JP2008289324A - Linear motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a linear motor, in which it does not require much time to assemble and fix permanent magnets to magnet-holding frames and the firmly fixed state of the permanent magnets assembled to the magnet-holding frames can be maintained stably. <P>SOLUTION: The linear motor includes rails, on which many magnets are arrayed side by side in the traveling direction, and a moving element, which is arranged facing the rails so as to move relatively to the rails. In the magnet-holding frames constituting the rails, many magnet-holding holes, which hold the permanent magnets, are lined up. Furthermore, this linear motor has a pushing-in tool including screws and the like for pressing and fixing the permanent magnets into the magnet-holding frames via inserted members, which are sandwiched between the ends of the permanent magnets and the magnet-holding holes. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a linear motor having a rail in which a large number of permanent magnets are arranged side by side and in a running direction, and a mover that is arranged to face the rail so as to move relative to the rail. In particular, the present invention relates to fixing permanent magnets arranged in a linear motor.

  In recent years, linear motors have been used as moving means for moving linearly at high loads and high speeds. The linear motor includes a rail having a permanent magnet arrangement in which permanent magnets are arranged in a row, and a mover to which an electromagnet wound with a coil is attached. The rail of the permanent magnet arrangement is composed of a permanent magnet and a magnet holding frame.

  Conventionally, the permanent magnet is disclosed in, for example, Japanese Patent Application Laid-Open No. 2004-266914 (Patent Document 1), Japanese Patent Application Laid-Open No. 2004-194472 (Patent Document 2), and Japanese Patent Application Laid-Open No. 2005-20892 (Patent Document 3). It was fixed with an adhesive.

  The fixing of the permanent magnet with the adhesive does not have assembling accuracy because it is difficult to attach and attach the permanent magnet. Therefore, as shown in Patent Document 3, a structure in which a part to which a permanent magnet is attached is fixed by performing a projection process that sandwiches the permanent magnet.

  However, in the structure in which the permanent magnets are arranged in a row on the magnet holding frame, fixing with an adhesive is very inefficient.

  This takes time to apply the adhesive to the permanent magnet and the magnet holding hole of the magnet holding frame. After the permanent magnet is fitted, the operation of wiping off the protruding adhesive is accompanied. There is a problem that it takes time and effort to cure the adhesive.

  Further, there is a problem that the inserted permanent magnet is lifted from the magnet holding frame due to the attractive force due to the strong magnetic force. For this reason, it is necessary to apply a single-sided adhesive tape or the like on the upper surface of the permanent magnet so as not to float. This application process is necessary for all permanent magnets during assembly.

  Therefore, when it is mass-produced, it takes work time and directly increases the cost. In addition, after curing, depending on the usage environment of the linear motor, there was a mechanical problem such as damage due to peeling of the permanent magnet due to deterioration of the adhesive.

JP 2004-266914 A JP 2004-194472 A JP 2005-20892 A

  In view of the above problems, the present invention provides a linear motor that does not require time and effort for fixing a permanent magnet into a magnet holding frame, and that the permanent magnet built into the magnet holding frame is stably maintained securely. The purpose is to provide.

  The present invention has a rail in which a large number of magnets are arranged side by side and in a traveling direction, and a magnet holding frame provided on the rail. In a linear motor in which a large number of magnet holding holes for holding a permanent magnet are arranged, a screw for pressing and fixing the permanent magnet to the magnet holding frame via an interposed member sandwiched between the end of the permanent magnet and the magnet holding hole It has the pushing tool containing etc., It is characterized by the above-mentioned.

  In addition, the present invention includes a rail in which a large number of permanent magnets are arranged side by side and a moving element that is arranged to face each other so as to move relative to the rail. The magnet holding frame has a frame edge holding plate that holds both end sides of the magnet holding frame along the traveling direction from both the upper and lower sides in a linear motor in which a large number of magnet holding holes for holding permanent magnets are arranged. The frame edge portion sandwiching plate covers both end sides of the magnet holding hole and sandwiches both end sides of the permanent magnet from the upper and lower surfaces.

  According to the present invention, the permanent magnet fitted to the magnet holding frame is pressed and fixed by the pushing tool through the interposition member, so that the work of fixing the permanent magnet does not require time and effort, and the permanent magnet built into the magnet holding frame is fixed. The secure fixing of the magnet is stably maintained.

  Further, according to the present invention, there is a frame edge clamping plate that sandwiches both end sides of the magnet holding frame along the traveling direction from both upper and lower surfaces, and the upper and lower frame edge clamping plates are located at both end sides of the magnet holding hole. Since both ends of the permanent magnet are covered and sandwiched between the upper and lower surfaces, the work of fixing the permanent magnet does not take time and the permanent magnet built into the permanent magnet holding frame is stably maintained.

