JP2012016279A - Moving member for linear motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a moving member for linear motors capable of suppressing force applied from a magnet holder to a pair of rails even when the magnet holder undergoes a thermal expansion.SOLUTION: Multiple recesses 29 are formed on a magnet holder 15 at opposite portions facing a pair of rails 19. The recesses 29 are opened in a direction extending from the magnet holder 15 to the pair of rails 19, and in an direction opposing pole faces in which respective pole faces of each of multiple permanent magnets 17 are opposed to each other. Air gaps for absorbing thermal expansion which absorb force applied from the magnet holder 15 to the pair of rails 19 due to the thermal expansion of the magnet holder 15 are formed by the multiple recesses 29.

Description

  The present invention relates to a linear motor movable element used in a linear motor in which a movable element reciprocates with respect to a stator.

  In JP 2003-244930 A (Patent Document 1), a plurality of permanent magnets and a plate-like magnet that holds a plurality of permanent magnets in a permanent magnet holding portion formed of a through hole so that the plurality of permanent magnets form a row. A mover for a linear motor provided with a holder is shown. In this type of linear motor mover, both end portions of a plate-like magnet holder are used instead of the movable shaft. Japanese Patent Laid-Open No. 2001-99151 (Patent Document 2) discloses a linear motor movable element in which a pair of rails are attached to a magnet holder in such a linear motor movable element. The pair of rails are slidably supported by the support portion on the linear motor stator side. Thus, the linear motor movable element reciprocates with respect to the stator.

JP 2003-244930 A JP 2001-99151 A

  However, in the conventional linear motor mover, when the magnet holder is heated and expanded by the heat of the winding on the stator side, a force is applied from the magnet holder to the pair of rails, and the pair of rails further acts on the linear motor stator. There was a problem that the linear motor could not reciprocate accurately due to strong contact with the support.

  Further, in the conventional linear motor mover, when the pair of rails attached to the magnet holder is slidably supported on the support portion on the linear motor stator side, the heat absorption clearance is set to the motor stator or mover. Therefore, there is a problem that the structure of the motor becomes complicated and the cost of the support structure for the mover increases.

  The objective of this invention is providing the needle | mover for linear motors which can suppress the force added to a pair of rail from a magnet holder, even if a magnet holder thermally expands.

  Another object of the present invention is to provide a linear motor movable element that can prevent bending of a magnet holder and that can be reduced in weight.

  Another object of the present invention is to provide a mover for a linear motor that can simplify the support structure of the mover for a linear motor to the support portion on the stator side for the linear motor and can form the support structure for the mover at a low cost. There is.

  The mover for a linear motor targeted by the invention of the present application includes a plurality of permanent magnets, a magnet holder, and a pair of rails. The magnet holder has a plate shape that holds a plurality of permanent magnets in a permanent magnet holding portion formed of a recess or a through hole so that the plurality of permanent magnets form a row. In other words, the magnet holder is configured by forming a permanent magnet holding portion including a plurality of concave portions or through holes into which a plurality of permanent magnets are respectively fitted in a row. The pair of rails are attached to the magnet holder and slidably supported by the support portion of the linear motor stator. In other words, the pair of rails are attached to the magnet holder so as to be along the row of the permanent magnet holding portions and the row is located therebetween. The pair of rails are slidably supported by the support portion of the linear motor stator.

  And in this invention, the magnet holder has the space | gap part for thermal expansion absorption which absorbs the force added to a pair of rail from a magnet holder by thermal expansion of a magnet holder. In other words, the magnet holder absorbs the thermal expansion of the magnet holder so that the stress generated in the magnet holder due to the thermal expansion of the magnet holder is prevented from being applied to the pair of rails from the magnet holder. A space for expansion absorption is formed. If the gap for thermal expansion absorption is provided in the magnet holder as in the present invention, even if the magnet holder is heated and expanded, a part of the thermal expansion is expanded and absorbed in the gap for thermal expansion absorption. As a result, the force applied to the pair of rails from the magnet holder is suppressed by the presence of the thermal expansion absorbing gap. Therefore, it can suppress that the force (pressure) which a pair of rail contacts with respect to the support part of the stator for linear motors becomes larger than necessary, and the linear motor can perform exact reciprocating motion.

