JP2005353695A - Electromagnet - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To make the high-speed operation of a plunger by increasing an attraction force at a small current flow in an electromagnet. <P>SOLUTION: The fixed iron core 2 of the electromagnet 1 consists of a plurality of side legs 5 arranged between an upper iron core 3 and a lower iron core 4, and a central iron core leg 6 which is integrally formed with the upper iron core so as to be extended in a direction from the upper iron core 3 toward the lower iron core 4 between the side legs 5. The plunger 7 is passed through a passage 8 formed in the lower iron core opposite to the central iron core leg 6, and is connected and disconnected to the tip 6A of the central leg by magnetic attraction force. Inside the fixed iron core 2, a magnetic flux generating means 10 for magnetically driving the plunger is arranged. A cross-sectional area of the central iron core leg 6 is made larger than that of the plunger 7. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an electromagnet, and particularly relates to a center leg tip end portion of an electromagnet and a plunger that contacts the center leg tip end portion.

A conventional electromagnet (for example, Patent Document 1) includes a coil that is arranged in a fixed iron core and generates a magnetic flux, and the operation speed of the electromagnet depends on the number of turns of the coil. That is, even when a voltage is applied to the coil at the start, the current increases with time delay due to the inductance of the coil winding. The attraction force of the electromagnet is generated by current, and the attraction force increases while being delayed from the current. For this reason, the operation speed of the electromagnet (plunger or the like) depends on an increase in current, in other words, depends on the number of turns of the coil.
JP 2002-8498 A

  When an electromagnet suitable for high-speed operation is configured, it is necessary to reduce the inductance by reducing the number of turns of the coil in order to improve the rate of increase of the current. In order to obtain the required magnetomotive force (current × number of turns) of the coil, it is necessary to pass a large current through the coil.

  In order to flow a large current as described above, a large power source, a large cable, a coil winding with a large cross-sectional area for reducing resistance, an iron core having a large space for accommodating the coil winding with a large cross-sectional area, An iron core or the like having a large cross section corresponding to a long magnetic path length from the magnetoresistive surface must be formed to make an electromagnet having a large current and a large size.

  In a conventional electromagnet, the time from when a voltage is applied to the coil until the electromagnet (plunger or the like) starts (hereinafter referred to as a pre-start period) depends on the configuration (or operating conditions) as described above. It is almost constant, and it seems that there is no other way to fine-tune the pre-starting time period than to change the starting load force (load force required to start the electromagnet; hereinafter referred to as starting start force). It was. For this reason, in applications where the time before start-up is lengthened, for example, in the operation of breaking the circuit breaker, the breaker has a large short-circuit current (sinusoidal current) for direct current, in other words, a large short-circuit current with little attenuation. It was necessary to cut off, and a large circuit breaker was applied, and the cost was high.

  Furthermore, in the conventional electromagnet, the operation speed is changed by changing the current according to the fluctuation of the voltage. This change in operating speed changes in proportion to the voltage fluctuation. For this reason, in applications where it is desired that the fluctuation range of the operating speed be small, for example, when the circuit breaker is turned on and off, etc., if the difference between the maximum operating speed and the minimum operating speed is large, a wide range of conditions can be handled. It was necessary to increase the margin, and a large circuit breaker was applied, resulting in high costs.

  The present invention has been made based on the above problems, and it is an object of the present invention to provide a miniaturized electromagnet capable of reducing the current, increasing the attractive force, and operating the plunger at high speed.

  In order to solve the above-mentioned problems, the present invention according to claim 1 includes a first core portion (upper core portion in FIG. 1 and the like described later) and a second core portion (lower portion in FIG. 1 and the like described later). A central leg portion extending from the first iron core portion toward the second iron core portion with respect to the first iron core portion between the side leg portions. A fixed iron core, a plunger that passes through a passage portion provided in the second iron core portion and contacts and separates by a magnetic attraction force with respect to a distal end portion of a central leg, and the plan arranged in the fixed iron core The present invention relates to an electromagnet having magnetic flux generating means for magnetically driving a jar. And the cross-sectional area of the said center leg part was made larger than the cross-sectional area of the said plunger, It is characterized by the above-mentioned.

