Square plate linear ultrasonic motor and electric exciting manner

An ultrasonic motor, linear technology, applied in the direction of generator/motor, piezoelectric effect/electrostrictive or magnetostrictive motor, electrical components, etc. Not high, frequency consistency is not easy to ensure and other problems, to achieve the effect of easy frequency consistency, compact structure and large torque

Inactive Publication Date: 2007-11-14
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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AI Technical Summary

Problems solved by technology

When designing and processing the first type of linear motor, it is difficult to control the frequency consistency of the two modes; when processing the second type of linear ultrasonic motor, it is not easy to ensure the frequency consistency of the two vibrators
The two types of linear motors only drive the mover for a short period of time in each vibration cycle, and the driving efficiency is not high

Method used

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  • Square plate linear ultrasonic motor and electric exciting manner
  • Square plate linear ultrasonic motor and electric exciting manner
  • Square plate linear ultrasonic motor and electric exciting manner

Examples

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Embodiment Construction

[0014] A linear motion ultrasonic motor is shown in Figure 2, and its stator is shown in Figure 1. Its characteristics: the stator is composed of a square metal plate 5 with four convex teeth 1, 2, 3, 4, and four pieces of piezoelectric ceramics 6, 7, 8, 9 are pasted on the back of the plate correspondingly to excite the stator Bending vibration of plate 5. As shown in Figure 3, wherein, piezoelectric ceramics 7, 8 are used to excite the second-order bending vibration mode 12 of the stator plate shown in Figure 2 in the x-z section; piezoelectric ceramics 6, 9 are used to excite the stator plate shown in Figure 2 The second-order bending vibration mode 13 of the stator plate in the y-z section is shown. Convex teeth 2 and 3 are located at the peak of the second-order bending vibration mode 13, and convex teeth 1 and 4 are located at the valley of the second-order bending vibration mode 13; convex teeth 1 and 2 are located at the valley of the second-order bending vibration mo...

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Abstract

The motor includes stator, mover and piezoelectric ceramics. The stator is a quadrate plate. There are four dogteeth on one face of the plate; and there are pieces of piezoelectric ceramics pasted on the other face of the plate. The pieces of piezoelectric ceramics are in use for exciting 2-ordered bending vibration mode of the plate. Using sinusoidal signals with pi /2 phase difference excites two inter orthogonal 2-ordered bending vibrations of the stator plate so that four dogteeth on the plate generate elliptic motions with pi /2 phase difference. The elliptic motions through friction drive motions of mover pressed on dogteeth on the plate. When using sinusoidal signals with - pi /2 phase difference generates excitation, the invention makes motions of mover in inverse direction. Under working state, there are nine nodes on surface of the stator plate, and the three nodes are as supporting points for stator. Features are: compact structure, high driving efficiency, larger thrust force, and reliable operation.

Description

1. Technical field: [0001] The square-plate linear ultrasonic motor and the electric excitation method of the present invention belong to the field of ultrasonic motors. 2. Background technology: [0002] Ultrasonic motor is a new type of power output device that utilizes the inverse piezoelectric effect of piezoelectric ceramics and ultrasonic vibration. Among them, the linear motion ultrasonic motor is a kind of ultrasonic motor. At present, linear ultrasonic motors can be divided into two types: the first type uses two different vibration modes in two orthogonal directions to synthesize the elliptical motion of the driving end to push the mover, such as the first-order longitudinal vibration mode of a rectangular plate and The second-order bending vibration mode synthesizes the elliptical motion of the driving end; the second type uses the same vibration mode of two vibrators to synthesize the elliptical motion, such as a V-shaped linear ultrasonic motor using two mutual...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02N2/02H02N2/04H02N2/06
Inventor 赵淳生金家楣
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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