JPH0122393Y2 - - Google Patents

Description

[Detailed explanation of the invention] This invention relates to a moving coil type linear motor.
In particular, it relates to the structure of the stator housing.

As shown in Japanese Patent Application Laid-Open No. 55-83454, a conventional moving coil type linear motor has permanent magnet pieces magnetized in the thickness direction arranged in close contact with each other in the longitudinal direction on the inner surface of the yoke. Therefore, a large number of expensive magnet pieces are required, and moving coils that move through the gap between the magnet pieces in a direction perpendicular to the magnetic flux are stacked in the direction of the gap, and only one of these moving coils is controlled to be energized by switching alternately. Therefore, the air gap distance is long and the effective current interlinking with the magnetic flux is also small, so the output is relatively small. Furthermore, since the yokes on which the magnet pieces are disposed are connected only at both ends by side yokes and are arranged facing each other, it is difficult to maintain the gap distance between the magnet pieces with high precision. Furthermore, in conventional moving coil type linear motors, a long lead wire is led out from the moving coil and the energization of the moving coil is controlled via this lead wire, so it is difficult to obtain a vertically elongated linear motor, and the lead wire is easily disconnected. There are many problems such as the use of expensive and complicated control circuits.

This invention was made in view of the above-mentioned problems, and aims to provide a moving coil type linear motor that can maintain the gap distance between the permanent magnet pieces with high accuracy.

That is, the inventor of this invention first placed flat permanent magnet pieces magnetized in the thickness direction on the inner surfaces of opposing yokes so that the polarities facing each other were different, and the polarities of adjacent ones were different. , a stator disposed in the longitudinal direction with an interval equal to the width of the magnet pieces, and a stator that can move in a direction perpendicular to the magnetic flux in the gap between the magnet pieces, and has a thickness of the winding part and the air core part. A movable coil assembly comprising a plurality of movable coils whose width is the same as the width of the magnet piece, shifted in the longitudinal direction by the width of the magnet piece, and a movable coil assembly provided with bent portions at the top and bottom. By proposing a type linear motor (Utility Application No. 58-74947),
A linear motor that uses fewer magnet pieces and has a large output is provided. In addition to the above configuration, the present inventor also installed a current collecting brush connected to the terminal of the moving coil on the upper part of the moving coil assembly, and provided a necessary power distribution pattern that comes into contact with the current collecting brush. By equipping overhead wires with
58-74948) provided a moving coil type linear motor that can control energization switching of a moving coil assembly without using long lead wires or a control circuit with a complicated circuit configuration. This idea further
In addition to the above-mentioned inventions, the present invention provides a moving coil type linear motor that can maintain the gap distance between permanent magnet pieces with high accuracy.

According to this invention, in addition to the configurations of the above-mentioned two inventions, a top plate portion provided with a groove for holding the overhead wire and a groove for holding the yoke in which the permanent magnet piece is arranged are provided. A moving coil type linear motor is provided, the main structure of which is a housing formed by integrally extruding a side plate portion provided with rail pieces that cover the upper and lower sides of the magnet pieces, and a yoke that extends over its entire length by the housing. Therefore, the distance between the gaps between the permanent magnet pieces is maintained with high accuracy, and the moving coil moves smoothly through the gaps.

Before explaining the configuration of this invention, first, a structural example that was studied before arriving at this invention based on conventionally known technology will be explained with reference to FIGS. 1 and 2. While devising the configuration of this invention from a conventionally known moving coil type linear motor, the inventor developed an iron plate channel 1 having a U-shaped cross section as shown in Fig. 1.
one in which permanent magnet pieces 2 are arranged and fixed on the opposing inner surfaces of the , and a rectangular iron plate channel 1A in which permanent magnet pieces 2 are arranged and fixed as shown in FIG.
1B so that the magnet pieces 2 face each other with a required gap distance, and in either case, the overhead wire 3 for supplying power to the moving coil is connected to the iron plate channels 1, 1A, and 1B. It was attached using double-sided adhesive tape. Further, in each case, a band-shaped resin piece 4 forming a rail piece was attached to the movable coil sliding surface on the upper and lower surfaces of the magnet piece 2. However, in the former case, the work of fixing the magnet piece 2 to the inner surface of the U-shaped iron plate channel 1 is troublesome. In the latter case, it is difficult to accurately maintain the air gap distance G between the magnet pieces 2 when assembling the square iron plate channels 1A and 1B. In addition, overhead wire 3 and steel plate channels 1, 1A, 1
Due to the difference in coefficient of thermal expansion from B, it was found that there were problems such as waving in the overhead wire 3 during use, which hindered the movement of the movable coil.

