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Electromagnetic force control method of magnetic disc type negative stiffness electromagnetic actuator

A technology of actuator and control method, applied in mechanical equipment, vibration suppression adjustment, non-rotation vibration suppression, etc., can solve the problems of complex control system and strategy, multi-stability, vibration isolator jumping, etc.

Active Publication Date: 2021-04-02
HARBIN ENG UNIV
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

At present, the structures used to achieve negative stiffness are mainly divided into: mechanical spring type, magnet type, rubber type and electromagnet type. The force of the negative stiffness structure shows obvious nonlinear changes with displacement near the working point. The nature of the system makes it possible that there may be multiple attractors in the quasi-zero stiffness system, causing multi-stable phenomena, resulting in complex dynamic behaviors such as jumping of the vibration isolator as a whole during operation. Sub-migration to achieve vibration reduction and noise reduction, the control system and strategy will be quite complex

Method used

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  • Electromagnetic force control method of magnetic disc type negative stiffness electromagnetic actuator
  • Electromagnetic force control method of magnetic disc type negative stiffness electromagnetic actuator
  • Electromagnetic force control method of magnetic disc type negative stiffness electromagnetic actuator

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specific Embodiment 1

[0109] according to Figure 1 to Figure 7 As shown, the present invention provides a method for controlling electromagnetic force of a disk-type negative stiffness electromagnetic actuator, a method for controlling electromagnetic force of a disk-type negative stiffness electromagnetic actuator, comprising the following steps:

[0110] Step 1: According to the static bearing capacity, select the mechanical spring that provides the positive stiffness of the vibration isolation system, and determine the positive stiffness of the spring;

[0111] Step 2: Establish the electromagnetic force model under magnetic unsaturation, and determine the electromagnetic attraction force of the electromagnet;

[0112] The step 2 is specifically:

[0113] Establish the electromagnetic force model under magnetic unsaturation, determine the electromagnetic attraction force of the electromagnet, and express the electromagnetic attraction force of the electromagnet by the following formula:

[01...

specific Embodiment 2

[0200] An electromagnetic force control method of a disk type negative stiffness electromagnetic actuator, comprising the following steps:

[0201] S1. According to the actual required static bearing capacity, reasonably select the mechanical spring that provides the positive stiffness of the vibration isolation system, and determine its positive stiffness as k.

[0202] S2. Establish as image 3 The single electromagnet magnetic circuit model shown, establishes the electromagnetic force mathematical model under the condition of magnetic unsaturation, as shown in the formulas (1-1) to (1-13).

[0203]

[0204]

[0205]

[0206]

[0207]

[0208]

[0209]

[0210]

[0211]

[0212]

[0213]

[0214] R total1 =R gap11 +R gap21 +R arm +R iron (1-12)

[0215]

[0216] In the formula: F mag1 is the electromagnetic attraction force of electromagnet 1, Φ 1 is the magnetic flux of electromagnet 1, μ 0 is the vacuum permittivity, μ 1 is the...

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Abstract

The invention relates to an electromagnetic force control method of a magnetic disc type negative stiffness electromagnetic actuator. The invention relates to the technical field of vibration control,and the method comprises the steps of determining the positive stiffness k of a mechanical spring needed by a magnetic disc type quasi-zero stiffness vibration isolator according to the actually needed static bearing capacity, and establishing a mathematical model of the electromagnetic force of a single electromagnet under the condition of magnetic unsaturation. Aiming at the magnetic disc typequasi-zero stiffness vibration isolator, coil current serves as input control quantity, so that electromagnetic force and displacement of the negative stiffness electromagnetic actuating mechanism arein linear relation, the nonlinear nature of a vibration isolation system is changed, the multistable phenomenon caused by the nonlinear electromagnetic force during working is avoided, complex dynamic behaviors such as jumping of the whole vibration isolator during working are eliminated, complex sensors and control systems are not needed, and the implementation mode is simple and convenient.

Description

technical field [0001] The invention relates to the technical field of vibration control, and relates to an electromagnetic force control method of a disk type negative stiffness electromagnetic actuator. Background technique [0002] As an important technical means of vibration reduction and noise reduction, vibration isolation technology aims to take certain measures between the vibration source and the system, and install appropriate vibration suppression or vibration isolation equipment to isolate the direct transmission of vibration. Traditional passive vibration isolators can theoretically only be used for excitation frequencies greater than Therefore, in the field of low-frequency vibration isolation, quasi-zero stiffness vibration isolation technology has received more and more attention in recent years. [0003] Quasi-zero stiffness vibration isolators are mostly composed of positive and negative stiffness structures connected in parallel, which can reduce the ove...

Claims

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Application Information

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IPC IPC(8): G06F30/17G06F30/20
CPCG06F30/17G06F30/20F16F15/002F16F15/03F16F2222/06F16F2228/001F16F2228/063F16F2230/18
Inventor 靳国永袁俊杰叶天贵刘志刚
Owner HARBIN ENG UNIV
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