JP2008066602A - Electromagnetic actuator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce loss by eddy current in an armature and to improve efficiency for opening/closing a switch. <P>SOLUTION: An electromagnetic actuator includes: a yoke 1 for forming a magnetic path; the armature 2 moving in the yoke 1; a closed coil 3 and an opened coil 4 for increasing/decreasing a magnetic flux of the yoke 1; a permanent magnet 5 for attracting the armature 2; and an operating rod 6 made of a non-magnetic material fixed to the armature 2 and passing through one side face of the yoke 1. The armature 2 is divided into a plurality of pieces so that a plurality of magnetic circuits are formed in the armature 2 when the closed coil 3 and the opened coil 4 are excited. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an electromagnetic actuator used in an operation mechanism for opening / closing a switch such as a vacuum circuit breaker.

  In this type of switch operating mechanism, there is an operating mechanism that generates necessary operating force with an electromagnetic actuator in order to perform an opening operation and a closing operation. The electromagnetic actuator consists of an operating rod connected to the movable shaft of the switch, an armature fixed to the operating rod, a yoke for moving the armature by forming a magnetic path, and a solenoid coil for increasing or decreasing the magnetic flux in the yoke Is done.

And since an armature forms a magnetic circuit with a yoke, it laminates | stacks a thin steel plate and makes the edge part trapezoid shape, and is assembled by the integral structure (for example, refer patent document 1). Moreover, in what consists of a cylindrical part and a disc part, these are assembled by the integral structure (for example, refer patent document 2).
JP 2004-146336 A (Page 7, FIG. 4) Japanese Patent Laid-Open No. 11-72179 (5th page, FIG. 1)

The above conventional electromagnetic actuator has the following problems.
Since the armature has an integral structure, when the solenoid coil is energized, eddy currents are generated inside and the loss of magnetic force is large. Moreover, it was heavy. For these reasons, the magnetic force generated by the solenoid coil cannot be fully utilized, and the efficiency of the switching operation of the switch is reduced. In addition, it is difficult to improve the opening / closing speed.

  Therefore, there has been a demand for an electromagnetic actuator that can suppress loss due to eddy current of the armature, further reduce the weight of the armature, and improve the efficiency of opening / closing the switch.

  The present invention has been made to solve the above problems, and an object thereof is to provide an electromagnetic actuator capable of improving the efficiency of opening and closing operations.

  In order to achieve the above object, an electromagnetic actuator according to the present invention attracts a yoke for forming a magnetic path, an armature that moves in the yoke, a solenoid coil that increases or decreases the magnetic flux of the yoke, and the armature. A permanent magnet and a non-magnetic operating rod fixed to the armature and penetrating one side of the yoke are provided. A plurality of the armatures are formed so that a plurality of magnetic circuits are formed in the armature. It is characterized by being divided.

  According to the present invention, since the armature is divided into a plurality of parts and the magnetic circuit formed by the contacting and separating yokes becomes a plurality of circuits, the loss due to the eddy current is suppressed and the efficiency of opening and closing the switch is improved. Can be improved.

  Embodiments of the present invention will be described below with reference to the drawings.

  First, an electromagnetic actuator according to Embodiment 1 of the present invention will be described with reference to FIGS. 1 is a partially cutaway perspective view showing the configuration of an electromagnetic actuator according to Embodiment 1 of the present invention, and FIG. 2 is a top view showing the configuration of the electromagnetic actuator according to Embodiment 1 of the present invention.

  As shown in FIG. 1, the electromagnetic actuator includes a cylindrical yoke 1 for forming a magnetic path, a magnetic armature 2 that moves movably in the yoke 1, and a closed coil 3 that increases and decreases the magnetic flux in the yoke 1. And a solenoid coil composed of an open coil 4, a permanent magnet 5 that attracts the armature 2, and a non-magnetic coupling that is fixed to the armature 2 and that movably passes through one side of the yoke 1 and is connected to a movable shaft of a switch (not shown). The operation rod 6 is made of a magnetic material. The permanent magnet 5 is attracted to keep the switch closed.