This idea uses an extruded aluminum or resin shape as the stator housing to improve assembly workability, ensure stable accuracy of the gap distance between magnet pieces, secure coil sliding surface, and eliminate problems caused by elongation of overhead wires. A groove is provided in the housing to hold the yoke and the overhead line, in which the magnet piece is arranged and fixed, and the yoke and the overhead line are inserted from the end face of the housing, and by aligning each standard, the magnet piece is removed. and the relative position of the overhead wire. The overhead wire and yoke are not fixed to the housing, but are positioned within the housing by end covers attached to the end faces of the housing so that they do not shift.

Next, the configuration of this invention will be explained with reference to the embodiments shown in FIGS. 3 to 7.

FIG. 3 shows an aluminum plate with a groove 10A for holding the overhead wire 13 that supplies power to the moving coil 16, and a groove 10B for holding the yoke 11 with the permanent magnet piece 12 arranged and fixed thereon. Alternatively, it is a sectional view showing a housing 17 made of an extruded resin member. As shown in Figures 4 to 7,
The overhead wire 13 made of a flexible printed circuit board and the yoke 11 are inserted into the housing 17 from the housing end face 17A to assemble the linear motor.
At this time, the overhead wire 13 is bent at the reference line at one end to create a bent portion 13A, and the top plate portion 17 of the housing 17 is bent until the fold hits the housing end surface 17A.
Insert it into the groove 10A at B. Regarding the yoke 11, insert the yoke 11 into the groove 10B provided in the side plate portion 17c and insert it up to the housing end face 17A, then push the yoke 11 further into the housing 17 with the L-shaped end face cover 15, and remove the end face cover 15.
Insert until the vertical surface of the housing touches the housing end surface 17A. The bent portion 13A of the overhead wire 13 is held down by the end cover 15 and the housing end surface 17A to prevent the overhead wire 13 from shifting within the housing 17. The moving coil assembly 16 is placed in the housing 17, and the end cover 15 is also attached to the other end of the housing 17. The length of the yoke 11 is such that it is fixed within the housing 17 by the end covers 15, 15. 18 is a current-carrying brush fixed to the movable coil assembly 16;
Reference numeral 9 indicates a mounting hole drilled in the housing 17, and reference numeral 20 indicates a mounting hole drilled in the end cover 15. Electric brush 1
8A is connected to the terminal of the moving coil 16A, and the energizing brush 18B is connected to the terminal of the moving coil 16B. The moving coil assembly 16 is a combination of moving coils 16A and 16B whose winding portions and air core portions have the same thickness as the width of the magnet piece 12 and are shifted by the width of the magnet piece 12 in the longitudinal direction. , this assembly 16 has bent portions 1 on its upper and lower sides.
6D, and in front and behind it are hanging parts 16C on which curtain hooks or the like are hung when a curtain or the like is driven to open or close by the movable coil assembly 16.

7, 8, and 9 show the basic configuration such as the arrangement of the permanent magnet pieces 12 in the yoke 11, the relationship between the overhead wire 13, the moving coil assembly 16, and the magnet pieces 12, and show the permanent magnet pieces 12 in the yoke 11. The width of the moving coil assembly 16 is 4l, and the width of the moving coil assembly 16 is 4l.
The center width of the power distribution patterns 13A and 13B in the overhead wire 13 is 2l, and the interval between adjacent magnet pieces 12 is l.