  The invention according to claim 2 includes a plurality of side legs disposed between the first core part and the second core part, and the first core part with respect to the first core part between the side legs. Passes through a fixed core having a central leg extending in the direction of the second iron core, and a passage provided in the second iron core, and contacts and separates from the tip of the central leg by a magnetic attractive force. The present invention relates to an electromagnet having a plunger that performs the above operation and a magnetic flux generating means that is disposed in the fixed iron core and magnetically drives the plunger. And while making the cross-sectional area of the said center leg part larger than the cross-sectional area of the said plunger, the said channel | path part was provided with respect to the 2nd iron core part which wraps with a center leg part.

  The invention according to claim 3 is provided with a plurality of side legs disposed between the first core part and the second core part, and the first core part with respect to the first core part between the side legs. Passes through a fixed core having a central leg extending in the direction of the second iron core, and a passage provided in the second iron core, and contacts and separates from the tip of the central leg by a magnetic attractive force. The present invention relates to an electromagnet having a plunger that performs the above operation and a magnetic flux generating means that is disposed in the fixed iron core and magnetically drives the plunger. And the cross-sectional area of the said center leg part is made wider than the cross-sectional area of the said plunger, The said channel | path part is provided with the projection part provided so that it may wrap with a center leg part with respect to the 2nd iron core part by the side of an insertion port. And a recess having a diameter larger than the diameter on the insertion port side provided to the second iron core near the outlet side of the passage portion.

  The invention according to claim 4 is the invention according to claim 3, wherein the passage portion is provided with respect to the second iron core portion between the vicinity of the outlet side of the passage portion and the magnetic flux generation means. A recess having a diameter larger than the diameter of the insertion port, and a projection that is provided on the second iron core portion on the insertion port side of the passage portion adjacent to the recess and protrudes so as to wrap with the central leg. It is characterized by that.

  The invention according to claim 5 includes a plurality of side legs disposed between the first core part and the second core part, and the first core part with respect to the first core part between the side legs. Passes through a fixed core having a central leg extending in the direction of the second iron core, and a passage provided in the second iron core, and contacts and separates from the tip of the central leg by a magnetic attractive force. The present invention relates to an electromagnet having a plunger that performs the above operation and a magnetic flux generating means that is disposed in the fixed iron core and magnetically drives the plunger. And the weight which adjusts the starting start time (for example, the length of the time before starting) of this plunger was provided with respect to the said plunger, It is characterized by the above-mentioned.

  In the present invention, by setting the cross-sectional area of the central leg portion to be larger than the cross-sectional area of the plunger, the position at which the plunger starts to be started (hereinafter referred to as the starting start position) is set near the second iron core portion, During the pre-start period, a large amount of leakage magnetic flux that does not become the attraction force of the electromagnet is generated, and the effective magnetic flux that becomes the attraction force is reduced, so that the start current (current for starting the plunger) is the highest in the coil during the first half of the start. Start-up can be delayed until a predetermined percentage of power (eg, a value of about 70% or more of maximum power) is reached.

  The cross-sectional area of the center leg is changed to a plunger so that the leakage magnetic flux stored until the magnetomotive force reaches a sufficient level in the pre-starting period is quickly changed to an effective magnetic flux after starting (after the pre-starting period). By making the structure wider than the cross-sectional area, the leakage magnetic flux accumulated during the first period of start-up can be quickly changed to an effective magnetic flux and a large attractive force can be obtained. A large electromagnet capable of operating the plunger at high speed can be obtained.

  Regarding the time before the start, the effective magnetic flux amount is increased or decreased when making a large adjustment, and the starting force is changed when making a fine adjustment (for example, attaching and detaching a weight 7E described later, By changing the starting force by changing the weight or the like, it is possible to perform delay adjustment in a stepwise manner (for example, stepwise in minute time units) over a wide range.

