Contactor static analysis method and analysis device

Abstract

The present disclosure provides an analysis method for a contactor, the method comprising: applying an attraction force to a moving iron core to move the moving iron core at a constant speed towards a static iron core to perform an attraction process, and collecting a plurality of attraction data during the attraction process, the plurality of attraction data comprising a displacement of the moving iron core and a magnitude of the attraction force during the attraction process; applying a release force to the moving iron core to move the moving iron core at a constant speed away from the static iron core to perform a release process, and collecting a plurality of release data during the release process, the plurality of release data comprising a displacement of the moving iron core and a magnitude of the release force during the release process; and determining whether a fault exists inside the contactor based on the plurality of attraction data and the plurality of release data.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to an analysis method and an analysis device for a contactor. BACKGROUND

[0002] Contactor is widely used in electrical system, in which electromagnetic coil generates magnetic field by current flow, and the moving iron core is attracted to the static iron core, driving the moving contact and the static contact to close, thereby controlling the load. However, with the increase of the use times of the contactor, faults such as spring failure, mechanism jamming, and asynchronous contact between the moving contact and the static contact may occur between the internal mechanisms of the contactor, causing the mechanism to move slowly or even the contactor to be unable to attract, affecting the use of the product and shortening the service life of the product. SUMMARY

[0003] In view of this, the purpose of the embodiments of the present disclosure is to provide an analysis method and an analysis device for a contactor, which can analyze the characteristics of the contactor in a static state (i.e., the contactor is powered off), such as the characteristics related to the use and service life of the contactor, including internal faults of the contactor, stroke of the contactor, and / or overtravel of the contactor, etc.

[0004] The present disclosure provides an analysis method for a contactor. The contactor includes a static iron core, a moving iron core opposite to the static iron core, an iron core spring disposed between the static iron core and the moving iron core, a static contact having a plurality of contacts, a moving contact having a plurality of contacts opposite to the static contact, a moving contact bracket disposed on the moving iron core, a contact spring connecting the moving contact bracket and the moving contact, and the plurality of contacts of the moving contact are respectively contacted with the plurality of contacts of the static contact via the moving contact bracket when the moving iron core moves in a direction close to the static iron core. The analysis method includes: applying an attraction force to the moving iron core to make the moving iron core move at a constant speed in a direction close to the static iron core to perform an attraction process, and collecting a plurality of attraction data in the attraction process, the plurality of attraction data including the displacement of the moving iron core and the size of the attraction force in the attraction process; applying a release force to the moving iron core to make the moving iron core move at a constant speed in a direction away from the static iron core to perform a release process, and collecting a plurality of release data in the release process, the plurality of release data including the displacement of the moving iron core and the size of the release force in the release process; and determining whether there is a fault inside the contactor based on the plurality of attraction data and the plurality of release data.

[0005] Another aspect of the present disclosure provides an analysis device for a contactor, the analysis device comprising: a driving unit configured to apply an attraction force to a moving iron core to move the moving iron core at a constant speed toward a static iron core to perform an attraction process, and to apply a release force to the moving iron core to move the moving iron core at a constant speed away from the static iron core to perform a release process; a collecting unit configured to collect a plurality of attraction data in the attraction process, the plurality of attraction data comprising a displacement of the moving iron core and a magnitude of the attraction force in the attraction process, and to collect a plurality of release data in the release process, the plurality of release data comprising a displacement of the moving iron core and a magnitude of the release force in the release process; and a processing unit configured to determine whether a fault exists inside the contactor based on the plurality of attraction data and the plurality of release data.

[0006] The analysis method and the analysis device for a contactor provided by the present disclosure can be performed in a static state (i.e., the contactor is powered off), the analysis device applies an external force to the contactor to perform the attraction process and the release process, determines whether a fault exists in the internal mechanism of the contactor based on the magnitude data of the external force and the displacement data of the moving iron core of the contactor collected in the attraction process and the release process, and can easily determine the stroke and the overtravel of the contactor according to the collected displacement data. BRIEF DESCRIPTION OF DRAWINGS

[0007] In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings used in the description of the embodiments will be briefly introduced. Obviously, the drawings in the following description are only some example embodiments of the present disclosure, and other drawings can be obtained by those skilled in the art without any creative effort based on these drawings.

[0008] Figure 1 is a structural schematic diagram of a contactor according to an embodiment of the present disclosure;

[0009] Figure 2 is a use scenario schematic diagram of an analysis method for a contactor according to an embodiment of the present disclosure;

[0010] Figure 3 is a flow schematic diagram of an analysis method for a contactor according to an embodiment of the present disclosure;

[0011] Figure 4 is a schematic diagram of main stages in an attraction process of a contactor when using an analysis method for a contactor according to an embodiment of the present disclosure;

[0012] Figure 5 is a schematic diagram of main stages in a release process of a contactor when using an analysis method for a contactor according to an embodiment of the present disclosure;

[0013] Figure 6is an example of the attraction force / release force-displacement graph fitted from the collected attraction data and release data when using the analysis method for contactors according to an embodiment of the present disclosure;

[0014] Figure 7 is Figure 3 is a further flowchart of step S330 in

[0015] Figure 8 is a friction force-displacement graph corresponding to the attraction force / release force-displacement graph in Figure 6

[0016] Figures 9A to 9C is another example of the attraction force / release force-displacement graph obtained by applying the analysis method for contactors according to an embodiment of the present disclosure at different life stages of the contactor.

[0017] Figure 10 is a structural block diagram of the analysis device for contactors according to an embodiment of the present disclosure. DETAILED DESCRIPTION

[0018] The present disclosure will be described in detail with reference to exemplary embodiments thereof. The present disclosure, however, can be embodied in many different forms, and should not be construed as being limited to the embodiments set forth herein. Rather, these described embodiments are provided so that this disclosure will be thorough and complete, and fully convey the concept of the present disclosure to those skilled in the art. Features of the described embodiments can be combined or replaced by other features, unless explicitly excluded or contextually incompatible.

[0019] Unless defined otherwise, technical and scientific terms used herein have the same meaning as those commonly understood by one of ordinary skill in the art to which this disclosure belongs. The terms "first", "second", and the like, as used in the present disclosure, do not denote any order, quantity, or importance, but are used to identify different components. The terms "upper", "lower", and the like mentioned in the present disclosure are used only for example, and cannot be used to limit the scope of the present disclosure.

[0020] Figure 1 is a structural schematic diagram of the contactor according to an embodiment of the present disclosure. For the sake of simplicity, Figure 1 in

[0021] Reference is made to Figure 1 ​The contactor 100 includes a static core 102, a dynamic core 103 opposite to the static core 102, a core spring 104 arranged between the static core 102 and the dynamic core 103, and the dynamic core 103 is caused to move towards the static core 102 to compress the core spring 104. The contactor 100 further includes a static contact 106 having a plurality of contact points 1061, 1062, a dynamic contact support 107 arranged on the dynamic core 103, a dynamic contact 108 having a plurality of contact points 1081, 1082 arranged on the dynamic contact support 107, and a contact spring 109 connecting the dynamic contact support 107 and the dynamic contact 108, so that when the dynamic core 103 moves towards the static core 102, the plurality of contact points of the dynamic contact 108 are caused to contact the plurality of contact points of the static contact 106 via the dynamic contact support 107, and the contact spring 109 is compressed due to the resistance generated after the contact points of the dynamic contact 108 and the static contact 106 are contacted. The contactor 100 can further include a lower base 101 and an upper base 105, the static core 102 is arranged on the lower base 101, and the static contact 106 is arranged on the upper base 105. A pair of dynamic contacts 108 and static contacts 106 in the figure is only for example, the contactor 100 can include the same number of dynamic contacts and static contacts, and the number of dynamic contacts or static contacts contained in the contactor 100 is referred to as the number of stages N of the contactor 100. For example, the contactor 100 can have a main contact and an auxiliary contact, the main contact can include three pairs of dynamic contacts and static contacts corresponding to three phases of a power supply respectively, and the auxiliary contact can include a normally open contact and / or a normally closed contact, etc.

