JPH11173695A - Linear motor compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve reliability by supplying an alternating current supplied from a power source to a coil via a conductor, a flexure bearing and another conductor, thereby sufficiently transmitting the current and eliminating a drive fault due to a current supply fault. SOLUTION: Flexure bearing group 41 are arranged in a laminated state, an axial hole is formed at each center, and a piston rod 32 is inserted. A first current lead system 19a has a wire 18a, an outer peripheral side conductive ring spacer 11, a flexure bearing 4, an inner peripheral side conductive ring spacer 12 and a wire 18b. And, a second current lead system 19b has a wire 18c, an inner peripheral side conductive ring spacer 12, a flexure bearing 4, an outer peripheral side conductive ring spacer 11, and a wire 18d. And, an alternating current from a power source 17 is periodically supplied to a coil 5a via two types of routes. Since both ends of the wires 18b, 18c are fixed to a movable element including the rod 32, the respective wires are operated together during reciprocating of the movable element to increase lifetimes of the wires.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a linear motor compressor, and more particularly, to a linear motor compressor in which a movable body inside a linear motor compressor is supported by flexure bearings.

[0002]

2. Description of the Related Art In a linear motor compressor, a movable body driven directly in a cylinder reciprocates, and a working fluid in a working space defined by an inner wall of the cylinder and the movable body is compressed by the reciprocating movement of the movable body. And supply it to the outside. In this type of linear motor compressor, the working space internal pressure fluctuates periodically with the reciprocating motion of the movable body. Therefore, this working space can be used as a compression space for a Stirling refrigerator or a linear motor compressor. Can be used as a pressure fluctuation source of the pulse tube refrigerator.

[0003] A movable body generally includes a piston reciprocating in a cylinder and a piston rod communicating with a back surface of the piston. To compensate for the linear motion of the movable body, a flexure bearing is attached around the piston rod, and the movable body is configured to be movable in the axial direction of the piston rod but not in the radial direction. . Further, a linear motor as a drive system for reciprocatingly driving the movable body is composed of a permanent magnet and a coil, and an alternating current is supplied to the coil to generate an electromagnetic force, and the movable body is driven by the electromagnetic force. It is.

As a structure of a flexure bearing for supporting a movable body so as to be movable in an axial direction thereof, Japanese Utility Model Registration No. 2
There is one described in US Pat. No. 5,186,671. this is,
As shown in FIGS. 10 and 11, flexure bearing 1
Numeral 01 is made of a good electrical conductor such as beryllium copper including an outer peripheral portion 101a, an inner peripheral portion 101b, and three or more arm portions 101c connecting the outer peripheral portion and the inner peripheral portion. In addition, the lead wire 1
The end of the lead wire 103 is fixed to the outer peripheral portion A of the flexure bearing 101. On the other hand, one end of a lead wire 103b is fixed to the inner peripheral portion B of the flexure bearing 101.
Is fixed to the movable coil 104.

When a current is supplied from the hermetic terminal 102, the current reaches the outer circumference of the flexure bearing 101 through the lead wire 103a, and is transmitted from the outer circumference of the flexure bearing to the inner circumference via the arm portion, and further, the lead is formed. Line 1
The movable coil 104 arrives at the moving coil 104 through 03b. In this way, the flexure bearing is used as a current lead of a linear motor.

[0006]

In the above prior art, the lead wire is directly fixed to the flexure bearing, and the contact area thereof is small. Therefore, when the flexure bearing is used as a current lead, it is sufficient. Current cannot be transmitted to the motor, and there is a risk of causing a drive failure of the linear motor. For this reason, there has been a problem that the reliability of the linear motor compressor is lacking.

[0007] The present invention has been made in view of the above circumstances, and has as its technical object to improve the reliability of a linear motor compressor.

[0008]

SUMMARY OF THE INVENTION In order to solve the above-mentioned technical problems, a first aspect of the present invention is directed to a cylinder formed in a housing and a movable member arranged reciprocally in the cylinder. A movable body formed with a body, a shaft-shaped portion at the center portion, an outer-peripheral fixing portion formed of a ring-shaped portion on the outer peripheral edge side and fixed in the housing, and a ring-shaped portion on the central edge side around the shaft hole; An inner peripheral fixing portion fixed to the arm, an arm portion connecting the outer peripheral fixing portion and the inner peripheral fixing portion, and a conductive member that supports the movable member when the movable member is inserted through the shaft hole. A flexure bearing, a first power supply body attached to the outer peripheral fixed portion of the flexure bearing surface, and a second power supply body attached to the inner peripheral fixed portion of the flexure bearing surface. And permanent magnet and carp A driving system for reciprocatingly driving the movable body based on a thrust generated by applying an alternating current to the coil, a power supply for supplying an alternating current to the coil, and an alternating current supplied from the power supply. First
A linear motor compressor includes a power supply, the flexure bearing, and a current lead system for supplying current to the coil via the second power supply.

According to the above-mentioned invention, the conductive flexure bearing for supporting the movable body by inserting the movable body into the shaft hole formed at the center portion has a ring-shaped portion on the outer peripheral edge side as an outer peripheral fixed portion. Is fixed to the movable body as an inner peripheral fixing portion of the ring-shaped portion on the central edge side around the shaft hole,
The outer peripheral fixing portion and the inner peripheral fixing portion are connected by an arm. Such a flexure bearing is provided with a first power supply body contacting the outer peripheral fixing portion and a second power supply member contacting the inner peripheral fixing portion. The alternating current supplied from the power source is supplied to the coil of the drive system that drives the movable body via the first power supply, the flexure bearing, and the second power supply by the current lead system.

As described above, in the current lead system, the alternating current supplied from the power supply is supplied to the coil through the first power supply, the flexure bearing, and the second power supply. The current supply area is enlarged and transmitted to the outer peripheral fixed portion by the first power supply body contacting the outer peripheral fixed portion of the flexure bearing, and current is supplied from the outer peripheral fixed portion to the arm portion and from the arm portion to the inner peripheral fixed portion. You. The current from the inner peripheral fixed portion is transferred to a second power supply having an enlarged energized area by contacting the inner peripheral fixed portion with a surface, and the second electric power is supplied to the coil.

Therefore, when the flexure bearing is used as a current supply path to the drive system, the current supply area is enlarged by the first power supply body, and the current is delivered to the flexure bearing. Since the current supply area is enlarged by the second power supply and received by the second power supply, the current is sufficiently transmitted, and the drive failure does not occur due to the poor current supply to the linear motor compressor. The reliability can be improved.

