KR20210120658A - Linear motor and a linear compressor using the same - Google Patents

Abstract

According to the present invention, a first stator unit and a second stator unit 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 located on opposite sides around a first coil unit. Or the first stator unit may include an outer unit installed in a ring shape and formed by sintering the soft magnetic ferrite and an extended body unit extended inward from the outer unit and forming a block with a plurality of steel plates stacked. The second stator unit is located on a center of the first stator unit and may be a single member installed in the ring shape.

Description

Linear motor and linear compressor to which it is applied

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 a refrigerant by receiving power from a power generating device such as a motor or a turbine. Compressors are widely applied in industries, home appliances, and refrigeration cycles of vapor compression chambers.

As long as it consists of a reciprocating compressor in which a compression chamber is formed between a piston and a cylinder and the piston compresses a fluid by linear reciprocating motion, a rotary compressor that compresses a fluid by an eccentrically rotated roller inside the cylinder, and a spiral There is a scroll compressor in which a pair of scrolls are engaged and rotated to compress a fluid.

Recently, among reciprocating compressors, a linear compressor employing a linear reciprocating linear motor without using a crankshaft has been developed. Linear compressors have advantages in that there is no mechanical loss in converting rotational motion into linear reciprocating motion, so the efficiency is improved and the structure is simple.

Such a linear compressor is configured such that a cylinder is positioned inside a casing forming a closed space to form a compression chamber, and a piston covering the compression chamber reciprocates within the cylinder. That is, while the piston is moved to be positioned at the bottom dead center (BDC), the fluid in the closed space is sucked into the compression chamber. And as the piston is moved to be positioned at TDC (Top Dead Center), the process in which the fluid in the compression chamber is compressed and discharged is repeated.

Meanwhile, a linear motor for driving a reciprocating motion of a piston generally includes a stator connected to a cylinder and wound with a coil, and a moving member connected to the piston and reciprocating. 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 inner stator, and a winding coil coupled to the inner stator or the inner stator, the outer stator and the inner A moving member is installed between the stators to be movable in a linear 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 large amount of eddy current flows and heat is generated, thereby reducing motor efficiency. In addition, since the conventional outer stator and inner stator are formed by stacking a plurality of iron plates, there is a problem in that the manufacturing time is increased, and the production cost is increased due to the increase in the number of parts. Therefore, there is a need to improve it.

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

SUMMARY OF THE INVENTION It is an object of the present invention to provide a linear motor capable of reducing heat generation by reducing the generation of eddy currents when the frequency is increased during high-speed operation.

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

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 may be understood by the following description, and will be more clearly understood by the examples of the present invention. Moreover, it will be readily apparent that the objects and advantages of the present invention may be realized by the means and combinations thereof indicated in the claims.

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

The first stator part may include a first body and a second body positioned on both sides facing the first coil part as a center.

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

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

The linear motor according to the present invention includes a first stator part having a hollow part, installed along the circumferential direction, and whose magnetic pole is changed by power supply, and a second stator part facing the first stator part and located inside the hollow part and having a magnetic force It may include a stator part and a moving member positioned between the first stator part and the second stator part and moved in a linear direction by a magnetic force change.

In addition, at least one of the first stator part and the second stator part may include ferrite powder.

In addition, at least one of the first stator part and the second stator part may include soft magnetic ferrite powder.

In addition, the first stator part is located on the outside of the moving member and extends along the circumferential direction and includes a stator body part containing ferrite powder and a first coil part located inside the stator body part and wound along the circumferential direction can do.

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

In addition, the stator body part is installed at a position facing the first body with the first body extending in the circumferential direction and the first body extending in the circumferential direction while surrounding the upper side of the first coil part, and surrounding the lower side of the first coil part and circumferentially 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 magnetic ferrite powder.

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

In addition, the outer part may be formed by sintering soft magnetic ferrite powder.

In addition, the extended body part is installed at a position facing the first block with a plurality of iron plates stacked to form a block, and the first block and the second coil part are installed in a shape surrounding the upper side of the second coil part therebetween. The iron plates 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 includes a first outer connected to the first block, wrapped around the outside of the second coil part and installed in the circumferential direction, and one side faces the first outer part and the other side is connected to the second block and is connected to the second coil part together with the first outer part. It may include a second outer that surrounds the outside of the coil unit and is installed in the circumferential direction.

