KR100819612B1 - Linear motor for reciprocating compressor - Google Patents

Abstract

A linear motor for a reciprocating compressor is provided to change the position of coils to reduce iron loss and control rotational direction of the coils for increasing inductance. A linear motor for a reciprocating compressor includes an inner stator(111) having core blocks stacked in the circumferential direction and insulated from each other, an outer stator(112) having core blocks(112a,112a') disposed in the circumferential direction with a predetermined distance and wound with coils(112b), and a plurality of permanent magnets(113) keeping a gap between the inner and outer stators and carrying out straight reciprocating motion by electromagnetic force.

Description

Linear motors for reciprocating compressors {LINEAR MOTOR FOR RECIPROCATING COMPRESSOR}

1 is a view showing an example of a reciprocating compressor according to the prior art.

2 is a view showing only one main part of a reciprocating compressor according to the prior art;

3 is a graph showing the current supplied to the linear motor of FIG.

4 shows a pole arrangement in the linear motor of FIG.

5 is a view showing only one main part of the reciprocating compressor according to the present invention.

6 shows the linear motor of FIG. 5;

7 and 8 are views showing the outer stator applied to FIG.

FIG. 9 illustrates inductance according to coil winding turn in various embodiments of a linear motor. FIG.

<Explanation of symbols on main parts of the drawings>

101 frame 102 fixing member

103: movable member 111: inner stator

112: outer stator 112a, 112a ': core block

112b: coil 112c: core guide

113: permanent magnet 114: connecting member

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a linear motor of a reciprocating compressor that linearly reciprocates a movable member inside a stationary member to compress a refrigerant. In particular, the present invention reduces the loss of iron loss caused by the flow of current into a coil and reduces the inductance. The present invention relates to a linear motor of a reciprocating compressor capable of increasing inductance.

In general, the reciprocating compressor is configured to compress the refrigerant while the piston reciprocates linearly within the cylinder by forming a compression space in which the working gas is absorbed and discharged between the piston and the cylinder.

Recently, the reciprocating compressor includes a component such as a crank shaft in order to convert the rotational force of the drive motor to the reciprocating linear kinetic force of the piston, there is a problem that a large mechanical loss caused by the movement change occurs. Many linear compressors have been developed for this purpose.

Such a linear compressor, in particular, allows the piston to be directly connected to a linear motor in reciprocating linear motion, thereby eliminating mechanical loss due to motion switching, thereby improving compression efficiency, and having a simple structure, and controlling power input to the linear motor. Since the operation can be controlled, the noise is lower than that of other compressors, so it is widely applied to home appliances such as refrigerators used indoors.

1 is a view showing an example of a reciprocating compressor according to the prior art, Figure 2 is a view showing only one main part of the reciprocating compressor according to the prior art, Figure 3 is a current supplied to the linear motor of FIG. 4 is a graph illustrating the arrangement of poles in the linear motor of FIG. 2.

A linear compressor, which is an example of a reciprocating compressor according to the prior art, has a frame 1, a fixing member 2, a movable member 3, and a suction valve inside a shell (not shown) as shown in FIGS. 1 and 2. 4), the structure consisting of the discharge valve assembly (5), muffler assembly (6), motor cover (7), supporter (8), body cover (9), buffer spring (not shown), linear motor (10) is elastic It is installed to be supported.

More specifically, the fixing member 2 is fixed to one end of the frame 1 in a hollow shape with both ends open, and the discharge valve assembly 5 is installed to block one end of the fixing member 2, the discharge valve The assembly 5 is configured such that the discharge valve 5a, the discharge cap 5b, and the discharge valve spring 5c are assembled, and the refrigerant discharged from the discharge cap 5b is vibrated and noised through a loop pipe (not shown). This reduction is then made to exit through the outlet tube (not shown) on the shell side.

Next, the movable member 3 is inserted into the inside of the fixing member 2, one end of which is blocked in a hollow shape, one end of the movable member 3 forms a compression space P between the fixing member 2 and the movable member 3, but is movable A plurality of suction ports 3a through which the refrigerant is sucked into the compression space P are provided at the closed end of the member 3.

At this time, the intake valve 4 is fixed to the closed end of the movable member 3, and is installed to open and close the inlets 3a of the movable member 3 by the pressure change of the compression space P.

Next, the muffler assembly 6 is formed long in the direction of movement in the open end of the movable member 3, and the inside of the muffler assembly 6 is changed into a predetermined space so that the pressure and flow rate may be changed while the refrigerant is flowing. It is configured to be divided into various parts.

Next, the motor cover 7 is axially supported to fix the linear motor 10 and bolted to the frame 1, and the body cover 9 is axially connected to the motor cover 7.