[0022] In addition, the contactor 100 can also include a coil assembly 110 disposed within the static core 102. When the contactor 100 is energized in a circuit, the coil assembly 110 generates a magnetic field due to the current flowing therethrough, causing the moving core 103 to be attracted and move in a direction closer to the static core 102, the movement of the moving core 103 causing the movement of the moving contact support 107, which in turn causes the contacts 1081, 1082 of the moving contact 108 to contact the contacts 1061, 1062 of the static contact 106, respectively. The contact of the moving contact 108 with the static contact 106 causes the contact springs 109 to be compressed by a distance against the resistance, and the moving core 103 and the contact support 107 continue to move in the direction closer to the static core 102 by the distance until the moving core 103 closes with the static core 102. The distance is referred to as the overtravel of the contactor 100, which helps to ensure the contact pressure and thus the good contact of the contacts of the moving contact with the contacts of the static contact. The process of the movement of the moving core in the direction closer to the static core 102 until the moving core 103 closes with the static core 102 is referred to as the attraction process. Conversely, when the contactor 100 is de-energized, the magnetic field generated by the coil assembly 110 disappears, and the core spring 104 and the contact springs 109, which are compressed during the attraction process, reset, thereby causing the movement of the moving core 103 in a direction away from the static contact 102, and thus causing the contacts 1081, 1082 of the moving contact 108 to separate from the contacts 1061, 1062 of the static contact 106, respectively. This process is referred to as the release process of the contactor 100.

[0023] After the contactor 100 has experienced many (e.g., hundreds of thousands) of attraction and release processes, the possibility of failure of the internal mechanism of the contactor 100 due to wear or other reasons increases, such failures including, for example, spring failure, mechanism jamming, different steps of contact between the contacts of the moving contact and the contacts of the static contact, imbalance of the moving contact after all the contacts of the moving contact and the contacts of the static contact are contacted, etc., which damage the life of the contactor and even cause the contactor to fail to attract, etc. In current practice, the contactor is usually disassembled when the contactor is completely unusable or has reached the service life, and the wear and tear of the internal mechanism is observed to infer the possible abnormalities of the internal mechanism during use, and to study how to avoid these abnormalities through the design of the product. However, analyzing the contactor when the contactor is completely unusable or has reached the service life can not locate the internal mechanism that fails at each life stage of the contactor, and disassembling the contactor also brings inconvenience to the implementation of the analysis.

[0024] The analysis method and analysis device for contactors provided by the present disclosure are simple to implement, can be conveniently performed at various life stages of the contactor, and can locate the mechanism with a fault. Thus, the analysis method can be implemented on the contactor at various life stages of the contactor to locate the mechanism with a fault, so that timely decisions can be made for inspection, repair, replacement of the mechanism, or other decisions that are beneficial to the normal operation of the mechanism, thereby prolonging the service life of the contactor and providing a richer data basis for product design of the contactor.

[0025] Figure 2 is a use scenario diagram of the analysis method for contactors according to an embodiment of the present disclosure.

[0026] Reference Figure 2 The contactor 100 is placed on a test platform, the test platform is provided with a clamp 1 and a clamp 2, the clamp 1 fixes the lower base 101 of the contactor, the clamp 2 fixes the upper base 105 of the contactor, and the moving iron core 103 is connected with an analysis device 1000 for contactors according to an embodiment of the present disclosure (hereinafter, the analysis device 1000 will be described in detail in combination with Figure 10 The analysis device 1000 drives the moving iron core 103 to move towards the stationary iron core 102 to perform a pull-in process, or drives the moving iron core 103 to move away from the stationary iron core 102 to perform a release process, and collects data related to the movement of the internal mechanism of the contactor 100 during the pull-in process and the release process, and then analyzes whether the internal mechanism has a fault based on the data. The analysis device 1000 can be powered by a motor (not shown) to implement the above driving.

[0027] Figure 3 is a flow diagram of the analysis method 300 for contactors according to an embodiment of the present disclosure. Reference Figure 3 The analysis method 300 for the contactor 100 according to an embodiment of the present disclosure can include steps S310 to S330.

[0028] At step S310, a pull-in force F p is applied to the moving iron core 103 to move the moving iron core 103 at a constant speed towards the stationary iron core 102 to perform a pull-in process, and a plurality of pull-in data is collected during the pull-in process, the plurality of pull-in data including the displacement S of the moving iron core 103 and the magnitude of the pull-in force F p during the pull-in process. Step S310 will be described below in combination with Figure 4 and Figure 6 .

[0029] Figure 4 is a diagram of the main stages in the pull-in process of the contactor 100 when the analysis method 300 for contactors according to an embodiment of the present disclosure is used. For brevity,Figure 4 The test platform, clamps 1-2 and analysis device 1000 shown in Figure 2 Figure 6 is an example of a pull-in force / release force-displacement graph fitted from the pull-in data and release data collected when using the analysis method 300 for a contactor according to an embodiment of the present disclosure.

[0030] Referring to Figure 4 , position a represents a position where the moving contact 108 and the stationary contact 106 are open and the core spring 104 is not compressed, position b represents a position where the moving contact 108 and the stationary contact 106 have contact between the contacts but not all the contacts, position c represents a position where the moving contact 108 and the stationary contact 106 have contact between all the contacts, and position d represents a position where the moving core 103 and the stationary core 102 are closed. Among them, position b does not necessarily occur and is expected not to occur. One of the main reasons for the occurrence of position b is that the moving contact 108 or the stationary contact 106 itself is poorly assembled or the contacts 1061 and 1062 of the stationary contact 106 are not of equal height due to loosening of the fastening member after the contactor is used for a certain number of times, thereby causing the contact between the moving contact 108 and the stationary contact 106 to be out of sync. For the sake of brevity, Figure 4 In the above embodiment, only one pair of moving contact and stationary contact is shown, but it should be understood that the number of moving contacts and stationary contacts can be multiple.

[0031] In the example where the pull-in process sequentially goes through position a, position b, position c and position d, the pull-in process can be divided into three stages: the first pull-in stage from position a to position b, i.e. the stage from the start of compression of the core spring 104 to the contact between the moving contact 108 and the stationary contact 106; the second pull-in stage from position b to position c, i.e. the second pull-in stage from the contact between the moving contact and the stationary contact to the contact between all the contacts; and the third pull-in stage from position c to position d, i.e. the third pull-in stage from the contact between all the contacts in the moving contact and the stationary contact to the closure of the moving core and the stationary core.

[0032] In the first pull-in stage, i.e. the stage from the start of compression of the core spring 104 to the contact between the moving contact 108 and the stationary contact 106. The analysis device 1000 applies a pull-in force F p to the moving core 103 to move the moving core 103 at a constant speed towards the stationary core 102. The moving core 103 drives the moving contact support 107, the moving contact 108 and the contact spring 109 to move towards the stationary core 102, thereby causing the moving contact 108 to contact the stationary contact 106. The force acting on the moving core 103, the moving contact support 107 and the moving contact 108 as a whole includes: the pull-in force F p ​, the elastic force F k1 from the core spring 104 in the direction away from the static core 102 k1 +f=F p .

[0033] In this stage, the main source of the friction force f is the friction force generated by the relative sliding between the moving core 103 and other parts of the contactor in contact with the moving core 103, which mainly includes the internal structure of the lower base 101 not shown in the figure, such as the arm structure in the lower base in contact with the moving core 103, etc. Therefore, the size of the friction force f in this stage can reflect whether the moving core 103 has stuck.

