JP7033221B2 - Linear motor and compressor - Google Patents

Description

The present invention relates to a linear motor.

A linear motor having a thrust generation mechanism has a shape in which a rotating machine is cut open in a straight line, and thrust is generated in the mover by a magnetic force acting between the magnetic poles formed in each of the stator and the mover.

As a background technique in this technical field, linear motors described in Japanese Patent Application Laid-Open No. 2008-289324 (Patent Document 1) and International Publication No. 2011/155022A1 (Patent Document 2) are known.

In the linear motor of Patent Document 1, a permanent magnet is fitted into a plurality of magnet holding holes of a magnet holding frame to form a rail having a unit length, and a rail having this unit length is added to form a long rail. And the mover is driven along this long rail. Frame edge holding plates are provided on both edges of the magnet holding frame so as to sandwich the magnet holding frame from both the upper and lower sides, and the upper surface side frame edge holding plate and the lower surface side frame edge holding plate are placed on the upper surface. It is fastened with a bolt that inserts the magnet holding frame from the side to the lower surface side. As a result, in the linear motor of Patent Document 1, the permanent magnet is securely fixed to the magnet holding frame without rising from the magnet holding hole (see paragraphs 0024, 0036-0043, FIG. 4).

In the linear motor of Patent Document 2, a plurality of permanent magnets are installed on the upper and lower surfaces of a flat plate-shaped high magnetic permeability member so as to be integrated to form a mover, and the mover is provided at both end edges of the mover. A movable element holding member for mechanically fixing is provided. The mover holding member includes a first notch in which the end edge of the permanent magnet on the upper surface side is fitted, a second notch in which the end edge of the high magnetic permeability member is fitted, and a lower surface side. It has a third notch into which the end edge of the permanent magnet is fitted. The movable element holding member has an insertion hole through which a bolt is inserted on the side surface (the surface opposite to the side on which each permanent magnet and the high magnetic permeability member are fitted), and the bolt through which the insertion hole is inserted is high. It is fixed to the high magnetic permeability member by being fastened to the screw holes screwed on both end edges of the magnetic permeability member. As a result, in the linear motor of Patent Document 2, the permanent magnets on the upper and lower surfaces of the high magnetic permeability member are mechanically held by the first notch and the third notch of the mover holding member, and the permanent magnet is movable. It is prevented from coming off the child (see paragraphs 0055-61, FIGS. 14-15C).

Japanese Unexamined Patent Publication No. 2013-102695 International Publication No. 2011/155022A1

In the linear motor of Patent Document 1, the frame edge holding plate on the upper surface side and the frame edge holding plate on the lower surface side are fastened with bolts for inserting the magnet holding frame from the upper surface side to the lower surface side, and both frames are fastened. The edge holding plate is fixed to the magnet holding frame. On the other hand, in the linear motor of Patent Document 2, bolts are fastened from the side surface of the mover holding member.

In Patent Document 1 and Patent Document 2, there is no disclosure about the configuration of the guide rail of the mover, and sufficient consideration is not given to the configuration of the guide rail.

An object of the present invention is to propose a configuration of a bearing suitable for a linear motor and a guide rail thereof.

In order to achieve the above object, the linear motor of the present invention
An armature with a monopole and a winding,
A linear motor comprising a permanent magnet magnetic pole and a field magnet having a magnet holding portion for holding the permanent magnet magnetic pole, wherein either the armature or the field magnet is a stator and the other is a mover. hand,
The direction along the moving direction of the mover is the first direction, the direction along the width direction of the field magnet perpendicular to the first direction is the second direction, and the field perpendicular to the first direction and the second direction. When the direction along the thickness direction of the magnet is the third direction,
The magnet holding portion is provided at each of a magnetic pole frame having an fitting portion into which the permanent magnet magnetic pole is fitted in the third direction and both end portions of the magnetic pole frame at both ends in the second direction. In a linear motor having a frame-side end mounting member that abuts on the end face of the permanent magnet pole from three directions, the frame-side end mounting member is the one end face side of the permanent magnet pole in the third direction. Along the second direction at the first projecting portion protruding from the side end portion of the field magnet toward the center portion along the second direction and the other end face side of the permanent magnet magnetic pole in the third direction. The second projecting portion protruding from the side end portion of the field magnet toward the central portion, and the first projecting portion and the second projecting portion provided along the third direction are connected to each other. The connecting portion is integrally configured to form a guide rail that guides the movement of the mover in the first direction , and the rail surface of the guide rail is the first protruding portion and the second protruding portion. Consists of
The frame side end mounting member and the magnetic pole frame are fixed by tightening, and knock pins or screws provided so as to straddle the frame side end mounting member and the magnetic pole frame along the third direction. A drop-out prevention structure for preventing the frame-side end mounting member from falling off from the magnetic pole frame is configured .

Further, in order to achieve the above object, the compressor of the present invention is used.
It includes a cylinder and a piston that reciprocates inside the cylinder, and also includes the linear motor as a drive motor for driving the piston .

According to the present invention, the distance between the upper and lower guide rail surfaces can be maintained with high accuracy and constant, and a bearing suitable for a linear motor and a configuration of the guide rail thereof can be provided. Issues, configurations and effects other than those described above will be clarified by the following description of the embodiments.

The perspective view of the linear motor which concerns on Example 1. FIG. The perspective view of the mover (field magnet) of the linear motor which concerns on Example 1. FIG. FIG. 3 is a cross-sectional view perpendicular to the front-rear direction of the linear motor according to the first embodiment. The schematic diagram which shows the cross section perpendicular to the front-rear direction about the movable element peripheral part of the linear motor which concerns on Example 1. FIG. The schematic diagram which shows the cross section perpendicular to the front-rear direction about the movable element peripheral part of the linear motor which concerns on the modification example (modification example 1) of Example 1. FIG. The schematic diagram which shows the cross section perpendicular to the front-rear direction about the movable element peripheral part of the linear motor which concerns on the modification example (modification example 2) of Example 1. FIG. The schematic diagram which shows the cross section perpendicular to the front-rear direction about the movable element peripheral part of the linear motor which concerns on the modification example (modification example 3) of Example 1. FIG. FIG. 6 is a schematic cross-sectional view of the peripheral portion of the movable element of the linear motor according to the second embodiment, which is perpendicular to the front-rear direction. FIG. 6 is a schematic cross-sectional view of the peripheral portion of the movable element of the linear motor according to the modified example of the second embodiment (modified example 4), which is perpendicular to the front-rear direction. FIG. 6 is a schematic cross-sectional view of the peripheral portion of the movable element of the linear motor according to the third embodiment, which is perpendicular to the front-rear direction. FIG. 6 is a schematic cross-sectional view of the peripheral portion of the movable element of the linear motor according to the reference example of the third embodiment, which is perpendicular to the front-rear direction. FIG. 6 is a schematic cross-sectional view of the peripheral portion of the movable element of the linear motor according to the fourth embodiment, which is perpendicular to the front-rear direction. The perspective view which shows the Example (Example 5) of the compressor using the linear motor which concerns on this invention. FIG. 3 is a cross-sectional view of a main part showing an embodiment (Example 5) of a compressor using a linear motor according to the present invention. The block diagram of the refrigerator which concerns on Example 6. The block diagram of the air suspension for a vehicle which concerns on Example 7. FIG.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. In a plurality of examples and modifications of each embodiment, similar components are designated by the same reference numerals, and the same description will not be repeated. For the sake of explanation, the terms front-back, left-right, and up-down directions that are orthogonal to each other are used, but the direction of gravity does not necessarily have to be downward, and can be parallel to the up, right, left, front or back directions, or other directions. ..

