Electromagnetic suction calculation method, device and readable storage medium

Abstract

The application provides an electromagnetic attraction calculation method and device and a readable storage medium. The electromagnetic attraction calculation method calculates the release voltage and the total counterforce, and updates a preset electromagnetic system model according to the release voltage and the total counterforce, so that the electromagnetic characteristics of the updated electromagnetic system model are consistent with the actual electromagnetic characteristics of the contactor, thereby improving the accuracy of the calculated electromagnetic attraction curve of the contactor. In addition, by inputting the working condition parameters for representing the electrical parameters of the coil unit into the updated electromagnetic system model, the electromagnetic attraction curve under the working condition parameters can be determined, thereby efficiently calculating the electromagnetic attraction curve and making the electromagnetic attraction curve accurately reflect the relationship between the attraction and counterforce characteristics of the alternating current contactor and the position of the moving and static iron cores.

Description

Technical Field

[0001] This invention relates to the field of power equipment, and more particularly to a method, device, and readable storage medium for calculating electromagnetic attraction force. Background Technology

[0002] An AC contactor is an industrial electrical device that enables frequent switching on and off of the main circuit via remote control. It is primarily used in industrial equipment such as AC motors, electric heating devices, and capacitors. Contactors are a crucial component of automatic control systems; therefore, ensuring the stable and reliable operation of AC contactors is paramount. The dynamic performance parameters of an AC contactor are determined by the attraction and reaction force characteristics of its electromagnetic system, and the calculation of this attraction and reaction force is an essential part of electromagnetic system design.

[0003] Because the voltage across the excitation coil of an AC contactor varies sinusoidally with time, the electromagnetic attraction between the moving and stationary iron cores exhibits pulsating characteristics. When the electromagnetic attraction between the moving and stationary iron cores is less than the spring reaction force in the electromagnetic system, the moving and stationary iron cores separate; when the electromagnetic attraction between the moving and stationary iron cores is greater than the spring reaction force in the electromagnetic system, the moving and stationary iron cores return to their original engaged position. The electromagnetic attraction curve reflects the relationship between the attraction and reaction characteristics of the AC contactor and the positions of the moving and stationary iron cores. Therefore, if the electromagnetic attraction curve of the AC contactor is not accurately calculated, it will lead to improper matching of the attraction and reaction characteristics of the AC contactor, thereby causing vibration of the contactor contact system, resulting in contact wear, and ultimately a serious accident of contact welding. However, the related technologies for calculating the electromagnetic attraction curve are inefficient and have poor accuracy, failing to meet the industry's needs. Summary of the Invention

[0004] The following is an overview of the subject matter described in detail herein. This overview is not intended to limit the scope of the claims.

[0005] This invention provides a method, device, and readable storage medium for calculating electromagnetic attraction force, which can efficiently and accurately calculate the electromagnetic attraction force curve of a contactor.

[0006] In a first aspect, embodiments of the present invention provide an electromagnetic attraction force calculation method applied to a contactor. The contactor includes a moving iron core unit, a stationary iron core unit, and a coil unit. The coil unit is disposed between the moving iron core unit and the stationary iron core unit. The coil unit is used to generate an electromagnetic attraction force to make the moving iron core unit and the stationary iron core unit attract each other. The method includes:

[0007] Obtain the release voltage, which is used to characterize the voltage of the coil unit when the moving iron core unit changes from an attracted state to a released state with the stationary iron core unit;

[0008] Obtain the total reaction force, which is used to characterize the force that the moving iron core unit experiences in the opposite direction to the electromagnetic attraction force when the moving iron core unit is attracted to the stationary iron core unit by the electromagnetic attraction force.

[0009] The preset electromagnetic system model is updated based on the release voltage and the total reaction force, so that the electromagnetic characteristics of the updated electromagnetic system model are consistent with those of the contactor, wherein the electromagnetic system model corresponds to the contactor;

[0010] The preset operating condition parameters are input into the updated electromagnetic system model to determine the electromagnetic attraction curve, wherein the operating condition parameters are used to characterize the electrical parameters of the coil unit, and the electromagnetic attraction curve is used to characterize the mapping relationship between the magnitude of the electromagnetic attraction and the position of the moving iron core unit.