  Furthermore, since the start of a constant starting current is used regardless of voltage fluctuations, and the leakage magnetic flux that quickly changes to an effective magnetic flux after the start of the start is used, the rate of change in operating speed that can be caused by voltage fluctuations can be reduced. .

  As described above, according to the electromagnet of the present invention, since the operation does not depend on the inductance of the coil winding, the number of turns of the coil can be increased with respect to the required magnetomotive force to reduce the current. For example, when producing a small-sized electromagnet that operates at a high speed with a small current (a so-called small current delay high-speed electromagnet), a small power source, a small cable, and a small resistance that may increase the resistance due to a decrease in current. This can be achieved by configuring a coil winding with a small area, an iron core having a small space for accommodating the coil winding with the small cross-sectional area, and an iron core having a small cross section corresponding to a short magnetic path length from the magnetoresistive surface. .

  Since the electromagnet of the present invention can be adjusted by attaching / detaching a weight (for example, a weight attached to a plunger) with respect to the time before the start-up, the electromagnet is applied to an application requiring such adjustment, for example, a breaking operation of a circuit breaker. In this case, by delaying the start-up, it is sufficient to cut off the short-circuit current with a small amount of direct current in the breaker. Therefore, the circuit breaker can be downsized (for example, downsized by about 20%). Is possible.

  Furthermore, since the rate of change in operating speed due to voltage fluctuation can be reduced compared to conventional electromagnets, it can be used in applications where it is desired to have a small operating speed fluctuation range, such as circuit breaker on / off operation (narrow). Because it is possible to cope with the fluctuation range of the operation speed of the fluctuation range being narrow), the margin can be reduced, and it is possible to reduce the size and cost.

  Hereinafter, an electromagnet according to an embodiment of the present invention will be described in detail with reference to the drawings.

[Example 1]
First, Example 1 of the electromagnet in the present embodiment will be described. FIG. 1 illustrates a cross section of the electromagnet 1 of this embodiment, and FIG. 2 is a cross sectional view of a detailed portion of FIG. In the fixed iron core 2, side leg portions (or a plurality of side leg portions) 5A and 5B are provided between the upper iron core portion 3 and the lower iron core portion 4 facing each other, and the side leg portions 5A and the side leg portions are provided. A central core leg portion 6 extending from the upper core portion 3 toward the lower core portion 4 is provided in the upper core portion 3 between 5B. A passage 8 for allowing the plunger 7 to pass therethrough is formed in the lower iron core 4 facing the central iron leg 6. The plunger 7 passes through the passage portion 8 and comes into contact with and separates from the center leg tip end portion 6A, and the cross-sectional area S1 of the central iron core leg portion 6 is formed larger than the cross-sectional area S2 of the plunger 7. .

  An upper rod 7A and a lower rod 7B are provided at the upper end portion and the lower end portion of the plunger 7, and the upper rod 7A is inserted into a through-hole 7C penetrating the central core leg portion 6 and the upper iron core portion 3, and inside the plunger 7 An upper or lower screw groove 7D is attached to the through-hole drilled in. An upper rod 7A is attached to the upper screw groove 7D, and a bolt 7F is attached to the lower screw groove 7D via a weight 7E. With such a configuration, the rods 7A and 7B are attached to the plunger 7. Therefore, the operating speed of the plunger 7, that is, the operating time can be adjusted by attaching / detaching the bolt 7F to adjust the weight of the weight 7E (or by adjusting the weight of the weight 7E itself). .

  The electromagnet 1 is configured by arranging the coil 10 in the fixed iron core 2 as described above. In the coil 10, a means in which a part thereof is replaced with a permanent magnet may be used as appropriate. That is, various means may be appropriately applied to the coil 10 as long as it is a means for generating magnetic flux.

  The passage portion 8 is formed so as to wrap with the central core leg portion 6 with respect to the lower iron core portion 4, and the insertion port side diameter D1 of the passage portion 8 is formed smaller than the outlet side diameter D2. That is, the size of the insertion port side diameter D <b> 1 is determined by the protruding portion 4 </ b> A protruding from a part of the lower iron core portion 4 toward the passage portion 8. The protrusion 4A protrudes so as to wrap with the central core leg 6 and forms (partially forms) the passage 8 described above.

