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Liquid medium longitudinal vibration non-contact type ultrasonic motor

An ultrasonic motor, non-contact technology, applied in the direction of generator/motor, piezoelectric effect/electrostrictive or magnetostrictive motor, electrical components, etc. Short life and other problems, to achieve the effect of reasonable and simple structure, large output torque, simple and convenient control

Inactive Publication Date: 2009-08-12
SHENZHEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, there are following problems that are difficult to overcome: (1) due to friction and wear, the working life is short; (2) it cannot run continuously for a long time
The driving mechanism of the ultrasonic motor with this structure is similar to that of the contact ring type ultrasonic motor. It needs to form a driving force after the sound field formed in the liquid medium reaches a certain intensity, while the driving ability generated by the ring-shaped vibrator is weak.

Method used

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  • Liquid medium longitudinal vibration non-contact type ultrasonic motor

Examples

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Embodiment

[0023] Example: from figure 1 It can be clearly seen that the liquid medium longitudinal vibration non-contact ultrasonic motor is composed of a stator 10 and a rotor 1. The stator 10 is composed of a front cover 4 with a coupling fluid cavity 3 inside, and an end cover for coupling the liquid cavity 3 to be closed. 14. The rear cover 7 installed on the front cover 4 by bolts 8, and six ring-shaped piezoelectric ceramics 6 and five ring-shaped electrodes 5 installed on the bolts 8 between the front cover 4 and the rear cover 7, The six ring-shaped piezoelectric ceramics 6 are connected in parallel, and the five ring-shaped electrodes 5 are divided into two groups of excitation signal poles by the ring-shaped piezoelectric ceramics 6 connected in parallel.

[0024] The front cover 4 is a cup-shaped countersunk structure, and the countersunk part of the cup-shaped countersunk structure is provided with a coupling fluid cavity 3 .

[0025] In order to prevent electric leakage, t...

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Abstract

The invention provides a liquid-medium longitudinal-vibration non-contact ultrasonic motor, which comprises a stator and a rotor. The ultrasonic motor is characterized in that the stator consists of a front cover plate provided with a coupling fluid cavity inside, an end cover for sealing the coupling fluid cavity, as well as an even number of annular piezoelectric ceramics and an odd number of annular electrodes which are threaded on coaxial-line bolts between the front cover plate and the back cover plate, and the rotor is arranged in the center of the coupling fluid cavity through a bearing. Compared with the prior art, the liquid-medium longitudinal-vibration non-contact ultrasonic motor has the advantages of simple structure, simple and convenient control, large output torque, wide regulation range and having wide application in precision positioning drive, robot-joint drive, aerospace and other fields.

Description

technical field [0001] The invention relates to an ultrasonic motor, in particular to a liquid medium longitudinal vibration non-contact ultrasonic motor. Background technique [0002] Ultrasonic motor is a special motor that converts electrical energy into mechanical energy by using the inverse piezoelectric effect of piezoelectric ceramics. It is a new type of driver with good application prospects; The application prospect; it has been successfully applied in camera auto-focus system, robot drive mechanism, card reader and other fields. Compared with electromagnetic motors, ultrasonic motors have the following advantages: (1) low speed, high torque, and high efficiency; (2) large torque available per unit weight, and because the inertia of moving parts (rotors) can be reduced, the starting , Good stop control; (3) Due to the large torque, there is no need to use the deceleration mechanism to increase the torque, which can realize direct drive and accurate positioning; (4...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02N2/10
Inventor 彭太江伍晓宇梁雄
Owner SHENZHEN UNIV