JPH0116384Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a movable magnet type linear motor in which the movable element is equipped with a permanent magnet, thereby eliminating the need for power supply to the movable element.

As a conventional linear motor, JP-A-55-
As shown in Publication No. 83454, motors with various structures have been proposed, but all of them are moving coil type linear motors in which a large number of permanent magnet pieces are arranged on the stator side and a moving coil is moved within the magnetic flux. Since it is a motor, there is a problem in that it requires a power supply device for the moving coil, and it also requires a large amount of expensive permanent magnets, which increases the cost. Since it is difficult, it is disadvantageous for miniaturization. Furthermore, a support device for movably supporting the movable coil along the stator is required, resulting in a complicated and expensive structure.

The present invention was made in view of the above problems, and provides a moving magnet type linear motor that does not require power supply to the movable element side, has a relatively large thrust, and is small and inexpensive. The purpose is to

According to the present invention, two coils each having a substantially U-shaped cross section with the winding part and the air core part having the same width and having bent parts at the top and bottom are shifted by 1/3 of the total width of the coil, so that one coil has the same width as the other. A stator comprising a plurality of coil assemblies each having a substantially I-shaped cross section arranged back to back in a manner that the winding portion of the other coil is fitted into the air core portion and arranged densely in the longitudinal direction; It consists of a yoke formed to have a U-shaped cross section, and a mover made of flat plate-shaped permanent magnet pieces magnetized in the thickness direction and arranged on the opposing inner surfaces of the yoke so that the opposing polarities are different from each other. and furthermore, the magnet piece of the movable element is supported between the upper and lower bent portions of each coil projecting outward on both sides of the stator, and is movable along the stator. The characteristic moving magnet type linear motor is obtained, and the direction of the magnetic flux in the air gap due to the permanent magnet pieces of the mover is at right angles to the winding direction of the effective winding part of the stator, and the stator winding is adjusted according to the position of the mover. It is operated by sequentially switching the current of the parts.

Hereinafter, one embodiment of the present invention shown in the drawings will be described.

Figure 1 is a front view of one embodiment, and Figure 2 is its A-
A sectional view, Figure 3 is a perspective view of the coil, Figure 4 is a perspective view of a coil assembly made by combining two of them, and Figure 5 is a perspective view of the coil assembly.
The figure is a sectional view taken along line BB in FIG.

As shown in FIG. 3, the motor according to the present invention has two coils having a substantially U-shaped cross section, with both the width of the effective winding part 1a and the width of the air core part 1b, and the bent parts 1c at the top and bottom. Place 1A and 1B back to back and shift them by 1/3 of the total width of this coil.
The air core 1b of one coil 1A is connected to the other coil 1.
Fit the winding part 1a of B, and the two coils 1
The coil assembly 1 has a substantially I-shaped cross section in which the winding portions 1a of the coils A and 1B form a continuous surface and the upper and lower bent portions 1c of the coils 1A and 1B respectively protrude outward. a stator 2 consisting of a plurality of sets densely arranged in the longitudinal direction, a yoke 3 formed with a U-shaped cross section so as to straddle the stator, and a flat plate magnetized in the thickness direction with different polarities facing each other. A movable element 4 consisting of permanent magnet pieces 4A to 4D arranged on the opposing inner surfaces 3A and 3B of the yoke 3 so that adjacent polarities are different from each other.
The magnetic flux in the air gap 5 between the opposing permanent magnet pieces 4A to 4D of the movable element 4 is perpendicular to the winding direction of the effective winding portions 1a of the coils 1A and 1B in the stator 2.

The width of each of the permanent magnet pieces 4A to 4D is the same as the width of the winding portion 1a of the coils 1A and 1B, and adjacent magnet pieces are spaced apart from each other by one magnet piece. . The movable element 4 has each coil 1A, the magnet pieces 4A to 4D of which protrude outward on both sides of the stator 2.
It is supported between the upper and lower bent portions 1c of 1B and is movable along the stator 2.

In addition, 6A and 6B in FIG. 2 are non-magnetic guide members provided on the movable element 4 side so that the movable element 4 can smoothly move along the stator 2, and are spaced apart by one magnet piece. It is provided so as to cover both adjacent magnet pieces so that the faces of the adjacent magnet pieces facing the stator 2 are continuous surfaces. These guide members 6A, 6B
are omitted from illustration in FIG.

Next, the operation of the invented motor with the above configuration is as follows.
This will be explained using FIG.

