S-shaped multi-pin clamped piezoelectric motor and operating mode thereof

Abstract

The invention discloses an S-shaped multi-pin clamped piezoelectric motor and an operating mode thereof and belongs to the technical field of piezoelectric precision actuation. The motor consists of a stator assembly (1), a rotor assembly (2), a motion output assembly (3) and a base (4), wherein a core element of the stator assembly has an S-shaped structure formed by connecting three displacement transformation frames end to end and combining the three displacement transformation frames in a laminated way; in the three displacement transformation frames, a laminated piezoelectric stack serves as an actuated element, and each frame can output displacement in two spatially orthogonal directions; and a middle displacement transformation frame has the function of clamping and driving simultaneously during operation, and the other two displacement transformation frames only serve as clamping units. The motor can operate in two modes, namely a direct drive mode and a stepping mode, whereindeformation of the laminated piezoelectric stack can be directly controlled in the direct drive mode so as to realize accurate positioning; and quick positioning can be realized in the stepping mode.In addition, the motor has a compact and simple structure and a simple process, and is self-locked during power failure.

Description

technical field [0001] The invention relates to an S-shaped multi-legged clamping piezoelectric motor and its working mode, belonging to the technical field of piezoelectric precision actuation. Background technique [0002] With the development of micro / nano technology, research in many engineering and technical fields urgently needs submicron and micro / nano precision actuators. The electromagnetic motor based on the principle of electromagnetic induction is difficult to break through the limitations of the principle in the direction of miniaturization and high power-to-weight ratio. With the development of material science, new functional materials have proposed new solutions for these applications. Among them, the discovery of the inverse piezoelectric effect and the emergence of piezoelectric ceramic (PZT) materials with superior performance have made piezoelectric precision actuators The research has received extensive attention and has shown broad application prospect...

AI Technical Summary

Problems solved by technology

[0012] First, the key to the stepping of the inchworm-type clamping piezoelectric motor is that the two clamping units can alternately lock the parallel guide rails, and the two clamping units are separated by a certain distance in the direction of motion, which requires parallel guide rails The parallelism must be high enough. Under the existing technical conditions, it is very difficult to realize the high parallelism of the two guide rails with a long distance, which requires high production cost;

[0013] Second, the parallel guide rails of the inchworm-type clamping stepping piezoelectric motor are fixed, and the wear at both ends of the clamping unit will eventually lead to the inability to achieve clamping, resulting in failure;

[0014] Third, the laminated piezoelectric stack can only withstand a small pulling force, but can withstand a large thrust. Therefore, when the drive unit is shortened, the working capacity of the laminated piezoelectric stack is very small, which reduces the movement of the mover. s efficiency

[0015] Fourth, when all the laminated piezoelectric stacks are powered off, the locking force between the clamping unit and the parallel guide rails is much smaller than that of the clamping unit locking the parallel guide rails, so the inchworm-type clamping step Piezoelectric motors have almost no power-off self-locking ability

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