阅读说明：本技术 一种相控接触器及其永磁机构 (Phase control contactor and permanent magnet mechanism thereof ) 是由 杨海运 郜志 刘勇 甄利 苗俊杰 宫艳朝 王荷生 董宇 王雷雷 于 2021-08-12 设计创作，主要内容包括：本发明属于电气设备技术领域,公开了一种相控接触器及其永磁机构。永磁机构包括：机架,具有连接板；静铁芯,设置在连接板上；动铁芯,在静铁芯的轴向上,与静铁芯相对设置；励磁线圈,设置于静铁芯和动铁芯之间,用于使静铁芯和动铁芯励磁或消磁；连杆,设置在动铁芯上,沿与静铁芯的轴向一致的方向与动铁芯联动；静铁芯和动铁芯的材质均为永磁材料。相控接触器包括：绝缘拉杆；上述的永磁机构,连杆的上部与绝缘拉杆连接。本方案使得当励磁线圈将静铁芯和动铁芯励磁,两个铁芯会产生磁性相互吸引,实现两个铁芯吸附在一起,由于两个永磁铁的吸力远远大于一个磁铁和一个铁芯中间的吸力,所以在应用上的执行精准度高,性能稳定。(The invention belongs to the technical field of electrical equipment, and discloses a phase-control contactor and a permanent magnet mechanism thereof. The permanent magnet mechanism includes: a frame having a connection plate; the static iron core is arranged on the connecting plate; the movable iron core is arranged opposite to the static iron core in the axial direction of the static iron core; the excitation coil is arranged between the static iron core and the movable iron core and is used for exciting or demagnetizing the static iron core and the movable iron core; the connecting rod is arranged on the movable iron core and is linked with the movable iron core along the direction which is consistent with the axial direction of the static iron core; the static iron core and the movable iron core are made of permanent magnetic materials. A phase control contactor includes: an insulating pull rod; in the permanent magnet mechanism, the upper part of the connecting rod is connected with the insulating pull rod. This scheme makes when excitation coil with quiet iron core with move the iron core excitation, two iron cores can produce magnetism inter attraction, realize that two iron cores adsorb together, because the suction of two permanent magnets is greater than the suction in the middle of a magnet and an iron core far away, so execution precision on using is high, the stable performance.)

1. A permanent magnet mechanism for a phase controlled contactor, the permanent magnet mechanism comprising:

a frame having a connection plate;

the static iron core is fixedly arranged on the connecting plate;

the movable iron core is arranged in the axial direction of the static iron core and moves relative to the static iron core;

the excitation coil is arranged between the static iron core and the movable iron core and is used for exciting or demagnetizing the static iron core and the movable iron core;

the connecting rod is arranged on the movable iron core and is linked with the movable iron core along the direction which is consistent with the axial direction of the static iron core; the static iron core and the movable iron core are made of permanent magnetic materials.

2. The permanent magnet mechanism according to claim 1, wherein a first stopper and a second stopper are respectively disposed at the upper portion and the lower portion of the connecting rod, the first stopper abuts against the upper surface of the connecting plate, the second stopper abuts against the lower surface of the movable iron core, and the middle portion of the connecting rod penetrates through the stationary iron core, the movable iron core and the connecting plate;

the permanent magnet mechanism further comprises: and the opening spring is positioned in the static iron core and the movable iron core and is sleeved outside the connecting rod, and two ends of the opening spring are respectively connected with the static iron core and the movable iron core.

3. The permanent magnet mechanism according to claim 2, wherein the middle portion of the connecting rod has a middle upper portion and a middle lower portion, and the diameter of the middle lower portion is smaller than that of the middle upper portion;

the permanent magnet mechanism further comprises: the closing spring is sleeved between the middle lower part of the connecting rod and the opening spring, and two ends of the closing spring are respectively connected with the middle upper part of the connecting rod and the movable iron core;

the length of the closing spring between the middle upper part of the connecting rod and the movable iron core is smaller than the free length of the closing spring.

4. The permanent magnet mechanism according to claim 3, wherein the closing spring, the opening spring, the static iron core, the movable iron core and the connecting rod are coaxially arranged.