[0011] In a second aspect, embodiments of the present invention provide an electromagnetic attraction force calculation device, including a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, it implements the electromagnetic attraction force calculation method as described in the first aspect embodiment above.

[0012] Thirdly, embodiments of the present invention provide a computer-readable storage medium storing computer-executable instructions for causing a computer to perform the electromagnetic attraction force calculation method as described in the first aspect embodiment above.

[0013] This invention includes: acquiring a release voltage, which characterizes the voltage of the coil unit when the moving iron core unit changes from an attracted state to a released state with the stationary iron core unit; acquiring a total reaction force, which characterizes the force opposite to the direction of the electromagnetic attraction force experienced by the moving iron core unit when it is attracted to the stationary iron core unit by the electromagnetic attraction force; updating a preset electromagnetic system model based on the release voltage and the total reaction force, such that the electromagnetic characteristics of the updated electromagnetic system model are consistent with those of the contactor, wherein the electromagnetic system model corresponds to the contactor; and inputting preset operating condition parameters into the updated electromagnetic system model to determine an electromagnetic attraction force curve, wherein the operating condition parameters characterize the electrical parameters of the coil unit, and the electromagnetic attraction force curve characterizes the mapping relationship between the magnitude of the electromagnetic attraction force and the position of the moving iron core unit. According to the solution provided by the embodiments of the present invention, by calculating the release voltage and total reaction force, and updating the preset electromagnetic system model based on the release voltage and total reaction force, the electromagnetic characteristics of the updated electromagnetic system model can be consistent with the actual electromagnetic characteristics of the contactor, thereby improving the accuracy of calculating the electromagnetic attraction curve of the contactor. In addition, by inputting the operating condition parameters used to characterize the electrical parameters of the coil unit into the updated electromagnetic system model, the electromagnetic attraction curve under the operating condition parameters can be determined, thereby efficiently realizing the calculation of the electromagnetic attraction curve, and enabling the electromagnetic attraction curve to accurately reflect the relationship between the attraction and reaction force characteristics of the AC contactor and the positions of the moving and stationary iron cores.

[0014] Other features and advantages of the invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention may be realized and obtained by means of what is particularly pointed out in the description, claims and drawings. Attached Figure Description

[0015] The accompanying drawings are provided to further understand the technical solutions of the present invention and constitute a part of the specification. They are used together with the embodiments of the present invention to explain the technical solutions of the present invention, and do not constitute a limitation on the technical solutions of the present invention.

[0016] Figure 1 This is a schematic diagram of the structure of a contactor provided in one embodiment of the present invention;

[0017] Figure 2 This is a flowchart of an electromagnetic attraction force calculation method provided in one embodiment of the present invention;

[0018] Figure 3 yes Figure 2 A detailed flowchart of step S100;

[0019] Figure 4 yes Figure 2 The detailed flowchart of step S200;

[0020] Figure 5 yes Figure 2 The detailed flowchart of step S300;

[0021] Figure 6 yes Figure 5 The detailed flowchart of step S320;

[0022] Figure 7 This is a schematic diagram of an electromagnetic attraction force measuring device provided in one embodiment of the present invention. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0024] It should be noted that although functional modules are divided in the device schematic diagram and a logical order is shown in the flowchart, in some cases, the steps shown or described may be performed in a different order than the module division in the device or the order in the flowchart. The terms "first," "second," etc., in the specification, claims, and the aforementioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence.

[0025] This invention provides a method for calculating electromagnetic attraction force, comprising: acquiring a release voltage, which characterizes the voltage of the coil unit when the moving iron core unit changes from an attracted state to a released state with the stationary iron core unit; acquiring a total reaction force, which characterizes the force on the moving iron core unit opposite to the direction of the electromagnetic attraction force when the moving iron core unit is attracted to the stationary iron core unit by the electromagnetic attraction force; updating a preset electromagnetic system model based on the release voltage and the total reaction force, such that the electromagnetic characteristics of the updated electromagnetic system model are consistent with those of a contactor, wherein the electromagnetic system model corresponds to the contactor; and inputting preset operating condition parameters into the updated electromagnetic system model to determine an electromagnetic attraction force curve, wherein the operating condition parameters characterize the electrical parameters of the coil unit, and the electromagnetic attraction force curve characterizes the mapping relationship between the magnitude of the electromagnetic attraction force and the position of the moving iron core unit. According to the solution provided by the embodiments of the present invention, by calculating the release voltage and total reaction force, and updating the preset electromagnetic system model based on the release voltage and total reaction force, the electromagnetic characteristics of the updated electromagnetic system model can be consistent with the actual electromagnetic characteristics of the contactor, thereby improving the accuracy of calculating the electromagnetic attraction curve of the contactor. In addition, by inputting the operating condition parameters used to characterize the electrical parameters of the coil unit into the updated electromagnetic system model, the electromagnetic attraction curve under the operating condition parameters can be determined, thereby efficiently realizing the calculation of the electromagnetic attraction curve, and enabling the electromagnetic attraction curve to accurately reflect the relationship between the attraction and reaction force characteristics of the AC contactor and the positions of the moving and stationary iron cores.

