Rotary ultrasonic motor and its implementation method

Abstract

The invention discloses a rotary ultrasonic motor, which comprises a screw, a hold-down mechanism, a bearing, a rotor, a stator and a piezoelectric element. The screw is provided with the piezoelectric element, the stator, the rotor, the bearing and the hold-down mechanism in turn. The piezoelectric element, the stator, and the hold-down mechanism are fixed on the screw. One end of the stator adjacent to the rotor is a circular conical surface. One end of the rotor adjacent to the stator is a female conical surface matched with the circular conical surface. The invention also discloses the method to achieve the rotary ultrasonic motor. The motor has the advantages of direct drive, being well controlled, no noise, no magnetic field action and so on, and is in particular applicable for minitype rotary motion devices of small torsion and multi-rotor output.

Description

technical field [0001] The invention relates to the motor technology utilizing the piezoelectric effect, in particular to a rotary ultrasonic motor and its realization method. Background technique [0002] In the existing rotary ultrasonic motors, the cylindrical stator is mainly used, and one end of the rotor matched with the stator is an inner cylindrical surface, and the output is a single rotor, which generally has the defects of complicated processing technology and low driving force. The "miniature rod type traveling wave ultrasonic motor" with the patent number "200410065703.9" relies on the end surface friction contact between the stator and the rotor. The difference in relative speed between them, the degree of wear of the contact area of ​​the inner and outer rings is different, the output torque of the rotor is related to the area of ​​the disc surface or torus in the contact area, and the maximum output torque has not yet been reached; in addition, piezoelectric ...

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Problems solved by technology

[0002]In the existing rotary ultrasonic motors, the cylindrical stator is mainly used, and one end of the rotor matched with the stator is an inner cylindrical surface, and it is a single rotor output. There are common defects of complex processing technology and low driving force

The "miniature rod type traveling wave ultrasonic motor" with the patent number "200410065703.9" relies on the end surface friction contact between the stator and the rotor. The difference in relative speed between them, the degree of wear of the contact area of ​​the inner and outer rings is different, the output torque of the rotor is related to the area of ​​the disc surface or torus in the contact area, and the maximum output torque has not yet been reached; in addition, piezoelectric ceramics adopt Two partitions, in order to produce the combination of mutually perpendicular bending vibrations, it is necessary to ensure that the polarization partition lines of the two sets of piezoelectric ceramic sheets are perpendicular to each other, which causes the assembly process of the motor to be complicated and the cost to increase

The patent No. "200410065700.5" of the "Double Rotor Cylinder Traveling Wave Type Single-Phase Drive Ultrasonic Motor" relies on the contact between the hemispherical rotor and the inner cone of the metal cylinder. The actual contact area is a circular contact line instead of surface contact, which is easy In addition, it is necessary to bond the piezoelectric ceramic sheets perpendicular to each other on the four flat surfaces of the hollow metal elastic body. The bonding and processing techniques are complicated and the cost is high.

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