JP2006280156A - Linear motor, linear compressor using the same, and cold accumulating refrigerator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a linear motor capable of remarkably reducing vibration and also achieving a cost reduction, and to provide a linear compressor using the same. <P>SOLUTION: The linear motor 100A has a stator 110 which is constituted of a yoke 111, coils 121, 122 wound around teeth 111a, 111b which project from the yoke 111, and permanent magnets 141a, 141b, 141c, 142a, 142b, 142c which are arranged at the tip end of the teeth 111a, 111b. Furthermore, the linear motor has a mobile body 130 arranged in a space 120 held between the teeth 111a, 111b. The mobile body 130 has a first moving segment 131 and a second moving segment 132 each reciprocating in the opposite direction with each other in the axial O direction of the stator 110. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a linear motor, a linear compressor, and a cold storage type refrigerator, and more particularly to a linear motor, a linear compressor, and a cold storage type refrigerator that can reduce vibration.

For example, linear motors are used in refrigerator compressors (pressure vibration sources), fuel pumps, oil pumps, and the like. As a structure of such a linear motor, for example, one having a stator provided with a coil and a mover provided so as to be able to reciprocate along a central axis, as disclosed in Patent Document 1 below. Is common. However, since the moving direction is one direction along the central axis, there is a problem that vibration easily occurs with the movement of the mover. In order to reduce this vibration, for example, a balancer is provided as disclosed in Patent Document 2 below, or two linear motors are arranged so that the respective movers face each other, and the respective movers are opposed to each other. There is a technique to move it in the direction.
JP 2004-056772 A Japanese Patent Laid-Open No. 2003-278652

  However, in the technique of attaching a balancer as described above, only a spring and a member having a predetermined mass are used as the balancer. In order to sufficiently reduce the vibration of the linear motor, the spring constant or member of the spring is used. Therefore, it is difficult to sufficiently reduce the vibration of the linear motor. In the technique in which two linear motors are arranged so that the respective movers face each other and the respective movers are moved in opposite directions, the vibration of the motor is certainly reduced, but two linear motors are provided. There is a problem that an increase in cost is unavoidable.

  The present invention has been made in view of the above-described situation, and a linear motor that can sufficiently reduce vibration and can reduce costs, a linear compressor using the linear motor, and a regenerative refrigerator are provided. The issue is to provide.

  In order to solve the above-mentioned problem, a linear motor according to claim 1 is a stator, a movable body that is reciprocally movable in a predetermined direction with respect to the stator, and either the stator or the movable body. A coil that generates a magnetic field in at least one of the stator and the movable body when energized, and is disposed in either the stator or the movable body. In the linear motor having a permanent magnet that generates a magnetic force that urges the movable body in the predetermined direction between the stator and the movable body by acting on the generated magnetic field, the movable body includes: It has at least two movers that are energized by the magnetic force so as to move in opposite directions in the predetermined direction when the coil is energized.

  Furthermore, the linear motor according to claim 2 is the linear motor according to claim 1, wherein the stator includes a permanent magnet disposed so as to face the movable body, and the movable body is at least partially. The coil has an iron-based member, and the coil forms a magnetic field in a predetermined direction on the iron-based member of the movable body when energized.

  Furthermore, the linear motor according to claim 3 is the linear motor according to claim 1, wherein the stator has a yoke disposed so as to face the movable body, and the coil is energized to the yoke by energization. It forms a magnetic field in a predetermined direction, and the movable body has a permanent magnet that acts on the magnetic field formed on the yoke.

  Furthermore, the linear motor according to claim 4 is the linear motor according to claim 3, wherein the movable body has at least a portion of an iron-based member, and the coil is energized so that the iron-based member of the movable body is energized. It forms a magnetic field in a predetermined direction.

  Furthermore, the linear motor of Claim 5 (henceforth 1st Embodiment) is a linear motor of Claim 1, The said stator opposes the said movable body in the said predetermined direction one side of the said stator. And a second magnetic pole disposed on the other side in the predetermined direction of the stator so as to face the movable body, and the movable body includes a first magnetic pole disposed on the coil. When a current in one direction is energized, it is attracted to the first magnetic pole, and when a current in a second direction opposite to the first direction is energized to the coil, it is energized in a direction away from the first magnetic pole. The first mover is attracted to the second magnetic pole when a current in the first direction is applied to the coil, and away from the second magnetic pole when the current in the second direction is applied to the coil. A second mover that is biased.

  Furthermore, the linear motor according to claim 6 is the linear motor according to claim 5, wherein the stator forms a hollow space along the predetermined direction, and the first and second magnetic poles are the hollow The movable body is arranged in parallel in the predetermined direction on the wall surface of the stator forming a space, and the movable body has the first movable element facing the first magnetic pole and the second movable element is It is arranged in parallel along the predetermined direction in the hollow space so as to face the second magnetic pole.

  A linear motor according to a seventh aspect is the linear motor according to the fifth or sixth aspect, wherein, in the first mode of the present invention, the stator is configured such that when the current in the second direction is supplied to the coil, the first motor is the first motor. It has a third magnetic pole for attracting one mover and a fourth magnetic pole for attracting the second mover when a current in the second direction is applied to the coil.

  The linear motor according to claim 8 is the linear motor according to claim 7, wherein the third magnetic pole and the fourth magnetic pole are the same magnetic pole. In this case, the third magnetic pole and the fourth magnetic pole may be disposed between the first magnetic pole and the second magnetic pole in the predetermined direction. Furthermore, it is preferable that the magnetic pole is constituted by a permanent magnet disposed at a position facing the movable body of the stator.

  A linear motor according to a ninth aspect (hereinafter, referred to as a first embodiment modification 1) is the linear motor according to the first aspect, wherein the stator faces the movable body at a central portion of the stator. The movable body is urged to one side in a predetermined direction of the stator by a repulsive force from the central magnetic pole when a current in the first direction is supplied to the coil. A first mover attracted to the central magnetic pole when a current in a second direction opposite to the first direction is applied to the coil; and the central magnetic pole when a current in the first direction is applied to the coil. And a second mover attracted to the central magnetic pole when the coil is energized with the current in the second direction by the repulsive force from the stator. .

  A linear motor according to a tenth aspect is the linear motor according to the ninth aspect, wherein the stator forms a hollow space along the predetermined direction, and the central magnetic pole is formed of the stator that forms the hollow space. The movable body is arranged on the wall surface, and the movable body is juxtaposed in the hollow space so that the outer peripheral surface of the first movable element and the outer peripheral surface of the second movable element face the central magnetic pole. It is what.

  A linear motor according to an eleventh aspect is the linear motor according to any one of the fifth to tenth aspects, wherein the stator is disposed so as to face each other with the movable body interposed therebetween, and acts as the magnetic pole on a surface facing the movable body. A pair of tooth portions each having a permanent magnet disposed thereon, and the coil is wound around each of the pair of tooth portions; and the movable body includes the first mover between the pair of tooth portions. And the second movable element are arranged.

  A linear motor according to a twelfth aspect (hereinafter referred to as a first embodiment modification 2) is the linear motor according to any one of the fifth to tenth aspects, wherein the stator faces each other with the movable body interposed therebetween. The first pair of tooth portions, each having a permanent magnet that acts on the magnetic pole on the surface facing the movable body, and the movable body is disposed so as to face each other across the movable body. And a second pair of tooth portions formed by arranging permanent magnets that act on the magnetic poles on the surface facing each other, and the coils are wound around each of the tooth portions, The movable body is configured such that the first movable element is disposed between the first pair of tooth portions, and the second movable element is disposed between the second pair of tooth portions.

  The linear motor according to claim 13 (hereinafter referred to as a second embodiment) is the linear motor according to claim 5, wherein the stator has a cylindrical shape with the predetermined direction as an axis, and the first magnetic pole and The second magnetic pole is disposed over a circumferential direction centered on the axis of the stator, and the movable body includes the first magnetic pole and the second movable element. The first mover is arranged in parallel along a circumferential direction centering on the axis of the stator so as to face both of the second magnetic poles, and the current in the first direction is passed through the coil. The second mover is biased toward the second magnetic pole when a current in the second direction is applied to the coil. .

  A linear motor according to a fourteenth aspect is the linear motor according to the thirteenth aspect, in which the coil is wound around the axis of the stator, and the first magnetic pole and the second magnetic pole are energized to the coil. The first mover and the second mover are permanent magnets having opposite polarities in the radial direction around the axis of the stator, and the first mover and the second mover are magnetized to have opposite polarities. The polarity of the side facing the stator of the mover is different from the polarity of the side facing the stator of the second mover.

  The linear motor according to claim 15 (hereinafter referred to as a third embodiment) is the linear motor according to claim 1, wherein the stator has a cylindrical shape with the predetermined direction as an axis, and the shaft of the stator The movable body has a first magnetic pole and a second magnetic pole arranged side by side along a circumferential direction centered on the stator, and the movable body faces the first magnetic pole in a radial direction centered on the axis of the stator. And a second mover disposed so as to face the second magnetic pole in a radial direction centered on the axis of the stator, and the first mover The second mover is arranged side by side in a circumferential direction centering on the axis of the stator, and the first mover energized the coil in a first direction. When receiving a repulsive force from the first magnetic pole, the stator moves to one side in a predetermined direction of the stator, and the coil is moved to the first direction. When the current in the second direction opposite to that is applied, the magnetic force is received from the first magnetic pole and moves to the center side of the stator, and the second mover moves the coil in the first direction. When the current is supplied, a repulsive force is received from the second magnetic pole, and the stator moves to the other side in the predetermined direction. When the current in the second direction is supplied to the coil, the second magnetic pole attracts the second magnetic pole. It receives force and moves to the center side of the stator.