  The thermal expansion absorbing gap is formed in a direction facing the pair of rails from the magnet holder to a pair of rails of the magnet holder and a direction of the magnetic pole surface facing each of the magnetic pole surfaces of the plurality of permanent magnets. It can form by the several recessed part (cavity formation recessed part) opened. In other words, the thermal expansion absorbing gap portion opens toward one side in the direction orthogonal to the pair of rails, and opens on both sides in the direction orthogonal to both the direction orthogonal to the pair of rails and the direction in which the rails extend. It can be composed of a plurality of gap forming recesses. The plurality of gap forming recesses are formed at predetermined intervals along the rail. A plurality of contact portions that contact the rail are formed on both sides of the gap forming recess. In this way, when the magnet holder is heated, the inner wall portions of the plurality of gap forming recesses are easily expanded or bulged into the recesses, and the magnet holder and the pair of rails are in contact with each other. The expansion rate (the rate of deformation due to expansion) decreases. Therefore, the force applied to the pair of rails from the magnet holder can be reduced.

  When such a space for absorbing thermal expansion is formed, a plurality of gap forming recesses are formed in the facing portions of the magnet holder facing the pair of rails, so that the plurality of recesses are alternately arranged and a pair of the recesses are formed. A plurality of abutting portions that abut each of the rails are formed. In this case, the rail is fixed to the plurality of contact portions by the fixing means. Various known means can be used as the fixing means. For example, the pair of rails can be attached to the magnet holder by screws inserted through the plurality of through holes provided in the pair of rails and screwed into the plurality of screw holes provided in the contact portion of the magnet holder. . In this case, the screw holes are formed in the plurality of contact portions. If it does in this way, a pair of rail part can be firmly attached to a magnet holder using a screw.

  A magnet holder can be comprised so that it may have a holder main body which has a permanent magnet holding | maintenance part, and a pair of reinforcement part to which a pair of rail is fixed to a holder main body, respectively. In this case, the holder main body is formed of a nonmagnetic material having a specific gravity smaller than that of the pair of reinforcing portions, and the pair of reinforcing portions has higher rigidity than the holder main body. If it does in this way, since a holder main body is formed with a nonmagnetic material whose specific gravity is smaller than a pair of reinforcement parts, magnetic flux short circuit with a north pole and a south pole of a permanent magnet can be prevented. Moreover, the weight reduction of the whole magnet holder can be achieved by reducing the weight of a holder main body. Moreover, it can suppress that magnet holder itself bends by a pair of reinforcement part. When providing a pair of reinforcement part, the several recessed part which comprises the space | gap part for thermal expansion absorption can be formed in a pair of reinforcement part. In this case, when the holder main body and the pair of reinforcing portions are heated and expanded, a force obtained by combining the force applied from the holder main body to the pair of reinforcing portions and the force generated by the expansion of the pair of reinforcing portions is a pair of rails. Will act on the side. However, according to the present invention, the inner wall portion of the plurality of recesses expands or bulges into the gap, and the expansion rate (the rate of deformation due to expansion) of the portion where the magnet holder contacts the pair of rails decreases. . Therefore, the force applied to the pair of rails from the magnet holder can be reduced.

  The thermal expansion absorbing gap can be formed by a plurality of through-holes penetrating the magnet holder between the permanent magnet holding portion and the facing portions facing the pair of rails of the magnet holder. In other words, the thermal expansion absorbing gap can be formed of a plurality of gap forming through holes that open toward both sides in a direction perpendicular to both the direction perpendicular to the pair of rails and the direction in which the rails extend. In this case, the plurality of gap forming through holes are formed at predetermined intervals along the rail. Even in such a configuration, when the magnet holder is heated, the inner wall portions of the plurality of through holes are easily expanded toward the inside of the through holes, and the expansion rate of the portion of the magnet holder that contacts the pair of rails is reduced. (Deformation due to expansion is reduced). Therefore, the force applied to the pair of rails from the magnet holder is suppressed.

