Model parameter identification method for limited angle electromechanical servo system

A technology of electromechanical servo system and identification method, which is applied in the field of model parameter identification of limited rotation angle electromechanical servo system, can solve the problems of large rotation angle of electromechanical servo system, position drift of electromechanical servo system, mechanical structure damage, etc., to achieve convenient design, Simple structure, high real-time effect

Active Publication Date: 2018-07-13
HARBIN INST OF TECH
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the existing open-loop frequency sweep measurement method due to the nonlinear factors and the influence of the steady-state component of the sinusoidal response, which causes the electromechanical servo system to have position drift and direction

Method used

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  • Model parameter identification method for limited angle electromechanical servo system
  • Model parameter identification method for limited angle electromechanical servo system
  • Model parameter identification method for limited angle electromechanical servo system

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Example Embodiment

[0021] Specific implementation manner 1: The specific process of a model parameter identification method of a limited-angle electromechanical servo system of this embodiment is:

[0022] The present invention mainly aims at the problem of position drift, uncertain direction, and possible exceeding limit when the electromechanical servo system with limited rotation angle performs open-loop sine frequency sweeping to obtain model parameters, so a limited rotation angle is proposed. Model parameter identification method of electromechanical servo system.

[0023] Step 1. Establish the mechanism model of the electromechanical servo system according to the structure of the electromechanical servo system, namely the open loop transfer function model G(s) of the electromechanical servo system;

[0024] Step 2: In the closed loop state of the electromechanical servo system, the input signal amplitude is A r 、Sine signal with frequency f, use correlation identification method to obtain the ac...

Example Embodiment

[0032] Specific embodiment two: This embodiment is different from the specific embodiment one in that the step one is based on the structure of the electromechanical servo system ( figure 1 ) Establish the mechanism model of the electromechanical servo system, namely the open-loop transfer function model G(s) of the electromechanical servo system; the specific process is:

[0033] The mechanism model of the electromechanical servo system is:

[0034]

[0035] Where i d ,i q Is the direct axis current and quadrature axis current in the synchronously rotating d-q coordinate system, d is the direct axis, and q is the quadrature axis; ω r Is the mechanical angular velocity of the motor; r e Is the motor equivalent resistance; L is the motor armature inductance; J X Is the total moment of inertia of the shaft system; D is the friction coefficient when the motor is rotating; T l Is the disturbance torque, including friction torque and wave dynamic torque; P m Is the number of motor pole ...

Example Embodiment

[0060] Specific embodiment three: this embodiment is different from specific embodiment one or two in that in the second step, in the closed loop state of the electromechanical servo system, the input signal amplitude is A r 、Sine signal with frequency f, use correlation identification method to obtain the actual control signal amplitude A at this frequency point u ;

[0061] The specific process is:

[0062] A simple proportional controller is designed to operate the electromechanical servo system in a closed loop. Under the premise of ensuring the stability of the system, the structure and control accuracy of the controller do not affect the subsequent steps of the present invention.

[0063] Although theoretically it can control the actual control signal amplitude A at the frequency point f u Perform calculations, but when the system is closed-loop, the input of the closed-loop controller becomes the deviation between the input signal r and the actual position θ, so the actual cont...

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Abstract

The invention relates to a model parameter identification method for a limited angle electromechanical servo system, aiming to solve the problem that due to drifting and uncertain direction in motionof the electromechanical servo system during application of an open-loop frequency scanning measurement method, the electromechanical servo system may rotate at a big angle to be out of a position limit to cause damages to its mechanical structure. The method includes the steps of 1, creating a mechanism model of the electromechanical servo system; 2, acquiring actual control signal amplitude; 3,calculating compensation signal amplitude; 4, changing input signal amplitude; 5, repeating the step 2 to 4 until acquiring an ideal control signal amplitude, and acquiring amplitude-phase characteristics of frequency points; 6, changing input signal frequency, repeating the step 2 to 5 until acquiring the amplitude-phase characteristics of various frequency points within a band as required; 7, acquiring the model parameters of the electromechanical servo system. The model parameter identification method is applied to the field of model parameter identification of the electromechanical servo system.

Description

technical field [0001] The invention relates to a model parameter identification method of a limited rotation angle electromechanical servo system. Background technique [0002] With the increase of motor types and the improvement of manufacturing level, the motor is not only used as a simple power output device to serve production. Today, with the continuous improvement of power electronics and control science, the high-performance control of the motor can be used for precision machining, High-precision field services such as automatic control and dynamic tracking. This not only promotes the development of motor manufacturing technology, but also provides a broad stage for the research of mechatronics control. For high-performance electromechanical control systems, it is usually necessary to establish a negative feedback loop so that the motor output tracks the reference input signal, and the motor is precisely controlled by this method. Such electromechanical control sys...

Claims

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Application Information

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IPC IPC(8): G05B13/04
CPCG05B13/042
Inventor 陈松林吴金书邢宝祥王玘玥刘刚王博
Owner HARBIN INST OF TECH
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