  In the plunger 7, as shown in FIG. 2, the start start position S in the period before the start of the plunger 7 is arranged in the vicinity of the lower iron core portion 4. In addition, in the starting start position S of a present Example, it is located below the lower iron core part inner surface 4B facing the center iron core leg front-end | tip part 6A. Here, the vicinity of the lower iron core portion 4 indicates a range from the vicinity of the position of the inner side surface 4B of the lower iron core portion facing the central iron core leg tip portion 6A to the vicinity of the protruding portion 4A side of the passage portion 8. In this range, adjustment is made so that the start start position S of the plunger 7 is located.

  Next, the operation of the electromagnet 1 configured as described above will be described with reference to FIGS.

  First, when the coil 10 is energized (applied with a voltage) with the plunger 7 set at the start start position S, the magnetic flux Φ1 becomes the lower iron core portion 4 (4A) -plunger 7-center as shown in FIG. The magnetic circuit formed in the iron core leg part 6-upper iron core part 3-side leg parts 5A, 5B-lower iron core part 4 (4A) is circulated. Further, the leakage magnetic flux Φ2 circulating in the magnetic circuit leaks to the central core leg 6.

  Thereafter, as shown in FIG. 4, when the plunger 7 is slightly moved from the starting start position S, the leakage magnetic flux [Phi] 2 is lower core part 4 (4A) -plunger 7-central core leg part 6-upper core part 3-side leg. Part 5A, 5B—Starts flowing through the magnetic circuit formed in the lower iron core part 4 (4A).

  In the period from the state shown in FIG. 4 to the state shown in FIG. 5, most of the leakage magnetic flux Φ2 starts to flow to the magnetic circuit via the plunger 7 and changes to an effective magnetic flux similar to the magnetic flux Φ1. To do.

  That is, in order to delay the start of the electromagnet 1 until the start current in the pre-start period becomes a certain value or more (for example, a value of about 70% or more) with respect to the maximum current of the coil 10, the effective magnetic flux is reduced. Increase leakage flux. Further, by performing attachment and detachment of the weight 7E, etc., fine adjustment is performed by changing the magnitude of the starting start force.

  With the configuration for adjusting the magnetic flux as described above, the attractive force and time required for starting can be greatly adjusted. Further, for fine adjustment, by changing the starting force by attaching / detaching the weight 7E, etc., it is possible to easily perform stepwise adjustment (for example, stepwise in minute time units) over a wide range.

  By making the central core leg 6 longer (longer in the axial direction of the plunger 7) and setting the start start position S of the plunger 7 near the lower core 4, the leakage flux Φ 2 is generated in the space of the coil 10. Occur. The leakage magnetic flux Φ2 is generated more by increasing the space height of the coil 10 and decreasing the thickness.

  For the leakage magnetic flux Φ2, no force acts on the attractive force side of the plunger 7. The effective magnetic flux serving as the attractive force is a magnetic flux Φ1 generated between the central iron core leg portion 6 and the plunger 7, and is smaller than the leakage magnetic flux Φ2. For this reason, in order for the attraction force to reach a predetermined start start force, the start start must be delayed until the start current reaches a predetermined value. As a specific example, until the starting current reaches a certain value or more (for example, a value of about 70% or more) with respect to the maximum current of the coil 10 in the pre-starting period, the starting start is delayed by attaching / detaching the weight 7E. .

  After the start of the start, the leakage flux Φ2 generated between the lower end of the central core leg portion 6A and the lower core portion 4 changes the balance of the magnetic resistance due to the movement of the plunger 7, and the leakage flux Φ2 itself The flow is changed between the central core leg 6 and the plunger 7 where the magnetic resistance becomes smaller, that is, the magnetic flux changes to an effective magnetic flux as an attractive force, and the attractive force increases. At this time, the flow of the leakage flux Φ2 is changed more rapidly as the leakage flux Φ2 is closer between the central core leg 6 and the plunger 7.

