KR102466986B1 - Linear motor and a linear compressor using the same - Google Patents

Abstract

The invention manufactures a first stator part and a second stator part that form a magnetic field by sintering soft magnetic ferrite, and the first stator part has a first body and a second body located on opposite sides of the first coil part can include Alternatively, the first stator part may include an outer part installed in a ring shape and made by sintering soft magnetic ferrite, and an extension body part extending inwardly from the outer part and forming a block by stacking a plurality of iron plates. The second stator unit is located at the center of the first stator unit and may be a single member installed in a ring shape.

Description

Linear motor and linear compressor applying the same {LINEAR MOTOR AND A LINEAR COMPRESSOR USING THE SAME}

The present invention relates to a linear motor with improved motor efficiency and a linear compressor to which the same is applied.

In general, a compressor refers to a device configured to compress a working fluid such as air or refrigerant by receiving power from a power generating device such as a motor or a turbine. Compressors are widely used in industries, home appliances, and refrigeration cycles in vapor compression rooms.

Types of these compressors include a reciprocating compressor in which a compression chamber is formed between a piston and a cylinder and a piston linearly reciprocates to compress fluid, a rotary compressor to compress fluid by a roller rotating eccentrically inside the cylinder, and a spiral compressor. There is a scroll compressor in which a pair of scrolls are engaged and rotated to compress fluid.

Recently, among reciprocating compressors, a linear compressor employing a linear motor performing linear reciprocating motion without using a crankshaft has been developed. The linear compressor has the advantage of improving efficiency and having a simple structure because there is no mechanical loss associated with converting rotational motion into linear reciprocating motion.

In such a linear compressor, a cylinder is positioned inside a casing forming an airtight space to form a compression chamber, and a piston covering the compression chamber is configured to reciprocate inside the cylinder. That is, while the piston is moved to be located at the bottom dead center (BDC), the fluid in the closed space is sucked into the compression chamber. And while the piece phone is moved to be located at the top dead center (TDC), the process of compressing and discharging the fluid in the compression chamber is repeated.

On the other hand, a linear motor for driving the reciprocating motion of a piston is generally composed of a stator connected to a cylinder and wound with a coil, and a moving member connected to the piston and reciprocated. The stator forms a magnetic flux path by the current flowing through the coil.

That is, the linear motor includes a stator including an outer stator formed in a cylindrical shape and an inner stator formed in a cylindrical shape to be inserted into the outer stator, and a winding coil coupled to the outer stator or the inner stator, and the outer stator and the inner stator. Between the stators, a movable member is installed to be movable in a straight direction.

Conventionally, since iron plates are stacked radially to form an outer stator and an inner stator, when the frequency is increased due to high-speed operation, a lot of eddy current flows and heat is generated, so there is a problem in that motor efficiency is lowered. In addition, since the conventional outer stator and inner stator are formed by stacking a plurality of iron plates, the time required for manufacturing increases and the production cost increases due to the increase in the number of parts. Therefore, there is a need to improve this.

KR 10-1454550 B1 KR 10-2017-0004136 A

An object of the present invention is to provide a linear motor capable of reducing heat generation by reducing generation of eddy current when the frequency is increased due to high-speed operation.

Another object of the present invention is to provide a linear motor capable of reducing the time required for manufacturing and the number of parts compared to a structure in which a plurality of iron plates are laminated.

The objects of the present invention are not limited to the above-mentioned objects, and other objects and advantages of the present invention not mentioned above can be understood by the following description and will be more clearly understood by the examples of the present invention. It will also be readily apparent that the objects and advantages of the present invention may be realized by means of the instrumentalities and combinations indicated in the claims.

In an embodiment of the present invention, a first stator part and a second stator part for forming a magnetic field are manufactured by sintering soft magnetic ferrite.

The first stator unit may include a first body and a second body positioned on opposite sides of the first coil unit as a center.

The first stator unit may include an outer portion installed in a ring shape and made by sintering soft magnetic ferrite, and an extension body portion extending inwardly from the outer portion and forming a block by stacking a plurality of iron plates.

The second stator unit is located at the center of the first stator unit and may be a single member installed in a ring shape.

