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Motion precision prediction method for direct-drive high-speed feed system with consideration of thrust harmonic characteristics

A motion precision and feed system technology, applied in general control systems, control/regulation systems, complex mathematical operations, etc., can solve the time-consuming problems of thrust harmonic analysis and calculation methods

Inactive Publication Date: 2019-10-08
XI AN JIAOTONG UNIV
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Problems solved by technology

[0004] The purpose of the present invention is to provide a method for predicting motion accuracy of a direct-drive high-speed feed system considering the characteristics of thrust harmonics, which solves the problems of time-consuming and difficult analysis and calculation methods for thrust harmonics of direct-drive high-speed feed systems in the prior art. Fast and effective analysis of sensitive parameters affected by thrust harmonics

Method used

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  • Motion precision prediction method for direct-drive high-speed feed system with consideration of thrust harmonic characteristics
  • Motion precision prediction method for direct-drive high-speed feed system with consideration of thrust harmonic characteristics
  • Motion precision prediction method for direct-drive high-speed feed system with consideration of thrust harmonic characteristics

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Embodiment

[0051] In this embodiment, a single-axis feed test bench equipped with a direct drive feed system is selected. The maximum feed speed of the test bench is 30m / min, and the maximum acceleration is 1g. Specific steps are as follows:

[0052] Step 1: Establish a direct-drive high-speed feed system motion accuracy analysis model considering the thrust harmonic characteristics, as shown in the attached figure 1 As shown, it specifically includes position loop, speed loop, current loop, linear motor, drive components and feedback components, among which, the position loop adopts proportional control; the speed loop adopts proportional integral control; the current loop is equivalent to proportional gain; the linear motor generates Thrust harmonics are introduced into the model in the form of interference; the mechanical system is equivalent to a single inertia system, and the closed-loop feedback loop gain is 1.

[0053] According to the established motion precision analysis model,...

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Abstract

The invention provides a motion precision prediction method for a direct-drive high-speed feed system with consideration of thrust harmonic characteristics. The method comprises the following steps: step one, according to a motion precision analysis model of a direct-drive high-speed feed system considering thrust harmonic characteristics, acquiring a system interference transfer function; step two, extracting a characteristic equation according to the system interference transfer function obtained in the step one; step three, introducing actual system parameters into the characteristic equation obtained in the step two to obtain a root of the characteristic equation and determining the root of the characteristic equation; step four, on the basis of the determination result in the step three, carrying out inverse laplace transformation by using the system interference transfer function Gr(s) obtained in the step one to obtain system motion precision under the single thrust harmonic action; and step five, repeating the step four to obtain the motion precision of the direct-drive high-speed feed system under all thrust harmonics. According to the invention, the linear motor thrust fluctuation problem in the conventional analysis is extended to the motion accuracy of the final feed system; and thus the method has the important guidance significance in evaluating the influence degree of the thrust fluctuation phenomenon of the linear motor in the actual CNC machine tool.

Description

technical field [0001] The invention belongs to the field of motor drive and control, and in particular relates to a method for predicting motion accuracy of a direct-drive high-speed feed system in consideration of thrust harmonic characteristics, which is suitable for occasions such as high-speed high-precision numerical control machine tools. Background technique [0002] The permanent magnet synchronous linear motor feed system realizes zero feed transmission. Compared with the traditional ball screw feed system, it has the advantages of large thrust, high speed and good precision. It has a wide range of applications in many fields such as high-speed high-precision CNC machine tools. Application prospect. However, the zero-gear structure also has many disadvantages, the most prominent of which is the thrust fluctuation caused by the non-linearity of the drive circuit and the motor structure. Aiming at thrust fluctuation, scholars at home and abroad have carried out a lo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05B19/19G06F17/11
CPCG05B19/19G05B2219/35349G06F17/11
Inventor 杨晓君赵万华刘辉张俊吕盾权力
Owner XI AN JIAOTONG UNIV
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