JP6001828B2 - Linear motor stator - Google Patents

Description

  The present invention relates to a stator for a linear motor used in industrial machines such as machine tools.

  Conventionally, in an industrial machine such as a machine tool, a linear motor has been used as a means for realizing high speed and high accuracy. Patent Document 1 discloses a linear motor that achieves cost reduction by disposing an expensive permanent magnet on the mover side, particularly in a long stroke machine, thereby reducing the amount of permanent magnet used.

  With reference to FIG.3 and FIG.4, the linear motor of the patent document 1 mentioned above is demonstrated. FIG. 3 is a diagram illustrating a linear motor according to the related art. Fig.3 (a) is a figure which shows schematic structure of the linear motor based on a prior art. FIG. 3B and FIG. 3C are diagrams showing a permanent magnet provided on the mover side. FIG. 4 is a connection diagram of windings wound around the linear motor.

  As shown in FIG. 3A, the linear motor is movable in the direction in which the stators 52a and 52b extend between the two stators 52a and 52b extending in parallel and the two stators 52a and 52b. The mover 51 is provided.

  The stators 52a and 52b are formed by laminating a plurality of electromagnetic steel plates, and salient poles 50 are formed at intervals of a pitch P. The stators 52a and 52b are fixed to a bed (not shown) of a machine tool, for example. The stators 52a and 52b are arranged so as to be shifted from each other in the illustrated X-axis direction by a P / 2 pitch corresponding to an electrical angle of 180 degrees. A stator magnetic yoke 61 is also provided.

  The movable element 51 is provided, for example, between a bed of a machine tool and a table (not shown), and is supported so as to be movable in the X-axis direction by a guide or the like fixed to the table. The mover 51 includes mover blocks 53, 54, and 55 formed by laminating a plurality of electromagnetic steel plates. The mover block 53 is a U-phase mover block, the mover block 54 is a W-phase mover block, and the mover block 55 is a V-phase mover block. Each of the mover blocks 53, 54, and 55 is 120 degrees relative to the X-axis direction as the moving direction of the mover 51, that is, P corresponding to 120 degrees in terms of the electrical angle of the magnetic pole pitch P of the stators 52a and 52b. It is shifted by / 3. Three-phase AC windings are wound around the mover blocks 53, 54, and 55, respectively. That is, a U-phase three-phase AC winding 56 is wound around the mover block 53, a W-phase three-phase AC winding 57 is wound around the mover block 54, and a V-phase is wound around the mover block 55. The three-phase AC winding 58 is wound. The U, W, and V phases of the three-phase AC windings 56, 57, and 58 are star-connected as shown in FIG.

  On the surfaces of the mover blocks 53, 54, 55, permanent magnets 59, 64 are alternately arranged in the order of N, S, N,. Specifically, as shown in FIGS. 3B and 3C, three pairs of permanent magnets with N and S as one set are arranged at a pitch P. Here, as shown in FIG. 3, when the stator 52a side is SIDE-A and the stator 52b side is SIDE-B, the SIDE-A side permanent magnet 59 and the SIDE-B side permanent magnet 64 are: The polarity viewed from the SIDE-A side and the polarity viewed from the SIDE-B side are the same.

  When a current is supplied to the three-phase AC windings 56, 57, and 58 in the U → V and W directions, the magnetic flux 62 is excited in the linear motor.

  Next, the operation of the linear motor will be described. When a current is supplied to the three-phase AC windings 56, 57, 58, the mover blocks 53, 54, 55 are excited in the plus or minus direction in the Y-axis direction. Of the permanent magnets 59 and 64, the magnetic flux of the permanent magnet arranged in the same magnetic direction as the excitation direction of the AC winding is strengthened, and the magnetic flux of the permanent magnet arranged in the magnetic direction opposite to the excitation direction is weakened. . Therefore, the permanent magnet 59 and the permanent magnet 64 are excited by either one of the N or S poles having opposite polarities. And the magnetic flux 62 which passed each mover block 53,54,55 and stator 52a, 52b side forms the magnetic path shown to Fig.3 (a). At this time, a magnetic attractive force corresponding to the position of the mover 51 and the stators 52a and 52b is generated, so that a thrust is generated in the mover 51 and the mover 51 moves in the X-axis direction.