  The linear motor according to claim 16 is the linear motor according to claim 15, wherein the stator protrudes opposite to the movable body and is arranged in parallel in a circumferential direction centering on the axis of the stator. A second tooth portion, and the coils are wound around the first tooth portion and the second tooth portion to constitute the first magnetic pole and the second magnetic pole, respectively. The second magnetic pole is magnetized to have opposite polarities when a current in the first direction or the second direction is applied to the coil, and the movable body is a shaft of the stator. A permanent magnet whose polarity is reversed in the radial direction centered on the first mover, the polarity on the side facing the first magnetic pole of the first mover and the side facing the second magnetic pole of the second mover The polarity is different.

  In order to solve the above-mentioned problem, a linear compressor according to the present invention described in claim 17 includes a cylinder and two pistons arranged in the cylinder so as to be reciprocable in the axial direction of the cylinder, A linear motor coupled to the piston and reciprocatingly moving the piston, wherein the linear motor according to any one of claims 1 to 13 is used as the linear motor, It has the 1st piston connected to the 1st above-mentioned mover, and the 2nd piston connected to the 2nd above-mentioned mover of the above-mentioned linear motor.

  In order to solve the above problems, a regenerator type refrigerator of the present invention described in claim 18 includes a pressure vibration source that generates pressure vibration of the working gas, and a low temperature that generates a low temperature by expansion and contraction of the working gas. 18. A generator, and a phase adjusting mechanism that adjusts a phase of a pressure vibration of the working gas generated by the pressure vibration source and a displacement vibration of the working gas, wherein the pressure vibration source is defined in claim 17. The linear compressor is provided.

  As described above, the linear motor according to the present invention is such that a movable body provided to be movable in a predetermined direction with respect to the stator moves at least on the opposite side in the predetermined direction by a magnetic force generated by energizing the coil. It has two movers. Therefore, the vibration accompanying the movement of the movable body is canceled by the two moving toward the opposite sides. Therefore, the vibration of the linear motor can be reduced without using a means such as providing a balancer in the linear motor or disposing two linear motors so that the movable bodies of the linear motors face each other. In addition, according to such means according to the present invention, since two linear motors and balancers are not required, the number of parts can be reduced and the cost can be reduced.

  The linear compressor of the present invention uses the linear motor of the present invention as a linear motor for driving the piston, and has a first piston and a second piston respectively connected to the two movers. . Therefore, it is possible to realize a state in which the first piston and the second piston move in opposite directions in the axial direction of the cylinder by driving the linear motor. Therefore, since the vibration accompanying the movement of the piston is canceled by the symmetrical movement of the first piston and the second piston, the vibration of the entire linear compressor can be suppressed. In the linear compressor of the present invention, since the first piston and the second piston can be driven by the same linear motor, the first piston and the second piston are moved as in the technique of Reference 2. There is no need to prepare each linear motor independently. Therefore, it is possible to contribute to the reduction of the number of parts of the linear compressor and the cost.

  In this case, when a permanent magnet is arranged on the stator and the movable body has an iron-based member at least in part, when a current is passed through the coil, The movable body can be moved by the action of the generated magnetic field and the permanent magnet. In addition, a yoke is disposed on the stator so as to face the movable body, and a permanent magnet is disposed at a position facing the yoke of the movable body. The movable body can be moved by the action of the generated magnetic field and the permanent magnet of the movable body. Furthermore, when a permanent magnet is disposed on the movable body, an iron-based member is disposed on at least a part of the movable body in addition to the permanent magnet, so that when a current is supplied to the coil, the iron-based member of the movable body By generating a magnetic field, the movable body can be moved by the action of the magnetic field generated in the iron-based member of the stator and the iron-based member of the movable body and the permanent magnet. Thereby, a much stronger driving force can be obtained.

  Furthermore, in the first embodiment of the linear motor of the present invention described above, the first magnetic pole is disposed on one side in the predetermined direction of the stator, and the second magnetic pole is disposed on the other side in the predetermined direction. When a first mover facing the first magnetic pole and a second mover facing the second magnetic pole are employed, and when a current in the first direction is applied to the coil, the first mover and When the second mover is attracted to the first magnetic pole and the second magnetic pole, respectively, and when a current in the second direction is applied to the coil, the first mover and the second mover become the first magnetic pole and the second magnetic pole. Are separated from each other. According to such a configuration, by changing the direction of the current flowing in the coil, the moving direction of the movable body is reversed, and further, the current in either the first direction or the second direction is applied to the coil. Even when energized, the moving direction of the first mover and the second mover can always be opposite in the predetermined direction. Further, similar to the configuration of the conventional linear motor, the movable body is attracted to the magnetic pole or separated from the magnetic pole, and a configuration in which the two movable elements move in the opposite directions relatively easily is realized. Can do.

  In the first embodiment of the linear motor of the present invention, the first magnetic pole and the second magnetic pole are arranged in parallel along a predetermined direction on the wall portion of the stator that forms the hollow space. The first movable element is arranged in parallel in the hollow space so that the outer peripheral surfaces of the first magnetic pole and the second magnetic pole face each other. And the second mover can be arranged in one hollow space. Therefore, it is possible to contribute to the miniaturization of the linear motor while reducing the vibration of the linear motor. Also, by arranging two movers that move in opposite directions in one hollow space, the contrast of the movement of the two movers is improved, and there is a further effect by reducing the vibration of the linear motor.

  In the first embodiment of the linear motor of the present invention, the third magnetic pole and the fourth magnetic pole that respectively attract the first and second movers when a current in the second direction is applied to the coil. Furthermore, since the first movable element and the second movable element can be attracted to the magnetic poles regardless of whether the coil is supplied with the current in the first direction or the second direction, the movable body reciprocates. The thrust required for the motor can be increased, contributing to the improvement of the performance of the linear motor. In this case, by making the third magnetic pole and the fourth magnetic pole the same magnetic pole, the linear motor can be made compact while reducing the vibration of the linear motor. In this case, it is desirable that the magnetic poles configured as the third magnetic pole and the fourth magnetic pole are disposed between the first magnetic pole and the second magnetic pole in a predetermined direction.

  In the first modification of the first embodiment of the present invention, the central magnetic pole is disposed at the center in the predetermined direction of the stator, and the first movable element and the second movable element are disposed at both ends of the central magnetic pole, When the coil is energized with the first current, each mover is separated from the center magnetic pole by the repulsive force from the center magnetic pole, and when the coil is energized with the second current, the mover is moved to the center magnetic pole. To suck. According to such a configuration, if only the central magnetic pole is disposed as the magnetic pole formed on the stator, a sufficient function can be achieved as a linear motor, the configuration is simple, and the cost can be reduced.

  Moreover, in 1st Embodiment and 1st Embodiment modification 1 of this invention, a pair of tooth part arrange | positioned on both sides of a movable body is formed in a stator, and a coil is formed in this tooth part. In addition to winding, a permanent magnet can be arranged on one side in the predetermined direction and the other side in the predetermined direction of the surface facing the movable body, or on the central side in the predetermined direction to form the magnetic pole. Moreover, a 1st needle | mover and a 2nd needle | mover can be arrange | positioned between these pairs of tooth parts. According to this, each mover can be moved in the reverse direction with a small number of tooth portions, and the function of the present invention can be realized with a simpler configuration.

  Further, in the first embodiment modification 2 of the present invention, as a stator, a first pair of tooth portions and a second pair of tooth portions are arranged side by side in a predetermined direction, and the plurality of tooth portions are arranged in parallel. Since each of the coils is wound, the first mover is disposed between the first pair of tooth portions, and the second mover is disposed between the second pair of tooth portions. Each mover can be moved by a pair of tooth portions. According to this, the thrust for moving each mover can be improved, which contributes to the performance improvement of the linear motor.

  In the second embodiment of the present invention, the first magnetic pole and the second magnetic pole are juxtaposed along the axial direction of the stator, and are arranged over the circumferential direction centered on the axis of the stator. Moreover, the 1st needle | mover and the 2nd needle | mover are arranged in parallel along the circumferential direction of this stator, and the 1st needle | mover and the 2nd needle | mover are each reverse by the electricity supply to a coil. Will move. Thus, since the 1st needle | mover and the 2nd needle | mover are arranged in parallel by the circumferential direction centering on the axis | shaft of a stator, the 1st needle | mover is reduced, reducing the axial direction length of a stator. And the second mover can be reciprocated in opposite directions in the axial direction of the stator. That is, vibration generated in the linear motor can be reduced with a more compact configuration.

  In the third embodiment of the present invention, the first magnetic pole and the second magnetic pole are juxtaposed along the circumferential direction around the stator axis. Further, the first mover and the second mover are juxtaposed along the circumferential direction of the stator so as to face the first magnetic pole and the second magnetic pole, respectively. In addition, the first mover and the second mover move in opposite directions in the axial direction of the stator by energizing the coil. According to such a configuration, since each magnetic pole and each mover are arranged side by side along the circumferential direction of the stator, the axial length of the stator is further increased. The first mover and the second mover can be reciprocated in directions opposite to each other in the axial direction of the stator while reducing. That is, vibration generated in the linear motor can be reduced with a more compact configuration.

(Linear motor)
Embodiments of a linear motor according to the present invention will be described below with reference to the accompanying drawings.

First Embodiment FIG. 1 illustrates an outline of a linear motor 100A according to a first embodiment of the present invention. FIG. 1A is a cross-sectional view of the linear motor 100A, and in particular, is a cross-sectional view taken along the line BB of FIG. Moreover, FIG.1 (b) is an AA arrow line view of Fig.1 (a). As shown in FIG. 1, the linear motor 100A is arranged in a stator 110 and a hollow space 120 formed by the stator 110 so as to be reciprocable in a predetermined direction with respect to the stator, and is made of a magnetic member. Arranged on the movable body 130 and the stator 110, coils 121 and 122 that generate a magnetic field in the stator 110 and the movable body 130 by energization, and the wall 110a that forms the hollow space 120 of the stator 110, Permanent magnets 141 a, 141 b, 141 c, 142 a, 142 b, 142 c that act on the magnetic field generated by the coil 121.