[0034] In the second closing stage, that is, the second closing stage in which the contact points in the moving contact 108 and the static contact 106 are in contact with all the contact points. In this very short period of time, as soon as the contact points in the moving contact 108 and the static contact 106 are in contact, the moving contact 108 has a tendency to stop moving, and the contact spring 109 begins to deform due to the resistance. The force on the moving core 103, the moving contact support 107 and the moving contact 108 as a whole is: the closing force F p in the direction close to the static core 102, the elastic force F k1 from the core spring 104 in the direction away from the static core 102 k2 , the elastic force F k1 from the contact spring 109, and the friction force f, which satisfy equation (2): F k2 +F p +f=F .

[0035] In this stage, in addition to the same source as in the first closing stage, the main source of the friction force f is also related to the asynchronization between the contact of the multiple contact points of the moving contact 108 and the multiple contact points of the static contact 106. There are many reasons for the asynchronization between the contact of the multiple contact points of the moving contact 108 and the multiple contact points of the static contact 106, such as the reasons described above, such as the asynchronization between the contact points 1061 and 1062 of the moving contact 108 or the static contact 106 due to the poor assembly of the moving contact 108 or the static contact 106 or due to the loosening of the fasteners after the contactor is used for a certain number of times, etc. In this way, the moving contact 108 is prone to extrusion or friction with the adjacent parts in the upper base during the movement to achieve complete contact with the static contact 106. Of course, if there is no asynchronization between the contact of the multiple contact points, there is no such stage or the time of this stage is almost 0.

[0036] Therefore, in the case where the moving core 103 does not stick in the first closing stage, the size of the friction force f in this stage can reflect whether there is asynchronization between the contact of the multiple contact points of the moving contact 108 and the multiple contact points of the static contact 106.

[0037] In the third closing stage, i.e. the stage when all contacts of the moving contact 108 and the stationary contact 106 are in contact with the moving core 103 and the stationary core 102 are closed. After all contacts of the moving contact 108 and the stationary contact 106 are in contact, the moving core 103 and the moving core holder 107 continue to move towards the stationary core 102 under the continued action of the closing force F p . The force experienced by the moving core 103, the moving core holder 107 and the moving contact 108 as a whole still includes the closing force F p towards the stationary core 102, the elastic force F k1 from the core spring 104 away from the stationary core 102, the elastic force F k2 from the contact spring 109 and the friction force f, which still satisfy the equation (2): F k1 +F k2 +f=F p .

[0038] In this stage, the main source of the friction force f, in addition to the same source as in the first closing stage, is related to the imbalance of the moving contact 108. The imbalance of the moving contact 108 refers to that, after all contacts of the moving contact 108 and the stationary contact 106 are in contact respectively, the moving contact 108 and the stationary contact 106 are squeezed strongly due to the continued movement of the moving core 103 and the moving core holder 107 towards the stationary core 102. The respective surfaces of the contacts of the moving contact 108 and the stationary contact 106 are likely to be worn to different degrees due to past multiple uses, so that after all contacts are in contact, multiple contacts of the moving contact 108 (e.g. 1081 and 1082) are not on the same horizontal line. In this way, the moving contact 108 is prone to be squeezed or rubbed with the structure around it in the upper base 105.

[0039] Therefore, in the case that the moving core 103 does not appear to be stuck in the first closing stage, the size of the friction force f in this stage can reflect whether the moving contact 108 is imbalanced after multiple contacts of the moving contact 108 and multiple contacts of the stationary contact 106 are in contact.

[0040] The closing data from the first closing stage to the third closing stage, including the displacement S of the moving core 103 and the size of the closing force F p , can be collected by the analysis device 1000. As an example, the collected closing data can be fitted as follows: Figure 6AB segment of the curve ABCD in FIG. 10 corresponds to the pull-in data of the first pull-in stage, the BC segment corresponds to the pull-in data of the second pull-in stage, and the CD segment corresponds to the pull-in data of the third pull-in stage.

[0041] Referring back to Figure 3 , at step S320, the release force F is applied to the moving iron core 103 r to move the moving iron core 103 at a constant speed in a direction away from the stationary iron core 102 to perform a release process, and a plurality of release data is collected during the release process, the plurality of release data including the displacement of the moving iron core 103 and the magnitude of the release force F r during the release process. Step S320 is described below in conjunction with Figure 5 and Figure 6 .

[0042] Figure 5 is a schematic diagram of the main stages in the release process of the contactor 100 when the analysis method 300 for a contactor according to an embodiment of the present disclosure is used. For brevity, Figure 5 , the test platform, clamps 1-2, and analysis device 1000 shown in Figure 2 are omitted.

[0043] Referring back to Figure 5 , the position d is the same as the position d in Figure 4 , from the perspective of the release process, represents the position at which the moving iron core 103 starts to separate from the stationary iron core 102 and the contact spring 109 does not start to reset, the position e represents the position at which the moving contact 108 and the stationary contact 106 start to separate, the position f represents the position at which all the contacts of the moving contact 108 and the stationary contact 106 are separated, and the position g represents the position at which the moving contact 108 and the stationary contact 106 are open. Among them, the position b in Figure 4 corresponds to the position b in Figure 5 , the position e in Figure 5 does not necessarily occur and is not expected to occur. However, if the position b is passed during the pull-in stage, the position e will be correspondingly passed during the release stage. Also, for brevity, , only one pair of moving and stationary contacts is shown in

[0044] , but it should be understood that the number of moving and stationary contacts can be multiple.In the example where the release process sequentially goes through positions d, e, f and g, the release process can be divided into three stages: the first release stage from position d to position e, i.e. the stage from the beginning of the separation of the moving iron core and the static iron core to the stage where the moving contact and the static contact have contact point separation; the second release stage from position e to position f, i.e. the stage from the moving contact and the static contact having contact point separation to the stage where all the contact points are separated; and the third release stage from position f to position g, i.e. the stage from the moving contact and the static contact having all the contact points separated to the stage where the iron core spring is completely reset.

[0045] In the first release stage, i.e. the stage from the moving iron core 103 and the static iron core 102 starting to separate to the stage where the moving contact 108 and the static contact 106 have contact point separation. In this stage, the release force F r is applied to the moving iron core 103 by the analysis device 1000 r . It should be noted that the release process is actually a process of gradually reducing the external force applied to the moving iron core 104 over time so that the moving iron core 103 moves at a constant speed away from the static iron core, and therefore, the so-called "applying release force F p to the moving iron core 103" here does not mean that the attraction force F r is removed and then re-applied to the moving iron core 103 p . Rather, for the purpose of facilitating the description of the attraction process and the release process, the external force acting on the moving iron core in the attraction process is referred to as the attraction force F r , and the external force acting on the moving iron core in the release process is referred to as the release force F r . In this stage, the reset of the contact spring 109 drives the moving contact support 107 and the moving iron core 103 to move away from the static iron core 102. The force acting on the moving iron core 103, the moving contact support 107 and the moving contact 108 as a whole includes the release force F k1 pointing towards the static iron core 102, the elastic force F k2 from the iron core spring 104 and the elastic force F k1 from the contact spring 109, which satisfy equation (3): F k2 +F r +f. At this time, the main source of the friction force f is similar to the third attraction stage, which will not be described here again.