[0026] The embodiments of the present invention will be further described below with reference to the accompanying drawings.

[0027] Figure 1 This is a schematic diagram of the structure of a contactor 100 provided in one embodiment of the present invention. Figure 1 In the example, the contactor 100 includes a moving iron core unit 101, a stationary iron core unit 102, and a coil unit. The coil unit is disposed between the moving iron core unit 101 and the stationary iron core unit 102. The coil unit is used to generate electromagnetic attraction to make the moving iron core unit 101 and the stationary iron core unit 102 attract each other.

[0028] Reference Figure 1 The AC contactor 100 also includes a contact support 103, which is connected to the moving iron core unit 101 and moves synchronously with the movement of the moving iron core unit 101.

[0029] In one embodiment, when measuring the total reaction force, the contactor 100 is mounted on a horizontally set workbench, and the total reaction force is measured by a force gauge. The total reaction force is used to characterize the force that the moving iron core unit 101 experiences in the opposite direction to the electromagnetic attraction force when it is attracted to the stationary iron core unit 102 by electromagnetic attraction.

[0030] Specifically, the force gauge includes a pin. When measuring the total reaction force, the force gauge is fixed so that when the moving iron core unit 101 and the stationary iron core unit 102 are in the attracted state, the pin of the force gauge abuts against the top of the contact bracket 103 and the force gauge is set to zero. After the power supply to the coil unit is disconnected, the moving iron core unit and the stationary iron core unit 102 will change from the attracted state to the released state. Since the contact bracket 103 is connected to the moving iron core unit 101 and moves synchronously with the movement of the moving iron core unit 101, the total reaction force can be transferred to the pin of the force gauge through the contact bracket 103 by abutting the pin of the force gauge against the top of the contact bracket 103. Therefore, the embodiments of the present invention do not require expensive sensors, data acquisition systems and complex data post-processing programs. It only requires using a force gauge to measure the reaction force of the moving iron core unit 101 and using an oscilloscope to measure the electrical parameters of the coil unit to complete the necessary data acquisition.

[0031] Furthermore, since the contactor 100 is mounted on a horizontally positioned workbench, and the contact support 103 can only move up and down with the moving iron core unit 101, the force gauge can accurately measure the total reaction force.

[0032] It should be noted that the attracted state refers to the state in which the moving iron core unit 101 and the stationary iron core unit 102 are in contact under the electromagnetic attraction generated by the coil unit, and the released state refers to the state in which the moving iron core unit 101 and the stationary iron core unit 102 are not in contact.

[0033] It should be noted that the coil unit is connected to a programmable power supply. The programmable power supply can change the electrical parameters to make the coil unit exhibit different operating characteristics. For example, the programmable power supply can change the voltage, current and voltage frequency input to the coil unit, and the programmable power supply can change the electrical parameters over time.

[0034] It should be noted that a force gauge can be used to measure the total reaction force, or other equipment can be used to measure the total reaction force. This embodiment of the invention does not make any specific limitation on this.

[0035] It should be noted that an oscilloscope can be used to measure the electrical parameters of the coil unit, or other devices can be used to measure the electrical parameters. This embodiment of the invention does not make any specific limitation on this.

[0036] The virtualization system and application scenarios described in the embodiments of this invention are for the purpose of more clearly illustrating the technical solutions of the embodiments of this invention, and do not constitute a limitation on the technical solutions provided by the embodiments of this invention. Those skilled in the art will know that with the evolution of electromagnetic attraction force measurement methods and contactor 100 and the emergence of new application scenarios, the technical solutions provided by the embodiments of this invention are also applicable to similar technical problems.

