JP2005348505A - Electromagnetic actuator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electromagnetic actuator which has a long stroke and can generate thrust in both directions relative to a plunger by switching the conducting direction, and furthermore can generate holding forces at ends in both directions relative to the plunger in an unenergized state. <P>SOLUTION: The electromagnetic actuator includes a fixing member 240 with a coil wound around and movable members 212, 214 on which permanent magnets 230a, 230b generating magnetic fields orthogonally crossing the winding surface of the coil are mounted, in which the movable members are moved by the force generated by interaction between the magnetic field generated by the permanent magnets and a current flowing through the coil. Magnetic bodies 151 to 154 which hold movable members at the position of the opposite ends of the moving channels in cooperation of the permanent magnets are provided to the fixing member. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an electromagnetic actuator used for swinging a switch rail at a branch point of a conveyor.

Conventionally, as an electromagnetic actuator used for swinging a switch rail at a branch point of a conveyor, a cylindrical push-pull solenoid is used. A self-holding solenoid capable of maintaining an attracted state even when not energized is known (for example, see Patent Document 1).
JP 7-263222 A

  However, the conventional self-holding solenoid as described above has a short stroke of about 10 mm and has limited applications. Moreover, it was not possible to generate thrust in both directions with respect to the plunger by switching the energization direction. Furthermore, it was not possible to generate a holding force at the end portions in both directions when the power was not supplied.

  Therefore, an object of the present invention is to generate a thrust in both directions with respect to the plunger by switching the energization direction and generating a holding force at the end portions in both directions when de-energized. An object of the present invention is to provide an electromagnetic actuator capable of

  The invention according to claim 1 has a fixed member around which a coil is wound, and a movable member to which a permanent magnet that generates a magnetic field orthogonal to a winding surface of the coil is attached, and is generated by the permanent magnet. An electromagnetic actuator in which the movable member is moved by a force generated by an interaction between a magnetic field and a current flowing through the coil, wherein the magnetic body holds the movable member at positions on both ends of a moving path in cooperation with the permanent magnet. By providing the fixing member on the fixing member, the above-described object is achieved.

  According to the first aspect of the present invention, there is provided a stationary member around which a coil is wound, and a movable member to which a permanent magnet that generates a magnetic field orthogonal to the winding surface of the coil is attached, and is generated by the permanent magnet. An electromagnetic actuator in which the movable member moves due to a force generated by the interaction between the generated magnetic field and the current flowing through the coil, and holds the movable member at positions at both ends of the movement path in cooperation with the permanent magnet. Since the magnetic body is provided on the fixed member, the stroke of the movable member can be lengthened, the thrust can be generated in both directions by switching the energization direction, and the movable member A holding force is generated at both ends of the moving path.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  In FIG. 1, the members denoted by reference numerals 212 and 214 are slide frames (movable members) arranged in parallel, and permanent magnets 230a and 230b are fixed so that the N and S poles face each other. Has been. The permanent magnets 230a and 230b generate a vertical magnetic field that passes through the air-core coil 242. At this time, the number of turns of the air-core coil 242 is N (number of turns), the length of the coil crossing the vertical magnetic field is L (m), the current flowing through the coil is I (A), and the magnetic flux density of the vertical magnetic field is B (T Then, the coil receives a thrust of F (N) = B (T) × I (A) × L (m) × N (number of turns) × 2 according to Fleming's left-hand rule. Here, the last multiplier of 2 means that the same force acts on the left and right sides of the air-core coil. The direction of the thrust F (N) acts in a direction perpendicular to both the direction of the vertical magnetic field and the current flowing through the coil. As a result, as shown in FIGS. 1A and 1B, the direction of thrust applied to the coil can be reversed by reversing the energizing direction to the air-core coil. At this time, by fixing the coil, the slide frames 212 and 214 slide by receiving the thrust due to the reaction of the thrust F (N) generated in the coil.

  Further, the fixed frame 240 (fixed member) supporting the air-core coil 242 has iron cores 151 to 154 at positions where the slide frames 212 and 214 overlap with one side of the permanent magnets 230a and 230b on one side when the slide frames 212 and 214 slide left and right. Is buried. Therefore, when energized as shown in FIG. 1A and the slide frames 212 and 214 slide to the left, the permanent magnets 230a and 230b installed on the right side of the slide frames 212 and 214 in FIG. One side and the iron cores 153 and 154 are adsorbed. As a result, even when the power supply to the coil is stopped, the slide frames 212 and 214 are held slid to the left side by the attractive force between the permanent magnets 230a and 230b and the iron cores 153 and 154.

