JP3590166B2 - Linear motor - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a linear motor used for conveying curtains, doors, and the like.
[0002]
[Prior art]
Recently, a linear motor has been used as a transport device such as a curtain. As this type of linear motor, the one shown in FIG. 8 is known. This linear motor is a three-phase driven movable coil type having a stator block 1 and a mover block 5 as main components.
[0003]
The stator block 1 has a generally long cylindrical shape including opposed side walls 2c and 2d and a lower wall 2b having an opening 2h extending in the longitudinal direction and substantially parallel to both ends 2i and 2j. A stator case 2 and permanent magnets which are magnetized to have different poles in the thickness direction and which are magnetized so that different poles are present alternately at regular intervals in the longitudinal direction and arranged in the stator case 2 3, a long and flat power supply board 4 on which positive and negative conductive portions and insulating portions are formed at predetermined intervals in the longitudinal direction, and an isolation member 20 for separating the stator case 2 into two rooms. I have.
[0004]
The mover block 5 is wound around the yoke 8 and the opposing pieces 8a, 8b, each of which has a substantially U-shape formed by the opposing pieces 8a, 8b and the connecting piece 8c, and the opposing pieces 8a, 8b are positioned so as to sandwich the permanent magnet 3. And a brush 11 for supplying positive and negative voltages of the power supply board 4 to the coil, and an electromagnet device 6 comprising a stator case Roller 13 that is slidably movable along line 2, and a conveyed object holder 14 that is connected to electromagnet device 6 and protrudes below opening 2 h of stator case 2 and holds an object to be conveyed such as a curtain. And
[0005]
This linear motor causes an electric current to flow through the coil 9 of the mover block 5 through the brush 11, thereby causing an electromagnetic attraction and repulsion between the permanent magnet 3 of the stator block 1 and the electromagnet device 6 of the mover block 5. Accordingly, the mover block 5 is driven in a fixed direction.
[0006]
[Problems to be solved by the invention]
In the above-described linear motor, since the mover block is smoothly driven in a fixed direction, the driving noise is small and the traveling property is good. By the way, when this linear motor is installed in a room that requires light-shielding properties, it is necessary to prevent a gap from being formed between a transferred object such as a curtain and the stator case. At that time, the transferred object may come into contact with the stator case, and the sliding resistance between the transferred object and the stator case may increase, and the transfer capability of the linear motor may decrease.
[0007]
The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a linear motor in which a transfer capability is prevented from being reduced by an object to be transferred.
[0008]
[Means for Solving the Problems]
In order to solve this problem, a linear motor according to claim 1 is provided with a substantially long cylinder having opposed side walls and a lower wall having openings substantially parallel to both ends and extending in a longitudinal direction. A stator case formed in a shape, and magnetized with different poles in the thickness direction, and magnetized so that different poles are present alternately at regular intervals in the longitudinal direction and disposed in the stator case. A stator block having a permanent magnet, a long flat plate-shaped power supply substrate on which positive and negative conductive portions and an insulating portion are formed at predetermined intervals in the longitudinal direction, and a substantially U-shape formed by a facing piece and a connecting piece. None An electromagnet device supported on the stator case in a movable state having a yoke in which the opposing piece sandwiches the permanent magnet and a coil wound on the opposing piece, and positive and negative voltages of the power supply board The brush that supplies the coil to the coil and the electromagnet device A roller that is slidably movable along a shaft, and a conveyed object holder that is connected to the electromagnet device and that protrudes downward from an opening of the stator case and holds a substantially planar object such as a curtain or a door. And a mover block having a movable member block having an upper end portion of the object to be transported through the opening in the lower wall of the stator case without strongly contacting the stator case. At least one of the lower walls is disposed adjacent to an end of the lower wall, and an end of the lower wall adjacent to the opening is substantially parallel to and inward of the side wall on the side of the end. A first connecting wall connecting the first connecting wall and the side wall, and a second connecting wall substantially parallel to the lower wall is provided, and the first connecting wall and the second connecting wall are provided. In the stator case, a concave space for accommodating the upper end of the transferred object It has been the formation and configuration.
