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Method for calculating torque and rotating speed characteristics of annular traveling wave ultrasonic motor based on dynamic friction force

An ultrasonic motor, torque speed technology, applied in generator/motor, piezoelectric effect/electrostrictive or magnetostrictive motor, electrical components, etc., can solve the problem of difficulty in calculating torque and speed characteristics of ultrasonic motor, etc. Achieve the effect of improving torque and speed performance and strong adaptability

Pending Publication Date: 2022-04-19
NANJING INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the complex nonlinear problems involved in contact and friction, it is difficult to calculate the torque and speed characteristics of ultrasonic motors

Method used

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  • Method for calculating torque and rotating speed characteristics of annular traveling wave ultrasonic motor based on dynamic friction force
  • Method for calculating torque and rotating speed characteristics of annular traveling wave ultrasonic motor based on dynamic friction force
  • Method for calculating torque and rotating speed characteristics of annular traveling wave ultrasonic motor based on dynamic friction force

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Experimental program
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Effect test

Embodiment 1

[0054] Such as figure 1 As shown, a method for calculating the torque and speed characteristics of an annular traveling wave ultrasonic motor based on dynamic friction includes the following steps:

[0055] Step 1: Obtain the basic parameters of the ring traveling wave ultrasonic motor.

[0056] The basic parameters of the ring traveling wave ultrasonic motor include: the elastic modulus E of the friction material, the friction coefficient μ, the stator amplitude A, the stator vibration frequency f, the peak number n of the stator working mode, and the pre-pressure F between the stator and the rotor n , the average contact radius of the stator and rotor r, the radial contact width of the stator and rotor b, the thickness of the friction material h, the distance a from the stator tooth surface to the neutral plane, and the stiffness coefficient σ per unit area of ​​the stator and rotor contact interface.

[0057] Step 2: Calculate contact start time t 1 , calculated by the fo...

Embodiment 2

[0085] This embodiment is based on the specific application scenario of the calculation method for the torque and speed characteristics of the annular traveling wave ultrasonic motor based on dynamic friction provided by Embodiment 1. The following embodiments are only used to illustrate the technical solution of the present invention more clearly, and cannot In this way, the protection scope of the present invention is limited.

[0086] Taking a circular traveling wave ultrasonic motor with a diameter of 60mm as an example, combined with figure 1 Each step is described in detail.

[0087] Step 1: Obtain the basic parameters of the ring traveling wave ultrasonic motor.

[0088] The basic parameters of the annular traveling wave ultrasonic motor are: the elastic modulus E of the friction material = 6.67×10 8 N / m 2 , friction coefficient μ=0.14, stator amplitude A=2μm, stator vibration frequency f=41kHz, number of crests in stator working mode n=9, pre-pressure F between stat...

Embodiment 3

[0113] Embodiments of the present invention provide a calculation system for the torque and speed characteristics of an annular traveling wave ultrasonic motor based on dynamic friction, including:

[0114] Obtaining module: used to obtain the basic parameters of the annular traveling wave ultrasonic motor;

[0115] The first calculation module: used to obtain the dynamic friction stress equation of the stator and rotor based on the basic parameters of the annular traveling wave ultrasonic motor and the value of the preset rotor speed N;

[0116] The second calculation module: used to calculate the motor output torque T corresponding to the rotor speed N according to the dynamic friction stress equation of the stator and rotor L ;

[0117] Judgment module: used to judge the motor output torque T corresponding to the rotor speed N L size, if T L >0, reset the value of the rotor speed N and calculate the motor output torque T corresponding to the rotor speed N L ; if T L ≤0...

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Abstract

The invention discloses a method for calculating torque and rotating speed characteristics of an annular traveling wave ultrasonic motor based on dynamic friction force. The method comprises the following steps: acquiring basic parameters of the annular traveling wave ultrasonic motor; obtaining a stator-rotor dynamic friction stress equation based on the basic parameters of the annular traveling wave type ultrasonic motor and a preset rotor rotating speed N value; calculating a motor output torque TL corresponding to the rotor rotating speed N according to a stator and rotor dynamic friction stress equation; judging the size of a motor output torque TL corresponding to the rotor rotating speed N, and if TL is greater than 0, resetting the value of the rotor rotating speed N and calculating the motor output torque TL corresponding to the rotor rotating speed N; if TL is less than or equal to 0, ending calculation; and determining the torque and rotating speed characteristics of the annular traveling wave type ultrasonic motor according to all rotor rotating speeds N and the corresponding motor output torques TL in the calculation process. According to the method, the torque and rotating speed characteristics of the motor can be effectively calculated in the design analysis stage of the annular traveling wave ultrasonic motor.

Description

technical field [0001] The invention relates to a calculation method for torque and speed characteristics of an annular traveling wave ultrasonic motor based on dynamic friction, and belongs to the technical field of ultrasonic motors. Background technique [0002] Ultrasonic motors use the inverse piezoelectric effect of piezoelectric ceramics to convert high-frequency alternating current into ultrasonic vibrations of metal elastomers, and then convert the ultrasonic vibrations of metal elastomers into rotation or linear motion of rotors or movers through contact friction. Ultrasonic motors have many advantages, such as low-speed high-torque, power-off self-locking, fast dynamic response, etc. Ring traveling wave ultrasonic motors are one of the most common types of ultrasonic motors. [0003] Torque and speed characteristics are one of the important properties of ultrasonic motors. Due to the complex nonlinear problems involved in contact and friction, it is difficult to...

Claims

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Application Information

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IPC IPC(8): H02N2/14H02N2/16H02N2/12H02N2/00
CPCH02N2/14H02N2/163H02N2/12H02N2/0065H02N2/007
Inventor 蒋春容赵子龙张津杨陆旦宏
Owner NANJING INST OF TECH