JP2010003754A - Polarized electromagnet - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a polarized electromagnet wherein wearing at the part of abutting is suppressed by reducing friction by allowing an attracting force acting in the direction opposite to gravity to act on a movable iron core when a coil spool abuts with an iron core rod under the gravity acting on the movable iron core. <P>SOLUTION: A movable iron core 7 with a second arm 7c is slidably inserted into an electromagnetic coil 2 formed by winding a conductive wire in cylinder, in the axial direction of the electromagnetic coil 2. The electromagnetic coil 2 is pinched between an upper side fixing core 3 and a lower side fixing core 4, comprising end plates 3a and 4a, respectively, and the end plates 3a and 4a are arranged to counter one end of the electromagnetic coil 2 across a space. A permanent magnet 5 is provided on the upper side of the upper side fixing core 3, and a magnetic pole plate 6 comprising a side plate 6a extending in axial direction of the electromagnetic coil 2 and an end plate 6b opposed to one end of the electromagnetic coil 2 across a space is provided on the upper side of the permanent magnetic 5. The distance from the second arm 7c to the upper side fixing core 3 is shorter than that to the lower side fixing core 4. The distance from a movable rod 7a to the end plate 3a is shorter than that to the end plate 4a. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a polarized electromagnet that is applied to an electromagnetic contactor or the like and includes a permanent magnet and an electromagnetic coil.

  The magnetic contactor is disposed on a control panel for controlling a machine tool or the like, for example. An example of an external view of the magnetic contactor is shown in FIG. The electromagnetic contactor 400 may be installed in such a posture that the leg portion 401 faces a wall surface or the like and the wiring portion 402 protrudes horizontally from the wall. In this case, for example, since the direction of arrow A in FIG. 12A is downward, gravity acts on the electromagnetic contactor 400 in the direction of arrow A.

  Next, the electromagnetic contactor 400 is cut along the alternate long and short dash line B in FIG. 12A, and a longitudinal sectional view when viewed from the direction of the arrow C is shown in FIG. A portion surrounded by a dotted line 403 in FIG. 12B is a polarized electromagnet. Hereinafter, a figure corresponding to a portion surrounded by a dotted line 403 is a central longitudinal sectional view of the electromagnetic contactor.

  A conventional polarized electromagnet 500 will be described with reference to FIG. 13 which is a central longitudinal sectional view. A conventional polarized electromagnet 500 includes an electromagnetic coil 502 configured by winding a conductive wire such as a copper wire in a cylindrical shape on a coil spool 501 having a first flange 501a and a second flange 501b at both ends of a cylinder. The cross-section is U-shaped, and the first end plate portion 503a is opposed to the first flange 501a in the vicinity, while the second end plate portion 503b is separated from the second flange 501b and opposed to the first flange 501b. A pair of fixed iron cores 503 in which electromagnetic coils 502 are arranged so that the side plate portions 503c are close to the outer periphery of the coil spool 501; a pair of permanent magnets 504 arranged on the outside of the side plate portions 503c of the fixed iron core 503; Is formed in an L shape, the side plate portion 505a is disposed outside the permanent magnet 504, and the end plate portion 505b is separated from the first end plate portion 503a and opposed to the first end plate portion 503a. 5 and a first arm 506b positioned between the first end plate portion 503a and the end plate portion 505b is provided at one end of the iron core rod 506a inserted through the electromagnetic coil 502, while the first arm 506b is provided at the other end of the iron core rod 506a. And a movable iron core 506 provided with a second arm 506c located between the second flange 501b and the second end plate portion 503b. In the conventional polarized electromagnet 500, the magnetic flux generated by the permanent magnet 504 flows as indicated by a broken line arrow 507, and the magnetic flux generated by the electromagnetic coil 502 flows as indicated by a solid line arrow 508, for example.