A linear motor according to the present invention includes a first stator portion having a hollow portion, installed along the circumferential direction, and changing magnetic poles by power supply, and a second stator portion facing the first stator portion and located inside the hollow portion and having magnetic force. It may include a stator unit and a movable member positioned between the first stator unit and the second stator unit and moved in a linear direction by a change in magnetic force.

Also, at least one of the first stator unit and the second stator unit may include ferrite powder.

Also, at least one of the first stator unit and the second stator unit may include soft ferrite powder.

In addition, the first stator unit includes a stator body located outside the moving member, extending along the circumferential direction and containing ferrite powder, and a first coil located inside the stator body and wound along the circumferential direction can do.

In addition, the stator body portion may be formed by sintering soft ferrite powder.

In addition, the stator body part surrounds the upper side of the first coil part and is installed at a position facing the first body with the first body and the first coil part extending in the circumferential direction interposed therebetween, and enclosing the lower part of the first coil part and extending along the circumferential direction. It may include a second body extending along the direction.

In addition, at least one of the first body and the second body may be formed by sintering soft ferrite powder.

In addition, the first stator part is installed along the circumferential direction from the outside of the moving member and includes an outer part containing ferrite powder, one side is connected to the outer part, and the other side extends toward the moving member and has an installation space inside and a second coil located inside the extension body and guiding the movement of current.

Also, the outer portion may be formed by sintering soft ferrite powder.

In addition, the extension body part is installed at a position facing the first block with the first block and the second coil part in between forming a block formed by stacking a plurality of iron plates and covering the upper side of the second coil part, and a plurality of The iron plates of are stacked to form a block and may include a second block surrounding the lower side of the first block.

In addition, the outer part is connected to the first block, surrounds the outside of the second coil part, and is installed in the circumferential direction, and one side faces the first outer and the other side is connected to the second block, and together with the first outer, the second outer part A second outer covering the outside of the coil unit and installed in a circumferential direction may be included.

Also, at least one of the first outer and the second outer may be formed by sintering soft ferrite powder.

In addition, the second stator unit may be located inside the movable member and extend along the circumferential direction.

Also, the second stator unit may be formed by sintering soft ferrite powder.

A linear compressor according to the present invention may include a cylinder having a bore, a piston inserted into the cylinder and linearly reciprocating in an axial direction, and a linear motor generating power for linear motion of the piston.

In the linear motor according to the present invention, since the first stator part and the second stator part installed in a ring shape are formed by sintering soft ferrite powder, generation of eddy current is reduced during operation in a high-frequency state to prevent heat generation. can be reduced and motor efficiency can be improved.

In addition, since the main components of the present invention are formed by sintering, the linear motor according to the present invention simplifies the assembly process by reducing the number of parts compared to the prior art, and improves productivity by reducing the time required for manufacturing.

In addition to the effects described above, specific effects of the present invention will be described together while explaining specific details for carrying out the present invention.

1 is a simplified side cross-sectional view of a linear compressor according to a first embodiment of the present invention.
2 is a perspective view showing a linear motor according to a first embodiment of the present invention.
3 is a plan view of a linear motor according to a first embodiment of the present invention.
4 is a cross-sectional side view of a linear motor according to a first embodiment of the present invention.
5 is a side cross-sectional view showing the movement of the moving member according to the first embodiment of the present invention.
6 is a diagram showing a state in which the iron loss of the linear motor and the conventional motor according to the first embodiment of the present invention changes as the frequency increases.
7 is a plan view of a linear motor according to a second embodiment of the present invention.
8 is a side cross-sectional view of a linear motor according to a second embodiment of the present invention.

The above objects, features and advantages will be described later in detail with reference to the accompanying drawings, and accordingly, those skilled in the art to which the present invention belongs will be able to easily implement the technical spirit of the present invention. In describing the present invention, if it is determined that the detailed description of the known technology related to the present invention may unnecessarily obscure the subject matter of the present invention, the detailed description will be omitted. Hereinafter, preferred embodiments according to the present invention will be described in detail with reference to the accompanying drawings. In the drawings, the same reference numerals are used to indicate the same or similar components.

Although first, second, etc. are used to describe various components, these components are not limited by these terms, of course. These terms are only used to distinguish one component from another component, and unless otherwise stated, the first component may be the second component, of course.

Hereinafter, the arrangement of an arbitrary element on the "upper (or lower)" or "upper (or lower)" of a component means that an arbitrary element is placed in contact with the upper (or lower) surface of the component. In addition, it may mean that other components may be interposed between the component and any component disposed on (or under) the component.

