Magnetic suspension type quasi-zero stiffness electromagnetic vibration isolator with active negative stiffness

Patent metadata

Field	Value
Publication number	US-11624419-B2
Application number	US-202117237106-A
Country	US
Kind code	B2
Filing date	Apr 22, 2021
Priority date	Dec 28, 2020
Publication date	Apr 11, 2023
Grant date	Apr 11, 2023

Abstract

The disclosure provides a magnetic suspension type quasi-zero stiffness electromagnetic vibration isolator with active negative stiffness. The disclosure relates to the technical field of vibration control. The disclosure can selectively realize passive negative stiffness and active negative stiffness by adjusting the control mode of a controller. By adopting an amplifying mechanism and DIESOLE type electromagnets, the bearing capacity of the vibration isolator is further increased, and the disclosure is suitable for the field of ultra-low frequency heavy load vibration reduction and isolation. The displacement state of a negative stiffness mechanism can be measured in real time according to a sensor, and by means of cooperation of the controller and a driver, active negative stiffness is realized, real-time linear negative stiffness is realized, the multi-stable phenomenon is avoided, and complex dynamic phenomena such as jumping during working of the vibration isolator are prevented. The active negative stiffness is realized, the current passing through the system can be adjusted according to different working conditions, and the system has strong self-adaptive ability, can be applied to vibration-isolated objects of different quality, and can adapt to different working environments.

First claim

What is claimed is:

1. A magnetic suspension type quasi-zero stiffness electromagnetic vibration isolator with active negative stiffness, comprising an actuator and an electric control part,
wherein the actuator comprises a bottom plate, a rotor assembly, a stator assembly, a spring assembly and a support plate; the bottom plate supports the rotor assembly and the stator assembly; and the spring assembly connects the support plate and the stator assembly;
the electric control part comprises a displacement sensor, a controller, a driver and a DC stabilized power supply; the displacement sensor is installed between the support plate and the bottom plate; and the DC stabilized power supply supplies power to the displacement sensor, the controller and the driver respectively;
wherein the rotor assembly comprises a left armature lower connecting rod base, a left armature lower connecting rod, a left armature upper connecting rod seat, a left armature, a left armature lower connecting rod seat, a left armature upper connecting rod, a left armature upper connecting rod footstock, a right armature upper connecting rod footstock, a right armature upper connecting rod, a right armature upper connecting rod seat, a right armature, a right armature lower connecting rod seat, a right armature lower connecting rod and a right armature lower connecting rod base;
the left armature upper connecting rod footstock is installed on a left side under the support plate; the left armature lower connecting rod base is installed on a left side above the bottom plate; the left armature upper connecting rod seat and the left armature lower connecting rod seat are installed at middle parts of upper and lower ends of the left armature, respectively; one ends of the left armature upper connecting rod and the left armature lower connecting rod are connected with the left armature upper connecting rod seat and the left armature lower connecting rod seat, respectively; the other ends of the left armature upper connecting rod and the left armature lower connecting rod are connected with the left armature upper connecting rod footstock and the left armature lower connecting rod base, respectively; the right armature upper connecting rod footstock is installed on a right side under the support plate; the right armature lower connecting rod base is installed on a right side above the bottom plate; the right armature upper connecting rod seat and the right armature lower connecting rod seat are installed at middle parts of upper and lower ends of the right armature, respectively; one ends of the right armature upper connecting rod and the right armature lower connecting rod are connected with the right armature upper connecting rod seat and the right armature lower connecting rod seat, respectively; and the other ends of the right armature upper connecting rod and the right armature lower connecting rod are connected with the right armature upper connecting rod footstock and the right armature lower connecting rod base, respectively.

2. The magnetic suspension type quasi-zero stiffness electromagnetic vibration isolator according to claim 1 , wherein the stator assembly comprises a left electromagnet assembly, a middle electromagnet assembly, a right electromagnet assembly, a front connecting plate and a rear connecting plate; and
the left electromagnet assembly, the middle electromagnet assembly and the right electromagnet assembly are each installed between the base and the support plate; the left electromagnet assembly and the right electromagnet assembly are symmetrical about the middle electromagnet assembly; and the front connecting plate and the rear connecting plate are installed to connect the front and rear sides of the left electromagnet assembly and the right electromagnet assembly together, respectively.