Japanese Patent Laying-Open No. 2007-207777 (FIG. 4)

  The conventional poled electromagnet 500 works on the movable iron core 506 in a regular attachment state of the magnetic contactor, that is, in a state where the magnetic contactor is attached to the control panel or the like in a posture in which gravity acts in the direction of arrow A in FIG. The coil spool 501 and the iron core 506a come into contact with each other due to gravity. When the movable iron core 506 is driven, the coil spool 501 and the iron core rod 506a slide, and the abutting portion is worn. As a result, the frictional force between the coil spool 501 and the iron core rod 506a is increased, and the movable iron core 506 is restrained by the coil spool 501, and the driving becomes impossible or the driving becomes difficult. There was a problem of causing the malfunction of.

The polarized electromagnet according to the present invention is inserted into a coil formed by winding a conductive wire in a cylindrical shape so that the movable iron core is slidable in the coil axis direction, and the fixed body is provided inside the coil. In the polarized electromagnet comprising a permanent magnet outside the fixed body and a magnetic pole plate having a side portion extending in the coil axial direction outside the permanent magnet and an end portion facing away from one end of the coil.
The magnetic force in the direction opposite to the gravitational force is larger than the magnetic force in the gravitational direction acting on the movable iron core.

  According to the present invention, a suction force acting in a direction opposite to the gravity can be applied to the movable iron core, so that friction with the coil spool caused by driving the movable iron core is reduced. Wear can be suppressed, and malfunction of the magnetic contactor can be reduced. As a result, for example, there is an effect that the life of the device can be extended.

Hereinafter, the present invention will be specifically described with reference to the drawings showing embodiments thereof.
Embodiment 1 FIG.
1 to 3 are central longitudinal sectional views showing the polarized electromagnet 100 in the normal mounting state in the first embodiment. FIG. 1 shows a state before the polarized electromagnet 100 is excited, and FIG. FIG. 3 shows a state immediately after the polarized electromagnet 100 is excited and before the movable iron core is displaced, and FIG. 3 shows a state where the polarized electromagnet 100 is excited and the movable iron core is being displaced. In the present application, the downward direction refers to the direction in which gravity works when the electromagnetic contactor is in the regular attachment state, and the lower side refers to the downward direction side. On the other hand, upward refers to the opposite direction of the downward direction, and upper refers to the upward direction.

  As shown in FIG. 1, a polarized electromagnet 100 according to Embodiment 1 includes a coil spool 1 having a first flange 1a and a second flange 1b at both ends of a cylinder, and a conductive wire such as a copper wire in a cylindrical shape. The electromagnetic coil 2 is formed by being wound. The coil spool 1 is sandwiched from above and below by an upper fixed core 3 and a lower fixed core 4 that are fixed bodies having a pair of upper and lower cross-sections that are U-shaped and plate-shaped. The upper fixed iron core 3 and the lower fixed iron core 4 have first end plate portions 3a and 4a which are end portions facing each other close to the first flange 1a, respectively, while second end plate portions 3b and 4b, respectively. Are opposed to the second flange 1b, and side plate portions 3c and 4c which are side portions extending in the coil axial direction are close to the outer peripheral portion of the coil spool 1, sandwiching the coil spool 1 from above and below, and electromagnetic coil 2 Is arranged inside.

  In the side plate portion 3 c of the upper fixed iron core 3, a permanent magnet 5 is disposed outside the upper side, and a magnetic pole plate 6 having an L-shaped cross section is disposed above the permanent magnet 5. In the magnetic pole plate 6, a side plate portion 6a that is a side portion extending in the coil axis direction is disposed on the upper side of the permanent magnet 5, and an end plate portion 6b that is an end portion is provided with a first flange 1a, a first end plate portion 3a, and It is spaced apart from 4a. The iron rod 7a inserted through the coil spool 1 is provided with a first arm 7b positioned between the first end plate portions 3a and 4a and the end plate portion 6b at one end and further at the other end. A movable iron core 7 is configured by providing a second arm 7c which is a movable piece located between the second flange 1b and the second end plate portions 3b and 4b.