5. The permanent magnet mechanism according to claim 1, wherein a first groove is formed on a lower surface of the stationary core, a second groove opposite to the first groove is formed on an upper surface of the movable core, the exciting coil is disposed in the first groove and the second groove, and the movable core is provided with a vent hole penetrating the second groove.

6. The permanent magnet mechanism according to claim 2, further comprising:

and the opening buffer mechanism is arranged above the connecting plate, and the upper surface of the opening buffer mechanism is abutted to the lower surface of the first stop block.

7. The permanent magnet mechanism according to claim 6, wherein the opening buffer mechanism comprises:

the brake separating buffer is arranged above the connecting plate;

the cover plate is arranged above the connecting plate, a buffer cushion is arranged between the middle of the cover plate and the brake separating buffer, and a gap is reserved between the edge of the cover plate and the brake separating buffer.

8. A permanent magnet mechanism according to claim 1, wherein one said movable core is provided for one said stationary core.

9. A phase control contactor, comprising:

an insulating pull rod;

a permanent magnet mechanism according to any one of claims 1 to 8, wherein the upper part of the connecting rod is connected to the insulating rod.

10. A phase controlled contactor as claimed in claim 9, wherein one said permanent magnet mechanism is provided for each phase;

the phase control contactor further includes: and the controller controls the three phases independently according to the bus voltage and the load line current, the voltage is zero-crossed during closing control, and the current is zero-crossed during opening control.

Technical Field

The invention belongs to the technical field of electrical equipment, and particularly relates to a phase-control contactor and a permanent magnet mechanism thereof.

Background

In the permanent magnet mechanism in the prior art, a permanent magnet is used as a magnetic pole, an iron core is used as an action component, under the action of an excitation coil, the iron core is separated from the attraction of one permanent magnet magnetic pole and moves to the other permanent magnet magnetic pole, so that the permanent magnet mechanism is changed from one stable state to the other stable state, and the iron core outputs linear motion. When the magnetic field is changed, the iron core moves from one magnetic pole position to the other magnetic pole position. In the process, the internal magnetic characteristics of the two permanent magnets are unchanged, only under the action of superposition of magnetic fields of the excitation coils, one magnetic field is reduced, the other magnetic field is increased, and the iron core is attracted from one position to the other position. After excitation, the iron core is greater than the attraction of far away magnet far away with the attraction of nearly magnet, and the iron core will keep at stable state under nearly magnet absorption, so theoretically, but actual iron core and permanent magnetism iron magnetism holding power are not very big, and the application on the contactor is controlled mutually and is not careful a bit, and the precision of controlling mutually is not high, has influenced the practical application of product.

Disclosure of Invention

In order to solve the above problem, an aspect of the present invention provides a permanent magnet mechanism for a phase control contactor, including:

a frame having a connection plate;

the static iron core is arranged on the connecting plate;

the movable iron core is arranged in the axial direction of the static iron core and opposite to the static iron core;

the excitation coil is arranged between the static iron core and the movable iron core and is used for exciting or demagnetizing the static iron core and the movable iron core;

the connecting rod is arranged on the movable iron core and is linked with the movable iron core along the direction which is consistent with the axial direction of the static iron core;

the static iron core and the movable iron core are made of permanent magnetic materials.

In the permanent magnet mechanism, optionally, a first stopper and a second stopper are respectively disposed at an upper portion and a lower portion of the connecting rod, the first stopper abuts against an upper surface of the connecting plate, the second stopper abuts against a lower surface of the movable iron core, and a middle portion of the connecting rod penetrates through the stationary iron core, the movable iron core and the connecting plate;

the permanent magnet mechanism further comprises: and the opening spring is positioned in the static iron core and the movable iron core and is sleeved outside the connecting rod, and two ends of the closing spring are respectively connected with the static iron core and the movable iron core.

In the permanent magnet mechanism described above, optionally, the middle part of the connecting rod has a middle upper part and a middle lower part, and the diameter of the middle lower part is smaller than that of the middle upper part;

the permanent magnet mechanism further comprises: the closing spring is sleeved between the middle lower part of the connecting rod and the opening spring, and two ends of the closing spring are respectively connected with the middle upper part of the connecting rod and the movable iron core;

the length of the closing spring between the middle upper part of the connecting rod and the movable iron core is smaller than the free length of the closing spring.