In each of the embodiments and modifications described below, the front-rear direction coincides with the drive direction of the mover 2, and the vertical direction is perpendicular to the magnetic pole surface (the surface where the S and N poles are generated) of the permanent magnet magnetic pole 210. Match the direction. Further, the movable element 2 has a longitudinal direction in the front-rear direction, and the left-right direction may be referred to as a width direction of the mover 2 for description. Alternatively, the direction along the moving direction (front-back direction) of the mover 2 is the first direction, and the direction along the width direction (left-right direction) of the field magnet perpendicular to the first direction is the second direction, the first direction, and the second direction. The direction along the thickness direction (vertical direction) of the field magnet perpendicular to the direction may be described as the third direction.

[Example 1]
The linear motor according to the first embodiment of the present invention will be described with reference to FIGS. 1 to 4A. FIG. 1 is a perspective view of the linear motor according to the first embodiment. FIG. 2 is a perspective view of a mover (field magnet) of the linear motor according to the first embodiment. FIG. 3 is a cross-sectional view perpendicular to the front-rear direction of the linear motor according to the first embodiment.

The linear motor 100 includes a stator 1 and a mover 2. In the following description, the stator side is described as a stator that is stationary with respect to the ground, and the field magnet side is described as a mover that moves the field magnet side in the front-back direction with respect to the ground. There may be.

≪Stator 1≫
The stator 1 includes an armature 3, end members 4 arranged on the front side and the rear side of the armature 3, and windings 6. The armature 3 has a soft magnetic material core 300 and a spacer 310, and the plurality of cores 300 are connected by a soft magnetic material spacer 310. That is, the plurality of cores 300 are connected in the front-rear direction with the spacer 310 sandwiched between them. This makes it possible to form a magnetic path including a plurality of cores 300 and spacers 310. The core 300 has magnetic pole teeth 301 on the upper and lower sides, each of which is wound with a winding 6.

One or two or more armatures 3 can be arranged in the front-rear direction. Further, the end member 4 can be provided on the front side of the frontmost armature 3 and / or on the rear side of the rearmost armature 3.

≪Core 300≫
The core 300 has magnetic pole teeth 301 arranged so as to face each other with the mover 2 interposed therebetween, and an arm portion 302 connecting these two magnetic pole teeth 301. The magnetic pole teeth 301 and the arm portion 302 can be configured, for example, by laminating electromagnetic steel sheets in the front-rear direction. Winding 6 is wound around the magnetic pole tooth 301.

The arm portion 302 is a soft magnetic material extending in the vertical direction on both outer sides of the winding 6 and the mover 2 in the left-right direction, and the magnetic flux emitted from the permanent magnet magnetic pole 210 and entering the magnetic pole teeth 301 is transmitted. It can be guided to another magnetic pole tooth 301 facing the magnetic pole tooth 301. As a result, the core 300 has a magnetic pole tooth 301, a permanent magnet magnetic pole 210 facing the magnetic pole tooth 301, and a magnetic pole facing the permanent magnet magnetic pole 210 on a surface opposite to the side facing the magnetic pole tooth 301. A magnetic path including the teeth 301 and the arm 302 can be formed.

≪Spacer 310≫
The spacer 310 can pass the magnetic flux flowing through the adjacent core 300. The spacer 310 can be configured, for example, by laminating electromagnetic steel sheets in the front-rear direction. Therefore, the armature 3 in which the spacer 310 is arranged between the two cores 300 is a magnetic path including the two adjacent cores 300 and the permanent magnet magnetic pole 210 according to the design such as the distance between the permanent magnet magnetic poles 210 in the front-rear direction. Can be formed.

≪End member 4≫
The end member 4 can be formed of a soft magnetic material or a non-magnetic material. The end member 4 is fixed together with itself, the core 300, and the spacer 310 by a fixing member such as a through bolt (not shown) extending in the front-rear direction. Further, a support member such as a bearing 5 is arranged on the end member 4 to support the mover 2.

≪Movable child 2≫
The mover 2 has a longitudinal direction in the front-rear direction. The mover 2 includes a magnetic pole frame 200 made of a non-magnetic material or a soft magnetic material that fixes a plurality of permanent magnets in the front-rear direction, a permanent magnet magnetic pole 210 provided in the magnetic pole frame 200, and left-right end portions of the magnetic pole frame 200. It has a holding member 220 provided at (side end portion). The mover 2 of this embodiment has a mode in which 10 permanent magnet magnetic poles 210 are fixed, but may be 10 or more or less. The permanent magnet magnetic poles 210 are magnetized in the vertical direction, and the upper surfaces of the adjacent magnetic poles 210 are arranged so that the north pole and the south pole alternate.

Further, the mover 2 is arranged in the space between the two magnetic pole teeth 301 and between the two arm portions 302. The permanent magnet magnetic pole 210 can be formed into a flat plate shape that is perpendicular to the vertical direction. In this embodiment, the vertical direction is the direction in which the polarities of the magnetic pole teeth 301 and the polarities of the permanent magnet magnetic poles 210 face each other.

As described above, in this embodiment, the mover 2 is composed of a field magnet.

≪Pole frame 200≫
The magnetic pole frame 200 can be in the shape of a ladder having a plurality of voids 200a for fitting the permanent magnet magnetic poles 210. By fitting the permanent magnet magnetic pole 210 into the gap 200a, the permanent magnet magnetic pole 210 is fixed to the magnetic pole frame 200 without coming off in the left-right direction and the front-back direction. That is, the gap 200a is formed as a through hole that penetrates the magnetic pole frame 200 in the vertical direction, and constitutes an fitting portion into which the permanent magnet magnetic pole 210 is fitted in the vertical direction. By arranging the permanent magnet magnetic pole 210 in the gap 200a so as to fill the gap (fitting portion) 200a, misalignment in the left-right direction and the front-back direction is prevented. The gap (fitting portion) 200a may be formed of a recess to which the permanent magnet magnetic pole 210 can be attached. This recess is formed in a concave shape on one end surface of the magnetic pole frame 200 in the vertical direction. This recess can also be regarded as a kind of gap (fitting portion) 200a into which the permanent magnet magnetic pole 210 is fitted. The magnetic pole frame 200 may be formed of a soft magnetic material or a non-magnetic material.

