Method for exciting rotary ultrasonic motor

An ultrasonic motor and excitation technology, applied in the direction of generators/motors, piezoelectric effect/electrostrictive or magnetostrictive motors, electrical components, etc., can solve the problem of harmonic excitation derivation and cannot be used for guidance Ultrasonic motor high-efficiency excitation design and other issues to achieve the effect of improving stability and operating efficiency

Active Publication Date: 2011-08-03
TIANJIN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] 2. The existing technology only gives the matching relationship between the number of piezoelectric sheets and the wave number, but has not studied the influence of the excitation mode on the dynamic characteristics. Usually, the relationship between the number of piezoelectric sheets and the wav...

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  • Method for exciting rotary ultrasonic motor
  • Method for exciting rotary ultrasonic motor
  • Method for exciting rotary ultrasonic motor

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Embodiment Construction

[0024] In order to make the object, technical solution and advantages of the present invention clearer, the implementation manner of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0025] In order to determine the matching between the number of piezoelectric sheets and the wave number, and to guide the design of high-efficiency excitation of the rotating ultrasonic motor, it is necessary to consider harmonic excitation and its derivatives, thereby meeting the actual needs of the project. Embodiments of the present invention provide a rotating Vibration method of ultrasonic motor. In order to simplify the problem, the embodiment of the present invention assumes that each piezoelectric piece is excited by a sine-cosine signal, and takes a cylindrical rotating ultrasonic motor as an example to reveal the mapping between the number of piezoelectric pieces, wave number, and energization sequence and the excitation effe...

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Abstract

The invention discloses a method for exciting a rotary ultrasonic motor and relates to the field of the ultrasonic motors. The method comprises the following steps of determining the number of piezoelectric slices in each group, the group number of the piezoelectric slices, the number of operating waves and a physical included angle between adjacent groups of piezoelectric slices when the total number of the piezoelectric slices is fixed; for the rotary ultrasonic motor which is uniformly provided with the piezoelectric slices, estimating a first exciting effect by using a first formula so as to obtain a first basic parameter combination for ensuring the first exciting effect to be maximized; for the rotary ultrasonic motor with the grouped piezoelectric slices, estimating a second exciting effect by a second formula and a third formula so as to obtain a second basic parameter combination for ensuring the second exciting effect to be maximized; calculating an excitation response generated by harmonic excitation; and if standing waves or backward waves do not exist near a working point, using the first basic parameter combination or the second basic parameter combination as a final scheme. The method helps to improve the operation stability and the efficiency of the ultrasonic motor.

Description

technical field [0001] The invention relates to the field of ultrasonic motors, in particular to an excitation method for a rotating ultrasonic motor. Background technique [0002] The rotary ultrasonic motor is a new mechatronic direct drive device with great vitality, which has many advantages that the magnetic field motor cannot match. In the past two decades, considerable progress has been made in the research on rotating ultrasonic motors, including the construction of new motors and the design of new driving principles. But its lifetime, efficiency and stability issues are still not well resolved. [0003] Traditional rotary ultrasonic motors are mostly driven by two phases. Existing studies have shown that if three-phase or even multi-phase excitation is used, traveling waves can still be excited on the stator [1]. However, literature [2] pointed out that since the disk vibrator only has two resonant modes, the three-phase excitation cannot produce a stable rotatio...

Claims

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Application Information

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IPC IPC(8): H02N2/14
Inventor 王世宇陈东亮霍咪娜张东升王建
Owner TIANJIN UNIV
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