[0037] It will be understood by those skilled in the art that Figure 1The contactor 100 shown is not intended to limit the embodiments of the present invention and may include more or fewer components than shown, or combine certain components, or have different component arrangements.

[0038] Based on the contactor described above, various embodiments of the electromagnetic attraction force calculation method of the present invention are presented below.

[0039] like Figure 2 As shown, Figure 2 This is a flowchart of an electromagnetic attraction force calculation method provided in an embodiment of the present invention. Figure 2 In the example, the electromagnetic attraction force calculation method of the present invention includes, but is not limited to, steps S100, S200, S300 and S400.

[0040] Step S100: Obtain the release voltage. The release voltage is used to characterize the voltage of the coil unit when the moving iron core unit changes from the attracted state to the released state with the stationary iron core unit.

[0041] Step S200: Obtain the total reaction force. The total reaction force is used to characterize the force that the moving iron core unit experiences in the opposite direction of the electromagnetic attraction when the moving iron core unit is attracted to the stationary iron core unit by the electromagnetic attraction force.

[0042] Step S300: Update the preset electromagnetic system model according to the release voltage and total reaction force, so that the electromagnetic characteristics of the updated electromagnetic system model are consistent with those of the contactor, wherein the electromagnetic system model corresponds to the contactor.

[0043] Step S400: Input the preset operating condition parameters into the updated electromagnetic system model to determine the electromagnetic attraction curve. The operating condition parameters are used to characterize the electrical parameters of the coil unit, and the electromagnetic attraction curve is used to characterize the mapping relationship between the magnitude of the electromagnetic attraction and the position of the moving iron core unit.

[0044] By calculating the release voltage and total reaction force, and updating the preset electromagnetic system model based on these parameters, the electromagnetic characteristics of the updated electromagnetic system model can be made consistent with the actual electromagnetic characteristics of the contactor, thereby improving the accuracy of the electromagnetic attraction curve calculation. Furthermore, by inputting the operating condition parameters used to characterize the coil unit electrical parameters into the updated electromagnetic system model, the electromagnetic attraction curve under these operating condition parameters can be determined, thus enabling efficient calculation of the electromagnetic attraction curve and ensuring that the electromagnetic attraction curve accurately reflects the relationship between the attraction and reaction force characteristics of the AC contactor and the positions of the moving and stationary iron cores.

[0045] In one embodiment, the operating parameters include control voltage and control frequency. The control voltage is used to characterize the magnitude of the voltage input to the coil unit, and the control frequency is used to characterize the frequency of the voltage input to the coil unit. The control voltage and control frequency can change over time, thereby improving the measurement efficiency.

[0046] In one embodiment, by changing the operating parameters and inputting multiple different operating parameters into the updated electromagnetic system model, multiple electromagnetic attraction curves corresponding to the multiple different operating parameters are obtained, thereby enabling the rapid acquisition of electromagnetic attraction curves corresponding to different operating parameters, thus improving the calculation efficiency.

[0047] like Figure 3 As shown, Figure 3 yes Figure 2 The detailed flowchart of step S100 is in Figure 3 In the example, step S100 includes, but is not limited to, steps S110, S120 and S130.

[0048] Step S110: Input a preset voltage to the coil unit so that the moving iron core unit and the stationary iron core unit attract each other;

[0049] Step S120: Reduce the voltage input to the coil unit over time and detect the current of the coil unit;

[0050] Step S130: When the change in current of the coil unit within a preset time is greater than a preset threshold, the current voltage of the coil unit is used as the release voltage.

[0051] Specifically, in one embodiment, a preset voltage is input to the coil unit via a programmable power supply, causing the moving iron core unit and the stationary iron core unit to stably engage. The output voltage of the programmable power supply is then adjusted to continuously decrease the input voltage of the coil unit, while an oscilloscope is used to detect the current in the coil unit. Since the permeability of the iron core is much greater than that of air, when the distance between the moving and stationary iron core units changes slightly, the permeability of the working air gap in the magnetic circuit decreases sharply, causing a sudden change in the coil current. That is, the change in the coil unit's current within a preset time exceeds a preset threshold. When the current in the coil unit rises sharply, it indicates that the iron core is vibrating. The voltage of the coil unit at this time is recorded as the release voltage of the coil unit.

