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

An ultrasonic motor, torque speed technology, applied in the direction of generator/motor, piezoelectric effect/electrostrictive or magnetostrictive motor, electrical components, etc., can solve the problem of increasing difficulty, error, stator and rotor contact and friction Complicated problems and other problems, to achieve the effect of improving torque 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

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

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Experimental program
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Embodiment 1

[0056] Such as figure 1 As shown, a calculation method for the torque and speed characteristics of the annular traveling wave ultrasonic motor considering the stator tooth structure and dynamic friction force includes the following steps:

[0057] Step 1: Obtain the basic parameters of the ring traveling wave ultrasonic motor.

[0058] 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.

[0059] Step 2: Obtain the stru...

Embodiment 2

[0087] 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 based on the stator tooth structure and dynamic friction provided by the first embodiment. The following embodiments are only used to more clearly illustrate the technology of the present invention scheme, but should not be used to limit the scope of protection of the present invention.

[0088] 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.

[0089] Step 1: Obtain the basic parameters of the ring traveling wave ultrasonic motor.

[0090] 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 ...

Embodiment 3

[0117] Embodiments of the present invention provide a calculation system for the torque and speed characteristics of an annular traveling wave ultrasonic motor based on the stator tooth structure and dynamic friction, including:

[0118] Obtaining module: used to obtain the basic parameters of the annular traveling wave ultrasonic motor and the structural parameters of the stator teeth;

[0119] The first calculation module: used to calculate the contact start time based on the obtained basic parameters and structural parameters;

[0120] The second calculation module: used to obtain the stator-rotor dynamic friction stress equation based on the obtained basic parameters, the calculated contact start time and the preset value of the rotor speed N;

[0121] The third 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 ;

[0122] Judgment module: used to j...

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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 a stator tooth structure and dynamic friction force. The method comprises the following steps: acquiring basic parameters of the annular traveling wave ultrasonic motor and structural parameters of stator teeth; calculating contact starting time; based on the basic parameters, the contact starting time and a preset rotor rotating speed N value, a stator and rotor dynamic friction stress equation is obtained; calculating a motor output torque TL corresponding to the rotating speed N of the rotor; judging the size of a motor output torque TL corresponding to the rotor rotating speed N, resetting the value of the rotor rotating speed N and calculating the motor output torque TL corresponding to the rotor rotating speed N when TL is greater than 0; if TL < = 0, ending calculation; and according to all the rotor rotating speeds N and the corresponding motor output torques TL, the torque rotating speed characteristics of the annular traveling wave type ultrasonic motor are determined. 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 a stator tooth structure and 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] Ultrasonic motors use the inverse piezoelectric effect of piezoelectric ceramics to convert high-frequency alternating current into ultrasonic vibrations...

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