  DETAILED DESCRIPTION OF THE INVENTION Reference will now be made in detail to the drawings illustrating the best mode for carrying out the invention.

  FIG. 1 is a diagram generally showing a linear motor having a rail in which a large number of permanent magnets are arranged side by side and a mover arranged to face each other so as to move relative to the rail. It is.

  The linear motor shown in FIG. 1 is an actuator that is propelled by an alternating magnetic field composed of a permanent magnet and an electromagnet. Propulsive force is obtained by using the attractive force and repulsive force of the permanent magnet and the electromagnet, and it moves straight.

  As shown in FIG. 1, the linear motor includes a permanent magnet array rail 102 in which permanent magnets 101 are alternately arranged in N and S poles, and a mover 104 to which an electromagnet 103 is attached.

  The long rail 102 includes a long unit by adding a unit length of rail, and a long unit as a single unit. Here, an example in which a rail having a unit length is added will be described.

  A feature of the present invention relates to a fixing structure for permanent magnets arranged on the rail 102.

  The magnet holding frame and the permanent magnet constituting the rail will be described with reference to FIGS. 1, 2, and 3.

  The rail 102 includes a magnet holding frame 301 having a unit length, a permanent magnet 101, a set piece 303 as an interposed member, and a frame edge portion clamping plate 403.402.

  The magnet holding frame 301 is made of a stainless steel material that is a non-magnetic material, and has a large number of magnet holding holes 302. The magnet holding holes 302 are arranged side by side in the rail running direction (longitudinal direction).

  The permanent magnet 101 and the set piece 303 of the interposed member are inserted into the magnet holding hole 302 provided in the magnet holding frame 301. The set piece 303 is inserted in contact with the longitudinal end surface of the permanent magnet 101.

  In this state, a pushing tool 305 such as a screw is inserted from a screw hole 304 that penetrates to the magnet holding hole 302 provided on the side surface of the magnet holding frame 301. The permanent magnet 101 is clamped from both ends by the set piece 303 by pressing the set piece 303 of the interposed member with the pusher 305 and fixed to the magnet holding frame 301.

  Thus, the magnet rail 102 in which the permanent magnets 101 are arranged and fixed on the magnet holding frame 301 is formed.

  The magnet holding frame 301 is made of a nonmagnetic material. This uses a metal material in order to suppress deformation of the plurality of magnet holding holes 302 and ensure the strength of the parts. At the same time, stainless steel was used to improve the magnetic performance of the linear motor.

  The set piece 303, which is an interposed member, is made of a nonmagnetic material including bronze. A brass material may be used.

  The set piece 303 uses a metal material having a lower Young's modulus than these materials in order to improve the close contact with the permanent magnet 101 and the pushing tool 305.

  Further, since the set piece 303 is as large as the end face of the permanent magnet 101, a metal material having good workability is used. A brass material is suitable here.

  The pushing tool 305 is made of a non-magnetic material. A metal material is used to secure the strength because the pushing force is applied. Stainless steel is suitable here.

  If the tip of the pushing tool 305 is directly brought into contact with the permanent magnet 101, the permanent magnet 101 may be damaged or broken due to stress concentration. Therefore, the set piece 303 is interposed so that the end face of the permanent magnet 101 is entirely contacted and pressed, so that the stress is dispersed.

  Since the pressing force of the pushing tool 305 is dispersed over the entire end face of the permanent magnet 101, the permanent magnet 101 formed of a rare earth sintered body is unlikely to break. Thereby, since the permanent magnet 101 can be strongly clamped and fixed by the pushing tool 305, it can be fixed securely.

  Moreover, since the permanent magnet 101 is not damaged, stable fixation is maintained. Since no adhesive is used, there is no need for trouble in fixing the permanent magnet.

  Next, the integration of the magnet holding frame and the prevention of the permanent magnet from being raised will be described with reference to FIGS.

  A unit-length rail 401 in which the permanent magnet 101 is fitted to the magnet holding frame 301 is added to form a long rail. This long rail is a rigid rail integrated by fastening with the frame edge pinching plates 402.403 and the fixing bolt 404.

  End substrates 500 are provided at both ends of the long rail. The end substrate 500 holds both ends of the extended rail. The end substrate 500 is also integrated with the magnet holding frame 301 by fastening the frame edge holding plate 402.403.

  The frame edge portion clamping plates 402 and 403 that sandwich the both end sides of the magnet holding frame 301 along the traveling direction from the upper and lower surfaces are placed so as to straddle at least two magnet holding frames 301. Further, the frame edge sandwiching plate 402.403 is also placed so as to straddle the end substrate 500 and the magnet holding frame 301.