[0052] like Figure 4 As shown, Figure 4 yes Figure 2 The detailed flowchart of step S200 is in Figure 4 In the example, step S200 includes, but is not limited to, steps S210, S220, S230 and S240.

[0053] Step S210: Input a preset voltage to the coil unit so that the moving iron core unit and the stationary iron core unit attract each other;

[0054] Step S220: Fix the force gauge so that the pin of the force gauge abuts against the top of the contact bracket;

[0055] Step S230: Zero the force gauge;

[0056] Step S240: Disconnect the power supply to the coil unit and use the current value measured by the force gauge as the magnitude of the total reaction force.

[0057] In one embodiment, when measuring the total reaction force, the contactor is mounted on a horizontally positioned workbench, and the total reaction force is measured using a force gauge. The total reaction force is used to characterize the force that the moving iron core unit experiences in the opposite direction to the electromagnetic attraction force when the moving iron core unit is attracted to the stationary iron core unit by electromagnetic attraction.

[0058] Specifically, the force gauge includes a pin. When measuring the total reaction force, the force gauge is fixed so that when the moving iron core unit and the stationary iron core unit are in the attracted state, the pin of the force gauge abuts against the top of the contact bracket, and the force gauge is set to zero. After the power supply to the coil unit is disconnected, the moving iron core unit and the stationary iron core unit will change from the attracted state to the released state. Since the contact bracket is connected to the moving iron core unit and moves synchronously with the movement of the moving iron core unit, the total reaction force can be transferred to the pin of the force gauge through the contact bracket by abutting the pin of the force gauge against the top of the contact bracket. Therefore, the embodiments of the present invention do not require the use of expensive sensors, data acquisition systems and complex data post-processing programs. It only requires the use of a force gauge to measure the reaction force of the moving iron core unit and an oscilloscope to measure the electrical parameters of the coil unit to complete the necessary data acquisition.

[0059] Furthermore, since the contactor is mounted on a horizontally positioned workbench, and the contact support can only move up and down with the moving iron core unit, the force gauge can accurately measure the total reaction force.

[0060] It is understandable that the relationship between the minimum electromagnetic attraction force and the total reaction force is as follows:

[0061] F M =F R -G

[0062] Where F M For minimum electromagnetic attraction; F R G is the total reaction force when the moving iron core unit and the stationary iron core unit are stably attracted together. The total reaction force can characterize the reaction force corresponding to the electromagnetic attraction force on the entire movable assembly consisting of the moving iron core unit and the components directly or indirectly connected to the moving iron core unit; G is the total weight of the movable assembly.

[0063] Specifically, the contactor also includes a contact unit and a contact spring connected to the contact support, as well as a main reaction spring for providing a reaction force; the total reaction force can characterize the resultant force exerted on the movable assembly by the main reaction spring and the contact spring when the moving iron core unit and the stationary iron core unit are stably engaged, which is the resultant force on the movable assembly of the entire movable assembly consisting of the moving iron core unit, the contact support, the contact unit and the contact spring.

[0064] Specifically, in one embodiment, a preset voltage is input to the coil unit, and the moving iron core unit moves towards the stationary iron core unit under electromagnetic attraction until it is stably attracted to the stationary iron core unit. The position of the force gauge is adjusted so that the force gauge pin is close to the top of the contactor contact bracket. At this time, the force gauge is set to zero, and then the contactor coil voltage is disconnected. The value of the force gauge at this time can be recorded to obtain the pressure of the force gauge on the contactor contact bracket. Since the contact bracket is part of the aforementioned movable component, the minimum electromagnetic attraction of the electromagnetic system when the moving iron core unit and the stationary iron core unit are stably attracted is equal to the pressure of the force gauge on the contact bracket.

[0065] like Figure 5 As shown, Figure 5 yes Figure 2 The detailed flowchart of step S300 is in Figure 5 In the example, step S300 includes, but is not limited to, steps S310 and S320.

[0066] Step S310: Import the preset electromagnetic system model into the finite element analysis software;

[0067] Step S320: Import the release voltage and total reaction force into the finite element analysis software so that the electromagnetic system model can be updated by the finite element analysis software based on the release voltage and total reaction force.