  The holder body can be formed from aluminum or synthetic resin, and the pair of reinforcing portions can be formed from iron or an iron alloy. If such a material is used, a magnet holder can be easily formed at low cost.

  Moreover, you may arrange | position an elastic body between a magnet holder and a pair of rail part, respectively. When such an elastic body is disposed, the force applied to the pair of rails from the magnet holder due to thermal expansion can be absorbed by the elastic body, so that the force applied to the pair of rails can be further suppressed.

  A linear motor mover to be improved by another invention of the present application is a permanent magnet holding portion including a plurality of permanent magnets and a plurality of permanent magnets formed of recesses or through holes so that the plurality of permanent magnets form a row. And a magnet holder for holding. In the present invention, a plurality of shafts that protrude from both end portions in the moving direction of the linear motor mover and extend in the moving direction of the linear motor mover are respectively attached to the magnet holder. The plurality of shafts are slidably supported on the support portion of the linear motor stator. In this way, a plurality of shafts can be slidably supported on the support portion on the linear motor stator side, so that the support structure of the linear motor mover on the support portion on the linear motor stator side is supported. The support structure for the mover can be formed at a low cost. Further, since a plurality of shafts are supported on the stator side, a sensor scale for position detection can be attached to the side surface of the magnet holder.

  It is preferable that the dimension in the magnetic pole face facing direction in which both the magnetic pole faces of the plurality of permanent magnets of the plurality of shafts face each other is larger than the dimension of the magnet holder. If it does in this way, a magnet holder can be reduced in weight to the maximum, and a plurality of shafts can be supported firmly to a support part of a stator for linear motors. In this case, a plurality of shafts can be attached to the magnet holder by a fitting structure. If it does in this way, a plurality of shafts can be easily attached to an existing magnet holder.

  Further, the magnet holder protrudes from both ends of the linear motor mover in the moving direction and extends in the moving direction, and the pair of block portions protrudes from both ends of the linear motor mover in the moving direction. A plurality of shafts each extending in the direction can also be attached. In this way, since the plurality of shafts are attached to the magnet holder via the pair of block portions, the plurality of shafts can be firmly attached to the magnet holder by strengthening the attachment of the pair of block portions to the magnet holder. Can be installed.

  In this case, the dimension of the magnetic pole face facing direction in which both the magnetic pole faces of the plurality of permanent magnets of the block portion are opposed is made larger than the aforementioned dimension of the magnet holder. Then, one block part of the pair of block parts and a plurality of shafts protruding from the one block part are integrally formed, and the other block part of the pair of block parts and the plurality of shafts protruding from the other block part Can be formed integrally. In this case, a pair of block portions may be attached to the magnet holder by a fitting structure. If it does in this way, a plurality of shafts can be easily and firmly attached to a magnet holder.

  A plurality of shafts projecting from the magnet holder, the pair of block portions, and the pair of block portions, respectively, having a dimension in the magnetic pole face facing direction in which both the magnetic pole faces of the plurality of permanent magnets of the block portion are opposed to each other. And can be molded integrally. If it does in this way, the number of parts can be reduced and the intensity | strength of the whole needle | mover can be made high.

  According to the present invention, since the magnet holder has the thermal expansion absorption gap, even if the magnet holder is heated and expands, the expansion will swell into the thermal expansion absorption gap. The force applied to the pair of rails from the magnet holder is suppressed by the presence of the thermal expansion absorbing gap. Therefore, the linear motor can perform an accurate reciprocating motion.

