KR102566888B1 - Sensing stator and motor having the same - Google Patents

Abstract

The embodiment includes a plate comprising a protrusion; a magnet disposed on the plate; and an adhesive member disposed between the plate and the magnet to fix the magnet to the plate, wherein the magnet includes a ring-shaped magnet body and a coupling portion protruding inward from an inner circumferential surface of the magnet body. It relates to a sensing magnet assembly and a motor in which the protrusion is disposed inside the hole formed in the coupling part.

Description

Sensing magnet assembly and a motor including the same

The embodiment relates to a sensing magnet assembly 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, household electronic products, and industrial equipment.

The motor may include a housing, a shaft, a stator disposed inside the housing, and a rotor installed on an outer circumferential surface of the shaft. Here, the stator of the motor induces an electrical interaction with the rotor to induce rotation of the rotor. And, the shaft also rotates according to the rotation of the rotor.

The sensing magnet assembly disposed in the motor is installed to rotate in conjunction with the rotor, and induces a magnetic element to detect the position of the rotor through a magnetic field of a magnet included in the sensing magnet assembly.

This sensing magnet assembly includes a disk-shaped plate and a magnet coupled to the plate. Typically, the sensing magnet assembly is implemented in a form in which a magnet is coupled to an upper surface of a plate.

For example, the magnet is attached to the plate through an adhesive disposed between the plate and the magnet.

However, when attaching the magnet, there is a problem in that the magnet is attached to a predetermined position because there is no structure to hold the magnet.

In addition, when the center of gravity of the plate and the magnet are shifted, vibration and noise increase due to the magnet disposed eccentrically with respect to the plate.

Also, the eccentrically disposed magnet may be separated from the plate due to rotation.

Furthermore, when the motor is used in an electronic power steering system (EPS), the above-described problem may cause a fatal problem in safe driving of a vehicle. Inventions related to this include Patent Publication No. 10-2013-0012445 (February 4, 2013), Japanese Unexamined Patent Publication No. 2008-253121 (October 16, 2008), and Patent Registration No. 10-1332151 (November 2013). 26.).

Embodiments provide a motor that prevents separation of a magnet using a protrusion.

In addition, a motor preventing the magnet from being unbalancedly attached to the plate using the protrusion is provided.

The problem to be solved by the present invention is not limited to the above-mentioned problems, and other problems not mentioned herein will be clearly understood by those skilled in the art from the following description.

According to the embodiment, the problem is a plate including a protrusion; a magnet disposed on the plate; and an adhesive member disposed between the plate and the magnet to fix the magnet to the plate, wherein the magnet includes a ring-shaped magnet body and a coupling portion protruding inward from an inner circumferential surface of the magnet body, The inside of the hole formed in is achieved by the sensing magnet assembly in which the protrusion is disposed.

And, the protrusion is a body formed with a groove in the center; and a cutout formed on a side surface of the body, and the cutout may communicate with the groove.

In addition, the inclined surface of the protrusion may be formed to be inclined at a predetermined angle with respect to the upper surface of the plate. That is, the protrusion may include an inclined surface formed by the cutout, and an angle formed between an upper surface of the plate and the inclined surface may be an acute angle.

The protrusion may include two inclined surfaces formed by the cutout, and a distance between the inclined surfaces may increase upwardly.

In addition, the cutout portion may be disposed to face an inner circumferential surface of the magnet body.

Meanwhile, the protrusions may extend upward from the upper surface of the plate and may be disposed in plurality at predetermined intervals along the circumferential direction.

In addition, the protrusion may further include a chamfered surface formed at an upper end.

According to the embodiment, the task is a housing; a stator disposed within the housing; a rotor disposed within the stator; a shaft coupled to the rotor; a sensing magnet assembly disposed above the rotor; and a sensor unit disposed above the sensing magnet assembly, wherein the sensing magnet assembly includes a plate including protrusions, a magnet disposed on the plate, and disposed between the plate and the magnet to fix the magnet to the plate. The magnet includes a ring-shaped magnet body and a coupling portion protruding inward from an inner circumferential surface of the magnet body, and the protrusion is disposed inside a hole formed in the magnet. It is achieved by a motor.