  In the polarized electromagnet 100, when the electromagnetic contactor is in the regular attachment state, the direction of the arrow D in FIG. For this reason, gravity works in the direction of arrow D. And the electromagnetic coil 2 and the movable iron core 7 are extended in the horizontal direction. The movable iron core 7 is always urged in the direction of arrow E, which is the horizontal direction, by a return spring (not shown). That is, in a state where the electromagnetic coil 2 is not excited, the first arm 7b and the end plate portion 6b are adsorbed.

  Next, operation | movement of the polarized electromagnet 100 in Embodiment 1 is demonstrated using FIGS. 1-3. FIG. 1 is a central longitudinal sectional view showing a state before the polarized electromagnet 100 is excited. In FIG. 1, the magnetic flux 8 of the permanent magnet 5 circulates in the order of the magnetic pole plate 6 → the first arm 7 b → the iron core rod 7 a → the upper fixed iron core 3 as indicated by the one-dot chain line arrow. Since the electromagnetic coil 2 has not been excited yet, no magnetic flux due to the electromagnetic coil 2 is generated. Moreover, in Embodiment 1, since the permanent magnet is not provided under the lower fixed iron core 4, unlike the prior art, there is no magnetic flux of the lower permanent magnet.

  In FIG. 1, due to the magnetic flux 8, an attractive force acts between the first arm 7 b and the end plate portion 6 b of the magnetic pole plate 6. In the movable iron core 7, the first arm 7 b is attracted to the end plate portion 6 b by the combined force of the force biased by the return spring and the attractive force of the magnetic flux 8, and the return state is maintained. At this time, a suction force also acts in a gap g1 indicated by a broken line between the iron core 7a and the upper fixed iron core 3, so that the iron core 7a receives an upward force.

  Next, the operation of the polarized electromagnet 100 immediately after the electromagnetic coil 2 is excited will be described with reference to FIG. When the electromagnetic coil 2 is excited, a magnetic flux 9 indicated by a solid arrow in FIG. 2 is generated. The magnetic flux 9 circulates in the order of iron core 7a → first arm 7b → upper fixed iron core 3 or lower fixed iron core 4 → second end plate portion 3b or 4b → second arm 7c. And the second magnetic flux 9b that circulates in the order of the iron core rod 7a → the first arm 7b → the magnetic pole plate 6 → the permanent magnet 5 → the upper fixed iron core 3 → the second arm 7c.

  Between the first arm 7b and the end plate portion 6b, the magnetic flux 8 caused by the permanent magnet 5 and the second magnetic flux 9b caused by the electromagnetic coil 2 are in a direction to cancel each other. For this reason, the attractive force which acts between the 1st arm 7b and the end plate part 6b becomes smaller than the non-excitation state shown in FIG. On the other hand, a large attractive force is generated by the magnetic flux 9 between the second arm 7 c and the second end plate portions 3 b and 4 b of the upper fixed iron core 3 and the lower fixed iron core 4. When the suction force becomes larger than the suction force between the first arm 7b and the end plate portion 6b, the movable iron core 7 starts to be displaced in the direction of the arrow d in FIG.

  Even in the state immediately after the electromagnetic coil 2 shown in FIG. 2 is excited, an attractive force acts in the gap g1 between the iron core bar 7a and the upper fixed iron core 3. Therefore, the iron core 7a receives an upward force.

  When the electromagnetic coil 2 is excited and the movable iron core 7 starts to be displaced in the direction of the arrow d, it is between the second arm 7c and the second end plate portions 3b and 4b of the upper fixed iron core 3 and the lower fixed iron core 4. Therefore, the magnetic resistance is reduced. Then, the magnetic flux flowing through the gap increases and the attractive force further increases, and the movable iron core 7 is more strongly attracted in the direction of the arrow d. When the movable iron core 7 is displaced in the direction of the arrow d, the first arm 7b and the end plate portion 6b are separated from each other, so that the magnetic flux 8 is reduced but not lost. That is, the suction force between the iron core 7a acting on the gap g1 and the upper fixed iron core 3 is also weakened but not lost. Therefore, the iron core 7a continues to receive upward force.