It is sectional drawing of the linear motor using the needle | mover for linear motors of the 1st Embodiment of this invention. It is the II-II sectional view taken on the line of FIG. It is a top view before the assembly of the needle | mover of the needle | mover for linear motors of 1st Embodiment. It is a side view before the assembly of the needle | mover of the needle | mover for linear motors of 1st Embodiment. FIG. 4 is a partially enlarged view after the assembly of the mover in FIG. 3 is completed. It is a top view before the assembly of the needle | mover for linear motors of the 2nd Embodiment of this invention. It is a perspective view of the state which removed the permanent magnet of the needle | mover for linear motors of the 3rd Embodiment of this invention. It is a perspective view in the state where a permanent magnet of a mover for linear motors of a 4th embodiment of the present invention was removed. It is a perspective view of the state which removed the permanent magnet of the needle | mover for linear motors of the 5th Embodiment of this invention.

  The best mode for carrying out the present invention will be described below with reference to the drawings. FIG. 1 is a cross-sectional view of a linear motor using the linear motor mover according to the first embodiment of the present invention, and FIG. 2 is a cross-sectional view taken along the line II-II in FIG. As shown in both drawings, this linear motor has a case 1, a linear motor stator 3, and a linear motor movable element 5. The case 1 includes a pair of end brackets 7 and 9 made of a nonmagnetic material (for example, aluminum). The end brackets 7 and 9 are fixed to both ends of a stator core 11 of the stator 3 described later. The stator 3 has a cylindrical stator core 11 and three excitation windings 13.

  As shown in FIGS. 1 to 4, the linear motor movable element 5 of this example includes a magnet holder 15, seven permanent magnets 17, and a pair of rails 19. 3 and 4 are a plan view and a side view before the movable element 5 is assembled. The magnet holder 15 has a plate shape, and includes a holder main body 21 and a pair of reinforcing portions 23 fixed to the holder main body 21. The holder main body 21 has a plate shape whose outline is close to a rectangular shape, has a specific gravity smaller than that of the pair of reinforcing portions 23 made of iron or the like, and has a linear expansion coefficient larger than the linear expansion coefficient of the pair of rails 19. It is made of an aluminum nonmagnetic material. The pair of reinforcing portions 23 has an elongated shape along the rails, and is fixed to both end portions in the orthogonal direction (width direction) orthogonal to the longitudinal direction of the holder body 21 by insert molding. The pair of reinforcing portions 23 are formed of iron or an iron alloy having higher rigidity than the holder main body 21. Each of the pair of reinforcing portions 23 has a recess 23a that opens toward the holder body 21 side. The cross-sectional shape of the pair of recesses 23a has a trapezoidal shape. The trapezoidal shape of the cross-sectional shape of the recess 23a is located on the corresponding rail side with the lower base having a size larger than that of the upper base. In this example, the holder main body 21 to which the pair of reinforcing portions 23 are fixed is formed by casting and hardening a nonmagnetic material of aluminum or synthetic resin into a mold using the pair of reinforcing portions 23 as inserts. Yes.

  The magnet holder 15 has a permanent magnet holding part 25 at the center part of the holder main body 21. The permanent magnet holding part 25 is composed of seven through holes 27 arranged in the longitudinal direction of the magnet holder 15. The through holes 27 extend in the longitudinal direction (direction in which the rail extends) of the magnet holder 15 and the width direction (direction orthogonal to the direction in which the rail extends and toward the pair of rails) perpendicular to the longitudinal direction, respectively, and in the thickness direction (longitudinal direction). In a direction perpendicular to both the width direction and the width direction). Seven permanent magnets 17 are respectively fitted and held in the seven through holes 27. The seven permanent magnets 17 are respectively fitted in the seven through holes 27 so that the polarities appearing on the outer surfaces of the two adjacent permanent magnets 17 are different. Thereby, the seven permanent magnets 17 are held by the magnet holder 15 so as to form a row.