Of course, the body cover 9 is provided with a predetermined suction port to allow the refrigerant introduced from the inlet pipe on the shell side to pass therethrough.

At this time, the supporter 8 is installed between the motor cover 7 and the main body cover 9 coupled thereto, the supporter 8 is fixed to the open end of the movable member 3, and the movable member 3 is The supporter 8 is installed on the motor cover 7 and the main body cover 9 so as to be elastically supported in the axial direction by buffer springs while reciprocating linear movement.

Next, the linear motor 10 has a cylindrical inner stator 11 fixed to the outside of the fixing member 2 as shown in FIG. 2, one end of which is supported by the frame 1 at regular intervals in the radial direction and the other One end of the outer stator 12 supported by the motor cover 7, the permanent stator 13, the movable member 3, and the permanent magnet 13 provided with a predetermined gap between the inner stator 11 and the outer stator 12. It consists of a connecting member 14 for connecting.

At this time, the inner stator 11 is configured such that laminations are stacked in the circumferential direction, while the outer stator 12 is formed on the outer circumferential surface of the coil winding body 12b in which the core blocks 12a and 12a 'are wound in the circumferential direction. The core blocks 12a and 12a 'are fixed to the coil winding 12b by the injection molding 12c to be engaged at regular intervals.

Looking at the operation of the prior art configured as described above, as follows.

When the input power is applied to the linear motor 10, a current flows in the coil winding 12b of the outer stator 12 with an alternating current waveform as shown in FIG. 3 and at the same time the flux is also in the +/- direction. Alternately, the inner stator 11 and the outer stator 12 and the permanent magnet 13 generate mutual electromagnetic force.

At this time, as shown in Figure 4, the inner magnet 11 and the outer stator around the permanent magnet 13 is magnetized to the NS pole, or repeating the magnetized to the SN pole, the pole of the permanent magnet 13 ( Manpower and repulsive force act between the magnetized poles of the inner stator 11 and the outer stator 12 so that the permanent magnet 13 reciprocates linearly.

Therefore, when the permanent magnet 13 and the movable member 3 and the muffler assembly 6 connected thereto reciprocate linearly, the suction valve 4 and the discharge valve assembly 5 as the pressure of the compression space P is varied. ) Operation is automatically adjusted, and by this operation, the refrigerant passes through the suction pipe on the shell side, the opening of the main body cover 9, the muffler assembly 6, and the suction ports 3a of the movable member 3 to the compressed space. It is sucked into (P) and compressed, and then exits through the discharge cap 5b, the roof pipe and the outlet pipe on the shell side.

However, in the reciprocating compressor according to the prior art, since the outer stator is provided with a coil winding inside the core blocks, when a current flows in the coil winding, the flux is caused by mutual electromagnetic force, that is, the inner part of the outer stator, that is, the coil. The flux is generated around the winding body, and the flux flows along the frame, the fixing member, the movable member, and the inner stator made of steel, and the flux flowing along the fixing member and the movable member, including the frame, is partially lost. Iron loss), thereby reducing the linear motor efficiency.

In order to solve this problem, in order to block the flow of the flux to the fixing member, the movable member, including the frame, the above members can be changed to a non-magnetic material, but there are problems such as cost increase and productivity decrease.

The present invention has been made to solve the above problems of the prior art, and provides a linear motor of a reciprocating compressor that can reduce the iron loss generated around the coil by changing only the coil winding position. There is a purpose.

It is also an object of the present invention to provide a linear motor of a reciprocating compressor that can increase the inductance by adjusting the rotational direction of the coil.

The present invention for solving the above problems is an inner stator core block is laminated insulated in the circumferential direction; An outer stator in which core blocks are arranged at regular intervals in the circumferential direction, and coils are wound around the core blocks; And, maintaining a gap between the inner and outer stator, a plurality of permanent magnets reciprocating linear motion by mutual electromagnetic force; provides a linear motor of a reciprocating compressor comprising a.

In addition, the core blocks of the inner stator, the core blocks of the outer stator, the permanent magnets provide a linear motor of the reciprocating compressor, characterized in that the same number is provided to correspond to each other.

In addition, the inner stator has a different pole in the circumferentially neighboring core blocks, the outer stator has a different pole in the circumferentially neighboring core blocks, and the inner stator and the outer stator have a different pole corresponding to each other. A linear motor of a reciprocating compressor is provided.

In addition, the inner stator is provided between the core block, and provides a linear motor of the reciprocating compressor, further comprising a thin insulating piece for preventing the flow of the circumferential flux of the core blocks.

In addition, the insulating piece provides a linear motor of a reciprocating compressor, characterized in that the plastic material.

In addition, the outer stator provides a linear motor of a reciprocating compressor, wherein one coil is wound around inner and outer diameters of the core blocks, respectively.

