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A linear driver

A linear drive, consistent technology, applied in the direction of generators/motors, piezoelectric effect/electrostrictive or magnetostrictive motors, electrical components, etc., can solve the incompatibility of integrated circuit processes, complex multiple side platforms, and structural It is not easy to thin and other problems, to achieve the effect of improving output stability, simple manufacturing process and easy miniaturization

Active Publication Date: 2012-09-05
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this invention patent has the following disadvantages: 1. The structure of the stator has multiple side platforms, which are relatively complicated; 2. It requires more ceramic sheets, and the pasting is more complicated; 3. Its structure is not easy to thin and is not compatible with integrated circuit technology; 4. The structure of the motor stator of this invention is a non-axisymmetric structure, which is not suitable for generating ideal bending traveling waves

Method used

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Embodiment 1

[0036] Such as figure 2 As shown, the present invention includes a stator 4, a rotor 5 screwed to the stator 4, and an annular piezoelectric ceramic sheet 6 as an excitation element. Such as image 3 As shown, the stator 4 is made up of a circular plate 41 and a central rod. The central rod in this embodiment is a circular tube 42, and one end of the circular tube 42 is fixed at the center of the circular plate 41 and is perpendicular to the circular plate 41. The rotor 5 is connected with the internal thread of the round pipe 42 through the external thread on it, and the piezoelectric ceramic sheet 6 is pasted together with the circular plate 41 of the stator 4 . The piezoelectric ceramic sheet 6 , the circular plate 41 and the circular tube 42 constituting the stator 4 , and the rotor 5 have a common central axis 7 . The stator circular plate 41 has two spatially orthogonal out-of-plane bending vibration modes containing a pitch diameter and a pitch circle, the frequency ...

Embodiment 2

[0039] Such as Image 6 , Figure 7 As shown, in this embodiment, the annular piezoelectric ceramic sheet as the excitation element can be provided with two pieces 6, 8, and the two piezoelectric ceramic sheets 6, 8 are respectively pasted on both sides of the circular plate 41 of the stator 4. The partitions I, II, III, and IV of the electric ceramic sheets 6 and 8 are in the same circumferential position, and the rotor 5 is connected with the inner thread of the circular tube 42 of the stator 4 through external threads, and the piezoelectric ceramic sheets 6 and 8, the stator 4 and the rotor 5 have a common central axis 7 .

Embodiment 3

[0041] Such as Figure 8 As shown, in this embodiment, the stator 4 is composed of a circular plate 41 and a circular tube 42 extending from the circular plate 41 at both ends, and the rotor 5 is connected with the internal thread of the circular tube 42 inner wall of the stator 4 through external threads. The circular plate 41 , the circular tube 42 and the rotor 5 share a central axis 7 .

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Abstract

A linear driver is composed of a stator, a rotor and an excitation element. The stator is made up of a circular plate and a center rod which is fixed and perpendicular to the circular plate and is threaded connected to the rotor. The shape of the excitation element corresponds to the shape of the circular plate, and they stick together. The stator, the rotor and the excitation element have a common central axis. When the excitation element is supplied with power, it excites a vibration of the stator and then drives a threaded rotation of the rotor with respect to the stator, thus performing alinear motion of the rotor in the axial direction in the meanwhile.

Description

technical field [0001] The invention relates to a linear driver, in particular to a threaded linear driver. Background technique [0002] With the development of science, there is an urgent need for miniature linear actuators in the fields of optical focusing, precision driving and microsystems. The efficiency of the original electromagnetic drive drops sharply at the micro scale, and it is difficult to manufacture. The piezoelectric driver is a new type of driver, which uses the inverse piezoelectric effect of piezoelectric ceramics to convert small-amplitude vibrations into required motions through structural design, and has the advantages of simple structure, easy miniaturization, power-off self-locking, etc. It has broad application prospects in the above fields. [0003] Such as figure 1 As shown, it is a threaded rod ultrasonic motor disclosed in the US 6,940,209B2 invention patent, which includes a multi-faceted pipe body 1 with a central hole, a threaded rod 2, an...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02N2/02
CPCH02N2/0095H02N2/02
Inventor 褚祥诚季叶马龙李龙土
Owner TSINGHUA UNIV
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