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

In addition, the second stator part is located inside the moving member and may extend in a circumferential direction.

In addition, the second stator part may be formed by sintering soft magnetic ferrite powder.

The linear compressor according to the present invention may include a cylinder having a bore, a piston inserted into the cylinder and linearly reciprocating in the 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 magnetic ferrite powder, it reduces the generation of eddy currents in high-frequency operation to reduce heat generation. can be reduced, and motor efficiency can be improved.

In addition, in the linear motor according to the present invention, since the main components of the present invention are formed by a sintering operation, the number of parts is reduced compared to the prior art, so that the assembly process is simplified, and productivity can be improved by reducing the time required for manufacturing.

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

1 is a side cross-sectional view simply showing a linear compressor according to a first embodiment of the present invention.
2 is a perspective view illustrating a linear motor according to a first embodiment of the present invention.
3 is a plan view of the linear motor according to the first embodiment of the present invention.
4 is a side cross-sectional view of the linear motor according to the first embodiment of the present invention.
5 is a side cross-sectional view showing the movement of the movable member according to the first embodiment of the present invention.
6 is a view 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 is changed according to an increase in frequency.
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-described objects, features and advantages will be described below in detail with reference to the accompanying drawings, and accordingly, those of ordinary skill in the art to which the present invention pertains will be able to easily implement the technical idea of the present invention. In describing the present invention, if it is determined that a detailed description of a known technology related to the present invention may unnecessarily obscure the gist 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 the first, second, etc. are used to describe various elements, these elements are not limited by these terms, of course. These terms are only used to distinguish one component from other components, and unless otherwise stated, the first component may be the second component, of course.

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

Also, when it is described that a component is "connected", "coupled" or "connected" to another component, the components may be directly connected or connected to each other, but other components are "interposed" between each component. It is to be understood that “or, each component may be “connected,” “coupled,” or “connected” through another component.

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

As used herein, the singular expression includes the plural expression unless the context clearly dictates otherwise. In the present application, terms such as "consisting of" or "comprising" should not be construed as necessarily including all of the various components or various steps described in the specification, some of which components or some steps are It should be construed that it may not include, or may further include additional components or steps.

Throughout the specification, when “A and/or B” is used, it means A, B or A and B, unless specifically stated to the contrary, and when “C to D” is used, it means that there is no specific contrary description. Unless otherwise specified, it means that it is greater than or equal to C and less than or equal to D.

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

The overall structure of the linear compressor 1 according to the first embodiment of the present invention will be looked at with reference to FIG. 1 . 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 repeats the volume increase and decrease as the piston 50 linearly 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 has a different diameter and is installed in an annular shape between the first stator part 70 and the second stator part 90 and the first stator part 70 and the second stator part 90 . It is provided with 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 and a piston (50) inserted into the cylinder 40 and linearly reciprocating in the axial direction ( 50) may include a linear motor 60 for generating power for linear motion.

The above-described structure for the compression of the fluid is disposed 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 lid shell 12 covering the body shell 11 from an upper portion of the body shell 11 . The body shell 11 and the lead shell 12 may be manufactured by, for example, press working a 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 a 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 upwards are provided at the bottom of the shell 10 . And an elastic body 25 such as a coil spring is installed in 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, the vibration generated while the piston 50 linearly reciprocates in the axial direction relative to the cylinder 40 may not be transmitted to the shell 10 . The type and installation method of the elastic body 25 are not limited to the coil spring of the embodiment. For example, a leaf spring may be used, or a method of suspending the frame 20 on a wire may be used.

The frame 20 has the cylinder 40 . The cylinder 40 may be manufactured integrally with the frame 20 . The term “manufactured integrally” includes the concept that the cylinder 40 and the frame 20 are manufactured from different parts and then assembled to form an integral body, or are manufactured as a single part from the beginning.