In the permanent magnet mechanism described above, optionally, the closing spring, the opening spring, the stationary iron core, the movable iron core, and the connecting rod are coaxially disposed.

In the permanent magnet mechanism described above, optionally, a first groove is provided on a lower surface of the stationary core, a second groove opposite to the first groove is provided on an upper surface of the movable core, the excitation coil is disposed in the first groove and the second groove, and the movable core is provided with a vent hole penetrating through the second groove.

In the permanent magnet mechanism described above, optionally, an axial direction of the air vent is parallel to an axial direction of the second groove.

In the permanent magnet mechanism described above, optionally, the phase control contactor further includes:

and the opening buffer mechanism is arranged above the connecting plate, and the upper surface of the opening buffer mechanism is abutted to the lower surface of the first stop block.

In the permanent magnet mechanism described above, optionally, the opening buffer mechanism includes:

the brake separating buffer is arranged above the connecting plate;

the cover plate is arranged above the connecting plate, a buffer cushion is arranged between the middle of the cover plate and the brake separating buffer, and a gap is reserved between the edge of the cover plate and the brake separating buffer.

In the permanent magnet mechanism described above, optionally, one movable core is provided for one stationary core.

In another aspect of the present invention, there is provided a phase-controlled contactor, including:

an insulating pull rod;

the permanent magnet mechanism is the permanent magnet mechanism, and the upper part of the connecting rod is connected with the insulating pull rod.

In the phase-controlled contactor as described above, optionally, one permanent magnet mechanism is provided for each phase;

the phase control contactor further includes: and the controller controls the three phases independently according to the bus voltage and the load line current, the voltage is zero-crossed during closing control, and the current is zero-crossed during opening control.

The technical scheme provided by the embodiment of the invention has the following beneficial effects:

through setting up the frame, quiet iron core, move the iron core, excitation coil and connecting rod, for a quiet iron core configuration one moves the iron core, move iron core and connecting rod linkage, and set up excitation coil in quiet iron core and move between the iron core, will quiet iron core and move the iron core excitation when excitation coil, quiet iron core with move the iron core and can produce magnetism inter attraction, move the iron core and remove to quiet iron core, realize two iron core adsorbs together, the connecting rod simultaneously because of with moving the iron core linkage, the upper portion of connecting rod can drive rather than the insulating pull rod removal of the phase control contactor who is connected, realize the closure of phase control contactor. After the excitation of the static iron core and the movable iron core is finished, the magnetism of each iron core is kept and does not disappear, so that the attraction force of the two permanent magnets is far greater than that of the permanent magnet serving as a magnetic pole and the attraction force of the middle of the iron core serving as an action part in the prior art, and the execution precision in application is high and the performance is stable. When excitation coil with quiet iron core with move the iron core excitation, quiet iron core with move the magnetism of iron core and disappear, two iron cores can take place to separate, move the iron core promptly and remove to the direction of keeping away from quiet iron core, under the detached state, two iron cores are not magnetic, and the connecting rod is because of moving the iron core linkage simultaneously, and the upper portion of connecting rod can drive the insulating pull rod removal rather than the phase control contactor that is connected, realizes the disconnection of phase control contactor.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a phase-control contactor according to an embodiment of the present invention.

Fig. 2 is a schematic structural diagram (in a closing state) of a permanent magnet mechanism according to an embodiment of the present invention.

Fig. 3 is a schematic structural diagram (in an open state) of a permanent magnet mechanism according to an embodiment of the present invention.

The symbols in the figures are as follows:

1 insulating pole, 2 vacuum switches, 3 insulating pull rods, 4 connecting rods, 41 first stoppers, 42 second stoppers, the middle upper part of the middle part of 43 connecting rods, the middle lower part of the middle part of 44 connecting rods, 45 guide blocks, 5 opening buffer mechanisms, 51 opening buffer buffers, 52 buffer pads, 53 cover plates, 54 gaps, 6 connecting plates 7 permanent magnet mechanisms, 71 static iron cores, 72 movable iron cores, 73 opening springs, 74 closing springs, 75 magnet exciting coils, 76 first grooves, 77 second grooves, 78 gaps, 8 frames and 9 vent holes.