[0009]
Further, a linear motor according to a second aspect is configured such that the power supply board according to the first aspect is provided on a side of a side wall connected to the second connection wall .
[0010]
According to a third aspect of the present invention, in the linear motor according to the second aspect, a receiving portion disposed on the side of the first connecting wall and protruding upward so as to store brush powder by the brush is provided on the second connecting wall. It has a configuration.
[0011]
A linear motor according to a fourth aspect has a configuration in which the transported object holder according to the first to third aspects is disposed so as to be located directly below the electromagnet device .
[001 2 ]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a cross-sectional view of a linear motor, and the same names are used for members and portions having the same basic functions as those of the conventional example.
[001 3 ]
Reference numeral 1 denotes a stator block having a stator case 2, a permanent magnet 3, and a power supply board 4.
[001 4 ]
As shown in FIG. 1, the stator case 2 is provided with the permanent magnet 3 and the power supply board 4 and is formed by extrusion molding of aluminum or the like in order to support a movable block described later in a movable state. It is formed in a substantially long cylindrical shape having a sectional shape. The stator case 2 has an upper wall 2a, a lower wall 2b, a first side wall 2c, a second side wall 2d, a first connecting wall 2e, and a second connecting wall 2f, and has a substantially rectangular cross section, and the inside thereof is movable. It is a child block accommodation room. The first side wall 2c, the second side wall 2d, and the first connecting wall 2e are disposed in parallel with each other, and the first connecting wall 2e is located inside the second side wall 2d. The upper wall 2a, the lower wall 2b, and the second connecting wall 2f are also arranged in parallel with each other, and the second connecting wall 2f is located inside the lower wall 2b. Therefore, the first connection wall 2e and the second connection wall 2f form a concave space on the lower right side outside the stator case 2.
[001 5 ]
The second connecting wall 2f has a receiving portion 2g protruding upward on the side of the first connecting wall 2e. The receiving portion 2g acts to store brush powder of a brush described later. The lower wall 2b has an opening 2h extending in the longitudinal direction, and the opening 2h is parallel to the ends 2i, 2j of the lower wall 2b, and the end 2j, that is, the first end 2j. It is arranged so as to be adjacent to the connecting wall 2e.
[001 6 ]
Further, an I-shaped support portion 2k for supporting the permanent magnet 3 is formed at the center of the inner surface of the upper wall 2a, and a substantially L-shaped second support portion 2m for supporting the power supply board 4 is formed on the second side wall 2d. 2n, 2n are support projections for attaching the stator case 2 to a bracket (not shown).
[001 7 ]
The permanent magnet 3 is a plate-shaped magnet that is magnetized with different poles in the thickness direction and is magnetized so that different poles are present alternately at regular intervals in the longitudinal direction. It has a corresponding supporting recess 3k. In this permanent magnet 3, by fixing the supporting concave portion 3k and the supporting portion 2k by appropriate means such as press-fitting or bonding, different poles are present alternately over almost the entire length of the stator case 2.
[001 8]
The power supply substrate 4 is formed with positive and negative conductive portions 4 a and 4 b and an insulating portion 4 c at predetermined intervals in the longitudinal direction, and is fixedly disposed on the second support portion 2 m of the stator case 2. That is, as shown in FIG. 4, the power supply substrate 4 is provided with the positive and negative conductive portions 4a and 4b by forming a conductive pattern having a constant thickness on one surface of the insulating substrate. The insulating portion 4c is formed in such a manner that a portion where no conductive pattern exists results in separating the positive and negative conductive portions 4a and 4b. The positive and negative conductive portions 4a and 4b and the insulating portion 4c are formed at predetermined intervals in the longitudinal direction so that brushes of the mover block described later can slide. A positive voltage is applied to the coil of the mover block when the brush is in contact with the positive conductive portion 4a, and a negative voltage is applied when the brush is in contact with the negative conductive portion 4b. There is a step between the positive conductive part 4a and the insulating part 4c, and between the negative conductive part 4b and the insulating part 4c. The brush slides on the step and the positive and negative conductive parts 4a. A land 4d is provided on the insulating portion 4c located between the portions 4b, and is formed so as to control mechanical wear of the brush.
