnet 420 may contact the plate portion 432 , and the other surface of the magnet 420 may be exposed from the can 430 . .

In addition, the inner peripheral surface 432a of the plate part 432 may contact the guide 412 as shown in FIG. 2 . Accordingly, the plate portion 432 may be disposed to overlap an outer partial region of the magnet 420 in the axial direction. Also, the plate portion 432 is disposed so as not to overlap the rotor core 410 in the axial direction.

Meanwhile, the can 430 may be formed to have a predetermined length L3 in the axial direction. In this case, the can 430 may be formed to have a predetermined thickness t. Here, the axial length L3 of the can 430 may be referred to as a third length.

Here, the thickness t of the can 430 may be smaller than the difference L1-L2 between the axial length L1 of the rotor core 410 and the axial length L2 of the magnet 420 . . For example, the difference L1-L2 may be 0.02 mm. Here, the difference L1-L2 may be referred to as an offset.

And, based on the lower surface of the rotor core 410 , the axial length L3 of the can 430 is smaller than the axial length L1 of the rotor core 410 , and the axial length of the magnet 420 is It may be greater than the length L2. In this case, the axial length L3 of the can 430 may be the same as the axial length L1 of the rotor core 410 , but considering the assembly tolerance, the axial length L3 of the can 430 . ) is preferably formed to be smaller than the axial length L1 of the rotor core 410 .

Accordingly, between the magnets 420 of one unit rotor 400A and the magnets 420 of the other unit rotor 400A, which are arranged adjacent to each other in the axial direction among the plurality of unit rotors 400A, adjacent to each other. The plate part 432 of any one of the arranged unit rotors 400A may be disposed.

In addition, a space may be formed between the plate portion 432 of any one unit rotor 400A and the magnets 420 of the unit rotor 400A disposed adjacent to each other in the axial direction. As shown in FIG. 5, the plate portion 432 of one unit rotor 400A has a predetermined spacing G with the magnets 420 of the other unit rotor 400A disposed adjacent to each other in the axial direction. can be arranged to have. For example, the lower surface of the magnet 420 of the first unit rotor 400Aa may be disposed to have a predetermined spacing G from the plate portion 432 of the second unit rotor 400Ab. In this case, the lower surface of the magnet 420 of the first unit rotor 400Aa may be disposed to face the plate portion 432 of the second unit rotor 400Ab in the axial direction.

In addition, the magnet 420 of one unit rotor 400A and the magnet 420 of the other unit rotor 400A disposed adjacent to each other in the axial direction among the plurality of unit rotors 400A may contact each other. have. As shown in FIG. 5 , the magnet 420 of one unit rotor 400A may be disposed in contact with the magnet 420 of another unit rotor 400A disposed adjacent to each other in the axial direction. For example, the lower surface of the magnet 420 of the second unit rotor 400Ab may contact the upper surface of the magnet 420 of the third unit rotor 400Ac. Accordingly, the lower surface of the magnet 420 of the second unit rotor 400Ab may be disposed to face the upper surface of the magnet 420 of the third unit rotor 400Ac.

On the other hand, when forming the rotor 400 by stacking a single unit rotor 400A in the axial direction, in order to maximally protect the magnet 420 disposed inside the rotor 400, the first unit rotor (400Aa) and the third unit rotor (400Ac) may be arranged symmetrically to each other.

For example, when the second unit rotor 400Ab is disposed between the first unit rotor 400Aa and the third unit rotor 400Ac, the plate portion 432 of the first unit rotor 400Aa in the axial direction is By positioning the upper portion and the plate portion 432 of the third unit rotor 400Ac at the lower portion, the magnets 420 disposed in each unit rotor 400A can be maximally protected.

In addition, since the rotor 400 press-fits each unit rotor 400A into the shaft 500 after manufacturing a single unitary rotor 400A in advance, productivity can be improved.

In the conventional method, after assembling the rotor core 410 by press-fitting the shaft 500 , the magnet 420 is attached to the rotor core 410 through a bonding process using an adhesive member. And, a predetermined time is required until the adhesive member is cured (curing process of the adhesive member). Then, the can 430 is bonded to the magnet 420 using an adhesive member. Even at this time, since the curing process for the adhesive member must be accompanied, there is a problem in that the production time is further increased.

However, in the rotor 400 according to the embodiment, since one single unit rotor 400A is manufactured in advance and press-fitted, the production time can be reduced. Accordingly, the productivity of the motor can be improved.

The shaft 500 may be rotatably disposed inside the housing 100 by the bearing B. In addition, the shaft 500 may rotate together in conjunction with the rotation of the rotor 400 .

In addition, the shaft 500 may be coupled to the hole 413 formed in the center of the rotor core 410 in a press-fit manner.

Here, the rotor 400 to which the shaft 500 is coupled may be referred to as a shaft assembly or a rotor assembly. Accordingly, the shaft assembly can be provided for assembly of the motor as a single piece.

The bus bar 600 may be disposed on the stator 300 .

In addition, the bus bar 600 may be electrically connected to the coil 330 of the stator 300 .

The bus bar 600 may include a bus bar body (not shown) and a plurality of terminals (not shown) disposed inside the bus bar body. Here, the bus bar body may be a mold formed through injection molding. In addition, each of the terminals may be electrically connected to the coil 330 of the stator 300 .