Detailed Description

The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings. The various examples are provided by way of explanation of the invention, and not limitation of the invention. In fact, it will be apparent to those skilled in the art that modifications and variations can be made in the present invention without departing from the scope or spirit thereof. For instance, features illustrated or described as part of one embodiment, can be used with another embodiment to yield a still further embodiment. It is therefore intended that the present invention encompass such modifications and variations as fall within the scope of the appended claims and equivalents thereof.

In the description of the present invention, the terms "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, which are for convenience of description of the present invention only and do not require that the present invention must be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. The terms "connected," "connected," and "disposed" as used herein are intended to be broadly construed, and may include, for example, fixed and removable connections; can be directly connected or indirectly connected through intermediate components; the connection may be a wired electrical connection, a wireless electrical connection, or a wireless communication signal connection, and a person skilled in the art can understand the specific meaning of the above terms according to specific situations.

Referring to fig. 1 to 3, an embodiment of the present invention provides a permanent magnet mechanism for a phase control contactor, including: the magnetic suspension device comprises a frame 8, a static iron core 71, a movable iron core 72, an excitation coil 75 and a connecting rod 4.

The frame 8 is used for providing support and has a connecting plate 6. The stationary core 71 is fixedly disposed on the connecting plate 6 of the frame 8, for example, a first threaded hole may be formed in the stationary core 71, a second threaded hole may be formed in the connecting plate 6, the two threaded holes are opposite to each other, and the stationary core 71 is mounted on the connecting plate 6 of the frame 8 by a threaded connection between a bolt and the two threaded holes. The movable iron core 72 and the stationary iron core 71 are arranged in a relatively movable manner in the axial direction (i.e., the vertical direction in fig. 1) of the stationary iron core 71, that is, the stationary iron core 71 is fixed, the movable iron core 72 moves relative to the stationary iron core 71, one movable iron core 72 is provided with one stationary iron core 71, the movable iron core 72 is located below the stationary iron core 71, and at this time, the upper surface of the movable iron core 72 is opposite to the lower surface of the stationary iron core 71. For convenience of operation, the movable iron core 72 and the stationary iron core 71 are coaxially disposed. The exciting coil 75 is provided between the stationary core 71 and the movable core 72, and excites or demagnetizes the stationary core 71 and the movable core 72 simultaneously by an excitation pulse. The movable iron core 72 and the static iron core 71 are both made of permanent magnetic materials, such as permanent magnetic alloy, i.e. the movable iron core 72 and the static iron core 71 are made of permanent magnetic alloy. When the magnetic field generating device is applied, an external excitation power supply inputs an excitation pulse to a connecting terminal formed by the excitation coil 75, and when the excitation pulse in the first direction is input, the static iron core 71 and the movable iron core 72 are excited to generate magnetism; when the second-direction excitation pulse is input, the stationary core 71 and the movable core 72 are demagnetized, and the second direction is opposite to the first direction, i.e., the second direction is a reverse direction and the first direction is a forward direction. The connecting rod 4 is arranged on the movable iron core 72 and is linked with the movable iron core 72, namely, the moving of the movable iron core 72 can drive the connecting rod 4 to move, the moving of the connecting rod 4 can drive the moving of the movable iron core 72, and the moving directions of the connecting rod 4 and the moving directions of the movable iron core 72 are the same as the axial direction of the static iron core 71 and can be the same as the axial direction of the static iron core 71 or the direction parallel to the axial direction of the static iron core 71.