In addition, when a component is described as "connected", "coupled" or "connected" to another component, the components may be directly connected or connected to each other, but other components may be "interposed" between each component. ", or each component may be "connected", "coupled" or "connected" through other components.

Throughout the specification, unless otherwise stated, each element may be singular or plural.

Singular expressions used herein include plural expressions unless the context clearly dictates otherwise. In this application, terms such as "consisting of" or "comprising" should not be construed as necessarily including all of the various components or steps described in the specification, and some of the components or some of the steps It should be construed that it may not be included, or may further include additional components or steps.

Throughout the specification, when "A and/or B" is used, this means A, B or A and B unless otherwise specified, and when used as "C to D", this means unless otherwise specified As long as there is no, it means C or more and D or less.

Hereinafter, a linear compressor and a linear motor according to some embodiments of the present invention will be described.

[Structure of Linear Compressor]

1 is a cross-sectional side view showing a linear compressor 1 according to a first embodiment of the present invention.

Referring to FIG. 1, the overall structure of the linear compressor 1 according to the first embodiment of the present invention will be looked at. In the linear compressor 1, the piston 50 linearly reciprocates with respect to the cylinder 40. The space of the compression chamber 44 defined by the cylinder 40 and the piston 50 repeatedly increases and decreases in volume as the piston 50 rectilinearly reciprocates. In order to drive the linear reciprocating motion of the piston 50, a linear motor 60 is provided around the outer circumference of the cylinder 40. The linear motor 60 is provided between the first stator unit 70 and the second stator unit 90 and between the first stator unit 70 and the second stator unit 90, which have different diameters and are installed in an annular shape. It has a moving member 95 disposed on. The moving member 95 is connected to the piston 50 and linearly reciprocates integrally with the piston 50.

The linear compressor 1 according to the first embodiment of the present invention includes a cylinder 40 having a bore 42, a piston 50 inserted into the cylinder 40 and linearly reciprocating in the axial direction, and a piston ( 50) may include a linear motor 60 generating power for linear motion.

The above structure for compression of fluid is arranged inside the shell 10 . The inner space of the shell 10 is isolated from the outside by the shell 10 . The shell 10 of the embodiment includes a container-shaped body shell 11 open to the top, and a lead shell 12 covering the body shell 11 from the top of the body shell 11. The body shell 11 and the lead shell 12 may be manufactured, for example, by press-working sheet metal. An ear mount 13 for fixing the shell 10 is disposed on the bottom surface of the body shell 11 . An inlet pipe 14 is connected to the shell 10, and the refrigerant flows into the inner space of the shell 10 through the inlet pipe 14. The shape and assembly method of the shell 10 are not limited to the shell 10 of the embodiment.

A plurality of installation pins 15 protruding upward are provided at the bottom of the shell 10 . In addition, an elastic body 25 such as a coil spring is installed on each of the plurality of installation pins 15 . The frame 20 facing the cylinder 40, the piston 50, and the linear motor 60 described above is mounted on the elastic body 25 and installed. Accordingly, vibration generated while the piston 50 moves in a relatively linear reciprocating motion in the axial direction with respect to the cylinder 40 may not be transmitted to the shell 10 . The type and installation method of the elastic body 25 is not limited to the coil spring of the embodiment. For example, a leaf spring may be used, or a method of hanging the frame 20 on a wire may be used.

The frame 20 includes the cylinder 40 . The cylinder 40 may be integrally manufactured with the frame 20 . Being integrally manufactured includes a concept in which the cylinder 40 and the frame 20 are manufactured as one body by being assembled after being manufactured as different parts, or manufactured as one part from the beginning.

The cylinder 40 is a cylindrical structure arranged in the axial direction, the front side in the axial direction is covered with the discharge cover 46, and the rear side in the axial direction is open. A discharge valve (not shown) is installed in the discharge cover 46 to be opened by a pressure higher than a predetermined value. The compression chamber 44 is defined by the discharge cover 46, the bore 42 of the cylinder 40 and the head 54 of the piston 50.