  As a result of the movable iron core 7 being displaced in the direction of the arrow d, the second end plate portions 3b and 4b of the upper fixed iron core 3 and the lower fixed iron core 4 and the second arm 7c are adsorbed. FIG. 3 is a central longitudinal sectional view of the polarized electromagnet 100 immediately before the second arm 7c is attracted to the end plate portions 3b and 4b. As shown in FIG. 3, the suction force between the iron core 7a acting on the gap g1 and the upper fixed iron core 3 is not lost until just before the adsorption, and the iron core 7a receives an upward force.

  As described above, in the polarized electromagnet 100 according to the first embodiment, due to the magnetic flux generated by the permanent magnet 5, in the series of operations of the polarized electromagnet 100, upward force on the movable iron core 7, that is, the direction opposite to gravity. The power of can be worked. Thereby, friction between the iron core rod 7a and the coil spool 1 due to the weight of the movable iron core 7 can be reduced, and smooth sliding between the coil spool 1 can be realized.

Embodiment 2. FIG.
Next, a second embodiment will be described. 4 to 6 are central longitudinal sectional views showing the polarized electromagnet 100 in the normal mounting state in the second embodiment. FIG. 4 shows a state before the polarized electromagnet 100 is excited, and FIG. FIG. 6 shows a state immediately after the polarized electromagnet 100 is excited and before the movable iron core 7 is displaced, and FIG. 6 shows a state after the polarized electromagnet 100 is excited and the movable iron core 7 is displaced.

  As shown in FIG. 4, the poled electromagnet 100 according to the second embodiment has a permanent magnet 50 disposed outside the lower side plate portion 4 c of the lower fixed iron core 4 and a cross section below the permanent magnet 50. A L-shaped magnetic pole plate 60 is disposed. In the magnetic pole plate 60, the side plate portion 60a is disposed below the permanent magnet 50, and the end plate portion 60b is spaced apart from the first end plate portion 4a. In other words, the second embodiment is the same as the conventional configuration in that permanent magnets are provided at the upper and lower portions of the polarized electromagnet 100.

  On the other hand, the second arm 7 c included in the movable iron core 7 is configured such that the gap G 1 between the upper fixed core 3 and the gap G 0 between the lower fixed iron core 4 and the lower fixed iron core 4 has a shorter distance. . 4 to 6, the same parts as those in FIGS. 1 to 3 are denoted by the same reference numerals and description thereof is omitted.

  Next, operation | movement of the polarized electromagnet 100 in Embodiment 2 is demonstrated using FIGS. FIG. 4 is a central longitudinal sectional view showing a state before the polarized electromagnet 100 is excited. As in the first embodiment, in FIG. 4, the magnetic flux 8 generated by the permanent magnet 5 circulates in the order of the magnetic pole plate 6 → the first arm 7 b → the iron core 7 a → the upper fixed iron core 3 as indicated by the one-dot chain line arrow. . Furthermore, in the second embodiment, the magnetic flux 80 generated by the permanent magnet 50 circulates in the order of the magnetic pole plate 60 → the first arm 7b → the iron core bar 7a → the lower fixed iron core 4 as indicated by a one-dot chain line arrow.

  Next, the operation of the electromagnetic contactor 100 immediately after the electromagnetic coil 2 is excited will be described with reference to FIG. When the electromagnetic coil 2 is excited, a magnetic flux 9 indicated by a solid line arrow in FIG. 5 is generated. In addition to the first magnetic flux 9a and the second magnetic flux 9b, the magnetic flux 9 in the second embodiment further circulates through the iron core rod 7a → the first arm 7b → the upper fixed iron core 3 → the second arm 7c. 3 magnetic flux 9c.

  Here, in the second embodiment, the gap G1 is configured to have a shorter distance than the gap G0. Accordingly, among the three magnetic fluxes generated when the electromagnetic coil 2 is excited, the third magnetic flux 9c is greater in G1 than in G0. For this reason, due to the third magnetic flux 9c, an attractive force acts between the second arm 7c and the upper fixed iron core 3 in the gap G1. Therefore, the iron core 7a receives an upward force.