The motor according to the embodiment can prevent the separation of the magnet by using the coupling between the hole formed in the magnet and the protrusion of the plate. That is, the coupling of the hole and the protrusion may be a reinforcing structure that prevents separation of the magnet together with an adhesive member.

In addition, the motor may allow the magnet to be disposed at a predetermined position of the plate by coupling a hole formed in the magnet to the protrusion of the plate. Accordingly, since the combination of the hole and the protrusion can prevent the magnet from being eccentrically disposed with respect to the plate, vibration and noise of the motor can be minimized.

1 is a view showing a motor according to an embodiment,
2 is a perspective view showing a sensing magnet assembly according to a first embodiment;
3 is an exploded perspective view showing the sensing magnet assembly according to the first embodiment;
4 is a plan view showing a plate of the sensing magnet assembly according to the first embodiment;
5 is a perspective view showing a sensing magnet assembly according to a second embodiment;
6 is an exploded perspective view showing a sensing magnet assembly according to a second embodiment;
7 is a plan view illustrating a plate of a sensing magnet assembly according to a second embodiment;
8 is a side view illustrating a plate of a sensing magnet assembly according to a second embodiment.

Since the present invention can make various changes and have various embodiments, specific embodiments are illustrated and described in the drawings. However, this is not intended to limit the present invention to specific embodiments, and 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. These terms are only used for the purpose of distinguishing one component from another. For example, a second element may be termed a first element, and similarly, a first element may be termed a second element, without departing from the scope of the present invention. The terms and/or include any combination of a plurality of related recited items or any of a plurality of related recited items.

It is 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, but other elements may exist in the middle. It should be. On the other hand, when an element is referred to as “directly connected” or “directly connected” to another element, it should be understood that no other element exists in the middle.

In the description of the embodiment, in the case where one component is described as being formed “on or under” another component, the upper (above) or lower (below) (on or under) includes both those formed by direct contact between two components or by indirectly placing one or more other components between the two components. In addition, when expressed as 'on or under', it may include the meaning of not only the upward direction but also the downward direction based on one component.

Terms used in this application are only used to describe specific embodiments, and are not intended to limit the present invention. Singular expressions include plural expressions unless the context clearly dictates otherwise. In this application, the terms "include" or "have" are intended to designate that there is a feature, number, step, operation, component, part, or combination thereof described in the specification, but one or more other features It should be understood that the presence or addition of numbers, steps, operations, components, parts, or combinations thereof is not precluded.

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 to which the present invention belongs. Terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with the meaning in the context of the related art, and unless explicitly defined in this application, it should not be interpreted in an ideal or excessively formal meaning. don't

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

1 is a view showing a motor according to an embodiment. In FIG. 1 , the y direction denotes an axial direction, and the x direction denotes a radial direction. And, the axial direction and the radial direction are perpendicular to each other.

Referring to FIG. 1, the motor 1 according to the embodiment includes a housing 100 having an opening on one side, a cover 200 disposed on top of the housing 100, and a stator disposed inside the housing 100 ( 300), the rotor 400 disposed inside the stator 300, the shaft 500 rotating together with the rotor 400, the bus bar 600 disposed above the stator 300, the rotor 400, and It may include a sensor unit 700 that detects rotation of the shaft 500 and sensing magnet assemblies 800 and 800a according to the embodiment. Here, the inner side means a direction disposed toward the center C based on the radial direction, and the outer side means a direction opposite to the inner side.

Such, the motor 1 may be a motor used in EPS. The EPS (Electronic Power Steering System) assists the steering force with the driving force of the motor to ensure turning stability and provides a quick restoring force so that the driver can drive safely.

The housing 100 and the cover 200 may form the exterior of the motor 1 . Also, an accommodation space may be formed by combining the housing 100 and the cover 200 . Accordingly, in the accommodation space, as shown in FIG. 1, the stator 300, the rotor 400, the shaft 500, the bus bar 600, the sensor unit 700, and the sensing magnet assemblies 800 and 800a ) and the like can be placed. At this time, the shaft 500 is rotatably disposed in the accommodation space. Accordingly, the motor 1 may further include bearings 10 respectively disposed above and below the shaft 500 .