The piston 50 includes a head 54, a flange 56 and a piston body 58. The head 54 is provided in the axial direction front of the piston 50 and faces the compression chamber 44 . The cross section of the head 54 corresponds to the internal cross section of the bore 42 of the cylinder 40 . A check valve (not shown) is installed in the head 54. The check valve allows the fluid in the space provided axially rearward from the head 54 to flow into the compression chamber 44, and allows the fluid in the compression chamber 44 to pass through the head 54 in the axial direction. It prevents back flow into the space provided at the rear.

The piston body 58 connected to the head 54 has a cylindrical shape, is located inside the bore 42 provided in the cylinder 40, and moves in a linear direction. One side of the piston body 58 is connected to the head 54 and the other side of the piston body 58 is connected to the flange 56.

The linear motor 60, which is a driving means for linearly reciprocating the piston 50, includes a first stator unit 70, a second stator unit 90, and a moving member 95. The first stator unit 70 and the second stator unit 90 may be fixed to the frame 20 . The second stator unit 90 is installed around the outer circumference of the cylinder 40, and the first stator unit 70 is spaced apart from the second stator in the radial direction.

The moving member 95 is disposed between the first stator unit 70 and the second stator unit 90 and can linearly reciprocate along the axial direction. A first coil unit 75 in which a coil is wound may be mounted on the first stator unit 70, and the moving member 95 may include a permanent magnet. When current is applied to the linear motor 60 , magnetic flux is formed between the first stator unit 70 and the second stator unit 90 by the first coil unit 75 . This magnetic flux interacts with the magnetic flux generated from the permanent magnet of the movable member 95, and accordingly, the movable member 95 can linearly reciprocate in the forward and backward directions.

The moving member 95 is fixed to the flange 56 of the piston 50. Therefore, the movable member 95 moves in the forward and backward directions together with the piston 50 .

Also, the piston 50 is connected to the resonance spring 26 . The resonance spring 26 is connected to the piston 50 through the flange 56 . The resonance spring 26 may include a first spring 27 and a second spring 28 that elastically press the piston 50 forward and backward, respectively. In the embodiment, a structure in which a compression coil spring is applied as the resonance spring 26 is exemplified. One end of the first spring 27 and the second spring 28 is supported by the frame 20, and the other end presses the piston 50. The resonance spring 26 amplifies the vibration of the linear reciprocating motion of the moving member 95 and the piston 50, so that the fluid is compressed more efficiently.

On the other hand, both sides of the linear motor 60 installed in the linear compressor 1 are pressed by the stator cover and the frame 20 . In addition, since the linear motor 60 serves as a pillar of the linear compressor 1, support strength higher than necessary is required.

[Operation of Linear Compressor]

The embodiment described below illustrates a low-pressure type compressor in which the internal space of the shell 10 forms a low pressure. However, the technical spirit of the present invention is not limited thereto.

When the linear motor 60 operates, the piston 50 linearly reciprocates in the axial direction. When the piston 50 moves backward, the volume of the compression chamber 44 increases, and the volume of the internal space of the shell 10 excluding the compression chamber 44 decreases. Accordingly, since the pressure of the fluid in the inner space of the compression chamber 44 is significantly lower than the pressure of the fluid in the inner space of the shell 10, the check valve of the piston 50 is opened, and the fluid in the inner space of the shell 10 ( For example, refrigerant) is introduced into the compression chamber 44 .

When the piston 50 moves forward, the volume of the compression chamber 44 decreases, and the volume of the internal space of the shell 10 excluding the compression chamber 44 increases. Accordingly, since the pressure of the fluid in the inner space of the compression chamber 44 is greater than the pressure of the fluid in the inner space of the shell 10, the check valve of the piston 50 is closed, and the fluid in the compression chamber 44 is the shell. It does not flow back into the internal space of (10). As the piston 50 moves forward, a fluid (refrigerant) is introduced into the shell 10 through the inlet pipe 14 by the amount of the increased internal volume of the shell 10 .

As the piston 50 moves forward, the fluid in the compression chamber 44 is compressed to a high pressure. When the pressure of the fluid exceeds a predetermined pressure, the high-pressure fluid is discharged through the discharge valve of the discharge cover 46 disposed in front of the compression chamber 44 of the cylinder 40 . The discharged high-pressure fluid is discharged to the outside of the shell 10 through the discharge port 47 and the discharge pipe (not shown).

In the refrigeration cycle, the inlet pipe 14 may be connected to an evaporator, and the discharge pipe may be connected to a condenser.