  Here, the movable body 130 is arranged such that the axis O of the movable body 130 and the axis O of the stator 110 are the same, and the direction of the axis O (hereinafter referred to as the axial direction) is a predetermined direction. As reciprocating motion. The movable body 130 includes two movable elements 131 (first movable element) and 132 (second movable element) arranged in parallel in the axial direction, and when a current is passed through the coils 121 and 122. The mover 131 and the mover 132 move in the opposite directions in the axial direction. In the present embodiment, the movers 131 and 132 have the same shape and the same mass.

  The stator 110 has a yoke 111 that constitutes the housing of the linear motor 100 </ b> A, and two tooth portions 111 a and 111 b are formed on the yoke 111 so as to protrude toward the hollow space 120. The tooth portions 111a and 111b are arranged so as to face each other with the movable body 130 interposed therebetween, and a pair of tooth portions is formed by the tooth portions 111a and 111b. A coil 121 is wound around the tooth portion 111a of the yoke 111, and a coil 122 is wound around the tooth portion 111b. Further, wall portions 110a that form the hollow space 120 are formed by the inner peripheral surfaces of the tooth portions 111a and 111b, and permanent magnets 141a and 142a as first magnetic poles are formed on the inner peripheral surfaces of the tooth portions 111a and 111b. 141b and 142b as the third magnetic pole, the fourth magnetic pole or the central magnetic pole, and 141c and 142c as the second magnetic pole are respectively disposed. In the present embodiment, the stator 110 is constituted by the yoke 111, the coils 121 and 122, and the permanent magnets 141a, 141b, 141c, 142a, 142b, and 142c. As a material constituting the yoke 111, a paramagnetic material can be employed, and in particular, a ferromagnetic material or a soft magnetic material can be employed. Among these, it is desirable to employ a soft magnetic material because of its high response to changes in the magnetic field. Examples of the paramagnetic material include iron-based materials.

  Further details regarding the stator 110 will be described. As shown in FIG. 1A, permanent magnets 141a, 141b, and 141c are arranged in the axial direction on the inner peripheral surface 110a of the tooth portion 111a, and the permanent magnet 142a is provided on the inner peripheral surface 110b of the tooth portion 111b. , 142b, 142c are arranged in parallel in the axial direction. Further, the permanent magnets 141a and 142a, the permanent magnets 141b and 142b, and the permanent magnets 141c and 142c are arranged at positions facing each other with the movable body 130 interposed therebetween. The permanent magnets 141a and 142a are disposed on one axial side of the stator 110 (left side in FIG. 1A), and the permanent magnets 141c and 142c are disposed on the other axial side of the stator 110 (FIG. 1 ( In a), it is arranged on the right side). The permanent magnets 141b and 142b are disposed in the center of the stator 110 in the axial direction, and are sandwiched between the permanent magnets 141a and 142a and the permanent magnets 141c and 142c, respectively. Further, these permanent magnets have different polarities in the radial direction centered on the axis O of the movable body 130 and the stator 110. In other words, the polarities are different between the tooth portion side and the movable body side. In addition, the permanent magnets adjacent in the axial direction are arranged so that the polar states are mutually different, and the permanent magnets facing each other across the movable body 130 are arranged so that the polarities of the facing surfaces are different from each other. Yes. Specifically, in the permanent magnets 141a, 141c, and 142b, the polarity on the tooth portion 111a or 111b side is N pole and the polarity on the movable body 130 side is S pole, and in the permanent magnets 141b, 142a, and 142c, The tooth portion 111a or 111b side has an S pole and the movable body 130 side has an N pole. In addition, this invention is not restricted to this, It is also possible to set the polarity of a permanent magnet so that it may be contrary to embodiment shown in FIG.

  Next, the movable body 130 will be described. In the movable body 130, of the two movable elements arranged in parallel in the axial direction, the movable element 131 is arranged such that the outer peripheral surface 131a faces the permanent magnets 141a and 142a and the permanent magnets 141b and 142b, respectively. The movable element 132 is arranged so that the outer peripheral surface 132a thereof faces the permanent magnets 141c and 142c and the permanent magnets 141b and 142b, respectively. In other words, the mover 131 is disposed in the hollow space 120 on one side in the axial direction (right side in FIG. 1A), and the mover 132 is placed in the hollow space 120 in the other side in the axial direction (FIG. 1 ( a) on the left side of a). The movers 131 and 132 are configured as cylindrical members having hollow portions. In a state where no current is supplied to the coil, the movers 131 and 132 are respectively positioned in a space where one end in the axial direction is sandwiched between the permanent magnets 141a and 142a or a space sandwiched between the permanent magnets 141c and 142c. The ends are arranged so as to be located in the spaces between the permanent magnets 141b and 142b. In other words, the movers 131 and 132 are arranged so as to straddle the boundary between the permanent magnets arranged side by side in the axial direction. As a material constituting the movers 131 and 132, a paramagnetic material can be employed, and in particular, a ferromagnetic material or a soft magnetic material can be employed. Among these, it is desirable to employ a soft magnetic material because of its high response to changes in the magnetic field. Examples of the paramagnetic material include iron-based materials.

  Next, the operation of the linear motor 100A as described above will be described. First, a current in the first direction as shown in FIG. In this case, in the present embodiment shown in FIG. 1, currents in the same direction are passed through the coils 121 and 122. In addition, that the current in the same direction is energized means that the current is energized in the same direction in the circumferential direction around the AA line (BB line) in FIG. In the present embodiment, the current in the first direction is a current that is energized from the front of the paper to the back of the paper in the right part of FIG. When the current in the first direction is thus applied to the coils 121 and 122, the coils 121 and 122 generate a magnetic field from the lower side to the upper side in FIG. 1, as shown in FIG. This magnetic field acts on the movable body 130 arranged in the hollow space 120 of the stator 110, and the movable elements 131 and 132 are magnetized as shown in FIG. Specifically, the upper surfaces of the movers 131 and 132 are N, and the lower surfaces of the movers 131 and 132 are S. Thereby, the mover 131 receives an attractive force from the permanent magnets 141a and 142a and receives a repulsive force from the permanent magnets 141b and 142b. Therefore, the mover 131 as the first mover moves toward the permanent magnets 141a and 142a in the axial direction. On the other hand, the mover 132 receives an attractive force from the permanent magnets 141c and 142c and receives a repulsive force from the permanent magnets 141b and 142b. Therefore, the mover 132 as the second mover moves toward the permanent magnets 141c and 142c in the axial direction. As described above, when a current in the first direction is supplied to the coils 131 and 132, the movers 131 and 132 move in directions opposite to each other in the axial direction, and specifically move away from each other.

  Subsequently, a current in a second direction opposite to the first direction is passed through the coils 131 and 132. When the current in the second direction is applied to the coils 121 and 122, the coils 121 and 122 generate a magnetic field in the direction opposite to the direction shown in FIG. 1 (that is, the direction from the top to the bottom in FIG. 1). To do. As a result, the movers 131 and 132 are magnetized with the opposite polarity to that shown in FIG. Specifically, the upper surfaces of the movers 131 and 132 are S, and the lower surfaces of the movers 131 and 132 are N. Thereby, the mover 131 receives a repulsive force from the permanent magnets 141a and 142a and receives an attractive force from the permanent magnets 141b and 142b. The mover 132 receives a repulsive force from the permanent magnets 141c and 142c, and receives an attractive force from the permanent magnets 141b and 142b. Therefore, the mover 131 as the first mover and the mover 132 as the second mover both move toward the permanent magnets 141b and 142b in the axial direction (that is, the axially central side of the stator 110). become. Thus, when the current in the second direction is supplied to the coils 131 and 132, the movers 131 and 132 move in directions opposite to each other in the axial direction, specifically, move closer to each other.

  As described above, in the linear motor 100A according to the present embodiment, when the AC current is supplied to the coils 121 and 122, the movers 131 and 132 reciprocate in opposite directions in the axial direction. Therefore, the vibration accompanying the movement of the movers 131 and 132 is canceled by the movement of the respective movers 131 and 132, and hence the vibration generated in the linear motor 110 can be reduced. Moreover, since the movers 131 and 132 are set to have substantially the same shape and substantially the same mass, the movers 131 and 132 are moved in contrast to the line AA in FIG. The vibration of the linear motor 100A can be further reduced. Further, since the linear motor is configured as one linear motor 100A, the number of components can be reduced as compared with the technique of reducing vibration by two linear motors, and the cost can be reduced.

(First Embodiment Modification 1) In the first embodiment of the linear motor of the present invention, a first embodiment modification 1 as shown in FIG. 2 may be employed. 2, components having the same configuration and function as those in FIG. 1 are given the same reference numerals, and descriptions thereof are omitted. In the linear motor 100B according to Modification 1 of the first embodiment shown in FIG. 2, the permanent magnets 141a, 142a on the one axial side and the other axial side of the stator 110 with respect to the linear motor 100A in FIG. 141c and 142c are not disposed, and the permanent magnets disposed on the stator 110 are only permanent magnets 141a and 141b disposed at the center in the axial direction of the stator 110. More specifically, a mover 131 as a first mover is disposed on one axial side (left side in FIG. 2) of the permanent magnets 141b and 142b configured as the central magnetic pole, and the permanent magnets 141b and 142b A mover 132 as a second mover is arranged on the other side in the axial direction (right side in FIG. 2).

  Next, the operation of the linear motor 100B shown in FIG. 2 will be described. First, when a current in the first direction similar to that in the case of FIG. 1 is supplied to the coils 121 and 122, a magnetic field in a direction as shown in FIG. 2 is generated. Thereby, the movers 131 and 132 are magnetized to the polarities shown in FIG. Therefore, the mover 131 moves to one side in the axial direction of the stator 110 to receive a repulsive force from the permanent magnets 141b and 142b. Similarly, since the mover 132 receives a repulsive force from the permanent magnets 141b and 142b, the mover 132 moves to the other side of the stator 110 in the axial direction. On the other hand, when a current in the second direction is passed through the coils 121 and 122, a magnetic field is generated in the direction opposite to that shown in FIG. Thereby, the movers 131 and 132 are magnetized to a polarity opposite to the polarity shown in FIG. Therefore, the movers 131 and 132 are attracted from the permanent magnets 141 c and 142 c and moved to the center side in the axial direction of the stator 110. As described above, when the currents in the first and second directions are alternately supplied to the coils 121 and 122, the movers 131 and 132 move in the opposite directions in the axial direction, like the linear motor 100A in FIG. Repeat approach and separation. Therefore, the vibration of the linear motor 100B can be reduced as in the case of FIG. Moreover, since the number of permanent magnets to be used can be reduced as compared with the linear motor 100A of FIG. 1, the cost can be further reduced.