  The magnet holding frame 301 and the end substrate 500 integrated via the frame edge clamping plates 402 and 403 are fastened by the fixing bolts 404 so as to sandwich the both end sides from both the upper and lower surfaces, so that they are firmly coupled.

  The rail can correspond to an arbitrary length by adding a rail 401 having a unit length.

  As shown in FIG. 2, the frame edge portion clamping plates 402 and 403 are placed so as to cover both end sides of the magnet holding hole 302.

  As a result, the end side of the permanent magnet 101 is sandwiched from the upper and lower surface sides by the frame edge portion clamping plates 402.403, so that the permanent magnet 101 does not rise from the magnet holding hole 302.

  Since the permanent magnet 101 fitted in the magnet holding hole 302 of the magnet holding frame 301 is sandwiched from the upper and lower surfaces by the frame edge pinching plates 402.403, the permanent magnet 101 is securely fixed without being lifted from the magnet holding hole 302. Is done.

  Further, since a local pressing force is applied to the end portion of the permanent magnet 101, the permanent magnet 101 is not damaged and is stably fixed.

  Furthermore, since no adhesive is used, it does not take time to perform a fixing operation for incorporating a permanent magnet.

  The frame edge holding plate 402.403 is made of a non-magnetic material. This uses a metal material to connect a plurality of unit length rails 401 arranged in series and to secure the rigidity of the unit length rail 401. Stainless steel is suitable here.

  The fastening with the fixing bolt will be described in more detail with reference to FIG.

  As for frame edge part clamping board 402.403, the joint surface with the magnet holding | maintenance frame 301 is processed with the plane precision.

  The frame edge holding plate 403 and the magnet holding frame 301 are provided with through holes 407 through which the fixing bolts 404 are passed, and the frame edge holding plate 402 is provided with screw holes into which the fixing bolts 404 are screwed.

  Further, a counterbore hole 410 is provided in the through hole of the frame edge holding plate 403 on the surface side of the frame edge holding plate 403. The counterbore 410 has a depth that allows the head 415 of the fixing bolt 404 to be loosely fitted, and that the upper surface of the head 415 falls more than the surface of the frame edge pinching plate 403.

  For this reason, the fixing bolt 404 to which the frame edge holding plate 403.402 is fastened is in a state in which the head 415 is completely dropped into the counterbore 410.

  In this way, the head of the fixing bolt 404 does not protrude above the frame edge pinching plate 403, so that the traveling gap between the rail 102 and the movable element 104 that travels can be narrowed. This improves the performance of the linear motor.

  The thickness of the permanent magnet 101, the thickness of the magnet holding frame 301, and the thickness (length in the vertical direction) of the set piece 303 are manufactured with the same dimensions. The assembled unit-length rail 401 does not protrude partly from the upper and lower surfaces of the permanent magnet 101 and the set piece 303 from the upper and lower surfaces of the magnet holding frame 301, and is flush with the same plane.

  For this reason, fastening by the frame edge part pinching plate 403.402 of the rail 401 to be added is free from deformation such as bending, undulation, and twisting, and a long extension rail with high linear accuracy can be provided.

  Note that the thickness of the permanent magnet 101 and the set piece 303 may be somewhat smaller than the thickness of the magnet holding frame 301 and may be lowered into the magnet holding hole 302.

  In the assembly fastening structure described above, since no adhesive is used, there is no curing time, troublesome application of the adhesive, and damage due to deterioration of the adhesive can be eliminated.

  Next, another embodiment shown in FIG. 5 will be described.

  This embodiment is characterized in that the frame edge holding plate 402 of the embodiment shown in FIG. 4 is changed to a frame fixing holding plate 501.

  The frame fixing and clamping plate 501 is made of a nonmagnetic material. This is because a plurality of unit-length rails 401 arranged in a row are connected in series, and the rails 401 are arranged without a step, so that the workability of the plane is good, and the frame fixing clamping plate 501 ensures the rigidity of the rails 401. Aluminum material is suitable.

  In addition, since the permanent magnet 101 is pressed by the frame fixing sandwiching plate 501 over the entire lower surface side, the permanent magnet 101 can be fixed more reliably.

  Next, the installation and fixing of the rail will be described with reference to FIG.

  The extended long rail is fixed to the installation location using the installation fixing plate 600. The long rail is installed and fixed by pressing the fixing plate 600 from above the end substrate 500 and stopping the fixing plate 600 with a plurality of installation fixing bolts 610.

  As described above, the head of the fixing bolt 404 that fastens the end substrate 500 together with the magnet holding frame 301 falls into the counterbore hole 410 provided in the frame edge 403. For this reason, the installation fixing plate 600 does not rest on the head of the fixing bolt 404, and the installation fixing plate 600 is satisfactorily provided, so that stable clamping and fixing are provided.