The cylinder 40 has a cylindrical structure arranged in the axial direction, the front in the axial direction is covered with the discharge cover 46, and the rear in the axial direction is open. A discharge valve (not shown) that is opened by a pressure greater than or equal to a predetermined value is installed in the discharge cover 46 . 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 axially forward of the piston 50 and faces the compression chamber 44 . The cross-section of the head 54 corresponds to the inner 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 at the rear of the head 54 in the axial direction to flow into the compression chamber 44 , and the fluid in the compression chamber 44 moves in the axial direction than the head 54 . Prevent backflow 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 part 70 , a second stator part 90 , and a moving member 95 . The first stator part 70 and the second stator part 90 may be fixed to the frame 20 . The second stator part 90 is installed around the outer periphery of the cylinder 40 , and the first stator part 70 is spaced apart from the second stator in the radial direction.

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

The moving member 95 is fixed to the flange 56 of the piston 50 . Accordingly, the moving member 95 moves in the front-rear direction together with the piston 50 .

The piston 50 is also connected to a resonant spring 26 . The resonant spring 26 is connected to the piston 50 via 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 compression of the fluid is made 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 acts like a pillar of the linear compressor 1, more than necessary support strength is required.

[Operation of the linear compressor]

The embodiment to be described below exemplifies a low-pressure compressor in which the inner 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 internal space of the compression chamber 44 is significantly lower than the pressure of the fluid in the internal space of the shell 10, the check valve of the piston 50 is opened, and the fluid ( 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 internal space of the compression chamber 44 is greater than the pressure of the fluid in the internal space of the shell 10, the check valve of the piston 50 is closed, and the fluid in the compression chamber 44 is (10) There is no backflow into the interior space. A fluid (refrigerant) flows into the shell 10 through the inlet pipe 14 as much as the volume inside the shell 10 increases as the piston 50 moves forward.

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 refrigerating cycle, the inlet pipe 14 may be connected to the evaporator, and the discharge pipe may be connected to the condenser.

When the moving member 95 and the piston 50 move back and forth, 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 the 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 of the present invention It is a side cross-sectional 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 part 70 , a second stator part 90 , and a moving member 95 .

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

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

Either one of the first stator part 70 and the second stator part 90 according to the first embodiment of the present invention may be made of soft magnetic ferrite powder as a material. Alternatively, various modifications such as both the first stator part 70 and the second stator part 90 may be made of soft magnetic ferrite powder as a material are possible.

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

At least one of the first stator part 70 and the second stator part 90 may be manufactured by sintering the soft magnetic ferrite powder. Only soft magnetic ferrite powder can be used, and a solvent and binder may be added to the soft magnetic ferrite powder as needed. 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 is provided with a hollow part 71 and is installed along the circumferential direction, and various modifications are possible within the technical idea that the magnetic pole is changed by the power supply. The first stator part 70 according to the first embodiment of the present invention is installed in a ring shape, and the hollow part 71 of the first stator part 70 has a second stator part 90 and a moving member 95 . 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 moving member 95, extends along the circumferential direction, and is installed in a ring shape. In addition, the stator body portion 72 includes ferrite (Ferrite) powder. The stator body 72 according to the first embodiment of the present invention may be formed by sintering soft magnetic ferrite powder. The stator body portion 72 is formed in a doughnut shape, and a space for installing the first coil portion 75 is provided inside the stator body portion 72 . The stator body 72 may be formed of a single member, or may be formed of a plurality of members, if necessary. When the stator body portion 72 is made 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 to restrict movement, 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 surrounds the upper side (hereinafter, referring to FIG. 4 ) of the first coil part 75 and extends in the circumferential direction. In addition, the first body 73 is located outside the first coil part 75, and has a cross section of a concave shape toward the downward direction in which the first coil part 75 is installed.

The second body 74 is installed at a position facing the first body 73 with the first coil part 75 interposed therebetween, and extends along the circumferential direction while surrounding the lower side of the first coil part 75 . Various modifications are possible within the idea. In addition, the second body 74 is positioned outside the first coil part 75 and has a cross section of a concave shape toward the upper direction where the first coil part 75 is installed.

The first body 73 and the second body 74 may be installed vertically symmetrically around the first coil part 75, and the first body 73 and the second body 74 are coupled to each other to form the first body 73 and the second body 74. An inner space for installing the single coil unit 75 may be formed. In addition, the movement of the first body 73 and the second body 74 is restrained in a state in which the first coil part 75 is wrapped. And at least one of the first body 73 and the second body 74 may be formed by sintering soft magnetic 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 magnetic ferrite powder.