  The magnet holder 15 has three recesses 29 for forming gaps in opposing portions of the pair of reinforcing portions 23 facing the pair of rails 19. These recesses 29 are opened in a direction from the magnet holder 15 toward the rail 19 and in a magnetic pole surface facing direction in which both magnetic pole surfaces of the permanent magnet 17 are opposed. In other words, the recess 29 is open toward one side in the direction (width direction) orthogonal to the pair of rails, and both the direction orthogonal to the pair of rails (width direction) and the direction in which the rails extend (longitudinal direction). Opening is made on both sides of the direction (thickness direction) perpendicular to each other. By forming three concave portions 29 in one reinforcing portion 23, four contact portions 21 a that are alternately arranged with the three concave portions 29 and contact with the rail 19 are formed. In this example, the three recesses 29 constitute a thermal expansion absorbing gap that absorbs the force applied to the pair of rails 19 from the magnet holder 15 by absorbing the thermal expansion of the magnet holder 15.

  The pair of rails 19 are made of stainless steel and have an elongated shape that is larger in length than the magnet holder 15. The pair of rails 19 are attached to the pair of reinforcing portions 23 of the magnet holder 15 in the central region in the longitudinal direction. Specifically, as shown by a broken line in the upper left of the magnet holder 15 in FIG. 3, a screw formed in the contact portion 21 a of the pair of reinforcing portions 23 through the through holes 19 a penetrating the pair of rails 19. The pair of rails 19 are respectively attached to the pair of reinforcing portions 23 of the magnet holder 15 by screws 31 screwed into the holes 23a. The pair of rails 19 have a pair of groove portions 19b extending in the longitudinal direction. The pair of groove portions 19b of the pair of rails 19 are slidably supported by support portions 7a and 9a provided on the end brackets 7 and 9, respectively (see FIGS. 1 and 2). As a result, the linear motor movable element reciprocates with respect to the stator 3.

  In the linear motor stator 3 of this example, as shown in FIG. 5, when the holder main body 21 and the pair of reinforcing portions 23 are heated by heat from the stator windings, The combined force of the force applied to the portion 23 and the force generated by the expansion of the pair of reinforcing portions 23 is applied to the pair of rails 19. When such combined forces act on the pair of rails 1 side, the inner wall portion of the recess 29 is likely to expand or bulge into the recess 29 (arrow F1), and the magnet holder 15 and the pair of rails 19 The expansion rate (the rate of deformation due to expansion) of the portion of the abutting portion that contacts is reduced (arrow F2). Therefore, the force applied from the magnet holder 15 to the pair of rails 19 can be reduced. In particular, in this example, the holder body 21 has a linear expansion coefficient larger than the linear expansion coefficient of the pair of rails 19, so that the force applied to the pair of reinforcement portions 23 is large and the pair of reinforcement portions 23 are also heated. Although it expands, most of the internal stress generated by these thermal expansions goes to the recess 29.

  Further, in this example, the thermal expansion absorbing gap (recess 29) is easy to form because it opens to the outside of the magnet holder 15. Moreover, in the linear motor stator 3 of this example, the weight of the magnet holder 1 as a whole can be reduced by reducing the weight of the holder body 21. Further, the pair of reinforcing portions 23 can suppress the bending of the magnet holder 15.

  An elastic body can be disposed between the magnet holder 15 and the pair of rail portions 19. When such an elastic body is disposed, the force applied to the pair of rails 19 from the magnet holder 15 due to thermal expansion can be absorbed by the elastic body, and thus the force applied to the pair of rails 19 can be further suppressed. .

  FIG. 6 is a plan view before assembly of the linear motor mover according to the second embodiment of the present invention. The linear motor movable element of this example has the same structure as the linear motor movable element of the first embodiment except for the thermal expansion absorbing gap. The thermal expansion absorption gap of the linear motor mover of this example is configured by a plurality of gap formation through holes 129 that penetrate the magnet holder 115. Eight through holes 129 are formed along the rails in a region between the permanent magnet holding portion 125 and the pair of reinforcing portions 123 (opposing portions facing the pair of rails 119). In this example, the through hole 129 is formed in a portion adjacent to the pair of reinforcing portions 123 of the holder main body 121 so as to penetrate the holder main body 121 in the thickness direction.

