JP2508613B2 - Linear motor - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a linear motor used for opening and closing a curtain and transporting articles.

[0002]

2. Description of the Related Art Conventionally, as a linear motor of this type, there is the following one having a stator block A and a mover block B, which will be described with reference to FIGS.

The stator block A is a cylindrical guide rail.
1, a plate-shaped permanent magnet 2 magnetized in the plate thickness direction so that the longitudinal direction is alternately different poles at regular intervals, and a power supply substrate 3 having a positive and negative voltage conductive portion on one surface. The permanent magnet 2 and the power supply board 3 are fixedly formed along the longitudinal direction of the inner wall of the guide rail 1.

The mover block B has a substantially U-shaped iron core 4a in which coils 4d are wound in opposite directions on opposing pieces 4b, 4c via coil frames, and the iron cores 4a face each other. Piece 4b, 4
An electromagnet device in which three electromagnets 4 each having a permanent magnet 2 interposed in the plate thickness direction between c are arranged in an array 41 made of an insulating material,
Brushes 5 fixed to the outer side of one facing piece 4c of the iron core 4a via an insulating member 5a and connected to the coil 4d, and capacitors (not shown) connected between the brushes 5,
Is formed.

The operation is such that the brush 5 slides on one surface of the power supply board 3 provided with conductive parts of positive and negative voltages, and positive and negative voltages are alternately applied to the coil 4d so that the mover block B extends in the longitudinal direction of the guide rail 1. By moving in the direction, the curtain connected to the mover block B is opened / closed and the article is conveyed.

[0006]

In the conventional linear motor described above, since the capacitors are connected between the brushes 5, one side of the power supply board 3 on which the brushes 5 are provided with conductive parts for positive and negative voltages. Since the sparks generated when the sliding contact is made with the capacitor are absorbed by the condenser, it is possible to prevent the brush 5 and the power supply board 3 from being deteriorated by the sparks.

However, since each brush 5 is not provided with a portion for connecting a condenser, since the condenser is directly connected to the brush 5 by appropriately using a lead wire or the like, it is difficult to perform the mounting work. , The capacitor may be moved or come off during the operation of the mover block B due to unstable fixation of the capacitor, which may hinder the operation.

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 the work of mounting the condenser is easy and which can be stably fixed.

[0009]

In order to solve the above-mentioned problems, a linear motor of the present invention is attached to a cylindrical guide rail in the plate thickness direction so that the longitudinal direction is alternately different poles at regular intervals. A stator block having a magnetized flat plate-shaped permanent magnet and a power feeding substrate provided with a conductive portion for positive and negative voltages, and fixing the permanent magnet and the power feeding substrate along the longitudinal direction of the inner wall of the guide rail. , An electromagnet having a substantially U-shaped iron core in which coils are wound in opposite directions to each other through a coil frame on the opposing piece, and a plate thickness direction of a permanent magnet is interposed between the opposing pieces of the iron core. A plurality of electromagnet devices that are arranged in a row in a body made of an insulating material, a brush that is connected to the coil, and a capacitor that is connected between the brushes, and a mover block, The brush slides in contact with the coil while being biased by the power supply board, and alternates with the coil. In a linear motor in which a mover block moves in the longitudinal direction of a guide rail when a positive or negative voltage is applied, a housing portion for housing the capacitor is provided in the coil frame, and one end of the housing is connected to the capacitor in the housing portion. A conductive plate for electrically connecting the condenser and the brush to each other is provided in the row body.

[0010]

According to the linear motor of the present invention, the coil frame is provided with the accommodating portion for accommodating the condenser, and one end of the accommodating portion is connected to the condenser to electrically connect the condenser and the brush. Since it is installed in the mover block, it can be installed easily by simply connecting it to one end of the conductive plate, and since the capacitor is housed in the housing part, it does not move or come off during operation of the mover block. Therefore, the operation can be stably performed without any trouble in operation.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS. The same members as those in the conventional example are designated by the same reference numerals.

This linear motor comprises a stator block A and a mover block B and is constructed as follows.

First, the stator block A is a guide rail.
1, a permanent magnet 2, and a power supply board 3.

The guide rail 1 is made of a metal material such as aluminum and has both ends opened, and as shown in FIG. 1, a guide groove 1a is provided in the center of the lower side to form a tubular shape having a substantially rectangular cross section.
Further, the inside of the rectangle has a two-stage space vertically divided by a partition 1b having an opening in a part.

The permanent magnet 2 is formed in a flat plate shape, and one end face of the plate thickness thereof is fixed to the center portion of the inner wall of the upper side of the guide rail 1 along the longitudinal direction. Then, as shown in FIG. 6, it is magnetized in the plate thickness direction so that the longitudinal direction is alternately opposite poles at regular intervals. Here, the length of one set of magnet pieces consisting of N pole and S pole in the longitudinal direction is L.