  When the electromagnetic coil 2 is excited and the movable iron core 7 is displaced in the direction of the arrow d, the gap length between the second arm 7c and the second end plate portions 3b and 4b becomes short, so that the magnetic resistance becomes small. . Then, the magnetic flux flowing through the gap increases and the attractive force further increases, and the movable iron core 7 is more strongly attracted in the direction of the arrow d. Even when the movable iron core 7 is displaced in the direction of the arrow d, the gaps G1 and G0 do not change. Therefore, the iron core 7a receives an upward force.

  As a result of the movable iron core 7 being displaced in the direction of the arrow d, the second end plate portions 3b and 4b and the second arm 7c are adsorbed. A central longitudinal sectional view of the electromagnetic contactor 100 in this case is shown in FIG. As shown in FIG. 6, even in the adsorbing state, a suction force acts between the second arm 7c and the upper fixed iron core 4 in the gap G1, and the iron core rod 7a receives an upward force.

  As described above, in the polarized electromagnet 100 according to the second embodiment, the force in the direction opposite to the gravity direction is applied to the movable iron core 7 in the series of operations of the polarized electromagnet 100 due to the excitation of the electromagnetic coil 2. Can work. Thereby, friction between the iron core rod 7a and the coil spool 1 due to the weight of the movable iron core 7 can be reduced, and smooth sliding between the coil spool 1 can be realized.

Embodiment 3 FIG.
Next, a third embodiment will be described. 7 to 9 are central longitudinal sectional views showing the polarized electromagnet 100 in the normal mounting state in the third embodiment. FIG. 7 shows a state before the polarized electromagnet 100 is excited, and FIG. FIG. 9 shows a state immediately after the polarized electromagnet 100 is excited and before the movable iron core 7 is displaced, and FIG. 9 shows a state where the polarized electromagnet 100 is excited and the movable iron core 7 is being displaced. 7 to 9 correspond to FIGS. 1 to 3 of the first embodiment.

  In the polarized electromagnet 100 according to the third embodiment, the permanent magnet 50 and the magnetic pole plate 60 are arranged as in the second embodiment. However, unlike Embodiment 2, in the 2nd arm 7c with which the movable iron core 7 is provided, the gap between the lower fixed iron core 4 and the upper fixed iron core 3 is equal. On the other hand, in the third embodiment, the length in the vertical direction of the first end plate portion 4a of the lower fixed core 4 is configured to be shorter than that of the first end plate portion 3a of the upper fixed core 3. ing. That is, in FIG. 7, the distance g1 is shorter than the gap g0. 7 to 9, the same parts as those in FIGS. 1 to 3 are denoted by the same reference numerals and description thereof is omitted.

  Next, the operation of the polarized electromagnet 100 according to Embodiment 3 will be described with reference to FIGS. FIG. 7 is a central longitudinal sectional view showing a state before the polarized electromagnet 100 is excited. As in the second embodiment, in FIG. 7, the magnetic fluxes 8 and 80 generated by the permanent magnets 5 and 50 circulate as indicated by the one-dot chain line arrows.

  Here, in the third embodiment, as described above, the gap g1 is configured to have a shorter distance than the gap g0. Therefore, among the attraction forces due to the two magnetic fluxes 8 and 80, the attraction force acting between the end plate portion 3a and the iron core rod 7a in the gap g1 is the end plate portion 4a and the iron core rod in the gap g0. It is larger than the suction force working between 7a. Therefore, the iron core 7a receives an upward force.

