JP2001224159A - Linear slider - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an accurate and safe linear slider, assuring easier process to lay the power feeding cable or air piping by reducing the heat to be transferred to a table form an armature portion. SOLUTION: In the linear slider easing the table 4 for a fixing tray 1 to more freely with a linear motor 5, there is provided a structure where an air duct 13 is provided to circulate the cooling air in the moving direction of a rotor 11 within the table 4, an intermediate seat 12 having the width size b2 narrower than a horizontal width b1 of an armature portion is provided between the table 4 and the armature portion as the rotor 11, and the cooling air is exhausted toward an armature coil 9 of the rotor 11 via a space portion S from an exhaust port 13B of the air duct 13. Thereby, when the rotor 11 is moved, the heat generated from the armature portion is effectively removed to control transfer of heat to the table and thermal deformation.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a linear slider for freely moving a table with respect to a fixed table by a linear motor, and more particularly to a cooling structure for a mover.

[0002]

2. Description of the Related Art Conventionally, a linear slider capable of freely moving a table with respect to a fixed base by a linear motor is shown in FIG. FIG. 5 is a front view showing a conventional linear slider. The linear motor will be described using an example of a magnetic flux penetration type structure. In the figure, 1
Is a fixed base, 2 is guide rails provided on both right and left ends of the fixed base 1, and 3 is a slider which forms a linear guide in combination with the guide rail 2. Reference numeral 5 denotes a linear motor, 6 denotes a plate-shaped field yoke fixed to the fixed base 1 so as to face each other in the vertical direction, and 7 denotes a magnetic pole that alternates along the field yoke 6 (in the direction perpendicular to the paper). A plurality of permanent magnets 8 are provided facing the permanent magnet 7 with a magnetic gap therebetween, and an armature core formed by laminating electromagnetic steel sheets in the height direction of the permanent magnet 7. An armature coil wound around the winding accommodating portion of the core 8 and fixed with a resin mold. In such a linear motor 5, a stator 10 (linear motor field portion) is constituted by a field yoke 6 and a field permanent magnet 7;
The armature core 8 and the armature coil 9 constitute the mover 11 (linear motor armature section). Reference numeral 19 denotes an armature fixing plate, which has a width b2 wider than the horizontal river width b1 of the linear motor armature portion, and 24 denotes an armature fixing plate.
It is a table provided above. The armature fixing plate 19 is fastened to the table 24 by screwing a bolt having an external thread (not shown) from the table 4 side, and the armature core 8
Is screwed into the female screw 19A from the armature core 8 side through the through hole 8A, and fastened to the armature fixing plate 19. Further, reference numeral 20 denotes an air duct provided inside the armature fixing plate 19, which exchanges heat generated in the linear motor armature portion by flowing cooling air through the air duct 20,
The armature fixing plate 19 is used to prevent heat from being transferred to the table 24.
Cooling.

[0003]

However, the prior art has the following problems. (1) In the linear slider, since the linear motor armature portion serving as the mover is attached to the armature fixing plate 19 having a larger contact area, heat generated by the linear motor armature portion can be easily transmitted to the armature fixing plate 19. However, when the heat generation amount of the armature portion is increased to increase the thrust of the linear motor 5, the cooling capacity is limited only by a fixed amount of cooling air flowing through the air duct 20. Thus, when the heat generated in the armature portion cannot be removed by the air in the air duct 20, the heat in the armature portion is transferred to the table 24 via the armature fixing plate 19 to cause thermal deformation or to be attached to the table 24. There is a problem that the linear guide and a linear scale (not shown) are adversely affected, and an error in the positioning accuracy of the table 24 occurs. (2) In addition, a power supply cable (not shown) and an air supply tube for supplying cooling air to the air duct pass from the armature coil 9 to the upper surface side of the table 24, and supply a control power supply and an air supply unit, respectively. (Not shown in the drawing), the processing of the power supply cable and the air supply tube was complicated due to the long distance until the wire was pulled out. (3) The power supply cable may be damaged when a work or tool (not shown) mounted on the table 24 or an external object comes into contact with the power supply cable due to some trouble. The present invention has been made in order to solve the above-described problem, and reduces the heat transferred from the armature to the table, and can easily process the power supply cable and the air piping, thereby achieving high precision and safety. It is an object to provide a linear slider.