As shown in FIG. 6, the power supply board 3 has a positive voltage conductive part 3b and a negative voltage conductive part 3c on one surface of the flat board at right angles in the vertical direction at regular intervals. It is formed of copper foil so as to be separated into upper and lower parts by the meandering insulating portion 3a. Here, the width of the insulating portion 3a in the longitudinal direction is L
/ 6, the width of the conductive portions 3b and 3c in the longitudinal direction is formed to be L / 3. The power supply board 3 is fixed to the inner wall on one side of the guide rail 1.

Next, the mover block B is composed of three electromagnets.
It is composed of an electromagnet device in which 4 are arranged in a line 41, a brush 5 and a condenser 6.

The electromagnet 4 is a facing piece 4 of a substantially U-shaped iron core 4a.
Coils 4d are formed on b and 4c by winding them in opposite directions via two coil frames 42 and 43, respectively.

One of the two coil frames 42, 43 facing each other
As shown in FIG. 3, the coil frame 43 attached to the 4c is surrounded by a wall on all four sides of the one collar portion 43a and is surrounded by a capacitor.
A housing portion 43c for housing 6 is formed, and in the housing portion 43c, two through holes 43d, 43e penetrating and penetrating between the collar portions 43a, 43b are formed side by side. .

The row body 41 is made of an insulating material such as synthetic resin and is formed in an elongated shape having a substantially U-shaped cross section as shown in FIG. 2, and has an iron core 4a at the center thereof. Three rectangular recesses 41a to be mounted are arranged in a row in the longitudinal direction. And
Two conductive plates 4 are provided on the outer thick portions of the three recesses 41a.
4,45 are set up respectively.

One conductive plate 44 is formed in an L shape by one piece 44a embedded in the row body 41 and the other piece 44b protruding from the row body 41, and one end portion 44c of the other piece 44b and A hole 44d and a hole 44e are provided at the other end, and a notch 44f is provided inside the hole 44d at the one end 44c and near the center thereof. The other conductive plate 45 is composed of a long piece 45a and a short piece protruding from the row body 41.
45b and is formed in a substantially U shape, and its long piece 45a has the same height as the other piece 44b of the conductive plate 44, and its one end 4a.
Similarly to the other piece 44b, the hole 5d and the cutout 45f are provided in 5c, and the hole 45e is provided in the short piece 45b.

Then, as shown in FIG. 2, by using the lead wire shown by the solid line, the central recess 41a among the three recesses 41a is used.
The hole 44e of the conductive plate 44 and the hole 45e of the conductive plate 45 provided in
The holes 45e of the conductive plate 45 and the hole 44e of the conductive plate 44, which are respectively provided in the two recesses 41a at both ends, are respectively connected to the holes 45e of the conductive plate 45 and the holes 44e of the two conductive plates 44 located at both ends, and the hole 45e of the conductive plate 45. Are connected to each other, and by these connections, the respective conductive plates are electrically connected to each other.

As shown in FIG. 2, the brush 5 has a row 41.
Of the conductive plate 44 embedded in the outer thick portion of each recess 41a is fitted in a recess provided to open one surface of one piece 44a of the conductive plate 44, and is urged outward by a spring provided inside, It is electrically connected to the one piece 44a by a lead wire.

The three electromagnets 4 are connected to the opposing pieces 4b, 4
Recesses 41a of the row body 41 so that c are arranged in line.
Be attached to. The procedure at this time is as shown in FIG.
The other piece 44b and the long piece 45a of the two conductive plates 44 and 45 which are erected on the row body 41 are both flange portions 43a and 43b of the coil frame 43 which are fitted and attached to one facing piece 4c of the iron core 4a. Are inserted into through holes 43d and 43e provided in the coil frame 43, and one end portions 44c and 45c of the coil frame 43 project into the accommodating portion 43c provided outside the one flange portion 43a of the coil frame 43. Then, each of the protruding ends is provided with a cutout 44e and a cutout 44e.
The coil frame 43 is bent at the right angle in the same direction at the position of 45e, and the coil frame 43 is prevented from coming off from the facing piece 4c of the iron core 4a. Next, the leads of the capacitor 6 are inserted into the holes 44d and the holes 45d at each end, and then soldered, so that the capacitor 6 is accommodated in the accommodating portion 43c.

As described above, the mover block B is
Coils wound in opposite directions on the opposing pieces 4b, 4c of the iron cores 4a of the three electromagnets 4 through the two coil frames 42, 43.
As shown in FIG. 5, 4d has one end connected to each brush 5, the other end commonly connected, and a capacitor 6 connected between the brushes 5 to form a three-phase electromagnet device. There is. At this time, the length of each electromagnet 4 in the row direction is set not to exceed L / 3, and the interval between the brushes 5 is set to L / 3.

The mover block B is arranged in the upper space of the guide rail 1 by interposing the permanent magnet 2 in the plate thickness direction between the facing pieces 4b and 4c of the iron core 4a.
The brush 5 is slidably in contact with the substantially central portion of one surface of the power supply board 3 while being accommodated in the.

On the other hand, in the lower space of the guide rail 1,
The transfer piece 4e extends from the row body 41 so as to protrude through the opening of the partition wall 1b and the guide groove 1a, and the transfer piece 4e has a roller that rolls along the inner wall of the lower side of the guide rail 1 in the longitudinal direction. It is provided with 4f. Then, an object to be conveyed such as a curtain is connected to the portion of the conveying piece 4e that projects to the outside.