  In other words, in the electromagnet 1, the start start position S of the plunger 7 is adjusted so as to be positioned in the vicinity of the lower iron core portion 4, or the recess 20 of the lower iron core portion 4 (see, for example, FIG. 7; leakage magnetic flux is controlled. For this purpose, a flow of the leakage magnetic flux Φ2 can be quickly changed by providing a recess for intentionally forming a gap between the lower iron core portion 4 and the plunger 7.

  As described above, according to the present embodiment, the leakage flux Φ2 frequently generated between the vicinity of the central core leg tip 6A and the lower core 4 changes the balance of the magnetic resistance due to the movement of the plunger 7, and more The flow is changed between the central core leg portion 6 and the plunger 7 where the magnetic resistance is reduced, and the magnetic flux is changed to an effective magnetic flux as an attractive force. By making the cross-sectional area S1 of the central core leg 6 larger than the cross-sectional area S2 of the plunger 7 so that this effective magnetic flux is attracted more (attracted by the plunger 7), the attraction force increases. Leakage magnetic flux Φ2 changes to an effective magnetic flux similar to magnetic flux Φ1. The electromagnet 1 can be reduced in size by the increase in the attraction force.

  In particular, by making the cross-sectional area S1 of the central core leg 6 larger than the cross-sectional area S2 of the plunger 7, more effective magnetic flux from the plunger 7 is absorbed by the central core leg 6 and the attractive force is further increased. Therefore, the electromagnet 1 can be further downsized.

  Further, the protrusion 4A is configured to wrap with the central core leg 6 so that more effective magnetic flux is concentrated on the plunger 7, and the collected effective magnetic flux is more concentrated on the central core leg 6. By making the cross-sectional area S1 of the central core leg 6 larger than the cross-sectional area S2 of the plunger 7 so as to be absorbed, the suction force is further increased.

  Here, the relationship between the energization time T of the electromagnet 1 and the effective magnetic flux amount Φ will be described based on the magnetic characteristic diagram of FIG. In the magnetic characteristics of the electromagnet according to the prior art, as shown by the curve ΦA, the magnetic flux increases approximately proportionally to about 70% of the magnetic flux amount at the maximum current of the coil 10, but then saturates. In this case, the time when the effective magnetic flux amount becomes a value corresponding to the starting start force (that is, the time when the effective magnetic flux amount reaches a value at which the effective magnetic flux amount can be started (time when φp in FIG. 6); hereinafter referred to as the start start time) t1 Is within the proportional increase region.

  On the other hand, in the magnetic characteristics of the electromagnet 1 of the present embodiment, as shown by the curve ΦB, the amount of effective magnetic flux is small because the leakage magnetic flux Φ2 is accumulated during the first half of the start, and the effective magnetic flux at the time t1 in the conventional electromagnet. The effective magnetic flux gradually increases from the time t1 to the time t2 delayed from the time t1, and the leakage magnetic flux Φ2 rapidly changes to the magnetic flux Φ1 after the time t2, so that the effective magnetic flux amount is Increases rapidly. The time t2 delayed as described above can be easily adjusted (for example, adjusted by attaching / detaching the weight 7E) by the weight 7E provided on the plunger 7. This adjustment can be performed without being affected by the values of S1 and S2.

  As described above, by delaying the start start time from time t1 to time t2, the balance of the leakage magnetic flux Φ2 changes according to the movement of the plunger 7, and the central core leg 6 having a smaller magnetic resistance is obtained. When the flow is changed between the plunger 7 and the leakage magnetic flux Φ2 is changed to an effective magnetic flux that is an attractive force, the magnetic flux Φ1 increases rapidly, and the attractive force increases. For this reason, after the time t2 of each curve in FIG. 6, the curve ΦB indicating the magnetic characteristics of the present embodiment has an effective amount of magnetic flux (that is, the magnetic flux Φ1) is sharper than the curve ΦA indicating the magnetic characteristics of the prior art. It has been increased.