(First Embodiment Modification 2) Furthermore, the first embodiment of the linear motor of the present invention can be modified as shown in a first embodiment modification 2 as shown in FIG. FIG. 3 shows a linear motor 200 according to Modification 2 of the first embodiment of the present invention. FIG. 3A is a cross-sectional view of the linear motor 200, in particular, an EE cross-sectional view of FIG. FIG.3 (b) is a C arrow directional view of Fig.1 (a). Components having the same configurations and functions as those in FIG. 1 are given the same reference numerals, and descriptions thereof are omitted. The linear motor 200 shown in FIG. 3 differs in the structure of the stator 210 with respect to the linear motor 100A of FIG. Specifically, the yoke 211 that constitutes the stator 210 is opposed to the first pair of tooth portions 211 a and 212 a that are disposed so as to face each other with the movable body 130 interposed therebetween, and to the yoke 211 that constitutes the stator 210. A second pair of tooth portions 211b and 212b arranged so as to be formed is formed. The first pair of tooth portions 211 a and 212 a and the second pair of tooth portions 211 b and 212 b are juxtaposed in the axial direction of the stator 210. Permanent magnets 241a and 241b are disposed on the surface of the tooth portion 211a facing the movable body 130, and permanent magnets 242a and 242b are disposed on the tooth portion 212a. Further, permanent magnets 241c and 241d are disposed on the surface of the tooth portion 211b facing the movable body 130, and permanent magnets 242c and 242d are disposed on the tooth portion 212b. Coils 221, 223, 222, and 224 are wound around these tooth portions 211a, 212a, 211b, and 212b, respectively.

  The permanent magnets 241a, 241b, 242a, 242b provided in parallel with the tooth portions 211a, 212a are set so that the polarities of the adjacent permanent magnets are opposite to each other, and are opposed to each other with the movable body 130 interposed therebetween. The polarity is set to be opposite. In addition, the polarities of the permanent magnets 241c, 241d, 242c, and 242d arranged in the tooth portions 211b and 212b have the same relationship.

  Next, the operation of the linear motor 200 shown in FIG. 3 will be described. First, a current in the first direction is passed through the coils 221, 223, 222, and 224. In the present embodiment, the current in the first direction is the direction of current as shown in FIG. That is, in the coils 221 and 223 or the coils 222 and 224 facing each other with the movers 131 and 132 interposed therebetween, currents in the same direction are applied and the coils 221 and 222 arranged along the axial direction of the stator. Or, the coils 223 and 224 are energized in the reverse direction. When such a current in the first direction is passed through the coils 221, 223, 222, and 224, a magnetic field directed from below to above is applied to the first pair of tooth portions 211a and 212a as shown in FIG. As a result, a magnetic field is generated in the second pair of tooth portions 211b and 212b from the top to the bottom as shown in FIG. Thereby, the movers 131 and 132 are magnetized as shown in FIG. Accordingly, the first mover 131 receives an attractive force from the permanent magnets 241a and 242a and receives a repulsive force from the permanent magnets 241b and 242b. Further, the second mover receives a repulsive force from the permanent magnets 241c and 242c and receives an attractive force from the permanent magnets 241d and 242d. For this reason, the 1st needle | mover 131 and the 2nd needle | mover move to a mutually reverse direction in the axial direction of a stator, specifically, the direction away.

  On the other hand, when a current in the second direction is applied to the coils 221, 223, 222, and 224, a magnetic field is generated in a direction opposite to that shown in FIG. 3, and as a result, the polarities of the magnetized movers 131 and 132 are also reversed. To do. Therefore, the first movable element 131 and the second movable element 132 move in the opposite direction to the above, specifically, in the direction approaching each other.

  Thereby, vibration generated in the linear motor 200 can be reduced. In this embodiment, since the two movers are moved by the multiple coils 221, 222, 223, and 224, the thrust of the mover can be improved.

(Modification 3 of the first embodiment) Further, the first embodiment of the linear motor of the present invention can be modified as shown in Modification 3 of the first embodiment as shown in FIG. FIG. 4 illustrates a linear motor 400 according to Modification 3 of the first embodiment. A linear motor 400 shown in FIG. 4 constitutes a housing of the linear motor 400, a yoke 411 formed in a cylindrical shape, and a coil 421 wound in a circumferential direction around the axis O of the yoke 411. A cylindrical back yoke 431 disposed on the inner peripheral surface side of the yoke 411 and having the same axis O as the axis, and a movable body disposed on the inner peripheral surface side of the yoke 411 and on the outer peripheral surface side of the back yoke 431 The movable elements 441 and 442 are included. In the present embodiment, a stator 410 is constituted by the yoke 411, the coil 421, and the back yoke 431.

  The yoke 411 of the stator 410 is reduced in diameter at both ends in the axis O direction to form flange portions 441a and 441b in the circumferential direction, and is enlarged in the center side in the axis O direction to form a recess 411c. A coil 421 wound around the recess 411c is disposed. When a current is passed through the coil 421, a magnetic field is generated in the flange portions 441a and 441b of the yoke 411, and the flange portions 441a and 441b are magnetized to act as the first magnetic pole or the second magnetic pole.

  On the other hand, the movers 441 and 441 are both formed in a ring shape with the axis O as the center, and are arranged so as to face the flange portions 411a and 411b of the yoke 411, respectively. Specifically, the first movable element 441 faces to face the flange portion 411a that acts as the first magnetic pole, and the second movable element 442 faces to face the flange portion 411b that acts as the second magnetic pole. It is like that. These movers 441 and 442 are composed of permanent magnets having different polarities in the radial direction around the axis O. In other words, the inner and outer peripheral sides of the ring-shaped movers 441 and 442 Are different in polarity. Here, the first mover 441 includes two movers 441a and 441b, and the polarities of the movers 441a and 441b are opposite to each other. The second mover 442 also includes two movers 442a and 442b, and the polarities of the movers 442a and 442b are opposite to each other. Further, the polar states of the first movable element 441 and the second movable element 442 are opposite to each other. In other words, the polarity direction of the mover 441b arranged on one side (right side in FIG. 4) of the first mover 441 and the other side (right side in FIG. 4) of the second mover 441 in the axis O direction. The direction of the polarity of 441b arranged in the direction opposite to the direction of the axis O of the first mover 441 and the direction of the polarity of the mover 441a arranged on the other side in the axis O direction of the first mover 441 The directions of the polarities of 441a arranged on one side of the direction are opposite to each other. Specifically, the polarities as shown in FIG. 4 are set, and the side of the movers 441a and 442b facing the yoke 411 is the N pole, and the side of the movers 441b and 442a facing the yoke 411 is S. It is considered as a pole.

  Next, the operation of the linear motor 400 as shown in FIG. 4 will be described. First, a current in the first direction is passed through the coil 421. In the present embodiment, the current in the first direction is a current in the direction as shown in FIG. 4. In the upper part of FIG. 4, the current flows from the front of the paper to the back of the paper, and in the lower part of FIG. Current flows from the front to the front of the page. According to this, a magnetic field as shown in FIG. 4 is generated in the yoke 411 and the back yoke 431, and the flange portions 441a and 441b are magnetized to the polarity as shown in FIG. Specifically, the flange portion 411a as the first magnetic pole is an N pole, and the flange portion 411b as the second magnetic pole is an S pole. Accordingly, the movers 441a and 442a receive a repulsive force from the magnetic poles, and the movers 441b and 442b receive an attractive force from the magnetic poles. Therefore, the first mover 441 and the second mover 442 are respectively It moves to both ends in the axial direction. On the other hand, when a current in the second direction opposite to the first direction is applied to the coil 421, a magnetic field in the direction opposite to that in FIG. 4 is generated in the yoke 411 and the back yoke 431. As a result, a phenomenon opposite to the above occurs, and the first movable element 441 and the second movable element 442 move to the axially central side of the stator 410, respectively.

  According to the present embodiment, when an alternating current is applied to the coil 421, the first mover 421 and the second mover 422 reciprocate in opposite directions in the axial direction. Therefore, the vibration accompanying the movement of the mover is canceled by the movement of each of the first mover 421 and the second mover 422, and the vibration of the entire linear motor 400 can be suppressed. Further, in the present embodiment, the first movable element 421 and the second movable element 422 can be driven only by supplying a current to one coil 421. Therefore, a circuit for supplying current to the coil is provided. The complexity can be avoided.

(2nd Embodiment) Next, 2nd Embodiment of the linear motor of this invention is described. FIG. 5 shows a linear motor 300 according to the second embodiment of the present invention. FIG. 5A is a cross-sectional view of the linear motor 300, and in particular, is a cross-sectional view taken along the line FF of FIG. 5B. FIG.5 (b) is a GG arrow line view of Fig.5 (a). The linear motor 300 includes a yoke 320 that forms a housing of the linear motor 300 and is formed in a cylindrical shape, a stator 310 having the yoke 320, and a radially inner portion centering on the axis O of the stator 310. A movable body 340 is disposed on the circumferential side so as to face the stator 310. A coil 321 is wound around the yoke 320 of the stator 310 in the circumferential direction about the axis O. Further, channels 311 a, 311 b, 311 c, and 311 d that are bent so as to cover the inner periphery of the coil 321 from both sides in the axial direction are disposed on the radially inner peripheral side of the yoke 320. In FIG. 3B, the same reference numerals are assigned to the channels arranged on the opposite side with the axis O as the center. Of these channels 311a, 311b, 311c and 311d, the channels 311a and 311c arranged on one side in the axial direction of the stator 310 (left side in FIG. 5A) are as shown in FIG. 5B. The stator 310 is juxtaposed in the circumferential direction around the axis O and acts as a second magnetic pole. On the other hand, the channels 311b and 311d arranged on the other axial side of the stator 310 (the right side in FIG. 5A) are also arranged in the circumferential direction around the axis O of the stator 310, as in FIG. 5B. They are arranged side by side and act as the first magnetic pole.