  Next, the operation of the electromagnetic contactor 100 immediately after the electromagnetic coil 2 is excited will be described with reference to FIG. When the electromagnetic coil 2 is excited, magnetic fluxes 9a and 9b indicated by solid arrows in FIG. 8 are generated. Then, the movable iron core 7 starts to be displaced in the direction of the arrow d by the attractive force generated between the second arm 7c and the second end plate portions 3b and 4b due to the magnetic flux 9. Even in the state immediately after the electromagnetic coil 2 shown in FIG. 8 is excited, the iron rod 7a receives an upward force because the attractive force acting on the gap g1 is larger than the attractive force acting on the gap g0.

  When the electromagnetic coil 2 is excited and the movable iron core 7 is displaced in the direction of the arrow d, the gap length between the second arm 7c and the second end plate portions 3b and 4b becomes short, so that the magnetic resistance becomes small. . Then, the magnetic flux flowing through the gap increases and the attractive force further increases, and the movable iron core 7 is more strongly attracted in the direction of the arrow d. Even when the movable iron core 7 is displaced in the direction of the arrow d, the gaps g0 and g1 do not change. Therefore, the iron core 7a receives an upward force.

  As a result of the movable iron core 7 being displaced in the direction of the arrow d, the second end plate portions 3b and 4b and the second arm 7c are adsorbed. FIG. 9 is a central longitudinal sectional view of the polarized electromagnet 100 immediately before the second arm 7c is attracted to the end plate portions 3b and 4b. As shown in FIG. 9, until just before the suction, the suction force acting on the gap g1 is larger than the suction force acting on the gap g0, so that the iron core 7a receives an upward force.

  As described above, in the polarized electromagnet 100 according to the third embodiment, the first end plate portion 4a of the lower fixed iron core 4 is configured to be shorter than the first end plate portion 3a of the upper fixed iron core 3. Thus, in the series of operations of the polarized electromagnet 100, a force in the direction opposite to the gravitational direction can be applied to the movable iron core 7. Thereby, friction between the iron core rod 7a and the coil spool 1 due to the weight of the movable iron core 7 can be reduced, and smooth sliding between the coil spool 1 can be realized.

Embodiment 4 FIG.
Next, a fourth embodiment will be described. FIG. 10 is a central longitudinal cross-sectional view showing the polarized electromagnet 100 in the regular mounting state in the fourth embodiment, and is a diagram showing a state before the polarized electromagnet 100 is excited. Corresponds to FIG.

  The polarized electromagnet 100 according to the fourth embodiment is configured to have the configuration of the polarized electromagnet 100 according to the first to third embodiments. That is, the permanent magnet 5 is disposed only on the upper side of the side plate portion 3 c of the upper fixed iron core 3, and the second arm 7 c has a gap between the upper fixed iron core 3 and the gap G 0 with the lower fixed iron core 4. G1 is configured to have a shorter distance, and the gap g1 between the first end plate portion 3a and the gap g0 between the iron core rod 7a and the first end plate portion 4a is smaller. The distance is configured to be shorter. In FIG. 10, the same parts as those in FIG.

  In the fourth embodiment, as described in the first to third embodiments, the iron core 7a receives an upward force. That is, before excitation, the iron core rod 7a receives an upward force due to the magnetic flux of the permanent magnet 5, and after excitation and displacement of the movable iron core 7, the gap G1 is shorter than the gap G0 and the gap g1. Is shorter than the gap g0, the iron core 7a receives an upward force.

  Therefore, in the polarized electromagnet 100 according to the fourth embodiment, in the series of operations of the polarized electromagnet 100, a force in the direction opposite to the gravitational direction can always be applied to the movable iron core 7. Thereby, the friction between the iron core rod 7a and the coil spool 1 due to the weight of the movable iron core 7 can always be reduced, and smooth sliding between the coil spool 1 can be realized.

  In the above-described embodiment, for example, the first end plate portion 4a of the lower fixed iron core 4 is configured to be shorter than the conventional one. However, the configuration is not necessarily limited thereto. That is, since the gap g1 only needs to be configured to have a relatively shorter distance than the gap g0, the first end plate portion 3a of the upper fixed iron core 3 is lengthened downward, whereby the iron core rod Needless to say, the distance to 7a may be relatively short.

