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Ultrasonic motor driving method

A technology of ultrasonic motor and driving method, which is applied in the direction of generator/motor, electrical component, piezoelectric effect/electrostrictive or magnetostrictive motor, etc., which can solve the problem of increasing difficulty and boosting ratio of DC/DC switching circuit Increase and other problems, to achieve the effect of improving efficiency, automatic balance of input current, and simple circuit

Inactive Publication Date: 2009-04-29
BOLY MEDIA COMM SHENZHEN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the battery voltage is fixed and the input voltage amplitude of the motor increases, the boost ratio of the step-up DC / DC switching circuit increases, and the difficulty of implementation increases

Method used

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Experimental program
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Effect test

Embodiment 1

[0095] According to FIG. 3 , the ultrasonic motor of this embodiment includes a stator 31 and a rotor 33 with a central circular hole. The stator 31 is composed of a hollow cylindrical metal body on which several piezoelectric elements 32 are fixed, and the rotor 33 is composed of a revolving housing 33 embedded with an optical lens group 34 . The base body of the stator 31 and the rotor 33 are matched by threads 35, that is, the inner wall of the central circular hole of the stator 31 is provided with internal threads, and the outer surface of the rotor 33 is provided with corresponding external threads, both of which have the same pitch and nominal diameter. The shape of the stator base 31 is polyhedral or cylindrical and has a hollow inner wall. Its metal material makes the piezoelectric elements on it have a common node. The surface of the thread is wear-resistant or coated with wear-resistant materials. The cross-section of the thread can be It is a variety of forms such ...

Embodiment 2

[0099] Embodiment 2 differs from Embodiment 1 only in the circuit for driving the power supply. Such as Figure 7 shown in Figure 5b A step-up DC / DC switch circuit is added before the bridge inverter circuit shown in order to increase the supply voltage. For example, in the case of battery-powered applications, use a step-up DC / DC switching circuit to increase the voltage to a certain value.

[0100]Of course, if the power supply voltage is higher than the driving voltage required by the piezoelectric element, it can also be realized by step-down DC / DC in the same way.

Embodiment 3

[0102] The ultrasonic motor of embodiment 3 is shown in Fig. 8, and its basic structure is similar to that of Fig. 3, the only difference is that the number of piezoelectric elements is different, which is 6, so that the motor can be driven by a three-phase power supply in the following manner:

[0103] The polarization of the piezoelectric element and the wiring of its driving power are as follows: Figure 9 shown. Piezoelectric sheets 92-94, 96-98 are all positively polarized, and connected in sequence Figure 5b After the midpoint of the first bridge arm 51, the second bridge arm 52, and the third bridge arm 53 of the circuit shown, the piezoelectric sheet is excited by the three-phase power supply and forms a clockwise rotating vibration traveling wave on the stator. , the traveling wave drives the rotor to rotate through friction. In the case of screw fit between the stator and the rotor, the rotor can also move axially while rotating.

[0104] In this embodiment, the ...

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Abstract

The invention provides a driving method used for an ultrasonic motor. As for the ultrasonic motor with piezoelectric elements with the number of four or the multiple of four, when the piezoelectric elements are provided with common-ground structures, adjacent piezoelectric elements use a polarization type of ++__; the voltage increment of a three-phase bridge-typed inverter circuit is controlled so as to gain two-phase orthogonal AC voltages and to supply the power for all piezoelectric elements sequentially, thus effectively reducing the voltage amplitude of the power supply, reducing the number of the switching transistor and improving the efficiency of the driving circuit. As for the ultrasonic motor, a type of two single-polarity DC pulse voltage power supplies with the electric angle difference of 90 degrees can be used to replace the normal AC output, thus greatly improving the switching frequency of the transistor and facilitating the miniaturization and integration of the driving circuit. As for the ultrasonic motor with piezoelectric elements with the number of three or the multiple of three, voltage increment of a three-phase bridge-typed inverter circuit is controlled so as to gain three-phase symmetric AC voltages and to supply the power for all piezoelectric elements sequentially, thus effectively reducing the number of the switching transistor and improving the efficiency of the driving circuit.

Description

technical field [0001] The invention relates to a method of driving an ultrasonic motor. Background technique [0002] Ultrasonic motor is a drive mechanism obtained by combining multiple piezoelectric elements in a specific structure by using the inverse piezoelectric effect of piezoelectric materials. It is generally composed of functional components such as a stator and a rotor. Piezoelectric elements with a stretching effect. The existing ultrasonic motor is generally equipped with four (or its integer multiple) piezoelectric elements, and its drive adopts four-phase or two-phase orthogonal sinusoidal power supply, that is, method 1: sequentially add power to the four piezoelectric elements in the same group Signal sinωt, cosωt, -sinωt, -cosωt, or method 2: Connect two opposite piezoelectric elements in the same group in reverse series first, and then add the power signal sinωt and cosωt respectively, such as figure 1 As shown, a traveling wave is generated in the ultr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02N2/14
CPCH02N2/163H02N2/147H02N2/0095
Inventor 李毅彭勇胡笑平
Owner BOLY MEDIA COMM SHENZHEN
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