In addition, the outer stator provides a linear motor of a reciprocating compressor, characterized in that the coil is wound so that the current direction is reversed to neighboring core blocks.

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

5 is a view showing only one main part of the reciprocating compressor according to the present invention, Figure 6 is a view showing the linear motor of Figure 5, Figures 7 and 8 is a view showing the outer stator applied to Figure 5 .

Linear compressor, which is one example of the reciprocating compressor according to the present invention, includes a frame 101, a fixing member 102, a movable member 103, a motor cover 107, and a linear motor as illustrated in FIGS. 5 and 6. However, the linear motor is composed of the inner stator 111, the outer stator 112, the permanent magnet 113 and the connecting member 114.

In this case, since the frame 101, the fixing member 102, the movable member 103, and the motor cover 107 are configured in the same manner as in the related art, detailed description thereof will be omitted.

More specifically, the inner stator 111 is laminated insulated in the circumferential direction between the core blocks 111a in which laminations are stacked, and for this purpose, thin insulating pieces having the same size as laminations between the core blocks 111a. 111b is provided.

Of course, the inner stator 111 is provided with grooves (not shown) at both ends of the core blocks 111a and the insulating pieces 111b, and the O-rings are inserted into the grooves so as to be connected to each other in a circumferential direction. One end is supported on the frame 101 and the other end is installed on the outer circumferential surface of the fixing member 102 by the C-ring.

At this time, the core blocks 111a are made of a material having a low resistance even though flux induced by current flows, whereas the insulation pieces 111b have fluxes induced by current in the circumferential direction of the core blocks 111a. It is made of an insulator to prevent the flow, for example, the core blocks 111a may be composed of eight, the insulating pieces 111b is provided between the core blocks 111a of a plastic material.

In addition, the inner stator 111 is a core block 111a is magnetized by the flux induced as the current flows in the outer stator 112, so that neighboring core blocks 111a have different poles (NS). As the magnet is magnetized, as the AC power is input, the flux induced by the current is also changed in the +/− direction, and the pole NS magnetized to the neighboring core blocks 111a is variable.

Next, the permanent magnet 113 is also installed correspondingly with a predetermined interval in the circumferential direction in the same number as the core blocks 111a of the inner stator 111, and the movable member 103 by the connecting member 114 It is connected so as to reciprocate linearly in the axial direction.

Of course, the permanent magnet 113 is configured to stand the N pole in the inner stator 111 direction, the S pole in the outer stator 112 direction.

Next, the outer stator 112 is composed of core blocks 112a and 112a ', a coil 112b and a core guide 112c, as shown in FIGS. 7 and 8, wherein the coil 112b is formed of core blocks. The outer stator 112 is installed to be wound around the attention of 112a and 112a ', and the outer stator 112 is disposed to be disposed at a predetermined interval in the radial direction of the inner stator 111.

At this time, the core blocks (112a, 112a ') is made of a small material in the resistance, even if the flux induced by the current flows,' a 'shaped lamination is configured to be stacked, the core guide 112c is a coil ( 112b) is made of a non-conducting material through which no current flows, but is formed in a hollow shape having an opening 112h at the center so that a pair of core blocks 112a and 112a 'can be inserted in the axial direction. At both ends thereof, radially extending extensions 112c 'are formed.

Therefore, when looking at the manufacturing process of the outer stator 112, when a pair of core blocks 112a and 112a having a '-' shape are axially pressed into the core guide 112c, the pair of core blocks 112a , 112a ') is configured to have a' C 'shape with the core guide 112c, and a coil 112b is wound around the core guide 112c to form a unit, and such a unit is fixed in the circumferential direction. Installed to be spaced apart.

At this time, the core blocks 112a and 112a 'of the outer stator 112 are installed at predetermined intervals in the circumferential direction in a number corresponding to the core blocks 111a and the permanent magnets 113 of the inner stator 111. In units close to each other, the winding direction of the coil 112b is adjusted so that currents induced by the coil 112b are induced in opposite directions. As shown in FIG. 8, a single coil is wrapped around the core blocks 112a and 112a 'but wound around the core blocks 112 and 112a' adjacent to each other in opposite directions. 6 and 8, a single coil is connected between the coil blocks 112a and 112a ', and the directions to enter neighboring coil blocks 112a and 112a' are opposite to each other. , The core blocks 112 and 112a 'neighboring each other are wound in opposite directions.

As such, the outer stator 112 is installed between the frame 101 and the motor cover 107, and is formed as a unit connected only to the coil 112b, so it is difficult to assemble all at once, so that the outer stator 112 is not included in a separate assembly guide (not shown). Each unit is sandwiched and fixed between the frame 101 and the motor cover 107 at once, and then only the assembly guide is pulled out.