The housing 100 may be formed in a cylindrical shape. At this time, the shape or material of the housing 100 may be variously modified. For example, the housing 100 may be formed of a metal material that can withstand high temperatures.

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.

The stator 300 may be accommodated inside the housing 100 . And, the stator 300 causes an electrical interaction with the rotor 400. At this time, the stator 300 may be disposed outside the rotor 400 based on the radial direction.

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.

The stator core 310 may be an integral core or a core in which a plurality of split cores are combined. For example, the stator core 310 may be implemented in a shape in which a plurality of plates in the form of circular thin steel plates are stacked or may be implemented in a single cylinder shape.

The insulator 320 may be disposed on the stator core 310 to insulate the stator core 310 and the coil 330. Here, the insulator 320 may be formed of a resin material.

The coil 330 may be wound around the insulator 320 . Also, the coil 330 may form a rotating magnetic field by supplying power.

Here, an end of the coil 330 wound around the insulator 320 may be disposed to be exposed upward. Also, an end of the coil 330 may be coupled to the bus bar 600 .

The rotor 400 may be disposed inside the stator 300, and the shaft 500 may be coupled to the center. Here, the rotor 400 may be rotatably disposed on the stator 300 .

The rotor 400 may include a rotor core and a magnet. The rotor core may be implemented in a shape in which a plurality of plates in the form of circular thin steel plates are stacked or in the form of a single cylinder. A hole to which the shaft 500 is coupled may be formed in the center of the rotor core. A protrusion for guiding the magnet may protrude from an outer circumferential surface of the rotor core. The magnet may be attached to an outer circumferential surface of the rotor core. A plurality of magnets may be disposed along the circumference of the rotor core at regular intervals. Also, the rotor 400 may be of a type in which a magnet is inserted into a pocket of a rotor core.

Accordingly, the rotor 400 rotates due to the electrical interaction between the coil 330 and the magnet, and when the rotor 400 rotates, the shaft 500 rotates to generate driving force.

Meanwhile, the rotor 400 may further include a can member disposed to surround the magnet. The can member fixes the magnet so that it does not separate from the rotor core. Also, the can member may prevent the magnet from being exposed to the outside.

The shaft 500 may be rotatably disposed inside the housing 100 by the bearing 10 .

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

Also, 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 and a terminal disposed inside the bus bar body. Here, the bus bar body may be a molded product formed through injection molding. Also, one side of the terminal may be electrically connected to the coil 330 .

The sensor unit 700 detects the magnetic force of the sensing magnet assemblies 800 and 800a installed to be rotatably interlocked with the rotor 400 to determine the current position of the rotor 400, thereby detecting the rotation of the shaft 500. there is.

The sensor unit 700 may be disposed above the sensing magnet assemblies 800 and 800a.

The sensor unit 700 may include a printed circuit board (PCB, not shown) and a sensor (not shown).

The sensor may be disposed on the printed circuit board. The sensor senses the magnetic force of the magnets disposed in the sensing magnet assemblies 800 and 800a. In this case, 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 magnets disposed in the sensing magnet assemblies 800 and 800a.

2 is a perspective view showing a sensing magnet assembly according to the first embodiment, FIG. 3 is an exploded perspective view showing the sensing magnet assembly according to the first embodiment, and FIG. 4 is a plate of the sensing magnet assembly according to the first embodiment. It is a plan view.

Referring to FIGS. 2 to 4 , the sensing magnet assembly 800 according to the first embodiment may include a magnet 810 , an adhesive member 820 and a plate 830 . Here, the plate 830 of the sensing magnet assembly 800 according to the first embodiment may be referred to as a first plate.

The magnet 810 may be disposed above the plate 830 . Also, the magnet 810 may be fixed to the top of the plate 830 by the adhesive member 820 .

