JP2010225666A - Electromagnetic actuator and assembling method thereof - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve a method for fixing a permanent magnet used for an electromagnetic actuator to a yoke, for improved assemblability. <P>SOLUTION: The electromagnetic actuator includes the yoke 1 which forms a magnetic path, an armature 2 of magnetic material that freely moves in the yoke 1, a permanent magnet 3 which moves or holds the armature 2, a closed path coil 4 and an open path coil 5 for increasing/decreasing a magnetic flux in the yoke 1, and an operation rod 6 of non-magnetic material which is secured to the armature 2 and is connected to a switch. A first adhesive layer 10a is provided on one surface of the permanent magnet 3 and is secured to a yoke 1d for securing a permanent magnet. A second adhesive layer 10b is provided to the other surface of the permanent magnet 3, for securing a yoke 1f for attaching/detaching an armature. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an electromagnetic actuator used for opening / closing operation of a switch and an assembling method thereof.

  2. Description of the Related Art Conventionally, an operation mechanism for a switch such as a vacuum circuit breaker is known that uses an electromagnetic actuator that generates an operation force necessary for performing an opening / closing operation (for example, see Patent Document 1).

  FIG. 5 shows an electromagnetic actuator of this type, which is composed of a yoke 1 that forms a magnetic path, a magnetic armature 2 that moves movably in the yoke 1, a permanent magnet 3 that moves or holds the armature 2, A closed coil 4 and an open coil 5 for increasing and decreasing the magnetic flux of the yoke 1, and a non-magnetic operating rod 6 fixed to the armature 2 and penetrating through the yoke and connected to a switch (not shown).

  The yoke 1 includes a disk-shaped first yoke 1a through which the operation rod 6 passes through the center, and a columnar second yoke connected to the inner periphery of the first yoke 1a through which the operation rod 6 passes. 1b, a cylindrical third yoke 1c connected to the outer periphery of the first yoke 1a and having closed and open coils 4, 5 disposed on the inner peripheral surface, and an inner peripheral surface protruding to the third yoke 1c. An annular fourth yoke 1d facing the armature 2 and having a permanent magnet 3 fixed thereto, a cylindrical fifth yoke 1e connected to the fourth yoke 1d, and the permanent magnet 3 are connected to the fourth yoke 1d. It is comprised by the cyclic | annular 6th yoke 1f arrange | positioned so that it may clamp.

  The sixth yoke 5f and the permanent magnet 3 are fixed to the fourth yoke 1d with a plurality of non-magnetic bolts 7.

  The armature 2 is a cylindrical first armature 2a whose axial direction surface is in contact with and away from the second yoke 1b, and a disk-like shape in which the outer surface of the sixth yoke 1f is connected to and separated from the first armature 2a. It consists of a second armature 1b.

JP 2007-73580 A (pages 3 to 4, FIG. 1)

  The above conventional electromagnetic actuator has the following problems. When the sixth yoke 1f is attached to the permanent magnet 3 and these are attached to the fourth yoke 1d, the fourth yoke 1d and the sixth yoke 1f are attracted to the permanent magnet 3, and the permanent magnet 3 is subjected to an impact at the time of contact. Could be damaged. Further, in the alignment after the mounting, the attractive force of the permanent magnet 3 works, and it is difficult to adjust the dimensions when the bolt 7 is penetrated. Furthermore, the jig for adjusting the dimensions has to be made of a non-magnetic material, which is a special assembly jig.

  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 assembling property and an assembling method thereof.

  In order to achieve the above object, an electromagnetic actuator of the present invention includes a yoke that forms a magnetic path, an armature of a magnetic body that moves movably in the yoke, a permanent magnet that moves or holds the armature, An electromagnetic actuator having a closed coil and an open coil for increasing or decreasing a magnetic flux in a yoke, and a non-magnetic operating rod fixed to the armature and connected to a switch, wherein the first magnet is provided on one surface of the permanent magnet. An adhesive layer is provided and fixed to the permanent magnet fixing yoke, and a second adhesive layer is provided on the other surface of the permanent magnet to fix the armature contacting / separating yoke.

