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Method for calculating torque and rotating speed characteristics of annular traveling wave type ultrasonic motor considering stator tooth structure

An ultrasonic motor, torque speed technology, applied in the direction of piezoelectric effect/electrostrictive or magnetostrictive motor, generator/motor, electrical components, etc., can solve the error, stator and rotor contact and friction problems complex, increase Great difficulty and other problems, to achieve the effect of strong adaptability, improved torque speed performance, and simple calculation process

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

The stator tooth structure makes the contact and friction problems of the stator and rotor more complicated, which increases the difficulty of accurately calculating the torque and speed characteristics of the motor
The simplification method is to ignore the structure of the stator teeth and directly regard the surface of the stator as continuous, but this simplification method often brings large errors

Method used

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  • Method for calculating torque and rotating speed characteristics of annular traveling wave type ultrasonic motor considering stator tooth structure
  • Method for calculating torque and rotating speed characteristics of annular traveling wave type ultrasonic motor considering stator tooth structure
  • Method for calculating torque and rotating speed characteristics of annular traveling wave type ultrasonic motor considering stator tooth structure

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Experimental program
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Embodiment 1

[0047] like figure 1 As shown, a calculation method for the torque and speed characteristics of an annular traveling wave ultrasonic motor considering the stator tooth structure includes:

[0048] Step 1: Obtain the basic parameters of the ring traveling wave ultrasonic motor.

[0049] 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 surface of the stator teeth to the neutral plane.

[0050] Step 2: Obtain the structural parameters of the stator teeth.

[0051] The structural parameters of the stator teeth, including: the number of stator teeth n...

Embodiment 2

[0076] This embodiment is based on the specific application scenario of the calculation method of the torque and speed characteristics of the annular traveling wave ultrasonic motor considering the stator tooth structure provided by the first embodiment. The following embodiments are only used to illustrate the technical solution of the present invention more clearly, and The protection scope of the present invention cannot be limited by this.

[0077] 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.

[0078] Step 1: Obtain the basic parameters of the ring traveling wave ultrasonic motor.

[0079] 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...

Embodiment 3

[0095] An embodiment of the present invention provides a calculation system for the torque and speed characteristics of an annular traveling wave ultrasonic motor considering the stator tooth structure, including:

[0096] Obtaining module: used to obtain the basic parameters of the annular traveling wave ultrasonic motor and the structural parameters of the stator teeth;

[0097] Calculation module: used to calculate the motor output torque T corresponding to the rotor speed N based on the basic parameters of the annular traveling wave ultrasonic motor, the structural parameters of the stator teeth and the preset value of the rotor speed N L ;

[0098] 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, end calculation;

[0099] Torque and speed characteristics confirmation module: used f...

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Abstract

The invention discloses a method for calculating torque and rotating speed characteristics of an annular traveling wave type ultrasonic motor considering a stator tooth structure, and the method comprises the steps: obtaining basic parameters of the annular traveling wave type ultrasonic motor and structural parameters of stator teeth, and calculating a motor output torque TL corresponding to a rotor rotating speed N; 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 structural parameters of the stator teeth are considered, simple and effective torque and rotating speed characteristic calculation of the annular traveling wave type ultrasonic motor can be realized, and the torque and rotating speed characteristic of the annular traveling wave type ultrasonic motor can be calculated in the design analysis stage of the motor.

Description

technical field [0001] The invention relates to a calculation method for the torque and speed characteristics of an annular traveling wave ultrasonic motor considering the stator tooth structure, and belongs to the technical field of ultrasonic motors. Background technique [0002] The ring traveling wave ultrasonic motor uses the inverse piezoelectric effect of piezoelectric ceramics to convert high-frequency alternating current into ultrasonic vibration of the metal elastic body, and then converts the ultrasonic vibration of the metal elastic body into the rotational motion of the rotor through contact friction. Ultrasonic motors have many advantages, such as low-speed high-torque, power-off self-locking, fast dynamic response, etc., and have broad application prospects in the fields of discontinuous motion, precision control, and intelligent robots. [0003] Torque and speed characteristics are one of the important properties of ultrasonic motors. Due to the complex nonl...

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 张津杨蒋春容陆旦宏
Owner NANJING INST OF TECH