  The flow of magnetic flux will be described in more detail. Current flows in the U → V, W phase, that is, the three-phase AC winding 56 in the winding direction shown in FIG. 3A, and the three-phase AC windings 57 and 58 have the winding shown in FIG. When a current is passed in the opposite direction, the mover block 53 becomes the S pole on the SIDE-A side and the N pole on the SIDE-B side, and the mover blocks 54 and 55 on the contrary become the N pole on the SIDE-A side. The SIDE-B side is the S pole. Therefore, as indicated by the magnetic flux 62, a magnetic path is formed which flows from the mover block 53 to the mover blocks 54 and 55 via the stator 52b and then returns to the mover block 53 again through the stator 52a. Then, a magnetic attractive force acts in the same direction in the X-axis direction on the SIDE-A side and the SIDE-B side of the mover 51 to generate a thrust.

  The feature of the linear motor shown in FIG. 3 is that the expensive permanent magnets 59 and 64 are arranged on the movable element 51 side, so that the use amount of the permanent magnets 59 and 64 can be reduced particularly in the case of a long stroke. The cost reduction of the linear motor can be realized. In addition, the linear motor shown in FIG. 3 has a structure in which the mover block is excited by the same winding, so that the winding length is shortened, and a loss due to an electric resistance in which a current flows in the winding, a so-called copper loss. It also has the feature that it becomes smaller and the efficiency becomes higher. In addition, about the connection method of the three-phase alternating current windings 56, 57, and 58, you may employ | adopt (DELTA) connection instead of the star connection shown in FIG.

  The linear motor shown in FIG. 3 is based on the principle of forming a magnetic path in the stators 52 a and 52 b by supplying current to the three-phase AC windings 56, 57 and 58 wound around the mover 51. And an air gap existing between the stators 52a and 52b becomes a magnetic resistance that prevents the formation of a magnetic path. That is, if the air gap is wide, the magnetic resistance increases and the thrust decreases. For this reason, it is desirable to make the air gap as narrow as possible. The degree to which the air gap can be narrowed depends on the component accuracy. The component accuracy that affects the air gap includes the width of the mover 51, the widths of the stators 52a and 52b, the widths of the permanent magnets 59 and 64, and the width dimension of the bed-side fixing portion to which the stators 52a and 52b are attached. Even if each is manufactured with an accuracy of ± 0.05 mm, an error of (the above-mentioned 8 locations) × (0.05 mm) ÷ (two air gap portions) = 0.2 mm is obtained. Furthermore, the perpendicularity between the mover 51 and the stators 52a and 52b must be taken into account. When the perpendicularity is 0.05 mm, the sum of perpendicularity of the movable element 51 facing the air gap and the two surfaces of the stator (the respective faces of the stators 52 a and 52 b facing the movable element 51) is 0.05 mm. X2 surface = 0.1 mm Therefore, the total error of the air gap is 0.3 mm. An amount obtained by adding a margin so that the mover 51 and the stators 52a and 52b do not come into contact with the error of the air gap becomes a set value of the air gap, which is practically set to about 0.5 mm. However, it is difficult to manufacture the stators 52a and 52b with the perpendicularity of 0.05 mm or less.

  With reference to FIG. 5, the stator of the linear motor which concerns on a prior art is demonstrated. FIG. 5 is a perspective view showing a stator of a linear motor according to the prior art. The stator 52 a (52 b) has a bottom surface 10, a facing surface 11 that faces the mover 51, and an end surface 12. The stator 52 a (52 b) is configured by laminating a plurality of electromagnetic steel plates as indicated by the end surface 12. The salient poles 50 are formed at intervals of the pitch P on the facing surface 11 of the stator 52a (52b). Here, the surface of the tip of the salient pole 50 is flat, and the surface of the tip of the salient pole 50 forms the facing surface 11. The perpendicularity obtained by the stator 52a is the perpendicularity between the bottom surface 10 and the opposing surface 11 (the surface at the tip of the salient pole 50). As shown in FIG. 5, there is no problem if the stator 52a is assembled by simply laminating a plurality of electromagnetic steel plates so that the squareness becomes 0.05 mm. However, in general, electromagnetic steel sheets have a thickness error of several μm in the width direction. Therefore, when a plurality of electromagnetic steel sheets are stacked, the facing surface 11 is inclined with respect to the bottom surface 10, and the bottom surface 10 and the facing surface 11 are perpendicular to each other. It is difficult to stack a plurality of electrical steel sheets.

