JPH04168966A - Linear motor device - Google Patents

Abstract

PURPOSE:To obtain particularly big driving force with a high efficiency by a method wherein a linear motor device comprises a flux converging member, consisting of a yoke having a pair of parallel magnetic passages, a permanent magnetic piece arranged on the magnetic passage and a ferromagnetic body, and a displacement member, equipped with a coil. CONSTITUTION:When a coil 25 is not arranged, flux between a permanent magnetic piece 23 and a second magnetic passage 30 becomes parallel flux as shown by arrows. On the other hand, when the coil 25 is arranged between an iron sheet 32 and the second magnetic passage 30, an air gap between the coil 25 and the iron sheet 32 becomes particularly small in appearance than an air gap between the iron sheet 32 and the second magnetic passage 30. Accordingly, flux from the permanent magnetic piece 23 constitutes a magnetic passage in a direction wherein a magnetic resistance is smallest or a direction wherein the flux is converged into a direction toward the coil 25.

Description

[Detailed description of the invention] [Industrial application field]

The present invention relates to a linear motor device.

[Conventional technology]

Conventionally, a linear motor device 11 as shown in FIG.
It has been known. This linear motor device 1 includes a U-shaped yoke 5 having a first magnetic path portion 2, a second magnetic path portion 3, and a connecting portion 4 connecting these, which are parallel to each other. 2 has a longitudinal bar shape or a longitudinal plate shape, and generates magnetic flux in a direction orthogonal to the longitudinal direction. For example, a permanent magnet piece 6 on the fixed side is arranged. A moving body 8 is provided which includes a coil 7 wound around the permanent magnet piece 8 at intervals with the longitudinal direction being the axial direction. In this linear motor device 1, by energizing the coil 7 of the movable body 8, a current flows in a direction intersecting the magnetic flux, and according to Fleming's law, the movable body 8
moves in the longitudinal direction of the permanent magnet piece 6.

[Problem to be solved by the invention]

In the conventional linear motor device l described above, the permanent magnet piece 6
The magnetic flux from the coil 7 passes through the coil 7 and the second magnetic path section 3 via an air layer having relatively high magnetic resistance. That is,
The problem is that the magnetic flux from the permanent magnet piece 6 acts on the coil 7 only from the part facing the coil 7, resulting in low efficiency, which limits the improvement of the driving force in the linear motor device 1. have.

[Purpose of the invention]

An object of the linear motor device of the present invention is to solve the above-mentioned technical problems and provide a linear motor device that can obtain a significantly large driving force with high efficiency.

[Means to solve the problem]

The present invention provides a yoke that has a pair of parallel magnetic path sections facing each other, generates magnetic flux in a predetermined direction, is elongated in a direction that intersects the direction in which the magnetic flux is generated, and is disposed on one magnetic path section. a magnetic flux convergence member made of a ferromagnetic material disposed on the permanent magnet piece, and a coil that winds the one magnetic path portion, the permanent magnet piece, and the convergence member with the longitudinal direction as the axial direction. 1. A linear motor device comprising: a displacement member having a displacement member;

[Function] The linear motor device according to the present invention includes a yoke having a pair of parallel magnetic path portions facing each other, and a yoke arranged on one of the magnetic path portions of the yoke and extending longitudinally in a direction intersecting the direction in which magnetic flux is generated. a permanent magnet piece, a magnetic flux convergence member made of a ferromagnetic material arranged on the permanent magnet piece, and a coil that winds the one magnetic path portion, the permanent magnet piece, and the convergence member with the longitudinal direction as the axial direction. and a displacement member. This reduces the air gap between one magnetic path section and the other magnetic path section, especially the air gap between one magnetic path section and the coil. Therefore, the magnetic flux from the permanent magnet piece is focused in the direction of least magnetic resistance, that is, toward the coil, and by energizing the coil, the efficiency of the driving force generated in the displacement member including the coil is significantly improved. be able to.