≪Permanent magnet magnetic pole 210≫
The permanent magnet magnetic pole 210 may be made of a rare earth magnet such as a neodymium magnet, or a permanent magnet made of another material such as a ferrite magnet may be used.

<< Holding member 220 >>
The sandwiching member 220 is located at the left-right direction (width direction) end of the mover 2, and is in contact with the left-right end (side end) of both the magnetic pole frame 200 and the permanent magnet magnetic pole 210 on the upper surface and the lower surface. It is provided in. When the sandwiching member 220 is in contact with the left-right end of the permanent magnet magnetic pole 210 on the upper surface and the lower surface, the permanent magnet magnetic pole 210 is fixed to the magnetic pole frame 200 without coming off in the vertical direction.

The sandwiching member 220 is a frame side end mounting member provided at each of both side ends of the magnetic pole frame 200 in the left-right direction (width direction, second direction), and is a frame-side end mounting member, and is provided in the vertical direction (thickness direction, third direction). (Direction) abuts on the end face of the permanent magnet magnetic pole 210 to prevent the permanent magnet magnetic pole 210 from coming off from the gap (fitting portion) 200a.
For this purpose, as shown in FIG. 2, the sandwiching member 220 includes an upper side portion (first projecting portion) 220a in contact with the side edge portion of the upper surface of the magnetic pole frame 200 and the permanent magnet magnetic pole 210, and the magnetic pole frame 200 and the permanent magnet magnetic pole. A lower side portion (second projecting portion) 220b in contact with the side edge portion of the lower surface of the 210, and a connecting portion (connecting side) 220c connecting the upper side portion 220a and the lower side portion 220b are provided. The upper side portion (first projecting portion) 220a is centered from the side end portion of the field magnet 2 along the left-right direction (second direction) on one end face side in the vertical direction (third direction) of the permanent magnet magnetic pole 210. It is configured to protrude toward the portion and abuts on the permanent magnet magnetic pole 210 on one end face side in the vertical direction of the permanent magnet magnetic pole 210. The lower side portion (second projecting portion) 220b is centered from the side end portion of the field magnet 2 along the left-right direction (second direction) on the other end face side in the vertical direction (third direction) of the permanent magnet magnetic pole 210. It is configured to protrude toward the portion and abuts on the permanent magnet magnetic pole 210 on the other end face side in the vertical direction of the permanent magnet magnetic pole 210. The upper side portion 220a, the lower side portion 220b, and the connecting portion 220c form an fitting recess 220d into which the side end portion (side edge portion) of the magnetic pole frame 200 and the permanent magnet magnetic pole 210 is fitted.

The sandwiching member 220 and the magnetic pole frame 200 are fixed by using a tight fitting such as press fitting, shrink fitting, or cold fitting. Alternatively, the sandwiching member 220 and the magnetic pole frame 200 may be fitted by a clearance fit, and the sandwiching member 220 may be fixed to the magnetic pole frame 200 by using a screw or a knock pin. Alternatively, any of the above-mentioned tightening fits may be used in combination with a screw or a knock pin.

When the tightening fit and the screw or the knock pin are used together, the holding member 220 and the magnetic pole frame 200 are fixed by any of the above-mentioned tightening fits, and the holding member 220 is pulled out (falls off) from the magnetic pole frame 200 by the screw or the knock pin. ) Should be prevented. That is, a knock pin or a screw is provided so as to straddle the holding member (frame side end mounting member) 220 and the magnetic pole frame 200 along the vertical direction (third direction), and the holding member 220 falls off from the magnetic pole frame 200. A fall-prevention structure is configured to prevent.

In this embodiment, the upper and lower surfaces of the sandwiching member 220 are used as a guide rail that slides facing the sliding bearing or the rolling bearing. That is, rail surfaces are formed on the upper surface of the upper side portion 220a of the sandwiching member 220 and the lower surface of the lower side portion 220b, respectively. By forming the guide rail with the sandwiching member 220, it is not necessary to provide other guide rail parts, and the number of parts and the assembly man-hours can be reduced.

Further, in this embodiment, the permanent magnet magnetic pole 210 and the holding member 220 in contact with the upper surface and the lower surface are integrally formed (one member), and the upper guide rail surface and the lower guide rail surface of the holding member 220 are formed. The distance between them is affected only by the processing accuracy of the sandwiching member 220. Therefore, the distance between the upper and lower guide rail surfaces can be maintained with high accuracy and constant. Thereby, in this embodiment, the vertical position of the movable element 2 can be accurately arranged. Therefore, the sliding loss in the bearing 5 can be reduced and the linear motor can be driven with high efficiency.

A fixed structure of the sandwiching member 220 and the magnetic pole frame 200 will be described with reference to FIG. 4A. FIG. 4A is a schematic view showing a cross section of the peripheral portion of the movable element of the linear motor according to the first embodiment, which is perpendicular to the front-rear direction.

In this embodiment, the holding member 220 and the magnetic pole frame 200 are fixed by press fitting, and a knock pin 250 is provided so as to prevent the holding member 220 from coming off (falling off) from the magnetic pole frame 200.

The sandwiching member 220 has an fitting recess 220d formed by an upper side portion 220a, a lower side portion 220b, and a connecting portion 220c, and a side end portion (side edge portion) of the magnetic pole frame 200 is fitted in the fitting recess 220d. Therefore, the holding member 220 is held by the magnetic pole frame 200 in the vertical direction. Further, since the sandwiching member 220 and the magnetic pole frame 200 are assembled by press fitting, the sandwiching member 220 is in a state of being fixed to the side end portion (side edge portion) of the magnetic pole frame 200. However, in order to surely prevent the holding member 220 from coming off from the magnetic pole frame 200 during operation, the knock pin 250 is provided in this embodiment.

The press-fitting hole 200b for press-fitting the knock pin 250 is provided in the magnetic pole frame 200, and the diameter (inner diameter) of the press-fitting hole 200b is slightly smaller than the diameter (outer diameter) of the knock pin 250.
On the other hand, the insertion hole 220e on the holding member 220 side through which the knock pin 250 is inserted is formed in the upper side portion 220a and the lower side portion 220b with a diameter (inner diameter) larger than the diameter of the press-fitting hole 200b and the diameter of the knock pin 250. ing.

The knock pin 250 penetrates the press-fitting hole 200b of the magnetic pole frame 200, one end (upper end) is located in the insertion hole 220e of the upper side 220a, and the other end (lower end) is the insertion of the lower side 220b. It is provided so as to be located in the hole 220e.

