High-thrust piezoelectric linear actuator with self-locking function and driving method thereof

Abstract

The invention belongs to the technical field of piezoelectric actuators, and particularly relates to a high-thrust piezoelectric linear actuator with a self-locking function and a driving method thereof. According to the driving method of the high-thrust piezoelectric linear actuator with the self-locking function, pre-tightening of the piezoelectric ceramic actuator is adjusted through the pre-tightening bolt on the piezoelectric ceramic actuator; alternate driving of the two pairs of piezoelectric ceramics is achieved through voltage driving of asymmetric triangular waves, rotation of the threaded push rod is converted into front-back movement through the guiding effect of the threaded push rod, and meanwhile the threaded push rod with threads achieves the self-locking function through the T-shaped end. The beneficial effects are that the structure is simple, the four piezoelectric ceramic drivers effectively improve the driving force, the alternate driving of the two pairs of piezoelectric ceramic drivers can improve the movement speed, the threaded push rod adopts the roller screw, the guide effect can significantly reduce the friction force, improve the response resolution andimprove the response speed, and the threaded push rod has a self-locking function.

Description

technical field [0001] The invention belongs to the technical field of piezoelectric actuators, and in particular relates to a piezoelectric linear actuator with a large thrust and self-locking function and a driving method thereof. Background technique [0002] Piezoelectric actuators mainly include: (1) Signal-controlled inertial piezoelectric actuators, whose driving principle is to use asymmetrical drive signals as the power source and match the symmetrical friction force in the forward and backward directions to drive, but A complex and precise signal control system is required in the resume, which brings certain difficulties to the miniaturization and integration of the whole actuator; (2) friction control inertial piezoelectric precision actuator, its driving principle is to use symmetrical drive The driving force generated by the joint action of the signal and the mechanical clamping structure is used as the power source, and the driving is realized through the asymm...

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Problems solved by technology

[0002] Piezoelectric actuators mainly include: (1) Signal-controlled inertial piezoelectric actuators, whose driving principle is to use asymmetrical drive signals as the power source and match the symmetrical friction force in the forward and backward directions to drive, but A complex and precise signal control system is required in the resume, which brings certain difficulties to the miniaturization and integration of the whole actuator; (2) friction control inertial piezoelectric precision actuator, its driving principle is to use symmetrical drive The driving force generated by the joint action of the signal and the mechanical clamping structure is used as the power source, and the driving is realized through the asymmetric friction force in the forward and backward directions, but the friction force is nonlinear, due to the condition of the contact surface, aging, temperature, wear and Processing and assembly errors will affect the actuator, resulting in poor motion stability, low resolution, and small load capacity of the actuator

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