  Furthermore, in the above embodiment, for example, the configuration in which the permanent magnet 5 is provided only on the upper side of the polarized electromagnet 100 has been described as an example, but it is not necessarily required to be provided only on the upper side. For example, even if the permanent magnet 50 is provided on the lower side of the polarized electromagnet 100 as long as the magnetic force of the upper permanent magnet 5 is relatively stronger than the magnetic force of the lower permanent magnet 50, the iron core rod. Since 7a receives an upward force, the same effect can be obtained.

  Furthermore, in the said embodiment, the upper side of the 2nd arm 7c is lengthened, the gap G1 with the side plate part 3c of the upper side fixed iron core 3 is shortened, or the 1st end plate part 3a of the upper side fixed iron core 3 is lengthened. Although the gap g1 with the iron core 7a is shortened, the present invention is not necessarily limited to this. That is, for example, as shown in FIG. 11, the gaps G <b> 1 and g <b> 1 may be shortened by shortening the upper side of the first flange 1 a and the second flange 1 b of the coil spool 1.

  Furthermore, in the said embodiment, although the material of the 2nd arm 7c, the upper side fixed iron core 3, and the lower side fixed iron core 4 is not mentioned, you may vary magnetic permeability by changing these materials. For example, while the upper fixed iron core 3 is made of electromagnetic soft iron such as SUY having a high magnetic permeability, the lower fixed iron core 4 is made of steel such as SPCC, so that permanent magnets are provided at the top and bottom, and the gaps G1 and G0 are Even when the gaps g1 and g0 are equal, that is, even when the structure of the polarized electromagnet 100 is a vertical object, the core rod 7a receives an upward force. For this reason, friction with the coil spool 1 can be reduced, and a similar effect of realizing smooth sliding can be obtained. In addition, although the case where the material of the upper side fixed iron core 3 and the lower side fixed iron core 4 was changed was demonstrated here, it does not necessarily restrict to the material of the upper side fixed iron core 3 and the lower side fixed iron core 4. That is, the material of the member through which the upper magnetic flux passes may be a material with high magnetic permeability, and the material of the member through which the lower magnetic flux passes may be a material with lower magnetic permeability than the upper material. For example, the magnetic pole plate 6 may be made of a material having high magnetic permeability, and the magnetic pole plate 60 may be made of a material having lower magnetic permeability than the magnetic pole plate 6. It goes without saying that such a relationship can be applied to any member.

  Furthermore, in the above embodiment, the magnitude of the upward force received by the iron core 7a, that is, the magnitude of the difference between the magnetic force acting upward and the magnetic force acting downward is not mentioned, but the magnitude of the upward force. May be smaller than twice the weight of the movable iron core 7. For example, the force received by the iron core 7a can be controlled by appropriately adjusting the length of the gap G1 or the gap g1. By making the magnitude of the upward force received by the iron core 7a smaller than twice the weight of the movable iron core 7, the friction with the coil spool 1 can be reduced as compared with the case where the present invention is not applied. Smooth sliding with the spool 1 can be realized.

It is a center longitudinal cross-sectional view before the excitation of the polarized electromagnet in Embodiment 1 of this invention. It is a center longitudinal cross-sectional view just after excitation of the polarized electromagnet in Embodiment 1 of this invention. It is a center longitudinal cross-sectional view just after excitation of the polarized electromagnet in Embodiment 1 of this invention. It is a center longitudinal cross-sectional view before the excitation of the polarized electromagnet in Embodiment 2 of this invention. It is a center longitudinal cross-sectional view just after excitation of the polarized electromagnet in Embodiment 2 of this invention. It is a center longitudinal cross-sectional view just after excitation of the polarized electromagnet in Embodiment 2 of this invention. It is a center longitudinal cross-sectional view before the excitation of the polarized electromagnet in Embodiment 3 of this invention. It is a center longitudinal cross-sectional view just after excitation of the polarized electromagnet in Embodiment 3 of this invention. It is a center longitudinal cross-sectional view just after excitation of the polarized electromagnet in Embodiment 3 of this invention. It is a center longitudinal cross-sectional view of the polarized electromagnet in Embodiment 4 of this invention. FIG. 6 is a central longitudinal sectional view of a polarized electromagnet in another embodiment of the present invention. (A) The external view of the electromagnetic contactor using the conventional polarized electromagnet, (b) The longitudinal cross-sectional view of the conventional electromagnetic contactor. It is a center longitudinal cross-sectional view of the conventional polarized electromagnet.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Coil spool 2 Electromagnetic coil 3 Upper fixed iron core 4 Lower fixed iron core 5 Permanent magnet 6 Magnetic pole plate 7 Iron core rod 8, 9 Magnetic flux