The first power supply body may be of any type as long as it comes into contact with the inner peripheral fixing portion of the flexure bearing to increase the energizing area. Preferably, the first power supply body comes into contact with the entire inner peripheral fixing portion of the flexure bearing. A ring is good. By contacting the entire surface of the inner peripheral fixing portion, the energized area can be maximized. Similarly, the second power supply body may be any one that expands the energization area by contacting the outer peripheral fixing portion of the flexure bearing, but is preferably a ring-shaped one that contacts the entire outer peripheral fixing portion of the flexure bearing. Is good. By contacting the entire surface of the outer peripheral fixing portion, the energized area can be maximized.

When a plurality of flexure bearings are arranged in the stacking direction and the movable body is supported by the plurality of flexure bearings, the first and second power supply members are interposed between the flexure bearings. Also, it can share a role as a spacer for avoiding contact between the flexure bearings.

As a material of the first and second power supply bodies, a copper-based material such as iron and steel, brass, beryllium copper or phosphor bronze can be cited, but a copper-based material is preferably selected as a material. With such a material, the flexure bearing can be held by the power supply body itself, and the current can be reliably transmitted with high conductivity.

Further, in solving the above technical problem by the invention of claim 1, as in the invention of claim 2, the conductive flexure bearing is formed of an iron-based metal including steel and stainless steel. Preferably.

As the material of the flexure bearing, there may be mentioned conductive materials such as phosphor bronze and beryllium copper in addition to steel and stainless steel. Iron-based metals such as steel and stainless steel which are inexpensive and have high fatigue strength can be used. By forming a conductive flexure bearing by using the same, the linear motor compressor can be manufactured at low cost and the durability thereof can be improved in addition to the operation and effect of the first aspect.

[0017]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a sectional view of a Stirling refrigerator using a linear motor compressor according to this embodiment. In the figure, a Stirling refrigerator 100 includes a linear motor compressor 1, an expansion section 50, and a working gas passage 8 connecting the linear motor compressor 1 and a refrigeration generation section 51.

The linear motor compressor 1 includes a housing 2
, Movable body 3, 3 ′, flexure bearing group 41,
42, 43, and 44, and a linear motor 5 as a drive system,
5 ′.

The housing 2 is formed in a substantially cylindrical shape, and a cylinder portion 21 having a cylindrical internal space is formed in a substantially central portion in the figure. Also,
The right side in the figure is a first housing part 22 which forms a first housing space A communicating with the space in the cylinder, and the left side in the figure forms a second housing space B communicating with the space in the cylinder. The second housing portion 23 is provided. Fins 24 are formed on the outer periphery of the cylinder portion 21 so that heat generated by driving the linear motor compressor 1 can be released to the outside.

The movable body 3 includes a piston 31 disposed on the right side of the cylinder space of the cylinder portion 21 in the drawing, a piston rod 32 connected to the back surface 31a of the piston 31 and extending into the first accommodation space A, A flange 33 having a disk portion 33a extending radially from the outer periphery of the rod 32 and a cylindrical portion 33b bent substantially at right angles from the outer peripheral end of the disk portion 33a and extending in the axial direction of the piston rod 32. . Similarly, the movable body 3 ′ is provided with a piston 3 disposed on the left side of the cylinder space of the cylinder portion 21 in the drawing.
1 ', a piston rod 32' connected to the back surface 31'a of the piston 31 'and extending into the second accommodation space B, and a disk portion 33' extending radially from the outer periphery of the piston rod 32 '.
and a cylindrical portion 3 which is bent substantially at right angles from the outer peripheral end of the disk portion 33'a and extends in the axial direction of the piston rod 32 '.
3'b.

The front surfaces 31b and 31'b of the piston 31 and the piston 31 'face each other in the cylinder space, and the cylinder inner wall 21 constituting the wall surface of the cylinder space is formed.
a and a compression space C is defined by the piston front surfaces 31b and 31'b. The two pistons 31, 31 'are opposed to each other and reciprocate in the cylinder space. Such a type of compressor is generally called an opposed-type linear motor compressor.

A first housing formed in the first housing portion 22
A yoke 6 is fixed to the inner wall surface of the housing space A. The yoke 6 includes a ring-shaped outer peripheral ring portion 6 a disposed in contact with the inner wall surface of the first accommodation space A, and an outer peripheral ring portion 6.
a and a connecting portion 6c connecting the outer ring portion 6a and the inner ring portion 6b.

Similarly, a yoke 6 'is fixed to the inner wall surface of the second housing space B formed in the second housing portion 23. The yoke 6 ′ includes a ring-shaped outer peripheral ring portion 6 ′ a disposed in contact with the inner wall surface of the second storage space B,
A ring-shaped inner peripheral ring portion 6'b disposed between the outer peripheral ring portion 6'a and the piston rod 32 ', and a connection for coupling the outer peripheral ring portion 6'a and the inner peripheral ring portion 6'b. Part 6 '
c.

A ring-shaped space D is formed between the outer ring portion 6a and the inner ring portion 6b of the yoke 6, and a driving system 5 for reciprocally driving the movable body 3 in the ring space D is formed.
Are arranged. The drive system 5 includes a ring-shaped permanent magnet 5a fixed and held in a state of being embedded in the inner peripheral wall surface of the outer peripheral ring portion 6a, and a portion extending into the ring-shaped space D from the tip of the coil support portion 33b of the flange 33. And a coil 5b wound around the coil 5b. The inner peripheral surface of the ring-shaped permanent magnet 5a faces the outer periphery of the coil 5b with a predetermined gap therebetween.

Similarly, the outer peripheral ring portion 6'a of the yoke 6 '
A ring-shaped space E is formed between the ring-shaped space E and the inner peripheral ring portion 6'b, and a drive system 5 'for reciprocatingly driving the movable body 3' is provided in the ring-shaped space E. The driving system 5 '
A ring-shaped permanent magnet 5a 'fixed and held in a state of being embedded in the inner peripheral wall surface of the outer ring portion 6'a, and extends into the ring-shaped space E from the tip of the coil support portion 33'b of the movable body 3'. And a coil 5'b wound around the portion. The inner peripheral surface of the ring-shaped permanent magnet 5'a is
Are kept facing each other with a predetermined gap kept on the outer peripheral side of.