Through setting up frame 8, quiet iron core 71, move iron core 72, excitation coil 75 and connecting rod 4, for a quiet iron core 71 configuration one moves iron core 72, move iron core 72 and connecting rod 4 linkage, and set up excitation coil 75 between quiet iron core 71 and moving iron core 72, when excitation coil 75 with quiet iron core 71 with move the excitation of iron core 72, quiet iron core 71 and moving iron core 72 can produce magnetism inter attraction, move iron core 72 and remove to quiet iron core 71, realize that two iron cores adsorb together, connecting rod 4 is because of moving iron core 72 linkage simultaneously, connecting rod 4's upper portion can drive the insulating pull rod 3 rebound rather than the phase control contactor that is connected, realize phase control contactor's closure, this moment say that permanent magnet mechanism is in the state of closing. Each iron core keeps magnetism and does not disappear after quiet iron core 71 and movable iron core 72 excitation, so the suction of two permanent magnets (quiet iron core 71 and movable iron core 72) is greater than one among the prior art as the permanent magnet of magnetic pole and the middle suction of an iron core as the action part far away, magnetic force is big promptly for execution precision on using is high, the stable performance, and is fast moreover, and inside frictional force is little, and automatically controlled power is accurate, and it is more accurate to compare the time of 7 divide-shut brake of permanent magnetic mechanism among the prior art. When the excitation coil 75 demagnetizes the static iron core 71 and the movable iron core 72, the magnetism of the static iron core 71 and the movable iron core 72 disappears, the two iron cores are separated, namely the movable iron core 72 moves towards the direction far away from the static iron core 71, under the separation state, the two iron cores are not magnetic, meanwhile, the connecting rod 4 is linked with the movable iron core 72, the upper part of the connecting rod 4 can drive the insulation pull rod 3 of the phase control contactor connected with the connecting rod to move downwards, the disconnection of the phase control contactor is realized, and at the moment, the permanent magnet mechanism is in a brake separating state.

The link 4 is installed to penetrate the stationary core 71, the movable core 72, and the connecting plate 6, in order to simplify the structure, facilitate the operation, and enhance the stability. The first stopper 41 is disposed on the upper portion of the connecting rod 4, and the form of the first stopper 41 may be a shaft shoulder of the connecting rod 4, that is, an integral mechanism with the connecting rod 4, or may be a component independent of the connecting rod 4, that is, the first stopper 41 and the connecting rod 4 are a split structure, which is not limited in this embodiment. A second stop 42 is provided at the lower part of the connecting rod 4, the second stop 42 may be in the form of a nut, which facilitates the mounting and fixing of the connecting rod 4. The first stopper 41 is disposed above the connecting plate 6, and the lower surface of the first stopper 41 contacts with the upper surface of the connecting plate 6, so that the movable iron core 72 and the static iron core 71 are disposed opposite to each other under the action of the first stopper 41 and the second stopper 42, and at this time, the permanent magnet mechanism is in an open state. In fig. 1, the first stopper 41, the connecting plate 6, the stationary core 71, the movable core 72, and the second stopper 42 are arranged in this order in the vertical direction. The middle part of the connecting rod 4 penetrates through the static iron core 71 and the movable iron core 72, a first connecting rod hole needs to be formed in the static iron core 71 at the moment, a second connecting rod hole is formed in the movable iron core 72, and the connecting rod 4 penetrates through the first connecting rod hole and the second connecting rod hole to be arranged in the static iron core 71 and the movable iron core 72.

When opening the brake, the movable iron core 72 and the static iron core 71 need to be separated, and for this reason, the permanent magnet mechanism further includes: and a switching-off spring 73 which is compressed and deformed when switching-on, and which can store energy generated by the deformation, and which releases the energy to move the movable iron core 72 in a direction away from the stationary iron core 71 when switching-off, thereby realizing switching-off. The opening spring 73 is positioned in the static iron core 71 and the movable iron core 72 and is sleeved outside the connecting rod 4, two ends of the opening spring 73 are respectively connected with the static iron core 71 and the movable iron core 72, for example, the upper part of the opening spring 73 is positioned in a first connecting rod hole, the first connecting rod hole is step-shaped, a first step surface is formed, the inner diameter of one side close to the inside of the movable iron core 72 is large, and the top end of the opening spring 73 is connected with the first step surface; the lower part of the opening spring 73 is positioned in the second connecting rod hole, the second connecting rod hole is step-shaped, a second step surface is formed, the inner diameter of one side close to the inside of the static iron core 71 is large, and the bottom end of the opening spring 73 is connected with the second step surface, so that the opening spring 73 can be compressed when the movable iron core 72 moves upwards, and the movable iron core 72 can be driven to move downwards when the opening spring 73 releases energy. The connection of the spring in the present embodiment may be a contact connection, or may be a connection method such as a solder connection, and the present embodiment is not limited thereto.