[0046] In the second release stage, i.e. the stage from the moving contact and the static contact having contact point separation to the stage where all the contact points are separated. The force acting on the moving iron core 103, the moving contact support 107 and the moving contact 108 as a whole still includes the release force F r pointing towards the static iron core 102, the elastic force F k1and the elastic force F from the contact spring 109 k2 These forces still satisfy equation (3): F k1 +F k2 =F r +f. At this stage, the main source of the friction force f is similar to that in the second attraction stage, which will not be repeated here. Also, if the separation between the multiple contacts of the moving contact 108 and the multiple contacts of the stationary contact 106 is not synchronized, this stage does not exist, or the time of this stage is almost 0.

[0047] In the third release stage, i.e., the stage from when all the contacts in the moving contact 108 and the stationary contact 106 are separated to when the core spring 104 is fully reset. At this stage, due to the initial reset of the moving core spring 104, the moving core 103, the moving contact support 107, and the moving contact 108 are pushed to move away from the stationary core 102, and the force on the moving core 103, the moving contact support 107, and the moving contact 108 as a whole includes the release force F r and the friction force f in the direction of the stationary core 102, and the elastic force F k1 from the core spring 104 in the direction away from the stationary core 102. These forces satisfy equation (4): F k1 =F r +f. At this stage, the main source of the friction force f is similar to that in the first attraction stage, which will not be repeated here.

[0048] The analysis device 1000 can collect release data from the first release stage to the third release stage, including the displacement S of the moving core 103 and the magnitude of the release force F r . As an example, the collected release data is fitted into a curve DEFA as shown in Figure 6 , where the DE segment in the curve DEFA corresponds to the release data of the first release stage, the EF segment corresponds to the release data of the second release stage, and the FA segment corresponds to the release data of the third release stage.

[0049] In addition, in the example where the release process only goes through the positions d, f, and g, the release process can be divided into two stages: the stage from position d to position f and the stage from position f to position g. These two stages are the same as the above first release stage and third release stage, respectively, which will not be repeated here.

[0050] Figure 7 is a further flowchart of step S330 in Figure 3 .

[0051] Referring to Figure 7Step S330 may include sub-step S331: determining whether the core spring 104 and contact spring 109 have failed based on multiple engagement data and multiple release data. Since the spring constant remains constant or changes very little during engagement and release under normal circumstances, the failure of the core spring 104 and contact spring 109 can be determined based on whether the changes in the spring constants of the core spring 104 and contact spring 109 during engagement and release are excessive.

[0052] Specifically, for the core spring 104, the elastic coefficient of the core spring 104 during the engagement process is determined based on the engagement data from the first engagement stage, which indicates the compression of the core spring 104 from the point of contact between the moving contact 108 and the stationary contact 106, collected in step S310. Similarly, the elastic coefficient of the core spring 104 during the release process is determined based on the release data from the third release stage, which indicates the separation of all contacts between the moving contact 108 and the stationary contact 106 from the point of complete reset of the core spring 104, collected in step S320. If the difference between the elastic coefficient of the core spring 104 during the engagement process and the elastic coefficient of the core spring 104 during the release process is greater than a first threshold T1, then the core spring 104 is determined to have failed.

[0053] by Figure 6 For example, the engagement data corresponding to the first engagement stage is segment AB in curve ABCD. The deformation of the core spring 104 during this period corresponds to the displacement S of the moving core 103 from point A to point B. AB Therefore, based on the engagement data of segment AB, the elastic coefficient of the iron core spring 104 during the engagement process can be determined as k1 = (F pB -F pA ) / S AB , of which F pB F represents the magnitude of the attraction force at point B. pA S represents the magnitude of the attraction force at point A. AB This represents the displacement between points A and B. Similarly, the release data corresponding to the third release stage is segment FA in curve DEFA, and the deformation of the core spring 104 during this period corresponds to the displacement S of the moving core 103 from point F to point A. FA Therefore, based on the release data of segment FA, the elastic coefficient of the core spring 104 during the release process can be determined as k1' = (F rF -F rA ) / S FA , of which F rF F represents the magnitude of the release force at point F. rA S represents the magnitude of the release force at point A. FAThis represents the displacement between points F and A. Then, the elastic coefficient k1 of the core spring 104 during the engagement process and the elastic coefficient k1' during the release process are compared. If the difference between k1 and k1' is greater than a first threshold T1, then the core spring 104 is determined to be faulty. The first threshold T1 can be determined based on parameters such as the diameter, wire diameter, and material of the core spring 104, or an empirical range related to its failure.

[0054] For the contact spring 109, the spring constant of the contact spring 104 during the closing process is determined based on the closing data of the third closing stage, which indicates that all contacts of the driven contact 108 and the stationary contact 106 are in contact with the moving iron core 103 and the stationary iron core 102 in the multiple closing data collected in step S310. Furthermore, the spring constant of the contact spring 104 during the release process is determined based on the release data of the first release stage, which indicates the separation from the moving iron core 103 and the stationary iron core 102 to the point where there is contact separation between the moving contact 108 and the stationary contact 106, collected in the multiple release data in step S320. If the difference between the spring constant of the contact spring 109 during the closing process and the spring constant of the contact spring 109 during the release process is greater than a second threshold T2, then the contact spring 109 is determined to have failed.

[0055] by Figure 6 For example, the engagement data corresponding to the third engagement stage is segment CD in curve ABCD. The deformation of the contact spring 109 and the core spring 104 during this period corresponds to the displacement S from point C to point D. CD Therefore, based on the engagement data of segment CD, the elastic coefficient of the contact spring 109 during the engagement process can be determined as k2 = [(F rD -F rC -k1*S CD ) / S CD ] / N, where F rD F represents the magnitude of the release force at point D. rC This indicates the magnitude of the release force at point C, k1 represents the spring constant of the iron core spring 104 (corresponding to the spring constant of the iron core spring 104 when it has not failed), and S CD This represents the displacement between points C and D, and N represents the number of contactor stages. It should be noted that when N is greater than 1, k2 represents the average elastic coefficient of multiple identical contact springs 109. Similarly, the release data corresponding to the first release stage is segment DE in curve DEFA, where the deformation of both contact spring 109 and core spring 104 during this period corresponds to the displacement S from point D to point E. DE Therefore, based on the release data of segment DE, the elastic coefficient of the contact spring 109 during the release process can be determined as k2' = [(F rD -F rE -k1*SDE ) / S DE ] / N, wherein F rD represents the magnitude of the release force at point D, F rE represents the magnitude of the release force at point E, S DE represents the displacement between points D and E. Then, the spring constant k2 of the contact spring 109 during the closing process is compared with the spring constant k2' of the contact spring 109 during the release process, and if the difference between k2 and k2' is greater than a first threshold value T2, it is determined that the contact spring 109 is faulty. The second threshold value T2 can be determined according to the diameter, wire diameter, material, etc. of the contact spring 109 or an empirical value range related to its failure.

[0056] Thus, after sub-step S331, if the core spring 104 and / or the contact spring 109 is determined to be faulty, a decision can be made to further inspect and replace the core spring 104 and / or the contact spring 109.

[0057] With reference to Figure 7 , in the case where the core spring 104 and the contact spring 109 are not faulty, step S330 can further include a sub-step S332 of determining whether the moving iron core is stuck based on the plurality of closing data and the plurality of release data in the case where the core spring and the contact spring are not faulty.

[0058] Specifically, the following operation can be performed to determine whether the moving iron core is stuck: determining the friction force existing in the contactor during a first closing phase indicating that the core spring 104 starts to compress to the moving contact 108 being in contact with the stationary contact 106 from the plurality of closing data and a third release phase indicating that all the contacts in the moving contact 108 and the stationary contact 106 are separated to the core spring 104 being completely reset from the plurality of release data, and determining that the moving iron core 103 is stuck in the case where the friction force at any displacement corresponding to the first closing phase and the third release phase is greater than a third threshold value T3.