In this embodiment, the knock pin 250 is provided to prevent the holding member 220 from coming off from the magnetic pole frame 200, and does not require a fixing force by the knock pin 250. Therefore, the knock pin 250 is press-fitted into the press-fitting hole 200b of the magnetic pole frame 200, and is not press-fitted into the insertion hole 220e of the holding member 220. That is, there is a gap (clearance) between the outer circumference of the knock pin 250 and the inner circumference of the insertion hole 220e. In this case, the knock pin functions as a locking portion for locking so as to prevent the holding member 220 from coming off.

In this embodiment, the knock pin 250 is press-fitted to the magnetic pole frame 200 side, and since there is a gap between the knock pin 250 and the insertion hole 220e, no load (pressure input) acts on the holding member 220 when the knock pin 250 is press-fitted. Therefore, it is possible to prevent the upper guide rail (upper side portion) 220a and the lower guide rail (lower side portion) 220b of the sandwiching member 220 from being deformed, and it is possible to suppress variations in the flatness of the guide rails 220a and 220b. .. Further, since no load is applied to the guide rails 220a and 220b, the wall thickness of the upper side portion 220a, the lower side portion 220b and the connecting portion 220c can be reduced, and the holding member 220 can be made lighter and smaller. By reducing the weight of the sandwiching member 220, the linear motor can be driven with high efficiency, and by reducing the size of the sandwiching member 220, the linear motor can be miniaturized.

A spring pin may be used instead of the knock pin 250, and the spring pin may be inserted into the press-fitting hole 200b and fixed.

In this embodiment, the sandwiching member 220 and the magnetic pole frame 200 are in close contact with each other by fixing the sandwiching member 220 and the magnetic pole frame 200 by using a fastener. Therefore, if the load applied to the sandwiching member 220 at the time of press fitting is small, the deformation of the guide rails 220a and 220b can be suppressed. Therefore, the diameter (inner diameter) of the insertion hole 220e is made slightly smaller than the diameter (outer diameter) of the knock pin 250, and the diameter (inner diameter) of the press-fitting hole 200b is made slightly larger than the diameter (outer diameter) of the knock pin 250. The knock pin 250 may be press-fitted into the insertion hole 220e. That is, the insertion hole 220e and the press-fitting hole 200b of the first embodiment may be exchanged. However, since deformation may occur depending on the magnitude of the load at the time of press-fitting or the hardness of the material, it is preferable to provide the press-fitting hole 200b on the holding member 220 side when minute deformation is a problem.

In this embodiment, by using the knock pin 250, it is only necessary to provide an insertion hole 220e having a small diameter in the upper side portion 220a and the lower side portion 220b constituting the guide rail surface. On the other hand, when a screw is used, in order to prevent the head of the screw from protruding to the guide rail surface, it is necessary to provide a counterbore for burying the head of the screw in the upper side portion 220a or the lower side portion 220b. A large opening will be formed on the rail surface. In addition, when screws are used, it is necessary to take measures to prevent the screws from loosening. However, since the knock pin 250 is used in this embodiment, it is not necessary to take such measures.

[Change example 1]
An example of modification (modification example 1) of the fixed structure between the sandwiching member 220 and the magnetic pole frame 200 in the first embodiment will be described with reference to FIG. 4B. FIG. 4B is a schematic view showing a cross section of the peripheral portion of the movable element of the linear motor according to the modified example (modified example 1) of the first embodiment, which is perpendicular to the front-rear direction.

In the first embodiment, the knock pin 250 is penetrated through the press-fitting hole 200b of the magnetic pole frame 200, but in this modified example, the knock pin 250 is press-fitted into a part of the magnetic pole frame 200 in the vertical direction (thickness direction). That is, the knock pin 250 is press-fitted to the middle of the magnetic pole frame 200 in the vertical direction (thickness direction). In this case, the press-fitting hole 200b of the magnetic pole frame 200 may be formed so as to penetrate the magnetic pole frame 200 in the vertical direction, or may be formed as a bottomed recess (round hole).

In this modification, the knock pin 250 is press-fitted from above to the bottom of the magnetic pole frame 200, and the insertion hole 220e of the knock pin 250 is provided in the upper side portion 220a of the sandwiching member 220. Since the insertion hole 220e is not provided in the lower side portion 220a of the sandwiching member 220, it is advantageous as a configuration of the guide rail surface. Further, since the number of insertion holes 220e to be machined in the sandwiching member 220 can be reduced, the number of machining steps is reduced and the productivity is improved. On the premise that it will not be used, the insertion hole 220e may be formed in the lower side portion 220a of the sandwiching member 220, for example, for reasons such as standardization of parts.

The knock pin 250 may be press-fitted from below to the top of the magnetic pole frame 200, and the insertion hole 220e of the knock pin 250 may be provided in the lower side portion 220b of the sandwiching member 220.

In this modification, the sandwiching member 220 on the right side and the sandwiching member 220 on the left side are formed in the same shape as in FIG. 4C, and the front end and the rear are used depending on whether they are used on the right side or the left side. It may be used by exchanging the side end.

In this modification, the configurations other than those described above are the same as those in the first embodiment, and the configurations described in the first embodiment can be adopted except for the above-mentioned changes.

[Change example 2]
An example of modification (modification 2) of the fixed structure between the sandwiching member 220 and the magnetic pole frame 200 in the first embodiment will be described with reference to FIG. 4C. FIG. 4C is a schematic view showing a cross section of the peripheral portion of the movable element of the linear motor according to the modified example (modified example 2) of the first embodiment, which is perpendicular to the front-rear direction.

In this modification, the knock pin 250 on the right side of FIG. 4C is press-fitted from the lower side to the upper side of the magnetic pole frame 200 with respect to the modification example 1, and the insertion hole 220e of the knock pin 250 is formed on the lower side of the holding member 220. It is provided in the portion 220b. That is, in the sandwiching member 220 arranged at both side end portions (side edge portions) of the magnetic pole frame 200, the sandwiching member 220 arranged at one side end portion and the sandwiching member 220 arranged at the other side end portion are used. , The press-fitting direction of the knock pin 250 is set to be upside down.

In FIG. 4C, the knock pin 250 that is press-fitted from the upper side to the lower side and the knock pin 250 that is press-fitted from the lower side to the upper side may be interchanged on the left and right sides.

In this modified example, the sandwiching member 220 on the right side and the sandwiching member 220 on the left side are formed in the same shape in FIG. You may.

[Change example 3]
An example of modification (modification 3) of the fixed structure between the sandwiching member 220 and the magnetic pole frame 200 in the first embodiment will be described with reference to FIG. 4D. FIG. 4D is a schematic view showing a cross section of the peripheral portion of the movable element of the linear motor according to the modified example (modified example 3) of the first embodiment, which is perpendicular to the front-rear direction. This modification is the same as that of the first embodiment except for the following points, and the configurations described in the first embodiment and the first and second modifications can be adopted except for the following changes.