On the right side of the piston rod 32 in the figure,
A flexure bearing group 41 is provided, and a flexure bearing group 42 is provided on the left side in the figure. Similarly, a flexure bearing group 43 is arranged on the right side of the piston rod 33 in the figure, and a flexure bearing group 44 is arranged on the left side of the piston rod 33 in the figure. The flexure bearings support the piston rods 32 and 32 'so that they can move in the axial direction but not in other directions.

The space in the passage of the working gas passage 8 communicates with the compression space C. One end of the working gas passage 8 opens into the cylinder inner wall 21a of the cylinder portion 21 and the other end communicates with the expansion portion 50. The working gas passage 8 communicates the working gas in the compression space C with the expansion portion 50. Things.

The expansion section 50 is provided on an expansion cylinder 51, a movable body 52 which can reciprocate in the expansion cylinder 51, and an outer periphery on the right side of the expansion cylinder 51 in the drawing to release generated heat to the outside. For moving the movable body 52 reciprocally, and a housing 54 defining therein a third housing space F which is formed continuously from the fins 53 and communicates from the right side in the drawing with the internal space of the expansion cylinder 51. And a drive unit 55 of the above.

A movable body 52 is accommodated in an expansion cylinder 51 and an expansion piston 52a reciprocates in the expansion cylinder.
A regenerator 52b housed inside the expansion piston 52a and serving to store heat; a piston rod 52c connected to the back of the expansion piston 52a and extending into the third housing space F; It comprises a flange 52d extending radially from the end in a disk shape, and is elastically supported by a spring 56 connected to the rear end of the piston rod 52c and the inner wall of the housing 54.

The driving portion 55 is fixed to the flange 52d, and is provided with a coil 55a which is disposed so as to protrude forward from an outer peripheral edge of the flange 52d, and a ring-shaped member formed integrally with the housing 54 and extending into the third accommodation space F. And a ring-shaped permanent magnet 55b fixed to the outer periphery of the yoke portion 54a. The outer peripheral surface of the permanent magnet 55b faces the inner peripheral surface of the coil 55a while maintaining a predetermined gap.

The regenerator 52b is formed by laminating a plurality of meshes made of a material having a high specific heat of low temperature, such as copper, and the working gas in the regenerator 52b passes through the gap of the mesh from one end to the other. It is configured so that it can communicate with the end.

Working passage 8 whose one end is open to compression space C
The other end is open to a ring-shaped hole 51a formed in the expansion cylinder 51. The expansion piston 52
A first communication path 57 and a second communication path 58 are formed in a, one end of the first communication path 57 communicates with one end (high temperature end) of the regenerator 52b, and the other end of the first communication path 57 Spring 5
6, the concave portion 51a of the expansion cylinder 51 in the natural length state.
It is made to face almost the center of the. On the other hand, one end of the second communication passage 58 communicates with the other end (low temperature end) of the regenerator 52b,
The other end of the second communication passage 58 opens to an expansion space G defined by the expansion piston 52a and the expansion cylinder 51. Accordingly, the working gas in the compression space C flows from the compression space C to the space in the passage in the working passage 8 and the hole 51 of the expansion cylinder 51.
a, which communicates with the expansion space G through the first communication path 57, the regenerator 52b, and the second communication path 58.

Further, a cold head 59 is provided in the expansion space G.
Are contacted, and the cold head 59 and the cooled object (not shown) are in thermal contact with each other to cool the cooled object.
The cold head 59 and the expansion cylinder 51 are housed in a vacuum chamber 60 whose inside is in a vacuum state.

Each flexure bearing group 41, 42, 4
3 and 44 are flexure bearings 4 having the shape shown in FIG.
Are arranged in parallel, and the movable body 3 can reciprocate in the axial direction (axial direction of the piston rod 32) by the flexure bearing groups 41 and 42, but cannot move in other directions. The movable body 3 'is supported in a certain manner, and the movable body 3' can be reciprocated in the axial direction (axial direction of the piston rod 32 ') by the flexure bearings 43 and 44, but in other directions. The movable body 3 'is supported so as to be immovable.

As shown in FIG. 2, the flexure bearing 4 is formed in a disk shape, and a shaft hole 7 is formed in the center thereof. Further, the flexure bearing 4 is surrounded by an outer peripheral fixing portion 4a formed by a ring-shaped portion on the outer peripheral edge side surrounded by the outer peripheral edge H and the dotted line I, and the inner peripheral edge J and the dotted line K shown in the figure. An inner fixed portion 4b formed of a ring-shaped portion on the center edge side, an outer fixed portion 4a, and an inner fixed portion 4
b. A plurality of outer peripheral fixing holes 4d for fixing the flexure bearing 4 to the yoke 6 or 6 'are formed at predetermined intervals in the radial direction in the outer peripheral fixing portion 4a.
b, the flexure bearing 4 is attached to the piston rod 32.
Alternatively, a plurality of inner peripheral fixing holes 4e for fixing to 32 'are formed at predetermined intervals in the radial direction.

The three arms 4c are separated by three slits 4f. One end of the slit 4f is formed in the outer peripheral fixing portion 4a, extends in the center direction from the one end, gradually extends in the radial direction, approaches the inner peripheral fixing portion 4b while gradually reducing the radius of curvature in a spiral shape, and The inner peripheral fixing portion 4b enters the peripheral fixing portion 4b at a substantially right angle, and the other end is formed on the inner peripheral fixing portion 4b. Three slits having such a shape are formed at equal intervals, and a portion between the slits is an arm 4c. Therefore, the shape of each arm is also formed in a substantially spiral shape similar to the shape of the slit.

In the flexure bearing having the above structure, when the inner peripheral fixing portion 4b reciprocates in the axial direction (vertical direction with respect to the paper surface of FIG. 2) relative to the outer peripheral fixing portion 4a, each arm portion is bent. This allows the inner peripheral fixing portion 4b to move in the axial direction.

The shaft hole 7 formed at the center of the flexure bearing 4 described above has a piston rod 3 shown in FIG.
2 or 32 'is inserted, whereby the piston rod 32 or 32' is supported so that it can move in the axial direction, but cannot move in other directions.