The middle portion of the link 4 has an upper middle portion 43 and a lower middle portion 44, the upper middle portion is located in the first link hole, the lower middle portion is located in the second link hole, and the diameter of the lower middle portion is smaller than that of the upper middle portion, so that the middle portion of the link 4 is stepped to form a third step surface. In order to bring the insulating rod 3 into close contact with the vacuum switch 2, the permanent magnet mechanism further includes: the closing spring 74 is sleeved outside the middle-lower portion of the connecting rod 4 and located inside the opening spring 73, in other words, the closing spring 74 is located between the middle-lower portion of the connecting rod 4 and the opening spring 73, the top end of the closing spring 74 may be connected with the third step surface, the bottom end of the closing spring 74 is connected with the movable iron core 72, the length of the closing spring 74 between the middle-upper portion of the connecting rod 4 and the movable iron core 72 is smaller than the free length of the closing spring 74, that is, the closing spring 74 is always in a compressed state, and when the closing spring 74 is in the opening state, the closing spring 74 is still in the compressed state, so that after the movable iron core 72 moves upwards and is attracted to the stationary iron core 71, energy is released, an upward acting force can be given to the connecting rod 4, and then is sequentially transmitted to the insulating connecting rod 4 and the vacuum switch 2, and the closing firmness of the vacuum switch 2 is improved. The position where the bottom end of the closing spring 74 is connected to the plunger 72 may be a second step surface of the plunger 72, and in other embodiments, the position may be a fourth step surface, where a middle portion of the second step surface is recessed, so as to improve stability of the two springs. The lower end surface of the middle upper portion of the connecting rod 4 may be exposed to a space formed when the stationary core 71 and the movable core 72 are separated, and for example, the lower end surface is higher than the lower end surface of the stationary core 71 in the vertical direction, or is lower than the lower end surface of the stationary core 71 and higher than the upper end surface of the movable core 72.

When the movable iron core 72 and the static iron core 71 are in the open state, a space is formed between the movable iron core 72 and the static iron core 71, when the movable iron core 72 and the static iron core 71 are in the close state, the space between the movable iron core 72 and the static iron core 71 is almost not compressed, in order to improve the fluency of the action of the movable iron core 72, an annular first groove 76 is arranged on the lower surface of the static iron core 71, an annular second groove 77 is arranged on the upper surface of the movable iron core 72, the second groove 77 is arranged opposite to the first groove 76, the exciting coil 75 is sleeved in the first groove 76 and the second groove 77, and can be fixed in the first groove 76 or the second groove 77, and the embodiment does not limit the above. A space 78 is provided between the circumferential outer surface of the field coil 75 and the wall surface of the second groove 77. The movable iron core 72 is provided with a vent hole 9 (or called an exhaust hole) which is communicated with the second groove 77, namely, the vent hole 9, the second groove 77, the interval 78 and the space form a communicated channel, which is beneficial to the circulation of air flow, thereby avoiding the obstruction caused by the air flow when the movable iron core 72 moves, and ensuring that the internal friction force is small. To further mention the fluency when the plunger 72 moves, the vent hole 9 is provided in the lower surface of the plunger 72. The axial direction of the vent hole 9 is parallel to the axial direction of the second groove 77, which is away from the tie rod with respect to the axial direction of the second groove 77. The vent hole 9 is completely penetrated with the second recess 77. The vent holes 9 are arranged in an annular shape, can be annular holes, are beneficial to improving the moving smoothness and the moving stability, and can also be formed by arranging a plurality of vent holes at intervals in an annular shape.

When the movable iron core 72 moves downward, the first stopper 41 connected to the upper portion of the connecting rod 4 collides with the connecting plate 6, and in order to reduce the collision damage of the first stopper 41 to the connecting plate 6, the permanent magnet mechanism further includes: and a switching buffer mechanism 5 provided between the connection plate 6 and the first stopper 41, that is, having a lower surface connected to an upper surface of the connection plate 6 and an upper surface abutting against a lower surface of the first stopper 41.