[0059] Still taking Figure 6 as an example, the closing data corresponding to the first closing phase is the AB segment in the curve ABCD, and the release data corresponding to the third release phase is the FA segment in the curve DEFA. At any displacement in the AB segment and the FA segment, according to the foregoing equation (1) F k1 +f = F p and equation (4) F k1 = F r +f, the friction force f = (F p -F r) / 2. If the frictional force f at any displacement corresponding to segment AB and segment FA is greater than the third threshold T3, it can be determined that the moving iron core is stuck.

[0060] Therefore, after sub-step S332, if the moving iron core 103 is determined to be stuck, a decision can be made to further inspect the moving iron core 103 and its surrounding structure to eliminate the stuckness.

[0061] refer to Figure 7 Step S330 may also include sub-step S333: if there is no jamming in the moving iron core 103, determine whether there is contact asynchrony between the multiple contacts 1081, 1082 of the moving contact 108 and the multiple contacts 1061, 1062 of the stationary contact 106 based on multiple engagement data and multiple release data.

[0062] Specifically, the following operations can be performed to determine whether there is a contact asynchrony between the multiple contacts of the moving contact 108 and the multiple contacts of the stationary contact 106: based on the pull-in data in the pull-in data indicating the second pull-in phase from when some contacts in the driven contact 108 and the stationary contact 106 are in contact to when all contacts are in contact, and the release data in the multiple release data indicating the second release phase from when some contacts in the driven contact 108 and the stationary contact 106 are separated to when all contacts are separated, the frictional force present in the contactor during the second pull-in phase and the second release phase is determined, and if the frictional force at any displacement corresponding to the second pull-in phase and the second release phase is greater than a fourth threshold T4, it is determined that there is a contact asynchrony between the multiple contacts of the moving contact 108 and the multiple contacts of the stationary contact 106.

[0063] Still with Figure 6 For example, the pull-in data corresponding to the second pull-in stage is segment BC in curve ABCD, and the release data corresponding to the second release stage is segment EF in curve DEFA. At any displacement in segments BC and EF, according to the aforementioned equation (2)F k1 +F k2 +f=F p And equation (3)F k1 +F k2 =F r The frictional force f = (Fp - Fr) / 2 within the contactor at that displacement can be determined. If the frictional force f at any displacement in segments BC and EF is greater than the fourth threshold T4, it can be determined that there is a contact asynchrony between multiple contacts of the moving contact 108 and multiple contacts of the stationary contact 106. The threshold T4 can be determined based on an empirical range related to the frictional force within the contactor's internal mechanism that causes contactor failure.

[0064] Thus, after sub-step S333, if it is determined that the contacts 1081, 1082 of the moving contact 108 and the contacts 1061, 1062 of the stationary contact 106 are not synchronized, a decision can be made to further inspect the moving contact 108 and the stationary contact 106 and their surrounding structures. For example, including checking whether the moving contact 108 or the stationary contact 106 itself is assembled poorly, or whether the contacts 1061 and 1062 of the stationary contact 106 are not equal due to a loose fastener or the like.

[0065] With reference to Figure 7 , step S330 can further include a sub-step S334 of determining whether the moving contact is unbalanced after all its contacts and the contacts of the stationary contact are contacted, based on the plurality of make data and the plurality of release data, in the absence of the moving iron core being stuck.

[0066] In particular, the following operations can be performed to determine whether the moving contact 108 is unbalanced after all its contacts and the contacts of the stationary contact 106 are contacted: determining the friction force present within the contactor during the third make stage and the first release stage based on the make data of the plurality of make data indicative of the moving contact 108 and the stationary contact 106 being contacted from all the contacts therein to the moving iron core 103 and the stationary iron core 102 being closed and the release data of the plurality of release data indicative of the moving iron core 103 and the stationary iron core 102 being separated from the first release stage in which there is contact separation between the moving contact 108 and the stationary contact 106, determining that the moving contact 108 is unbalanced after all its contacts and the contacts of the stationary contact 106 are contacted in the case that the friction force present within the contactor at any displacement corresponding to the third make stage and the first release stage is greater than a fifth threshold T5.

[0067] Still taking Figure 6 as an example, the make data corresponding to the third make stage is the CD segment in the curve ABCD, and the release data corresponding to the first release stage is the DE segment in the curve DEFA. At any displacement in the CD segment and the DE segment, the friction force f present within the contactor at the displacement can be determined according to the aforementioned equations (2) Fk1+Fk2+f=Fp and (3) Fk1+Fk2=Fr+f, that is, f=(Fp-Fr) / 2. In the case that the friction force f at any displacement corresponding to the CD segment and the DE segment is greater than the fifth threshold T5, it can be determined that the moving contact 108 is unbalanced after all its contacts and the contacts of the stationary contact 106 are contacted.

[0068] Thus, after sub-step S334, if it is determined that the moving contact 108 is unbalanced, a decision can be made to further inspect the moving contact 108 and its surrounding structures.

[0069] Figure 8is the friction-displacement curve corresponding to the attraction / release force-displacement curve in Figure 6 .

[0070] In this example, the third threshold T3, the fourth threshold T4 and the fifth threshold T5 are all set to 10 N according to the experience value range related to the contactor internal mechanism friction force causing the contactor failure. Figure 8 corresponding to the AB segment or the FA segment in Figure 6 are both less than 5 N, less than the third threshold T3, it can be determined that the moving iron core 103 does not appear to be stuck. The displacement from about 7.7 mm to 8 mm corresponds to the CD segment and the DE segment in Figure 6 are both less than 5 N, less than the threshold T4, it can be determined that there is no asynchronization between the contact points of the moving contact 108 and the stationary contact 106. The displacement from about 8 mm to 12 mm corresponds to the BC segment and the EF segment in Figure 6 are both less than 10 N, less than the threshold T5, it can be determined that the moving contact 108 does not exist imbalance after all the contact points of the moving contact 108 and the contact points of the stationary contact 106 are contacted.

[0071] Referring back to Figure 3 , the analysis method 300 for the contactor according to the embodiments of the present disclosure can further include a step S340 and / or a step S350.

[0072] At the step S340, based on the plurality of attraction data, the maximum displacement of the moving iron core 103 in the attraction process is determined as the stroke of the contactor 100. Still taking Figure 6 as an example, the maximum displacement of the moving iron core 103 in the attraction process is the displacement from the point A to the point D, therefore, S AD is determined as the stroke of the contactor 100.

[0073] At the step S350, based on the attraction data in the plurality of attraction data indicating the third attraction stage in which all the contact points of the moving contact 108 and the stationary contact 106 are contacted to the moving iron core 103 and the stationary iron core 102 closed, the distance of the moving iron core 103 moved in the third attraction stage is determined as the overtravel of the contactor 100. Still taking Figure 6 as an example, the distance of the moving iron core 103 moved in the third attraction stage is the displacement from the point C to the point D, therefore, S CD is determined as the overtravel of the contactor 100.

[0074] Thus, by steps S340 and S350, the travel and overtravel of the contactor can be easily obtained. Compared with the conventional way of measuring the travel and overtravel of the contactor by using laser to act on the component of the contactor to generate the displacement-electrical signal curve of the component, the way of measuring the travel and overtravel of the contactor by the analysis method 300 according to the present disclosure using the collected closing data and opening data is simpler and more convenient.

[0075] Figures 9A to 9C Another example of the closing force / opening force-displacement curve obtained by using the analysis method 300 for contactors according to the embodiments of the present disclosure at different life stages of the contactor 100 is shown. In this example, the third threshold T3, the fourth threshold T4 and the fifth threshold T5 are all set to 10 N according to the experience value range related to the contactor internal mechanism friction causing the failure of the contactor.

