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Composite ultrasonic micromotor with slotted metal square column piezoelectric sheet

A technology of composite ultrasonic and piezoelectric sheets, applied in piezoelectric effect/electrostrictive or magnetostrictive motors, generators/motors, electrical components, etc. Small bending amplitude and other problems, to achieve the effect of reducing stiffness, increasing bending amplitude, and promoting miniaturization

Inactive Publication Date: 2005-09-14
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the structural size of the actuator or motor is small, the bending amplitude of the vibrator is also small, which cannot effectively drive
In order to increase the bending amplitude, the diameter of the metal body must be reduced, which also reduces the size of the chip ceramics and reduces the output torque / force

Method used

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  • Composite ultrasonic micromotor with slotted metal square column piezoelectric sheet
  • Composite ultrasonic micromotor with slotted metal square column piezoelectric sheet
  • Composite ultrasonic micromotor with slotted metal square column piezoelectric sheet

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] Embodiment 1: A micro-motor with a double-ended shaft output structure

[0055] The structure of this embodiment is as Image 6 As shown, its main features are double-ended drive and shaft output, that is, a matching block 63 is pasted on both ends of the metal piezoelectric ceramic composite square column 64 to form a stator, and 66 is a thin layer of glue for pasting the stator 64 and the matching block 63 . The rotors 62 at both ends are connected together by a shaft 68 passing through the hollow stator, a spring 61 sleeved on the shaft 68 and a fastening nut 67 . Springs are used to provide preload between the stator and rotor. The stator drives the rotor 62 to rotate through the friction layer 65 . The torque is directly output by the rotor. In actual use, the outer edge of the rotor 62 can be processed into a gear, and the torque can be output through gear transmission.

Embodiment 2

[0056] Embodiment 2 is a micro-motor with a single-ended shaft output structure

[0057] The structure is as Figure 7 As shown, its main feature is that a thin rod is integrally processed (or fixed) in the middle of the stator matching block 73 as the fixed shaft 77 of the motor. The shaft and the stator matching block can be the same metal piece. The metal piezoceramic sheet composite square column 74 and the matching block 73 are glued at 76, and together serve as the stator of the motor. The rotor 72 is sleeved on the fixed shaft 77 of the stator matching block 73 and a small spring 71 sleeved on the fixed shaft 77 provides a pre-pressure between the stator and the rotor. In this motor, the main function played by the shaft 77 is to locate the rotor 72 and the small pressure spring 71 . 78 is a sliding or rolling bearing. The torque is directly output by the rotor. In actual use, the outer edge of the rotor can be processed into a gear, and the torque can be output thr...

Embodiment 3

[0058] Embodiment three is the micromotor of magnetic force positioning structure

[0059] The structure is as Figure 8 As shown, its main feature is that the rotor is made of magnetic steel balls 81, the metal piezoelectric ceramic sheet composite square column 83 and the concave magnetic metal matching block 82 are bonded together with superglue to form a motor stator. The magnetic steel ball rotor is placed in the concave surface of the metal matching block 82 . In this way, the magnetic force between the rotor and the metal matching block 82 is used as the required preload for fixing the rotor and generating friction, and the torque is directly output by the rotor.

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PUM

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Abstract

This invention relates to a metal square post piezoelectric compound supersonic micro-machine composed of a stator exciting vibration of supersonic sound, a rotor outputting moment or a runner and a pre-pressure unit pressing the rotor or the runner characterizing that said stator is mainly composed of a metal piezoelectric ceramic compound square post and matched blocks comprising a metal square post exciting vibration and piezoelectric ceramic plates, four slots are opened axially at the four edge angles of the post, said plates are adhered on the two or four side faces of the post polarized along the thickness direction, the surface of the plate connected with excited electrode is coated with outer electrodes for polarization and excitation.

Description

technical field [0001] The invention belongs to the field of ultrasonic application, in particular to a structure design of a miniaturized ultrasonic motor. Background technique [0002] The piezoelectric ultrasonic motor is a driving mechanism made of a specific structure using the inverse piezoelectric effect of piezoelectric materials. It is generally composed of functional components such as a stator, a rotor, and a pre-pressure mechanism. It uses the inverse piezoelectric effect of piezoelectric ceramics to generate ultrasonic vibrations on the surface of the stator, and the friction between the stator and the rotor drives the rotor to move. Ultrasonic motors have the following advantages over ordinary electromagnetic motors: [0003] 1. Low speed, high torque, can directly drive the load without deceleration mechanism; [0004] 2. Small size, flexible structure, power volume ratio is 3-10 times that of electromagnetic motor; [0005] 3. Quick start and stop response...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02N2/00
Inventor 周铁英鹿存跃陈宇
Owner TSINGHUA UNIV
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