When the linear motor manufactured as described above is operated, mutual electromagnetic force of the inner stator 111 and the outer stator 112 and the permanent magnet 113 is generated while current flows in the coil 112b, and the permanent magnet reciprocates the movable member. Exercised.

Of course, since the center of the coil 112b is moved outward from the core blocks 112a and 112a 'as a whole, the flux generated by the current flowing along the coil 112b is fixed closer to the axial center than the conventional one. Flowing through the member 102 and the movable member 103 can be reduced.

As described above, the first embodiment in which currents induced in cores circumferentially adjacent to the outer stator flow in the same direction and the second embodiment in which currents induced in cores circumferentially adjacent to the outer stator flow in the opposite direction In comparison, the actual inductance value of the second embodiment is higher than the actual inductance value of the first embodiment as shown in Fig. 9, and is higher than the theoretical inductance prediction value of the first embodiment.

In this case, the actual inductance value of the second embodiment is higher than the actual inductance value and the theoretical inductance prediction value of the first embodiment as the number of cores of the outer stator increases, for example, when comparing the outer stator having eight cores The actual inductance value of the second embodiment, the actual inductance value of the first embodiment, and the theoretical inductance prediction value are shown as 202.08 (mL), 102.35 (mL), and 157.06 (mL), respectively. It can be seen that the 99.8% increase compared to the inductance value of the first embodiment, and 28.66% increase compared to the theoretical inductance predicted value of the first embodiment, through which the second embodiment is 99.9% higher than the actual first embodiment and the theoretical first This means 28.66% less flux loss than the example.

[Equation 1]

According to Equation 1, n _t is the number of coil turns in the first embodiment, n _s is the number of coil turns in the second embodiment, L _t is the inductance value in the first embodiment, and L _s is the second embodiment. An inductance value of an example, where the inductance values L _{t and} L _s are proportional to the square of the coil turns n _{t and} n _s .

Therefore, for example, the outer stator having eight cores is substituted with 157.06 (mL) and 202.08 (mL) in the inductance value L _t of the first embodiment and the inductance value L _s of the second embodiment. In this case, the number of coil turns n _s of the second embodiment is 1.4 times the number of coil turns n _t of the first embodiment, and as a result, the number of coil turns n _{s of} the second embodiment is obtained in order to obtain the same inductance value. 40% less than the coil turns n _{t of the} example.

In the above, the present invention has been described in detail by way of examples based on the embodiments of the present invention and the accompanying drawings. However, the scope of the present invention is not limited by the above embodiments and drawings, and the scope of the present invention will be limited only by the contents described in the claims below.

Since the linear motor of the reciprocating compressor according to the present invention configured as described above includes an inner stator and a permanent magnet, including an outer stator in which coils are wound on the inner and outer sides of the core block, flux flows relatively as the current flows in the coil. It is generated outside of the outer stator, and it is possible to reduce the loss (Iron loss) through the inner positioner and the member located inside the relatively, there is an advantage that can increase the linear motor efficiency.

In addition, since the linear motor of the reciprocating compressor according to the present invention can reduce the flux loss (Iron loss) even by changing only the installation position of the coil, there is an advantage of reducing the cost increase and further increasing the productivity.

In addition, the linear motor of the reciprocating compressor according to the present invention can increase the inductance by adjusting the rotational direction of the coil wound around the core blocks arranged at regular intervals in the circumferential direction, thereby increasing the efficiency of the linear motor more There is an advantage to this.

Claims (7)

An inner stator in which core blocks are insulated in a circumferential direction; An outer stator in which core blocks are arranged at regular intervals in the circumferential direction, and coils are wound around the core blocks; And, Including a plurality of permanent magnets to maintain a gap between the inner and outer stator, reciprocating linear motion by mutual electromagnetic force; Inner stator has different poles in circumferentially adjacent core blocks, The outer stator has different poles in the circumferentially adjacent core blocks, The inner and outer stators are linear motors of a reciprocating compressor, characterized in that the core blocks corresponding to each other have different poles. The method of claim 1, The core blocks of the inner stator, the core blocks of the outer stator, the permanent magnets are provided with the same number to correspond to each other, the linear motor of the reciprocating compressor. delete The method of claim 1, The inner stator is provided between the core blocks, the thin insulating piece for preventing the flow of the circumferential flux of the core blocks; linear motor of the reciprocating compressor further comprising. The method of claim 4, wherein Insulating piece is a linear motor of a reciprocating compressor, characterized in that the plastic material. The method of claim 1, A linear motor of a reciprocating compressor, wherein a single coil is wound around the core blocks to form a coil of the outer stator. The method according to claim 1 or 6, And a single coil is wound in opposite directions to neighboring core blocks to form a coil of the outer stator.

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