[00 19 ]
Reference numeral 5 denotes a mover block, which mainly includes an electromagnet device 6, a brush 11, a roller 13, and an article holder 14. Further, as shown in FIG. 2, this linear motor has three electromagnet devices 6, 6, 6 and brushes 11, 11, 11 for three-phase driving. Is formed. This type is suitable for curve running because it can be bent for each of the electromagnet devices 6, 6, and 6.
[002 0]
Each electromagnet device 6 includes a movable table 7 made of resin, a laminated yoke 8, and a coil 9 wound around the yoke 8. The movable base 7 has a substantially flat plate shape, has a connecting portion 7 a for connecting to an end in the longitudinal direction, connects the respective electromagnet devices 6, and slides inside the stator case 2. On the lower surface 7b of the movable base 7, a substantially L-shaped hook 7c for fixing a transported object holder 14 described later is attached.
[002 1 ]
The yoke 8 is formed in a substantially U-shape by a laminated iron core having a substantially U-shape formed by the opposing pieces 8a and 8b and the connecting piece 8c, and the connecting pieces are arranged so that the opposing pieces 8a and 8b face each other so as to sandwich the permanent magnet 3. 8 c is embedded and fixed in the movable base 7.
[002 2]
The coil 9 is wound around coil frames 9a, 9a mounted on the opposing pieces 8a, 8b, and three sets of coils 9, 9, 9 for each yoke 8, 8, 8 are connected to each terminal. Are commonly connected, and the other is separately connected to three brushes 11, 11, 11 described later.
[002 3 ]
Further, as described above, the three electromagnet devices 6, 6, 6 are arranged side by side in the longitudinal direction of the stator case 2 by connecting and connecting the three movable tables 7, 7, 7 together. In that case, the length in the longitudinal direction of each electromagnet device 6 is set so as not to exceed L / 3, where L is the length of the pair of N pole and S pole of the permanent magnet 3. Therefore, the length in the longitudinal direction of the yoke 8 is set sufficiently smaller than L / 3 in consideration of the dimensions of the coil 9.
[002 4 ]
The brush 11 has a rectangular parallelepiped shape, and is fixed to a distal end of a conductive spring 11 a having a base end fixed to the movable base 7 so as to be in sliding contact with the power supply board 4. The brush 11 is electrically connected to the other terminal of each coil 9 via a conductive spring 11a so as to supply the positive and negative voltages of the power supply substrate 4 to the coil 9. In addition, each brush 11 is set so that the interval is L / 3.
[002 5]
The roller 13 facilitates sliding of the mover block 5 along the stator case 2, and is supported by roller shafts 15, 15 rotatably held by a conveyed object holder 14, which will be described later, and is fixed. The child case 2 is held slidably on the lower wall 2b and the like.
[002 6 ]
The conveyed object holder 14 holds a curtain as an object to be conveyed, and is formed in a substantially flat plate shape as shown in FIG. The transferred object holder 14 includes a hook locking hole 14a for locking the mover hook 7c, transferred object locking holes 14b, 14b for locking the transferred object, and a roller shaft 15 for supporting the roller 13. , 15, and 15. Further, the conveyed object holder 14 is disposed so as to protrude below the opening 2 h of the stator case 2, and the roller shafts 15, 15 have their axial directions parallel to the connecting pieces 8 c of the yoke 8. Will be arranged.
[002 7 ]
FIG. 6 shows a state in which the curtain 16 which is the transported object is held by the transported object holder 14. One end 17 a of the substantially S-shaped curtain hook 17 is connected to the transported object of the transported object holder 14. The other end 17b is inserted into the curtain 16 in the locking hole 14b.
[002 8 ]
Such a linear motor passes a current through at least two of the three coils 9, 9, 9 of the mover block 5 through the brushes 11, 11, 11, and the resulting permanent magnet 3 of the stator block 1. The mover block 5 is driven in a fixed direction by the electromagnetic attraction and repulsion between the mover block 5 and the electromagnet device 6 of the mover block 5. When the driving (running) direction of the mover block 5 is reversed, the polarity of the voltage supplied to the positive and negative conductive portions 4a and 4b may be reversed.
