Experimental study on friction braking deceleration system based on micro displacement mechanism

In this paper, a friction braking deceleration system based on micro displacement mechanism is designed. Taking the laminated piezoelectric ceramic as the driving element, the displacement of piezoelectric multilayer actuator is amplified with the flexible hinge based on the principles of triangle amplification. The motion mechanism of the structure is analyzed, and the stiffness model of unilateral flexible hinges is established. The first order natural frequency of the mechanism reaches 1814Hz by the finite element software simulation. The output characteristics of the prototype are tested. The experimental results show that: the mechanism performs excellent start-up characteristics with high resolution, which can achieve millisecond class fast response (about 5.3ms) and stability quickly. The maximum displacement difference of hysteresis effect is 5μm, and the minimum step displacement is 150nm. In addition, the friction braking deceleration system achieves the expected effect, and the target speed can be precisely controlled by the combined of the ultrasonic motor and the amplifier.