FIG. 3 is an enlarged sectional view of the linear motor compressor in the first housing space A of FIG. 1, and FIG. 9 is an enlarged sectional view of the vicinity of the flexure bearing group 41 in FIG.
Note that the configuration in the second storage space B is a configuration in which the configuration in the first storage space A is symmetrically arranged, and the respective configurations are the same, so the configuration in the first storage space A described below. And its explanation is omitted. In the figure, a flexure bearing group 41 includes a flexure bearing 4 shown in FIG.
Are arranged in a stacked state of eight sheets. The flexure bearings 4-1 to 4-8 are arranged so that the center of a shaft hole 7 formed at the center thereof is on the same axis.
, A piston rod 32 is inserted. Further, the outer peripheral fixing hole 4d and the inner peripheral fixing hole 4e formed in each flexure bearing face each other, and are arranged so that screws and the like for attachment are inserted into the outer peripheral fixing hole 4d and the inner peripheral fixing hole 4e. Have been.

Flexure bearings 4-1, 4-2, 4
-3, 4-4, 4-5, and 4-6, the outer ring spacers 9-1, 9-2, 9-3, 9-4, and 9-
5, 9-6, and inner peripheral ring spacers 10-1, 1
0-2, 10-3, 10-4, 10-5, and 10-6 are provided.

The outer ring spacers 9-1 to 9-6 are
It has the same shape as the outer peripheral side ring spacer 9 shown in FIG.
The outer peripheral side ring spacer 9 has a plurality of outer peripheral fixing holes 9a formed at equal intervals in the radial direction. As can be seen by comparing FIGS. 2 and 4, the outer peripheral ring spacer 9 has substantially the same shape as the outer peripheral fixing portion 4a of the flexure bearing 4, and the positions of the outer peripheral fixing holes (9a, 4d) are also the same. is there.

The outer peripheral ring spacer 9 having such a shape.
-1 to 9-6, each flexure bearing 4-1 to 4-
The outer peripheral fixing portion 4a of FIG. 6 is abutted from the right side in the figure, and is arranged in a state where insertion of the screw into the outer peripheral fixing holes (4d, 9a) is ensured.

Inner circumference ring spacers 10-1 to 10-6
Has the same shape as the inner peripheral side ring spacer 10 shown in FIG. The inner peripheral ring spacer 10 has a plurality of inner peripheral fixing holes 10a formed at equal intervals in the radial direction. As can be seen by comparing FIG. 2 and FIG.
No. 0 has substantially the same shape as the inner peripheral fixing portion 4b of the flexure bearing 4, and the positions where the inner peripheral fixing holes (10a, 4e) are formed are also the same.

The inner peripheral ring spacer 1 having such a shape
0-1 to 10-6 are abutted on the inner peripheral fixing portions 4b of the flexure bearings, and are arranged in a state where insertion of screws into the inner peripheral fixing holes (4e, 10a) is ensured. .

An outer peripheral first conductive ring spacer 11-1 and an inner peripheral first conductive ring spacer 12-1 formed of a conductor are disposed on the right side of the flexure bearing 4-7 in the figure.

Outer peripheral first conductive ring spacer 11-1
Has the same shape as the outer peripheral side conductive ring spacer 11 shown in FIG. In the outer peripheral side conductive ring spacer 11, a plurality of outer peripheral fixing holes 11a and one current lead hole 11b are formed at equal intervals in the radial direction. As can be seen by comparing FIGS. 2 and 6, the outer peripheral side conductive ring spacer 11 has substantially the same shape as the outer peripheral fixing portion 4a of the flexure bearing 4, and the outer peripheral fixing holes (9a, 4a) excluding the current lead hole 11b.
The formation position of d) is also the same. When the outer peripheral fixing hole 11a of the outer peripheral side conductive ring spacer 11 and the outer peripheral fixing hole 4d of the flexure bearing 4 are arranged to face each other, the current lead hole 11
b is one outer peripheral fixing hole 4d of the flexure bearing 4
It is arranged and formed so as to face.

The inner conductive ring spacer 12-1 has the same shape as the inner conductive ring spacer 12 shown in FIG. The inner peripheral conductive ring spacer 12 has a plurality of inner peripheral fixing holes 12a and one current lead hole 12b formed at equal intervals in the radial direction. As can be seen by comparing FIGS. 2 and 7, the inner conductive ring spacer 12 has substantially the same shape as the inner fixed portion 4b of the flexure bearing 4.
Inner circumference fixing holes (12a, 4e) excluding current lead holes 12b
Are formed at the same position. When the inner peripheral fixing hole 12a of the inner peripheral conductive ring spacer 12 and the inner peripheral fixing hole 4e of the flexure bearing 4 are arranged to face each other, the current lead hole 12b of the inner peripheral conductive ring spacer 12 It is arranged and formed so as to face one inner peripheral fixing hole 4 e of the kusha bearing 4.

Outer peripheral first conductive ring spacer 11-1
As shown in FIG. 9, the outer peripheral surface of the flexure bearing 4-7 is abutted against the outer peripheral fixing portion from the right side in the drawing, and is arranged in a state where the screws are inserted into the outer peripheral fixing holes 4d, 9a, and 11a. ing. Also, the inner peripheral first conductive ring spacer 12-1 comes into contact with the inner peripheral fixing portion of the flexure bearing 4-7 from the right side in the drawing, and contacts the inner peripheral fixing holes 4e, 1e.
It is arranged in a state where insertion of screws into 0a and 12a is ensured. In FIGS. 3 and 9, the outer peripheral side first conductive ring spacer 11-1 and the inner peripheral side first conductive ring spacer 12-1 are respectively formed by the current lead holes 11.
Since the cross-sections of b and 12b are shown, it seems that screws cannot be inserted into these holes. However, as shown in FIG. When viewed from the cross section of the inner peripheral fixing hole 12a, the insertion of the screw is ensured.

The outer peripheral first conductive ring spacer 11
-1 and the flexure bearing 4-6, an outer insulating ring spacer 9-7 having the same shape as the outer ring spacer 9 shown in FIG.
An inner circumferential insulating ring spacer formed between the inner conductive ring spacer 12-1 and the flexure bearing 4-6 has the same shape as the inner ring spacer 10 shown in FIG. 10-7 is interposed so that each conductive ring spacer does not conduct to the flexure bearing 4-6.