Next, the operation of this linear motor will be described. When the brush 5 is brought into sliding contact with one surface of the power supply board 3, 3
Positive and negative voltages are applied to the coil 4d so that current always flows in any two phases of the phase coils 4d. For example, when the two electromagnets 4 at both ends are excited and in the state of FIG. 6, the opposing pieces 4b, 4c of the iron core 4a, which are the magnetic poles of the electromagnet 4, are formed.
The movable block B in the direction of arrow L / 6 by the propulsive force due to the attraction and repulsion between the magnetic pole surface of
Progresses. Then, this time, the sliding contact position of the brush 5 with respect to the power supply board 3 is changed, the two electromagnets 4 at the rear end are excited, and subsequently the same action further advances by L / 6. After that, the L / 6 progresses continuously, and L / 6 becomes 6
The process proceeds once and returns to the state of FIG. In this way, the mover block B advances in the longitudinal direction of the guide rail 1. When moving the mover block B in the reverse direction, the positive and negative voltages of the conductive portions 3b and 3c of the power supply substrate 3 may be reversed. Further, if the mover blocks B are connected by an integral multiple, the carrying force increases substantially in proportion to the number of connections.

Further, the brush 5 is a conductive portion 3b, 3c of positive and negative voltage.
Sparks generated when sliding on one surface of the power supply board 3 provided with are absorbed by the capacitors 6 connected between the brushes 5 and prevent the brushes 5 and the power supply board 3 from being deteriorated by the sparks. .

In such a linear motor, the coil frame 43 mounted on one of the facing pieces 4c of the iron core 4a is provided with the accommodating portions 43c surrounded by walls on all sides, and the accommodating portions 43c each have an accommodating portion 43c. Since the end plates 44c, 45c are connected to the condenser 6 and the conductive plates 44, 45 for electrically connecting the condenser 6 and the brush 5 are provided in the row body 41, the mounting work of the condenser 6 is performed by the conductive plates 44, 45. This can be easily done by soldering to the one ends 44c and 45c, and since the capacitor 6 is housed in the housing part 43c, it can be moved or removed during movement of the mover block B to operate. It will be stable and can be fixed without any problems.

[0031]

According to the linear motor of the present invention, the coil frame is provided with an accommodating portion for accommodating the condenser, and one end of the accommodating portion is connected to the condenser to electrically connect the condenser and the brush. Since it is installed in the mover block, it can be installed easily by simply connecting it to one end of the conductive plate, and since the capacitor is housed in the housing part, it does not move or come off during operation of the mover block. Therefore, the operation can be stably performed without any trouble in operation.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention.

FIG. 2 is a perspective view showing the same row arrangement body.

FIG. 3 is a perspective view showing a coil frame of the same.

FIG. 4 is a partial perspective view showing a state in which a condenser is housed in the above coil frame.

FIG. 5 is a circuit diagram showing a connection state of the coil, the brush, and the condenser of the above.

FIG. 6 is an explanatory diagram showing an operation state of the above.

FIG. 7 is a perspective view showing a mover block of a conventional example.

FIG. 8 is an overall sectional view of the above.

[Explanation of symbols]

 A Stator block 1 Guide rail 2 Permanent magnet 3 Power supply board 3b Positive voltage conductive part 3c Negative voltage conductive part B Movable block 4 Electromagnet 4a Iron core 4b Opposing piece 4c Opposing piece 4d Coil 41 Row assembly 42 Coil frame 43 Coil frame 43c Housing 44 Conductive plate 44c One end 45 Conductive plate 45c One end 5 Brush 6 Capacitor

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Norihi Shiraiwa 1048 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Works, Ltd. (56) Reference JP-A-3-139189 (JP, A) JP-A-1-259745 (JP, A) Actual opening 57-195378 (JP, U) Actual opening Flat 1-103385 (JP, U) Actual opening 61-52492 (JP, U)

Claims (1)

(57) [Claims] 1. A power supply board provided with a tubular guide rail, a plate-shaped permanent magnet magnetized in the plate thickness direction so that the longitudinal direction alternates with different poles at regular intervals, and a conductive portion of positive and negative voltages. And a stator block having a permanent magnet and a power supply board fixed along the longitudinal direction of the inner wall of the guide rail,
A plurality of electromagnets each having a substantially U-shaped iron core in which a coil is wound around the facing piece in opposite directions through a coil frame, and a permanent magnet is interposed between the facing pieces of the iron core in the plate thickness direction. A brush is provided with a mover block having electromagnet devices, each of which is arranged in a row by an insulating member, a brush connected to a coil, and a capacitor connected between the brushes. In the linear motor in which the mover block moves in the longitudinal direction of the guide rail by slidingly contacting the coil while being biased by the power feeding substrate and alternately applying positive and negative voltages to the coil, the coil frame accommodates the capacitor. A linear motor, characterized in that a conductor plate is provided in the housing portion, one end of which is connected to the condenser to electrically connect the condenser to the brush.