【Example】

FIG. 1 is a sectional view of a linear motor device 21 according to an embodiment of the present invention, and FIG. 2 is a sectional view taken along the section line 1--2 in FIG. The linear motor device 21 includes a pair of rod-shaped or plate-shaped permanent magnet pieces 23 and 24 that are parallel to each other and extend in the left-right direction in FIG. It is magnetized. In this embodiment, the permanent magnet piece 23 is magnetized along the vertical direction in FIG. 1 so that the upper part in FIG. 1 is the north pole and the lower part is the south pole.
The permanent magnet piece 24 is magnetized along the vertical direction in FIG. 1 so that the upper side in FIG. 1 is the S pole and the lower side is the N pole. The permanent magnet pieces 23 and 24 are fitted with a coil 25 whose longitudinal direction is the axial direction and which is commonly wound around the permanent magnet pieces 23 and 24, and the coil 25 is housed in a coil bobbin 26. This coil 25 and coil bobbin 26 constitute a displacement member 27. A yoke 28 surrounding the permanent magnet pieces 23, 24 and the coil 25 is also provided. The yoke 28 has a first magnetic path portion 29 disposed between the permanent magnet pieces 23.24 and extending along the longitudinal direction of the permanent magnet pieces 28.24, and the permanent magnet pieces 23.24 and the coil 25. A second magnetic path section 30 and a second magnetic path section 30 are arranged on opposite sides of the first magnetic path section 29, extend along the longitudinal direction of the permanent magnet piece 23224, and are connected at both ends to both ends of the first magnetic path section 29, respectively. 3 magnetic path section 31. In this embodiment, the permanent magnet piece 2 is placed on the permanent magnet piece 23, 24.
3.24.A steel plate 32. of ferromagnetic material is used over the entire length of 3.24.
33 is fixed. The distance between the iron plate 32.33 and the coil 25 is chosen to be much smaller than the distance between the iron plate 32.33 and each magnetic path section 30.31. Further, the iron plates 32 and 33 are not limited to iron, and are not limited to any type as long as they are ferromagnetic materials that have the effect of reducing magnetic resistance. FIG. 3 is a block diagram showing the electrical configuration related to the linear motor device 21. For example, a DC power supply device 34 is used to supply driving power for the linear motor device 21. The direction of direct current from the DC power supply device 34 is changed by the current direction changing device 35 in accordance with the desired direction of displacement of the displacement member 27, and the current is applied to the coil 25 of the linear motor device 21. As a result, the displacement member 27 is displaced to the right or to the left in FIG. At this time, in order to prevent the displacement member 27 from displacing excessively, overrun sensors 3B and 37, which are comprised of, for example, limit switches, are installed in the linear motor device 21.
The displacement member 27 is installed near both ends of the displacement member 1 in the displacement direction. FIG. 4 is a sectional view illustrating the present invention in detail.
and the coil 25 between the second magnetic path section 30 and the second magnetic path section 30. When the coil 25 is not arranged, the magnetic flux between the permanent magnet piece 23 and the second magnetic path section 30 is as shown by the arrow in FIG. 4(1). A parallel magnetic flux is created between the magnetic path portion 30 and the magnetic path portion 30 . On the other hand, when the coil 25 is arranged between the iron plate 32 and the second magnetic path section 30, the coil 25 and the iron plate 3
2, the air gap between the iron plate 32 and the second magnetic path section 3
The air gap between 0 and 0 is apparently smaller than the air gap between 0 and 0. Therefore, the magnetic flux from the permanent magnet piece 23 forms a magnetic path that converges in the direction of least magnetic resistance, that is, the direction toward the coil 25. As described above, among the magnetic flux generated from the permanent magnet piece 23, the magnetic flux that does not go toward the coil 25 can be reduced as much as possible, and the magnetic flux can be converged on the coil 25. Thereby, the efficiency of the driving force generated in the displacement member 27 when the coil 25 is energized can be significantly improved. That is, for the same driving power from the DC power supply device 34 shown in FIG. 3, it is possible to generate a much larger driving force than the conventional one, and it is possible to provide the linear motor device 21 with improved efficiency.

【Effect of the invention】

As described above, in the linear motor device according to the present invention, a permanent magnet piece and a magnetic flux converging member are arranged on one magnetic path portion of the yoke, and a permanent magnet piece and a converging member are arranged on one magnetic path portion of the yoke. and a displacement member having a coil wound around the displacement member. This reduces the air gap between one magnetic path section and the other magnetic path section of the yoke, especially the air gab between one magnetic path section and the coil. Therefore, the magnetic flux from the permanent magnet piece is focused in the direction of least magnetic resistance, that is, toward the coil, and by energizing the coil, the efficiency of the driving force generated in the displacement member including the coil is significantly improved. be able to.

[Brief explanation of drawings]

Fig. 1 is a sectional view of a linear motor device according to an embodiment of the present invention, Fig. 2 is a sectional view taken from the section line ■-■ in Fig. 1, and Fig. 3 is an electrical diagram related to the linear motor device. FIG. 4 is a block diagram showing the configuration, FIG. 4 is a perspective view explaining the present invention in detail, and FIG. 5 is a sectional view of a conventional linear motor device.

[Explanation of symbols]

21...Linear motor device, 23.24...Permanent magnet piece, 25...Coil, 27...Displacement member, 28...Yoke, 32.33...Iron plate patent application Agent of Shibaura Manufacturing Co., Ltd.
Patent attorney Tsuta 1) Shoko and 1 other person Figure 1 Figure 2 Figure 3

Claims (1)

[Claims] 1. A yoke having a pair of parallel magnetic path portions facing each other, and a yoke that generates magnetic flux in a predetermined direction, and has one magnetic path that is longitudinal in a direction that intersects the direction in which the magnetic flux is generated. a magnetic flux convergence member made of a ferromagnetic material disposed on the permanent magnet piece; and the one magnetic path, the permanent magnet piece, and the convergence member arranged with the longitudinal direction as the axial direction. A linear motor device comprising: a displacement member having a coil wound thereon.