  According to the present invention, since the permanent magnet and the yoke are bonded and fixed with an adhesive, the dimensions can be finely adjusted when the adhesive is in an uncured state, and the assembly of the electromagnetic actuator can be improved. it can.

Sectional drawing which shows the structure of the electromagnetic actuator which concerns on Example 1 of this invention. Sectional drawing which shows the structure of the electromagnetic actuator which concerns on Example 2 of this invention. Sectional drawing which shows the structure of the electromagnetic actuator which concerns on Example 3 of this invention. Sectional drawing which shows the structure of the electromagnetic actuator which concerns on Example 4 of this invention. Sectional drawing which shows the structure of the conventional electromagnetic actuator.

  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 FIG. 1 is a cross-sectional view illustrating a configuration of an electromagnetic actuator according to a first embodiment of the present invention. In FIG. 1, the same components as those in the prior art are denoted by the same reference numerals.

  As shown in FIG. 1, the electromagnetic actuator includes a yoke 1 that forms a magnetic path, a magnetic armature 2 that moves movably in the yoke 1, an annular permanent magnet 3 that moves or holds the armature 2, and a yoke 1. An annular closing coil 4 and an opening coil 5 for increasing and decreasing the magnetic flux, and a non-magnetic operating rod 6 fixed to the armature 2 and penetrating through the yoke and connected to a switch (not shown).

  The yoke 1 has a disk-shaped first yoke 1a through which the operation rod 6 passes through the center, and a columnar first yoke that is connected to the inner periphery of the first yoke 1a and through which the operation rod 6 passes through the center. 2 yoke 1b, a cylindrical third yoke 1c having a closed circuit and open coils 4 and 5 disposed on the inner peripheral surface thereof connected to the outer periphery of the first yoke 1a, and an inner peripheral surface connected to the third yoke 1c. Protrudes and opposes the armature 2, and the annular fourth yoke 1d having the permanent magnet 3 fixed by the first adhesive layer 10a, and the cylindrical fifth yoke connected to the outer periphery of the fourth yoke 1d. 1e and the permanent magnet 3 are arranged so as to be sandwiched between the fourth yoke 1d and the ring-shaped sixth yoke 1f fixed by the second adhesive layer 10b. The first adhesive layer 10a and the second adhesive layer 10b are formed of an adhesive such as an epoxy resin, and the thickness thereof is several tens to several hundreds μm.

  The armature 2 is a cylindrical first armature 2a whose axial direction surface is in contact with and away from the second yoke 1b, and a disk-like shape in which the outer surface of the sixth yoke 1f is connected to and separated from the first armature 2a. It consists of a second armature 1b.

  When the switch is in the closed state, the closed coil 4 is excited to attract the second yoke 1b and the first armature 2a, and the sixth yoke 1f and the second armature 2b. After the closing, the closing coil 4 is de-energized and the closing is held by the magnetic force of the permanent magnet 3. In the open circuit state, the open coil 5 is excited to generate a magnetic force that overcomes the permanent magnet 3, and the second yoke 1b and the first armature 2a, and the sixth yoke 1f and the second armature 2b are moved. Repel.

  Next, an assembly method of the electromagnetic actuator, particularly an assembly method around the permanent magnet 3 will be described.

  First, the first to fifth yokes 1 a to 1 e, the closed and open coils 4 and 5 are assembled, and the sixth yoke 1 f is bonded to one surface of the permanent magnet 3. When the adhesive is applied to the sixth yoke 1f and is in an uncured state, even if the magnetic force of the permanent magnet 3 works, the dimensions of the mutual center axes and the like can be finely adjusted. After the adjustment, when the adhesive is cured while maintaining the state, the cured second adhesive layer 10 b is formed, and the sixth yoke 1 f can be firmly fixed to the permanent magnet 3. Further, since the permanent magnet 3 is not directly brought into contact with the sixth yoke 1f but through the second adhesive layer 10b, the second adhesive layer 10b becomes a buffer layer, and the impact force at the time of contact is reduced. be able to.