  Patent Document 2 discloses a technique for improving the perpendicularity. In the invention described in Patent Document 2, the perpendicularity is improved by fixing a plurality of laminated electromagnetic steel plates to an L-shaped support and then performing additional processing. With reference to FIG. 6, the L-shaped support stand described in Patent Document 2 will be described. FIG. 6 is a plan view showing a stator of a linear motor according to the prior art. As shown in FIG. 6, the electromagnetic steel sheet is pressed against the surface plate so that only the facing surface 11 becomes a flat surface and is bonded and laminated, and then fixed to the L-shaped support base 20 with bolts 15. Next, with the opposing surface 11 as a reference, the bottom surface 17 of the L-shaped support base 20 is processed to ensure a necessary squareness. The stator 52a and the L-shaped support base 20 are fixed to a bed or the like by the bolts 16 of the L-shaped support base 20.

JP 2006-109653 A JP 2003-045392 A

  However, the linear motor stator described in Patent Document 2 has the following problems. That is, since the L-shaped support base 20 is used as described above, the dimension of the stator is increased by the width of the member 18 against which the opposing surface 11 is pressed in the L-type support base 20, and the size of the linear motor is increased. Become. Further, since the L-shaped support base 20 is used, the cost of the linear motor increases.

  The objective of this invention is providing the stator of the linear motor which can reduce in size and cost while ensuring a squareness.

In order to solve the above problems, the present invention provides a plurality of laminated electromagnetic steel sheets, a plurality of electromagnetic steel sheets having a plurality of tube insertion holes penetrating in the laminating direction, and the plurality of electromagnetic steel sheets. A plurality of salient poles that protrude from the steel plate and are arranged at predetermined intervals along the longitudinal direction of the plurality of electromagnetic steel plates, and a plurality of fittings that are fitted into the plurality of tube insertion holes through the plurality of electromagnetic steel plates. And the plurality of tubes are fitted into the plurality of tube insertion holes with an adhesive or the like, thereby fixing the plurality of electromagnetic steel plates, and the plurality of tube insertion holes are formed by the plurality of tube insertion holes. An end face of the tube, which is formed side by side in the longitudinal direction of the electromagnetic steel sheet and corresponds to a surface that contacts the member to which the stator is fixed and the stator, protrudes from the surface of the electromagnetic steel sheet and is exposed. The stator of the linear motor.

Further, the present invention is a plurality of laminated electromagnetic steel sheets, a plurality of electromagnetic steel sheets having a plurality of tube insertion holes penetrating in the laminating direction, and a plurality of electromagnetic steel sheets protruding from the plurality of electromagnetic steel sheets. A plurality of salient poles arranged at predetermined intervals along the longitudinal direction of the steel sheet, and a plurality of pipes that penetrate the plurality of electromagnetic steel sheets and are fitted into the plurality of pipe insertion holes, By fitting the plurality of tubes into the plurality of tube insertion holes, the plurality of electromagnetic steel plates are fixed, and the plurality of tube insertion holes are formed side by side in the longitudinal direction of the plurality of electromagnetic steel plates, The plurality of electromagnetic steel plates and the tube are integrated with resin, and both surfaces perpendicular to the penetration direction of the tube insertion hole of the electromagnetic steel plate are covered with resin, and a member to which a stator is fixed and the fixing end face of the tube which corresponds to the surface on which the child is in contact is, the electrical steel Are exposed to both end surfaces of the resin covering the it is the stator of a linear motor according to claim.

  Further, in the linear motor stator according to the present invention, the tube insertion hole is formed so as to be fitted to the tube in a direction in which the salient pole extends, and the longitudinal direction of the plurality of electromagnetic steel plates Is formed with a gap wider than the tube, and the gap is filled with resin.

  In the linear motor stator according to the present invention, the tube insertion hole is formed at a position avoiding the salient poles in a longitudinal direction of the plurality of electromagnetic steel plates.

  Further, in the linear motor stator according to the present invention, the tube insertion holes are formed to be distributed at a distance from each other in a direction in which the salient poles extend.

