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Method for indirectly measuring flux linkage and attraction characteristics of electromagnetic switch operating mechanism

A technology of electromagnetic switches and operating mechanisms, which is applied in the fields of magnetic performance measurement, force/torque/power measuring instruments, measuring devices, etc., which can solve the complex modeling process, the difficulty of accurate and direct measurement of the electromagnetic characteristics of electromagnetic switches, and the influence of finite element simulation issues of accuracy

Active Publication Date: 2020-12-11
FUZHOU UNIV
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Problems solved by technology

[0004] At present, it is difficult to accurately and directly measure the electromagnetic characteristics of electromagnetic switches
The static electromagnetic characteristics of the electromagnetic switch are mainly obtained by finite element simulation, but the finite element modeling process is relatively complicated, requiring geometric parameters of the electromagnetic switch body, material characteristic parameters, etc., and these parameters are sometimes difficult to obtain accurately
On the other hand, in order to improve the calculation speed of the finite element, it is usually necessary to perform appropriate simplification in the modeling process, adjust the grid subdivision accuracy, etc., which will affect the accuracy of the finite element simulation, and different electromagnetic switches require Only by repeating this complex modeling and simulation process can the static electromagnetic characteristics be obtained, which requires a lot of work

Method used

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  • Method for indirectly measuring flux linkage and attraction characteristics of electromagnetic switch operating mechanism
  • Method for indirectly measuring flux linkage and attraction characteristics of electromagnetic switch operating mechanism
  • Method for indirectly measuring flux linkage and attraction characteristics of electromagnetic switch operating mechanism

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Embodiment Construction

[0043] In order to make the features and advantages of this patent more obvious and easy to understand, the following special examples are described in detail as follows:

[0044] Such as figure 1 Shown is a typical double E-shaped direct-acting operating mechanism of an electromagnetic switch, which is mainly composed of a moving iron core, a static iron core, an air gap between the moving and static iron cores, a coil and a spring.

[0045] The electromagnetic mechanism satisfies the following dynamic differential equations during the motion process:

[0046]

[0047]

[0048]

[0049] In the formula: u coil is the coil voltage, i coil is the coil current, R coil is the coil resistance, ψ is the flux linkage of the electromagnetic system, F x is the electromagnetic attraction force, F f is the spring reaction force, m is the equivalent mass of the movable part, v is the velocity of the moving iron core, and x is the displacement of the moving iron core. Formul...

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Abstract

The invention provides a method for indirectly measuring flux linkage and attraction characteristics of an electromagnetic switch operating mechanism. The method comprises the following steps of: S1,indirectly measuring static flux linkage characteristics of an electromagnetic switch by adopting a movable iron core locking method and current closed-loop control; S2, solving magnetic common energyby utilizing the measured static flux linkage characteristic data; and S3, obtaining the static attraction force of the electromagnetic switch by utilizing the magnetic common energy data. Data obtained through the method can reflect the nonlinear strong coupling relation among the coil current, magnetic circuit flux linkage, iron core displacement and electromagnetic attraction force of the electromagnetic switch in detail and visually, the complex electromechanical coupling relation can be further fitted through an interpolation table, a polynomial or a neural network, off-line or on-line calculation of electromagnetic characteristics is achieved, and a foundation is laid for dynamic characteristic simulation and high-performance control of the electromagnetic switch.

Description

technical field [0001] The invention belongs to the field of electromagnetic switches, in particular to an indirect measurement method for magnetic linkage and suction characteristics of an electromagnetic switch operating mechanism. Background technique [0002] The electromagnetic switch is a basic component of the power system, with a large quantity and a wide range. The common feature of this type of electrical appliance is that it includes an electromagnetic system and a contact system in structure, and controls the on-off of the contact system according to the electromagnetic force generated by the electromagnetic system, such as : Electromagnetic relays, electromagnetic contactors, electromagnetic circuit breakers, etc.; emerging permanent magnet relays, permanent magnet contactors, permanent magnet circuit breakers and other permanent magnet switches also need the cooperation of electromagnetic force to realize the contact system in the process of pulling in and break...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R33/12G01L5/00G06F17/13
CPCG01L5/00G01R33/1253G06F17/13
Inventor 汤龙飞陈炜庄剑雄
Owner FUZHOU UNIV
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