In this modification, the knock pin 250 is changed to a screw 260 and the press-fitting hole 200b of the magnetic pole frame 200 is changed to a screw hole 200c with respect to the modification 1. In this case, the insertion hole 220e becomes an insertion hole for the screw 260, and the magnitude relationship between the diameter (outer diameter) of the screw 260 and the diameter (inner diameter) of the insertion hole 220e is the diameter (outer diameter) of the knock pin 250 in the first embodiment. This is the same as the magnitude relationship with the diameter (inner diameter) of the insertion hole 220e.

In this modified example, a counterbore 220f for burying the head of the screw 260 is provided at the upper end of the insertion hole 220e of the screw 260 provided in the upper side portion 220a of the holding member 220. Therefore, a recess (counterbore 220f) having a diameter larger than the diameter of the insertion hole 220e is formed on the guide rail surface.

When the screw 260 is used, a load acts on the upper guide rail (upper side portion) 220a of the holding member 220 by tightening the screw 260. However, by fixing the sandwiching member 220 and the magnetic pole frame 200 by press fitting, shrink fitting, or tightening fitting such as cold fitting, the sandwiching member 220 and the magnetic pole frame 200 are in close contact with each other, and the upper side is formed. Deformation of the guide rail (upper side portion) 220a can be suppressed. However, since deformation may occur depending on the hardness of the material, it is preferable to use the knock pin 250 when minute deformation is a problem.

In this modified example, the configurations other than those described above have the same configurations as those of the first embodiment, the first modified example, and the second modified example. Further, the arrangement of the screw 260 and the screw hole 200c can be changed in the same manner as the arrangement of the holding member 220 and the magnetic pole frame 200 described in the above-described embodiment and each modification.

[Example 2]
A fixed structure of the sandwiching member 220 and the magnetic pole frame 200 will be described with reference to FIG. 5A. FIG. 5A is a schematic cross-sectional view of the peripheral portion of the movable element of the linear motor according to the second embodiment, which is perpendicular to the front-rear direction. The configuration of the second embodiment is the same as that of the first embodiment except for the following points, and the configurations described in the first embodiment and the first to third modifications can be adopted except for the following configurations according to the present embodiment. ..

In this embodiment, both end faces (side end portions) 210d of the permanent magnet magnetic pole 210 in the left-right direction are formed of a tapered surface 230d having a tapered shape. The inner surface (inner peripheral surface) of the gap 200a of the magnetic pole frame 200 facing the end portion (side end portion) 210d of the permanent magnet magnetic pole 210 is composed of a tapered surface 230e forming a taper shape along the tapered surface 230d. The permanent magnet magnetic pole 210 is fitted in the gap 200a so that the tapered surface 230d abuts on the tapered surface 230e of the magnetic pole frame 200. The tapered surface 230d and the tapered surface 230e form a tapered portion 230 on a surface where the permanent magnet magnetic pole 210 and the magnetic pole frame 200 are in contact with each other.

The sandwiching member 220 and the magnetic pole frame 200 are fixed in the same manner as in the first embodiment and the first and second modifications. In this embodiment, the knock pin 250 is used for assembling the holding member 220 to the magnetic pole frame 200, and the knock pin 250 can be configured in the same manner as in the first embodiment and the first and second modifications.

Since the end portions 210d on both sides of the permanent magnet magnetic pole 210 are formed in a tapered shape, the length in the left-right direction decreases from the bottom to the top. The sandwiching member 220 is provided so as to be in contact with the upper surface and the lower surface of the magnetic pole frame 200 and to be in contact with the lower surface of the left-right end portion (side end portion) of the permanent magnet magnetic pole 210.

In the permanent magnet magnetic pole 210, the tapered surface 230d does not come into contact with the tapered surface 230e of the magnetic pole frame 200 in the upward direction, and the lower surface of the permanent magnet magnetic pole 210 does not come out in the downward direction due to contact with the lower side portion 220b of the sandwiching member 220. It is fixed to the magnetic pole frame 200.

Further, by providing the tapered surface 230d, the length of the upper surface of the permanent magnet magnetic pole 210 in the left-right direction can be made shorter than the length of the lower surface in the left-right direction, and the amount of magnet used can be reduced as compared with the first embodiment.

The tapered surface 230d and the tapered surface 230e may be configured so that the length of the permanent magnet magnetic pole 210 in the left-right direction decreases from top to bottom. In this case, the holding member 220 is provided so as to be in contact with the upper surface and the lower surface of the magnetic pole frame 200 and to be in contact with the upper surface of the left-right end portion (side end portion) of the permanent magnet magnetic pole 210.

That is, in this embodiment, the permanent magnet magnetic pole 210 and the gap (fitting portion) 200a of the magnetic pole frame 200 have dimensions in the left-right direction (second direction) from one end face side to the other end face in the vertical direction (third direction). It is configured to have a tapered portion 230 that becomes smaller toward the side. The sandwiching member 220 is configured to abut on the end face of the permanent magnet pole 210 on the end face side having a large dimension in the left-right direction (second direction) of the permanent magnet pole 210.

[Change example 4]
An example of modification (modification 4) of the fixed structure between the sandwiching member 220 and the magnetic pole frame 200 in the second embodiment will be described with reference to FIG. 5B. FIG. 5B is a schematic cross-sectional view of the peripheral portion of the movable element of the linear motor according to the modified example (modified example 4) of the second embodiment, which is perpendicular to the front-rear direction.

In this modification, the screw 260 is used instead of the knock pin 250 of the second embodiment. Since the tapered surface 230d and the tapered surface 230e are configured so that the length of the permanent magnet magnetic pole 210 in the left-right direction decreases from the bottom to the top, the screw 260 is tightened from the lower side (lower side portion 220b side). do. As a result, the magnetic pole frame 200 is tightened toward the lower side portion 220b side of the sandwiching member 220. Therefore, the sandwiching member 220 can be assembled to the magnetic pole frame 200 so that the tapered surface 230d and the tapered surface 230e are in close contact with each other. As a result, it is possible to reliably prevent the permanent magnet magnetic pole 210 from being displaced in the vertical direction.

When the tapered surface 230d and the tapered surface 230e are configured so that the length of the permanent magnet magnetic pole 210 in the left-right direction decreases from top to bottom, the screw 260 is tightened from the upper side (upper side portion 220a side).

That is, in this modification, the screw 260 is fastened to the end face (lower surface) of the holding member 220 and the magnetic pole frame 200 from the end face side having a large dimension in the left-right direction (second direction) of the permanent magnet magnetic pole 210.

Other configurations are the same as those of the second embodiment, and the configurations described in the first, third and second embodiments can be adopted except for the above-mentioned changes.

[Example 3]
A fixed structure of the sandwiching member 220 and the magnetic pole frame 200 will be described with reference to FIG. FIG. 6 is a schematic cross-sectional view of the peripheral portion of the movable element of the linear motor according to the third embodiment, which is perpendicular to the front-rear direction. The configuration of Example 2 is the same as that of Example 1 except for the following points, and the configurations described in Example 1, Examples 2 and 1-4 can be adopted except for the following changes.