The sensor unit 700 detects the magnetic force of the sensing magnet installed to be rotationally interlocked with the rotor 400 to detect the current position of the rotor 400 to detect the rotation of the shaft 500 .

The sensor unit 700 may include a sensing magnet assembly 710 and a printed circuit board (PCB, 720).

The sensing magnet assembly 710 is coupled to the shaft 500 to interwork with the rotor 400 to detect the position of the rotor 400 . In this case, the sensing magnet assembly 710 may include a sensing magnet and a sensing plate.

The sensing magnet may include a main magnet disposed in a circumferential direction adjacent to a hole forming an inner circumferential surface and a sub magnet formed at an edge thereof.

The main magnet may be arranged in the same manner as the drive magnet inserted into the rotor 400 of the motor.

The sub-magnet may be formed to have more poles than the main magnet. Accordingly, the sub-magnet makes it possible to divide and measure the rotation angle more precisely, and it is possible to induce the motor to be driven more smoothly.

The sensing plate may be formed of a metal material in the form of a disk. A sensing magnet may be coupled to the upper surface of the sensing plate. And the sensing plate may be coupled to the shaft 500 . Here, a hole through which the shaft 500 passes may be formed in the sensing plate.

A sensor for detecting the magnetic force of the sensing magnet may be disposed on the printed circuit board 720 . Here, the sensor may be provided as a Hall IC. In addition, the sensor may generate a sensing signal by detecting a change in the N pole and the S pole of the sensing magnet. Accordingly, the printed circuit board 720 on which the Hall IC is disposed may be referred to as a sensing assembly or a position sensing device.

Although the above has been described with reference to the preferred embodiment of the present invention, those skilled in the art can variously modify and change the present invention within the scope without departing from the spirit and scope of the present invention as described in the claims below. You will understand that it can be done.

1: motor
100: housing 200: cover
300: stator 310: stator core
330: coil
400: rotor
400A: unit rotor 400Aa: first unit rotor
400Ab: second unit rotor 400Ac: third unit rotor
410: rotor core 412: rotor core body
412: guide
420: magnet
430: can
431: body 432: plate portion
500: shaft
600: bus bar
700: sensor unit

Claims (11)

stator;
a rotor formed of a plurality of unit rotors; and
and a shaft coupled to the rotor;
The unit rotor includes a rotor core coupled to the shaft, a plurality of magnets disposed outside the rotor core, and a can disposed to cover the magnets,
The can motor includes a pipe-shaped body and a plate portion extending radially from only one of the ends of the body. According to claim 1,
Based on the lower surface of the rotor core, the axial length (L3) of the body is smaller than the axial length (L1) of the rotor core, and greater than the axial length (L2) of the magnet. 3. The method of claim 2,
The thickness t of the can is smaller than a difference (L1-L2) between the axial length L1 of the rotor core and the axial length L2 of the magnet. 3. The method of claim 2,
A motor in which any one plate part of the adjacent unit rotors is disposed between the magnets of one unit rotor disposed adjacent to each other in the axial direction and the magnets of the other unit rotors. 3. The method of claim 2,
When the plate portion of any one of the adjacent unit rotors is disposed between the magnets of any one unit rotor disposed adjacent to each other in the axial direction and the magnets of the other unit rotors,
A motor having a predetermined separation distance (G) from the magnets of the other unit rotors of the plate portion of any one of the unit rotors. 3. The method of claim 2,
A motor in which a magnet of any one of the unit rotors disposed adjacent to each other in the axial direction is in contact with a magnet of another unit rotor. According to claim 1,
The rotor core includes a rotor core body, and a guide projecting radially from an outer circumferential surface of the rotor core body,
The outer surface of the guide is in contact with the inner peripheral surface of the plate part motor. According to claim 1,
The plate portion disposed on one of the unit rotors and the axial surface of the magnet are in contact with each other. stator;
a rotor disposed to correspond to the stator; and
and a shaft coupled to the rotor;
The rotor includes a first unit rotor, a second unit rotor disposed under the first unit rotor, and a third unit rotor disposed under the second unit rotor,
Each of the first unit rotor, the second unit rotor, and the third unit rotor includes a rotor core coupled to the shaft, a plurality of magnets disposed outside the rotor core, and a can disposed to cover the magnets. including,
The can comprises a pipe-shaped body and a plate portion extending radially from only one of the ends of the body,
The plate portion of the can disposed on the second unit rotor is disposed to face a lower surface of the magnet disposed on the first unit rotor,
A lower surface of the magnet disposed on the second unit rotor is disposed to face an upper surface of the magnet disposed on the third unit rotor. 10. The method of claim 9,
An axial space is formed between the lower surface of the magnet disposed on the first unit rotor and the plate portion of the can disposed on the second unit rotor,
A lower surface of the magnet disposed on the second unit rotor and an upper surface of the magnet disposed on the third unit rotor are in contact with each other. It is formed of a plurality of unit rotors arranged in the axial direction,
The unit rotor includes a rotor core, a plurality of magnets disposed along an outer circumferential surface of the rotor core, and a can disposed to cover the magnets,
The can includes a pipe-shaped body and a plate portion extending radially from only one of the ends of the body,
In one of the unit rotors, one axial surface of the magnet is in contact with the plate portion, and the other axial surface is exposed from the can.

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