JPH0139116Y2 - - Google Patents

Description

[Detailed Description of the Invention] "Industrial Application Field" This invention relates to a moving coil type linear motor that can be used for any other purpose in addition to driving various accessories of an automobile body.

"Prior Art" Conventional moving coil type linear motors generally have permanent magnets placed on both sides of the moving coil, and because the magnets are on both sides of the moving coil, the problem is that the overall cross-sectional shape becomes large. be.

However, JP-A-57-113767 discloses a linear motor in which a moving coil is supported on the upper surface of one side of a plurality of magnets via an air bearing, and a magnet is arranged only on one side of the moving coil. However, since it requires an air bearing, there are problems in that the structure is complicated and the cross-sectional shape is large.

In addition, in conventional moving coil type linear motors, in order to switch the direction of current in the moving coil, a magnetic sensor that detects the polarity of magnetic flux is attached to the moving coil, and an electronic switching circuit is connected to this sensor via a conductive wire. Since the current direction is switched by moving the coil, it requires a magnetic sensor and an electronic switching circuit with a complicated configuration, which is expensive, and also requires the inconvenience of routing the conductor that moves along with the moving coil. be.

``Problems that the invention attempts to solve'' This invention was created in view of the above problems, and it has a small cross-sectional shape and requires connection and routing of conductors with magnetic sensors and electronic switching circuits. The purpose of the present invention is to provide a moving coil type linear motor that does not

``Means for Solving the Problems'' The moving coil linear motor of this invention consists of a rail with an inverted U-shaped cross section made of non-magnetic material, and a pair of rails arranged facing each other on both sides of the inner surface of the rail. a yoke, and a plurality of permanent magnets arranged in the longitudinal direction of one of the yokes so that adjacent ones facing the other yoke have different polarities, and which pass magnetic flux through the gap between the yoke and the other yoke. and a moving coil assembly capable of moving within the air gap in a direction perpendicular to the magnetic flux guided by a rail and a permanent magnet, the moving coil assembly including a plurality of moving coils and a winding of the moving coil. A moving coil assembly in which the winding direction of the wire portion is perpendicular to the magnetic flux, and a current collecting brush provided on the upper part of the moving coil assembly and connected to the winding end of each moving coil, and contactable with the current collecting brush. includes positive and negative conductors disposed on the inner upper surface of the rail, and each movable coil is configured such that the movable coil assembly generates a thrust in the moving direction depending on the relative position of the movable coil assembly and the permanent magnet. The present invention is characterized in that it includes a power supply pattern that supplies power to each movable coil while switching the direction of a flowing current, and that at least one of the plurality of movable coils is always driven.

"Operation" According to the above configuration, the moving coil is energized while switching the direction of current through the power feeding pattern arranged on the upper surface of the rail and the current collecting brush provided on the upper part of the moving coil assembly. It is possible to switch and supply current to each moving coil that is appropriate for the direction of movement and the direction of magnetic flux, eliminating the need for connecting and routing conductors to magnetic sensors and electronic switching circuits, and allowing moving coil assemblies to be connected to rails and permanent wires. Since the magnets guide the movement in a direction perpendicular to the magnetic flux, there is no need for an air bear rig, and since the permanent magnet is placed on either one of the yokes, that is, on one side of the moving coil assembly, the cross-sectional shape of the linear motor is small. becomes.

Furthermore, according to this invention, a current collecting brush is provided on the upper part of the moving coil assembly, and a power feeding pattern is arranged on the upper surface of the rail to energize the current collecting brush, and the winding portion of each moving coil is Since there are no current collecting brushes or feeding patterns in the air gap perpendicular to the air gap, the width of this air gap is narrower, and the density of the magnetic flux acting on each moving coil can be increased, thereby increasing the thrust of the moving coil assembly. .