  According to the present invention, the pipe is fitted so as to penetrate through a plurality of laminated electromagnetic steel sheets. In addition, by processing the end face of the tube exposed on the surface of the electromagnetic steel sheet and the surface of the tip of the salient pole, it is possible to ensure a squareness between the end face of the tube and the surface of the tip of the salient pole It has become. Thus, according to the present invention, it is possible to secure a squareness by fixing a plurality of electromagnetic steel plates with a pipe without using an L-shaped support base. Since the L-shaped support is not required, the linear motor can be downsized and the cost of the linear motor can be reduced.

It is a figure which shows the stator of the linear motor which concerns on 1st Embodiment of this invention. It is a figure which shows the stator of the linear motor which concerns on 2nd Embodiment of this invention. It is a figure which shows the linear motor which concerns on a prior art. It is a connection diagram of the winding wound around the linear motor. It is a perspective view which shows the stator of the linear motor which concerns on a prior art. It is a top view which shows the stator of the linear motor which concerns on a prior art.

  With reference to FIG. 1, the stator of the linear motor which concerns on 1st Embodiment of this invention is demonstrated. FIG. 1 is a diagram illustrating a stator of a linear motor according to a first embodiment of the present invention. Fig.1 (a) is the top view which looked at the stator from the minus Z direction which is the lamination direction of an electromagnetic steel plate, and is the figure seen from the same direction as Fig.3 (a). FIG. 1B is a view of the stator as viewed from the Y-axis direction, which is the direction in which the stator salient poles 50 extend. Note that the X-axis direction, the Y-axis direction, and the Z-axis direction are directions orthogonal to each other and constitute a three-dimensional orthogonal coordinate system.

  The stator of the linear motor according to the first embodiment is formed by stacking a plurality of electromagnetic steel plates 1 in the stacking direction (Z-axis direction). The stator has a predetermined interval along the direction (longitudinal direction) in which the stator (magnetic steel sheet 1) extends from the plurality of laminated magnetic steel sheets 1 in the short direction of the stator (magnetic steel sheet 1). The salient poles 50 are formed at intervals of the pitch P. The short direction of the stator corresponds to the Y-axis direction, and the long direction of the stator corresponds to the X-axis direction. The tip surface 5 of the salient pole 50 is a flat surface, and the tip surface 5 is disposed so as to face a movable element (not shown) (for example, the movable element 51 shown in FIG. 3A). That is, the face 5 at the tip of the salient pole 50 forms a facing surface that faces the mover.

  A plurality of pipe insertion holes 22 extending in the stacking direction and penetrating through the electromagnetic steel sheet 1 are formed in the laminated electromagnetic steel sheets 1. The plurality of tube insertion holes 22 are formed side by side in the direction (longitudinal direction) in which the stator (magnetic steel sheet 1) extends. In each of the tube insertion holes 22, a tube 23 is fitted so as to penetrate the electromagnetic steel sheet 1 and slightly protrude from both surfaces of the electromagnetic steel sheet 1. That is, the tube 23 is fitted into the tube insertion hole 22 so that both end surfaces 26 and 27 of the tube 23 slightly protrude from both surfaces of the electromagnetic steel sheet 1. The tube insertion hole 22 is formed in the X-axis direction, which is the direction (longitudinal direction) in which the stator (the electromagnetic steel sheet 1) extends so that the formation of the magnetic path by the mover 51 shown in FIG. , Formed so as to avoid the salient pole 50. The tube insertion holes 22 are formed at a distance L from each other in the Y-axis direction, which is the direction in which the salient poles 50 extend. The tube 23 is fitted into the tube insertion hole 22 with an adhesive or the like. Since the tube 23 is fitted in the tube insertion hole 22, the plurality of electromagnetic steel plates 1 are fixed. The reason why the both end faces 26 and 27 of the tube 23 slightly protrude from the electromagnetic steel sheet is that if the tube 23 is protruded long, the sameness of the protruded tube 23 is lowered, and it is bent by the magnetic attractive force acting on the stator. This is because the air gap between the mover and the stator changes. Therefore, it is desirable to determine the protruding amount of the tube 23 based on the magnitude of the magnetic attractive force and the allowable change amount of the air gap. In general, the amount of deflection of the tube 23 when a force is applied to the tip of the protruding tube from the X or Y direction is proportional to the cube of the protruding amount.

