JPH0318423B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention can guarantee the size of the magnetic gap (hereinafter simply referred to as gap) between the stator surface and the mover surface to a set value, and The present invention relates to a linear motor in which the side unit and the mover side unit are separated to facilitate attachment to equipment and to expand the degree of freedom.

[Conventional technology and problems]

In a linear motor, it is necessary to maintain a predetermined gap between a stator and a movable element that moves the stator in parallel. For this reason, conventional linear motors have these components integrated.

However, when incorporating the stator and mover into equipment, there are cases where the stator and mover must be separated and incorporated into the equipment separately, making it necessary to readjust the gap that separates the stator and mover. Therefore, it is difficult to adjust the gap to match the set value. Therefore, conventional methods depend solely on the machining accuracy of the parts and the assembly accuracy of the movable guide device, and the gap dimensions after assembly into the device are unknown. For this reason, the gaps of conventional linear motors often do not match the design values, and the gaps themselves are not uniform in the width direction and stroke direction. When the gap is not guaranteed to the set value as described above, variations in thrust force, imbalance, vibration, etc. occur, which poses a problem.

[Purpose of the invention]

This invention was made in consideration of the above circumstances, and it guarantees the gap between the stator side and the mover side, and also separates the stator side unit and the mover side unit so that they can be incorporated into equipment. The purpose is to provide a linear motor with improved degree of freedom.

[Summary of the invention]

In order to achieve the above object, a linear motor according to the present invention is constructed such that a stator frame to which a stator is attached and a slider frame to which a slider is movably attached are assembled with their respective mounting surfaces abutting each other, and The stator surface of the child is positioned with reference to the mounting surface of the stator frame, and the position of the slider surface of the slider is adjustable in the height direction with reference to the mounting surface of the slider frame. .

〔Example〕

EMBODIMENT OF THE INVENTION Hereinafter, one embodiment of the linear motor according to the present invention will be specifically described with reference to the accompanying drawings.

FIG. 1 is a cross-sectional view of one embodiment of the present invention, and FIG. 2 is a cross-sectional view taken along the line --. In these figures, the stator frame 2 is attached to the outside A side of a mounting frame 18 of the device, and the mover frame 9 is provided to the inside B side of the device. The stator 1 is installed in the stator frame 2, and the mover 4 is installed in the mover frame 9, forming a stator side unit and a mover side unit that can be separated from each other. There is. In this case, the stator 1 is provided with a winding 3 in a direction perpendicular to its axial direction, and the mover 4 is
A secondary conductor 6 such as a copper plate is provided on the surface of the stator facing the stator surface 17 to form a mover surface 5. The mover 4 is fixedly supported by a mover keel 7 extending in the same direction as the mover, and the mover keel 7 has guide rails 8 on both sides in the width direction.
are attached by bolts, and the guide rail 8 engages with a plurality of rollers 10 provided inside the slider frame 9. Thereby, the mover 4 can be moved in its length direction via the rollers. Each roller 10 is a grooved roller, for example, a roller bearing is used, and the roller 1
A roller shaft 11 that supports 0 is inserted into a shaft hole 19 bored in the slider frame 9.
This roller shaft 11 is connected to the shaft hole 1.
The roller 10 can be moved vertically within the roller 9, thereby allowing the position of the roller 10 to be adjusted in the height direction. For this reason, the roller shaft 11 is formed as a stepped shaft in which a large-diameter shaft portion 11a and a small-diameter shaft portion 11b are connected, and the shaft hole 1
9 is also formed as a stepped hole, a large diameter shaft portion 11a protrudes into the slider frame 7 and the roller 10 is rotatably attached thereto, a small diameter shaft portion 11b is supported in the shaft hole 19, and the large diameter shaft portion 11a is rotatably attached to the slider frame 7. A spring 12 such as a disc spring is inserted into the diameter shaft portion 11a, and the roller shaft 11
is energized to move upward. Further, the small diameter shaft portion 11b of the roller shaft 11 has a male screw 20.
This male screw 20 protrudes outward from the slider frame 9, and the position adjustment nut 13 is screwed into the male screw 20.
Therefore, by adjusting the tightening amount of the position adjustment nut 13, the roller shaft 11 is moved in the axial direction by the urging force of the spring 12, and the position of the roller 10 is adjusted in the height direction. Furthermore, among the rollers 10 provided on both sides of the mover keel 7 in the width direction, the roller located on one side in the width direction is formed so that its position can be adjusted in the width direction. FIG. 3 is a cross-sectional view showing a structure for making such width direction adjustment.
The axial center of the roller shaft 11 and the axial center of the roller shaft 11 are eccentric by a dimension e, and by adjusting this eccentric amount e, the position of the roller in the width direction is adjusted.

The stator frame 2 and the movable frame 9 have their mounting surfaces 15
and 16 are butted and assembled, respectively, and the mounting surface 15 of the stator frame 2 is set to be flush with the stator surface 17 of the stator 1, and
The slider surface 5 of the slider 4 is the mounting surface 16 of the slider frame 9.
The magnetic gap size g is set to be lower than that of the magnetic gap. As a result, the mounting surface 1 of the slider frame 9
6 is brought into contact with the mounting surface 15 of the stator frame 2, thereby creating a magnetic gap g.