  The movable body 340 includes first movable elements 341a and 341c facing the channels 311a and 311b, and second movable elements 341b and 341d facing the channels 311c and 311d. As shown in FIG. 5B, the first mover 341a, 341c and the second mover 341b, 341d are the first mover and the second mover in the circumferential direction centered on the axis O. They are arranged side by side so as to be alternately arranged. The first movers 341a and 341c and the second movers 341b and 341d are composed of permanent magnets whose polarities are opposite in the radial direction around the axis O. More specifically, the channels 311a and 311b side of the first movers 341a and 341c are N poles, and the channels 311c and 311d sides of the second movers 341b and 341d are S poles.

  Next, the operation of the linear motor 300 shown in FIG. 5 will be described. First, a current in the first direction is passed through the coil 321. In the present embodiment, the current in the first direction is the current in the direction shown in FIG. 5. In other words, in the upper part of FIG. 5, the current flows from the front of the paper to the back of the paper, and in the lower part of FIG. This is a state in which a current flows in the direction. When the current in the first direction is applied to the coil 321 in this way, a magnetic field as shown in FIG. 5A is generated, and the channels 311a, 311b, 311c, and 311d are as shown in FIG. 5A. Magnetized. Specifically, the side of the channels 311a and 311c facing the movers 341a, 341b, 341c and 341d is the N pole, and the side of the channels 311b and 311d facing the movers 341a, 341b, 341c and 341d is the S pole.

  As a result, the first movers 341a and 341c are attracted to the channels 311b and 311d as the first magnetic poles and move to one axial side of the stator 310 (channels 311b and 311d). On the other hand, the second movers 341b and 341d are attracted to the channels 311a and 311d as the second magnetic poles and move to the other axial side of the stator 310 (channels 311a and 311c). Therefore, the first mover and the second mover move to the opposite sides in the axial direction of the stator 310. When a current in the second direction is supplied to the coil 321, a phenomenon opposite to the above description occurs, the first movers 341 a and 341 c move to the channels 311 a and 311 c, and the second movers 341 b and 341 d Move to the 311b, 311d side.

  As described above, in the present embodiment, the first mover 341a, 341c and the second mover 341b, 341d reciprocate in the opposite directions in the axial direction, so that the vibration of the linear motor 300 is reduced. Can do. Further, since the first movers 341a and 341c and the second movers 341b and 341d are arranged in parallel in the circumferential direction around the axis O of the stator 310, the axial length of the stator 310 is reduced. However, the vibration of the linear motor 300 can be reduced.

(3rd Embodiment) Next, 3rd Embodiment of the linear motor of this invention is described. FIG. 6 shows a linear motor 500 according to a third embodiment of the linear motor of the present invention. FIG. 6A is a cross-sectional view of the linear motor 500, and is particularly a cross-sectional view taken along the line II in FIG. 6B. FIG. 6B is a cross-sectional view taken along the line HH in FIG. The linear motor 500 includes a cylindrical yoke 520 that constitutes a housing of the linear motor 500. The cylindrical yoke 520 is formed with a plurality of tooth portions 511a, 511b, 511c, and 511d that protrude in the inner circumferential direction. These tooth portions 511a, 511b, 511c, and 511d are juxtaposed in the circumferential direction around the axis O of the yoke 520. The tooth portions 511a, 511b, 511c, and 511d include coils 521, 522, 523, 524 are wound respectively and are each configured as a magnetic pole. In the present embodiment, the tooth portions 511a and 511c are the first magnetic poles, and the tooth portions 511b and 511d are the second magnetic poles. The tooth portions 511a and 511c configured as the first magnetic poles are disposed on opposite sides with respect to the axis O of the yoke 520. Further, the tooth portions 511b and 511d configured as the second magnetic poles are disposed on opposite sides with respect to the axis O of the yoke 520. A cylindrical back yoke 531 is disposed on the radially inner peripheral side of the tooth portions 511a, 511b, 511c, and 511d. In the present embodiment, a stator 510 is configured by the yoke 520, the tooth portions 511a, 511b, 511c, and 511d, the coils 521, 522, 523, and 524, and the back yoke 531.

  Movers 541a, 541b, 541c, and 541d are provided in the spaces on the radially inner peripheral side around the axis O of the tooth portions 511a, 511b, 511c, and 511d and on the radially outer peripheral side of the back yoke 531. It arrange | positions so that it may each face 511b, 511c, and 511d. More specifically, the first movers 541a and 541c face the tooth portions 511a and 511c as the first magnetic poles, and the second movers 541b and 541d face the tooth portions 511b and 511d. The first movers 541a and 541c and the second movers 541b and 541d are composed of permanent magnets whose polarities are opposite in the radial direction around the axis of the yoke 520. These first movable elements 541a and 541c and second movable elements 541b and 541d constitute a movable body 540.

  Further, the first mover 541a is composed of two movers 541aa and 541ab, respectively. These two movers 541aa and 541ab are arranged side by side along the axis O direction of the yoke 520, and are divided and arranged on both sides in the axis O direction with the center in the axis O direction of the tooth portion 511a as the center. In addition, the polarities of the movable elements 541aa and 541ab are opposite to each other. In the example shown in FIG. 6B, the polarity on the yoke 520 side of the mover 541aa arranged on the one side in the axis O direction of the yoke 520 is N pole, and the movable element arranged on the other side in the axis O direction of the yoke 520. The polarity of the child 541ab on the yoke 520 side is the S pole. The other first mover 541c also has two movers like the mover 541a, and the polarity is the same as that of the mover 541a. On the other hand, the second mover 541b has two movers 541ba and 541bb, respectively, similarly to the mover 541a, but the polarity is set to be opposite to that of the mover 541a. Specifically, as shown in FIG. 6B, the polarity on the yoke 520 side of the mover 541ba arranged on one side in the axis O direction of the yoke 520 is the S pole, and the other side in the axis O direction of the yoke 520 is set. The polarity of the mover 541bb arranged on the yoke 520 side is N pole. The other second mover 541d also has two movers like the mover 541b, and the polarity is the same as that of the mover 541b.

  Next, the operation of the linear motor 500 as described above will be described. First, current in the first direction is passed through the coils 521, 522, 523, and 524. In the present embodiment, the current in the first direction is a coil wound around the tooth portions adjacent to each other, and is set such that currents in opposite directions are passed. Specifically, between the tooth portions 511a and 511b and between the tooth portions 511c and 511d, an electric current is passed from the front of the paper surface of FIG. 6A toward the back of the paper surface, and the tooth portions 511b and 511c And between the tooth portions 511d and 511a, a current is applied from the back of the paper to the front of the paper.

  As a result, a magnetic field in the direction shown in FIG. 6A is generated in the yoke 520 and the back yoke 531, and the movers 541a and 541c side of the tooth portions 511a and 511c as the first magnetic poles are magnetized to the N poles. The second movers 541b and 541d side of the tooth portions 511b and 511d configured as two magnetic poles are magnetized to the S pole. Accordingly, the first movers 541a and 541c move to one side in the axis O direction of the yoke 520 (the right side in FIG. 6B), and the second movers 541b and 541d move to the other side in the axis O direction of the yoke 520 ( Move to the left side of FIG. On the other hand, when a current in the second direction opposite to the first direction is applied to the coils 521, 522, 523, and 524, the first movers 541 a and 541 c cause the yoke 520 to move due to a phenomenon opposite to the above. The second mover 541b, 541d moves to one side in the axis O direction of the yoke 520 (right side in FIG. 6B). Therefore, by applying an alternating current to the coils 521, 522, 523, and 524, the respective movers reciprocate, and the first movers 541a and 541c and the second movers 541b and 541d are in the axis O direction. Will move to opposite sides of each other.

  Therefore, the vibration accompanying the movement of the mover is canceled by the symmetrical movement of the first mover 541a, 541c and the second mover 541b, 541d, and the vibration of the entire linear motor is reduced. . In addition, the number of components can be greatly reduced compared to a technique in which two linear motors are opposed to cancel out vibration, which is advantageous in terms of cost. Further, the first movable elements 541a and 541c and the second movable elements 541b and 541d are arranged side by side in the circumferential direction around the axis O, and the length of the stator 510 in the axis O direction can be reduced. Can contribute to downsizing. Further, the tooth portions 511a and 511c configured as the first magnetic poles and the tooth portions 511b and 511d configured as the second magnetic poles are arranged in parallel along the circumferential direction centering on the axis O. The length of the stator 510 in the axis O direction can be further reduced.

  The linear motor of the third embodiment can also be configured as a linear motor 700 according to a modification of the third embodiment as shown in FIG. FIG. 7A is a cross-sectional view of the linear motor 700, and FIG. 7B is a developed view of the linear motor 700 viewed by rotating 360 ° from the center O of FIG. 7A. The linear motor 700 constitutes a housing of the linear motor 700, and has a yoke 720 formed in a cylindrical shape, and a tooth portion 651a protruding toward the radially inner peripheral side centering on the axis O of the yoke 720. , 651b, 651c, 651d, coils 621, 622, 623, 624 wound around the tooth portions 651a, 651b, 651c, 651d, and movable bodies respectively disposed between the tooth portions 651a, 651b, 651c, 651d As movable elements 641, 642, 643, 644. In the present embodiment, a stator 710 is configured by the yoke 720, the tooth portions 651a, 651b, 651c, 651d, and the coils 621, 622, 623, 624.