3. The magnetic suspension type quasi-zero stiffness electromagnetic vibration isolator according to claim 2 , wherein the left electromagnet assembly comprises a left electromagnet fixing seat, a left shaft fixing sleeve, a left guide shaft, two left electromagnet support springs, a left linear bearing, a left electromagnet adjusting seat, a left front lever support seat, a left front short lever support, a left front long lever support, a left front short lever, a left front long lever, a left front lever connecting seat, a left front straight rod, a left front straight rod footstock, a left DIESOLE type electromagnet, a left rear straight rod footstock, a left rear straight rod, a left rear long lever, a left rear short lever, a left rear lever connecting seat, a left rear short lever support, a left rear long lever support and a left rear lever support seat; and the left DIESOLE type electromagnet comprises a left electromagnet core, a left electromagnet outer coil, a left electromagnet inner coil and a left magnetorheological elastomer;
the left electromagnet fixing seat is installed on the base; the left shaft fixing sleeve is installed on the left electromagnet fixing seat; the left guide shaft is installed in the left shaft fixing sleeve; the left electromagnet adjusting seat is installed under the left DIESOLE type electromagnet; the left linear bearing is installed on the left electromagnet adjusting seat and is matched with the left guide shaft; and the two left electromagnet support springs are installed between the left electromagnet fixing seat and the left electromagnet adjusting seat and are symmetrical about the left guide shaft; and
the left front straight rod footstock and the left rear straight rod footstock are installed at the front and rear of the left side under the support plate, respectively; one ends of the left front straight rod and the left rear straight rod are connected with the left front straight rod footstock and the left rear straight rod footstock, respectively; the other ends of the left front straight rod and the left rear straight rod are connected with one ends of the left front short lever and the left rear short lever, respectively; the other ends of the left front short lever and the left rear short lever are connected with one ends of the left front long lever and the left rear long lever, respectively; the other ends of the left front long lever and the left rear long lever are connected with the left front lever connecting seat and the left rear lever connecting seat, respectively; the left front lever connecting seat and the left rear lever connecting seat are fixedly installed on front and rear sides of the left DIESOLE type electromagnet, respectively; the left front short lever support, the left front long lever support, the left rear short lever support and the left rear long lever support are installed in corresponding positions of the left front short lever, the left front long lever, the left rear short lever and the left rear long lever; and the left front lever support seat and the left rear lever support seat are installed under the left front short lever support and the left front long lever support, and the left rear short lever support and the left rear long lever support, respectively, to play a support role.

4. The magnetic suspension type quasi-zero stiffness electromagnetic vibration isolator according to claim 3 , wherein the middle electromagnet assembly comprises a middle shaft fixing sleeve, a middle guide shaft, a middle linear bearing, a middle front lever support seat, a middle front long lever support, a middle front short lever support, a middle front long lever, a middle front short lever, a middle front lever connecting seat, a middle front straight rod, a middle front straight rod footstock, a magnetic isolation block, a middle left DIESOLE type electromagnet, a middle rear lever support seat, a middle rear long lever support, a middle rear short lever support, a middle rear long lever, a middle rear short

Assignees

• Univ Harbin Eng

Inventors

• Jin Guoyong
• Yuan Junjie
• Ye Tiangui
• Liu Zhigang

Classifications

• H01F2007/1692

  Electromagnets or actuators with two coils · CPC title

• F16F15/03 Primary

  using {magnetic or} electromagnetic means (F16F9/53, {F16F15/005} take precedence) · CPC title

• F16F15/022

  using dampers and springs in combination · CPC title

• H01F7/1638

  Armatures not entering the winding · CPC title

• F16F2222/06

  Magnetic or electromagnetic · CPC title