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

The first coil part 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 attached to the first coil part 75 if necessary. 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 along 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 part 75, and is installed in a ring shape.

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

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

5 is a side cross-sectional view showing the movement of the moving member 95 according to the first embodiment of the present invention. 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 moving member 95 can be moved in a straight direction by magnetic force, and the piston 50 connected to the moving member 95 is also moved together with the moving member 95 to compress the refrigerant.

6 is a view 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 according to an increase in frequency. In the related art, a core forming a magnetic field to move the moving member 95 is made of a stack of iron pieces, and is denoted by A in FIG. In addition, the first stator part 70 and the second stator part 90 according to the present invention are sintered with soft magnetic ferrite, and the first stator part 70 and the second stator part 90 reduce the frequency increase and iron loss. In FIG. 6 shown, it is denoted by B.

The resistivity of the conventional 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 soft magnetic ferrite core including the first stator part 70 and the second stator part 90 has reduced iron loss when the frequency increases compared to the conventional core.

The first stator part 70 and the second stator part 90 made of ferrite have a remarkably small resistivity compared to the related art. Ferrite is close to the insulator, so almost no eddy current flows. Therefore, the first stator part 70 and the second stator part 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 a loss caused by hysteresis. And eddy-current loss refers to power loss due to eddy current. Placing an iron core in an alternating magnetic field causes hysteresis loss and eddy current loss. The size 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 portion 72, the saturation magnetic flux density of the stator body portion 72 is lowered compared to the core on which the conventional iron plates are stacked, so it is necessary to increase the cross-sectional area through which the magnetic flux can flow. Accordingly, since the stator body 72 is located in the empty space of the conventional outer stator, the stator body 72 sintered with soft magnetic ferrite can be applied without an increase in size compared to the conventional outer stator. have.

Since the stator body part 72 and the second stator part 90 of the first stator part 70 according to the first embodiment of the present invention are sintered with soft magnetic ferrite, the flow of eddy currents even during high-speed operation when the frequency is increased to reduce the occurrence of heat. Accordingly, the efficiency of the linear motor 60 may be improved, and the efficiency of the linear compressor 1 using the linear motor 60 may also be improved.

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

The second stator part 90 according to the present invention is manufactured using soft magnetic ferrite, and the conventional inner stator is manufactured by laminating iron plates. In this case, the second stator part 90 according to the present invention can reduce material and processing costs compared to the conventional inner stator. Since the second stator part 90 does not have machining operations such as punching, lamination, and assembly, the production cost can be reduced by 30% or more, and the assembly process can be shortened by reducing 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 may 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 part 80 , a second stator part 90 , and a moving member 95 . . Since the second stator part 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.

The soft magnetic ferrite is applied only to a portion of the first stator part 80 according to the second embodiment of the present invention, and it may be installed like a core structure in which a plurality of iron plates are stacked. The first stator part 80 may include at least one of an outer part 82 , an extended body part 85 , a second coil part 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 part 82 according to the present invention may be formed by sintering soft magnetic ferrite powder. Also, the outer part 82 may be installed to face 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 extended body portion 85 and surrounds the outside of the second coil portion 88 and is installed in the circumferential direction.

Also, 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 is installed in the circumferential direction while surrounding the outside of the second coil unit 88 together with the first outer 83 . At least one of the first outer 83 and the second outer 84 may be formed by sintering soft magnetic ferrite powder.

The cross-sections of the first outer 83 and the second outer 84 have a rectangular shape, and are installed along the circumferential direction from the outside of the second coil part 88 . The first outer 83 and the second outer 84 are connected to the extended body portion 85 and are connected to the frame 20 or the stator cover 17 to restrict movement.

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

The first block 86 is a plurality of iron plates stacked to form a block, and is installed in a shape surrounding the upper side of the second coil part 88 (hereinafter, referring to FIG. 8 ). The first block 86 is installed in a shape surrounding the upper edge of the second coil part 88 , and 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 inner side of the second coil part (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 interposed therebetween, and a plurality of iron plates are stacked to form a block. Also, 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 inner side 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 part 88 is located inside the extended body part 85 and various modifications are possible within the technical idea of being wound along the circumferential direction. The second coil part 88 according to the present invention is wound in a ring shape. The coil forming the second coil part 88 is wound in the circumferential direction along the ring-shaped inner space formed by the first block 86 and the second block 87 .