In the position shown in FIG. 5a, the coil 1A is energized,
Subsequently, the coil 1B is also energized. In the magnetic flux from the N pole of the magnet piece 4A to the S pole of the magnet piece 4B in the mover 4, the winding part 1 on the left side of the coil 1A
The winding part 1 on the right side of the coil 1A is generated in the current flowing from the front toward the surface of the paper, and in the magnetic flux conversely flowing toward the north pole of the magnet piece 4C and the south pole of the magnet piece 4D.
When a current flows through a toward the front from the plane of the paper, each winding portion 1a of the coil 1A receives a force toward the left in the plane of the paper due to Fleming's left-hand rule, and the movable element 4 receives a reaction force toward the right in the plane of the paper. occurs.
As shown in the figure b, magnet pieces 4A to 4 of the mover 4
At the position where D faces both coils 1A and 1B,
Current is flowing through both the coil 1A and the coil 1B, and the movable element 4 is moving in this state. When the mover 4 reaches the position shown in c in the figure, the coil 1
B remains energized, and coil 1A is not energized. In this state, the winding portion 1a of coil 1B
is the current flowing from the front toward the paper surface, and the coil 1B
When a current flows through the winding portion 1a on the right side of the paper toward the front from the plane of the paper, the winding portion 1a of the coil 1B receives a magnetic flux from the N pole of the magnet piece 4A to the S pole of the magnet piece 4B, and the magnetic flux from the magnet piece 4C to the S pole of the magnet piece 4B. Magnet piece 4D from N pole
receives a force to the left due to the magnetic flux heading towards the S pole of
The movable element 4 continues to move rightward due to the reaction force. Figure 4 d shows that the direction of the current in the coil 1A is reversed to that shown in Figures a and b, and the coil 1B is
2 shows a state in which the movable element 4 is further moved to the right while the current is maintained as it is. In addition,
In this state, the coil 1A of another adjacent coil assembly 1 is also energized in the same direction as the coil 1A of the coil assembly 1 that was initially facing it, and up to three coils are energized to move the mover 4 to the right. move in the direction.

As mentioned above, the coils 1A, 1B, . . . of the stator 2 correspond to the positions of the magnet pieces 4A to 4D of the movable element 4.
By sequentially switching the input current of the mover 4
moves to the right with almost constant thrust. To move the mover 4 to the left, coils 1A,
The input current to 1B... may be set in the opposite direction to that during rightward movement at all positions.

As stated above, since the motor of the present invention has the above configuration, it is not necessary to supply power to the movable side, and the amount of permanent magnets used is very small, resulting in low cost, and unlike rare earth magnets. In addition to the usual effect of using a movable magnet type, which makes it easier to use high-performance magnets in terms of cost, there are also the following excellent effects.

In other words, in the motor of the present invention, since there is a winding section of the coil having a substantially U-shaped cross section without interruption over the entire length of the stator in the longitudinal direction, a nearly constant thrust can be obtained, and the winding section is continuous. The thickness of the stator becomes almost the same as the thickness of one coil, and this makes it possible to reduce the gap between the opposing permanent magnet pieces of the mover, increasing the magnetic flux density and achieving high thrust. can get. In addition, since the magnet pieces of the mover are movably supported using the upper and lower bent portions that are not effective in generating thrust from each coil that protrudes outward on both sides of the stator, the mover can be moved between the stator and the stator. There is no special need for a support device for movably supporting the engine along the axis, and the configuration can be significantly simplified while maintaining high thrust, making it small and inexpensive.

[Brief explanation of the drawing]

Figure 1 is a front view of one embodiment, and Figure 2 is its A-
A sectional view, FIG. 3 is a perspective view of a coil with a U-shaped cross section, FIG. 4 is a perspective view of a coil assembly made by combining two coils, and FIG. 5 is a BB sectional view of FIG. 1. . DESCRIPTION OF SYMBOLS 1... Coil assembly, 1A, 1B... Coil having a substantially U-shaped cross section, 2... Stator, 3... Yoke, 4
...Mover, 4A to 4D...Permanent magnet piece, 5...
void.

Claims (1)

[Scope of utility model registration request] Two coils each having a generally U-shaped cross section with the same width for the winding part and the air core part and a bent part at the top and bottom are shifted by 1/3 of the total width of the coil, and the air core part of one coil is placed in the other coil. A stator includes a plurality of coil assemblies each having a generally I-shaped cross section, which are assembled back to back so that the winding portions of the coil assemblies are fitted into each other, and are densely arranged in the longitudinal direction, and a stator having a U-shaped cross section so as to straddle the stator. and a movable member made of flat plate-shaped permanent magnet pieces arranged on opposing inner surfaces of the yoke so that they are magnetized in the thickness direction and have opposite polarities, and the movable member is a movable magnet type, characterized in that the magnet pieces are supported between the upper and lower bent portions of each coil projecting outward on both sides of the stator, and are movable along the stator. linear motor.