Voice coil-piezoelectric hybrid large displacement actuator

Abstract

The invention relates to a voice coil-piezoelectric hybrid large displacement actuator. The voice coil-piezoelectric hybrid large displacement actuator is composed of a magnetizer, an annular permanent magnet, a hollow iron core, a pull rod, a coil, a locking end, a cover plate, a piezoelectric amplifying mechanism, a limiting block and a screw. A process of realizing large displacement actuation is as follows: a uniform air-gap magnetic field is produced between the magnetizer and the annular permanent magnet inlaid in the magnetizer, the coil is arranged in the magnetic field, one end of the coil is connected with the pull rod, the pull rod sheathes inside the hollow iron core, the hollow iron core clings the annular permanent magnet and is connected with the bottom of the magnetizer in a communicating manner; the magnetizer is fixed at the locking end; the piezoelectric amplifying mechanism is composed of a piezoelectric stack and a tertiary displacement amplifying mechanism and sheathes the fine end of the pull rod, and a third rhombohedral ring short axis tooth socket of the tertiary displacement amplifying mechanism is meshed and locked with a tooth socket in the inner wall of the locking end; the piezoelectric stack is electrified, the third rhombohedral ring short axis is shortened, and locking is relieved; then quantitative and directional current is applied to the coil, ampere force is produced, and the pull rod is pulled; and if the piezoelectric stack is cut off from electricity, locking is realized again, and large displacement and force output of position locking are realized.

Description

technical field [0001] The invention relates to the technical field of actuators, in particular to a voice coil-piezoelectric hybrid large displacement actuator. Background technique [0002] It is known from physics that the current-carrying wire will be affected by the Ampere force in the magnetic field. The voice coil actuator uses this phenomenon to directly convert electrical energy into mechanical energy and output displacement and force. Voice coil actuators have excellent performances such as small size, light weight, high acceleration, fast response and uniform force, and are widely used in vibration control, instrument positioning and other fields. [0003] Applying an alternating electric field on a piezoelectric material crystal can cause mechanical deformation of the crystal. Piezoelectric actuators have the advantages of high resolution, large output force, fast response, low power consumption, and light structure. Therefore, various actuators based on piezoel...

AI Technical Summary

Problems solved by technology

[0004] However, since the voice coil motor is prone to heat after long-term work, the position locking structure is complicated; the piezoelectric stack outputs a small displacement, and is generally output through a lever structure or cascaded multiple actuators.

However, when large displacement output is required, and functions such as power-off lock, heat dissipation, and lightness are required, traditional voice coils or piezoelectric actuators are difficult to meet all the above conditions.

Images