When the movable member 95 and the piston 50 move forward and backward, the resonance spring 26 amplifies the forward and backward movement of the piston 50 . Since the vibration generated as the piston 50 and related parts move back and forth is reduced by the elastic body 25, the vibration is hardly transmitted to the shell 10.

[Structure of Linear Motor - First Embodiment]

Figure 2 is a perspective view showing a linear motor 60 according to the first embodiment of the present invention, Figure 3 is a plan view of the linear motor 60 according to the first embodiment of the present invention, Figure 4 is a It is a cross-sectional side view of the linear motor 60 according to the first embodiment.

2 to 4, the linear compressor 1 according to the first embodiment of the present invention includes a shell 10, a frame 20, an elastic body 25, a cylinder 40, and a piston 50 ) and at least one of a linear motor. In addition, the linear motor 60 according to the first embodiment of the present invention may include a first stator unit 70, a second stator unit 90, and a moving member 95.

At least one of the first stator unit 70 and the second stator unit 90 may include ferrite powder. Only one of the first stator unit 70 and the second stator unit 90 according to the first embodiment of the present invention may be made of ferrite powder. Alternatively, various modifications are possible, such as that both the first stator unit 70 and the second stator unit 90 can be made of ferrite powder.

The ferrite powder may include at least one selected from hard ferrite and soft ferrite. At least one of the first stator unit 70 and the second stator unit 90 according to the first embodiment of the present invention may include soft ferrite powder.

Only one of the first stator unit 70 and the second stator unit 90 according to the first embodiment of the present invention may be made of soft magnetic ferrite powder. Alternatively, various modifications are possible, such as that both the first stator unit 70 and the second stator unit 90 can be made of soft magnetic ferrite powder.

In the case of soft magnetic ferrite, specifically, at least one of oxide soft magnetic ferrites such as Ni-Zn ferrite, Ni-Zn-Cu ferrite, Mn-Zn ferrite, Mg-Zn ferrite, and Ni-Mn-Zn ferrite. It may be, but is not particularly limited.

At least one of the first stator unit 70 and the second stator unit 90 may be manufactured by sintering soft magnetic ferrite powder. Only soft magnetic ferrite powder can be used, and a solvent and a binder may be added to the soft magnetic ferrite powder if necessary. Solvents and binders may be applied without particular limitation as long as they are components commonly used in the art.

The first stator part 70 has a hollow part 71 and is installed along the circumferential direction, and various modifications can be implemented within the technical idea that the magnetic pole is changed by power supply. The first stator unit 70 according to the first embodiment of the present invention is installed in a ring shape, and the second stator unit 90 and the moving member 95 are installed in the hollow part 71 of the first stator unit 70 is installed

The first stator part 70 may include a stator body part 72 and a first coil part 75 . The stator body 72 is located outside the movable member 95, extends along the circumferential direction and is installed in a ring shape. Also, the stator body 72 includes ferrite powder. The stator body 72 according to the first embodiment of the present invention may be formed by sintering soft ferrite powder. The stator body 72 is formed in a donut shape, and a space for installing the first coil unit 75 is provided on the inside. The stator body 72 may be made of a single member, or may be made of a plurality of members if necessary. When the stator body portion 72 is composed of a plurality of members, various modifications such as being connected to each other in a shape surrounding the outside of the first coil portion 75 and movement can be restricted, etc. are possible.

The stator body 72 according to the first embodiment of the present invention includes a first body 73 and a second body 74. The first body 73 extends in the circumferential direction while surrounding the upper side (hereinafter, referring to FIG. 4 ) of the first coil unit 75 . In addition, the first body 73 is located outside the first coil unit 75 and has a concave cross section toward the lower side where the first coil unit 75 is installed.

The second body 74 is installed at a position facing the first body 73 with the first coil unit 75 therebetween, and extends along the circumferential direction while wrapping the lower side of the first coil unit 75. Various modifications can be implemented within the idea. In addition, the second body 74 is located outside the first coil unit 75 and has a concave cross section toward the upper side where the first coil unit 75 is installed.