  Next, the tooth portions 651a, 651b, 651c, and 651d are arranged in parallel in the circumferential direction around the axis O, respectively. Since the tooth portions 651a and 651c or the tooth portions 651b and 651d facing the axis O have the same configuration, the tooth portions 651a and 651b will be described as a representative. First, the tooth portions 651a and 651b are formed in a column direction 651aa and 651ba projecting inward from the outer peripheral portion 721 of the yoke 720, and in the circumferential counterclockwise direction around the axis O from the tip of the column portions 651aa and 651ba. First extending portions 651ab and 651bb extending in the direction from the tip of the column portions 651aa and 651ba, and second extending portions 651ac and 651bc extending in the clockwise direction around the axis O. ing. Similarly, in the other tooth portions 651c and 651d, a pillar portion, a first extension portion, and a second extension portion are formed, and coils 621 and 622 are formed on the pillar portions of the tooth portions 651a, 651b, 651c, and 651d. , 623 and 624 are wound respectively. Further, the first extending portion 651ab of the tooth portion 651a and the second extending portion 651bc of the tooth portion 651b are formed so as to face each other in the circumferential direction around the axis O, and other tooth portions Have the same relationship. In other words, between the tooth portions 651a, 651b, 651c, and 651d that are adjacent to each other in the circumferential direction about the axis O, the first extension portion and the second extension portion are centered on the axis O. It arrange | positions so that it may mutually face in the circumferential direction. In the present embodiment, the first extending portion and the second extending portion are magnetized by energization of the coil, and each is configured as a magnetic pole. In the present embodiment, the first extension portion 651ab of the first tooth portion 651a acts as the first magnetic pole, and is adjacent to the first tooth portion 651a in the circumferential direction around the axis O. The first extension portion 651bb of the tooth portion 651b can be regarded as acting as the second magnetic pole, and conversely, the second extension portion 651ac of the first tooth portion 651a acts as the second magnetic pole, It can be considered that the second extending portion 651bc of the second tooth portion 651b acts as the first magnetic pole. The same relationship as that of the tooth portions 651a and 651b can be said in the tooth portions 651c and 651d.

  On the other hand, the movers 641, 642, 643, 644 are disposed in a space sandwiched between the first extension portion and the second extension portion of the tooth portions 651a, 651b, 651c, 651d. Specifically, first movers 641 and 643 are disposed between the tooth portions 651a and 651b and between the tooth portions 651c and 651d, respectively, and between the tooth portions 651b and 651c, and Second movers 642 and 644 are arranged between the tooth portions 651d and 651a, respectively. In other words, the first mover 641 is disposed so as to face the first extending portion 651ab as the first magnetic pole, and the second mover is faced to the first extending portion 651bb as the second magnetic pole. 642 is arranged, and also in the other first movable element 643 or the other second movable element 644, the first extension part or the tooth part 651d of the tooth part 651c acting as the first magnetic pole or the second magnetic pole respectively. It arrange | positions so that a 2nd extension part may be faced.

  The movers 641, 642, 643, 644 are composed of permanent magnets having different polarities in the circumferential direction around the axis O, in other words, the circumferential clockwise direction around the axis O; It is composed of a permanent magnet whose polarity is opposite on the circumferential counterclockwise side centering on the axis O. Further, each of the movers 641, 642, 643, 644 has two movers arranged in parallel in the axis O direction as shown in FIG. 7B. The mover 641 will be described as a representative. The mover 641a disposed on one side in the axis O direction (upper side in FIG. 7), and the mover 641b disposed on the other side in the axis O direction (lower side in FIG. 7). Have Similarly, the other movable elements 642, 643, and 644 have movable elements 642a, 643a, and 644a and movable elements 642b, 643b, and 644b. Further, the movable elements 641a, 642a, 643a, 644a and the movable elements 641b, 642b, 643b, 644b arranged in parallel in the axial direction have opposite polarities. On the other hand, in the mover arranged in parallel along the circumferential direction with the axis O as the center, the direction of the polarity is the same. Specifically, as shown in FIG. 7B, the polarity of the mover is set.

  Hereinafter, the operation of the linear motor 700 shown in FIG. 7 will be described. First, currents in the first direction are passed through the coils 621, 622, 623, and 624. In the present embodiment, the current in the first direction is a state in which a current in the direction as shown in FIG. 7 is energized, in other words, between the tooth portions 651a and 651b and between the tooth portions 651c and 651d. 7, an electric current flows from the front side of the paper in FIG. 7 toward the back of the paper surface, and between the tooth portions 651 b and 651 c and between the tooth portions 651 d and 651 a, the back side of the paper surface in FIG. 7. In this state, a current flows toward. When the current in the first direction is thus applied, the first extension portion and the second extension portion of the tooth portions 651a, 651b, 651c, 651d are magnetized as shown in FIG. 7B. . Specifically, the first and second extending portions of the tooth portions 651a and 651c are N poles, and the first and second extending portions of the tooth portions 651b and 651d are S poles. Accordingly, the first movers 641 and 643 move to one side in the axial direction (the upper side in FIG. 7B), and the second movers 643 and 644 move to the other side in the axial direction (see FIG. 7B). Move downward). On the other hand, when the coil 621, 622, 623, 624 is energized with a current in the second direction opposite to the first direction, the first extending portion and the second extending portion of the tooth portions 651a, 651b, 651c, 651d are formed. 7B is magnetized to the opposite polarity to that of FIG. Accordingly, the first movers 641 and 643 move to the other side in the axial direction (the lower side of FIG. 7B), and the second movers 643 and 644 move to the one side in the axial direction (FIG. 7B). Move upward).

  According to the linear motor 700 as described above, the coils 621, 622, 623, and 624 are alternately energized with the current in the first direction and the current in the second direction, so that the first movers 641 and 643 and the second moveable are provided. The children 643 and 644 can be reciprocated in directions opposite to each other along the axis O direction. Therefore, the vibration accompanying the movement of the mover is canceled by the movement of the first mover 641 and 643 and the second mover 643 and 644, respectively, and the vibration of the entire linear motor 700 can be suppressed. . In addition, since the linear motor is configured as one linear motor 700, the number of components can be reduced and it is advantageous in terms of cost as compared with a technique in which two linear motors are arranged to face each other. . In addition, the first magnetic pole and the second magnetic pole are juxtaposed along the circumferential direction centered on the axis O of the stator 710, and the first movable element 641, 643, the second movable element 643, 644, and the magnetic pole face each other. As described above, since it is arranged in parallel in the circumferential direction with the axis O as the center, the vibration of the linear motor can be reduced while reducing the length of the stator 710 in the axis O direction.

(Linear compressor)
Hereinafter, a linear compressor of the present invention will be described with reference to the drawings.

First Embodiment FIG. 8 illustrates a linear compressor 600 according to a first embodiment of the linear compressor of the present invention. The linear compressor 600 is a linear compressor using the linear motor 100A shown in FIG. Parts having the same configurations and functions as those in FIG. 1 are given the same reference numerals, and descriptions thereof are omitted. A linear compressor 600 shown in FIG. 8 includes a cylinder 153, a first piston 151 and a second piston 152 that are reciprocally movable in the axial direction of the cylinder 153, and a linear motor 100A that drives the pistons 151 and 152. And have. A working space 157 extending in the direction of the axis O is formed in the cylinder 153, and pistons 151 and 152 are arranged in the working space 157. These two pistons 151 and 152 are opposite to each other on one end side, and the other end sides are connected to both end sides of the cylinder 153 via springs 154 and 155, respectively. By reciprocating these pistons 151 and 152 so as to face each other in the working space 157, the fluid in the working space 157 is compressed and expanded. A hole 156 for discharging and sucking fluid from the working space 157 is formed in the wall surface of the cylinder 152. The pistons 151 and 152 are respectively provided with the movers 131 and 132 of the linear motor 100B so as to be fitted into the cylindrical frames 151a and 152a. Further, a stator 110 of the linear motor 100 </ b> A is arranged on the radially outer side centering on the axis O of the cylinder 153 so as to cover the cylinder 153.

  In such a configuration of the linear compressor 600, when an alternating current is passed through the coils 121 and 122 of the linear motor 100A, the pistons 151 and 152 together with the movable body 130 of the linear motor 100A reciprocate in directions opposite to each other in the axis O direction. To do. Thereby, the fluid in the working space 157 formed by the cylinder 153 can be compressed and expanded, and vibration generated in the linear compressor 600 can be reduced. Furthermore, this linear compressor 600 has only one linear motor 100A, and the number of parts can be reduced as a whole, which contributes to cost reduction of the linear compressor 600.

  The linear compressor 600 shown in FIG. 8 can be used for an animal-cooled refrigerator as shown in FIGS. FIG. 9 shows a Stirling refrigerator 600 </ b> A using the linear compressor 600. A Stirling refrigerator 600A shown in FIG. 9 includes a linear compressor 600, a low-temperature side heat exchanger 161a, a cooler 161b, a high-temperature side heat exchanger 161c, a displacer 163a, and the like as a pressure vibration source that generates pressure vibration of the working gas. And a low temperature generator 160 that generates a low temperature by expansion and contraction of the working gas. The displacer 163a functions as a phase adjusting mechanism that adjusts the phase between the pressure vibration of the working gas generated by the linear compressor 600 as a pressure vibration source and the displacement vibration of the working gas.

  The low-temperature generating part 160 includes a cylindrical inner inner member arranged in the same shape as the axis O of the first housing 161 in the first housing 161 formed in a concave shape having a hollow part. And a cylinder 162. A low temperature side heat exchanger 161a, a livestock cooler 161b, a high temperature side heat exchanger 161c, a displacer 163a, and the like are disposed in a cylindrical space formed by the first housing 161 and the inner cylinder 162. Specifically, the first housing 161 has a wall portion formed on one end side in the axis O direction (hereinafter also referred to as a low temperature end side) and an opening portion formed on the other end side (hereinafter also referred to as a high temperature end side). Low temperature side heat exchange from one end side to the other end side of the first housing 161 in a cylindrical space formed by the inner peripheral surface of the first housing 161 and the outer peripheral surface of the inner cylinder 162. The cooler 161a, the cooler 161b, and the high temperature side heat exchanger 161c are arranged in this order, and the displacer 163a is arranged on the inner peripheral side of the inner cylinder 162 so as to be reciprocally movable with respect to the inner cylinder 162. As described above, the Stirling refrigerator 600A shown in FIG. 9 is a coaxial Stirling refrigerator.