  As is apparent from the characteristic diagram of FIG. 6, the gradient αB of the curve ΦB indicating the magnetic characteristics of the present embodiment is larger than the gradient αA of the curve ΦA indicating the magnetic characteristics of the prior art. It can be seen that the operating speed of the electromagnet 1 can be increased in accordance with the change in the attractive force.

  Further, for example, when the circuit breaker is turned on and off by the electromagnet 1 of this embodiment, the start-up period is longer than that of the electromagnet according to the prior art (in FIG. Since the start time of the electromagnet 1 of this embodiment is t2 in contrast to t1, the current value is particularly small when the short-circuit current is interrupted (for example, a small current value with a reduced DC component). However, since it can operate | move, the structure of the electromagnet 1 and the operation device of a circuit breaker, etc. can be reduced in size.

  Furthermore, in this embodiment, the central core leg tip end portion 6A is extended to the vicinity of the inner surface 4B of the lower core portion (for example, extended in the axial direction of the plunger 7). Since the weight of the plunger 7 can be reduced compared with the case where it is provided in the vicinity of the iron core 3, the plunger 7 can be operated with a smaller electromagnetic force.

  Furthermore, in this embodiment, regardless of the applied voltage of the electromagnet (for example, regardless of the magnitude of the applied voltage), the attractive force is increased by changing the leakage magnetic flux Φ2 to the effective magnetic flux Φ1 after starting. Therefore, for example, when applied to an operating device for a circuit breaker, fluctuations in the operating speed of the circuit breaker due to fluctuations in operating power can be reduced.

[Example 2]
Next, Example 2 of the electromagnet in the present embodiment will be described. In addition, the same code | symbol etc. are used for the same thing as Example 1, and the detailed description etc. are abbreviate | omitted suitably. In this embodiment, as shown in FIGS. 7 and 8, the lower core portion 4 near the insertion opening of the passage portion 8 is provided with a protruding portion 4A that protrudes so as to wrap with the central core leg portion 6. A recess 20 having a diameter D2 larger than the diameter D1 of the passage portion insertion opening is provided for the lower core portion 4 near the outlet of the passage portion 8. That is, the passage portion 8 is composed of the protruding portion 4A and the recessed portion 20.

  Since the recessed portion 20 is provided as in the present embodiment, a large amount of leakage magnetic flux Φ2 flows to the plunger 7 via the protrusion 4A. Therefore, the plunger 7 and the tip portion 6A (the leakage magnetic flux Φ2 passes). The difference in magnetoresistance with the tip 6A) becomes clear, and the passage through which the magnetic flux Φ1 and the leakage magnetic flux Φ2 are transmitted can be distinguished. For example, the yield is reduced (for example, performance variation) due to an electromagnet manufacturing error. Can be minimized.

  When the recess 20 is provided, a protrusion 4A protruding so as to wrap with the central core leg 6 is provided to the lower core 4 on the insertion opening side, and the inner surface of the protrusion 4A to the coil 10 is provided. The recess portion 20 is provided for the lower iron core portion 4 in the vicinity of the outlet.

  According to the configuration in which the recess 20 is provided in this way, the magnetic flux Φ1 is difficult to leak to the central core leg tip 6A by the recess 20, and the leaked magnetic flux Φ2 passes through the protrusion 4A to the plunger 7. Therefore, the effective magnetic flux in the plunger 7 is further increased, resulting in an increase in attractive force, and the electromagnet can be reduced in size.

As described above, according to the present embodiment, by changing the leakage magnetic flux Φ2 to the effective magnetic flux that is the magnetic flux Φ1, the attractive force is increased with a small current, and a miniaturized electromagnet, circuit breaker, and the like are manufactured ( For example, a so-called small current delay high-speed operation electromagnet can be manufactured. As described above, in the present invention, only the specific example described has been described in detail, but various modifications and corrections are possible within the scope of the technical idea of the present invention. It is obvious to those skilled in the art that such variations and modifications are within the scope of the claims.