Next, the assembly of this embodiment configured as above will be explained. Connect the stator frame 2 to the equipment mounting frame 18
from the outside, and abut the mounting surface 15 of the stator frame 2 against the mounting surface 16 of the slider frame 9. As a result, the distance between the stator surface 17 and the movable surface 5 becomes equal to the magnetic gap dimension g. Next, mover frame 9
Using the mounting surface 16 as a reference, use a depth gauge or a gap indexing jig to measure this distance and adjust it to the set gap. This adjustment is performed by rotating the position adjustment nut of the roller 10 to adjust the tightening amount and moving the roller 10 in the height direction. In this case, mover 4
It is preferable to adjust the bolt 14, which is the axis of the roller, so that it does not shake in the width direction. After adjusting the set gap, it is only necessary to fix the slider frame 9 to the stator frame 2 with screws, so that the distance between the stator surface 17 and the slider surface 5 is automatically adjusted to be equal to the set gap. guaranteed. In such assembly, the stator side unit can be attached from the outside of the equipment, and the long mover and the mover unit with the mover frame can be installed from the inside of the equipment, so installation workability and maintainability are improved. ing.

Note that the present invention is not limited to the above-mentioned embodiments, and various modifications can be made. For example, in the embodiment described above, the case where the mover is long is shown, but it can be assembled in the same way even when the stator is long. In this case, it is possible to attach rollers to the slider and attach rails to the slider frame. In addition, the gap size g is adjusted so that the slider surface 5 and the mounting surface 16 of the slider frame 9 are on the same plane, and the stator surface 17 of the stator 1 is adjusted by a distance g from the mounting surface 15 of the stator frame 2. You can also set it low. Furthermore, roller 10
Regarding the eccentricity between the bolt 14 and the roller shaft 11, the bolt 14 and the roller shaft 11 are coaxially centered, and a collar 21 whose inner circumferential axis and outer circumferential axis are eccentric is used, as shown in FIG. , this collar 21 may be inserted between the bolt 14 and the roller 10.

To adjust the gap between the stator teeth and the slider teeth in conventional linear step motors of this type, there is a device that moves the slider up and down by screwing into the roller shaft of the roller that rotates the slider. However, it is difficult to maintain the magnetic gap accurately, and as in the present invention, the gap can be adjusted before assembly by establishing a predetermined relationship between the stator and the stator frame or the slider and the slider frame. There is no other superior means that can easily and reliably hold the material with high precision.

〔Effect of the invention〕

As described above, according to the present invention, the stator frame and the slider frame are assembled with their mounting surfaces butted against each other, and the stator surface of the stator is positioned based on the stator mounting surface, and the slider is moved. Since the position of the child surface can be adjusted in the height direction with reference to the mounting surface of the slider frame, the magnetic gap between the stator surface and the slider surface can be adjusted using only the slider side unit before installation into the equipment. The magnetic gap can be adjusted easily and precisely. For this reason, a predetermined thrust can be obtained, no imbalance will occur, and vibrations will be reduced. In addition, since the stator side unit and the mover side unit are configured separately, the degree of freedom in assembling the device into equipment is expanded, and its workability and maintainability are also improved.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of one embodiment of the present invention, Fig. 2 is a sectional view taken along the - line, Fig. 3 is a sectional view showing a roller mounting structure, and Fig. 4 is a sectional view of another embodiment of the collar. be. 1... Stator, 2... Stator frame, 4... Mover, 5...
Mover surface, 7... Mover keel, 8... Rail, 9...
Mover frame, 10...Roller, 11...Roller shaft, 12...Spring, 13...Roller position adjustment nut,
15...Mounting surface of stator frame, 16...Mounting surface of mover, 17...Stator surface, 20...Male thread, g...Magnetic gap.

Claims (1)

[Claims] 1. A stator frame and a mover frame that are attached with their mounting surfaces aligned with each other, and the stator frame has a stator surface positioned with reference to the mounting surface of the stator frame. The stator is attached, and the slider frame is provided with a slider that is movable in its length direction via a roller that is rotatably supported by the slider frame. Guide rails are installed in the movement direction of the slider on both sides of the child keel in the width direction, and a plurality of rollers that engage with these guide rails are installed inside the slider frame so that their positions can be adjusted in the height direction, One of the rollers in the width direction is mounted so that its position can be adjusted in the width direction, and the slider surface can be adjusted in the height direction with respect to the mounting surface of the slider frame that is used as a positioning reference. linear motor. 2. The rollers are rotatably supported at the other end of a stepped roller shaft having a male thread formed at one end, and a spring is inserted into the stepped roller shaft hole formed in the slider frame. Interpose,
2. The linear motor according to claim 1, which is movable in the axial direction, and has a male screw at one end projected outside the slider frame and is fitted therein, and a position adjustment nut is screwed onto the male screw. 3. The linear motor according to claim 1 or 2, wherein the rollers on one side are rotatably attached to a roller shaft with the axes of these rollers and the axis of the roller shaft being eccentric. motor. 4 Set the stator surface of the stator and the mounting surface of the stator frame on the same plane, and set the mounting surface of the slider frame to the stator frame in advance.
The linear motor according to any one of claims 1 to 3, wherein the magnetic space dimension between the moving element surfaces of the moving element is adjusted to be lower.