In this embodiment, the magnetic pole frame 200 is divided into upper and lower parts, and the upper magnetic pole frame member (first magnetic pole frame member) 200f arranged on one end surface side in the vertical direction (third direction) of the permanent magnet magnetic pole 210 and It is composed of 200 g of a lower magnetic pole frame member (second magnetic pole frame member) arranged on the other end surface side of the permanent magnet magnetic pole 210. In this case, the gap (fitting portion) 200a is formed so as to straddle the upper magnetic pole frame member 200f and the lower magnetic pole frame member 200g.

The upper side edge portions 210f at both ends of the permanent magnet magnetic pole 210 in the left-right direction are formed of a tapered surface 230f having a tapered shape. The lower side edge portions 210 g of both ends of the permanent magnet magnetic pole 210 in the left-right direction are formed of a tapered surface 230 g having a tapered shape.

The inner surface (inner peripheral surface) 200m of the gap 200a of the upper magnetic pole frame member 200f facing the tapered surface 230f of the permanent magnet magnetic pole 210 has a tapered surface 230m tapered along the tapered surface 230f. The inner surface (inner peripheral surface) 200n of the gap 200a of the lower magnetic pole frame member 200g facing the tapered surface 230g of the permanent magnet magnetic pole 210 has a tapered surface 230n that forms a taper along the tapered surface 230g.

The permanent magnet magnetic pole 210 is fitted in the gap 200a so that the tapered surfaces 230f, 230g are in contact with the tapered surfaces 230m, 200n of the magnetic pole frames 200f, 200g. The tapered surfaces 230f, 230g and the tapered surfaces 230m, 200n form a tapered portion 230 on the surface where the permanent magnet magnetic pole 210 and the magnetic pole frame 200 are in contact with each other.

That is, in this embodiment, the one end face side of the permanent magnet magnetic pole 210 and the gap (fitting portion) 200a of the upper magnetic pole frame member (first magnetic pole frame member) 200f are one of the above along the vertical direction (third direction). It has a first tapered portion 230 whose dimensions in the left-right direction (second direction) become smaller as it approaches the end face side of the magnet. Further, the other end face side of the permanent magnet magnetic pole 210 and the gap (fitting portion) 200a of the lower magnetic pole frame member (first magnetic pole frame member) 200 g are located on the other end face side along the vertical direction (third direction). It has a second tapered portion 230 whose dimensions in the left-right direction (second direction) become smaller as it approaches.

The permanent magnet magnetic pole 210 is fixed by the tapered portion 230 without coming off in either the upward or downward direction. The upper and lower magnetic pole frames 200f and 200g divided into two are assembled by sandwiching the vertically divided magnetic pole frames 200f and 200g using the sandwiching member 220. In this case, the sandwiching member 220 and the magnetic pole frames 200f, 200g are fixed by any method (configuration) described in each of the above-described embodiments and modifications. That is, the sandwiching member 220 and the magnetic pole frame 200 can be fixed by press fitting, shrink fitting, or tightening fitting such as cold fitting. Alternatively, it may be fixed by screwing or using a knock pin.
Alternatively, a tightening fit may be used in combination with screwing or fixing with a knock pin. Alternatively, the sandwiching member 220 and the magnetic pole frame 200 may be fixed by tightening, and the sandwiching member 220 may be prevented from coming off from the magnetic pole frame 200 by screwing or using a knock pin.

In this embodiment, the holding member 220 is in contact with the left-right end of the magnetic pole frame 200f, 200g divided into upper and lower parts on the upper surface and the lower surface, so that the magnetic pole frame 200f, 200g is not divided in the vertical direction, and the permanent magnet magnetic pole 210 is formed. It can be fixed to the magnetic pole frame 200. Also in this case, the upper and lower surfaces of the holding member 220 are used as a guide rail that slides facing the sliding bearing or the rolling bearing.

A reference example relating to the present invention will be described with reference to FIG. 7. FIG. 7 is a schematic cross-sectional view of the peripheral portion of the movable element of the linear motor according to the reference example of the third embodiment, which is perpendicular to the front-rear direction. The magnetic pole frames 200f, 200g can be fixed by screwing or using a knock pin without using the holding member 220. Alternatively, the magnetic pole frames 200f and 200g can be fixed by welding.

However, in this case, both ends of the magnetic pole frames 200f and 200g in the left-right direction serve as guide rail surfaces. Therefore, there is a problem that the variation in the spacing dimension between the upper and lower guide rail surfaces becomes large, and there is a problem that the inclination of the upper and lower guide rail surfaces in the vertical direction becomes large.

[Example 4]
A fixing structure of the holding member 220 and the magnetic pole frame 200 will be described with reference to FIG. FIG. 8 is a schematic cross-sectional view of the peripheral portion of the movable element of the linear motor according to the fourth embodiment, which is perpendicular to the front-rear direction. As the configuration of the fourth embodiment, the configurations described in the first to third embodiments and the first to fourth embodiments can be adopted except for the following points.

The non-magnetic sheet 240 is arranged on the upper surface and the lower surface of the magnetic pole frame 200 and the permanent magnet magnetic pole 210, and the non-magnetic sheet 240 is sandwiched and fixed from the vertical direction by the holding member 220 and the magnetic pole frame 200. The non-magnetic sheet 240 fixes the permanent magnet magnetic pole 210 to the magnetic pole frame 200 without coming off in the vertical direction.

The sandwiching member 220 is a frame side end mounting member provided at each of both side ends of the magnetic pole frame 200 in the left-right direction (width direction, second direction), and the non-magnetic sheet 240 is referred to as the magnetic pole frame 200. It is sandwiched and held between the two to prevent the permanent magnet magnetic pole 210 from coming off from the gap (fitting portion) 200a.

The non-magnetic sheet 240 makes it necessary to widen the gap between the permanent magnet magnetic pole 210 and the magnetic pole teeth 301, but when a non-magnetic metal such as stainless steel is used as the material of the non-magnetic sheet 240, it is thin due to its high strength. And the magnetic gap can be reduced. On the other hand, when a non-magnetic metal is used, an eddy current is generated inside the metal, which may cause loss or heat generation. When a non-metal such as a resin is used as the material of the non-magnetic sheet 240, no eddy current is generated, and loss and heat generation in the non-magnetic sheet 240 can be eliminated.

In this embodiment, the knock pin 250 and the screw 260 described in Examples 1-3 and Modification 1-4 may be used in combination.

Further, also in this embodiment, the holding member 220 constitutes a guide rail, and the upper surface and the lower surface of the holding member 220 form a guide rail surface.

[Example 5]
FIG. 9A is a perspective view showing an embodiment (Example 5) of a compressor using a linear motor according to the present invention. FIG. 9B is a cross-sectional view of a main part showing an embodiment (Example 5) of a compressor using a linear motor according to the present invention. The same reference numerals are given to the same configurations as those in the above-described embodiment, and the description thereof will be omitted.