[0068] Specifically, the finite element analysis software can be Maxwell software. The preset electromagnetic system model can be imported into the Maxwell finite element analysis software. The electromagnetic system model can be updated using the minimum electromagnetic attraction force measured in the experiment and the release voltage corresponding to the minimum electromagnetic attraction force. This makes the electromagnetic characteristics of the electromagnetic system model in the finite element analysis software consistent with the electromagnetic characteristics of the contactor, thereby improving the accuracy of the calculated electromagnetic attraction force curve.

[0069] Specifically, by setting the position of the moving iron core unit in the Maxwell software for parametric calculation, data on the change of electromagnetic attraction force with the position of the moving iron core unit can be obtained, and thus the electromagnetic attraction force curve of the contactor can be plotted.

[0070] Specifically, by changing the operating parameters such as voltage, frequency, or number of coil turns in the Maxwell software, the electromagnetic attraction curve corresponding to different operating parameters can be quickly obtained, thus improving the calculation efficiency.

[0071] like Figure 6 As shown, Figure 6 yes Figure 5 The detailed flowchart of step S320 is as follows: Figure 6 In the example, step S320 includes, but is not limited to, steps S321 and S322.

[0072] Step S321: Determine the additional air gap parameters based on the release voltage and total reaction force. The additional air gap parameters are used to characterize the air gap between the pole surfaces of the moving iron core unit and the stationary iron core unit when they are attracted to each other.

[0073] Step S322: Update the electromagnetic system model using finite element analysis software based on the additional air gap parameters.

[0074] The additional air gap parameter is used to characterize the air gap between the contacting poles of the moving and stationary iron core units when they are attracted to each other. By simulating the additional air gap between the moving and stationary iron core units in finite element analysis software, the electromagnetic characteristics of the electromagnetic system model can be more consistent with the electromagnetic characteristics of the contactor, thereby further improving the accuracy of the calculated electromagnetic attraction curve.

[0075] Additionally, refer to Figure 7 , Figure 7 This is a schematic diagram of an electromagnetic attraction force measuring device 200 provided in an embodiment of the present invention. The device includes: a memory 220, a processor 210, and a computer program stored in the memory 220 and executable on the processor 210.

[0076] The processor 210 and the memory 220 can be connected via a bus or other means.

[0077] Memory 220, as a non-transitory computer-readable storage medium, can be used to store non-transitory software programs and non-transitory computer-executable programs. Furthermore, memory 220 may include high-speed random access memory, and may also include non-transitory memory, such as at least one disk storage device, flash memory device, or other non-transitory solid-state storage device. In some embodiments, memory 220 may optionally include remote memory located remotely relative to processor 210, and this remote memory can be connected to processor 210 via a network. Examples of such networks include, but are not limited to, the Internet, intranets, local area networks, mobile communication networks, and combinations thereof.

[0078] The non-transient software program and instructions required to implement the electromagnetic attraction force calculation method of the above embodiments are stored in the memory 220. When executed by the processor 210, the electromagnetic attraction force calculation method in the above embodiments is executed, for example, the method described above is executed. Figures 2 to 6 The methods and steps in the text.

[0079] Furthermore, one embodiment of the present invention provides a computer-readable storage medium storing computer-executable instructions that are executed by a processor or controller, for example, by a processor in the above-described device or apparatus embodiments, causing the processor to perform the electromagnetic attraction force calculation method in the above embodiments, for example, performing the above-described... Figures 2 to 6 The method and steps.

[0080] It will be understood by those skilled in the art that all or some of the steps and systems in the methods disclosed above can be implemented as software, firmware, hardware, and suitable combinations thereof. Some or all of the physical components can be implemented as software executed by a processor, such as a central processing unit, digital signal processor, or microprocessor, or as hardware, or as an integrated circuit, such as an application-specific integrated circuit. Such software can be distributed on a computer-readable medium, which can include computer storage media (or non-transitory media) and communication media (or transient media). As is known to those skilled in the art, the term computer storage media includes volatile and non-volatile, removable and non-removable media implemented in any method or technology for storing information (such as computer-readable instructions, data structures, program modules, or other data). Computer storage media includes, but is not limited to, RAM, ROM, EEPROM, flash memory or other memory technologies, CD-ROM, digital versatile disc (DVD) or other optical disc storage, magnetic cartridges, magnetic tape, disk storage or other magnetic storage devices, or any other medium that can be used to store desired information and is accessible to a computer. Furthermore, as is known to those skilled in the art, communication media typically contain computer-readable instructions, data structures, program modules, or other data in modulated data signals such as carrier waves or other transmission mechanisms, and may include any information delivery medium.