  FIG. 7 is a perspective view of the linear motor mover according to the third embodiment of the present invention with the permanent magnet removed. The mover for a linear motor in this example has a magnet holder 215 and four shafts 219. The magnet holder 215 has a rectangular plate shape and is made of aluminum. The magnet holder 215 has a permanent magnet holding part 225 at the center. The permanent magnet holding part 225 includes seven through holes 227 arranged in the longitudinal direction of the magnet holder 215. The through hole 227 has a rectangular shape extending in a direction orthogonal to the longitudinal direction of the magnet holder 215. Seven permanent magnets (not shown) are fitted and held in the seven through holes 227, respectively. The seven permanent magnets are respectively fitted in the seven through holes 227 so that the polarities appearing on the outer surfaces of the two adjacent permanent magnets are different. As a result, the seven permanent magnets are held by the magnet holder 215 so as to form a row. A sensor scale 216 for position detection is attached to the side surface of the magnet holder.

  The four shafts 219 are made of stainless steel and have a cylindrical shape. The shaft 219 has a diameter dimension larger than the dimension of the magnet holder 215 in the thickness direction (the direction in which both magnetic pole surfaces of the permanent magnet face each other). At one end of the shaft 219, a groove-like fitting recess 219a extending in the radial direction of the shaft is formed. Of the four shafts 219, the fitting recesses 219a of the two shafts 219 are fitted to one end of the magnet holder 215 in the moving direction of the linear motor mover, and the fitting recesses of the other two shafts 219 are fitted. 219a is fitted to the other end of the magnet holder 215 in the moving direction of the linear motor mover. Thereby, the four shafts 219 protrude from the both end portions of the magnet holder 215 in the moving direction of the linear motor mover, and extend in the moving direction of the linear motor mover. The four shafts 219 are slidably supported by the support portion of the linear motor stator. A screw 231 that passes through the through hole in the magnet holder 215 and is screwed into the screw hole in the shaft 219 is attached to the inner surface of the through hole 227 of the magnet holder 215. In this example, four shafts 219 are attached to the magnet holder 215 by the above-described fitting structure and the screw 231. According to the linear motor movable element of this example, the shaft 219 can be slidably supported on the support part on the linear motor stator side, so that the linear motor movable element is supported on the linear motor stator side. The support structure for the part can be simplified, and the support structure for the mover can be formed at low cost. Further, since the shaft 219 is supported on the stator side, a sensor scale 216 for position detection can be attached to the side surface of the magnet holder.

  FIG. 8 is a perspective view of the linear motor mover according to the fourth embodiment of the present invention with the permanent magnet removed. The linear motor movable element of this example includes a magnet holder 315, a pair of block portions 318, and four shafts 319. The magnet holder 315 is made of aluminum, and integrally includes a central portion 320 and a pair of fitting protrusions 322. The central part 320 basically has the same structure as the magnet holder 215 shown in FIG. The pair of fitting protrusions 322 are located at both ends of the central portion 320 in the moving direction of the linear motor mover. The pair of fitting protrusions 322 have a shape in which the dimension in the thickness direction of the magnet holder 315 (the direction in which both magnetic pole surfaces of the permanent magnet face each other) increases in the direction away from each other.

