An Electromagnetic Spring with Linear Negative Stiffness Characteristics

Abstract

The invention aims at providing an electromagnetic spring with a linear negative stiffness characteristic. The electromagnetic spring comprises a stator and a rotor. The stator is arranged outside the rotor. A coil is wound around the rotor. Rectangular gear rings are arranged on the working surface of the rotor and the working surface of the stator. The position of the rectangular gear ring of the rotor corresponds to that of the rectangular gear ring of the stator, and an air gap exists between the rectangular gear ring of the rotor and the rectangular gear ring of the stator. The pitch of the rectangular gear ring of the stator is larger than the tooth width of the rectangular gear ring of the rotor. When the coil is not powered on, the position of each tooth groove of the rectangular gear ring of the stator corresponds to that of a magnetic tooth of the rectangular gear ring of the rotor. By means of the electromagnetic spring, due to the fact that the tooth grooves of the stator correspond to the magnetic teeth of the rotor, and the optimal specific value of the widths of the tooth grooves of the stator and the magnetic teeth of the rotor is determined, the electromagnetic spring only has the linear negative stiffness characteristic in the working stroke and the nonlinear stiffness characteristic of the electromagnetic spring disappears; and the circumstance that the electromagnetic spring only has the linear negative stiffness characteristic in the working stroke and the nonlinear stiffness characteristic of the electromagnetic spring disappears cannot be achieved by an existing negative stiffness structure.

Description

technical field [0001] The invention relates to a vibration control device, specifically an electromagnetic spring. Background technique [0002] Quasi-zero stiffness vibration isolators have been more and more studied in recent years because of their excellent high static stiffness and low dynamic stiffness characteristics. As the core component of quasi-zero stiffness vibration isolators, the quality of the negative stiffness structure directly affects all Design the vibration isolation performance of the vibration isolator. [0003] So far, researchers have been able to achieve negative stiffness through a variety of ways, typical methods are: mechanical spring, magnet, rubber and electromagnet. ([1] R.A.Ibrahim. "Recent advances in nonlinearpassive vibration isolators." J.Sound Vib, 2008) However, there is a problem that must be faced with the negative stiffness characteristics achieved by all these schemes: the emergence of nonlinear stiffness characteristics. [0004...

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Problems solved by technology

([1] R.A.Ibrahim. "Recent advances in nonlinearpassive vibration isolators." J.Sound Vib, 2008) However, there is a problem that must be faced with the negative stiffness characteristics achieved by all these schemes: the emergence of nonlinear stiffness characteristics

Compared with the existing quasi-zero stiffness vibration isolators, this patent has the advantages of large load capacity, small volume, light weight, etc., but it will also introduce nonlinearity while achieving negative stiffness, which will lead to the design of vibration isolation When the device is actually working, it will produce jumping phenomenon or even more complex dynamic behavior.

[0005] To sum up, the existence of nonlinearity will not only have a great impact on the dynamic characteristics of the system, but it is also very difficult to control in the field of active control

For this reason, it is necessary to design a mechanism with only linear negative stiffness characteristics. However, after consulting domestic and foreign literature, no relevant research work has been found.

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