According to the above configuration, the relative position between the overhead wire 13 and the magnet piece 12 is determined, and the power distribution pattern 13 of the overhead wire 13 is determined.
The movable coil assembly 16 can be moved by energizing A and 13B. That is, overhead wire 1
When power is applied to power distribution patterns 13A and 13B of No. 3,
Current flows simultaneously in different directions to both the movable coils 16A and 16B of the movable coil assembly 16 via the energizing brushes 18A and 18B, and this current and the magnetic flux in different directions caused by the adjacent permanent magnet pieces 12 cause Fleming. According to the left-hand rule, a thrust force acts on the moving coil assembly 16 in the direction of arrow R in FIG.
Then, the moving coil assembly 16 is guided by the rail piece 14 by the bending portion 8D and moves to the right in FIG. The moving coil 16B is not energized due to the mutual position of the current collecting brush 18B and the overhead wire 13 only at the moment when the magnet piece 12 enters between the adjacent magnet pieces 12 where the direction of the magnetic flux changes.
After this instant, the current flows through the moving coil 16B in a different direction, so this repetition causes the moving coil assembly 16 to continue moving in the direction of arrow R. In order to move the moving coil assembly 16 backward to the left in the direction opposite to the arrow R, power distribution patterns 13A,
13B should be energized with the opposite polarity.

As stated above, since this invention has the above-mentioned configuration, it is possible to maintain the gap distance between the permanent magnet pieces with high precision, and the moving coil assembly can be moved smoothly in this gap. effective. In addition, there are many excellent effects such as the ability to easily ensure the levelness of the coil sliding surface and smoother movement of the movable coil assembly.

Further, according to the configuration of the above-described embodiment of this invention, the yoke can be positioned simply by inserting the yoke from the end face of the housing, making the assembly work more efficient. Only one end of the overhead wire is fixed to the housing at the reference position, and the other end is only held in the groove, and the other end is free in the length direction, so it is possible to prevent the overhead wire from waving due to expansion and contraction due to heat. There are advantages as an example, such as being able to.

[Brief explanation of the drawing]

Figures 1 and 2 are side sectional views showing structural examples that were considered before arriving at this invention based on conventionally known technology, and Figures 3 to 7 show an example of the linear motor that became this invention. Figure 3 is a side sectional view of the housing, Figure 4 is a side sectional view of the entire housing, and Figure 5 is a side sectional view of the housing.
The figure is a perspective view, FIG. 6 is a vertical sectional view, FIG. 7 is a front view of the moving coil assembly, FIGS. 8 and 9 are diagrams showing the basic structure of the linear motor, and FIG.
The figure is a bottom view schematically showing the relative position between the yoke and the moving coil assembly, and FIG. 9 is a bottom view of the overhead wire. 10A, 10B...Groove, 11...Yoke, 12
... Permanent magnet piece, 13 ... Catenary wire, 13A ... Bending part, 14 ... Rail piece, 15 ... End cover, 1
6... Moving coil assembly, 16A, 16B... Moving coil, 16D... Bent part, 17... Housing, 17A... Housing end surface, 17B... Top plate part, 17C... Side plate part, 18, 18A ,18B...
...Electric brush.

Claims (1)

[Claims for Utility Model Registration] (1) On the inner surfaces of opposing yokes, flat permanent magnet pieces magnetized in the thickness direction are arranged so that the opposite polarities are different and the adjacent polarities are different. A stator disposed in the longitudinal direction with an interval equal to the width of the magnet pieces and a stator that can move in a direction perpendicular to the magnetic flux in the gap between the magnet pieces, and has a thickness of the winding portion and air core portion. a moving coil assembly in which a plurality of moving coils whose width is the same as the width of the magnet piece are combined in a manner shifted by the width of the magnet piece in the longitudinal direction, and a bending portion is provided at the top and bottom; A top plate portion having a current collecting brush connected to the terminal of the moving coil attached to the upper part of the moving coil assembly, and a groove for holding an overhead wire having a desired power distribution pattern and in contact with the current collecting brush. and a side plate portion provided with a groove for holding the yoke on which the magnet piece is arranged and a side plate portion provided with a rail piece that covers the upper and lower sides of the magnet piece. Coil type linear motor. (2) The housing is made of an extruded aluminum or resin material, and the overhead wire is made of a flexible printed circuit board, and the overhead wire has a bent portion at one end, and this bent portion connects one end surface of the housing to the end surface. The other end of the overhead wire is inserted and held in the groove provided in the top plate part, and the yoke is inserted and held in the groove provided in the both side plate parts, and the other end of the overhead wire is held in the groove provided in the top plate part. The moving coil type linear motor according to claim 1, wherein the moving coil type linear motor is fixed within the housing by the end cover and another end cover fitted to the other end face of the housing.