  The pair of block portions 318 and the four shafts 319 are made of stainless steel, and one block portion 318 of the pair of block portions and two shafts of the four shafts 319 are integrally formed, and the pair of block portions The other block 318 and another two of the four shafts 319 are integrally formed. The pair of block portions 318 have a substantially rectangular parallelepiped shape, and the dimension of the block portion in the thickness direction of the magnet holder 315 (the direction in which both magnetic pole surfaces of the permanent magnet face each other) is larger than that of the magnet holder 315. Yes. The pair of block portions 318 are respectively formed with groove-like fitting recesses 318a extending in the longitudinal direction. The two shafts 319 formed integrally with each of the pair of block portions 318 are respectively coupled to the surfaces of the pair of block portions 318 opposite to the surfaces where the fitting recesses 318a are formed. Then, the pair of fitting protrusions 322 of the magnet holder 315 and the fitting recesses 318 a of the pair of block portions 318 are respectively fitted, and the pair of block portions 318 and the four shafts 319 are attached to the magnet holder 315. ing. Accordingly, the pair of block portions 318 protrude from both end portions of the magnet holder 315 in the moving direction of the linear motor mover and extend in the moving direction of the linear motor mover. Further, the four shafts 319 protrude from the both ends of the pair of block portions 318 in the moving direction of the linear motor mover, and extend in the moving direction of the linear motor mover. A sensor scale 316 for position detection is attached to a portion extending between the side surface of the magnet holder 315 and the side surface of one block portion 318 of the pair of block portions. According to the linear motor movable element of this example, the shaft 319 is attached to the magnet holder 315 via the pair of block portions 318. Therefore, by firmly attaching the pair of block portions 318 to the magnet holder 315, The shaft 319 can be firmly attached to the magnet holder 315.

  FIG. 9 is a perspective view of the linear motor mover according to the fifth embodiment of the present invention with the permanent magnet removed. In the linear motor mover of this example, a magnet holder 415, a pair of block portions 418, and a shaft 419 projecting from each of the pair of block portions 418 are integrally formed by casting aluminum or the like. The basic structure is the same as that of the linear motor mover shown in FIG. If it does in this way, the number of parts can be reduced and the intensity | strength of the whole needle | mover can be made high.

  Hereinafter, embodiments of the invention described in the present specification will be listed.

(1) a plurality of permanent magnets;
A magnet holder formed such that a plurality of concave portions or through-hole permanent magnet holding portions into which the plurality of permanent magnets are respectively fitted are arranged in a row;
A pair of rails attached to the magnet holder along the row of the permanent magnet holding portions so that the row is located therebetween, and the pair of rails slides on the support portion of the linear motor stator Supported as possible,
The magnet holder is a linear motor mover formed of a material having a linear expansion coefficient larger than the linear expansion coefficient of the rail,
The magnet holder has heat that absorbs the thermal expansion of the magnet holder so as to suppress the stress generated in the magnet holder due to the thermal expansion of the magnet holder from being applied to the pair of rails from the magnet holder. A linear motor movable element characterized in that an expansion absorbing gap is formed.

(2) The thermal expansion absorbing gap is open toward one side in a direction orthogonal to the pair of rails and extends in a direction orthogonal to both the direction orthogonal to the pair of rails and the direction in which the rail extends. Consists of a plurality of gap forming recesses opening on both sides,
The plurality of gap forming recesses are formed at predetermined intervals along the rail,
The linear motor movable element according to (1), wherein a plurality of contact portions that contact the rail are formed on both sides of the gap forming recess.

  (3) The linear motor mover according to (2), wherein the rail is fixed to the plurality of contact portions by a fixing unit.

(4) The thermal expansion absorption gap portion includes a plurality of gap formation through-holes that open toward both sides in a direction orthogonal to the pair of rails and the direction in which the rails extend.
The linear motor movable element according to (1), wherein the plurality of gap forming through holes are formed at predetermined intervals along the rail.

(5) The magnet holder includes a holder main body having the permanent magnet holding portion, and a pair of reinforcing portions fixed to the holder main body and to which the pair of rails are respectively attached.
The holder body is formed of a nonmagnetic material having a specific gravity smaller than that of the pair of reinforcing portions,
The pair of reinforcing portions is the linear motor movable element according to (1), wherein the pair of reinforcing portions has higher rigidity than the holder main body.

(6) The holder body is made of aluminum or synthetic resin,
The pair of reinforcing portions is the mover for a linear motor according to the above (5), which is made of iron or an iron alloy.