The first body 73 and the second body 74 may be installed symmetrically up and down around the first coil unit 75, and the first body 73 and the second body 74 are coupled to each other to An inner space for installing one coil unit 75 may be formed. In addition, the movement of the first body 73 and the second body 74 is restricted in a state in which the first coil unit 75 is wrapped around. Also, at least one of the first body 73 and the second body 74 may be formed by sintering soft ferrite powder. The first body 73 and the second body 74 according to the first embodiment of the present invention are formed by sintering soft ferrite powder.

The first coil part 75 is located inside the stator body part 72 and various modifications can be implemented within the technical idea of winding along the circumferential direction. The first coil unit 75 according to the present invention is wound in a ring shape. In the first coil unit 75, a coil is wound in a circumferential direction along a ring-shaped inner space formed of a first body 73 and a second body 74.

The first coil unit 75 may be installed in a wound shape between the first body 73 and the second body 74, and the first guide 76 may be installed in the first coil unit 75 as needed. can guide you through the installation. The first guide 76 is installed between the first coil part 75 and the stator body part 72. The first guide 76 is located inside the space formed by the first body 73 and the second body 74 and extends in the circumferential direction. The first guide 76 according to the first embodiment of the present invention is installed in a shape surrounding the upper, lower and inner surfaces of the first coil unit 75 and is installed in a ring shape.

The second stator part 90 faces the first stator part 70, is located inside the hollow part 71, and has a magnetic force. The moving member 95 is located inside the first stator unit 70, and the second stator unit 90 is installed inside the moving member 95. The second stator unit 90 is located inside the moving member 95 and extends in a circumferential direction, and may be formed by sintering soft ferrite powder.

The moving member 95 using a permanent magnet is located between the first stator unit 70 and the second stator unit 90, and various modifications can be implemented within the technical idea of moving in a linear direction by magnetic force change. . The movable member 95 according to the first embodiment of the present invention is made of a plurality of members, and is installed in a state in which the plurality of members are spaced apart along the circumferential direction.

5 is a side cross-sectional view showing movement of the movable member 95 according to the first embodiment of the present invention. As shown in FIG. 5 , when power is applied to the first coil unit 75 , a magnetic field is formed between the first stator unit 70 and the second stator unit 90 . Therefore, the movable member 95 can be moved in a linear direction by magnetic force, and the piston 50 connected to the movable member 95 also moves together with the movable member 95 to compress the refrigerant.

6 is a diagram showing a state in which the iron loss of the linear motor 60 according to the first embodiment of the present invention and the conventional motor is changed as the frequency increases. A core that forms a magnetic field to move the conventional movable member 95 is made of a stack of iron pieces, and is denoted as A in FIG. In addition, the first stator unit 70 and the second stator unit 90 according to the present invention are sintered with soft magnetic ferrite, and the first stator unit 70 and the second stator unit 90 reduce the frequency increase and iron loss. In Fig. 6, it is denoted as B.

The resistivity of the existing stator core is 550 nΩm, and the resistivity of the soft magnetic ferrite core according to the present invention is 0.5 nΩm. Therefore, it can be seen that the core loss of the soft magnetic ferrite core including the first stator unit 70 and the second stator unit 90 is reduced when the frequency increases compared to the conventional core.

The first stator unit 70 and the second stator unit 90 made of ferrite have significantly smaller resistivity compared to the prior art. Since ferrite is close to an insulator, almost no eddy current flows. Therefore, the first stator unit 70 and the second stator unit 90 made of ferrite are suitable for use in a high frequency motor.

Core loss is the sum of hysteresis loss and eddy current loss. Hysteresis loss refers to loss caused by hysteresis. And eddy-current lose refers to power loss due to eddy-current. When an iron core is placed in an alternating magnetic field, hysteresis loss and eddy current loss occur. The magnitude of the iron loss is determined by the maximum magnetic flux density and frequency and the material of the iron core.

The formula for magnetic flux is Φ (magnetic flux) = B (magnetic flux density) x A (cross-sectional area). When soft magnetic ferrite is applied to the stator body 72, since the saturation magnetic flux density of the stator body 72 is lower than that of the core in which the conventional iron plates are stacked, it is necessary to increase the cross-sectional area through which the magnetic flux can flow. Accordingly, since the stator body 72 is located even in the empty space of the conventional outer stator, the stator body 72 sintered with soft magnetic ferrite can be applied without increasing the size compared to the conventional outer stator. have.