The second coil part 88 may be installed in a wound shape inside the space formed by the first block 86, the second block 87, and the outer part 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 extended body part 85 . The second guide 89 is located inside the space formed by the first block 86 and the second block 87 and the extended 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 part 88, and is installed in a ring shape.

The moving member 95 is located in the hollow portion 81 of the first stator unit 80 in 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, the first stator part 80 and the second stator part 90 installed in a ring shape are formed by sintering soft magnetic ferrite powder. , it is possible to reduce the generation of eddy currents in high-frequency operation, thereby reducing the heat generation phenomenon, and improving the motor efficiency. In addition, since the main components of the present invention are formed by the sintering operation, the number of parts is reduced compared to the prior art, thereby 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 illustrated drawings, but the present invention is not limited by the embodiments and drawings disclosed in the present specification. It is obvious that variations can be made. In addition, although the effects according to the configuration of the present invention are not explicitly described and described while describing the embodiments of the present invention, it is natural that the effects predictable by the 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: resonance spring
27: first spring
28: second 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 part
71: hollow
72: stator body
73: first body
74: second body
75: first coil part
76: first guide
80: first stator part
81: hollow
82: outer part
83: first outer
84: second outer
85: extended body
86: first block
87: second block
88: second coil part
89: second guide
90: second stator part
95: movable member

Claims (14)

a first stator part having a hollow part and installed along the circumferential direction, the magnetic pole being changed by power supply;
a second stator part facing the first stator part and located inside the hollow part, the second stator part having a magnetic force; and
and a moving member positioned between the first stator part and the second stator part and moved in a linear direction by a change in magnetic force;
At least one of the first stator part and the second stator part includes a ferrite powder.
The method according to claim 1,
At least one of the first stator part and the second stator part is a linear motor including a soft magnetic ferrite powder.
The method according to claim 1,
The first stator portion, located outside the moving member, extending along the circumferential direction, the stator body portion comprising a ferrite (Ferrite) powder; and
and a first coil part located inside the stator body part and wound along a circumferential direction.
4. The method according to claim 3,
The stator body portion, a linear motor formed by sintering soft magnetic ferrite (Soft Ferrite) powder.
4. The method according to claim 3,
The stator body portion may include: a first body extending in a circumferential direction while surrounding an upper side of the first coil portion; and
and a second body installed at a position facing the first body with the first coil part interposed therebetween, and extending in a circumferential direction while surrounding a lower side of the first coil part.
6. The method of claim 5,
At least one of the first body and the second body is a linear motor formed by sintering soft magnetic ferrite powder.
The method according to claim 1,
The first stator part is installed along the circumferential direction from the outside of the moving member, the outer part containing ferrite (Ferrite) powder;
an extended body part having one side connected to the outer part and the other side extending toward the moving member and having an installation space therein;
A linear motor including a; located inside the extended body portion, a second coil portion for guiding the movement of the current.
8. The method of claim 7,
The outer part is a linear motor formed by sintering of soft magnetic ferrite (Soft Ferrite) powder.
8. The method of claim 7,
The extended body portion may include: a first block in which a plurality of iron plates are stacked to form a block, and installed in a shape surrounding an upper side of the second coil portion; and
and a second block installed at a position facing the first block with the second coil portion interposed therebetween, a plurality of iron plates stacked to form a block, and a second block surrounding the lower side of the first block.
10. The method of claim 9,
The outer part may include: a first outer connected to the first block and installed in a circumferential direction while surrounding the outside of the second coil part; and
A second outer facing the first outer and the other end connected to the second block, surrounding the outside of the second coil portion together with the first outer and installed in the circumferential direction; Linear motor comprising a.
11. The method of claim 10,
At least one of the first outer and the second outer is a linear motor formed by sintering soft magnetic ferrite powder.
The method according to claim 1,
The second stator part is located inside the moving member and extends along a circumferential direction of the linear motor.
13. The method of claim 12,
The second stator part is a linear motor formed by sintering of soft magnetic ferrite powder.
a cylinder having a bore;
a piston inserted into the cylinder and reciprocating linearly in the axial direction; and
A linear compressor comprising a; the linear motor of any one of claims 1 to 13 for generating power for linear motion of the piston.

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