[0076] Reference is made to Figure 9A which shows the closing force / opening force-displacement curve obtained by using the aforementioned analysis method 300 at the beginning stage of the life of the contactor 100, the ordinate represents the size of the closing force received by the moving iron core during the closing process and the opening force received by the moving iron core during the opening process, and the abscissa represents the displacement of the moving iron core during the closing and opening processes. The friction existing inside the contactor 100 at any displacement can be determined by the closing data and opening data as shown in the figure. For example, at about the displacement 6.7 mm corresponding to the first closing stage and the third opening stage, the friction f1 existing inside the contactor 100 is f1=(F p - F r ) / 2= (25-20) / 2=2.5N<T3; at about the displacement 8.3 mm corresponding to the second closing stage and the second opening stage, the friction f2 existing inside the contactor 100 is f2=(F p - F r ) / 2= (55-41) / 2=7N<T4; at about the displacement 11.2 mm corresponding to the third closing stage and the first opening stage, the friction f3 existing inside the contactor 100 is f3=(F p - F r ) / 2= (165-155) / 2=5N<T5. Since the friction calculated according to the curve shown in Figure 9A does not exceed the corresponding threshold, it can be determined that the internal mechanism of the contactor 100 does not fail during the closing process and the opening process.

[0077] Reference is made to Figure 9Bwhich shows the force / displacement plot for the pull-in force / release force using the analysis method 300 described above after the contactor 100 has experienced 100,000 pull-in and release cycles. Again, the frictional force present within the contactor 100 at any displacement can be determined from the pull-in and release data as shown. For example, at approximately 6.5 mm of displacement corresponding to the first pull-in phase and the third release phase, the frictional force f1= (F p -F r ) / 2 = (34 - 14) / 2 = 10 N = T3; at approximately 8.5 mm of displacement corresponding to the second pull-in phase and the second release phase, the frictional force f2= (F p -F r ) / 2 = (78 - 50) / 2 = 9 N < T4; and at approximately 10 mm of displacement corresponding to the third pull-in phase and the first release phase, the frictional force f3= (F p -F r ) / 2 = (159 - 127) / 2 = 16 N > T5. From f3> T5, it can be determined that the moving contact 108 is out of balance after all of its contacts are in contact with the stationary contact 106. A decision can then be made to further inspect the moving contact 108 and its surrounding structure.

[0078] Figure 9C which shows the force / displacement plot for the pull-in force / release force using the analysis method 300 described above after the contactor 100 has experienced 100,000 pull-in and release cycles. Again, the frictional force present within the contactor 100 at any displacement can be determined from the pull-in and release data as shown. For example, at approximately 6.5 mm of displacement corresponding to the first pull-in phase and the third release phase, the frictional force f1= (F p -F r ) / 2 = (28 - 16) / 2 = 6 N < T3; at approximately 8.2 mm of displacement corresponding to the second pull-in phase and the second release phase, the frictional force f2= (F p -F r ) / 2 = (68 - 32) / 2 = 18 N > T4; and at approximately 10 mm of displacement corresponding to the third pull-in phase and the first release phase, the frictional force f3= (F p -F r) / 2 = (154 - 130) / 2 = 12 N > T5. According to f2 > T4, it can be determined that the contact between the contacts of the moving contact 108 and the contacts of the stationary contact 106 is out of synchronization, and according to f3 > T5, it can be determined that the moving contact 108 is unbalanced after all the contacts of the moving contact 108 are in contact with the contacts of the stationary contact 106. In addition, Figure 9C The two oval marks in the curve indicate that a "knee point" appears in the curve, that is, the change of the attraction force or the release force is not smooth, which is also caused by the contact between the contacts of the moving contact 108 and the contacts of the stationary contact 106 out of synchronization, for example, three pairs of moving contacts 108 and stationary contacts 106 corresponding to each phase of the three-phase power source are not in contact at the same time, but are contacted in turn. Thus, a decision can be made to further check the moving contact 108, the stationary contact 106 and the surrounding structure.

[0079] The analysis method 300 for the contactor according to an aspect of the present disclosure is described above in combination with Figures 3 to 9C The analysis device 1000 for the contactor according to another aspect of the present disclosure is described below in combination with Figure 10

[0080] Figure 10 is a structural block diagram of the analysis device 1000 for the contactor according to an embodiment of the present disclosure.

[0081] Referring to Figure 10 , the analysis device 1000 for the contactor 100 includes a driving unit 1010, an acquisition unit 1020 and a processing unit 1030. The driving unit 1010 is configured to apply an attraction force F p to the moving iron core 103 to move the moving iron core 103 at a constant speed towards the stationary iron core 102 to perform an attraction process, and to apply a release force F r to the moving iron core 103 to move the moving iron core 103 at a constant speed away from the stationary iron core 102 to perform a release process. The acquisition unit 1020 is configured to acquire a plurality of attraction data in the attraction process, and to acquire a plurality of release data in the release process, the plurality of attraction data including a displacement of the moving iron core 103 and a size of the attraction force F p in the attraction process, and the plurality of release data including a displacement of the moving iron core and a size of the release force F r ​The processing unit 1030 is configured to determine whether a fault exists inside the contactor 100 based on the plurality of pull-in data and the plurality of release data. In addition, the processing unit 1030 is configured to determine a maximum displacement of the armature 103 during the pull-in process as a travel of the contactor 100 based on the plurality of pull-in data, and determine a distance that the armature 103 moves in a third pull-in phase indicating that all contacts in the moving contact 108 and the stationary contact 106 are in contact with the armature 103 and the stationary core 102 closed as an overtravel of the contactor 100 based on the pull-in data of the plurality of pull-in data indicating the third pull-in phase.

[0082] The processing unit 1030 includes a spring analysis module 1031, an armature analysis module 1032, a contact touch analysis module 1033, and a moving contact balance analysis module 1034.

[0083] The spring analysis module 1031 is configured to determine whether the core spring 104 and the contact spring 109 are failed based on the plurality of pull-in data and the plurality of release data.

[0084] The spring analysis module 1031 determines whether the core spring 104 is failed by determining a spring constant of the core spring 104 during the pull-in process based on the pull-in data of the plurality of pull-in data indicating a first pull-in phase from the core spring 104 starts to compress to the moving contact 108 and the stationary contact 106 having contacts in contact, and determining a spring constant of the core spring 104 during the release process based on the release data of the plurality of release data indicating a third release phase from the moving contact 108 and the stationary contact 106 having all contacts separated to the core spring 104 completely reset, and determining that the core spring 104 is failed if a difference between the spring constant of the core spring 104 during the pull-in process and the spring constant of the core spring 104 during the release process is greater than a first threshold T1.

[0085] The spring analysis module 1031 determines whether the contact spring 109 is failed by determining a spring constant of the contact spring 109 during the pull-in process based on the pull-in data of the plurality of pull-in data indicating a third pull-in phase from the moving contact 108 and the stationary contact 106 having all contacts in contact to the armature 103 and the stationary core 102 closed, and determining a spring constant of the contact spring 109 during the release process based on the release data of the plurality of release data indicating a first release phase from the armature 103 and the stationary core 102 starts to separate to the moving contact 108 and the stationary contact 106 having contacts separated, and determining that the contact spring 109 is failed if a difference between the spring constant of the contact spring 109 during the pull-in process and the spring constant of the contact spring 109 during the release process is greater than a second threshold T2, when the core spring 104 is not failed.