  A gap 160a is formed between the low temperature side heat exchanger 161a disposed on one end side of the first housing 161 and the wall portion of the first housing 161, and the inner cylinder 162 and the first housing 161 are A gap is also formed between the wall portion. For this reason, the low temperature side heat exchanger 161a communicates with the expansion space 171 formed by the tip of the displacer 163a, the side surface of the inner cylinder 162, and the wall surface of the first housing 161.

  A second housing 165 is disposed on the other end side of the first housing 161. The second housing 165 has a hollow portion 173 inside, and has a structure in which the hollow portion 173 is closed by a flange portion 164 formed on the first housing 161 side. Further, the opening on the other end side of the first housing 161 is also closed by the flange portion 164. Further, a communication passage 174 that connects the outside of the second housing 165 and the inside of the first housing 161 is formed in the flange portion 164, and the communication passage 174 is connected to the linear compressor 600. Specifically, the working space 157 of the linear compressor 600 and the communication path 174 of the second housing 165 communicate with each other through a hole 156 formed in the cylinder 153 of the linear compressor 600 shown in FIG.

  Further, in the present embodiment, a buffer space 172 is formed by the rear end of the displacer 163 a, the side surface of the inner cylinder 162, and the flange portion 164, and this buffer space 172 is also connected to the linear compressor 600 via the communication path 174. Are connected to the working space 157 of FIG. Specifically, a gap 160b is formed between the inner cylinder 162 and the flange portion 164, and the buffer space 172 on the inner peripheral side of the inner cylinder 162 and the first housing 161 are interposed via the gap 160b. A communication path 174 communicating with the inside is connected.

  On the other hand, to the displacer 163a disposed in the inner cylinder 162, one end of a rod-shaped display server 163b is connected to the other axial end side (second housing 165 side). The other end of the display server 163 b is inserted into an insertion hole 164 a formed in the flange portion 164 and communicates with the hollow portion 173 of the second housing 165, and the wall of the second housing 165 forming the hollow portion 173 The part 165a and the spring 163c are connected.

  Hereinafter, the operation of the above Stirling refrigerator 600A will be described. When the linear compressor 600 is operated, the reciprocating movement of the pistons 151 and 152 applies pressure vibration to the working gas in the low temperature generating unit 160, and the displacer 163a reciprocates. At this time, the phase of the pressure vibration and the displacement vibration of the working gas in the animal cooler 161b is appropriately adjusted by the action of the displacer 163a as the phase adjusting mechanism. Specifically, it is adjusted so that the phase of the pressure vibration and displacement vibration of the working gas is shifted by approximately 90 °. Thereby, in the livestock cooler 161b, the bucket relay of heat is performed toward the high temperature type heat exchanger 161c from the low temperature side heat exchanger 161a, and low temperature is produced | generated in the low temperature side heat exchanger 161a.

  FIG. 10 shows an example of a pulse tube refrigerator 600B using the linear compressor 600 of FIG. In the pulse tube refrigerator 600B, a displacer 183 having a shorter axial length is used instead of the displacer 163a of the Stirling refrigerator 600A of FIG. 9, and a distributor 181 is provided at the opening on the low temperature end side of the inner cylinder 162. It is different in point. That is, the portion on the low temperature end side of the inner cylinder 162 acts as a pulse tube, and the displacer 183 is movable only on the high temperature end side of the low temperature generating portion 160. According to this, since there is no drive part in a low-temperature part, the reliability of a refrigerator improves.

  Note that the linear compressor 600 shown in FIG. 8 is not limited to the forms shown in FIGS. 9 and 11, and can be used for other animal-cooled refrigerators. For example, a phase adjustment mechanism having an inertance tube and a buffer tank in place of the displacer can be employed.

  In addition to the linear motor 100A shown in FIG. 1, the linear motor shown in FIGS. 2 to 8 can be applied to a linear compressor, and an animal-cooled refrigerator can be configured using such a linear compressor. it can.

Second Embodiment FIG. 11 shows a second embodiment of a linear compressor using the linear motor of the present invention. The linear compressor shown in FIG. 11 is used as a fluid pump 800 that pumps fluid to the outside using the linear motor 200 shown in FIG. Parts having the same configuration and function as those in FIG. 3 are given the same reference numerals, and descriptions thereof are omitted. A fluid pump 800 shown in FIG. 11 drives a cylinder 253, a first piston 251, a second piston 252, and pistons 251 and 252 that are disposed in the cylinder 253 so as to reciprocate in the axial direction of the cylinder 253. And a linear motor 200. The first piston 251 and the second piston 252 are arranged in the cylinder 253 so that the front ends thereof are opposed to each other, and the rear end sides of the first piston 251 and the second piston 252 are connected to both end sides of the cylinder 253 via springs 254 and 255, respectively. Has been.

  On the other hand, a fluid outflow hole 261 is formed in the wall surface at the axially central portion in the cylinder 253, and partition walls 281 a and 281 b are provided between the fluid outflow hole 261 and the tip portions of the pistons 251 and 252. Each is arranged. In addition, fluid inlet holes 262a and 262b for allowing fluid to flow into the cylinder 253 are formed in the wall portions 253a and 253b on both ends of the cylinder 253 (rear ends of the pistons 251 and 252), respectively. . Here, piston rear end side spaces 271a and 271b are respectively formed by the wall portions 253a and 253b constituting the both ends of the cylinder 253 and the rear end portions of the pistons 251 and 252 respectively, and the partition wall portions 281a and 281b and the piston 251 are respectively formed. Piston tip side spaces 272a and 272b are formed by the tip portion of 252, respectively. The partition walls 281a and 281b are formed with openings 283a and 283b, respectively, that allow the central space 263 in which the fluid outflow hole 261 is located and the piston front end spaces 272a and 272b to communicate with each other. Outlet valve plates 282a and 282b are arranged on the partition wall portions 281a and 281b on the central space 263 side so as to cover the openings 283a and 283b, respectively, and piston tip side spaces 272a and 272b and the central space 263 It is possible to control the communication and disconnection. The outflow valve plates 282a and 282b are held by the partition walls 281a and 281b so as to be displaceable by a predetermined amount from the partition walls 281a and 281b toward the central space 263. When the pistons 251 and 252 move to the central space 236 side and the fluid in the piston tip side spaces 272a and 272b is compressed, the outflow valve plates 282a and 282b move to the central space 236 side by the pressure, and are opened. When the pistons 251 and 252 move to both ends of the cylinder 253, the openings 283a and 283b are closed by the negative pressure of the piston tip side spaces 272a and 272b. .

  On the other hand, the movers 131 and 132 of the linear motor 200 shown in FIG. 3 are arranged on the pistons 251 and 252 so as to be fitted into the recessed frames 251a and 251b, respectively. As shown in FIGS. 3 and 11, the movers 131 and 132 have cylindrical shapes having hollow portions 135a and 135b, respectively. Further, openings 252a and 252b communicating with the hollow portions 135a and 135b of the movable elements 131 and 132 are formed at the tip portions of the pistons 251 and 252 (wall portions of the frame bodies 251a and 251b), respectively. Therefore, the piston rear end side spaces 271a, 271b and the piston front end side spaces 272a, 272b can communicate with each other by the openings 252a, 252b and the hollow portions 135a, 135b of the movers 131, 132. On the other hand, inflow valve plates 264a and 264b are arranged on the front end sides of the pistons 251 and 252 so as to cover the openings 252a and 252b, respectively, and piston rear end side spaces 271a and 271b and piston front end side spaces 272a, Communication and blocking with the 272b can be controlled. The inflow valve plates 264a and 264b are held at the tip portions of the pistons 251 and 252 so as to be displaced by a predetermined amount from the tip portions of the pistons 251 and 252 toward the piston tip-side spaces 272a and 272b. When the pistons 251 and 252 move toward the central space 236, the inflow valve plates 264a and 264b are brought into close contact with the tip portions of the pistons 251 and 252 by the pressing force of the pistons 251 and 252, and the openings 252a and 252b. When the pistons 251 and 252 move to both ends of the cylinder 253, the pistons 251 and 252 move toward the piston tip side spaces 272a and 272b due to the negative pressure of the piston tip side spaces 272a and 272b. 252a and 252b are opened.

  In such a configuration of the fluid pump 800, when an alternating current is passed through the coils 221, 222, 223, and 224 of the linear motor 200, the pistons 251 and 252 together with the movable body 130 of the linear motor 200 are opposite to each other in the axis O direction. Move back and forth. At this time, when the pistons 251 and 252 move to both ends of the cylinder 253, the fluid that has flowed into the piston rear end side spaces 271a and 271b from the fluid inflow holes 253a and 253b is opened. It flows into the piston tip side space 272a, 272b from 252b. On the other hand, the openings 283a and 283b of the partition walls 281a and 281b are closed, and there is no fluid outflow from the piston tip side spaces 272a and 272b to the central space 263. On the other hand, when the pistons 251 and 252 move to the central space 263 side, the fluid flowing into the piston tip side spaces 272a and 272b is centered from the openings 283a and 283b of the partition walls 281a and 281b that are opened. It flows out into the space 263. On the other hand, the openings 252a and 252b formed at the tip portions of the pistons 251 and 252 are closed, and the backflow of fluid from the openings 252a and 252b to the piston rear end side spaces 271a and 271b is suppressed. . Therefore, the fluid is pumped to the outside through the fluid outflow hole 261, and a function as a fluid pump or a compressor is realized.

  As described above, according to the fluid pump 800 of this embodiment, the vibration accompanying the movement of the pistons 251 and 252 is offset by the movement of the pistons 252 and 251, so that the linear motor is used. Therefore, the vibration of the entire apparatus can be reduced. In addition, since the two linear motors are not arranged to face each other but are constituted by one linear motor, the number of parts of the entire apparatus can be reduced, which is advantageous in terms of cost.