Since the stator body portion 72 of the first stator portion 70 and the second stator portion 90 according to the first embodiment of the present invention are sintered with soft magnetic ferrite, eddy current flows even during high-speed operation with increased frequency to reduce the phenomenon of heat generation. Accordingly, the efficiency of the linear motor 60 is improved, and the efficiency of the linear compressor 1 using the linear motor 60 can also be improved.

In addition, since the first stator unit 70 and the second stator unit 90 according to the present invention are manufactured by sintering soft magnetic ferrite without forming a block by stacking a plurality of iron plates, the processing cost is reduced by eliminating the lamination process This can be done, and the number of parts of the linear motor 60 can be reduced.

The second stator unit 90 according to the present invention is manufactured using soft magnetic ferrite, and the conventional inner stator is manufactured by stacking iron plates. In this case, the second stator unit 90 according to the present invention can reduce material cost and processing cost compared to the conventional inner stator. Since the second stator unit 90 does not require processing operations such as punching, lamination, and assembly, the production cost can be reduced by 30% or more, and the assembly process can be shortened due to the reduction in the number of parts.

In addition, since the stator cover 17 and the frame 20 press both sides of the linear motor 60, the strength of the linear motor 60 can be secured.

[Structure of Linear Motor-Second Embodiment]

7 is a plan view of the linear motor 65 according to the second embodiment of the present invention, and FIG. 8 is a side cross-sectional view of the linear motor 65 according to the second embodiment of the present invention.

7 and 8, the linear motor 65 according to the second embodiment of the present invention includes a first stator unit 80, a second stator unit 90 and a moving member 95 . Since the second stator unit 90 and the moving member 95 are the same as the linear motor 65 according to the first embodiment of the present invention, a detailed description thereof will be omitted.

Soft magnetic ferrite is applied only to a part of the first stator unit 80 according to the second embodiment of the present invention, and it can be installed like a core structure in which a plurality of iron plates are stacked. The first stator unit 80 may include at least one of an outer unit 82, an extension body unit 85, a second coil unit 88, and a second guide 89.

The outer part 82 is installed along the circumferential direction from the outside of the moving member 95, and various modifications are possible within the technical idea including ferrite powder. The outer portion 82 according to the present invention may be formed by sintering soft ferrite powder. Also, the outer part 82 may be installed in a shape facing the outer surface of the second coil part 88 .

The outer part 82 according to the present invention may include a first outer 83 and a second outer 84 . The first outer 83 is connected to the first block 86 of the extension body 85 and is installed in the circumferential direction while surrounding the outside of the second coil unit 88 .

In addition, one side of the second outer 84 faces the first outer 83, and the other side of the second outer 84 is connected to the second block 87. In addition, the second outer 84 surrounds the outside of the second coil unit 88 together with the first outer 83 and is installed in the circumferential direction. At least one of the first outer 83 and the second outer 84 may be formed by sintering soft ferrite powder.

Cross sections of the first outer 83 and the second outer 84 are rectangular, and are installed along the circumferential direction from the outside of the second coil unit 88 . The first outer 83 and the second outer 84 are connected to the extension body 85 and are connected to the frame 20 or the stator cover 17 to restrict their movement.

One side of the extension body part 85 is connected to the outer part 82, the other side extends toward the moving member 95, and the second coil part 88 and the second guide 89 are located on the inside. furnish the space The extension body 85 according to the present invention includes a first block 86 and a second block 87.

The first block 86 forms a block by stacking a plurality of iron plates, and is installed in a shape surrounding the upper side of the second coil unit 88 (refer to FIG. 8 below). The first block 86 is installed in a shape surrounding the upper edge of the second coil unit 88, one side of the first block 86 is connected to the first outer 83, and the other side of the first block 86 The side is installed at a position facing the inside of the second coil unit 88. The first block 86 forms a structure by stacking a plurality of iron plates having the same shape.

The second block 87 is installed at a position facing the first block 86 with the second coil unit 88 therebetween, and a plurality of iron plates are stacked to form a block. In addition, the second block 87 is installed in a shape surrounding the lower side of the first block 86. One side of the second block 87 is connected to the second outer 84, and the other side of the second block 87 is installed at a position facing the inside of the second coil unit 88. The second block 87 forms a structure by stacking a plurality of iron plates having the same shape.