The compressor 1000 of this embodiment can be used as a gas compressor for compressing a gas such as air, nitrogen gas, or oxygen, as well as a refrigerant, and the reciprocating direction of the mover 2 can be one side of the armature 3. The resonance spring 400 provided in the above, the piston (located in the piston 1200, not shown) provided on the other side of the armature 3, the cylinder 1200, the solenoid valve 1400 (1400A, 1400B), the exhaust valve 1500, the dryer 1600, and It has an inverter 1700.

In the compressor 1000 of this embodiment, the drive motor of the piston 1100 is composed of a linear motor, and the mover 2 has a flat plate shape (flat plate shape). Further, the mover 2 protrudes further rearward from the rear end portion of the end member 4.

A casing 1800 for accommodating the armature 3 and the resonance spring 400 is attached to the cylinder 1200. In this embodiment, the end member 4 is used as the front surface of the casing 1800, but a member constituting the front surface of the casing 1800 may be provided on the front side of the end member 4.
That is, instead of using the end member 4 as the front member of the casing 1800, a front member may be provided separately from the end member 4.

The casing 1800 is composed of a cylindrical side surface (side surface member) 1810 and a rear surface (rear surface member, bottom surface member) 1820 as separate bodies, and the bottom surface 1820 is based on the cylinder 1200 by the insertion portion 1830 extending in the front-rear direction. It is fixed via a plate 1900. As a result, the side surface 1810 is sandwiched between the rear surface 1820 and the cylinder 1200.

The electrode projects forward from the casing 1800 side, and the lead-out end of the winding 6 is electrically connected to one end of the electrode. The other end of the electrode is inserted into the inverter 1700 through a through hole (not shown) formed in the base plate 1900 and is electrically connected to the internal inverter circuit.

The base plate 1900 is provided with a gas suction / discharge port 1910. Here, the gas is a refrigerant or the like in addition to the above-mentioned air, nitrogen gas, or a gas such as oxygen. Further, two solenoid valves 1400A and 1400B are attached to the base 1900, and two through holes (gas passages) 1920a and 1920b through which gas flows are provided corresponding to the respective solenoid valves 1400A and 1400B. The solenoid valves 1400A and 1400B are three-way valves and constitute a gas intake / discharge valve. When one solenoid valve 1400A is in the suction state, the other solenoid valve 1400b is in the discharge state. On the other hand, the solenoid valve 1400A allows the gas sucked from the suction discharge port 1910 in the suction state to flow into the casing 1800 through the through hole 1920a. At this time, the other solenoid valve 1400B is in the discharge state and shuts off the flow of gas through the through hole 1920b.

The gas that has flowed into the casing 1800 through the solenoid valve 1400A flows through the gap between the mover 2 and the end member 4 and the base plate 1900, flows inside the cylinder 1200, and flows to the dryer 1600 through the cylinder 1200. Further, the gas is discharged from the dryer 1600 through the other solenoid valve 1400B. When the suction and discharge states of the solenoid valve 1400A and the solenoid valve 1400B are switched, the gas flow follows the reverse of the above-mentioned path. The cylinder 1200 compresses the inflowing gas as needed. On the side of the base plate 1900 where the through hole 1920b is provided, a suction / discharge port (not shown) is provided at a position corresponding to the suction / discharge port 1910.

A dryer 1600 is attached to the cylinder head 1200A of the cylinder 1200 so as to be able to communicate with the inside of the cylinder 1200.

[Example 6]
FIG. 10 is a block diagram of the refrigerator according to the sixth embodiment. The same components as those in the above-described embodiment are designated by the same reference numerals, and the description thereof will be omitted.

The refrigerator 2001 is provided with a left-right split refrigerating room door 2002a on the front side of the refrigerating room 2002, and is located on the front side of the ice making room 2003, the upper freezing room 2004, the lower freezing room 2005, and the vegetable room 2006. Each of them is provided with a pull-out type ice making room door 2003a, an upper freezing room door 2004a, a lower freezing room door 2005a, and a vegetable room door 2006a.

A machine room 2020 is provided on the back side of the vegetable room 2006, and a compressor 2020 is arranged in the machine room 2020. Further, an evaporator chamber 2008 is provided on the back side of the ice making chamber 2003, the upper freezing chamber 2004, and the lower freezing chamber 2005, and the evaporator 2007 is provided in the evaporator chamber 2008. In the refrigerator 2001, in addition to the compressor 2024 and the evaporator 2007, a radiator (not shown), a capillary tube as a depressurizing means, a three-way valve, and the like are connected by a refrigerant pipe to form a refrigerating cycle 2030.

In this embodiment, the linear motor 100 of any of the above-described embodiments is adopted for the compressor 2024 constituting the refrigerating cycle 2030 of the refrigerator 2001. For example, the compressor 1000 of the fifth embodiment may be adopted as the compressor 2024. As a result, it is possible to suppress the enlargement of the compressor 2024 constituting the refrigeration cycle 2030. Then, it becomes possible to secure a large space for the refrigerating room and the freezing room, and it becomes possible to provide a large-capacity refrigerator without increasing the external dimensions.

[Example 7]
FIG. 11 is a configuration diagram of the vehicle air suspension according to the seventh embodiment. The same components as those in the above-described embodiment are designated by the same reference numerals, and the description thereof will be omitted.

In this embodiment, a case where a vehicle air suspension is mounted on a vehicle such as a four-wheeled vehicle will be described as an example.

The vehicle body 3002 constitutes the body of the vehicle 3001. On the lower side of the vehicle body 3002, a total of four wheels 3003 including left and right front wheels and left and right rear wheels are provided. The air suspension 3004 includes four air springs 3005 provided between the vehicle body 3002 and each wheel 3003, an air compressor 3006, a valve unit 3008, and a controller 3011. Then, the air suspension 3004 adjusts the vehicle height by supplying and discharging compressed air from the air compressor 3006 to each air spring 3005.

In this embodiment, the linear motor 100 of any of the above-described embodiments is adopted as the drive motor of the air compressor 3006. For example, the compressor 1000 of the fifth embodiment may be adopted as the air compressor 3006. The air compressor 3006 is connected to the valve unit 3008 through a supply / exhaust pipe line (pipe) 3007. The valve unit 3008 is provided with four supply / discharge valves 3008a made of solenoid valves, which are provided for each wheel 3003. A branch pipeline (pipe) 3009 is provided between the valve unit 3008 and the air spring 3005 of each wheel 3003. The air spring 3005 is connected to the air compressor 3006 via the branch line 3009, the valve 3008a, and the supply / discharge line 3007. Then, the valve unit 3008 opens and closes the supply / discharge valve 3008a in response to a signal from the controller 3011 to supply / discharge compressed air to each air spring 3005 and adjust the vehicle height.