The magnet 810 rotates as the plate 830 rotates in conjunction with the shaft 500 . At this time, the magnet 810 may be disposed to be spaced apart from the sensor of the sensor unit 700 . Accordingly, the sensor may detect a change in magnetic flux of the magnet 810 and calculate a rotation angle of the rotor 400 .

The magnet 810 may include a ring-shaped magnet body 811 and a coupling portion 812 protruding inward from the inner circumferential surface 811c of the magnet body 811 . Here, a hole 813 penetrating in an axial direction may be formed in the coupling part 812 .

The magnet body 811 may be formed in a ring shape. Also, the magnet body 811 may include a main magnet 811a disposed at the center and a sub magnet 811b disposed at the edge.

The main magnet 811a may be formed in a ring shape. In this case, the main magnet 811a may be provided as a plurality of divided magnets. When the main magnet 811a is formed as a split magnet, the number (number of poles) of the split magnets is the same as the number (number of poles) of the magnets disposed on the rotor 400, so that rotation of the rotor can be detected. can

The sub magnet 811b is disposed outside the main magnet 811a and may include a greater number (number of poles) than the main magnet 811a. Accordingly, one pole (division magnet) of the main magnet 811a is further subdivided and disassembled. Therefore, detection of the amount of rotation of the rotor 400 can be more precisely measured. A non-magnetic dummy area may be formed between the main magnet 811a and the sub-magnet 811b, and accordingly, the main magnet 811a and the sub-magnet 811b may be formed to be spaced apart by the width of the dummy area. .

Meanwhile, ferrite rubber may be used as the main magnet 811a and the sub magnet 811b.

The coupling portion 812 may protrude inward from the inner circumferential surface 811c of the magnet body 811 . The coupling portion 812 may be provided in a plate shape, and may be formed in a semicircular or sectoral shape on a plane.

The hole 813 may be formed in the coupling part 812 . Here, the hole 813 may be formed to pass through the coupling part 812 in the axial direction.

As shown in FIGS. 2 and 3 , the hole 813 is spaced apart from the inner circumferential surface 811c of the magnet body 811 at a predetermined distance as an example, but is not necessarily limited thereto. For example, the hole 813 may be formed to come into contact with the inner circumferential surface 811c of the magnet body 811 .

The adhesive member 820 fixes the magnet 810 to the plate 830 .

As shown in FIG. 3 , the adhesive member 820 may be formed in a ring shape.

The adhesive member 820 is disposed between the magnet 810 and the plate 830 . In this case, an adhesive such as double-sided tape or bond may be used as the adhesive member 820 . In addition, one surface of the adhesive member 820 may be adhered or applied to the upper surface 831a of the plate 830 .

The plate 830 may be coupled to the shaft 500 . Accordingly, the plate 830 may rotate in conjunction with the rotation of the shaft 500 .

Referring to FIGS. 3 and 4 , the plate 830 may include a plate body 831 , a protrusion 832 , and a plurality of protrusions 833 protruding from the plate body 831 in an axial direction. Here, the plate 830 may be referred to as a sensing plate.

The plate body 831, the protrusion 832, and the protrusion 833 may be integrally formed. In this case, the plate 830 may be formed of an electroplated steel sheet.

The plate body 831 may be formed in a disk shape. At this time, the adhesive member 820 may be disposed on the upper surface 831a of the plate body 831 .

Also, the protruding portion 832 may protrude by extending in an axial direction from the center of the upper surface 831a.

The protrusion 832 may be formed in a cylindrical shape with a hole formed in the center. And, the shaft 500 may be disposed inside the protrusion 832 . At this time, since the shaft 500 is fitted inside the hole, the shaft 500 and the plate 830 can rotate integrally.

The protrusion 833 may protrude upward from the upper surface 831a of the plate body 831 . Here, the protrusion 833 may be formed in a cylindrical shape.

The protrusion 833 may be spaced apart from the outer circumferential surface of the protrusion 832 in a radial direction.