``Background of the invention'' The applicant for utility model registration related to this invention previously proposed an inverted U-shaped cross section made of non-magnetic material in order to solve the problems of the above-mentioned prior art as Utility Model Application No. 59-71491. a rail, a pair of yokes arranged opposite to each other on both sides of the inner surface of the rail, and arranged longitudinally on one of the yokes so that adjacent ones facing the other yoke have different polarities,
A moving coil assembly including a plurality of permanent magnets that conduct magnetic flux through a gap with the other yoke, and a moving coil assembly capable of moving within the gap in a direction perpendicular to the magnetic flux while being guided by a rail and the permanent magnets. A moving coil assembly in which a solid body includes a plurality of moving coils having an air core portion at the center, and the winding direction of the winding portion of the moving coil is perpendicular to the magnetic flux, and a moving coil center in the moving coil assembly. A current collecting brush provided in an air core portion of the movable coil and connected to a winding end of each moving coil, and a positive and negative conductor disposed on a side surface of the other yoke within the rail so as to be able to contact the current collecting brush. , a power supply that supplies power to each moving coil while switching the direction of the current flowing through each moving coil so that the moving coil assembly generates thrust in the moving direction according to the relative position between the moving coil assembly and the permanent magnet; We have devised a moving coil type linear motor which is equipped with a pattern and in which at least one of a plurality of moving coils is always driven.

This invention is an improvement on the previous invention with the above-mentioned configuration by further specifying the arrangement positions of the brushes and the power supply pattern, and aims at improving the thrust force.

"Example" Next, an example of this invention will be described based on the drawings.

Fig. 1 is a perspective view of essential parts showing an embodiment of the moving coil type linear motor of this invention, Fig. 2 is a side view of the moving coil assembly, and Fig. 3 is a perspective view showing the arrangement of the permanent magnets and the moving coil assembly. This figure also shows the principle of thrust generation according to Fleming's left-hand rule. FIGS. 4a, 4b, and 4c are sectional views and bottom views showing the relationship between the current flow of the moving coil assembly and the magnet and power supply pattern in the operating state.

In FIGS. 1 to 4, 1 is a rail having an inverted U-shaped cross section made of non-magnetic material,
A flat permanent magnet 3 is held on the inner surface of one side of the rail 1 by a magnet holding portion 2 having a U-shaped cross section, and is magnetized in the thickness direction and arranged so that adjacent magnetic poles have different polarities. There is. Inside the rail 1, a moving coil assembly including a pair of moving coils 5 and 5' whose upper and lower ends are bent and have a U-shaped cross section is supported by a permanent magnet 3 via a magnet holding part 2. These moving coils 5, 5' are guided by a permanent magnet 3 and are movable. The pair of moving coils 5 and 5' each have a length 1.5 times the magnetic pole of the magnet 3, and have a space in the center that is 0.5 times the length of the axial pole of the magnet 3. Being faced with. At the top of the movable coils 5, 5' in the movable coil assembly, current collecting brushes 6A, 6B connected to the winding ends of the respective coils are provided.
A and 6B are the trajectory T of the brush as shown in Fig. 4c.
are arranged in a row so that there is one row. A power supply pattern 7 is arranged at the upper end of the inner surface of the rail 1. Positive and negative conductors 7A and 7B of this power supply pattern 7
The brushes 6A and 6B in a row are alternately intertwined so as to switch and contact each other, and the positive conductor 7
The length of the interlocking part between A and the negative conductor 7B is approximately slightly shorter than the length of the magnetic pole of the permanent magnet 3, and a slightly longer insulating part 7 is provided at the joint where the magnetic polarity changes.
C is interposed. The distance between the contact parts of the current collector brushes 6A and 6B with the positive and negative conductors 7A and 7B is set slightly longer than 0.5 times the magnetic pole of the magnet 3,
While the effective winding portions of one or both of the coils 5' are completely included in the magnetic flux in the same direction by the magnet 3, the moving coils 5, 5', which are included in the magnetic flux in the same direction, are supplied from the power supply pattern 7. The brushes 6A and/or 6B of the movable coils 5, 5' are energized. On one side of the rail 1, a flat plate-shaped yoke 4A is fitted between the permanent magnet 3, and on the other side of the rail 1, a movable coil 5,
5' and a small gap, the fitting portions 41 are inserted at both the upper and lower ends.
A yoke 4B having a cross-sectional shape forming a protruding surface 42B is fitted between the yoke 4B.