According to an embodiment of the present invention, there is provided a linear motor having a rail in which a large number of permanent magnets are arranged side by side and a mover disposed so as to face each other so as to move relative to the rail. It is a front view. 1 is a cross-sectional view of a rail in which permanent magnets are arranged according to an embodiment of the present invention. It is a perspective view which shows the state which concerns on the Example of this invention and incorporates a permanent magnet in a magnet holding frame. FIG. 6 is a perspective view showing a state in which a unit-length rail is added according to an embodiment of the present invention. FIG. 5 is a perspective view corresponding to FIG. 4 according to another embodiment of the present invention. It is a figure which concerns on the other Example of this invention, and shows the place which fixed the edge part board | substrate to the installation location. FIG. 11 is a cross-sectional view of a magnet holding frame and a frame edge holding plate fastened with fixing bolts 404 according to another embodiment of the present invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 101 ... Permanent magnet, 102 ... Rail, 301 ... Magnet holding frame, 302 ... Magnet holding hole, 303 ... Set piece which is an interposed member, 305 ... Pushing tools, such as a screw.

Claims (13)

A rail in which a large number of permanent magnets are arranged side by side and a traveling direction, and a mover that is disposed so as to be opposed to move relative to the rail,
In the linear motor in which a large number of magnet holding holes for holding the permanent magnet are arranged in the magnet holding frame constituting the rail,
A linear motor comprising a pushing tool including a screw or the like for fixing the permanent magnet to the magnet holding frame via an interposed member sandwiched between an end of the permanent magnet and the magnet holding hole. The linear motor according to claim 1,
The interposition member is provided at both ends of the permanent magnet and is formed of a nonmagnetic metal including bronze. The linear motor according to claim 1,
The pushing tool is a pushing screw, and a screw hole into which the pushing screw is screwed is passed through the magnet holding hole from the outside of the magnet holding frame,
The linear motor characterized in that the screw hole penetrates toward the center of the interposition member. The linear motor according to claim 1,
The linear motor, wherein the interposition member is a metal material having a Young's modulus lower than that of the permanent magnet. A rail in which a large number of permanent magnets are arranged side by side and a traveling direction, and a mover that is disposed so as to be opposed to move relative to the rail,
In the linear motor in which a large number of magnet holding holes for holding the permanent magnet are arranged in the magnet holding frame constituting the rail,
A frame edge sandwiching plate that sandwiches both end sides of the magnet holding frame along the traveling direction from the upper and lower surfaces;
The linear motor according to claim 1, wherein the upper and lower frame edge clamping plates cover both end sides of the magnet holding hole and sandwich both end sides of the permanent magnet from the upper and lower surfaces. The linear motor according to claim 5,
A linear motor comprising fixing bolts for fastening the frame edge holding plates on both upper and lower surfaces and the magnet holding frame together. The linear motor according to claim 6,
The fixing bolt has a head;
The linear motor according to claim 1, wherein the frame edge clamping plates on both upper and lower sides have a counterbore hole in which at least one of the heads falls below the surface of the frame edge clamping plate. The linear motor according to claim 5,
A linear motor characterized in that a large number of the magnet holding frames that are connected and extended are integrated by being clamped by the frame edge clamping plates. A rail in which a large number of permanent magnets are arranged side by side and a traveling direction, and a mover that is disposed so as to be opposed to move relative to the rail,
In the linear motor in which a large number of magnet holding holes for holding the permanent magnet are arranged in the magnet holding frame constituting the rail,
A frame edge clamping plate that clamps both upper surface sides of the magnet holding frame along the running direction and the entire lower surface side of the magnet holding frame, and a frame fixing clamping plate;
The frame edge holding plate covers the end side of the magnet holding hole and holds down the upper surface end side of the permanent magnet, and the frame fixing holding plate covers the entire lower surface of the magnet holding frame and covers the lower surface side of the permanent magnet. A linear motor characterized by holding down the whole. The linear motor according to claim 5 or 9,
The linear motor according to claim 1, wherein the upper and lower surfaces of the permanent magnet are flush with both surfaces of the magnet holding frame, or the permanent magnet side is somewhat lower than the magnet holding frame. The linear motor according to claim 9, wherein
A linear motor comprising a fixing bolt for fastening together the frame edge holding plate, the magnet holding frame, and the frame fixing holding plate. The linear motor according to claim 11,
The fixing bolt has a head,
A linear motor having a countersink hole in which a head part falls below a surface of a frame edge holding plate or a frame fixing holding plate in at least one of the frame edge holding plate and the frame fixing holding plate. The linear motor according to claim 5,
A linear motor characterized in that a large number of the magnet holding frames that are connected and extended are integrated by being clamped by the frame edge clamping plates.

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