[0004]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, a linear guide comprising a guide rail and a slider for movably guiding and supporting a table arranged in parallel with a fixed base is provided. A linear motor that reciprocates the table with respect to the fixed table along a longitudinal direction on the guide rail, the linear motor includes:
A stator that constitutes two linear motor field portions that are vertically opposed to each other on the fixed base and that are arranged oppositely, and a linear motor armature portion that is arranged with an air gap between the stators. In the linear slider configured to move the table by supplying a drive current to the linear motor through a power supply cable, a linear slider is provided between the table and the mover of the linear motor. A column-shaped spacer having a width smaller than the width of the horizontal cross section of the mover is provided, and the table and the mover are respectively fastened to the spacer by bolts. In the moving direction of the mover, an air duct is provided for flowing cooling air, and the air duct is provided with a mover of the table. It is provided with a plurality of discharge ports for discharging cooling air toward the movable element facing surfaces. Also,
According to a second aspect of the present invention, in the linear slider according to the first aspect, the table is provided with a concave portion for fitting the spacer on a surface facing the movable element.
According to a third aspect of the present invention, in the linear slider according to the first or second aspect, the air duct is configured as a separate conduit instead of being provided inside the table, and the conduit is connected to the table. A notch for fixing is provided. The present invention described in claim 4 is:
4. The linear slider according to claim 1, further comprising a slide mechanism that guides and supports the power supply cable along with the movement of the mover, on a side surface of the linear slider on the fixed base. 5. A cable bear is provided. The present invention according to claim 5 provides the invention according to claims 1 to 4.
In the linear slider according to any one of the above, an air supply tube for supplying cooling air to the air duct is passed through the cable carrier, and the air supply tube is guided and supported together with the power supply cable. It is like that. According to a sixth aspect of the present invention, in the linear slider according to any one of the first to fifth aspects, the linear motor field portion of the linear motor is arranged along a field yoke made of a magnetic material. The linear motor armature portion is constituted by a plurality of permanent magnets having different magnetic poles alternately, and the armature coil is wound around an armature core. According to a seventh aspect of the present invention, there is provided the linear slider according to any one of the first to fifth aspects, wherein the linear motor field portion of the linear motor has an inductor tooth made of a magnetic material. The linear motor armature portion is constituted by an armature coil wound around the armature core and a permanent magnet provided at the tip of a tooth portion of the armature core.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a front view of a linear slider showing a first embodiment of the present invention. FIG. 2 is a plan view of the linear slider of FIG. 1 as viewed in the direction of arrow A, and shows a table and a linear motor armature portion seen through the table. FIG. 3 is a side view of the linear slider of FIG. 1 viewed from the direction of arrow B, and shows a state in which a fixing base, a linear guide, and a linear motor armature are removed. This embodiment shows an example of a linear motor having a magnetic flux penetration structure as in the prior art, and components different from those in the related art will be denoted by the same reference numerals, and description thereof will be omitted, and only different points will be described. In the figure, 4 is a table, 4A is a recess, 12 is a spacer, 12A is a female screw, 13 is an air duct, 13A is an air supply port, 13B is a discharge port, 14 is a power supply cable, 15 is a cable carrier, and 16 is air supply. The tube, 17 is a bolt, and 18 is a mold resin. The difference of the present invention from the conventional one will be described below. Between the table 4 and the mover 11 forming the armature portion of the linear motor,
A width b2 narrower than the width b1 of the horizontal river of the mover 11
Is provided with a columnar spacer 12 having. Thus, a space S is formed in a portion surrounded by the table 4, the mover 11, and the spacer 12. An air duct 13 for circulating cooling air in the moving direction of the mover 11 is formed in the interior of the table 4, and when viewed in a plan view of FIG.
It is formed in a character shape. The air duct 13 is provided with a plurality of discharge ports 13B for discharging cooling air from an air supply port 13A vertically toward the mover 11 on a surface of the table 4 facing the mover 11. The discharge ports 13B are provided at regular intervals at positions facing the armature coil 9 as shown in FIG. The table 4 is provided with a concave portion 12A for fitting the spacer 12 on the surface facing the mover 11, and when fastening the spacer 12 to the mover 11, a bolt 17 having a male screw is used. Through hole 8 from the lower side of armature core 8