[0081] The above is a detailed description of the preferred embodiments of the present invention. However, the present invention is not limited to the above embodiments. Those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present invention. All such equivalent modifications or substitutions are included within the scope defined by the claims of the present invention.

Claims

1. A method for calculating electromagnetic attraction, applied to a contactor, the contactor comprising a moving iron core unit, a stationary iron core unit and a coil unit, the coil unit being arranged between the moving iron core unit and the stationary iron core unit, the coil unit being configured to generate an electromagnetic attraction to attract the moving iron core unit and the stationary iron core unit, the method comprising: inputting a preset voltage to the coil unit to attract the moving iron core unit and the stationary iron core unit; reducing the voltage input to the coil unit over time and detecting a current of the coil unit; when a change value of the current of the coil unit within a preset time is greater than a preset threshold value, taking a current voltage of the coil unit as a release voltage, the release voltage being used to represent the voltage of the coil unit when the moving iron core unit changes from an attraction state to a release state with the stationary iron core unit; obtaining a total counterforce, the total counterforce being used to represent a force opposite to the electromagnetic attraction that the moving iron core unit receives when the moving iron core unit is attracted to the stationary iron core unit by the electromagnetic attraction; importing a preset electromagnetic system model into a finite element analysis software; importing the release voltage and the total counterforce into the finite element analysis software to update the electromagnetic system model according to the release voltage and the total counterforce by the finite element analysis software, so that electromagnetic characteristics of the updated electromagnetic system model are consistent with the contactor, wherein the electromagnetic system model corresponds to the contactor; inputting preset working condition parameters into the updated electromagnetic system model to determine an electromagnetic attraction curve, wherein the working condition parameters are used to represent electrical parameters of the coil unit, and the electromagnetic attraction curve is used to represent a mapping relationship between the electromagnetic attraction and a position of the moving iron core unit. The contactor further comprises a contact support connected with the moving iron core unit and moving synchronously with the moving iron core unit; the contactor is installed on a horizontally arranged workbench, and the total counterforce is measured by a dynamometer. The obtaining of the total counterforce comprises: inputting a preset voltage to the coil unit to attract the moving iron core unit and the stationary iron core unit; fixing the dynamometer to make a top needle of the dynamometer abut against a top of the contact support; zeroing the dynamometer; disconnecting a power supply of the coil unit, and taking a current measured value of the dynamometer as a size of the total counterforce. The updating of the electromagnetic system model by the finite element analysis software according to the release voltage and the total counterforce comprises: determining an additional air gap parameter according to the release voltage and the total counterforce, the additional air gap parameter being used to represent an air gap between polar surfaces of the moving iron core unit and the stationary iron core unit when the moving iron core unit and the stationary iron core unit are attracted to each other; and updating the electromagnetic system model according to the additional air gap parameter by the finite element analysis software. ​ ​ ​ ​ 2. The electromagnetic force measurement method according to claim 1, wherein ​ 3. The method of claim 2, wherein, ​ ​ ​ ​ ​ 4. The method of claim 1, wherein, ​ ​ ​ 5. The method of claim 1, wherein, The working condition parameters include a control voltage and a control frequency, the control voltage is used to represent a voltage size input to the coil unit, and the control frequency is used to represent a voltage frequency input to the coil unit, wherein the control voltage and the control frequency change with time.

6. The method of claim 1, wherein, By changing the working condition parameters and inputting a plurality of different working condition parameters into the updated electromagnetic system model, a plurality of electromagnetic suction curves corresponding to a plurality of different working condition parameters are obtained.

7. Electromagnetic force measuring device, characterized in that The computer readable storage medium stores computer executable instructions for causing a computer to execute the electromagnetic suction calculation method according to any one of claims 1 to 6.

8. A computer readable storage medium, characterized in that, The computer readable storage medium stores computer executable instructions for causing a computer to execute the electromagnetic suction calculation method according to any one of claims 1 to 6.

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