  Here, the yoke 1 is provided inside the disk-shaped upper surface portion 1a serving as one side surface, a cylindrical outer peripheral portion 1b connected to the outer peripheral portion so as to surround the upper surface portion 1a, and an intermediate portion of the outer peripheral portion 1b. An annular intermediate portion 1c provided in a protruding manner, fixed to the permanent magnet 5, and connected to the upper surface portion 1a at the outer periphery of the annular magnet portion 1d, which is in contact with and away from the armature 2 described later, and the armature 2 described later. It is comprised from the cylindrical cylindrical part 1e which contacts / separates.

  The armature 2 includes a cylindrical tube portion 2a and a flange portion 2b connected to the tube portion 2a and extending in the radial direction. Here, the cylindrical portion 2a is provided with a plurality of groove portions 2c formed coaxially with the operating rod 6 in the entire axial direction of the cylindrical portion 2a. That is, as shown in FIG. 2, the cylindrical portion 2a is provided with two groove portions 2c having slight widths with different radii, and is divided into three coaxially. This divided surface becomes a contact surface and comes into contact with and separates from the cylindrical portion 1e. The armature 2 may be formed by laminating thin steel plates, or may be formed by compressing magnetic powder.

  The cylindrical portion 2a having such a groove portion 2c can be easily manufactured by manufacturing in advance those having different radii and fixing them to the flange portion 2b. Moreover, it can manufacture easily also by inserting an insulating film in a predetermined position in the process which rolls and laminates a thin steel plate. In this case, the insulating film is the same as the groove 2c.

  Further, the collar portion 2b of the armature 2 is adapted to come into contact with and separate from the magnet portion 1d. The cylindrical portion 2a and the cylindrical portion 1e, and the flange portion 2b and the magnet portion 1d are in contact when the switch is closed, and are separated when the switch is open.

  As a result, as shown by the dotted line in FIG. 1, the magnetic circuit formed when the closed coil 3 and the open coil 4 are excited is branched into three circuits m1, m2, and m3 in the armature 2. The These magnetic circuits m 1, m 2, and m 3 merge in the yoke 1 and the permanent magnet 5.

  Since the magnetic circuit is thus branched, the eddy current in the armature 2 can be reduced. And a big magnetic force can be generated and the efficiency of opening and closing operation can be improved. Moreover, since the armature 2 can be reduced in weight, the opening and closing speed can be improved.

  According to the electromagnetic actuator of the first embodiment, the cylindrical portion 2a of the armature 2 is provided with the coaxial groove portion 2c so as to be in contact with and separated from the cylindrical portion 1e of the yoke 1, so that a plurality of magnetic circuits are provided in the armature 2. It becomes a circuit, the loss due to the eddy current is suppressed, the magnetic force by the closed coil 3 or the open coil 4 can be fully utilized, and the efficiency of opening and closing the switch can be improved.

  In the first embodiment, the cylindrical portion 2a of the armature 2 has been described as being divided into a plurality of parts. However, the flange portion 2b is also provided with a coaxial groove in the portion of the yoke 1 that is in contact with and separated from the magnet part 1d. May be.

  Next, an electromagnetic actuator according to Embodiment 2 of the present invention will be described with reference to FIG. FIG. 3 is a perspective view showing a part of the configuration of the electromagnetic actuator according to the second embodiment of the present invention. The second embodiment is different from the first embodiment in that a groove portion is also provided in the cylindrical portion of the yoke. In FIG. 3, the same components as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  As shown in FIG. 3, in the cylindrical portion 1e of the yoke 1 that is in contact with and away from the cylindrical portion 2a of the armature 2, a groove portion 1f formed coaxially with the operating rod 6 is opposed to the dividing surface of the cylindrical portion 2a. Is provided. It is preferable to provide the groove portion 1f and the groove portion 2c so as to be opposed to each other because a decrease in the contact / separation area can be suppressed and magnetic resistance can be suppressed.

  According to the electromagnetic actuator of the second embodiment, in addition to the effects of the first embodiment, the eddy current in the cylindrical portion 1e of the yoke 1 is suppressed, and the efficiency of opening / closing the switch can be further improved.