  On the other hand, when the slide frames 212 and 214 are slid rightward as shown in FIG. 1B, the permanent magnets 230a and 230b installed on the left side of the slide frames 212 and 214 in FIG. One side and the iron cores 151 and 152 are adsorbed. As a result, even when the power supply to the coil is stopped, the slide frames 212 and 214 are held in a state of being slid rightward by the attractive force between the permanent magnets 230a and 230b and the iron cores 151 and 152.

  In this embodiment, the iron core is used as the magnetic body for holding the slide frame in cooperation with the permanent magnets 230a and 230b of the slide frame. However, a permanent magnet can also be used. In that case, by arranging the magnetic poles of the permanent magnets embedded in the fixed frame so as to be attracted to the magnetic poles of the permanent magnets 230a and 230b, it is possible to obtain a larger self-holding force than when an iron core is used. Further, by making the permanent magnets 230a and 230b installed on the slide frame large, the stroke of the slide frame can be increased without increasing the current value supplied to the air-core coil.

  2 to 10 are schematic views showing an electromagnetic actuator which is another embodiment of the present invention. In this electromagnetic actuator, an air-core coil 342 is wound around a fixed frame 340 in a substantially trapezoidal shape, and although not shown, a slide frame is pivotally supported by a swing shaft 360 that is suspended from the fixed frame 340. By energizing 342, the slide frame swings left and right about the swing shaft 360. In each of FIGS. 2 to 10, (a) shows a state in which the slide frame swings to the left (counterclockwise), and (b) shows that the slide frame swings to the right (clockwise). Indicates the state. The principle that the slide frame swings is the same as the principle that the slide frame of the first embodiment slides, and the details are omitted.

  In the embodiment shown in FIG. 2, although not shown, an iron core 350, which is a magnetic body for holding the slide frame at the swing end, is provided at the approximate center of the fixed frame 340. When the slide frame swings to the left with the swinging shaft 360 as the rotation axis, one side of the permanent magnet 330b (330a) fixed to the right side of the slide frame and the iron core 350 are attracted, and even when no power is supplied Keep state.

  Further, by using a large iron core 352 as shown in FIG. 3, the overlap between the iron core 352 and the permanent magnet 330a (330b) is increased, and the holding force is increased. Furthermore, as shown in FIG. 4 or FIG. 5, it is possible to hold the left and right permanent magnets fixed to the slide frame using separate iron cores by using a small iron core 354 or iron core 356. In addition to providing the iron core 358 at the approximate center of the fixed frame, it is possible to further increase the holding force by attaching iron cores 362 and 364 on the swing end side as shown in FIG. . Further, as shown in FIGS. 7 and 8, the iron core 366 may be elliptical, and a rotation shaft may be provided at the center, and the holding force can be varied by changing the direction of the iron core. Further, as shown in FIGS. 9 and 10, the iron core 368 has an elliptical shape, and the rotation axis is provided in the vicinity of the long diameter end, whereby the left and right holding force can be changed by tilting the iron core 368.

  The present invention provides an electromagnetic actuator having a very simple configuration and a long stroke, and its applicability is extremely high.

It is explanatory drawing which shows the structure of the electromagnetic actuator of this invention. It is the conceptual diagram which showed another embodiment of this invention. It is the conceptual diagram which showed another embodiment of this invention. It is the conceptual diagram which showed another embodiment of this invention. It is the conceptual diagram which showed another embodiment of this invention. It is the conceptual diagram which showed another embodiment of this invention. It is the conceptual diagram which showed another embodiment of this invention. It is the conceptual diagram which showed another embodiment of this invention. It is the conceptual diagram which showed another embodiment of this invention. It is the conceptual diagram which showed another embodiment of this invention.

Explanation of symbols

151-154 ... Iron core (magnetic material)
212, 214 ... Slide frame (movable member)
230a, 230b ... Permanent magnet 240 ... Fixed frame (fixed member)
242 ... Air-core coil 350, 352, 354, 356, 358 ... Iron core (magnetic material)
362, 364, 366, 368 ... Iron core (magnetic material)

Claims (1)

A fixed member around which a coil is wound, and a movable member to which a permanent magnet that generates a magnetic field orthogonal to a winding surface of the coil is attached, and the magnetic field generated by the permanent magnet and the current flowing through the coil In the electromagnetic actuator in which the movable member moves by the force generated by the interaction of
An electromagnetic actuator characterized in that a magnetic body that holds the movable member at positions on both ends of a moving path in cooperation with the permanent magnet is provided on the fixed member.

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