[0086] The moving iron core analysis module 1032 is configured to determine whether the moving iron core 103 is stuck based on the plurality of make data and the plurality of release data in the event that the iron core spring 104 and the contact spring 109 are not failed. Specifically, the moving iron core analysis module 1032 determines whether the moving iron core 103 is stuck by performing the following operations: determining the frictional force present within the contactor during a first make-up stage indicating the compression of the iron core spring 104 to the point of contact of the moving contact 108 with the stationary contact 106 and a third release stage indicating the disconnection of all the contacts of the moving contact 108 from the stationary contact 106 to the complete reset of the iron core spring 104 based on the make-up data in the plurality of make data and the release data in the plurality of release data, and determining that the moving iron core 103 is stuck in the event that the frictional force at any displacement corresponding to the first make-up stage and the third release stage is greater than a third threshold value T3.

[0087] The contact contact analysis module 1033 is configured to determine whether there is contact desynchronization between the plurality of contacts of the moving contact 108 and the plurality of contacts of the stationary contact in the event that the iron core spring 104 and the contact spring 109 are not failed based on the plurality of make data and the plurality of release data. Specifically, the contact contact analysis module 1033 determines whether there is contact desynchronization between the plurality of contacts of the moving contact 108 and the plurality of contacts of the stationary contact by performing the following operations: determining the frictional force present within the contactor during a second make-up stage indicating the contact of all the contacts of the moving contact 108 with the stationary contact 106 and a second release stage indicating the disconnection of all the contacts of the moving contact 108 from the stationary contact 106 based on the make-up data in the plurality of make data and the release data in the plurality of release data, and determining that there is contact desynchronization between the plurality of contacts of the moving contact 108 and the plurality of contacts of the stationary contact 106 in the event that the frictional force at any displacement corresponding to the second make-up stage and the second release stage is greater than a fourth threshold value T4.

[0088] As described above in conjunction with Figures 3 to 9C As the operations performed by the analysis device 1000 have been described in detail in describing the analysis method 300 for the contactor according to the present disclosure, the description thereof will not be repeated here.

[0089] The analysis method 300 for contactors and the analysis device 1000 for contactors according to the embodiments of the present disclosure are simple and easy methods and devices capable of performing static analysis of contactor characteristics at various life stages of the contactors. The contactors perform the attraction process and the release process by applying the attraction force and the release force to the moving iron core of the contactors, and the friction force of the internal mechanism of the contactors is calculated using the attraction data and the release data collected during the attraction process and the release process, and then the motion state of the internal mechanism of the contactors is determined according to the size of the friction force, and it is determined whether the internal mechanism of the contactors has problems such as failure of the iron core spring and / or the contact spring, existence of the stuck of the moving iron core, existence of the contact asynchronization between the plurality of contacts of the moving contact and the plurality of contacts of the static contact, and existence of the imbalance of the moving contact after all the contacts of the moving contact are in contact with the contacts of the static contact. In addition, the stroke and the overstroke of the contactors can also be easily obtained according to the collected attraction data and the release data. Compared with the conventional method of measuring the stroke and the overstroke of the contactors by using the laser to act on the components of the contactors to generate the displacement-electrical signal curve of the components, the method of obtaining the stroke and the overstroke of the contactors according to the present disclosure is simpler and easier to implement.

[0090] The schematic diagrams of the systems and the flowcharts of the methods according to the present disclosure are only exemplary examples and are not intended to require or imply that the connections and arrangements shown in the flowcharts and the schematic diagrams must be made, arranged. As those skilled in the art will recognize, these devices and apparatuses can be connected and arranged in any way as long as the desired purpose can be achieved.

[0091] Those skilled in the art should understand that the above specific embodiments are only examples and are not limiting, and various modifications, combinations, partial combinations and replacements of the embodiments of the present disclosure can be made according to design requirements and other factors, as long as they are within the scope of the appended claims or their equivalents, i.e. within the scope of the rights to be protected by the present disclosure.

Claims

1. An analysis method for a contactor, the contactor comprising a stationary iron core, a moving iron core opposite to the stationary iron core, and an iron core spring disposed between the stationary iron core and the moving iron core, the contactor further comprising a stationary contact having multiple contacts, a moving contact having multiple contacts opposite to the stationary contact, a moving contact support disposed on the moving iron core, and a contact spring connecting the moving contact support and the moving contact, wherein when the moving iron core moves toward the stationary iron core, the moving contact support drives the multiple contacts of the moving contact to contact the multiple contacts of the stationary contact respectively, the analysis method comprising: When the contactor is de-energized, a pulling force is applied to the moving iron core to make the moving iron core move at a constant speed toward the stationary iron core, thereby performing the pulling process. During the pulling process, multiple pulling data are collected, including the displacement of the moving iron core and the magnitude of the pulling force. When the contactor is de-energized, a release force is applied to the moving iron core to make the moving iron core move at a constant speed away from the stationary iron core, thereby performing a release process. During the release process, multiple release data are collected, including the displacement of the moving iron core and the magnitude of the release force. as well as Based on the multiple engagement data and the multiple release data, it is determined whether there is a fault inside the contactor. Specifically, determining whether there is a fault inside the contactor based on the multiple engagement data and the multiple release data includes: determining whether the core spring and the contact spring have failed based on the multiple engagement data and the multiple release data.

2. The analytical method according to claim 1, wherein, Determining whether there is an internal fault in the contactor based on the multiple engagement data and the multiple release data also includes: If the core spring and the contact spring are not faulty, determine whether the moving core is stuck based on the multiple engagement data and the multiple release data.

3. The analytical method according to claim 2, wherein, Determining whether there is an internal fault in the contactor based on the multiple engagement data and the multiple release data also includes: If the moving iron core is not stuck, the multiple engagement data and the multiple release data determine whether there is a lack of synchronization in contact between the multiple contacts of the moving contact and the multiple contacts of the stationary contact.

4. The analytical method according to claim 2, wherein, Determining whether there is an internal fault in the contactor based on the multiple engagement data and the multiple release data also includes: If the moving iron core is not stuck, determine whether there is an imbalance after all the moving contacts and the stationary contacts have made contact, based on the multiple engagement data and the multiple release data.

5. The analytical method according to claim 1, wherein, Determining whether the core spring and the contact spring have failed based on the multiple engagement data and the multiple release data includes: The spring constant of the core spring during the engagement process is determined based on the engagement data indicating the first engagement stage from the start of compression of the core spring to contact between the moving contact and the stationary contact. The spring constant of the core spring during the release process is determined based on the release data indicating the third release stage from the separation of all contacts between the moving contact and the stationary contact to the complete reset of the core spring. If the difference between the spring constant of the core spring during the engagement process and the spring constant of the core spring during the release process is greater than a first threshold, the core spring is determined to have failed. If the core spring is not faulty, the spring constant of the contact spring during the engagement process is determined based on the engagement data indicating the third engagement stage from the contact of all points between the moving contact and the stationary contact to the closure of the moving core and the stationary core, as indicated by the plurality of engagement data. The spring constant of the contact spring during the release process is determined based on the release data indicating the first release stage from the separation of the moving core and the stationary core to the point of contact separation between the moving contact and the stationary contact, as indicated by the plurality of release data. If the difference between the spring constant of the contact spring during the engagement process and the spring constant of the contact spring during the release process is greater than a second threshold, the contact spring is determined to have failed.

6. The analytical method according to claim 2, wherein, Determining whether the moving iron core is stuck based on the multiple engagement data and the multiple release data includes: Based on the engagement data indicating the first engagement phase from the start of compression of the core spring to contact between the moving contact and the stationary contact, and the release data indicating the third release phase from the separation of all contacts between the moving contact and the stationary contact to the complete reset of the core spring, the frictional force present in the contactor during the first engagement phase and the third release phase is determined. If the frictional force at any displacement corresponding to either the first engagement phase or the third release phase is greater than a third threshold, it is determined that the moving core is stuck.