On the right side of the flexure bearing 4-8 in the figure, an outer peripheral side second conductive ring spacer 11-2 formed of a conductor and having the same shape as the outer peripheral side first conductive ring spacer 11-1; And an inner peripheral side second conductive ring spacer 12-2 having the same shape as the inner peripheral side conductive ring spacer 12-1. The outer-peripheral-side conductive ring spacer 11-2 abuts against the outer peripheral fixing portion 4a of the flexure bearing 4-8 from the right side in the drawing, and is arranged in a state where the screw is securely inserted into the outer peripheral fixing hole 4d. . The inner-peripheral second conductive ring spacer 12-2 abuts against the inner-peripheral fixing portion 4b of the flexure bearing 4-8 from the right side in the drawing to ensure that the screw is inserted into the inner-peripheral fixing hole 4e. It is what is arranged in. Further, between the outer peripheral side second conductive ring spacer 11-2 and the flexure bearing 4-7, the outer peripheral side insulating ring spacer 9 having the same shape as the outer peripheral side ring spacer 9 shown in FIG. -8 is provided between the inner peripheral side conductive ring spacer 12-2 and the flexure bearing 4-7 in the same manner as the inner peripheral side ring spacer 10 shown in FIG. A ring spacer 10-8 is interposed so that each conductive ring spacer does not conduct to the flexure bearing 4-7. Also, on the left side of the flexure bearing 4-8 in the drawing, an outer peripheral side insulating ring spacer 9-9 having the same shape as the outer peripheral side ring spacer 9 shown in FIG. 4 and formed of an insulator, and an inner peripheral side shown in FIG. An inner peripheral side insulating ring spacer 10-9 having the same shape as the ring spacer 10 and formed of an insulator is arranged.

As is apparent from FIGS. 3 and 9, the current lead holes of the outer peripheral side conductive ring spacers 11-1 and 11-2 are arranged at different positions so as not to face each other. Similarly, the inner peripheral side conductive ring spacer 12-
The current lead holes 1 and 12-2 are arranged at different positions so as not to face each other.

The flexure bearing group 42 is, similarly to the flexure bearing group 41, arranged such that eight flexure bearings 4 shown in FIG. Each flexure bearing 4-9 to 4-16 is arranged such that the center of a shaft hole formed in the center thereof is on the same axis,
A piston rod 32 is inserted through the shaft hole. Also,
The outer peripheral fixing hole and the inner peripheral fixing hole formed in each flexure bearing are opposed to each other, and are arranged so that screws or the like for attachment are inserted into the outer peripheral fixing hole and the inner peripheral fixing hole.

The outer peripheral ring portion 6a of the yoke 6 is formed with a plurality of radially extending concave portions 61a penetrating in the axial direction. The right end in the figure of the concave portion 61a faces the outer peripheral fixing hole formed in the outer peripheral fixing portion of each flexure bearing of the flexure bearing group 41. Therefore, by inserting fixing means such as screws into the outer peripheral fixing holes from the right side of the flexure bearing group 41 in the figure and fixing them, the outer peripheral fixing portions of the flexure bearings are sandwiched by the ring spacers and the outer periphery of the yoke 6. It is fixed to the ring part 6a. On the other hand, the left end in the figure of the concave portion 61a faces the outer peripheral fixing hole formed in the outer peripheral fixing portion of each flexure bearing of the flexure bearing group 42. Therefore, by inserting fixing means such as screws into the outer peripheral fixing holes from the left side of the flexure bearing group 42 in the drawing and fixing them, the outer peripheral fixing portions of the flexure bearings are sandwiched by the ring spacers and the outer periphery of the yoke 6. It is fixed to the ring portion 6a.

As is apparent from the drawing, the piston rod 32 is connected to a first insertion portion 32a inserted into the flexure bearing group 41, and is connected to the first insertion portion 32a and is connected to the first insertion portion 32a. A first flange portion 32b having a diameter larger than that of the first flange portion 32a;
A second insertion portion 32c inserted through the second insertion portion 32, a second flange portion 32d continuous from the second insertion portion 32c and having a diameter larger than that of the second insertion portion 32c;
And a connecting portion 32e for connecting the second flange portion 32d to the flange portion 32b. The diameters of the first flange portion 32b and the second flange portion 32d are substantially the same as the diameter of the inner peripheral fixed portion of the flexure bearing.

The first flange portion 32b is formed with a plurality of axial concave portions that are opened on the surface facing the flexure bearing group 41. This axial recess is formed in an inner peripheral fixing hole 4 formed in the inner peripheral fixing portion of each flexure bearing.
A plurality is formed at a position facing e. Of the plurality of axial recesses, the axial recess facing the current lead hole 12b of the inner peripheral second conductive ring spacer 12-2 is provided in the first passage 13, and the inner peripheral first conductive ring spacer 12 is provided.
-1 current lead hole 12b is the fourth axial recess.
The passage 16 is used.

The first flange portion 32b is further formed from the peripheral side surfaces of the second passage 14 and the third passage 15.
As is apparent from the figure, the second passage 14 is connected to the first passage 13
And the third passage 15 communicates with the fourth passage 16 inside the first flange portion 32b.

The power supply 17 for supplying the alternating current has two output terminals. One end of the first electric wire 18a is connected to one of the output ends 17a. The other end of the first electric wire 18a is connected to the flexure bearings 4-1 to 4-7 of the flexure bearing group 41, the outer peripheral ring spacers 9-1 to 9-6, and the outer peripheral first conductive ring spacer as shown in the drawing. The outer peripheral fixing holes (4d, 9a, 11
a) and electrically connected to the outer peripheral side second conductive ring spacer 11-2 by soldering or the like. Here, the first electric wire 18a has a flexure bearing 4-1 to 4-7 through which the first electric wire 18a is inserted and an outer ring spacer 9-1 to 4-1.
9-6, outer peripheral side insulating ring spacers 9-7 to 9-8, and outer peripheral side second fixing holes (4d, 9a, 11a) provided in a plurality of outer peripheral side first conductive ring spacers 11-1.
After passing through the outer peripheral fixing hole facing the current lead hole 11b formed in the conductive ring spacer 11-2 and further passing through the current lead hole 11b, the outer peripheral side second hole is formed by soldering or the like.
It is electrically connected to the conductive ring spacer 11-2.