  After fixing the tube 23 to the tube insertion hole 22, the surface 5 of the tip of the salient pole 50 that faces a not-shown mover (for example, the mover 51 shown in FIG. 3A) and both ends of the tube 23 in the Z-axis direction The surfaces 26 and 27 are processed. Alternatively, a plurality of electromagnetic steel sheets 1 are laminated so that the tip surface 5 of the salient pole 50 is a flat surface, and then both end surfaces 26 and 27 in the Z-axis direction of the tube 23 are processed using the tip surface 5 as a reference. To do. By this processing, a required squareness is ensured between the end surfaces 26 and 27 (the bottom surface of the stator) of the tube 23 and the surface 5 (opposing surface) of the tip of the salient pole 50.

  Both end faces 26 and 27 in the Z-axis direction of the tube 23 are exposed on both surfaces of the electromagnetic steel sheet 1 (both surfaces of the stator). A bolt 28 is passed through the tube 23 and the stator is fixed to a bed or the like (not shown) by the bolt 28. In the example shown in FIG. 1, the surface of the stator where the end surface 26 of the tube 23 is exposed corresponds to the bottom surface in contact with a bed or the like (not shown), and the bottom surface and the surface 5 (opposing surface) at the tip of the salient pole. A squareness is secured between them.

  The tubes 23 may be arranged in a straight line in the direction in which the stator extends. However, by disposing the tubes 23 at a distance L from each other in the Y-axis direction, a mover (not shown) is provided. Even if a magnetic attraction force is generated in the Y-axis direction between the stator (for example, the movable element 51 shown in FIG. 3A) and the stator according to the first embodiment, the stator falls down in the direction in which the force is applied. It is held all the time. Therefore, the distance L in the Y-axis direction is preferably as long as possible. Note that the magnetic path in the linear motor including the stator according to the first embodiment is formed so as to avoid the tube insertion hole 22 so as to pass from the salient pole 50 of the stator in the X-axis direction. Therefore, as long as the necessary magnetic path width is formed in the Y-axis direction, the tube insertion hole 22 does not affect the performance of the motor regardless of the position in the Y-axis direction.

  According to the stator according to the first embodiment, even if the L-shaped support base 20 shown in FIG. 6 is not used, between the facing surface formed by the front surface 5 of the salient pole 50 and the bottom surface of the stator. Since the perpendicularity can be secured, the stator can be downsized and the cost of the stator can be reduced. Therefore, by using the stator according to the first embodiment, the linear motor can be miniaturized and the cost of the linear motor can be reduced.

  Next, with reference to FIG. 2, the stator of the linear motor which concerns on 2nd Embodiment of this invention is demonstrated. FIG. 2 is a diagram showing a stator of a linear motor according to the second embodiment of the present invention. Fig.2 (a) is the top view which looked at the stator from the minus Z direction which is a lamination direction of an electromagnetic steel plate, and is the figure seen from the same direction as Fig.3 (a). FIG. 2B is a view of the stator as viewed from the Y-axis direction.

  The stator of the linear motor according to the second embodiment is formed by stacking a plurality of electromagnetic steel plates 1 in the stacking direction (Z-axis direction). The stator has a predetermined interval along the direction (longitudinal direction) in which the stator (magnetic steel sheet 1) extends from the plurality of laminated magnetic steel sheets 1 in the short direction of the stator (magnetic steel sheet 1). The salient poles 50 are formed at intervals of the pitch P. The tip surface 5 of the salient pole 50 is a flat surface, and the tip surface 5 is disposed so as to face a movable element (not shown) (for example, the movable element 51 shown in FIG. 3A). That is, the face 5 at the tip of the salient pole 50 forms a facing surface that faces the mover.