Claims (8)

A coil formed by winding a conductive wire into a cylindrical shape is inserted so that the movable iron core is slidable in the coil axial direction, the coil is provided with a fixed body, and a permanent magnet is provided outside the fixed body. In a polarized electromagnet comprising a pole plate having a side portion extending in the coil axial direction outside the permanent magnet and an end portion facing away from one end of the coil,
A polarized electromagnet characterized in that a magnetic force in a direction opposite to the gravitational force is larger than a magnetic force in a gravitational direction acting on the movable iron core.   2. The polarized electromagnet according to claim 1, wherein a difference between a magnetic force in a direction opposite to the gravity acting on the movable iron core and a magnetic force in the gravity direction is smaller than twice the weight of the movable iron core.   The poled according to claim 1, wherein the magnetic force of the permanent magnet provided outside the fixed body is larger than the magnetic force of the permanent magnet provided outside the fixed body. electromagnet. A coil formed by winding a conductive wire into a cylindrical shape is inserted so that the movable iron core is slidable in the coil axial direction, the coil is provided with a fixed body, and a permanent magnet is provided outside the fixed body. In a polarized electromagnet comprising a pole plate having a side portion extending in the coil axial direction outside the permanent magnet and an end portion facing away from one end of the coil,
The said permanent magnet is provided only in the exterior above the said fixed body, The polarized electromagnet characterized by the above-mentioned. A coil formed by winding a conductive wire into a cylindrical shape is inserted so that the movable iron core is slidable in the coil axial direction, the coil is provided with a fixed body, and a permanent magnet is provided outside the fixed body. In a polarized electromagnet comprising a pole plate having a side portion extending in the coil axial direction outside the permanent magnet and an end portion facing away from one end of the coil,
The movable iron core includes a movable piece extending in a coil radial direction at one end, and a distance between the movable piece and the upper fixed body is shorter than a distance between the movable piece and the lower fixed body. Polar electromagnet. A coil formed by winding a conductive wire into a cylindrical shape is inserted so that the movable iron core is slidable in the coil axial direction, the coil is provided with a fixed body, and a permanent magnet is provided outside the fixed body. In a polarized electromagnet comprising a pole plate having a side portion extending in the coil axial direction outside the permanent magnet and an end portion facing away from one end of the coil,
The fixed body sandwiches the coil from above and below, and the upper fixed body includes a side portion extending in the axial direction of the coil and an end portion that is close to and opposed to one end of the coil, and the movable iron core and the upper side A polarized electromagnet characterized in that a distance to a fixed body is shorter than a distance between the movable iron core and the lower fixed body. A coil formed by winding a conductive wire into a cylindrical shape is inserted so that the movable iron core is slidable in the coil axial direction, the coil is provided with a fixed body, and a permanent magnet is provided outside the fixed body. In a polarized electromagnet comprising a pole plate having a side portion extending in the coil axial direction outside the permanent magnet and an end portion facing away from one end of the coil,
The polarized electromagnet according to claim 1, wherein the fixed body sandwiches the coil from above and below, and the upper fixed body is made of a material having a higher magnetic permeability than the lower fixed body.   The polarized electromagnet according to claim 7, wherein the upper fixed body is made of electromagnetic soft iron, and the lower fixed body is made of steel.

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