  Here, since the second armature 2b contacts and separates from the sixth yoke 1f by the movement of the armature 2, this is defined as an armature contacting / separating yoke.

  Next, the other surface of the permanent magnet 3 is bonded to the fourth yoke 1d. Also in this case, similarly to the above, when the adhesive is in an uncured state, the dimensions are finely adjusted, the adhesive is cured, and the first adhesive layer 10a is formed. The formation of the second adhesive layer 10b and the first adhesive layer 10a may be reversed in the above order.

  Here, since the permanent magnet 3 is fixed to the fourth yoke 1d, this is defined as a permanent magnet fixing yoke.

  When the heat curing type is used for the adhesive, the curing time can be controlled at the heating temperature, and workability can be improved. The term “curing” as used herein means that the gelation starts from a liquid state and does not move with some stress. Therefore, in order to firmly fix the permanent magnet 3, the sixth yoke 1f, and the fourth yoke 1d, the heating time is extended and the adhesive layers 10a and 10b are completely cured.

  Thereafter, the armature 2 and the operating rod 6 are passed through the yoke 1. At the time of assembling, the assembly work can be facilitated by setting the fifth yoke 1e side upward and the first yoke 1a side downward.

  Here, if the permanent magnet 3 is magnetized after assembly, the dimensions can be finely adjusted without being affected by the magnetic force. Further, a special assembly jig such as a non-magnetic material can be dispensed with.

  According to the electromagnetic actuator of the first embodiment, the permanent magnet 3, the fourth yoke 1d, and the sixth yoke 1f are fixed via the first adhesive layer 10a and the second adhesive layer 10b. When the agent is in an uncured state, the dimensions can be adjusted and the assemblability can be improved. Further, since the permanent magnet 3 is not directly brought into contact with the fourth yoke 1d, it is possible to prevent damage due to an impact at the time of contact.

  Next, an electromagnetic actuator according to Embodiment 2 of the present invention will be described with reference to FIG. FIG. 2 is a cross-sectional view illustrating the configuration of the electromagnetic actuator according to the second embodiment of the present invention. The second embodiment differs from the first embodiment in the method of fixing the permanent magnet to the yoke. In FIG. 2, 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. 2, an annular seventh yoke 1g is fixed to the permanent magnet 3 via a third adhesive layer 10c, and the seventh yoke 1g is fixed to the fourth yoke 1d with a fourth adhesive layer 10d. It is fixed through. That is, one surface of the permanent magnet 3 is sandwiched between the sixth yoke 1f and the other surface is sandwiched between the seventh yoke 1g, and these are fixed to the fourth yoke 1d.

  Here, since the seventh yoke 1g suppresses an impact force when the permanent magnet 3 is attracted to the fourth yoke 1d, this is defined as an impact buffering yoke fixed to the permanent magnet 3. .

  According to the electromagnetic actuator of the second embodiment, in addition to the effects of the first embodiment, the permanent magnet 3 is fixed directly via the seventh yoke 1g without contacting the fourth yoke 1d. 3 can be further prevented.

  Next, an electromagnetic actuator according to Embodiment 3 of the present invention will be described with reference to FIG. FIG. 3 is a cross-sectional view illustrating the configuration of the electromagnetic actuator according to the third embodiment of the present invention. The third embodiment is different from the second embodiment in that a step is provided on the yoke and a permanent magnet is fixed. In FIG. 3, 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. 3, a circular step 11 is provided in the fourth yoke 1d, and a seventh yoke 1g to which the permanent magnet 3 is fixed is fitted into the step 11, and the fourth adhesive layer 10d is interposed therebetween. Are fixed. Compared to the inner diameter of the step 11, the outer diameter of the seventh yoke 1g is slightly smaller.

  According to the electromagnetic actuator of the third embodiment, in addition to the effects of the second embodiment, it is easy to align the seventh yoke 1g fixed to the permanent magnet 3, and the assemblability can be improved.