A, and screwed into the female screw portion 12A, and when fastening the spacer 4 to the table 4, a bolt (not shown) is passed through a through hole (not shown) on the upper side of the table 4 to insert the spacer 1.
2 is screwed and fixed to the other female screw portion (not shown). Further, a cable carrier having a slide mechanism for guiding and supporting a power supply cable 14 for supplying a drive current to the armature coil 9 with the movement of the mover 11 is provided on the side surface of the linear slider on the fixed base 1. 15 are provided,
An air supply tube 16 for supplying air to the air duct 13 is passed through the cable bear 15, and a power supply cable 14 is provided.
In addition, it guides and supports the air supply tube 16. Next, the operation will be described. In the above-described configuration, the movable element 11 generates a constant thrust by supplying a driving current from a power source (not shown) to the armature coil 9. As a result, as the mover 11 moves on the guide rail 2 with respect to the fixed base 1, the air duct 1 provided inside the table 4 is moved.
The cooling air supplied to the third air supply port 13A is discharged from the discharge port 13B through the space S to the upper part of the armature coil 9 as the mover 11, as shown by the arrow in the figure, and is generated in the armature part. The generated heat is removed by the cooling air and is radiated to the outside through the space between the linear guide and the electric unit. Thus, by directly applying cooling air to the armature portion, heat transfer to the table 4 and thermal deformation can be suppressed. As for the power supply cable 14 and the air supply tube 16, when the mover 11 moves on the guide rail 2 with respect to the fixed base 1, the power supply cable 14 and the power supply cable pulled out from the armature coil 9 side and the table 4 side, respectively. Care tube 16 is cable carrier 1
Move in 5. The cable carrier 15 supports the power supply cable 14 and the air supply tube 16 and functions as a guide.
There is no possibility that the work, tool or external object mounted on the power supply cable 14 or the air supply tube 16 will be damaged due to the contact. Therefore, the linear slider of the present invention has an air duct for circulating cooling air inside the table, and has a width smaller than the horizontal width of the armature so as to form a space between the table and the armature which is the mover. Since a spacer having a narrow width is provided and cooling air is discharged from the discharge port of the air duct toward the armature coil of the mover, for example, an electric motor generated when the mover is moved with high thrust. The heat of the child part can be efficiently removed by the cooling air. As a result, the cooling air can be directly applied to the armature part, so that heat transfer to the table and thermal deformation can be suppressed, and high accuracy can be achieved without affecting the positioning accuracy of the linear guide and linear scale. Can be provided.
In addition, since the power supply cable and the air supply tube are configured to be supported and guided in the cable bear, the distance from the power supply cable and the air supply tube to the cable bear can be connected with the shortest distance. The air supply tube can be easily processed without being routed as in the conventional case. As a result, it is possible to provide a safe linear slider without a work, a tool, or an external object mounted on the table being in contact with the power supply cable or the air supply tube and being damaged while the mover is moving. Next, a second embodiment of the present invention will be described. FIG. 4 is a front view of a linear slider according to a second embodiment of the present invention.
In the figure, 4B is a cutout provided in the table, 2B
1 is a conduit for supplying cooling air. The second embodiment is different from the first embodiment in that an air duct is provided inside the table 4 instead of being provided with a separate conduit 21 and the surface of the table 4 facing the space S. Is provided with a rectangular cutout 4B, and the conduit 21 is fixed to the cutout 4B. The operation is the same as that of the first embodiment, and a description thereof will be omitted. In this embodiment, by adopting such a configuration, not only can the armature portion be efficiently cooled, but also the structure using the conduit as a separate part without processing the air duct inside the table can reduce the manufacturing cost. There is also an advantage that the number of steps can be reduced. In this embodiment, the armature portion of the linear motor is constituted by the armature coil wound around the armature core, but may be a coreless armature constituted by only the armature coil excluding the armature core. Absent. Regarding the characteristics of the linear motor, the same characteristics as those of the linear motor described in this embodiment can be obtained. Further, in this embodiment, the linear motor field portion is constituted by an inductor having an inductor tooth made of a magnetic material, and the linear motor armature portion is formed by an armature core through which magnetic flux passes and an armature core. It may be replaced with a wound armature coil and a permanent magnet provided at the tip of the tooth portion of the armature core. Regarding the characteristics of the linear motor, the same characteristics as those of the linear motor described in this embodiment can be obtained. In this embodiment, the linear motor has been described using the example of the magnetic flux penetrating type structure. No problem.