The figure explaining 1st Embodiment of the linear motor of this invention The figure explaining 1st Embodiment modification 1 of the linear motor of this invention The figure explaining 1st Embodiment modification 2 of the linear motor of this invention The figure explaining 1st Embodiment modification 3 of the linear motor of this invention The figure explaining 2nd Embodiment of the linear motor of this invention The figure explaining 3rd Embodiment of the linear motor of this invention The figure explaining 3rd Embodiment modification of the linear motor of this invention The figure explaining 1st Embodiment of the linear compressor of this invention The figure which shows an example of the Stirling refrigerator using the linear compressor of this invention. The figure which shows an example of the pulse tube refrigerator which uses the linear compressor of this invention. A second embodiment of the linear compressor of the present invention will be described.

Explanation of symbols

110, 210, 310, 410, 510, 710 .. Stator 130, 340, 540 .. Movable body 131 .. First mover 441, 341a, 341c, 541a, 541c, 641, 643 .. First mover (permanent magnet)
132 .. Second mover 442, 341b, 341d, 541b, 541d, 642, 643 .. Second mover (permanent magnet)
121, 122, 221, 222, 223, 224, 421, 321, 521, 522, 523, 524, 621, 622, 623, 624 .. coil 141 a, 142 a, 241 a, 242 a... First magnetic pole (permanent magnet)
141c, 142c, 241d, 242d, second magnetic pole (permanent magnet)
141b, 142b, .. center magnetic pole, third magnetic pole, fourth magnetic pole (permanent magnet)
241b, 242b .. Third magnetic pole (permanent magnet)
241c, 242c .. 4th magnetic pole (permanent magnet)
311a, 311c, 411a, 511a, 511c, 651a, 651c, first magnetic pole 311b, 311d, 411b, 511b, 511d, 651b, 651d, second magnetic pole 153, 253,. 152, 252 ··· Second piston 100A, 100B, 200, 300, 400, 500, 700 · · Linear motor 600, 800 · · Linear compressor

Claims (18)

A stator,
A movable body provided to be reciprocable in a predetermined direction with respect to the stator;
A coil that is disposed on either the stator or the movable body, and generates a magnetic field in at least one of the stator and the movable body by energization;
The movable body is arranged on either the stator or the movable body, and acts on the magnetic field generated in the stator or the movable body by the coil, so that the movable body is placed between the stator and the movable body. In a linear motor having a permanent magnet that generates a magnetic force biased in the direction,
The linear motor according to claim 1, wherein the movable body includes at least two movers that are urged by the magnetic force so as to move in opposite directions in the predetermined direction when the coil is energized. The stator includes a permanent magnet disposed so as to face the movable body, the movable body includes at least a part of an iron-based member, and the coil is energized to the iron-based member of the movable body. The linear motor according to claim 1, wherein the linear motor forms a magnetic field in a predetermined direction. The stator includes a yoke disposed so as to face the movable body, the coil forms a magnetic field in a predetermined direction on the yoke by energization, and the movable body forms a magnetic field formed on the yoke. The linear motor according to claim 1, further comprising a permanent magnet that acts on the linear motor. The said movable body has an iron-type member in at least one part, The said coil forms the magnetic field of a predetermined direction in the said iron-type member of the said movable body by electricity supply, The Claim 3 characterized by the above-mentioned. Linear motor. The stator is disposed on the one side in the predetermined direction of the stator so as to face the movable body, and on the other side in the predetermined direction of the stator so as to face the movable body. A second magnetic pole,
The movable body is attracted to the first magnetic pole when a current in a first direction is applied to the coil, and the first is applied when a current in a second direction opposite to the first direction is applied to the coil. A first mover that is energized in a direction away from the magnetic pole, and when the current in the first direction is applied to the coil, the second magnetic pole is attracted and the current in the second direction is applied to the coil The linear motor according to claim 1, further comprising: a second mover that is biased in a direction away from the second magnetic pole. The stator forms a hollow space along the predetermined direction, and the first and second magnetic poles are arranged side by side in the predetermined direction on the wall surface of the stator forming the hollow space. The movable body is arranged along the predetermined direction in the hollow space so that the first movable element faces the first magnetic pole and the second movable element faces the second magnetic pole. The linear motor according to claim 5, wherein the linear motor is provided. The stator includes a third magnetic pole that attracts the first mover when a current in the second direction is applied to the coil, and a first magnetic pole that attracts the first mover when the current in the second direction is applied to the coil. The linear motor according to claim 5, further comprising a fourth magnetic pole for attracting the two movers. The linear motor according to claim 7, wherein the third magnetic pole and the fourth magnetic pole are the same magnetic pole. The stator has a central magnetic pole arranged to face the movable body at a central portion of the stator,
The movable body is urged to one side in a predetermined direction of the stator by a repulsive force from the central magnetic pole when a current in the first direction is applied to the coil, and the coil is opposite to the first direction. A first mover attracted to the central magnetic pole when a current in the second direction is applied, and a predetermined force of the stator by a repulsive force from the central magnetic pole when a current in the first direction is applied to the coil 2. The linear motor according to claim 1, further comprising: a second mover that is biased toward the other side of the direction and is attracted to the central magnetic pole when the coil is supplied with a current in the second direction. . The stator forms a hollow space along the predetermined direction, the central magnetic pole is disposed on a wall surface of the stator forming the hollow space, and the movable body is the first body. The linear motor according to claim 9, wherein an outer peripheral surface of the mover and an outer peripheral surface of the second mover are arranged in parallel in the hollow space so as to face the central magnetic pole. The stator has a pair of tooth portions arranged so as to face each other with the movable body interposed therebetween, and a permanent magnet acting as the magnetic pole is arranged on a surface facing the movable body. The coil is wound around each tooth portion,
11. The linear motor according to claim 5, wherein the movable body includes the first movable element and the second movable element arranged between the pair of tooth portions. . The stator is disposed so as to be opposed to each other with the movable body interposed therebetween, and a first pair of tooth portions in which a permanent magnet that acts on the magnetic pole is disposed on a surface facing the movable body, and the movable A second pair of tooth portions, which are arranged so as to face each other across the body and the permanent magnet acting on the magnetic pole is arranged on a surface facing the movable body, are arranged in parallel in the predetermined direction, The coil is wound around each of these tooth portions,
The movable body is configured such that the first movable element is disposed between the first pair of tooth portions, and the second movable element is disposed between the second pair of tooth portions. The linear motor according to any one of claims 5 to 10. The stator has a cylindrical shape with the predetermined direction as an axis,
The first magnetic pole and the second magnetic pole are arranged over a circumferential direction centered on the axis of the stator,
The movable body is arranged in a circumferential direction around the axis of the stator so that both the first movable element and the second movable element face both the first magnetic pole and the second magnetic pole. Alongside,
The first mover is biased toward the first magnetic pole when a current in the first direction is applied to the coil, and the second mover receives a current in the second direction in the coil. The linear motor according to claim 5, wherein the linear motor is biased toward the second magnetic pole side when energized. The coil is wound around the axis of the stator, and the first magnetic pole and the second magnetic pole are respectively magnetized to opposite polarities by energizing the coil, and the first movable The child and the second mover are permanent magnets having opposite polarities in the radial direction around the axis of the stator, and the polarity on the side of the first mover facing the stator and the second The linear motor according to claim 13, wherein the polarity of the movable element on the side facing the stator is different. The stator has a cylindrical shape with the predetermined direction as an axis, and includes a first magnetic pole and a second magnetic pole arranged in parallel along a circumferential direction around the stator axis,
The movable body includes a first movable element disposed so as to face the first magnetic pole in a radial direction centered on the stator axis, and the second movable body in a radial direction centered on the stator axis. A second mover arranged so as to face the magnetic pole, and the first mover and the second mover are arranged side by side in a circumferential direction around the axis of the stator. It is what
When the current in the first direction is supplied to the coil, the first mover receives a repulsive force from the first magnetic pole and moves to one side in a predetermined direction of the stator, and the coil moves in the first direction. When the current in the second direction opposite to that is energized, it receives an attractive force from the first magnetic pole and moves to the center side of the stator,
When the current in the first direction is supplied to the coil, the second mover receives a repulsive force from the second magnetic pole and moves to the other side in the predetermined direction of the stator, and the coil moves in the second direction. 2. The linear motor according to claim 1, wherein the linear motor receives the attractive force from the second magnetic pole and moves toward the center side of the stator when the current is applied. The stator has a first tooth portion and a second tooth portion that protrude in opposition to the movable body and are juxtaposed in a circumferential direction around the axis of the stator, and the first tooth portion and the second tooth portion. The coils are wound around 2 tooth portions, respectively, and the first magnetic pole and the second magnetic pole are respectively configured.
The first magnetic pole and the second magnetic pole are respectively magnetized in opposite polarities when a current in the first direction or the second direction is passed through the coil,
The movable body is composed of a permanent magnet whose polarity is reversed in the radial direction around the axis of the stator, and the polarity of the first movable element facing the first magnetic pole and the second movable element The linear motor according to claim 15, wherein the polarity on the side facing the second magnetic pole is different. A cylinder,
Two pistons arranged in the cylinder so as to be capable of reciprocating in the axial direction of the cylinder;
A linear motor connected to the piston and reciprocatingly moving the piston,
The linear motor according to any one of claims 1 to 16, wherein the linear motor is arranged so that the predetermined direction of the linear motor and the axial direction of the cylinder coincide with each other.
The piston has a first piston connected to the first mover of the linear motor and a second piston connected to the second mover of the linear motor. A pressure vibration source that generates a pressure vibration of the working gas, a low-temperature generating section that generates a low temperature by expansion and contraction of the working gas, a pressure vibration of the working gas generated by the pressure vibration source, and a displacement vibration of the working gas, A phase adjustment mechanism for adjusting the phase of
The regenerative refrigerator is characterized in that the pressure vibration source includes the linear compressor according to claim 17.

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