As shown in FIG. 4 , a plurality of protrusions 833 may be disposed at predetermined intervals d along the circumferential direction based on the center C of the plate 830 . At this time, three protrusions 833 are formed to be spaced apart at 120 degree intervals based on the center (C) as an example, but are not necessarily limited thereto.

The protrusion 833 may be disposed inside the hole 813 of the magnet 810 . Here, the protrusion 833 may be coupled to the hole 813 in a fitting manner. Accordingly, the magnet 810 may be disposed at a preset position of the plate 830 . That is, the coupling between the protrusion 833 of the plate 830 and the hole 813 of the magnet 810 prevents the magnet 810 from being eccentrically disposed on the plate 830 .

In addition, the combination of the hole 813 and the protrusion 833 prevents the magnet 810 from being separated from the plate 830 due to centrifugal force caused by rotation.

Meanwhile, the protrusion 833 may further include a chamfered surface 834 formed at an upper end.

The chamfered surface 834 may be formed by a chamfering operation of shaving the upper edge of the protrusion 833 . Accordingly, the protrusion 833 can be easily coupled to the hole 813 .

5 is a perspective view showing a sensing magnet assembly according to the second embodiment, FIG. 6 is an exploded perspective view showing the sensing magnet assembly according to the second embodiment, and FIG. 7 is a plate of the sensing magnet assembly according to the second embodiment. FIG. 8 is a side view illustrating a plate of the sensing magnet assembly according to the second embodiment.

In describing the sensing magnet assembly 800a according to the second embodiment with reference to FIGS. 5 to 8, components identical to those of the sensing magnet assembly 800 according to the first embodiment are denoted by the same reference numerals, A detailed description thereof will be omitted.

5 to 8 , a sensing magnet assembly 800a according to the second embodiment may include a magnet 810, an adhesive member 820, and a plate 830a. Here, the plate 830a of the sensing magnet assembly 800a according to the second embodiment may be referred to as a second plate.

The plate 830a of the sensing magnet assembly 800a may include a plate body 831, a protrusion 832, and a plurality of protrusions 833a protruding from the plate body 831 in an axial direction. In this case, the protrusion 833a may be disposed inside the hole 813 of the magnet 810 .

Referring to FIGS. 6 to 8 , the protrusion 833a may include a body 835 having a central groove 836 and a cutout 837 formed on a side surface of the body 835 . Also, the protrusion 833a may further include a chamfered surface 834 formed at an upper end thereof. Here, the cutout 837 may be called a spaced portion.

The protrusion 833a may protrude upward from the top surface 831a of the plate body 831 .

As shown in FIG. 7 , the protrusion 833a may be formed in a C-shape in plan view.

Accordingly, a groove 836 may be concavely formed at the center of the protrusion 833a. In addition, as one end and the other end of the protrusion 833a disposed in the circumferential direction are spaced apart by a predetermined width W, a cutout 837 may be formed between the one end and the other end. Here, the cutout 837 may be formed by cutting a portion of the side surface of the body 835 in which the groove 836 is formed. At this time, the cutout 837 may communicate with the groove 836 .

Referring to FIG. 7 , the cutout 837 may be disposed outward in a radial direction. Accordingly, the cutout 837 may be disposed to face the inner circumferential surface 811c of the magnet body 811 as shown in FIG. 5 . At this time, the hole 313 may be formed in the coupling part 312 so that the inner circumferential surface 811c of the magnet body 811 is exposed.

Accordingly, when the adhesive is provided with the adhesive member 820, the adhesive may move to the groove 836 through the cutout 837. Also, the adhesive may be hardened inside the groove 836 to improve bonding strength between the protrusion 833a and the hole 813 .

In addition, when the adhesive member 820 is provided as an adhesive tape, an air layer may be formed between the adhesive tape and the upper surface 831a of the plate body 831 or between the adhesive tape and the magnet 810 .

When the magnet 810 presses the other surface of the adhesive tape and is attached, the air in the air layer moves to the groove 836 through the cutout 837 and can escape to the outside. That is, the cutout 837 and the groove 836 serve as a passage through which the air can escape even when the coupling portion 812 protrudes inward from the plate body 831 . Accordingly, the magnet 810 may be firmly attached to the plate 830 .