  In the third embodiment, the case where the seventh yoke 1g is fixed to the permanent magnet 3 has been described. However, even in the case where the permanent magnet 3 is directly fixed to the fourth yoke 1d as in the first embodiment, If the recessed step 11 is provided in the yoke 1d, the alignment of the permanent magnet 3 can be facilitated.

  Next, an electromagnetic actuator according to Embodiment 4 of the present invention will be described with reference to FIG. FIG. 4 is a cross-sectional view illustrating the configuration of the electromagnetic actuator according to the fourth embodiment of the present invention. The fourth embodiment differs from the second embodiment in that an alignment rod is provided on the permanent magnet and the yoke. 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 non-magnetic alignment rod 12 is fixed to the fourth yoke 1d, and the seventh yoke 1g, permanent magnet 3, and sixth yoke 1f are passed through the alignment rod 12. ing. The seventh yoke 1g, the permanent magnet 3, and the sixth yoke 1f are previously provided with through holes.

  According to the electromagnetic actuator of the fourth embodiment, in addition to the effects of the second embodiment, the alignment of the permanent magnet 3 becomes easy and the assemblability can be improved.

  In the fourth embodiment, the case where the seventh yoke 1g is fixed to the permanent magnet 3 has been described. However, even in the case where the permanent magnet 3 is directly fixed to the fourth yoke 1d as in the first embodiment, By providing the alignment rod 12 on the four yokes 1d, the alignment of the permanent magnet 3 can be facilitated.

  Further, instead of the alignment rod 12, the permanent magnet 3 or the like can be fixed to the fourth yoke 1d using a bolt as in the first embodiment.

DESCRIPTION OF SYMBOLS 1 Yoke 2 Armature 3 Permanent magnet 4 Closed coil 5 Opened coil 6 Operation rod 7 Bolt 10a 1st adhesive layer 10b 2nd adhesive layer 10c 2nd adhesive layer 10d 4th adhesive layer 11 Step 12 Alignment rod

Claims (6)

A yoke forming a magnetic path;
A magnetic armature that moves movably in the yoke;
A permanent magnet for moving or holding the armature;
A closed coil and an open coil for increasing or decreasing the magnetic flux in the yoke;
An electromagnetic actuator having a non-magnetic operating rod fixed to the armature and connected to a switch;
Providing a first adhesive layer on one surface of the permanent magnet and fixing it to the permanent magnet fixing yoke;
An electromagnetic actuator, wherein a second adhesive layer is provided on the other surface of the permanent magnet to fix an armature contact / separation yoke.   2. The electromagnetic actuator according to claim 1, wherein an impact buffering yoke is fixed to one surface of the permanent magnet, and the impact buffering yoke is fixed to the permanent magnet fixing yoke.   3. The electromagnetic actuator according to claim 1, wherein a concave step is provided in the permanent magnet fixing yoke, and the permanent magnet or the shock absorbing yoke is fitted into the step. 4.   The electromagnetic actuator according to any one of claims 1 to 3, wherein an alignment rod is provided in the permanent magnet fixing yoke, and the permanent magnet is passed through the alignment rod. A yoke forming a magnetic path;
A magnetic armature that moves movably in the yoke;
A permanent magnet for moving or holding the armature;
A closed coil and an open coil for increasing or decreasing the magnetic flux in the yoke;
An assembly method of an electromagnetic actuator having a non-magnetic operating rod fixed to the armature and connected to a switch,
First, apply an adhesive on one surface of the permanent magnet, and align and cure with the armature contacting / separating yoke when uncured,
Next, a method of assembling an electromagnetic actuator, wherein an adhesive is applied to the other surface of the permanent magnet, and is aligned with a permanent magnet fixing yoke in an uncured state and cured.   6. The method for assembling an electromagnetic actuator according to claim 5, wherein the armature contact / separation yoke and the permanent magnet fixing yoke are fixed to the permanent magnet and then magnetized.

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