The longitudinal cross-sectional view of the electromagnet (Example 1) which concerns on this Embodiment. The fragmentary sectional view of the lower iron core part vicinity of the electromagnet in FIG. The figure which shows magnetic flux distribution in the magnetic circuit of FIG. The figure which shows the change condition of the magnetic flux distribution in the magnetic circuit of FIG. The figure which shows the change condition of the magnetic flux distribution in the magnetic circuit of FIG. The magnetic characteristic figure which shows the relationship between the operation time of the plunger of the electromagnet in FIG. 1, and magnetic flux. The longitudinal cross-sectional view (and figure which shows magnetic flux distribution attachment) of the electromagnet (Example 2) which concerns on this Embodiment. The partial expanded sectional view at the time of cross-sectioning the lower iron core part and plunger of FIG.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Electromagnet, 2 ... Fixed iron core, 3 ... Upper iron core part, 4 ... Lower iron core part, 4A ... Projection part, 4B ... Inner side surface of lower iron core part, 5A, 5B ... Side leg part, 6 ... Central iron core leg part, 6A ... Center iron core leg tip, 7 ... plunger, 7A ... upper rod, 7C ... through hole, 8 ... passage section, 10 ... coil, D1 ... diameter on the inlet side, D2 ... outlet side diameter, S ... start start position .

Claims (5)

A plurality of side leg portions disposed between the first core portion and the second core portion, and extending from the first core portion toward the second core portion relative to the first core portion between the side leg portions. A fixed iron core with a central leg,
A plunger that passes through a passage portion provided in the second iron core portion and contacts and separates by a magnetic attraction force with respect to a distal end portion of the central leg portion;
A magnetic flux generating means disposed in the fixed iron core and magnetically driving the plunger,
An electromagnet characterized in that a cross-sectional area of the central leg portion is made larger than a cross-sectional area of the plunger. A plurality of side leg portions disposed between the first core portion and the second core portion, and extending from the first core portion toward the second core portion relative to the first core portion between the side leg portions. A fixed iron core with a central leg,
A plunger that passes through a passage portion provided in the second iron core portion and contacts and separates by a magnetic attraction force with respect to a distal end portion of the central leg portion;
A magnetic flux generating means disposed in the fixed iron core and magnetically driving the plunger,
An electromagnet characterized in that a cross-sectional area of the central leg portion is made larger than a cross-sectional area of the plunger, and the passage portion is provided with respect to a second iron core portion that wraps with the central leg portion. A plurality of side leg portions disposed between the first core portion and the second core portion, and extending from the first core portion toward the second core portion relative to the first core portion between the side leg portions. A fixed iron core with a central leg,
A plunger that passes through a passage portion provided in the second iron core portion and contacts and separates by a magnetic attraction force with respect to a distal end portion of the central leg portion;
A magnetic flux generating means disposed in the fixed iron core and magnetically driving the plunger,
The cross-sectional area of the central leg is wider than the cross-sectional area of the plunger;
The passage portion is provided with respect to a second iron core portion near the outlet side of the passage portion and a projection provided so as to wrap with a central leg portion with respect to the second iron core portion on the insertion port side. An electromagnet comprising a recess having a diameter larger than a diameter on the side. The passage portion is provided with respect to the second iron core portion between the vicinity of the outlet side of the passage portion and the magnetic flux generation means, and has a recess having a diameter larger than the diameter of the insertion port of the passage portion;
The electromagnet according to claim 3, further comprising: a protrusion provided on the second iron core portion on the insertion opening side of the passage portion adjacent to the recess portion and protruding so as to wrap with the central leg portion. A plurality of side leg portions disposed between the first core portion and the second core portion, and extending from the first core portion toward the second core portion relative to the first core portion between the side leg portions. A fixed iron core with a central leg,
A plunger that passes through a passage portion provided in the second iron core portion and contacts and separates by a magnetic attraction force with respect to a distal end portion of the central leg portion;
A magnetic flux generating means disposed in the fixed iron core and magnetically driving the plunger,
An electromagnet comprising a weight for adjusting a start time of the plunger for the plunger.

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