  A plurality of pipe insertion holes 2 extending in the stacking direction and penetrating the electromagnetic steel sheet 1 are formed in the laminated electromagnetic steel sheets 1. The plurality of tube insertion holes 2 are formed side by side in the direction (longitudinal direction) in which the stator (the electromagnetic steel sheet 1) extends. In each of the tube insertion holes 2, a tube 3 is inserted so as to penetrate the electromagnetic steel sheet 1. The tube insertion hole 2 is formed in the X-axis direction, which is the direction (longitudinal direction) in which the stator (magnetic steel plate 1) extends so that the formation of the magnetic path by the mover 51 shown in FIG. , Formed so as to avoid the salient pole 50. The tube insertion holes 2 are formed at a distance L from each other in the Y-axis direction, which is the direction in which the salient poles 50 extend. The tube insertion hole 2 has a shape that fits with the tube 3 in the Y-axis direction, and is wider than the tube 3 in the X-axis direction so that a gap 2a is formed between the tube 3 and the tube 3. ing. The electromagnetic steel sheet 1 and the pipe 3 are integrated by a resin 4. The gap 2 a is filled with resin, and the tube 3 is fixed to the electromagnetic steel sheet 1. Thereby, the some electromagnetic steel plate 1 is fixed. Further, both surfaces of the electromagnetic steel sheet 1 are covered with the resin 4. The tube 3 penetrates the electromagnetic steel sheet 1 and both end surfaces of the tube 3 are exposed on both surfaces of the resin 4 (surfaces of the stator).

  After the electromagnetic steel sheet 1 and the tube 3 are integrated with resin, the surface 5 at the tip of the salient pole 50 facing the mover (not shown) (for example, the mover 51 shown in FIG. 3A), the bed (not shown), etc. The bottom surface 6 for fixing is processed. Alternatively, the plurality of electromagnetic steel plates 1 are laminated so that the tip surface 5 of the salient pole 50 is a flat surface, and then the bottom surface 6 is processed with reference to the tip surface 5. In addition, the surface where one end surface of the tube 23 is exposed in the stator corresponds to the bottom surface 6. By this processing, a necessary squareness is ensured between the front surface 5 (opposing surface) and the bottom surface 6 of the salient pole 50. Both end surfaces of the tube 3 in the Z-axis direction are exposed on both surfaces of the stator (the surface of the resin 4). Then, the bolt 8 is passed through the tube 3, and the stator is fixed to the bed or the like by the bolt 8. If both end faces of the tube 3 are not exposed on the surface of the stator (the surface of the resin 4), the resin is present between the electromagnetic steel sheet 1 and the bed, so the bolt 8 is tightened. The resin may be damaged. On the other hand, in the stator according to the second embodiment, since both end faces of the tube 3 are exposed on both surfaces of the stator (the surface of the resin 4), the resin is prevented from being damaged even when the bolt 8 is tightened. be able to.

  Further, by disposing the tubes 3 at a distance L from each other in the Y-axis direction, the stator is held without falling in the direction in which the force is applied even if a force is applied in the Y-axis direction. Therefore, the distance L in the Y-axis direction is preferably as long as possible. In addition, the magnetic path in the linear motor provided with the stator according to the second embodiment is formed avoiding the tube insertion hole 2 so as to pass from the salient pole 50 of the stator in the X-axis direction. Therefore, if the necessary magnetic path width is formed in the Y-axis direction, the tube insertion hole 2 does not affect the performance of the motor regardless of the position in the Y-axis direction.

  Further, a gap 2 a is provided in the tube insertion hole 2. If each of the tube insertion hole 2 and the tube 3 has a circular cross-sectional shape and the tube insertion hole 2 and the tube 3 are fitted together, a gap between the tube insertion hole 2 and the tube 3 is assumed. In some cases, the resin is not sufficiently filled between the tube insertion hole 2 and the tube 3. In such a case, it is necessary to apply an adhesive to the tube 3 and insert it into the tube insertion hole 2 and fix it before casting the resin 4. On the other hand, according to the stator according to the second embodiment, since the gap 2a is filled with the resin, the tube 3 can be fixed to the electromagnetic steel sheet 1 without using an adhesive. As a result, the number of work steps can be reduced, and the cost of the stator can be reduced. Further, a gap 2a is provided in the tube insertion hole 2 in the X-axis direction, and the tube insertion hole 2 and the tube 3 are fitted with a slight gap in the Y-axis direction. For this reason, even if a magnetic attraction force is generated between a not-shown mover (for example, the mover 51 shown in FIG. 3A) and the stator, the tube 3 is fixed to the electromagnetic steel sheet 1 and moves in the Y-axis direction. Deviation is suppressed. Since the gap 2a is formed in the X-axis direction and not in the Y-axis direction, the magnetic path formed in the Y-axis direction is not hindered.

