Bistable state actuator

Abstract

The invention provides a bistable state actuator which comprises a support, a prestretching mechanism, an actuating mechanism and a driving mechanism. The prestretching mechanism is provided with stretching arms which are distributed on the two sides of the support. The driving mechanism comprises two intelligent soft material thin films, the inner ends of the two thin films are attached to a rigid piece respectively, the outer ends of the two thin films are fixedly connected to clamps which are connected with the stretching arms respectively, and the actuating mechanism is driven through contracting and stretching of the intelligent soft material thin films. The actuating mechanism comprises a bistable state beam and the rigid piece, and the bistable state beam is placed at the center of the actuating mechanism and vertically penetrates through the middle of the rigid piece. The intelligent soft material thin films are attached to the rigid piece, and the two ends of the bistable state beam are connected with the support. The actuator is switched between two stable states through position state switching of the bistable state beam, the bistable state beam only provides energy when the position states are switched, and it is kept that energy is of no need in the stable position states. The bistable state actuator achieves bistable state driving by the aid of intelligent sift material thin film materials and the bistable state structure, and not only is the advantage of a common actuator achieved, but also the advantages of miniaturization, power saving and quick response are achieved.

Description

technical field [0001] The present invention relates to actuators, in particular to a bistable actuator driven by intrinsic strain of intelligent soft materials. Background technique [0002] Micro-actuators are important components of electromechanical bistable drives, among which micro-actuators based on the driving principles of electricity, heat, magnetism and light are the focus of research. The voltage required by the traditional electromagnetic driver can be very low, but the size effect of its working characteristics is obvious, the structure is complex, the power consumption is high, and the efficiency is not high. Although the bi-stable design can alleviate the difficulty of heat dissipation caused by seeding heat, this device still has the problem of low power efficiency. Thermomechanical (electrothermal) drives can have lower drive voltages, higher output torques, and higher energy per unit volume in small sizes. However, thermomechanical drives have the disadv...

AI Technical Summary

Problems solved by technology

However, the thermomechanical drive has the disadvantages of high power consumption and slow response

The permanent magnet bistable electrothermal drive introduces a bistable structure on the basis of the traditional thermomechanical drive to improve the defects of thermal drive, but it still has the disadvantages of complex structure and low efficiency.

In addition, traditional smart soft material drivers need to maintain the excitation to maintain the driving state, which results in low energy utilization and no energy-saving effect

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