Specifically, the opening buffer mechanism 5 includes: a shunt buffer 51, a cover plate 53 and a buffer pad 52. The opening buffer 51 is disposed above the connection plate 6, and may be plate-shaped or groove-shaped. The cushion pad 52 is disposed between the cover plate 53 and the opening buffer 51. The cover plate 53 is disposed above the cushion pad 52. Preferably, the opening buffer 51 has a groove shape, and the opening buffer 51 accommodates a buffer pad 52, that is, the middle portion of the opening buffer 51 is recessed with respect to the edge portion of the opening buffer 51 to form a groove, the buffer pad 52 is filled in the groove, and the upper surface of the buffer pad 52 is lower than the upper surface of the edge portion of the opening buffer 51. The cover plate 53 includes a flat plate portion and a projection portion, and in fig. 2, the projection portion projects downward relative to the flat plate portion and is located at a middle position of the flat plate portion. The protrusions are connected to the cushion 52, which may be a contact connection, and the lower surfaces of the protrusions may be located in the aforementioned recesses. The edge of the flat plate portion is positioned opposite to the edge of the opening damper 51 with a gap 54 formed therebetween, so that a damping space is provided for collision contact.

The first screw hole provided in the upper surface of the stationary core 71 may be communicated with the first groove 76, and a space 78 is provided between the circumferential edge of the exciting coil 75 and the wall surface of the first groove 76, so that the moving smoothness of the movable core 72 can be further improved. The axial direction of the first threaded hole is close to the axial direction of the connecting rod 4 with respect to the axial direction of the first recess 76.

The guide block 45 is arranged at the bottom end of the middle lower part of the connecting rod 4, correspondingly, the guide groove is formed in the lower surface of the movable iron core 72, the guide block 45 is embedded in the guide groove, and when the movable iron core 72 moves and the closing spring 74 releases energy, the moving stability of the connecting rod 4 can be improved.

In order to improve stability, frame 8 includes roof, curb plate and bottom plate, and three interconnect forms accommodation space, is provided with connecting plate 6 in it, and there is the interval in vertical direction connecting plate 6 and roof and bottom plate, and connecting plate 6 is unsettled to be set up between roof and bottom plate promptly, is provided with insulating utmost point post 1 on the roof, so avoid switching on or when separating brake to following direct impact of insulating utmost point post 1. The stationary core 71 is fixedly disposed below the connecting plate 6.

Another embodiment of the present invention further provides a phase-control contactor (or phase-control vacuum contactor), including: the three contactor units, each contactor unit has insulating pull rod 3 and permanent magnetism mechanism 7, still has vacuum switch 2, insulating utmost point post 1, and insulating pull rod 3 is connected with vacuum switch 2. The permanent magnet mechanism is the permanent magnet mechanism 7, and the upper part of the connecting rod 4 is connected with the insulating pull rod 3.

A permanent magnet arrangement 7, an insulating rod 3 and a vacuum switch 2 are assigned to each phase. The phase control contactor further includes: the electric control unit (or called controller) controls three phases (namely a permanent magnet mechanism configured for each phase) independently according to bus voltage and load line current, namely a phase-splitting control contactor, wherein voltage zero-crossing is performed during closing control, and current zero-crossing is performed during opening control. That is to say: the sampling is bus voltage and load line current, the switching-on strategy is voltage zero crossing, and the switching-off strategy is current zero crossing. The controller also has a self-adaptive function, judges whether the switching-on and switching-off phases are correct and the errors exist by analyzing voltage and current sampling, and corrects the switching-on and switching-off phases at the next time. The compensation can be carried out according to the difference value of the theoretical time of opening and closing and the actual sampling time of opening and closing. Through tests, the closing precision and the opening precision of the phase control contactor are within 0.3mS and 0.1mS, namely, the time precision of the phase control contactor can be controlled within +/-0.3 mS for closing and +/-0.1 mS for opening.

It will be appreciated by those skilled in the art that the invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The embodiments disclosed above are therefore to be considered in all respects as illustrative and not restrictive. All changes which come within the scope of or equivalence to the invention are intended to be embraced therein.