  Next, an electromagnetic actuator according to Embodiment 3 of the present invention will be described with reference to FIG. FIG. 4 is a perspective view showing a part of the configuration of the electromagnetic actuator according to the third embodiment of the present invention. The third embodiment differs from the second embodiment in that a contact plate is provided on the armature cylinder. In FIG. 4, the same components as those in the second embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  As shown in FIG. 4, a thin contact plate 2 d that covers the groove 2 c is provided on the cylindrical portion 2 a of the armature 2 that is in contact with and separated from the cylindrical portion 1 e of the yoke 1. That is, the divided surfaces divided by the groove 2c are integrated with the contact plate 2d.

  According to the electromagnetic actuator of the third embodiment, in addition to the effect of the second embodiment, the area of the cylindrical portion 2a that is in contact with and away from the cylindrical portion 1e increases, so that the efficiency of opening and closing the switch can be further improved. it can.

  In the third embodiment, the contact plate 2d is provided on the armature 2 side, but a contact plate may also be provided on the columnar portion 1e side of the yoke 1 so that the divided surfaces are integrated. Here, when the groove 1f of the cylindrical portion 1e of the yoke 1 is omitted, the contact plate 2d is provided only on the armature 2 side.

  Next, an electromagnetic actuator according to Embodiment 4 of the present invention will be described with reference to FIG. FIG. 5 is a top view showing the configuration of the electromagnetic actuator according to the fourth embodiment of the present invention. The fourth embodiment differs from the first embodiment in the shape of the armature. In FIG. 5, the same components as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  As shown in FIG. 5, the cylindrical portion 2 a of the armature 2 is provided with a plurality of columnar bodies 2 f arranged radially in the cylindrical body 2 e on the inner diameter side and the outer diameter side. That is, the cylinder part 2a is divided into a plurality of parts in the circumferential direction. The columnar body 2f may have any shape such as a square shape, a polygonal shape, a circular shape, or a fan shape in cross section.

  According to the electromagnetic actuator of the fourth embodiment, since the armature 2 is divided into a plurality of parts in the circumferential direction, loss due to eddy current can be suppressed.

  In the fourth embodiment, the cylindrical portion 2a of the armature 2 is divided and described, but the columnar yoke 1e of the yoke 1 may be divided and arranged in a radial manner. Moreover, you may provide the contact plate which covers this division surface integrally in the division surface of the cylinder part 2a or the cylindrical part 1e.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing a part of a configuration of an electromagnetic actuator according to a first embodiment of the present invention. 1 is a top view showing a configuration of an electromagnetic actuator according to Embodiment 1 of the present invention. FIG. 5 is a perspective view showing a configuration of an electromagnetic actuator according to Example 2 of the present invention, with a part cut away. FIG. 10 is a perspective view showing a configuration of an electromagnetic actuator according to Example 3 of the present invention with a part cut away. The top view which shows the structure of the electromagnetic actuator which concerns on Example 4 of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Yoke 1a Upper surface part 1b Outer peripheral part 1c Middle part 1d Magnet part 1e Cylindrical part 1f, 2c Groove part 2 Armature 2a Cylindrical part 2b Contact part 2e Cylindrical body 2f Columnar body 3 Closed coil 4 Opening coil 5 Permanent magnet 6 Operation rod

Claims (5)

A yoke for forming a magnetic path;
An armature moving in the yoke;
A solenoid coil for increasing or decreasing the magnetic flux of the yoke;
A permanent magnet for attracting the armature;
A non-magnetic operating rod fixed to the armature and penetrating one side of the yoke;
An electromagnetic actuator comprising a plurality of armatures divided so that a plurality of magnetic circuits are formed in the armature.   The electromagnetic actuator according to claim 1, wherein a contact surface of the armature that is in contact with and away from the yoke is divided coaxially.   The electromagnetic actuator according to claim 1, wherein a contact surface of the armature that is in contact with and away from the yoke is divided in a circumferential direction.   4. The electromagnetic actuator according to claim 2, wherein a contact surface of the yoke contacting and separating from the armature is divided so as to face a division surface of the armature. 5.   5. The electromagnetic actuator according to claim 2, wherein a contact plate is provided on at least one of the split surfaces of the armature and the yoke so as to integrally cover the split surface. 6.

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