"Operation" In the above configuration, first, the operating principle of the moving coil type linear motor of this embodiment will be explained. As shown in FIG. 3, when the movable coil 5' is energized via the current collector brush 6B, a current I flows through the right effective winding section from top to bottom and through the left effective winding section from bottom to top.
flows, and according to the polarity N and S of the magnetic poles of the magnet 3, a magnetic flux φ from the front toward the page acts on the effective winding section on the right side as shown in the figure, and a magnetic flux toward the front from the page surface acts on the effective winding section on the left side. When φ works, the moving coil 5'
According to Fleming's left-hand rule, a force F is generated in the current I flowing through the left and right effective windings in a direction perpendicular to the current I and the magnetic flux φ toward the right in the figure. Since the movable coil 5' moves to the right in the figure, the magnet 3
When the current I is sequentially switched in accordance with the polarities N and S of the magnetic poles, the moving coil 5' is intermittently subjected to a force F directed to the right in the figure, and moves linearly. The above is the operating principle of a linear motor. The other movable coil 5 of the pair is also alternately and intermittently energized in the same manner as the movable coil 5' at a position 1.5 pitches ahead in terms of magnetic pole length, and a force F directed to the right in the figure is generated.

Next, operation with a simplified power supply pattern, which is one of the features of this invention, will be explained using FIG. 4.

As illustrated in FIG. As indicated by the circles on the locus T shown in FIG.
In order to simultaneously energize both terminals 5' in opposite directions for a short period of time,
All together, you will get thrust to the right.

In addition, when only one moving coil 5' of the moving coil assembly has its effective winding part within the magnetic flux of the same polarity as shown in FIG. 4b, the trajectory T shown in FIG. Current collector brush 6 as shown by the cross mark on the left side
Both ends of B are the positive and negative conductors 7A and 7B of the power supply pattern 7
Climb on top and energize only the moving coil 5' to obtain a rightward thrust in the figure. At that time, the other moving coil 5
If the effective winding part is located at a position where the polarity of the magnetic flux changes as shown in FIG. The other movable coil 5 is shot with the same polarity and is not energized.

The moving coil assembly of this embodiment includes a moving coil 5,
Since two moving coils 5' are arranged in a pair, the two moving coils 5, 5' are alternately energized so that at least one of the two moving coils is always driven.
The moving coil assembly continues to move in the same direction. When moving the moving coil assembly including moving coils 5 and 5' in the opposite direction, the polarity of the voltage applied to the positive and negative conductors 7A and 7B of the power supply pattern 7 must be reversed. You should do it.

According to the above embodiment, firstly, the movable coils 5, 5' of the movable coil assembly are connected to the upper current collecting brushes 6A, 6B and the power feeding pattern 7 at the upper end of the rail 1.
Since power is supplied at the upper end of the movable coils 5, 5', the air gap between the side surfaces of the movable coils 5, 5' and the yokes 4A, 4B can be reduced, and the magnetic flux density applied to the movable coils 5, 5' by the magnet 3 can be increased. There is an advantage that the thrust of the moving coil type linear motor can be increased. Furthermore, secondly, brushes 6A and 6B provided in a row at the upper ends of the movable coils 5 and 5' of the movable coil assembly are used to control the movable coils 5 and 5'.
By making it possible to supply power, the locus T of the current collecting brushes 6A and 6B becomes one line. Therefore, the shape of the positive and negative conductors 7A and 7B of the power supply pattern 7 differs from the previous application in which the brush locus was made into two lines ( Jitsugan 59-71491
The embodiment of this invention is simplified compared to the embodiment of the previous application, in which the positive and negative conductors were branched into a maximum of four branches, but in the embodiment of this invention, the two conductors are alternately branched. Since the widths of the positive and negative conductors 7A and 7B are widened, the resistance of these conductors 7A and 7B is reduced, and the current collection brushes 6A and 6B are connected from the power feeding point to the power feeding pattern 7.
Even if the moving coils 5, 5' move away from each other, the voltage applied to the moving coils 5, 5' does not decrease, and in this respect as well, there is an advantage that the thrust of the moving coil type linear motor is improved. Therefore, the film thickness of the positive and negative conductors 7A and 7B can be reduced, so that the power supply pattern 7 can be made inexpensive. Further, in the above embodiment, the yoke 4B disposed on the side surfaces of the pair of moving coils 5 and 5' of the moving coil assembly is arranged between the protruding surface 42B and the fitting portions 41B at both ends.
Since the cross-sectional shape forms the yoke 4B and the movable coils 5, 5' of the movable coil assembly,
This has the advantage of narrowing the gap between them and increasing the magnetic flux density to improve thrust. Note that the moving coil assembly may include three or more moving coils. Further, the current collecting brush may be a rotatable roller. Although the moving coil assembly is bent above and below the permanent magnet in the rail, it does not have to be bent above and below the magnet.