[00 29 ]
As shown in FIG. 6, the opening 2h is provided at an end of at least one lower wall 2b such that the upper end of the curtain 16 corresponding to the object to be conveyed is transported without strongly contacting the stator case 2. It is arranged at a position adjacent to the portion 2j. That is, since the opening 2h is adjacent to the end 2j of the lower wall 2b, and the upper part of the curtain 16 which is the transported object is accommodated in the space surrounded by the first connecting wall 2e and the second connecting wall 2f, the curtain 16 is used. Since the curtain 16 does not easily come into contact with the stator case 2 while maintaining the light-shielding property of the room, it is difficult to increase the sliding resistance, and it is difficult to reduce the transfer capacity. An end 2j adjacent to the opening 2h of the lower wall 2b has a first side which is substantially parallel to the inside of the side wall (the second side wall 2d) on the side of the end 2j and the side wall and is connected to the end 2j. A connecting wall 2e is provided, and a second connecting wall 2f that connects the first connecting wall 2e and the second side wall 2d and is substantially parallel to the lower wall 2b is provided. Therefore, since a part of the curtain 16 can be accommodated in the space, the appearance is improved, and the connection between the linear motor and the curtain 16 can be made compact.
[003 0]
Further, brush powder generated when the brush 11 slides on the power supply substrate 4 is accumulated between the second side wall 2d on the second connecting wall 2f and the receiving portion 2g, and thus falls down and the roller 13 The transfer resistance is hardly reduced, and there is almost no possibility that the brush powder will fall further and contaminate the transferred object such as the curtain 16, so that the reliability is improved.
[003 1 ]
Further, even if a driver or the like is inserted through the opening 2h of the lower wall 2b, the driver does not come into direct contact with the power supply board 4, thereby ensuring safety against electric shock and eliminating the need for a special isolation member as in the related art. It becomes.
[003 2 ]
Next, a second embodiment of the present invention will be described with reference to FIG. This is different from the first embodiment in the mounting structure of the transported object holder and the like.
[003 3 ]
As shown in FIG. 7, the stator case 2 is formed to have a substantially symmetrical cross section. That is, reference numeral 2p denotes a third connecting wall, which is disposed so as to be parallel to the first connecting wall 2e, and is located inside the first side wall 2c. Reference numeral 2q denotes a fourth connecting wall, which is formed so as to be substantially straight with the second connecting wall 2f, and is located inside the lower wall 2b. Therefore, the third connecting wall 2p and the fourth connecting wall 2q form a concave space on the lower left side outside the stator case 2.
[003 4 ]
Further, the hook 7c is formed in a flat plate shape, is disposed directly below the electromagnet device 6, and connects the electromagnet device 6 and the conveyed object holder 14. The hook 7c is attached to the movable base 7
The three members are united by press-fitting into the conveyed object holder 14.
[003 5 ]
In this case, since the transported object holder 14 is located directly below the electromagnet device 6, the driving force of the electromagnet device 6 is effectively transmitted to the transported object holder 14, so that the loss of the driving force transmission is small, and the performance is improved. Since the force in the oblique direction is hardly applied to the mover block 5 and the like, the reliability is further improved.
[003 6 ]
Although the first connection wall and the second connection wall form a concave space in the first embodiment, the first connection wall and the second connection wall are connected by connecting the opening of the lower wall to one of the side walls. Can be eliminated. Further, the space formed by the first connection wall and the second connection wall or the space formed by the third connection wall and the fourth connection wall is not necessarily required to be rectangular, and may be formed in an arc shape in some cases. .