[0006]

As described above, the present invention has the following effects. (1) An air duct for circulating cooling air is provided inside the table of the linear slider, and a width dimension smaller than the horizontal width of the armature portion so as to form a space between the table and the armature portion which is a movable element. Since the cooling air is discharged from the discharge port of the air duct toward the armature coil of the mover, for example, the armature portion generated when the mover is moved with high thrust is provided. Heat can be efficiently removed by the cooling air. As a result, the cooling air can be directly applied to the armature part, so that heat transfer to the table and thermal deformation can be suppressed, and high accuracy can be achieved without affecting the positioning accuracy of the linear guide and linear scale. Can be obtained. (2) In addition, since the power supply cable and the air supply tube are configured to be supported and guided in the cable bear, the distance from the power supply cable and the air supply tube to the cable bear can be minimized. Moreover, these cables and tubes can be easily processed without being routed as in the related art. As a result, a safe linear slider can be obtained without the workpiece, tool or external object mounted on the table being in contact with the power supply cable or the air supply tube being damaged while the mover is moving. (3) Further, since the separate duct is fixed to the table in place of the configuration in which the air duct is provided inside the table, the armature portion can be efficiently cooled and the duct is formed as a separate part. As a result, manufacturing costs and man-hours can be reduced.

[Brief description of the drawings]

FIG. 1 is a front view of a linear slider showing a first embodiment of the present invention.

FIG. 2 is a plan view of the linear slider of FIG. 1 as viewed from the direction of arrow A, and shows a table and a linear motor armature portion seen through the table;

FIG. 3 is a side view of the linear slider of FIG. 1 as viewed in the direction of arrow B, and shows a state where a fixed base, a linear guide, and a linear motor armature are removed.

FIG. 4 is a front view of a linear slider showing a second embodiment of the present invention.

FIG. 5 is a front view showing a conventional linear slider.

[Explanation of symbols]

 1: fixed base 2: guide rail 3: slider 4: table 4A: concave portion 5: linear motor 6: field yoke 7: permanent magnet 8: armature core 8A: through hole 9: armature coil 10: stator (linear) Motor field part) 11: mover (linear motor armature part) 12: spacer 12A: female screw part 13: air duct 13A: air supply port 13B: discharge port 14: power supply cable 15: cable carrier 16: air supply tube 17: Bolt 18: Mold resin 21: Conduit S: Space

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Masahiko Tanabe 2-1 Kurosaki Castle Stone, Yawatanishi-ku, Kitakyushu City, Fukuoka Prefecture F-term (reference) 5H609 BB03 BB08 BB12 BB18 PP02 PP07 PP08 PP09 QQ02 RR27 RR37 5H641 BB06 BB11 BB19 GG03 GG04 GG08 GG12 GG15 HH02 HH12 JA09 JB04

Claims (7)

[Claims] 1. A linear guide comprising a guide rail and a slider for movably guiding and supporting a table disposed in parallel to a fixed base and facing the fixed base, and moving the table relative to the fixed base along a longitudinal direction on the guide rail. A linear motor that reciprocates the linear motor, the linear motor comprises a stator that constitutes two linear motor field portions that are vertically opposed to each other on the fixed base and that are spaced apart from each other; A linear slider comprising a mover that constitutes a linear motor armature portion disposed with an air gap therebetween, and configured to move the table by supplying a drive current to the linear motor via a power supply cable; And between the mover of the linear motor,
A column-shaped spacer having a width smaller than the width of the horizontal river of the mover is provided, and the table and the mover are fastened to the spacer by bolts, respectively. Inside, an air duct is provided which is bored in the moving direction of the mover, and through which cooling air flows, and the air duct is provided on a surface of the table facing the mover toward the mover. A linear slider having a plurality of discharge ports for discharging cooling air. 2. The linear slider according to claim 1, wherein the table is provided with a concave portion for fitting the spacer on the surface facing the movable element. 3. The air duct according to claim 1, wherein the air duct is provided inside the table instead of a separate pipe, and the table is provided with a cutout for fixing the pipe. 3. The linear slider according to 2. 4. A cable carrier having a slide mechanism for guiding and supporting the power supply cable in accordance with the movement of the mover is provided on a side surface of the linear slider on the fixed base. The linear slider according to claim 1. 5. An air supply tube for supplying cooling air to the air duct through the cable carrier, and guides and supports the air supply tube together with the power supply cable. The linear slider according to any one of the above. 6. The linear motor field part of the linear motor is constituted by a plurality of permanent magnets having different magnetic poles alternately along a field yoke made of a magnetic material. The linear slider according to any one of claims 1 to 5, comprising an armature coil wound around an armature core. 7. The linear motor, wherein the linear motor field portion is formed of an inductor having inductor teeth made of a magnetic material, and the linear motor armature is wound around an armature core. The linear slider according to any one of claims 1 to 5, comprising: an armature coil formed by the armature coil; and a permanent magnet provided at a tip of a tooth portion of the armature core.