7. The analytical method according to claim 3, wherein, Based on the multiple engagement data and the multiple release data, determine whether there is a contact asynchrony between the multiple contacts of the moving contact and the multiple contacts of the stationary contact: Based on the engagement data (the engagement data indicating the second engagement phase from contact between the moving and stationary contacts to contact between all contacts) and the release data (the release data indicating the second release phase from contact separation between the moving and stationary contacts to separation between all contacts), the frictional force present in the contactor during the second engagement and second release phases is determined. If the frictional force at any displacement corresponding to the second engagement and second release phases is greater than a fourth threshold, a contact asynchrony between the multiple contacts of the moving contact and the multiple contacts of the stationary contact is determined.

8. The analytical method according to claim 4, wherein, Determining whether there is an imbalance between the moving contact and the stationary contact after all its contacts have made contact, based on the multiple engagement data and the multiple release data, includes: Based on the engagement data indicating the third engagement phase from the contact of all contacts between the moving contact and the stationary contact to the closure of the moving core and the stationary core, and the release data indicating the first release phase from the separation of the moving core and the stationary core to the contact separation of the moving contact and the stationary contact, the frictional force present in the contactor during the third engagement phase and the first release phase is determined. If the frictional force at any displacement corresponding to the third engagement phase and the first release phase is greater than a fifth threshold, it is determined that the moving contact has an imbalance after all its contacts and the stationary contact have made contact.

9. The analytical method according to claim 1, further comprising: Based on the multiple engagement data, the maximum displacement of the moving iron core during the engagement process is determined as the stroke of the contactor.

10. The analytical method according to claim 1, further comprising: Based on the engagement data in the plurality of engagement data indicating the engagement stage from the contact of all contacts between the moving contact and the stationary contact to the closing of the moving core and the stationary core, the distance the moving core moves in the third engagement stage is determined as the overtravel of the contactor.

11. An analytical device for a contactor, the contactor comprising a stationary iron core, a moving iron core opposite to the stationary iron core, and an iron core spring disposed between the stationary iron core and the moving iron core, the contactor further comprising a stationary contact having multiple contacts, a moving contact having multiple contacts opposite to the stationary contact, a moving contact support disposed on the moving iron core, and a contact spring connecting the moving contact support and the moving contact, wherein when the moving iron core moves toward the stationary iron core, the moving contact support drives the multiple contacts of the moving contact to contact the multiple contacts of the stationary contact respectively, the analytical device comprising: The drive unit is configured to apply a pulling force to the moving iron core when the contactor is de-energized, so that the moving iron core moves at a constant speed toward the stationary iron core to perform the pulling process; and to apply a releasing force to the moving iron core when the contactor is de-energized, so that the moving iron core moves at a constant speed away from the stationary iron core to perform the releasing process. A data acquisition unit is used to acquire multiple attraction data during the attraction process and multiple release data during the release process. The multiple attraction data includes the displacement of the moving iron core and the magnitude of the attraction force during the attraction process, and the multiple release data includes the displacement of the moving iron core and the magnitude of the release force during the release process. as well as The processing unit is used to determine whether there is a fault inside the contactor based on the plurality of engagement data and the plurality of release data. The processing unit includes a spring analysis module, used to determine whether the core spring and the contact spring have failed based on the multiple engagement data and the multiple release data.

12. The analytical apparatus according to claim 11, wherein, The processing unit further includes a moving iron core analysis module, which is used to determine whether the moving iron core is stuck based on the multiple engagement data and the multiple release data when the spring analysis module determines that the iron core spring and the contact spring are not faulty.

13. The analytical apparatus according to claim 12, wherein, The processing unit further includes a contact analysis module, which is used to determine, based on the multiple engagement data and the multiple release data, whether there is a contact asynchrony between the multiple contacts of the moving contact and the multiple contacts of the stationary contact, when the moving iron core analysis module determines that the moving iron core is not stuck.

14. The analytical apparatus according to claim 12, wherein, The processing unit further includes a moving contact balance analysis module, which is used to determine, based on the multiple engagement data and the multiple release data, whether the moving contact has an imbalance after all its contact points and the contact points of the stationary contact have made contact, when the moving iron core analysis module determines that the moving iron core is not stuck.

15. The analytical apparatus according to claim 11, wherein, The spring analysis module performs the following operations to determine whether the core spring and the contact spring have failed: The spring constant of the core spring during the engagement process is determined based on the engagement data indicating the first engagement stage from the start of compression of the core spring to the point of contact between the moving contact and the stationary contact. The spring constant of the core spring during the release process is determined based on the release data indicating the third release stage from the separation of all contacts between the moving contact and the stationary contact to the complete reset of the core spring. If the difference between the spring constant of the core spring during the engagement process and the spring constant of the core spring during the release process is greater than a first threshold, the core spring is determined to have failed. as well as If the core spring is not faulty, the spring constant of the contact spring during the engagement process is determined based on the engagement data indicating the third engagement stage from the contact of all points between the moving contact and the stationary contact to the closure of the moving core and the stationary core, as indicated by the plurality of engagement data. The spring constant of the contact spring during the release process is determined based on the release data indicating the first release stage from the separation of the moving core and the stationary core to the point of contact separation between the moving contact and the stationary contact, as indicated by the plurality of release data. If the difference between the spring constant of the contact spring during the engagement process and the spring constant of the contact spring during the release process is greater than a second threshold, the contact spring is determined to have failed.

16. The analytical apparatus according to claim 12, wherein, The moving iron core analysis module performs the following operations to determine whether the moving iron core is stuck: Based on the engagement data indicating the first engagement phase from the start of compression of the core spring to contact between the moving contact and the stationary contact, and the release data indicating the third release phase from separation of all contacts between the moving contact and the stationary contact to the complete reset of the core spring, the frictional force present in the contactor during the first engagement phase and the third release phase is determined. If the frictional force at any displacement corresponding to either the first engagement phase or the third release phase is greater than a third threshold, it is determined that the moving core is stuck.

17. The analytical apparatus according to claim 13, wherein, The contact analysis module performs the following operations to determine whether there is a contact asynchrony between multiple contacts of the moving contact and multiple contacts of the stationary contact: Based on the pull-in data indicating a second pull-in phase from contact between the moving and stationary contacts to contact between all contacts in the pull-in data and the release data indicating a second release phase from separation between the moving and stationary contacts to separation between all contacts in the multiple release data, the frictional force present in the contactor during the second pull-in and second release phases is determined. If the frictional force at any displacement corresponding to the second pull-in and second release phases is greater than a fourth threshold, a contact asynchrony is determined to exist between the multiple contacts of the moving contact and the multiple contacts of the stationary contact.

18. The analytical apparatus according to claim 14, wherein, The moving contact balance analysis module performs the following operations to determine whether the moving contact is unbalanced after all its contacts and the stationary contact have made contact: Based on the engagement data indicating the third engagement phase from when all contacts of the moving contact and the stationary contact are in contact with the moving core and the stationary core, and the release data indicating the first release phase from when the moving core and the stationary core begin to separate to when there is contact separation between the moving contact and the stationary contact, the frictional force present in the contactor during the third engagement phase and the first release phase is determined. If the frictional force at any displacement corresponding to the third engagement phase and the first release phase is greater than a fifth threshold, it is determined that the moving contact has an imbalance after all its contacts and the stationary contact have made contact.

19. The analysis device according to claim 11, wherein the processing unit is further configured to determine, based on the plurality of engagement data, the maximum displacement of the moving iron core during the engagement process as the stroke of the contactor.

20. The analysis device according to claim 11, wherein the processing unit is further configured to determine, based on the engagement data indicating a third engagement stage in which all contacts of the moving contact and the stationary contact are in contact with the moving core and the stationary core are closed, the distance the moving core moves in the third engagement stage as the overtravel of the contactor.

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