The second coil unit 88 is located inside the extension body unit 85, and various modifications can be implemented within the technical idea of winding along the circumferential direction. The second coil unit 88 according to the present invention is wound in a ring shape. The coil forming the second coil unit 88 is wound in a circumferential direction along the ring-shaped inner space formed by the first block 86 and the second block 87.

The second coil unit 88 may be installed in a wound shape inside the space formed by the first block 86, the second block 87, and the outer unit 82, and if necessary, the second guide 89 ) may guide the installation of the second coil unit 88. The second guide 89 is installed between the second coil part 88 and the extension body part 85. The second guide 89 is located inside the space formed by the first block 86, the second block 87 and the extension body 85, and extends along the circumferential direction. The second guide 89 according to the second embodiment of the present invention is installed in a shape surrounding the upper, lower and inner surfaces of the second coil unit 88 and is installed in a ring shape.

The moving member 95 is located in the hollow part 81 of the first stator unit 80 along the circumferential direction, and the second stator unit 90 is located inside the moving member 95.

As described above, according to the present invention, in the linear motor 65, since the first stator unit 80 and the second stator unit 90 installed in a ring shape are formed by sintering soft ferrite powder, , it is possible to reduce the generation of eddy current in high-frequency operation, thereby reducing heat generation, and improving motor efficiency. In addition, since the main components of the present invention are formed by sintering, the number of parts is reduced compared to the prior art, simplifying the assembly process, and improving productivity by reducing the time required for manufacturing.

As described above, the present invention has been described with reference to the drawings illustrated, but the present invention is not limited by the embodiments and drawings disclosed in this specification, and various modifications are made by those skilled in the art within the scope of the technical idea of the present invention. It is obvious that variations can be made. In addition, although the operational effects according to the configuration of the present invention have not been explicitly described and described while describing the embodiments of the present invention, it is natural that the effects predictable by the corresponding configuration should also be recognized.

1: linear compressor
10: shell
11: body shell
12: lead shell
13: ear mount
14: inlet pipe
15: installation pin
17: stator cover
20: frame
25: elastic body
26: resonant spring
27: 1st spring
28: 2nd spring
40: cylinder
42: bore
44: compression chamber
46: discharge cover
47: discharge port
50: piston
54: head
56: flange
58: piston body
60 65: linear motor
70: first stator unit
71: hollow part
72: stator body
73: first body
74: second body
75: first coil part
76: first guide
80: first stator unit
81: hollow part
82: outer part
83: first outer
84: second outer
85: extension body
86: 1st block
87: 2nd block
88: second coil part
89: second guide
90: second stator unit
95: moving member

Claims (14)

delete delete delete delete delete delete a first stator part having a hollow part, installed along the circumferential direction, and changing magnetic poles by supplying power;
a second stator part facing the first stator part, positioned inside the hollow part, and having a magnetic force; and
A moving member positioned between the first stator unit and the second stator unit and moved in a linear direction by a change in magnetic force;
The first stator unit may include an outer unit installed along a circumferential direction from the outside of the moving member and including ferrite powder;
an extension body having one side connected to the outer part and the other side extending toward the moving member and having an installation space therein;
A second coil part located inside the elongated body part and guiding the movement of current; includes,
A second guide installed in a ring shape and installed in a shape surrounding the upper, lower and inner surfaces of the second coil unit; further comprising,
The extension body part includes a first block formed by stacking a plurality of iron plates to form a block, and installed in a shape surrounding the upper side of the second coil part; and
A second block installed at a position facing the first block with the second coil part interposed therebetween, forming a block by stacking a plurality of iron plates, and wrapping the lower side of the first block;
The outer part may include a first outer connected to the first block and installed in a circumferential direction while surrounding an outside of the second coil part; and
A second outer that faces the first outer and the other side is connected to the second block, and is installed in a circumferential direction while surrounding the outside of the second coil together with the first outer,
The first outer and the second outer are formed by sintering soft ferrite powder.
delete delete delete delete The method of claim 7,
The second stator unit is located inside the moving member and extends in a circumferential direction of the linear motor.
The method of claim 12,
The second stator part is a linear motor formed by sintering soft ferrite powder.
a cylinder having a bore;
a piston inserted into the cylinder and linearly reciprocating in an axial direction; and
A linear compressor comprising a; linear motor of claim 7, which generates power for the linear motion of the piston.

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