The other output terminal 1 of the power supply for supplying the alternating current
7b is connected to one end of the fourth electric wire 18d. The other end of the fourth electric wire 18d is connected to the flexure bearings 4-1 to 4-6 of the flexure bearing group 41, the outer ring spacers 9-1 to 9-6, and the outer insulating ring spacer 9- as shown in FIG. Peripheral fixing holes (4d, 9a) formed in 7
And is electrically connected to the outer peripheral first conductive ring spacer 11-1 by solder or the like. Here, the fourth electric wire 18d has a plurality of outer peripheral fixing holes (4d, 9a) provided in the flexure bearings 4-1 to 4-6 and the ring spacers 9-1 to 9-7 through which the fourth electric wire 18d is inserted. The outer peripheral side first conductive ring spacer 11-1 is passed through the outer peripheral fixing hole facing the current lead hole 11b formed in the outer peripheral side first conductive ring spacer 11-1 and further passed through the current lead hole 11b with solder or the like. Are electrically connected to the

One end of the second electric wire 18b is electrically connected to the inner peripheral side second conductive ring spacer 12-2 at the current lead hole 12b of the ring spacer 12-2 by soldering or the like. The second electric wire 18b extends from the current lead hole 12b of the ring spacer 12-2 to the lead hole 12b.
b, the inner peripheral fixing holes (4e, 10e) of the flexure bearing 4-8 and the inner peripheral side insulating ring spacer 10-9.
a) and further through the first passage 1 of the first flange portion 32b.
3. The coil 5b is electrically connected to one end of the coil 5b from the other end via the second passage 14.

One end of the third electric wire 18c is electrically connected to the inner peripheral side first conductive ring spacer 12-1 at the current lead hole 12b of the ring spacer 12-1 by soldering or the like. The third electric wire 18c extends from the current lead hole 12b of the ring spacer 12-1 to the lead hole 12b.
b, through the inner peripheral fixing holes (4e, 10a) of the flexure bearings 4-7, 4-8 and the inner peripheral side insulating ring spacers 10-8, 10-9, and further through the fourth passage 16, the third
It is electrically connected to the other end of the coil 5b via the passage 15 from the other end.

In this example, each outer ring spacer and each inner ring spacer were made of ceramic such as alumina, and each outer insulating ring spacer and each inner ring spacer were made of stainless steel. Further, each outer peripheral side conductive ring spacer and each inner peripheral side conductive ring spacer were made of copper. Each flexure bearing used was made of stainless steel.

In the Stirling refrigerator 100 including the linear motor compressor 1 having the above-described structure, when an alternating current is applied from the power supply 17 to the coil 5b, the magnetic field whose direction is periodically reversed around the coil 5b by electromagnetic induction. Occurs. The generated magnetic field interferes with the magnetic field formed by the permanent magnet 5a, and serves as a thrust for reciprocating the movable body 3 in the axial direction. Since the movable body 3 that has obtained the thrust in this way reciprocates, the piston 31 housed in the cylinder space also reciprocates in the cylinder.

An alternating current is also applied to the coil 55a on the expansion section 50 side. As a result, the movable body 52 reciprocates with a thrust, so that the expansion piston 52a in the expansion cylinder 51 also reciprocates in the expansion cylinder 51.

The opposed piston 31 and piston 3
1 ′ reciprocates in the same cycle and the same phase. That is,
When the piston 31 moves to the left side in the drawing and reaches the reciprocating top dead center, the piston 31 'moves to the right in the drawing and reaches the reciprocating top dead center, and the piston 31 moves to the right side in the drawing and reciprocates at the bottom dead center. , The piston 31 'has moved to the left most in the drawing and has reached the reciprocating bottom dead center.

By operating the reciprocating operation of the expansion piston 52a in the expansion cylinder 51 by 90 ° earlier than the reciprocating operation of the piston 31 and the piston 31 'in the cylinder space, the working gas in the working space undergoes a Stirling cycle. And adiabatic expansion in the expansion space G to generate refrigeration, and heat in the expansion space G is pumped up and stored in the regenerator 5.
From the high temperature end of 2b, it is released to the outside via the fin 53.
The refrigeration generated in the expansion space G is transmitted to the cold head 59, and the object to be cooled (not shown) that is in thermal contact with the cold head 59 is cooled.

Next, the current path of the alternating current supplied to the linear motor compressor 1 in the Stirling refrigerator 100 operating as described above will be described.

The current path of the alternating current includes a first current lead system 19a flowing from the power supply 17 to the coil 5b and a coil 5b.
b, and a second current lead system 19b flowing from the coil 5b to the power supply 17. In this example, the first current lead system 19a and the second current lead system 1
9b is collectively referred to as a current lead system 19.

First, the first current lead system 19a will be described.

The current supplied from the power source 17 flows through the first electric wire 18a from one output terminal 17a, and the first electric wire 18a
The power is transmitted from the end of “a” to the outer peripheral side second conductive ring spacer 11-2 connected to the end by solder. The outer peripheral side second conductive ring spacer 11-2 has a shape surface as shown in FIG. 6, and this surface comes into contact with the outer peripheral fixing portion 4a of the flexure bearing 4-8. Flexure bearing 4-
The electric current is transferred to the outer peripheral fixing portion 4a of the motor 8.

The current is further applied to the flexure bearing 4-8.
Is transmitted from the outer peripheral fixing portion 4a to the arm portion 4c and from the arm portion 4c to the inner peripheral fixing portion 4b. The inner peripheral side second conductive ring spacer 12-2 is in contact with the inner peripheral fixing portion 4b. Inner circumference second
The conductive ring spacer 12-2 has a shape surface as shown in FIG. 7, and this surface comes into contact with the inner peripheral fixing portion 4b of the flexure bearing 4-8. A current is transmitted to the inner peripheral side second conductive ring spacer 12-2 having a larger energized area.

The current transmitted as described above is further transmitted to the second electric wire 18b electrically connected by solder or the like at the current lead hole 12b of the inner peripheral side second conductive ring spacer 12-2. You. Since the second electric wire 18b is connected to one end of the coil 5b via the first passage 13 and the second passage 14 formed in the first flange portion 32b, current flows from the second electric wire 18b to one end 5c of the coil 5b. Is what you enter.

The above is the configuration of the first current lead system 19a. That is, the first current lead system 19a is connected to the first electric wire 1
8a, an outer peripheral side second conductive ring spacer 11-2, a flexure bearing 4-8, an inner peripheral side second conductive ring spacer 12-2, and a second electric wire 18b.

From the first current lead system 19a to the coil 5b
The entered current flows through the coil 5b. Coil 5b
When an electric current flows through the inside, an induction magnetic field is generated around the coil 5. The induced magnetic field interferes with the magnetic field generated by the permanent magnet 5a disposed on the outer peripheral side of the coil 5b, and the movable body 3 to which the coil 5b is connected receives a force in the axial direction of the coil 5b. In this case, since an alternating current is applied, this generated force becomes a reciprocating driving force of the movable body 3, and as a result, the movable body 3 is driven to reciprocate.

The current flowing through the coil 5b is
From the other end 5d to the second current lead system 19b. Hereinafter, the second current lead system 19b will be described.