``Effects'' As described above, the moving coil linear motor of this invention consists of a rail with an inverted U-shaped cross section made of non-magnetic material, a pair of yokes disposed opposite to each other on both sides of the inner surface of the rail, and On either one of the yokes, adjacent yokes facing the other yoke are arranged in the longitudinal direction so that their polarities are different,
A moving coil assembly comprising: a plurality of permanent magnets through which magnetic flux passes through the air gap with the other yoke; and a moving coil assembly capable of moving within the air gap in a direction perpendicular to the magnetic flux while being guided by a rail and the permanent magnets. includes a plurality of moving coils, and the winding direction of the winding portion of the moving coil is perpendicular to the magnetic flux; a current collector brush connected to the
The movable coil assembly includes positive and negative conductors disposed on the inner upper surface of the rail so as to be able to come into contact with the current collecting brush, and the movable coil assembly generates thrust in the moving direction depending on the relative position of the movable coil assembly and the permanent magnet. A permanent magnet is provided with a power feeding pattern that supplies power to each moving coil while switching the direction of the current flowing through each moving coil, and is characterized in that at least one of the plurality of moving coils is always driven. By arranging it on one side, the cross-sectional shape is small, and since the moving coil included in the moving coil assembly is switched and energized by the current collection brush and the power supply pattern, it is easy to connect and route the magnetic sensor and electronic switching circuit with the conductor wire. This has the effect of making it unnecessary.

Furthermore, since this invention enables switching of energization at the top of the moving coil assembly, the width of the gap in the magnetic flux path passing through the permanent magnet and both yokes is narrowed, thereby improving the thrust of the moving coil type linear motor. It has the effect of being able to

[Brief explanation of the drawing]

Fig. 1 is a perspective view of essential parts showing an embodiment of the linear motor according to this invention, Fig. 2 is a side view of the moving coil assembly, Fig. 3 is a perspective view showing the arrangement of the permanent magnets and the moving coil assembly, 4a, b, and c are a sectional view and a bottom view showing the relationship between the current flow of each moving coil of the moving coil assembly and the permanent magnet and the power supply pattern in the operating state. 1...Rail, 2...Magnet holding part, 3...
...Permanent magnet, 4A, 4B... Yoke, 41B...
Fitting portion, 42...Protruding surface, 5, 5'... Moving coil, 6A, 6B... Current collection brush, 7... Power feeding pattern, 7A, 7B... Positive and negative conductors, 7c... Insulating portion.

Claims (1)

[Claims for Utility Model Registration] (1) A rail with an inverted U-shaped cross section made of non-magnetic material, a pair of yokes disposed facing each other on both sides of the inner surface of the rail, and one of the yokes, A plurality of permanent magnets that are arranged in the longitudinal direction so that adjacent ones facing the other yoke have different polarities, and that conduct magnetic flux through the gap with the other yoke; and a rail and a permanent magnet that pass through the gap with the other yoke. A moving coil assembly capable of moving in a direction perpendicular to a magnetic flux guided by a moving coil assembly, the moving coil assembly including a plurality of moving coils, and a winding direction of a winding portion of the moving coil being perpendicular to the magnetic flux. A certain moving coil assembly, a current collecting brush provided on the upper part of the moving coil assembly and connected to the winding end of each moving coil, and a positive and negative current collector brush disposed on the upper surface of the rail so as to be able to come into contact with the current collecting brush. Each movable coil includes a conductor and switches the direction of the current flowing through each movable coil so that the movable coil assembly generates thrust in the moving direction according to the relative position of the movable coil assembly and the permanent magnet. What is claimed is: 1. A moving coil type linear motor comprising: a power feeding pattern for feeding power to; and at least one of the plurality of moving coils is always driven. (2) The current collecting brushes are provided in a row above the movable coil assembly, and the power feeding pattern is arranged such that positive and negative conductors that switch and come into contact with the current collecting brushes are intertwined with each other alternately. A moving coil type linear motor according to claim 1 of the utility model registration claim.