  The shape of the tube insertion hole 2 is not limited to the shape shown in FIG. For example, the tube insertion hole 2 has a circular cross-sectional shape, and even if the tube 3 has a two-sided width in the X-axis direction, a gap filled with resin is formed in the X-axis direction. The effect similar to the stator which concerns on a form can be show | played.

  According to the stator according to the second embodiment, the gap between the opposing surface formed by the tip surface 5 of the salient pole 50 and the bottom surface 6 of the stator can be obtained without using the L-shaped support base 20 shown in FIG. Therefore, the stator can be miniaturized and the cost of the stator can be reduced. Therefore, by using the stator according to the second embodiment, the linear motor can be miniaturized and the cost of the linear motor can be reduced.

  In the stator shown in FIGS. 1 and 2, salient poles are also provided on the surface opposite to the surface facing the mover (not shown) (for example, the mover 51 shown in FIG. 3A). However, it is not necessary to provide salient poles on the opposite surface. That is, the salient poles only need to be provided on one surface of the stator.

  The linear motor according to the present invention is not limited to the linear motor using the mover 51 shown in FIG. For example, the present invention can be applied to any linear motor that has a plurality of salient poles arranged at predetermined intervals on a surface facing the mover and is configured by laminating a plurality of electromagnetic steel plates.

  DESCRIPTION OF SYMBOLS 1 Magnetic steel plate, 2,22 pipe insertion hole, 3,23 pipe, 4 resin, 8,28 bolt, 20 L-type support stand, 26, 27 end surface, 50 salient pole, 52a, 52b Stator.

Claims (5)

A plurality of electromagnetic steel sheets laminated, a plurality of electromagnetic steel sheets formed with a plurality of tube insertion holes penetrating in the direction of lamination; and
A plurality of salient poles protruding from the plurality of electromagnetic steel plates and arranged at predetermined intervals along a longitudinal direction of the plurality of electromagnetic steel plates;
A plurality of tubes penetrating the plurality of electromagnetic steel sheets and fitted into each of the plurality of tube insertion holes;
Have
By fitting the plurality of tubes into the plurality of tube insertion holes with an adhesive or the like, the plurality of electromagnetic steel plates are fixed,
The plurality of tube insertion holes are formed side by side in the longitudinal direction of the plurality of electromagnetic steel plates,
An end surface of the tube corresponding to a surface that is in contact with a member to which the stator is fixed and the stator is exposed to protrude from the surface of the electromagnetic steel sheet
A stator for a linear motor. A plurality of electromagnetic steel sheets laminated, a plurality of electromagnetic steel sheets formed with a plurality of tube insertion holes penetrating in the direction of lamination; and
A plurality of salient poles protruding from the plurality of electromagnetic steel plates and arranged at predetermined intervals along a longitudinal direction of the plurality of electromagnetic steel plates;
A plurality of tubes penetrating the plurality of electromagnetic steel sheets and fitted into each of the plurality of tube insertion holes;
Have
By fitting the plurality of tubes into the plurality of tube insertion holes, the plurality of electromagnetic steel plates are fixed,
The plurality of tube insertion holes are formed side by side in the longitudinal direction of the plurality of electromagnetic steel plates,
The plurality of electromagnetic steel plates and the tube are integrated with resin, and both surfaces perpendicular to the penetration direction of the tube insertion hole of the electromagnetic steel plate are covered with resin,
The end face of the tube corresponding to the surface where the stator is fixed to the member to which the stator is fixed is exposed at both end faces of the resin covering the electromagnetic steel sheet,
A stator for a linear motor.   The tube insertion hole is formed so as to fit into the tube in the direction in which the salient pole extends, and a gap wider than the tube is formed in the longitudinal direction of the plurality of electromagnetic steel sheets. The linear motor stator according to claim 2, wherein the gap is filled with resin.   3. The linear motor stator according to claim 1, wherein the tube insertion hole is formed at a position avoiding the salient pole in a longitudinal direction of the plurality of electromagnetic steel plates.   3. The linear motor stator according to claim 1, wherein the tube insertion holes are formed to be spaced apart from each other in a direction in which the salient poles extend. 4.

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