The current flowing through the coil 5b is
Is transmitted to the third electric wire 18c connected to the other end of the wire. Third
The electric wire 18c is connected to the third flange 32b formed on the first flange portion 32b.
Passage 15 and fourth passage 16, flexure bearing 4-
7, 4-8, inner peripheral side insulating ring spacers 10-8, 10
-9, passing through the inner peripheral fixing hole of the inner peripheral second conductive ring spacer 12-2, being fixed to the current lead hole 12b of the inner peripheral first conductive ring spacer 12-1 by soldering or the like, and Since it is electrically connected to the one conductive ring spacer 12-1, the current is transferred from the third electric wire 18c to the inner peripheral first conductive ring spacer 12-1.

The inner circumferential first conductive ring spacer 12-1 has a shape surface as shown in FIG. 7, and this surface is in contact with the inner circumferential fixing portion 4b of the flexure bearing 4-7. Therefore, the current-carrying area is enlarged by the contacted surface, and the current is transmitted to the inner peripheral fixing portion 4b of the flexure bearing 4-7.

In the flexure bearing 4-7, the current is transmitted from the inner peripheral fixing portion 4b to the arm portion 4c and from the arm portion 4c to the outer peripheral fixing portion 4a. The outer peripheral side first conductive ring spacer 11-1 is in contact with the outer peripheral fixing portion 4a.
The outer peripheral side first conductive ring spacer 11-1 has a shape surface as shown in FIG.
7, the current-carrying area is enlarged by the contacted surface, and the current is transferred to the outer peripheral first conductive ring spacer 11-1.

Outer peripheral side first conductive ring spacer 11-1
Is electrically connected to the fourth electric wire 18d by solder or the like at the current lead hole 11b. Therefore, the current is transmitted to the fourth electric wire 18d via the solder. And
The current returns from the fourth electric wire 18d to the other output terminal 17b of the power supply 17.

The configuration of the second current lead system 19b has been described above. That is, the second current lead system 19b is connected to the third electric wire 1
8c, an inner peripheral first conductive ring spacer 12-1, a flexure bearing 4-7, an outer peripheral first conductive ring spacer 11-1, and 42 electric wires 18d.

Since the current from the power supply 17 is an alternating current, it flows periodically through two types of paths, the above-described current path and the reverse path.

The linear motor compressor 1 operating as described above
, The movable body 3 includes the second electric wire 18b and the third electric wire 1
8c are fixed at both ends thereof, so that the second electric wire 18b and the third electric wire 1
8c also reciprocates, and does not perform the operation of moving itself (the operation of moving the other end relatively to one end of the electric wire). Therefore, there is no need to worry about the durability of the electric wire, and the life of the electric wire can be extended.

As described above, according to the present embodiment, the cylinder unit 21 formed in the housing 2 and the piston 31 disposed reciprocally in the cylinder space formed in the cylinder unit 21 are provided. Movable body 3 and shaft hole 7 in the center
And an outer peripheral fixing portion 4a formed of a ring-shaped portion on the outer peripheral edge side and fixed to the yoke 6 in contact with the inner wall of the housing 2 and a ring-shaped portion on the central edge side around the shaft hole 7. The movable body 3 includes an inner peripheral fixed part 4b fixed to the piston rod 32, and an arm part 4c connecting the outer peripheral fixed part 4a and the inner peripheral fixed part 4b. 32, and the conductive flexure bearings 4, 4-1 to 4-
16 and outer peripheral fixing portion 4a of flexure bearing 4-8
The outer peripheral side second conductive ring spacer 11-2 as a first power supply body attached to the outer peripheral surface or the first electric power supply body attached to the outer peripheral fixing portion 4a of the flexure bearing 4-7. Outer conductive side first conductive ring spacer 11-1 and inner circumferential side second conductive ring spacer 12- as a second power supply body attached to the inner circumferential fixing portion 4b of the flexure bearing 4-8. 2, or the inner peripheral first conductive ring spacer 12-1 as a second power supply body, which is attached to the inner peripheral fixing portion 4b of the flexure bearing 4-7, and the permanent magnet 5a and the coil 5b. A drive system 5 for reciprocatingly driving the movable body 3 based on a thrust generated by applying an alternating current to the coil 5b;
A power supply 17 for supplying an alternating current to the coil 5b;
The alternating current supplied from the outer peripheral side second conductive ring spacer 11-2 (the outer peripheral side first conductive ring spacer 11-
1), flexure bearing 4-8 (flexure bearing 4-7), inner peripheral second conductive ring spacer 12-2
Since the linear motor compressor is provided with the current lead system 19 for energizing the coil 5b via the (inner peripheral side first conductive ring spacer 12-1), the alternating current supplied from the power source is changed to the outer peripheral second conductive ring spacer. Ring spacer 11-2 (outer peripheral first conductive ring spacer 11-1), flexure bearing 4-8 (flexure bearing 4-7), inner peripheral second
Since the coil is energized via the conductive ring spacer 12-2 (the inner circumferential first conductive ring spacer 12-1), the power supply 1
The alternating current supplied from 7 is a flexure bearing 4-
8 (flexure bearing 4-7), the energization area is enlarged by the outer peripheral side second conductive ring spacer 11-2 (outer peripheral side first conductive ring spacer 11-1) which comes into contact with the outer peripheral fixing portion 4a, and the outer peripheral fixing is performed. The arm 4c is transmitted from the outer fixed part 4a to the arm 4c, and the inner fixed part 4 of the flexure bearing 4-8 (flexure bearing 4-7) from the arm 4c.
A current is supplied to b. The electric current from the inner peripheral fixing portion 4b comes into contact with the inner peripheral fixing portion 4b and the inner peripheral second conductive ring spacer 12-2 (the inner peripheral first
The coil 5b is transferred to the conductive ring spacer 12-1) and is energized from the inner peripheral second conductive ring spacer 12-2 (the inner peripheral first conductive ring spacer 12-1).

Thus, flexure bearing 4-8
When the (flexure bearing 4-7) is used as a current supply path to the drive system, the outer peripheral side conductive ring spacer 11-2 (the outer peripheral side conductive ring spacer 11) as the first power supply body is used.
-1), the current-carrying area is enlarged, the current is passed to the flexure bearing 4-8 (flexure bearing 4-7), and the current from the flexure bearing 4-8 (flexure bearing 4-7) is reduced. The inner peripheral side second conductive ring spacer 12-2 (inner peripheral first conductive ring spacer 12-1) as a second power supply body enlarges the current-carrying area, and the inner peripheral side second conductive ring spacer 12-2 ( Since it is received by the inner peripheral side first conductive ring spacer 12-1), current is sufficiently transmitted, and drive failure of the linear motor compressor does not occur, so that the reliability of the linear motor compressor can be improved. Things.