  (7) The mover for a linear motor according to (1), wherein an elastic body is disposed between the magnet holder and the pair of rail portions.

(8) a plurality of permanent magnets;
A linear motor mover comprising: a magnet holder formed such that a plurality of concave portions or through-hole permanent magnet holding portions into which the plurality of permanent magnets are respectively fitted to form a row;
Two cylindrical shafts are provided at both ends in the moving direction of the magnet holder, extend in the moving direction, and are slidably supported by the support portion of the linear motor stator. A linear motor.

(9) The diameter dimension of the four shafts is larger than the dimension in the thickness direction perpendicular to the moving direction of the magnet holder,
Two shafts provided at the end of the magnet holder are provided at the end of the magnet holder in a state of being spaced apart in the width direction of the magnet holder perpendicular to the moving direction and the thickness direction. And
A fitting groove into which the end of the magnet holder is fitted is formed at the end of the shaft on the magnet holder side,
The mover for a linear motor according to (8), wherein the four shafts are provided on the magnet holder in a state in which the end of the magnet holder is fitted in the fitting groove.

(10) a plurality of permanent magnets;
A linear motor mover comprising: a magnet holder formed such that a plurality of concave portions or through-hole permanent magnet holding portions into which the plurality of permanent magnets are respectively fitted to form a row;
The magnet holder is provided at both ends in the moving direction of the linear motor mover and extends in the moving direction, and two each of the pair of block portions are provided in the moving direction. A mover for a linear motor to which four shafts extending respectively are attached.

DESCRIPTION OF SYMBOLS 15 Magnet holder 17 Permanent magnet 19 A pair of rail 21 Holder main body 21a Contact part 23 A pair of reinforcement part 25 Permanent magnet holding | maintenance part 29 Recessed part (space | gap part for thermal expansion absorption)
31 Screw

Claims (5)

A plurality of permanent magnets;
In the linear motor movable element having a magnet holder that holds the plurality of permanent magnets in a permanent magnet holding portion formed of a recess or a through hole so that the plurality of permanent magnets form a row,
A plurality of shafts that protrude from both end portions in the moving direction of the linear motor mover and extend in the moving direction of the linear motor mover are attached to the magnet holder,
A linear motor mover in which the plurality of shafts are slidably supported by a support portion of a linear motor stator. The dimension of the magnetic pole face facing direction in which both the magnetic pole faces of the plurality of permanent magnets of the plurality of shafts face each other is larger than the dimension of the magnet holder,
The mover for a linear motor according to claim 1, wherein the plurality of shafts are attached to the magnet holder by a fitting structure. A plurality of permanent magnets;
In the linear motor movable element having a magnet holder that holds the plurality of permanent magnets in a permanent magnet holding portion formed of a recess or a through hole so that the plurality of permanent magnets form a row,
The magnet holder includes a pair of block portions protruding from both end portions in the moving direction of the linear motor mover and extending in the moving direction, and both end portions of the pair of block portions in the moving direction of the linear motor mover. A plurality of shafts that protrude from the respective extending directions in the moving direction are attached,
A linear motor mover in which the plurality of shafts are slidably supported by a support portion of a linear motor stator. The dimension of the magnetic pole face facing direction in which both magnetic pole faces of each of the plurality of permanent magnets of the block portion are opposed is larger than the dimension of the magnet holder,
One block portion of the pair of block portions and a plurality of shafts protruding from the one block portion are integrally formed,
The other block portion of the pair of block portions and a plurality of shafts protruding from the other block portion are integrally formed,
The mover for a linear motor according to claim 3, wherein the pair of block portions are respectively attached to the magnet holder by a fitting structure. The dimension of the magnetic pole face facing direction in which both magnetic pole faces of each of the plurality of permanent magnets of the block portion are opposed is larger than the dimension of the magnet holder,
The mover for a linear motor according to claim 3, wherein the magnet holder, the pair of block portions, and the plurality of shafts protruding from the pair of block portions are integrally formed.

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