In this embodiment, it is possible to suppress the enlargement of the air compressor 3006 constituting the air suspension 3004. Then, the mounting space of the air compressor 3006 in the vehicle 3001 can be reduced, and the degree of freedom in arranging the air compressor 3006 is increased.

[Other aspects]
In each embodiment, the moving magnet type in which the armature 3 is fixed and the field magnet (movable element 2) moves is exemplified, but a moving coil type in which the field magnet is fixed and the armature 3 is moved may also be used.

Further, instead of providing the magnetic pole teeth 301 in each of the vertical directions of the movable element 2, the movable element 2 may be provided on one side in the vertical direction. In this case, one end of the arm portion 302 can come into contact with the floor surface of the soft magnetic material to support the core 300.
Further, the magnetic pole teeth 301 and the arm portion 302 may be formed by laminating amorphous metal or may be formed of a dust core. When an amorphous metal is used, it has an effect of reducing iron loss generated in the magnetic pole teeth 301 and the arm portion 302, and when a dust core is used, it can be three-dimensionally formed into an arbitrary shape.

The present invention can be applied to various devices for relatively moving the stator 1 and the mover 2 in addition to a motor (linear motor). For example, the same effect can be obtained by using it in a generator, a compressor, an electromagnetic suspension, a positioning device, or the like.

In the linear motor of Patent Document 1, the frame edge holding plate on the upper surface side and the frame edge holding plate on the lower surface side are fastened with bolts for inserting the magnet holding frame from the upper surface side to the lower surface side, and both frames are fastened. The edge holding plate is fixed to the magnet holding frame. On the other hand, in the linear motor of Patent Document 2, bolts are fastened from the side surface of the mover holding member.

In the linear motors of Patent Document 1 and Patent Document 2, the flatness of the edge portion of the magnet holding frame or the mover holding member may vary due to the difference in the tightening force of the bolt. In the linear motor of Patent Document 1, there is a possibility that the thickness dimension of the magnet holding frame in the vertical direction may vary. Further, in the linear motor of Patent Document 2, the distance (width dimension) of both edges may vary.

In Patent Document 1 and Patent Document 2, there is no disclosure about the configuration of the guide rail of the mover, and sufficient consideration is not given to the configuration of the guide rail. When the flatness of the edge portion of the magnet holding frame or the mover holding member varies, the flatness of the guide rail surface becomes higher when the edge portion of the magnet holding frame or the mover holding member is used as the guide rail of the bearing. There is a possibility of obstacles such as deterioration or deterioration of the dimensional accuracy of the guide rail.

In this embodiment, by using the tightening fit and the screw 260 together, it is possible to suppress the variation in flatness that occurs in the sandwiching member 220 even when the screw is used. Further, by using the knock pin 250 or the spring pin described above instead of the screw 260, the variation in flatness can be further suppressed.

The present invention is not limited to the above-described embodiments, and includes various modifications. For example, the above-described embodiment has been described in detail in order to explain the present invention in an easy-to-understand manner, and is not necessarily limited to the one including all the configurations. Further, it is possible to replace a part of the configuration of one embodiment with the configuration of another embodiment, and it is also possible to add the configuration of another embodiment to the configuration of one embodiment. Further, it is possible to add / delete / replace a part of the configuration of each embodiment with another configuration.

1 ... Stator, 2 ... Movable element (field magnet), 3 ... Armature, 4 ... End member, 5 ... Bearing, 6 ... Winding, 100 ... Linear motor, 200 ... Magnetic pole frame, 200b ... Press-fit hole, 210 ... Permanent magnet magnetic pole, 220 ... Holding member (frame side end mounting member), 220a ... Upper guide rail, 220b ... Lower guide rail, 220e ... Knock pin 250 insertion hole, 230 ... Tapered part, 250 ... Knock pin, 300 ... core, 301 ... magnetic pole teeth, 302 ... arm, 310 ... spacer.

Claims (6)

An armature with a monopole and a winding,
A linear motor comprising a permanent magnet magnetic pole and a field magnet having a magnet holding portion for holding the permanent magnet magnetic pole, wherein either the armature or the field magnet is a stator and the other is a mover. hand,
The direction along the moving direction of the mover is the first direction, the direction along the width direction of the field magnet perpendicular to the first direction is the second direction, and the field perpendicular to the first direction and the second direction. When the direction along the thickness direction of the magnet is the third direction,
The magnet holding portion is provided at each of a magnetic pole frame having an fitting portion into which the permanent magnet magnetic pole is fitted in the third direction and both end portions of the magnetic pole frame at both ends in the second direction. In a linear motor having a frame-side end mounting member that abuts on the end face of the permanent magnet pole from three directions, the frame-side end mounting member is the one end face side of the permanent magnet pole in the third direction. Along the second direction at the first projecting portion protruding from the side end portion of the field magnet toward the center portion along the second direction and the other end face side of the permanent magnet magnetic pole in the third direction. The second projecting portion protruding from the side end portion of the field magnet toward the central portion, and the first projecting portion and the second projecting portion provided along the third direction are connected to each other. The connecting portion is integrally configured to form a guide rail that guides the movement of the mover in the first direction , and the rail surface of the guide rail is the first protruding portion and the second protruding portion. Consists of
The frame side end mounting member and the magnetic pole frame are fixed by tightening, and knock pins or screws provided so as to straddle the frame side end mounting member and the magnetic pole frame along the third direction. A linear motor comprising a structure for preventing the frame side end mounting member from falling off from the magnetic pole frame . In the linear motor according to claim 1,
In the frame side end mounting member, the first projecting portion abuts on the permanent magnet magnetic pole on one end surface side of the permanent magnet magnetic pole in the third direction, and the second projecting portion abuts on the permanent magnet magnetic pole. A linear motor characterized in that it abuts on the permanent magnet magnetic pole on the other end face side in the third direction. In the linear motor according to claim 2,
The fall-prevention structure is composed of the screws.
The frame side end mounting member has an inner diameter larger than the outer diameter of the screw and includes an insertion hole through which the screw is inserted.
The linear motor is characterized in that the screw is screwed into a screw hole formed in the magnetic pole frame. In the linear motor according to claim 1,
The permanent magnet magnetic pole and the fitting portion of the magnetic pole frame have a tapered portion whose dimension in the second direction decreases from one end face side to the other end face side in the third direction.
The frame side end mounting member is a linear motor characterized in that the permanent magnet magnetic pole abuts on the end surface side of the permanent magnet magnetic pole having a large dimension in the second direction. In the linear motor according to claim 4,
The fall prevention structure is composed of the screws.
The screw is a linear motor characterized in that the permanent magnet magnetic pole is fastened to the magnetic pole frame and the frame side end mounting member from the end face side having a large dimension in the second direction. A compressor comprising a cylinder and a piston that reciprocates inside the cylinder, and also including the linear motor according to any one of claims 1 to 5 as a drive motor for driving the piston.

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