The movable body 3 is supported by a plurality of flexure bearing groups 41 and 42 arranged in a stacked state so as to be movable in the axial direction. Then, the outer peripheral side first ring spacer 11-1 and the outer peripheral side second ring spacer 11-2 as the first power supply, and the inner peripheral first ring spacer as the second power supply.
Ring spacer 12-1, inner second ring spacer 1
2-2 also plays a role as a spacer for avoiding contact between the flexure bearings. For this reason, the power supply body can be multifunctional, which contributes to downsizing of the device.

The power supply 17 and the first current lead system 1
9a, the coil 5b, and the second current lead system 19b constitute a current circuit, and both the first current lead system 19a and the second current lead system 19b are in the flexure bearing group 41. Flexure bearings (flexure bearings 4-8 and 4-7) are used. Therefore, the first electric wire 18a and the fourth electric wire 18d connected to the power source 17 are provided.
Can penetrate the flexure bearing group 41 from the same direction, and can eliminate unnecessary wiring.

[0087]

As described above, according to the present invention, when the flexure bearing is used as a current supply path to the drive system, the current supply area is enlarged by the first power supply body, and current is received by the flexure bearing. In addition, the current from the flexure bearing is received by the second power supply body with the energized area expanded by the second power supply body, so that the current is sufficiently transmitted, and the drive failure occurs due to poor current supply to the linear motor compressor. And the reliability of the linear motor compressor can be improved.

[Brief description of the drawings]

FIG. 1 is a sectional view of a Stirling refrigerator using a linear motor compressor according to an embodiment of the present invention.

FIG. 2 is a plan view of a flexure bearing according to an embodiment of the present invention.

FIG. 3 is an enlarged cross-sectional view illustrating a configuration near a first housing space of the linear motor compressor according to the embodiment of the present invention.

FIG. 4 is a plan view of an outer insulating ring spacer according to an embodiment of the present invention.

FIG. 5 is a plan view of an inner peripheral insulating ring spacer according to the embodiment of the present invention.

FIG. 6 is a plan view of an outer conductive ring spacer according to an embodiment of the present invention.

FIG. 7 is a plan view of an inner peripheral side conductive ring spacer according to the embodiment of the present invention.

FIG. 8 is a diagram showing a configuration near a flexure bearing group 41 in the embodiment of the present invention, and is a diagram showing a fixed state of an outer peripheral fixed portion and an inner peripheral fixed portion.

FIG. 9 is an enlarged view of a configuration near a flexure bearing group 41 in FIG.

FIG. 10 is a diagram showing a linear motor compressor according to the related art.

FIG. 11 is a plan view of a flexure bearing according to the related art.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Linear motor compressor 2 ... Housing, 21 ... Cylinder part, 22 ...
1st housing part, 23 ... 2nd housing part 3, 3 '... movable body, 31, 31' ... piston,
32, 32 '... piston rod, 33, 33' ...
・ Flange part 4, 4-1, 4-2, 4-3, 4-4, 4-5, 4-
6, 4-7 (current lead system), 4-8 (current lead system), 4-9, 4-10, 4-11, 4-12, 4-1
3, 4-14, 4-15, 4-16: flexure bearing, 4a: outer peripheral fixing part, 4b: inner peripheral fixing part, 4c: arm part, 4d: outer peripheral fixing Hole, 4e ...
・ Inner circumference fixing hole, 4f ・ ・ ・ Slits 41, 42, 43, 44 ・ ・ ・ Flexure bearing group 5,5 ′ ・ ・ ・ Drive system, 5a, 5′a ・ ・ ・ Permanent magnet,
5b, 5'b ... coil 6 ... yoke 7 ... shaft hole 8 ... working gas passage 9 ... outer ring spacer, 9a ... outer fixing hole 10 ... inner side Ring spacer, 10a ... inner peripheral fixing hole 11 ... outer peripheral side conductive ring spacer, 11a ... outer peripheral fixing hole, 11b ... current lead hole 11-1 ... outer peripheral side first conductive ring spacer ( 11-2: outer peripheral side second conductive ring spacer (first power supply body) 12: inner peripheral side conductive ring spacer, 12a: inner peripheral fixing hole, 12b: current lead Hole 12-1: inner peripheral first conductive ring spacer (second power supply) 12-2: inner peripheral second conductive ring spacer (second power supply) 13: first passage 14 ..Second passage 15 Third passage 16 Fourth passage 17 Power supply 1 a ··· one output terminal, 17b ·
..The other output terminal 18a... First electric wire (current lead system), 18b.
2nd electric wire (current lead system), 18c ... third electric wire (current lead system), 18d ... 4th electric wire (current lead system) 19 ... current lead system, 19a ... first electric current Lead system, 19b: second current lead system 50: expansion unit 51: expansion cylinder 52: movable body 54: housing 55: drive system 100: Stirling refrigerator C ... compression space, G ... expansion space

Claims (2)

[Claims] 1. A cylinder formed in a housing, a movable body disposed reciprocally in the cylinder, a shaft hole in a center portion, and a ring-shaped portion on an outer peripheral edge side, the housing being formed by the housing. Connecting the outer peripheral fixing portion fixed in the inside, the inner peripheral fixing portion formed of a ring-shaped portion on the center edge side around the shaft hole and fixed to the movable body, and the outer peripheral fixing portion and the inner peripheral fixing portion. A conductive flexure bearing that supports the movable body by inserting the movable body into the shaft hole, and a second flexure bearing that is attached to the outer peripheral fixing portion of the flexure bearing with a surface contact. (1) a power supply, a second power supply attached to the inner peripheral fixing portion of the flexure bearing in a surface-contact manner, and a permanent magnet and a coil, based on a thrust generated by applying an alternating current to the coil. Said A drive system for reciprocatingly driving a moving body, a power supply for supplying an alternating current to the coil, and an alternating current supplied from the power supply to the coil via the first power supply, the flexure bearing, and the second power supply. A linear motor compressor equipped with a current lead system for energizing. 2. The linear motor compressor according to claim 1, wherein the conductive flexure bearing is formed of an iron-based metal including steel and stainless steel.