Ultrasonic motor with convenient rotor axial preload adjustment

Abstract

The invention relates to a rotor axial pre-tightening force conveniently adjustable ultrasonic motor. The ultrasonic motor comprises a shell (2), a base (6), a rotation shaft (3) and a rotor (1), wherein the shell (2) and the base (6) are connected together so as to form an installation space for installing the rotor (1) and a piezoelectric ceramic piece. The rotor axial pre-tightening force conveniently adjustable ultrasonic motor is characterized in that: a special-shaped center hole for installing the rotation shaft (3) is formed in the rotor (1); one section of the rotation shaft (3), which is inserted into the rotor (1), is shaped to match the special-shaped center hole, so that the rotor (1) can drive the rotation shaft (3) to rotate, and at the same time, the rotor (1) can move along the axial direction of the rotation shaft (3); one end of the rotation shaft (3), located in the shell (2), is supported in a first bearing (8); the first bearing (8) is sheathed in a first bearing installation hole of the shell (2); a gasket (5) sleeves the rotation shaft (3) between the rotor (1) and the first bearing (8); and a spinning nut (4) is screwed on the shell (2), wherein the spinning nut (4) can assist in adjusting the position of the first bearing (8) so that the first bearing (8) can move along the axial direction of the rotation shaft (3), and therefore, the pre-tightening force of the rotor can be adjusted. The rotor axial pre-tightening force conveniently adjustable ultrasonic motor has the advantages of structural simplicity and convenience in axial pre-tightening force adjustment.

Description

technical field [0001] The invention relates to an ultrasonic motor, in particular to a structure of an ultrasonic motor, in particular to an ultrasonic motor with convenient adjustment of the rotor axial pretightening force. Background technique [0002] Ultrasonic motor breaks through the concept of traditional motor. It has no magnetic steel and windings, and does not rely on electromagnetic induction to transmit energy. It uses the inverse piezoelectric effect of piezoelectric ceramics, through the conversion and coupling of piezoelectric ceramic stretching vibration modes and special structures. The design converts the microscopic deformation of the material into the macroscopic motion of the rotor through resonance amplification and friction coupling. The ultrasonic motor is driven by the friction between the rotor and the stator. The axial preload of the rotor is the positive pressure between the rotor and the stator, and its size has a great influence on the performa...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to design an ultrasonic motor with convenient adjustment of the axial preload of the rotor for the problem of inconvenient adjustment of the rotor preload of the existing ultrasonic motor

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