Referring to FIG. 8 , the width W of the cutout 837 may increase toward the upper side. Since the width of the upper side of the cutout 837 is greater than that of the lower side, the upper side of the protrusion 833a has a larger contractable amount than the lower side. Thus, the protrusion 833a can be more easily coupled to the hole 813 .

As the width W of the cutout 837 increases toward the upper side, the protrusion 833a may include an inclined surface 838 . That is, the protrusion 833a may include an inclined surface 838 formed by the cutout 837 .

As shown in FIG. 8 , the inclined surface 838 may be inclined at a predetermined angle θ with respect to the upper surface 831a of the plate 830a. In this case, an angle θ between the upper surface 831a of the plate 830a and the inclined surface 838 may be an acute angle.

Also, the protrusion 833a includes two inclined surfaces 838 formed by the cutout 837, and a distance between the inclined surfaces 838 may increase upwardly.

In summary, when the sensing magnet assemblies 800 and 800a rotate, the coupling of the hole 813 and the protrusions 833 and 833a improves the balance and reliability of the sensing magnet assemblies 800 and 800a against rotation. can

Although the above has been described with reference to the embodiments of the present invention, those skilled in the art can variously modify and modify the present invention within the scope not departing from the spirit and scope of the present invention described in the claims below. You will understand that it can be changed. And, it should be construed that the differences related to these modifications and changes are included in the scope of the present invention, which is defined in the appended claims.

1: motor
10: bearing
100: housing
200: cover
300: stator
400: rotor
500: shaft
600: bus bar
700: sensor unit
800, 800a: sensing magnet assembly
810: magnet 813: hole
820: adhesive member
830, 830a: plate
831: plate body 832: coupling part
833, 833a: projection
834: chamfered surface
836 Groove 837 Incision
838: slope

Claims (8)

Plates containing protrusions;
a magnet disposed on the plate; and
An adhesive member disposed between the plate and the magnet to fix the magnet to the plate,
The magnet includes a ring-shaped magnet body and a coupling portion protruding inward from an inner circumferential surface of the magnet body,
The protrusion is disposed inside the hole formed in the magnet,
The protrusion includes a chamfered surface formed at the top,
The protrusion includes a body formed with a groove in the center and a cutout formed on a side surface of the body,
The sensing magnet assembly in which the cutout communicates with the groove. delete According to claim 1,
The protrusion includes an inclined surface formed by the cutout,
An angle between the upper surface of the plate and the inclined surface is an acute sensing magnet assembly. Plates containing protrusions;
a magnet disposed on the plate; and
An adhesive member disposed between the plate and the magnet to fix the magnet to the plate,
The magnet includes a ring-shaped magnet body and a coupling portion protruding inward from an inner circumferential surface of the magnet body,
The protrusion is disposed inside the hole formed in the magnet,
The protrusion includes a body formed with a groove in the center and a cutout formed on a side surface of the body,
The sensing magnet assembly in which the cutout communicating with the groove is disposed to face an inner circumferential surface of the magnet body. According to claim 3,
The projection includes two inclined surfaces formed by the cutout,
A sensing magnet assembly in which the distance between the inclined surfaces increases upward. According to claim 1,
The projections extend upward from the upper surface of the plate, and a plurality of sensing magnet assemblies are disposed spaced apart at predetermined intervals along the circumferential direction. delete housing;
a stator disposed within the housing;
a rotor disposed within the stator;
a shaft coupled to the rotor;
a sensing magnet assembly disposed above the rotor; and
A sensor unit disposed above the sensing magnet assembly,
The sensing magnet assembly is
a plate containing projections;
It includes a magnet disposed on the plate and an adhesive member disposed between the plate and the magnet to fix the magnet to the plate,
The magnet includes a ring-shaped magnet body and a coupling portion protruding inward from an inner circumferential surface of the magnet body,
The protrusion is disposed inside the hole formed in the magnet,
The motor comprising a chamfered surface formed on the top of the protrusion.

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