[003 7 ]
【The invention's effect】
In the linear motor according to the first aspect, since the opening is adjacent to the end of the lower wall, a substantially planar object such as a curtain or a door is held by the object holder, and is located above the lower wall. However, since the transferred object is hard to contact the side wall and the like of the stator case even when it is located at the position, it is difficult to increase the sliding resistance and the transfer capability is hardly reduced. In addition, since a part of the transferred object can be accommodated in the space surrounded by the first connecting wall and the second connecting wall, the appearance is improved and the size can be reduced.
[00 38]
Further, in the linear motor according to the second aspect , in addition to the effect of the first aspect , the brush powder generated by the sliding of the power supply board and the brush accumulates on the second connecting wall, so that the rotation of the roller is reduced. The transfer capacity is not easily reduced without causing sliding resistance, and there is almost no possibility that the brush powder will fall and contaminate the transferred object or the like, and the reliability is improved.
[00 39]
Further, in the linear motor according to the third aspect , in addition to the effect of the second aspect , since the brush powder is more reliably collected on the second connecting wall at the receiving portion, it hardly falls down, and Reliability is improved.
[004 0 ]
In addition, in the linear motor according to the fourth aspect, in addition to the effect of any one of the first to third aspects, the driving force of the electromagnet device is effectively transmitted to the conveyed object holder, so that the loss of the driving force transmission is small and the performance is reduced. Is improved, and since a force in an oblique direction is hardly applied to the mover block and the like, the reliability is further improved.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a linear motor according to a first embodiment of the present invention.
FIG. 2 is a perspective view of the electromagnet device.
FIG. 3 is a perspective view of the permanent magnet.
FIG. 4 is a plan view of the power supply board.
FIG. 5 is a side view of the transported object holder.
FIG. 6 is a cross-sectional view of the linear motor when the conveyed object holder holds a curtain as an object to be conveyed.
FIG. 7 is a sectional view of a linear motor according to a second embodiment of the present invention.
FIG. 8 is a sectional view of a linear motor showing a conventional embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Stator block 2 Stator case 2a Upper wall 2b Lower wall 2c 1st side wall 2d 2nd side wall 2e 1st connection wall 2f 2nd connection wall 2g Receiving part 2h Opening 3 Permanent magnet 4 Power supply board 5 Mover block 6 Electromagnet Apparatus 7 Movable table 7c Hook 8 Yoke 9 Coil 11 Brush 13 Roller 14 Conveyed object holder 16 Curtain (conveyed object)
17 Curtain hook

Claims (4)

A stator case formed in a substantially elongated cylindrical shape having opposing side walls and a lower wall having openings substantially parallel to both ends and extending in a longitudinal direction; Permanent magnets that are magnetized and are magnetized so that different poles are present alternately at regular intervals in the longitudinal direction, and are disposed in the stator case. A stator block having a long flat plate-shaped power supply substrate on which a portion is formed,
The opposing piece and the connecting piece have a substantially U-shape. The opposing piece has a yoke positioned so as to sandwich the permanent magnet and a coil wound on the opposing piece and is supported by the stator case in a movable state. And a brush that supplies positive and negative voltages of the power supply board to the coil, a roller that rotates so that the electromagnet device can slide along the stator case, and a stator case that is connected to the electromagnet device. In a linear motor, comprising: a mover block that projects downward from an opening and holds a substantially planar object such as a curtain or a door;
An opening in the lower wall of the stator case is disposed at a position adjacent to an end of at least one lower wall so that the upper end of the transferred object is conveyed without strongly contacting the stator case. An end portion adjacent to the opening portion of the lower wall, a first connection wall which is substantially parallel to the inside of the side wall on the side of the end portion and the side wall and is connected to the end portion; And a second connecting wall substantially parallel to the lower wall, and the first connecting wall and the second connecting wall accommodate the upper end of the transferred object in the stator case. A linear motor, wherein a concave space is formed . The linear motor according to claim 1, wherein the power supply board is provided on a side of a side wall connected to the second connection wall. 3. The linear motor according to claim 2, wherein a receiving portion disposed on the side of the first connecting wall and protruding upward so as to accumulate brush powder by the brush is provided on the second connecting wall . The conveyed object holder is disposed so as to be located directly below the electromagnet device. 4. The linear motor according to claim 1, wherein

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